WO2019151375A1 - Electric power conversion apparatus and method for manufacturing self-excited vibration heat pipe - Google Patents

Electric power conversion apparatus and method for manufacturing self-excited vibration heat pipe Download PDF

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Publication number
WO2019151375A1
WO2019151375A1 PCT/JP2019/003306 JP2019003306W WO2019151375A1 WO 2019151375 A1 WO2019151375 A1 WO 2019151375A1 JP 2019003306 W JP2019003306 W JP 2019003306W WO 2019151375 A1 WO2019151375 A1 WO 2019151375A1
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WO
WIPO (PCT)
Prior art keywords
self
heat pipe
excited vibration
vibration heat
flow paths
Prior art date
Application number
PCT/JP2019/003306
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French (fr)
Japanese (ja)
Inventor
史花 鍋島
西原　淳夫
陽介 安田
秀一 寺門
秋山　悟
Original Assignee
株式会社日立製作所
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Priority to JP2019569211A priority Critical patent/JP7010974B2/en
Publication of WO2019151375A1 publication Critical patent/WO2019151375A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
    • B60L9/18—Electric propulsion with power supply external to the vehicle using ac induction motors fed from dc supply lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
    • H01L23/427—Cooling by change of state, e.g. use of heat pipes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating

Definitions

  • the present invention relates to a power conversion device to which a self-excited vibration heat pipe is applied and a method for manufacturing the self-excited vibration heat pipe, and is suitable as a power conversion device for a railway vehicle.
  • the self-excited oscillating heat pipe is generally constituted by a fine stroke meandering flow path in the order of mm, and the working fluid is sealed in a state in which liquid columns and air columns are alternately present due to surface tension.
  • a plurality of heat receiving portions (high temperature portions) and heat radiating portions (low temperature portions) are alternately provided in the flow path, and the liquid column is formed by pressure increase due to bumping at the heat receiving portions and pressure decrease due to condensation at the heat radiating portions.
  • the air column vibrates itself and transports heat.
  • Patent Document 1 discloses a structure in which pore groups of a porous flat tube are connected to each other at portions close to both ends, and the flat tube is reshaped so as to meander a high temperature portion and a low temperature portion many times. A self-excited vibration heat pipe is described.
  • the inventor of the present application diligently studied the application of the self-excited vibration heat pipe to the cooling device for a railway vehicle power converter, and as a result, the following knowledge was obtained.
  • the power conversion device for controlling the electric motor that drives the railway vehicle is generally installed under the floor of the railway vehicle, and the cooling device for the power conversion device is also installed under the floor similarly.
  • Railcars are not only expected to be used in various environments because they travel outdoors, but are also more strongly affected by external temperature changes due to speed changes. For this reason, the cooling device for a railway vehicle power converter is required to operate in various environments.
  • the self-excited vibration heat pipe since the self-excited vibration heat pipe has a tendency that the gravity dependency becomes smaller as the number of heat receiving portions and heat radiating portions in contact with the flow path is larger, a one-stroke serpentine flow path structure is generally adopted.
  • a structure having a long flow path length such as a one-stroke serpentine flow path structure, faces the following problems when applied to a railway vehicle.
  • the self-excited vibration heat pipe transports heat by moving the hydraulic fluid by self-excited vibration. Therefore, if the movement resistance of the hydraulic fluid is large, the hydraulic fluid is difficult to vibrate and the cooling performance is deteriorated.
  • the magnitude of this movement resistance depends on, for example, the viscosity of the hydraulic fluid.
  • the viscosity of the hydraulic fluid tends to increase as the temperature decreases, the cooling performance of the self-excited vibration heat pipe decreases in a low temperature environment. Or, there is a concern that the self-excited vibration heat pipe stops operating.
  • the one-stroke serpentine flow path structure described in Patent Document 1 is likely to be affected by viscosity in a low temperature environment because of the long flow path length, and there is a concern that the usable temperature range is not sufficient.
  • the self-excited vibration heat pipe tends to make it difficult for bubbles to vibrate when the calorific value is small.
  • the power conversion device for a railway vehicle generally generates a large amount of heat when the motor is driven, but there is a state where the amount of heat generated is small without driving the motor such as during coasting. large.
  • the flow path length of the self-excited vibration heat pipe is designed to be long by assuming only the maximum heat generation amount, or when the flow path is provided with a branch, the performance with a low heat generation amount that increases the viscosity of the working fluid May decrease.
  • An object of the present invention is to expand the usable temperature range as a cooling device including a self-excited vibration heat pipe used for a moving body such as a railway vehicle, and to deteriorate performance when a hole is suddenly opened in a flow path. Is to improve reliability.
  • a power conversion device includes a semiconductor element that constitutes a power conversion circuit and a cooling device that cools heat generated from the semiconductor element.
  • the cooling device includes a self-excited vibration heat pipe, and the self-excited vibration heat pipe. Has a plurality of sealed flow paths arranged in parallel.
  • the present invention even in a low-temperature environment in which the viscosity of the hydraulic fluid increases, it is possible to extend the usable temperature range as a cooling device including a self-excited vibration heat pipe while suppressing the movement resistance of the hydraulic fluid. .
  • the cooling performance is reduced by minimizing the damage only to the damaged flow path and allowing the rest to operate as a self-excited vibration heat pipe. Can be minimized.
  • FIG. Sectional drawing which looked at the cooling device of the power converter device in Example 1 from the advancing direction of the railway vehicle.
  • FIG. FIG. 5 is a cross-sectional view taken along line AA in FIG. 4, showing a cross-sectional structure of a self-excited vibration heat pipe provided in the power conversion device in the first embodiment.
  • the perspective view which shows the structure in the Example 1 when the self-excited vibration heat pipe meanders so that a heat receiving part and a thermal radiation part may reciprocate alternately.
  • FIG. 9 is a cross-sectional view taken along line BB in FIG. 8 showing the fourth and fifth steps of the method for manufacturing the self-excited vibration heat pipe mounted on the power conversion device in the third embodiment.
  • the schematic diagram which shows the flow-path process to the stage before hydraulic fluid enclosure of the self-excited vibration heat pipe mounted in the power converter device in Example 4.
  • FIG. The perspective view which shows the structure of the power converter device in Example 5.
  • FIG. 7 The perspective view which shows the structure of the power converter device in Example 7.
  • FIG. 8 The perspective view which shows the structure of the power converter device in Example 8.
  • FIG. The schematic of the flow-path structure of the self-excited vibration heat pipe provided in the power converter device in Example 9.
  • FIG. 10 The schematic of the flow-path structure of the self-excited vibration heat pipe provided in the power converter device in Example 10.
  • a railway vehicle power conversion device including a semiconductor element that constitutes a power conversion circuit and a cooling device that cools heat generated from the semiconductor element, at least a part of the cooling device is arranged in parallel. And providing a self-excited vibration heat pipe having a plurality of sealed flow paths.
  • At least a part of the plurality of flow paths arranged in parallel is connected to each other, and the working fluid is poured into the plurality of flow paths at the same time to eliminate the communication, so that at least a part of the flow paths is parallel.
  • the plurality of closed flow paths have a linear shape parallel to the longitudinal direction of the self-excited vibration heat pipe.
  • the plurality of sealed flow paths are U-shaped.
  • a plurality of sealed flow paths have the same length.
  • the embodiment discloses that one end of the self-excited vibration heat pipe in the longitudinal direction is crushed.
  • the embodiment discloses that a plurality of sealed flow paths in which at least a part thereof are arranged in parallel are produced by crushing the plurality of flow paths.
  • the self-excited vibration heat pipe has a structure bent in a wave shape in the longitudinal direction.
  • a header part for flowing a working fluid into a plurality of flow paths is formed by removing a partition portion at one end of the plurality of flow paths and joining a sealing member.
  • the self-excited vibration heat pipe bent into a corrugated shape is supported by the heat receiving member, and one end of the self-excited vibration heat pipe on the side of the hydraulic fluid is long so as to protrude from the heat receiving member. To do.
  • the self-excited vibration heat pipe bent into a corrugated shape is supported by the heat receiving member, and one end of the self-excited vibration heat pipe on the side of the hydraulic fluid is bent so as to be lifted from the heat receiving member. Is disclosed.
  • the self-excited vibration heat pipe bent into a corrugated shape is supported by the heat receiving member, and the heat receiving member has a structure in which the periphery of one end of the self-excited vibration heat pipe on the hydraulic fluid sealing side is cut out. Disclose.
  • the self-excited vibration heat pipe bent into a corrugated shape is supported by the heat receiving member, and one end of the self-excited vibration heat pipe on the side of the hydraulic fluid is directed vertically upward from the heat receiving surface of the heat receiving member. Is disclosed.
  • FIG. 1 is a configuration diagram of a power conversion device mounted on a railway vehicle in the present embodiment.
  • the power conversion device is provided below the floor of the vehicle body of the railway vehicle 200 and controls the rotation speed of the electric motor by changing the frequency of electric power supplied to the electric motor (not shown) that drives the railway vehicle 200.
  • the power conversion device includes a power unit (power conversion circuit) including a plurality of power semiconductor modules 11 and electronic components 20, and a cooling device that cools heat generated when the power unit operates.
  • a power unit power conversion circuit
  • the power conversion device includes a power unit (power conversion circuit) including a plurality of power semiconductor modules 11 and electronic components 20, and a cooling device that cools heat generated when the power unit operates.
  • the power conversion device is fixed in a state of being suspended from the bottom of the vehicle body of the railway vehicle 200, for example.
  • FIG. 2 is a cross-sectional view of the cooling device for the power conversion device as seen from the traveling direction of the railway vehicle in this embodiment.
  • Arrows 101 and 102 indicate the direction of traveling wind generated by traveling in the traveling direction of the railway vehicle (see FIG. 1). Since the railway vehicle moves in either the front or rear direction, traveling wind is generated in either direction of the arrow 101 or 102 accordingly.
  • the cooling device has a heat receiving member 10, a self-excited vibration heat pipe 12, and fins 13.
  • FIG. 3 is a perspective view of the cooling device of the power conversion device in the present embodiment.
  • a plurality of power semiconductor modules 11 are arranged and arranged on the upper surface of the heat receiving member 10.
  • the heat receiving member 10 is made of a metal such as an aluminum alloy, iron, or copper, for example.
  • the power semiconductor module 11 includes a plurality of power semiconductor elements.
  • the power semiconductor element is, for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).
  • the power semiconductor module 11 is fixed to one surface (upper surface) of the heat receiving member 10 by a screw or the like (not shown) through a member such as grease (not shown).
  • an electrical component 20 such as a circuit for driving the IGBT or the MOSFET is installed.
  • the heat radiating portion 3 is provided on the surface opposite to the surface on which the power semiconductor module 11 is installed in the heat receiving member 10 (the lower side in FIG. 3).
  • the heat radiating section 3 is constituted by, for example, a self-excited vibration heat pipe 12 and a wave-shaped fin 13 made of an aluminum alloy or the like.
  • a self-excited vibration heat pipe 12 As the fins 13, wave-shaped fins are used in this embodiment, but other fins may be used.
  • the self-excited vibration heat pipe 12 shown in FIG. 2 has a shape in which a plate-like heat pipe is bent into a wave shape in the longitudinal direction of the heat pipe.
  • Each of the heat receiving member 10, the self-excited vibration heat pipe 12 and the fin 13 is fixed by brazing or the like.
  • FIG. 4 is a schematic diagram showing a flow path structure of a self-excited vibration heat pipe used as a cooling device of a power conversion device in the present embodiment.
  • the self-excited oscillating heat pipe 12 is configured by a plurality of sealed hydraulic fluid flow paths 1 that are arranged in parallel and parallel and do not communicate with each other in each row.
  • a partition 4 is provided between the hydraulic fluid channels 1.
  • the channel diameter and the width of the partition part 4 are each in the order of mm, and the channel length is sufficiently longer than the channel diameter.
  • FIG. 5 is a diagram showing a cross-sectional structure of the self-excited vibration heat pipe shown in FIG. 4 as a cross section AA in FIG.
  • the thickness of the self-excited vibration heat pipe 12 is set to the order of mm on the basis of thermal conductivity and ease of processing.
  • the self-excited vibration heat pipe has a very small flow path diameter
  • the movement resistance of the hydraulic fluid is easily affected by the viscosity increase, and there is a concern about the effect of the viscosity increase in a low temperature environment.
  • the closed flow channel does not have a meandering turn portion in the in-plane direction of the self-excited vibration heat pipe 12.
  • the movement resistance of the hydraulic fluid is smaller than that of the prior art with a one-stroke serpentine flow path structure.
  • the air column and the liquid column become easier to move and the cooling performance can be improved.
  • the moving resistance of the working fluid can be reduced as compared with the prior art of the one-stroke serpentine flow channel structure, so that the temperature range usable as a cooling device is widened.
  • the movement resistance of the hydraulic fluid is small, it can be operated as a self-excited vibration heat pipe even in a small calorific value region where bubbles are difficult to vibrate.
  • the maximum heat transport amount is assumed when handling large power as in a railway vehicle power converter, but it is possible to cope with a small amount of heat generated during coasting, that is, the amount of heat generated. It can also be applied when the range is wide.
  • the self-excited vibration heat pipe has a thin wall around the hydraulic fluid flow path 1, it is highly likely to be damaged by a collision of flying objects.
  • the flow path structure having a plurality of flow paths that are not in communication with each other as in the present embodiment can be damaged even when one part of the self-excited vibration heat pipe 12 is damaged. Only the damaged flow path is limited, and the remaining flow paths continue to operate as self-excited vibration heat pipes, thereby reducing the deterioration in cooling performance.
  • the cooling performance is comparable to that of a closed flow path without communication. Therefore, it is possible to estimate the average cooling performance for each channel. Thereby, it is possible to estimate the ratio of the number of broken channels among all the channels and the change in cooling performance when the number of channels is increased or decreased.
  • FIG. 6 is a perspective view in the case where the self-excited vibration heat pipe in this embodiment has a meandering structure in which the heat receiving portion and the heat radiating portion reciprocate alternately.
  • An example is shown in which the self-excited vibration heat pipe 12 meanders so as to alternately reciprocate between the heat receiving portion 2 and the heat radiating portion 3 and is bent into a corrugated shape.
  • the meandering pitch and meandering width are constant, and the heat receiving portion 2 is flat so that it can contact the heat receiving member 10.
  • the meandering pitch refers to the distance between adjacent meandering turns of the self-excited vibration heat pipe 12.
  • the meandering width means the distance from the heat receiving portion 2 of the self-excited vibration heat pipe 12 to the tip portion of the heat radiating portion 3.
  • the heat dissipating part 3 is a part other than the part in contact with the heat receiving member, and dissipates heat by taking natural convection, vehicle traveling wind, etc. between the self-excited vibration heat pipes 12.
  • the heat receiving portion 2 of the self-excited vibration heat pipe 12 has a structure that can be easily attached to the heat receiving member 10 or the heating element.
  • heat insulating portion between the heat receiving portion 2 and the heat radiating portion 3 that does not receive heat or radiate heat outside the flow path but transports heat.
  • the distance between the heat receiving part 2 and the heat radiating part 3 needs to be so short that the hydraulic fluid in the heat receiving part 2 reaches the heat radiating part 3 due to the vibration of the hydraulic fluid.
  • hydrocarbons such as water, alcohols and butane
  • hydrofluorocarbons such as water, alcohols and butane
  • hydrofluoroethers such as water, alcohols and butane
  • hydrofluoroolefins such as water, alcohols and butane
  • perfluoroketones such as water, alcohols and butane
  • R1336mzz (Z) which is a hydrofluoroolefin (HFO)
  • HFO hydrofluoroolefin
  • R1336mzz (Z) does not contain chlorine, it is chemically stable with respect to an aluminum alloy. The cooling performance can be maintained for a long time without corroding the excitation vibration heat pipe 12.
  • HFOs such as R1224yd (Z), R1234yf, R1234ze (E), R1123, R1234ze (Z), R1336mzz (E), R1233zd (Z) or R1233zd (Z) are used. Also good. Since HFOs have a low global warming potential and ozone depletion potential, the impact on the environment is reduced even when some of the flow paths are damaged by the impact of flying objects and the working fluid is released into the atmosphere. be able to.
  • the loss caused by the operation of the power semiconductor element becomes heat.
  • the heat generated from the power semiconductor element is transmitted to the self-excited vibration heat pipe 12 through the heat receiving member 10.
  • the hydraulic fluid sealed in the hydraulic fluid flow path 1 bumps at a plurality of heat receiving portions 2 that are in contact with the heat receiving member 10, causing a pressure increase.
  • the hydraulic fluid vibrates in the flow path, so that heat is transmitted to the tip of the heat radiating portion 3 of the self-excited vibration heat pipe 12.
  • the configuration of the present embodiment not only expands the temperature range and heat generation range that can be used as a cooling device, but also conventional cooling of self-excited vibration heat pipes when a part of the cooling device is damaged due to collision of flying objects, etc. It is possible to improve the reliability by reducing the performance degradation of the entire cooling device as compared with the device. Furthermore, since the cooling performance in units of flow paths can be estimated, the number of damaged flow paths among all the flow paths or the cooling performance when the number of flow paths is changed can be estimated.
  • This embodiment is different from the first embodiment in that the hydraulic fluid flow path 1 is U-shaped with an independent sealed flow path.
  • the difference from the first embodiment will be mainly described.
  • FIG. 7 is a schematic diagram showing a flow path structure of a self-excited vibration heat pipe used as a cooling device of a power conversion device in the present embodiment.
  • the flow paths arranged in parallel in parallel communicate with each other at one end in the longitudinal direction of the self-excited vibration heat pipe 12 to form a substantially U-shaped sealed flow path group.
  • the communicating part of the hydraulic fluid flow path 1 may be in the middle of the self-excited vibration heat pipe 12. Moreover, the communication location of each sealed flow path does not need to be unified.
  • a channel group may be mixed.
  • each closed flow channel communicating with each other is shorter than that of the prior art, when a part of the cooling device is damaged due to a collision of a flying object, the conventional self-excited vibration Compared to the heat pipe cooling device, the performance deterioration of the entire cooling device can be reduced.
  • the cooling performance of each flow channel group can be estimated, and the number of damaged flow channel groups or the number of flow channel groups among all the flow channel groups can be estimated. Cooling performance can be estimated.
  • Performance degradation can be reduced.
  • This example is a method for manufacturing a self-excited vibration heat pipe according to Examples 1 and 2.
  • FIG. 8 is a schematic diagram showing a process of manufacturing a flow path up to a previous stage in which a working fluid of a self-excited vibration heat pipe used as a cooling device of a power conversion device is sealed in the present embodiment.
  • a working fluid of a self-excited vibration heat pipe used as a cooling device of a power conversion device is sealed in the present embodiment.
  • FIG. 8A shows the first step of the flow path manufacturing in the present embodiment.
  • a multi-hole tube 30 having a large number of through holes 31 arranged in parallel in the longitudinal direction is prepared.
  • FIG. 8B shows the second step of the flow path manufacturing in the present example.
  • One end of the multi-hole tube 30 is sealed by joining a plate-shaped or square-shaped sealing member 32 having the same thickness and width as the multi-hole tube 30 by a joining means such as brazing or welding.
  • sealing may be performed by crushing one end of the multi-hole tube 30.
  • FIG. 8C shows the third step of the flow path manufacturing in the present example.
  • a part of the partition portion 4 separating each flow path is removed so that adjacent flow paths communicate with each other, thereby forming a communication flow path 34.
  • FIG. 8D shows the fourth step of the flow path manufacturing in the present example.
  • a plate-shaped or square-shaped sealing member 33 having the same thickness and width as the multi-hole tube 30 is attached to the side of the both ends of the self-excited vibration heat pipe as the working fluid sealing port, and joining means such as brazing or welding.
  • joining means such as brazing or welding.
  • FIG. 8 (e) shows the fifth step of the flow path manufacturing in the present embodiment.
  • the hydraulic fluid filling port 5 is attached to the header part 35.
  • the hydraulic fluid sealing port 5 is a hollow tube having a diameter equivalent to the channel diameter, and communicates with the communication channel 34. As long as it communicates with the communication channel 34, one of the channels may be extended.
  • the above-described fourth and fifth steps are welded to the multi-hole tube 30 in a state where the hydraulic fluid sealing port is already attached to form the header portion 35 including the communication channel 34. It may be replaced with the process of.
  • the manufacturing method of the meandering flow path described in Patent Document 1 includes a step of removing every other part of the partition that separates the flow paths at both ends of the multi-hole tube.
  • a part of the partition wall that separates the flow paths needs to be removed only on one side of the multi-hole tube. All the partition walls inside the first row and the last row of the channel of the hole tube may be removed.
  • the working fluid sealing port 5 at the tip of the communication channel 34, the working fluid can be sealed in all the channels at once.
  • each flow path communicating with the communication flow path 34 When the length of each flow path communicating with the communication flow path 34 is equal, the working fluid can be poured uniformly into all the flow paths, and the cooling performance of each flow path is equalized when operating as a cooling device. Let me.
  • the self-excited vibration heat pipe 12 is bent into a meandering shape a plurality of times so as to have the same reciprocal width and pitch and a flat surface for contacting the heat receiving member.
  • the heat receiving member 10 is brought into contact with one end portion forming the heat receiving portion of the self-excited vibration heat pipe 12 and the fins 13 are attached between the self-excited vibration heat pipes.
  • a required amount of hydraulic fluid is sealed in the flow path of the self-excited vibration heat pipe 12 through the hydraulic fluid sealing port 5.
  • FIG. 9 is a cross-sectional view taken along the line BB of FIG. 8, regarding the fourth and fifth steps of manufacturing the cooling device using the self-excited vibration heat pipe.
  • FIG. 9 after sealing the hydraulic fluid flow path in the header portion 35 through the third process, a process in the case of manufacturing a plurality of sealed flow paths that do not communicate with each other is shown.
  • FIGS. 9A and 9B show the fourth step of manufacturing the cooling device described above.
  • the header part 35 is crushed with tools, such as a vise, in the crushing position 36 of a communication flow path so that all the communication flow paths 34 may be crushed.
  • the crushed header portion 35 has a shape as shown in FIG.
  • FIGS. 9C and 9D show the fifth step of manufacturing the cooling device described above. As shown in (c), the crushed header portion 35 is folded inward, and is crushed at the crushing position 37 after being folded, close to the end of the self-excited vibration heat pipe 12. Finally, the shape of the crushed header part is as shown in (d). The hydraulic fluid filling port 5 (not shown) is removed before or after being bent and crushed.
  • the end of the flow path is crushed, folded, and then crushed again, thereby improving the sealing performance of the flow path and preventing refrigerant leakage from the flow path end. Can do.
  • channel manufacturing method and cooling device manufacturing method may be applied when manufacturing a plurality of channel groups (channel structure of Example 2) that are in communication with each other. Good.
  • the present embodiment does not require a high level of technology when manufacturing the flow path, so the time and cost can be reduced, and the number of times the hydraulic fluid is sealed can be reduced by the communication flow path. Further, when the cooling device is manufactured, the end of the flow path is crushed, bent, and then crushed again, so that the airtightness of the flow path is improved and refrigerant leakage from the flow path end can be prevented.
  • the present embodiment is a method of manufacturing a self-excited vibration heat pipe in which the end portion on the side of the hydraulic fluid sealing port is sealed with a hydraulic fluid sealing port and a sealing member with a communication channel.
  • the difference from the first to third embodiments will be mainly described.
  • FIG. 10 is a schematic diagram showing the flow path manufacturing process up to the previous stage in which the working fluid of a self-excited vibration heat pipe used as a cooling device of the power conversion device in this embodiment is sealed.
  • 10 (a) and 10 (b) show the first and second steps of the flow channel manufacturing in the present embodiment. Both steps are the same as the first and second steps of Example 3.
  • 10 (c) and 10 (d) show a third step of the flow path manufacturing in the present embodiment.
  • the end portion on the side of the hydraulic fluid sealing port 5 is the same in material, thickness and width as the multi-hole tube, and is sealed by a sealing member 38 having a hydraulic fluid sealing port and a communication channel.
  • Forming a header portion including The sealing member 38 with the hydraulic fluid sealing port and the communication channel is manufactured by a method such as removing the communication channel portion from a plate-shaped or rectangular member.
  • the step of removing the partition walls between the flow paths (third process of the third embodiment) can be omitted at the time of manufacturing the flow path as compared with the third embodiment, and the process is configured only by joining. Thereby, time and cost can be suppressed, and the number of times the hydraulic fluid is sealed by the communication channel can be reduced. Further, since the members that form the communication flow path are joined, the communication flow path diameter is constant, and when the hydraulic fluid is sealed in each flow path, the variation in the hydraulic fluid filling rate between the flow paths is reduced.
  • This embodiment is characterized by a structure in which a self-excited vibration heat pipe is supported by a heat receiving member.
  • a self-excited vibration heat pipe is supported by a heat receiving member.
  • FIG. 11 is a perspective view showing the structure of the power conversion device including the cooling device in this embodiment, and shows an example of the end portion structure of the self-excited vibration heat pipe on the side of the hydraulic fluid filling port.
  • the end of the self-excited vibration heat pipe 12 on the side where the hydraulic fluid sealing port 5 is provided is set long enough to protrude from the end of the heat receiving member 10.
  • the side of the self-excited vibration heat pipe 12 on which the hydraulic fluid is sealed is made long enough to protrude from the heat receiving member 10, whereby the side of the self-excited vibration heat pipe 12 on which the hydraulic fluid sealing port 5 is provided.
  • a space for using the work tool can be secured. Thereby, the time and cost when manufacturing the power converter device including a cooling device can be held down.
  • the present embodiment is characterized in that one end of the self-excited vibration heat pipe on the side where the hydraulic fluid is sealed is bent so as to be lifted from the heat receiving member.
  • FIG. 12 is a perspective view showing the structure of the power conversion device including the cooling device in the present embodiment, showing an example of the end portion structure on the side of the hydraulic fluid sealing port of the self-excited vibration heat pipe in the present embodiment.
  • the end of the self-excited vibration heat pipe 12 on the side where the hydraulic fluid sealing port 5 is provided is bent once in a direction perpendicular to the heat receiving member 10 as a direction away from the heat receiving member 10, and further bent once in a direction parallel to the heat receiving member 10. Accordingly, the end portion on the side where the hydraulic fluid sealing port 5 is provided is made to float from the heat receiving member 10.
  • the end of the self-excited vibration heat pipe on the side where the hydraulic fluid is sealed is shaped so as to be lifted from the heat receiving member, so that the end of the self-excited vibration heat pipe 12 on the side where the hydraulic fluid is sealed is provided.
  • a space for using the work tool can be secured. Thereby, the time and cost when manufacturing the power converter device including a cooling device can be held down.
  • the present embodiment is characterized in that the heat receiving member has a structure in which the periphery of one end of the self-excited vibration heat pipe on the hydraulic fluid sealing side is cut out.
  • the difference from the first to sixth embodiments will be mainly described.
  • FIG. 13 is a perspective view showing the structure of the power conversion device including the cooling device in this embodiment, and shows an example of the structure of the heat receiving member that supports the self-excited vibration heat pipe.
  • the heat receiving member 10 has a structure in which the periphery of the end portion on the side where the hydraulic fluid sealing port 5 is provided is cut out.
  • the heat receiving member 10 has a structure in which the periphery of one end of the self-excited vibration heat pipe 12 on the hydraulic fluid enclosure side is cut out, so that the self-excited vibration heat pipe 12 on the side where the hydraulic fluid enclosure port 5 is provided.
  • a space for using the work tool can be secured. Thereby, the time and cost when manufacturing the power converter device including a cooling device can be held down.
  • the present embodiment is characterized in that the end portion of the self-excited vibration heat pipe on the hydraulic fluid sealing side has a vertically upward structure from the heat receiving surface of the heat receiving member.
  • the difference from the first to seventh embodiments will be mainly described.
  • FIG. 14 is a perspective view showing the structure of the power conversion device including the cooling device in the present embodiment, and shows the positional relationship between the structure of the self-excited vibration heat pipe and the heat receiving member.
  • the end portion of the self-excited vibration heat pipe 12 is provided on the heat radiating portion side, and the hydraulic fluid filling port 5 is installed in the opposite direction to the heat receiving member 10 at the end of the end portion of the self-excited vibration heat pipe 12.
  • the hydraulic fluid sealing port 5 may be attached to any position of the self-excited vibration heat pipe 12 as long as it is on the heat radiating portion side.
  • the end portion of the self-excited vibration heat pipe on the side where the hydraulic fluid is encapsulated is lifted vertically upward from the heat receiving portion, so that the self-excited oscillation heat pipe 12 on the side where the hydraulic fluid enclosure port 5 is provided.
  • a space for using the work tool can be secured. Thereby, the time and cost when manufacturing the power converter device including a cooling device can be held down.
  • this embodiment is characterized in that a part of the hydraulic fluid channel 1 is communicated with an independent sealed channel.
  • the difference from the first embodiment will be mainly described.
  • FIG. 15 is a schematic diagram showing a flow path structure of a self-excited vibration heat pipe used as a cooling device for a power conversion device in the present embodiment.
  • the hydraulic fluid channels 1 arranged in parallel in parallel communicate with each other at both ends in the longitudinal direction of the self-excited vibration heat pipe 12 to form a sealed channel group composed of two or more rows of hydraulic fluid channels 1.
  • a plurality of closed flow channel groups are formed inside one self-excited vibration heat pipe 12.
  • the communication location of the hydraulic fluid flow path 1 is not limited to both ends, and may be one end or the middle of the self-excited vibration heat pipe 12. Moreover, the communication location of each sealed flow path does not need to be unified.
  • a road group may be mixed.
  • the entire cooling device is compared with the conventional self-excited vibration heat pipe cooling device. Performance degradation can be reduced.
  • the cooling performance since it has at least a communication portion with the adjacent flow path, when limited to a single sealed flow path, compared with Example 1 having a structure without communication, due to collision of flying objects, etc. Although some deterioration of the cooling performance at the time of breakage is inevitable, since the number of parallel flow paths can be increased per unit area, it is possible to obtain a cooling performance that is not significantly different from that of the first embodiment. . In addition, since the flow path length is still short and the hydraulic fluid movement resistance is small compared to the prior art with a one-stroke serpentine flow path structure, the temperature range usable as a cooling device can be widened.
  • the cooling device may be damaged. Performance degradation can be reduced.
  • FIG. 16 is a schematic diagram showing a flow path structure of a self-excited vibration heat pipe used as a cooling device for a power conversion device in the present embodiment.
  • the hydraulic fluid flow paths 1 arranged in parallel in one self-excited oscillating heat pipe 12 are arranged at both ends in the longitudinal direction of the self-excited oscillating heat pipe 12. Two or more rows communicate with each other to form one sealed flow path, and a plurality of self-excited vibration heat pipes 12 are installed.
  • the communication location of the hydraulic fluid flow path 1 is not limited to both ends as shown in FIG. 16, and may be one end or in the middle of the self-excited vibration heat pipe 12. Moreover, the communication location of each sealed flow path does not need to be unified.
  • the self-excited vibration heat pipe 12 in which a plurality of self-excited vibration heat pipes 12 are arranged with a plurality of one-line closed flow paths that are not in communication with each other as in the first embodiment, as in the present embodiment.
  • Such self-excited vibration heat pipes 12 having a group of sealed flow paths communicating with each other in two or more rows may be mixed.
  • the entire cooling device is compared with the conventional self-excited vibration heat pipe cooling device. Performance degradation can be reduced.
  • the cooling performance of each self-excited vibration heat pipe can be estimated, and all of the self-excited vibration heat pipes are damaged. It is possible to estimate the cooling performance when the number of self-excited vibration heat pipes or the number of self-excited vibration heat pipes is increased or decreased.
  • the cooling performance since it has at least a communication portion with the adjacent flow path, when limited to a single sealed flow path, compared with Example 1 having a structure without communication, due to collision of flying objects, etc. Although some deterioration of the cooling performance at the time of breakage is inevitable, since the number of parallel flow paths can be increased per unit area, it is possible to obtain a cooling performance that is not significantly different from that of the first embodiment. . In addition, since the flow path length is still short and the hydraulic fluid movement resistance is small compared to the prior art with a one-stroke serpentine flow path structure, the temperature range usable as a cooling device can be widened. Furthermore, since the single self-excited vibration heat pipe 12 has a compact size as compared with the first and ninth embodiments, it is possible to flexibly cope with the space at the installation location.

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Abstract

The purpose of the present invention is to expand a usable temperature range, reduce performance deterioration during sudden damage to a fluid passage, and improve reliability, in a cooling device provided with a self-excited vibration heat pipe used in a moving body such as a rail vehicle. To achieve the purpose, this electric power conversion apparatus according to the present invention is provided with: a semiconductor element which constitutes an electric power conversion circuit; and a cooling device which cooling heat generated from the semiconductor element, wherein the cooling device is provided with a self-excited vibration heat pipe and the self-excited vibration heat pipe has a plurality of closed fluid passages disposed in parallel.

Description

電力変換装置および自励振動ヒートパイプの製造方法Power converter and self-excited vibration heat pipe manufacturing method
　本発明は、自励振動ヒートパイプを適用した電力変換装置および自励振動ヒートパイプの製造方法に関し、鉄道車両用の電力変換装置として好適である。 The present invention relates to a power conversion device to which a self-excited vibration heat pipe is applied and a method for manufacturing the self-excited vibration heat pipe, and is suitable as a power conversion device for a railway vehicle.
　自励振動ヒートパイプは、一般的に、ｍｍオーダーの一筆書き細径蛇行流路により構成されており、表面張力により液柱と気柱が交互に存在する状態で作動液が封入されている。流路中には、複数の受熱部（高温部）および放熱部（低温部）が交互に設けられており、受熱部における突沸による圧力上昇と、放熱部における凝縮による圧力減少により、液柱と気柱が自励的に振動し、熱の輸送を行う。 The self-excited oscillating heat pipe is generally constituted by a fine stroke meandering flow path in the order of mm, and the working fluid is sealed in a state in which liquid columns and air columns are alternately present due to surface tension. A plurality of heat receiving portions (high temperature portions) and heat radiating portions (low temperature portions) are alternately provided in the flow path, and the liquid column is formed by pressure increase due to bumping at the heat receiving portions and pressure decrease due to condensation at the heat radiating portions. The air column vibrates itself and transports heat.
　自励振動ヒートパイプは、従来のヒートパイプとは異なり、重力による還流を必要としないため、設置姿勢が自由であり、従来のヒートパイプに比べて小型にできるといった利点を持つ。 自 Unlike conventional heat pipes, self-excited vibration heat pipes do not require reflux due to gravity, so they have the advantage of being free to install and being smaller than conventional heat pipes.
　また、特許文献１には、多孔扁平管の細孔群を、その両端部に近接した部分において相互に連結し、この扁平管が高温部と低温部を多数回往復蛇行するよう再成形した構造の自励振動ヒートパイプが記載されている。 Patent Document 1 discloses a structure in which pore groups of a porous flat tube are connected to each other at portions close to both ends, and the flat tube is reshaped so as to meander a high temperature portion and a low temperature portion many times. A self-excited vibration heat pipe is described.
特開平９－１４８７５号公報Japanese Patent Laid-Open No. 9-14875
　本願発明者が、自励振動ヒートパイプを鉄道車両用電力変換装置の冷却装置に適用することについて鋭意検討した結果、次の知見を得るに至った。 The inventor of the present application diligently studied the application of the self-excited vibration heat pipe to the cooling device for a railway vehicle power converter, and as a result, the following knowledge was obtained.
　鉄道車両を駆動する電動機を制御するための電力変換装置は、鉄道車両の床下等に設置されることが一般的であり、電力変換装置向け冷却装置も、同様に、床下等に設置されることが多い。鉄道車両は、野外を走行するため様々な環境下での使用が想定されるだけでなく、速度変化によって外部の温度変化の影響をより強く受けることとなる。そのため、鉄道車両用電力変換装置の冷却装置は、様々な環境下で動作することが求められる。 The power conversion device for controlling the electric motor that drives the railway vehicle is generally installed under the floor of the railway vehicle, and the cooling device for the power conversion device is also installed under the floor similarly. There are many. Railcars are not only expected to be used in various environments because they travel outdoors, but are also more strongly affected by external temperature changes due to speed changes. For this reason, the cooling device for a railway vehicle power converter is required to operate in various environments.
　一方、自励振動ヒートパイプは、流路に接する受熱部と放熱部の数が多い程、重力依存性が小さくなる傾向があるため、一筆書き蛇行流路構造が一般的に採用されている。しかし、自励振動ヒートパイプは流路径が非常に小さいため、一筆書き蛇行流路構造のように流路長が長い構造では、鉄道車両に適用する際に、以下のような課題に直面する。 On the other hand, since the self-excited vibration heat pipe has a tendency that the gravity dependency becomes smaller as the number of heat receiving portions and heat radiating portions in contact with the flow path is larger, a one-stroke serpentine flow path structure is generally adopted. However, since the self-excited vibration heat pipe has a very small flow path diameter, a structure having a long flow path length, such as a one-stroke serpentine flow path structure, faces the following problems when applied to a railway vehicle.
　自励振動ヒートパイプは、作動液が自励振動によって移動することで熱を輸送する。そのため、作動液の移動抵抗が大きいと、作動液が振動しづらくなり冷却性能が低下する。この移動抵抗の大きさは、例えば、作動液の粘度に依存するが、温度が低下すると作動液の粘度は上昇する傾向があるため、低温環境下において自励振動ヒートパイプの冷却性能が低下する、もしくは自励振動ヒートパイプが動作を停止することが懸念される。 The self-excited vibration heat pipe transports heat by moving the hydraulic fluid by self-excited vibration. Therefore, if the movement resistance of the hydraulic fluid is large, the hydraulic fluid is difficult to vibrate and the cooling performance is deteriorated. The magnitude of this movement resistance depends on, for example, the viscosity of the hydraulic fluid. However, since the viscosity of the hydraulic fluid tends to increase as the temperature decreases, the cooling performance of the self-excited vibration heat pipe decreases in a low temperature environment. Or, there is a concern that the self-excited vibration heat pipe stops operating.
　このように、冷却性能が低下した場合、冷却風が低温であっても発熱体が十分に冷却されず発熱体の周辺は高温になり、冷却装置が求められる冷却効果を満足できない可能性がある。 Thus, when the cooling performance is lowered, even if the cooling air is low temperature, the heating element is not sufficiently cooled, and the periphery of the heating element becomes high temperature, which may not satisfy the cooling effect required by the cooling device. .
　また、特許文献１に記載された一筆書き蛇行流路構造では、流路長が長いために低温環境下で粘度の影響を受けやすく、使用可能な温度範囲が十分でないことが懸念される。 Also, the one-stroke serpentine flow path structure described in Patent Document 1 is likely to be affected by viscosity in a low temperature environment because of the long flow path length, and there is a concern that the usable temperature range is not sufficient.
　そしてまた、自励振動ヒートパイプは、発熱量が小さいときに、気泡が振動しづらい傾向がある。特に、鉄道車両用電力変換装置は、電動機を駆動している時の発熱量は一般的に大きいが、惰行時など電動機を駆動せず発熱量が小さい状態もあり、つまり発熱量の変化幅が大きい。このため、最大発熱量のみを想定して自励振動ヒートパイプの流路長を長く設計したり、流路に分岐を設けて設計した場合、作動液の粘度が上昇する低発熱量での性能が低下する恐れがある。 Also, the self-excited vibration heat pipe tends to make it difficult for bubbles to vibrate when the calorific value is small. In particular, the power conversion device for a railway vehicle generally generates a large amount of heat when the motor is driven, but there is a state where the amount of heat generated is small without driving the motor such as during coasting. large. For this reason, when the flow path length of the self-excited vibration heat pipe is designed to be long by assuming only the maximum heat generation amount, or when the flow path is provided with a branch, the performance with a low heat generation amount that increases the viscosity of the working fluid May decrease.
　さらに、一般的な一筆書き蛇行流路構造や、特許文献１のように扁平管が両端部で連結した構造では、鉄道車両の走行時に飛来物の衝突により流路の一部に穴が空いた場合、破損した箇所から作動液が漏れ出し、その影響が全体におよび、自励振動ヒートパイプが動作不能となる不具合が懸念される。このように、特に野外での走行により飛来物の衝突可能性が高い鉄道車両用電力変換装置への適応には、信頼性の面で懸念がある。 Further, in a general one-stroke serpentine flow path structure or a structure in which flat tubes are connected at both ends as in Patent Document 1, a hole is formed in a part of the flow path due to a collision of flying objects when the railway vehicle is running. In such a case, there is a concern that the hydraulic fluid leaks from the damaged part, and the influence is exerted on the whole, and the self-excited vibration heat pipe becomes inoperable. As described above, there is a concern in terms of reliability in adapting to a power conversion apparatus for a railway vehicle that is highly likely to collide with flying objects due to traveling outdoors.
　本発明の目的は、鉄道車両といった移動体に使用する自励振動ヒートパイプを備える冷却装置として、使用可能な温度範囲を拡大し、かつ、突発的に流路に穴が空いた場合の性能劣化を小さくし、信頼性を向上させることにある。 An object of the present invention is to expand the usable temperature range as a cooling device including a self-excited vibration heat pipe used for a moving body such as a railway vehicle, and to deteriorate performance when a hole is suddenly opened in a flow path. Is to improve reliability.
　本発明に係る電力変換装置は、電力変換回路を構成する半導体素子と、半導体素子から発生する熱を冷却する冷却装置とを備え、冷却装置は自励振動ヒートパイプを備え、自励振動ヒートパイプは並列に配置された複数の密閉流路を有することを特徴とする。 A power conversion device according to the present invention includes a semiconductor element that constitutes a power conversion circuit and a cooling device that cools heat generated from the semiconductor element. The cooling device includes a self-excited vibration heat pipe, and the self-excited vibration heat pipe. Has a plurality of sealed flow paths arranged in parallel.
　本発明によれば、作動液の粘度が上昇する低温環境下においても、作動液の移動抵抗を小さく抑え、自励振動ヒートパイプを備える冷却装置として、使用可能な温度範囲を拡張することができる。また、飛来物の衝突等により一部の流路が破損した場合にも、被害を破損した流路のみの最小限にとどめ、残りを自励振動ヒートパイプとして動作可能とすることにより、冷却性能の劣化を最小限に抑えることができる。 According to the present invention, even in a low-temperature environment in which the viscosity of the hydraulic fluid increases, it is possible to extend the usable temperature range as a cooling device including a self-excited vibration heat pipe while suppressing the movement resistance of the hydraulic fluid. . In addition, even if a part of the flow path is damaged due to a collision with flying objects, the cooling performance is reduced by minimizing the damage only to the damaged flow path and allowing the rest to operate as a self-excited vibration heat pipe. Can be minimized.
実施例１における、鉄道車両に搭載された電力変換装置の構成図。The block diagram of the power converter device mounted in the rail vehicle in Example 1. FIG. 実施例１における、電力変換装置の冷却装置を鉄道車両の進行方向から見た断面図。Sectional drawing which looked at the cooling device of the power converter device in Example 1 from the advancing direction of the railway vehicle. 実施例１における、電力変換装置の冷却装置の斜視図。The perspective view of the cooling device of the power converter device in Example 1. FIG. 実施例１における、電力変換装置に設けた自励振動ヒートパイプの流路構造の概略図。The schematic of the flow-path structure of the self-excited vibration heat pipe provided in the power converter device in Example 1. FIG. 実施例１における、電力変換装置に設けた自励振動ヒートパイプの断面構造を示す、図４におけるＡ－Ａ断面図。FIG. 5 is a cross-sectional view taken along line AA in FIG. 4, showing a cross-sectional structure of a self-excited vibration heat pipe provided in the power conversion device in the first embodiment. 実施例１における、自励振動ヒートパイプが受熱部と放熱部を交互に往復するよう蛇行する場合の構造を示す斜視図。The perspective view which shows the structure in the Example 1 when the self-excited vibration heat pipe meanders so that a heat receiving part and a thermal radiation part may reciprocate alternately. 実施例２における、電力変換装置に搭載される自励振動ヒートパイプの流路構造を示す概略図。The schematic diagram which shows the flow-path structure of the self-excited vibration heat pipe mounted in the power converter device in Example 2. FIG. 実施例３における、電力変換装置に搭載される自励振動ヒートパイプの作動液封入前段階までの製造工程を示す概略図。Schematic which shows the manufacturing process to the stage before hydraulic fluid enclosure of the self-excited vibration heat pipe mounted in the power converter device in Example 3. FIG. 実施例３における、電力変換装置に搭載される自励振動ヒートパイプの製造方法の第四および第五工程を示す、図８におけるＢ－Ｂ断面図。FIG. 9 is a cross-sectional view taken along line BB in FIG. 8 showing the fourth and fifth steps of the method for manufacturing the self-excited vibration heat pipe mounted on the power conversion device in the third embodiment. 実施例４における、電力変換装置に搭載される自励振動ヒートパイプの作動液封入前段階までの流路工程を示す概略図。The schematic diagram which shows the flow-path process to the stage before hydraulic fluid enclosure of the self-excited vibration heat pipe mounted in the power converter device in Example 4. FIG. 実施例５における、電力変換装置の構造を示す斜視図。The perspective view which shows the structure of the power converter device in Example 5. FIG. 実施例６における、電力変換装置の構造を示す斜視図。The perspective view which shows the structure of the power converter device in Example 6. FIG. 実施例７における、電力変換装置の構造を示す斜視図。The perspective view which shows the structure of the power converter device in Example 7. FIG. 実施例８における、電力変換装置の構造を示す斜視図。The perspective view which shows the structure of the power converter device in Example 8. FIG. 実施例９における、電力変換装置に設けた自励振動ヒートパイプの流路構造の概略図。The schematic of the flow-path structure of the self-excited vibration heat pipe provided in the power converter device in Example 9. FIG. 実施例１０における、電力変換装置に設けた自励振動ヒートパイプの流路構造の概略図。The schematic of the flow-path structure of the self-excited vibration heat pipe provided in the power converter device in Example 10. FIG.
　実施例では、電力変換回路を構成する半導体素子と、半導体素子から発生する熱を冷却する冷却装置とを備えた鉄道車両用電力変換装置において、冷却装置が、その少なくとも一部が並列に配置された複数の密閉流路を有する自励振動ヒートパイプを備えることを開示する。 In an embodiment, in a railway vehicle power conversion device including a semiconductor element that constitutes a power conversion circuit and a cooling device that cools heat generated from the semiconductor element, at least a part of the cooling device is arranged in parallel. And providing a self-excited vibration heat pipe having a plurality of sealed flow paths.
　また、実施例では、その少なくとも一部が並列に配置された複数の流路の一端を連通させ、複数の流路に同時に作動液を流し込み、連通を解消することにより、その少なくとも一部が並列に配置された複数の密閉流路を作製する、鉄道車両用電力変換装置の冷却装置に用いる自励振動ヒートパイプの製造方法を開示する。 In the embodiment, at least a part of the plurality of flow paths arranged in parallel is connected to each other, and the working fluid is poured into the plurality of flow paths at the same time to eliminate the communication, so that at least a part of the flow paths is parallel. The manufacturing method of the self-excited vibration heat pipe used for the cooling device of the power converter device for rail vehicles which produces the several sealed flow path arrange | positioned to is disclosed.
　また、実施例では、複数の密閉流路が、自励振動ヒートパイプの長手方向に平行な直線形状であることを開示する。 Also, in the embodiment, it is disclosed that the plurality of closed flow paths have a linear shape parallel to the longitudinal direction of the self-excited vibration heat pipe.
　また、実施例では、複数の密閉流路がＵ字形状であることを開示する。 Also, in the embodiment, it is disclosed that the plurality of sealed flow paths are U-shaped.
　また、実施例では、複数の密閉流路が同じ長さであることを開示する。 Also, in the embodiment, it is disclosed that a plurality of sealed flow paths have the same length.
　また、実施例では、自励振動ヒートパイプの長手方向の一端が、圧潰されていることを開示する。また、実施例では、複数の流路を圧潰することにより、その少なくとも一部が並列に配置された複数の密閉流路を作製することを開示する。 Also, the embodiment discloses that one end of the self-excited vibration heat pipe in the longitudinal direction is crushed. In addition, the embodiment discloses that a plurality of sealed flow paths in which at least a part thereof are arranged in parallel are produced by crushing the plurality of flow paths.
　また、実施例では、自励振動ヒートパイプが、その長手方向に波型に折り曲げられた構造であることを開示する。 Also, in the embodiment, it is disclosed that the self-excited vibration heat pipe has a structure bent in a wave shape in the longitudinal direction.
　また、実施例では、複数の流路の一端にある仕切り部を除去し、封止部材を接合することにより、複数の流路に作動液を流し込むためのヘッダ部を形成することを開示する。 Further, in the embodiment, it is disclosed that a header part for flowing a working fluid into a plurality of flow paths is formed by removing a partition portion at one end of the plurality of flow paths and joining a sealing member.
　また、実施例では、波型に折り曲げた自励振動ヒートパイプが受熱部材に支持され、自励振動ヒートパイプの作動液封入側の一端が、受熱部材からはみ出すように長い構造であることを開示する。 Further, in the embodiment, it is disclosed that the self-excited vibration heat pipe bent into a corrugated shape is supported by the heat receiving member, and one end of the self-excited vibration heat pipe on the side of the hydraulic fluid is long so as to protrude from the heat receiving member. To do.
　また、実施例では、波型に折り曲げた自励振動ヒートパイプが受熱部材に支持され、自励振動ヒートパイプの作動液封入側の一端が、受熱部材から浮き上がるように折り曲げられた構造であることを開示する。 In the embodiment, the self-excited vibration heat pipe bent into a corrugated shape is supported by the heat receiving member, and one end of the self-excited vibration heat pipe on the side of the hydraulic fluid is bent so as to be lifted from the heat receiving member. Is disclosed.
　また、実施例では、波型に折り曲げた自励振動ヒートパイプが受熱部材に支持され、受熱部材が、自励振動ヒートパイプの作動液封入側の一端の周辺を切り欠いた構造であることを開示する。 Further, in the embodiment, the self-excited vibration heat pipe bent into a corrugated shape is supported by the heat receiving member, and the heat receiving member has a structure in which the periphery of one end of the self-excited vibration heat pipe on the hydraulic fluid sealing side is cut out. Disclose.
　また、実施例では、波型に折り曲げた自励振動ヒートパイプが受熱部材に支持され、自励振動ヒートパイプの作動液封入側の一端が、受熱部材の受熱面から鉛直上向きを向いていることを開示する。 Further, in the embodiment, the self-excited vibration heat pipe bent into a corrugated shape is supported by the heat receiving member, and one end of the self-excited vibration heat pipe on the side of the hydraulic fluid is directed vertically upward from the heat receiving surface of the heat receiving member. Is disclosed.
　また、実施例では、複数の密閉流路の一部が連通されていることを開示する。 Also, in the embodiment, it is disclosed that some of the plurality of sealed flow paths are communicated.
　以下では、上記およびその他の本発明の新規な特徴と効果について図面を参酌して説明する。なお、図面は、本発明の理解のために用いるものであり、権利範囲を限縮するものではない。 Hereinafter, the above and other novel features and effects of the present invention will be described with reference to the drawings. The drawings are used for understanding the present invention and do not limit the scope of rights.
　図１は、本実施例における、鉄道車両に搭載された電力変換装置の構成図である。電力変換装置は、鉄道車両２００の車体床下等に設けられ、鉄道車両２００を駆動する電動機（図示せず）に供給する電力の周波数を変えることにより、電動機の回転速度の制御を行う。 FIG. 1 is a configuration diagram of a power conversion device mounted on a railway vehicle in the present embodiment. The power conversion device is provided below the floor of the vehicle body of the railway vehicle 200 and controls the rotation speed of the electric motor by changing the frequency of electric power supplied to the electric motor (not shown) that drives the railway vehicle 200.
　電力変換装置は、複数のパワー半導体モジュール１１と電子部品２０とを備えたパワーユニット（電力変換回路）と、パワーユニット動作時に発生する熱を冷却する冷却装置とを有する。 The power conversion device includes a power unit (power conversion circuit) including a plurality of power semiconductor modules 11 and electronic components 20, and a cooling device that cools heat generated when the power unit operates.
　図１において、電力変換装置は、例えば、鉄道車両２００の車体の底部に吊り下げられた状態で固定されている。 In FIG. 1, the power conversion device is fixed in a state of being suspended from the bottom of the vehicle body of the railway vehicle 200, for example.
　以下、パワーユニットを含む電力変換装置と、パワーユニットを冷却する冷却装置の各構成について説明する。 Hereinafter, each configuration of the power conversion device including the power unit and the cooling device for cooling the power unit will be described.
　図２は、本実施例における、電力変換装置の冷却装置を鉄道車両の進行方向から見た断面図である。矢印１０１と１０２は、鉄道車両（図１参照）の進行方向への走行により生じる走行風の方向を示す。鉄道車両は、前後いずれの方向にも移動するので、それに伴って、矢印１０１または１０２のいずれかの方向に走行風が生じることになる。 FIG. 2 is a cross-sectional view of the cooling device for the power conversion device as seen from the traveling direction of the railway vehicle in this embodiment. Arrows 101 and 102 indicate the direction of traveling wind generated by traveling in the traveling direction of the railway vehicle (see FIG. 1). Since the railway vehicle moves in either the front or rear direction, traveling wind is generated in either direction of the arrow 101 or 102 accordingly.
　冷却装置は、受熱部材１０、自励振動ヒートパイプ１２、およびフィン１３を有する。 The cooling device has a heat receiving member 10, a self-excited vibration heat pipe 12, and fins 13.
　図３は、本実施例における、電力変換装置の冷却装置の斜視図である。受熱部材１０の上面には、パワー半導体モジュール１１が、複数個、整列設置されている。受熱部材１０は、例えば、アルミニウム合金、鉄、銅、等の金属から成る。パワー半導体モジュール１１は、複数のパワー半導体素子を含む。パワー半導体素子は、例えば、ＩＧＢＴ（Ｉｎｓｕｌａｔｅｄ　Ｇａｔｅ　Ｂｉｐｏｌａｒ　Ｔｒａｎｓｉｓｔｏｒ）や、ＭＯＳＦＥＴ（Ｍｅｔａｌ－Ｏｘｉｄｅ－Ｓｅｍｉｃｏｎｄｕｃｔｏｒ　Ｆｉｅｌｄ－Ｅｆｆｅｃｔ　Ｔｒａｎｓｉｓｔｏｒ）等である。 FIG. 3 is a perspective view of the cooling device of the power conversion device in the present embodiment. A plurality of power semiconductor modules 11 are arranged and arranged on the upper surface of the heat receiving member 10. The heat receiving member 10 is made of a metal such as an aluminum alloy, iron, or copper, for example. The power semiconductor module 11 includes a plurality of power semiconductor elements. The power semiconductor element is, for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).
　パワー半導体モジュール１１は、グリース等の部材（図示せず）を介して、ねじ等（図示せず）によって、受熱部材１０の一面（上面）に固定される。 The power semiconductor module 11 is fixed to one surface (upper surface) of the heat receiving member 10 by a screw or the like (not shown) through a member such as grease (not shown).
　受熱部材１０においてパワー半導体モジュール１１を設置する側の面（図３の上側）には、図１に示すように密閉されたケースであるインバータ箱２１が設けられ、当該ケース内には、フィルタコンデンサおよび、ＩＧＢＴまたはＭＯＳＦＥＴを駆動するための回路等の電気部品２０が設置されている。 An inverter box 21, which is a sealed case as shown in FIG. 1, is provided on the surface of the heat receiving member 10 on which the power semiconductor module 11 is installed (upper side in FIG. 3). In addition, an electrical component 20 such as a circuit for driving the IGBT or the MOSFET is installed.
　また、受熱部材１０においてパワー半導体モジュール１１を設置する面の反対側の面（図３の下側）には、放熱部３が設けられる。 In addition, the heat radiating portion 3 is provided on the surface opposite to the surface on which the power semiconductor module 11 is installed in the heat receiving member 10 (the lower side in FIG. 3).
　放熱部３は、例えば、自励振動ヒートパイプ１２、アルミニウム合金等からなる波型のフィン１３により構成される。フィン１３は、本実施例では波型のフィンを用いているが、その他のフィンを用いることもできる。図２に示す自励振動ヒートパイプ１２は、板状のヒートパイプをヒートパイプの長手方向に波型に折り曲げた形状としている。 The heat radiating section 3 is constituted by, for example, a self-excited vibration heat pipe 12 and a wave-shaped fin 13 made of an aluminum alloy or the like. As the fins 13, wave-shaped fins are used in this embodiment, but other fins may be used. The self-excited vibration heat pipe 12 shown in FIG. 2 has a shape in which a plate-like heat pipe is bent into a wave shape in the longitudinal direction of the heat pipe.
　受熱部材１０、自励振動ヒートパイプ１２およびフィン１３のそれぞれは、ロウ付け等によって固定される。 Each of the heat receiving member 10, the self-excited vibration heat pipe 12 and the fin 13 is fixed by brazing or the like.
　図４は、本実施例における、電力変換装置の冷却装置として用いる自励振動ヒートパイプの流路構造を示す概略図である。自励振動ヒートパイプ１２は、並行並列に整列した、各列で相互に連通の無い密閉された複数の作動液流路１により構成されている。作動液流路１の間には仕切り部４が設けられている。流路径および仕切り部４の幅は、それぞれｍｍオーダーであり、流路長は流路径に比べて十分に長い。 FIG. 4 is a schematic diagram showing a flow path structure of a self-excited vibration heat pipe used as a cooling device of a power conversion device in the present embodiment. The self-excited oscillating heat pipe 12 is configured by a plurality of sealed hydraulic fluid flow paths 1 that are arranged in parallel and parallel and do not communicate with each other in each row. A partition 4 is provided between the hydraulic fluid channels 1. The channel diameter and the width of the partition part 4 are each in the order of mm, and the channel length is sufficiently longer than the channel diameter.
　図５は、図４に示す自励振動ヒートパイプの断面構造を、図４のＡ－Ａ断面として示す図である。自励振動ヒートパイプ１２の厚みは、熱伝導性や加工のしやすさからｍｍオーダー程度に設定される。 FIG. 5 is a diagram showing a cross-sectional structure of the self-excited vibration heat pipe shown in FIG. 4 as a cross section AA in FIG. The thickness of the self-excited vibration heat pipe 12 is set to the order of mm on the basis of thermal conductivity and ease of processing.
　一般的に、自励振動ヒートパイプは流路径が非常に小さいことから、作動液の移動抵抗が粘度上昇の影響を受けやすく、低温環境下での粘度上昇の影響が懸念される。しかし、本実施例のような流路構造では、密閉流路が自励振動ヒートパイプ１２の面内方向に蛇行ターン部分をもたない。このように、自励振動ヒートパイプ１２の密閉流路に蛇行ターン部分が存在しないこと、また流路長が短いことから、一筆書き蛇行流路構造の従来技術に比べて作動液の移動抵抗が小さくなり、気柱と液柱が動きやすくなり、冷却性能の向上が図れる。さらに、本実施例のような流路構造では、一筆書き蛇行流路構造の従来技術に比べて、作動液の移動抵抗を小さくできるため、冷却装置として使用可能な温度範囲が広がる。 Generally, since the self-excited vibration heat pipe has a very small flow path diameter, the movement resistance of the hydraulic fluid is easily affected by the viscosity increase, and there is a concern about the effect of the viscosity increase in a low temperature environment. However, in the flow channel structure as in this embodiment, the closed flow channel does not have a meandering turn portion in the in-plane direction of the self-excited vibration heat pipe 12. As described above, since there is no meandering turn portion in the closed flow path of the self-excited vibration heat pipe 12 and the flow path length is short, the movement resistance of the hydraulic fluid is smaller than that of the prior art with a one-stroke serpentine flow path structure. The air column and the liquid column become easier to move and the cooling performance can be improved. Furthermore, in the flow channel structure as in the present embodiment, the moving resistance of the working fluid can be reduced as compared with the prior art of the one-stroke serpentine flow channel structure, so that the temperature range usable as a cooling device is widened.
　また、作動液の移動抵抗が小さいことから、気泡が振動しづらい小さな発熱量領域でも自励振動ヒートパイプとして動作せしめることができる。これにより、鉄道車両用電力変換装置のように大電力を扱うに当たっては最大熱輸送量を想定するが、惰行時といった発熱量が小さい場合にも対応させることが可能であり、すなわち、発熱量の範囲が広い場合にも適用できる。 Also, since the movement resistance of the hydraulic fluid is small, it can be operated as a self-excited vibration heat pipe even in a small calorific value region where bubbles are difficult to vibrate. As a result, the maximum heat transport amount is assumed when handling large power as in a railway vehicle power converter, but it is possible to cope with a small amount of heat generated during coasting, that is, the amount of heat generated. It can also be applied when the range is wide.
　また、自励振動ヒートパイプは、作動液流路１の周囲の肉厚が薄いため、飛来物の衝突等により破損する可能性が高い。しかし、本実施例のような相互に連通の無い複数の流路を持つ流路構造は、自励振動ヒートパイプ１２のどこか一箇所が破損した場合にも、被害を穴の空いたなどの破損した流路のみにとどめ、残りの流路は、自励振動ヒートパイプとして動作し続けさせることにより、冷却性能の劣化を低減させる役割を果たしている。 Also, since the self-excited vibration heat pipe has a thin wall around the hydraulic fluid flow path 1, it is highly likely to be damaged by a collision of flying objects. However, the flow path structure having a plurality of flow paths that are not in communication with each other as in the present embodiment can be damaged even when one part of the self-excited vibration heat pipe 12 is damaged. Only the damaged flow path is limited, and the remaining flow paths continue to operate as self-excited vibration heat pipes, thereby reducing the deterioration in cooling performance.
　また、本実施例において、冷却性能は、連通のない密閉流路の場合と同等程度である。そのため、流路単位の平均的な冷却性能を見積もることができる。これにより、全流路のうちで破損した流路本数の割合や、流路本数を増減させたときの冷却性能の変化を推定できる。 Further, in this embodiment, the cooling performance is comparable to that of a closed flow path without communication. Therefore, it is possible to estimate the average cooling performance for each channel. Thereby, it is possible to estimate the ratio of the number of broken channels among all the channels and the change in cooling performance when the number of channels is increased or decreased.
　図６は、本実施例における自励振動ヒートパイプが、受熱部と放熱部とを交互に往復する蛇行構造である場合の斜視図である。自励振動ヒートパイプ１２が、受熱部２と放熱部３とを交互に往復するよう蛇行し、波型に折り曲げられた形状である一例を示している。 FIG. 6 is a perspective view in the case where the self-excited vibration heat pipe in this embodiment has a meandering structure in which the heat receiving portion and the heat radiating portion reciprocate alternately. An example is shown in which the self-excited vibration heat pipe 12 meanders so as to alternately reciprocate between the heat receiving portion 2 and the heat radiating portion 3 and is bent into a corrugated shape.
　蛇行ピッチおよび蛇行の幅は、一定であり、受熱部２は、受熱部材１０と接触できるよう平面とする。ここで、蛇行ピッチとは、自励振動ヒートパイプ１２の隣り合う蛇行ターン同士の距離のことをいう。また、蛇行の幅とは、自励振動ヒートパイプ１２の受熱部２から、放熱部３の先端部分までの距離のことをいう。 The meandering pitch and meandering width are constant, and the heat receiving portion 2 is flat so that it can contact the heat receiving member 10. Here, the meandering pitch refers to the distance between adjacent meandering turns of the self-excited vibration heat pipe 12. The meandering width means the distance from the heat receiving portion 2 of the self-excited vibration heat pipe 12 to the tip portion of the heat radiating portion 3.
　放熱部３は、受熱部材と接触している部分以外であり、自励振動ヒートパイプ１２の間に自然対流や車両走行風等を取り込むことにより放熱を行う。 The heat dissipating part 3 is a part other than the part in contact with the heat receiving member, and dissipates heat by taking natural convection, vehicle traveling wind, etc. between the self-excited vibration heat pipes 12.
　以上の構造とすることにより、一つの流路中に複数の受熱部と放熱部とが交互に存在する構造となるため、自励振動ヒートパイプとして動作させることができる。また、自励振動ヒートパイプ１２の受熱部２は、受熱部材１０や発熱体に取り付けやすい構造を有している。 By adopting the above structure, a plurality of heat receiving portions and heat radiating portions are alternately present in one flow path, so that it can be operated as a self-excited vibration heat pipe. In addition, the heat receiving portion 2 of the self-excited vibration heat pipe 12 has a structure that can be easily attached to the heat receiving member 10 or the heating element.
　また、受熱部２と放熱部３との間に、流路外部と受熱も放熱も行わないが熱の輸送は行う断熱部が存在してもよい。受熱部２と放熱部３との間の距離は、作動液の振動により受熱部２の作動液が放熱部３に到達する程度に短い必要がある。 In addition, there may be a heat insulating portion between the heat receiving portion 2 and the heat radiating portion 3 that does not receive heat or radiate heat outside the flow path but transports heat. The distance between the heat receiving part 2 and the heat radiating part 3 needs to be so short that the hydraulic fluid in the heat receiving part 2 reaches the heat radiating part 3 due to the vibration of the hydraulic fluid.
　自励振動ヒートパイプに用いる作動液としては、例えば、水、アルコール類、ブタン等の炭化水素類、ハイドロフルオロカーボン類、ハイドロフルオロエーテル類、ハイドロフルオロオレフィン類、パーフルオロケトン類等を用いる。 As the hydraulic fluid used for the self-excited vibration heat pipe, for example, hydrocarbons such as water, alcohols and butane, hydrofluorocarbons, hydrofluoroethers, hydrofluoroolefins, perfluoroketones and the like are used.
　特に、鉄道車両用電力変換装置の冷却装置に自励振動ヒートパイプを適用する場合に、作動液としては、ハイドロフルオロオレフィン（ＨＦＯ）類であるＲ１３３６ｍｚｚ（Ｚ）が望ましい。以下に、Ｒ１３３６ｍｚｚ（Ｚ）の利点について述べる。 In particular, when applying a self-excited vibration heat pipe to a cooling device for a railway vehicle power converter, R1336mzz (Z), which is a hydrofluoroolefin (HFO), is desirable as the working fluid. The advantages of R1336mzz (Z) are described below.
ａ）Ｒ１３３６ｍｚｚ（Ｚ）は臨界温度が１７０℃程度であることから、パワー半導体モジュール１１を１７０℃程度まで上昇させて使用する際にも、自励振動ヒートパイプ１２の冷却性能を維持することができる。 a) Since the critical temperature of R1336mzz (Z) is about 170 ° C., the cooling performance of the self-excited vibration heat pipe 12 can be maintained even when the power semiconductor module 11 is raised to about 170 ° C. and used. it can.
ｂ）Ｒ１３３６ｍｚｚ（Ｚ）は塩素を含有していないことから、アルミニウム合金に対し化学的に安定しており、自励振動ヒートパイプ１２の材質としてアルミニウム合金を用いる際には、流路内から自励振動ヒートパイプ１２を腐食させることなく、長期間にわたり冷却性能を維持することができる。 b) Since R1336mzz (Z) does not contain chlorine, it is chemically stable with respect to an aluminum alloy. The cooling performance can be maintained for a long time without corroding the excitation vibration heat pipe 12.
ｃ）Ｒ１３３６ｍｚｚ（Ｚ）は不燃性、低毒性であることから、飛来物の衝突等により一部の流路が破損し、作動液が大気中に放出された場合においても安全性を確保することができる。 c) Since R1336mzz (Z) is non-flammable and has low toxicity, safety should be ensured even when a part of the flow path is damaged by the impact of flying objects and the working fluid is released into the atmosphere. Can do.
ｄ）Ｒ１３３６ｍｚｚ（Ｚ）は他の一部の作動液で必要な脱気工程を必要としないため、自励振動ヒートパイプ１２を製造する際の工程を少なくすることができる。 d) Since R1336mzz (Z) does not require a degassing step required for some other hydraulic fluids, the number of steps for manufacturing the self-excited vibration heat pipe 12 can be reduced.
　なお、Ｒ１３３６ｍｚｚ（Ｚ）の代わりに、Ｒ１２２４ｙｄ（Ｚ）、Ｒ１２３４ｙｆ、Ｒ１２３４ｚｅ（Ｅ）、Ｒ１１２３、Ｒ１２３４ｚｅ（Ｚ）、Ｒ１３３６ｍｚｚ（Ｅ）、Ｒ１２３３ｚｄ（Ｚ）またはＲ１２３３ｚｄ（Ｚ）などのＨＦＯ類を用いてもよい。ＨＦＯ類は地球温暖化係数およびオゾン層破壊係数が低いことから、飛来物の衝突等により一部の流路が破損し作動液が大気中に放出された場合においても環境への影響を小さくすることができる。 Instead of R1336mzz (Z), HFOs such as R1224yd (Z), R1234yf, R1234ze (E), R1123, R1234ze (Z), R1336mzz (E), R1233zd (Z) or R1233zd (Z) are used. Also good. Since HFOs have a low global warming potential and ozone depletion potential, the impact on the environment is reduced even when some of the flow paths are damaged by the impact of flying objects and the working fluid is released into the atmosphere. be able to.
　次に、本実施例における冷却装置の動作について説明する。 Next, the operation of the cooling device in the present embodiment will be described.
　パワー半導体素子が動作することによって生じる損失は熱となる。 The loss caused by the operation of the power semiconductor element becomes heat.
　パワー半導体素子から生じた熱は、受熱部材１０を経て自励振動ヒートパイプ１２に伝えられる。 The heat generated from the power semiconductor element is transmitted to the self-excited vibration heat pipe 12 through the heat receiving member 10.
　自励振動ヒートパイプ１２のうち、受熱部材１０と接触している複数箇所の受熱部２で作動液流路１に封入された作動液が突沸して圧力上昇を起こす。それにより作動液が流路内で振動することで、熱は自励振動ヒートパイプ１２の放熱部３の先端へと伝えられる。 In the self-excited vibration heat pipe 12, the hydraulic fluid sealed in the hydraulic fluid flow path 1 bumps at a plurality of heat receiving portions 2 that are in contact with the heat receiving member 10, causing a pressure increase. As a result, the hydraulic fluid vibrates in the flow path, so that heat is transmitted to the tip of the heat radiating portion 3 of the self-excited vibration heat pipe 12.
　さらに、放熱部３にフィン１３が取り付けられている場合、自励振動ヒートパイプ１２からフィン１３に熱が伝えられ、鉄道車両が走行することにより生じる走行風１０１または１０２がフィン１３の間を通過することにより、フィン１３や自励振動ヒートパイプ１２の表面から空気へと放熱される。 Further, when the fins 13 are attached to the heat radiating section 3, heat is transmitted from the self-excited vibration heat pipe 12 to the fins 13, and the traveling wind 101 or 102 generated when the railway vehicle travels passes between the fins 13. By doing so, heat is radiated from the surfaces of the fins 13 and the self-excited vibration heat pipe 12 to the air.
　本実施例の構成により、冷却装置として使用可能な温度範囲および発熱量の範囲が広がるだけでなく、冷却装置の一部が飛来物の衝突等により破損した場合に従来の自励振動ヒートパイプ冷却装置に比べて冷却装置全体の性能劣化を小さくして信頼性を向上させることができる。さらには、流路単位の冷却性能を見積もることができるため、全流路のうち破損した流路本数や、流路本数を変更したときの冷却性能を推定することができる。 The configuration of the present embodiment not only expands the temperature range and heat generation range that can be used as a cooling device, but also conventional cooling of self-excited vibration heat pipes when a part of the cooling device is damaged due to collision of flying objects, etc. It is possible to improve the reliability by reducing the performance degradation of the entire cooling device as compared with the device. Furthermore, since the cooling performance in units of flow paths can be estimated, the number of damaged flow paths among all the flow paths or the cooling performance when the number of flow paths is changed can be estimated.
　本実施例は、実施例１と異なり、独立した密閉流路で作動液流路１をＵ字型としているものである。以下、実施例１との相違点を中心に説明する。 This embodiment is different from the first embodiment in that the hydraulic fluid flow path 1 is U-shaped with an independent sealed flow path. Hereinafter, the difference from the first embodiment will be mainly described.
　図７は、本実施例における、電力変換装置の冷却装置として用いる自励振動ヒートパイプの流路構造を示す概略図である。並列して平行に配置された流路が、自励振動ヒートパイプ１２の長手方向の一方端部で連通されており、略Ｕ字型の密閉流路群が形成されている。 FIG. 7 is a schematic diagram showing a flow path structure of a self-excited vibration heat pipe used as a cooling device of a power conversion device in the present embodiment. The flow paths arranged in parallel in parallel communicate with each other at one end in the longitudinal direction of the self-excited vibration heat pipe 12 to form a substantially U-shaped sealed flow path group.
　なお、作動液流路１の連通箇所は、自励振動ヒートパイプ１２の途中でもよい。また、各密閉流路の連通箇所が統一されていなくてもよい。 In addition, the communicating part of the hydraulic fluid flow path 1 may be in the middle of the self-excited vibration heat pipe 12. Moreover, the communication location of each sealed flow path does not need to be unified.
　さらに、一つの自励振動ヒートパイプ１２の中に、実施例１のような相互に連通の無い１列の密閉流路群と、本実施例のような２列以上で相互に連通された密閉流路群とが混在してもよい。 Further, in one self-excited vibration heat pipe 12, one row of closed flow passage groups that are not in communication with each other as in the first embodiment and two or more rows in the self-excited vibration heat pipe 12 that are in communication with each other in two or more rows. A channel group may be mixed.
　本実施例により、従来技術に比べて、連通している各密閉流路の流路長が短いことから、冷却装置の一部が飛来物の衝突等により破損した場合に、従来の自励振動ヒートパイプ冷却装置に比べて冷却装置全体の性能劣化を低減できる。 According to the present embodiment, since the length of each closed flow channel communicating with each other is shorter than that of the prior art, when a part of the cooling device is damaged due to a collision of a flying object, the conventional self-excited vibration Compared to the heat pipe cooling device, the performance deterioration of the entire cooling device can be reduced.
　同一の密閉流路群を複数含む場合には、流路群単位の冷却性能を見積もることができ、全流路群のうち破損した流路群の数や流路群の数を増減した際の冷却性能を推定できる。 When multiple identical closed flow channel groups are included, the cooling performance of each flow channel group can be estimated, and the number of damaged flow channel groups or the number of flow channel groups among all the flow channel groups can be estimated. Cooling performance can be estimated.
　また、冷却風が出入りする面付近の流路長を短くする等、流路群を構成する流路の列数、流路長および流路群の配置を変更することにより、冷却装置の破損による性能劣化を低減できる。 In addition, by changing the number of rows of channels that make up the flow channel group, the flow channel length, and the arrangement of the flow channel groups, such as shortening the flow channel length near the surface where the cooling air enters and exits, Performance degradation can be reduced.
　本実施例は、実施例１および２に係る自励振動ヒートパイプの製造方法である。 This example is a method for manufacturing a self-excited vibration heat pipe according to Examples 1 and 2.
　図８は、本実施例における、電力変換装置の冷却装置として用いる自励振動ヒートパイプの作動液を封入する前段階までの流路を製造する工程を示す概略図である。以下では、平行に並列して配置された相互に連通の無い複数の密閉された流路を有する自励振動ヒートパイプ１２の流路構造を製造する方法の一例を示す。 FIG. 8 is a schematic diagram showing a process of manufacturing a flow path up to a previous stage in which a working fluid of a self-excited vibration heat pipe used as a cooling device of a power conversion device is sealed in the present embodiment. Below, an example of the method of manufacturing the flow-path structure of the self-excited oscillating heat pipe 12 having a plurality of sealed flow paths that are arranged in parallel and not in communication with each other will be shown.
　図８（ａ）は、本実施例における流路製造の第一工程を示している。まず、長手方向に平行に並列して配置された多数の貫通孔３１を有する多穴管３０を準備する。 FIG. 8A shows the first step of the flow path manufacturing in the present embodiment. First, a multi-hole tube 30 having a large number of through holes 31 arranged in parallel in the longitudinal direction is prepared.
　図８（ｂ）は、本実施例における流路製造の第二工程を示している。多穴管３０の一端を、多穴管３０と同じ厚みと幅を持つ、板状または角状の封止部材３２を、ロウ付けまたは溶接等の接合手段により接合し、封止する。または、多穴管３０の一端を圧潰することにより封止してもよい。 FIG. 8B shows the second step of the flow path manufacturing in the present example. One end of the multi-hole tube 30 is sealed by joining a plate-shaped or square-shaped sealing member 32 having the same thickness and width as the multi-hole tube 30 by a joining means such as brazing or welding. Alternatively, sealing may be performed by crushing one end of the multi-hole tube 30.
　図８（ｃ）は、本実施例における流路製造の第三工程を示している。封止部材３２と反対側の流路端において、各流路を隔てる仕切り部４の一部を隣接する流路同士が連通するように除去し、連通流路３４を形成する。 FIG. 8C shows the third step of the flow path manufacturing in the present example. At the end of the flow path opposite to the sealing member 32, a part of the partition portion 4 separating each flow path is removed so that adjacent flow paths communicate with each other, thereby forming a communication flow path 34.
　図８（ｄ）は、本実施例における流路製造の第四工程を示している。自励振動ヒートパイプの両端のうち作動液の封入口とする側に、多穴管３０と同じ厚みと幅を持つ板状または角状の封止部材３３を、ロウ付けまたは溶接等の接合手段により接合して、連通流路３４を含むヘッダ部３５を形成する。 FIG. 8D shows the fourth step of the flow path manufacturing in the present example. A plate-shaped or square-shaped sealing member 33 having the same thickness and width as the multi-hole tube 30 is attached to the side of the both ends of the self-excited vibration heat pipe as the working fluid sealing port, and joining means such as brazing or welding. To form a header portion 35 including the communication flow path 34.
　図８（ｅ）は、本実施例における流路製造の第五工程を示している。ヘッダ部３５に作動液封入口５を取り付ける。作動液封入口５は、流路径と同等の径を持つ中空管であり、連通流路３４と連通する。連通流路３４と連通するのであれば、流路の一つを延長させたものでもよい。 FIG. 8 (e) shows the fifth step of the flow path manufacturing in the present embodiment. The hydraulic fluid filling port 5 is attached to the header part 35. The hydraulic fluid sealing port 5 is a hollow tube having a diameter equivalent to the channel diameter, and communicates with the communication channel 34. As long as it communicates with the communication channel 34, one of the channels may be extended.
　ここで、上記した第四および第五工程を、多穴管３０に対して、作動液封入口が既に取り付けられた状態の封止部材を溶接し、連通流路３４を含むヘッダ部３５を形成する工程に置き換えてもよい。 Here, the above-described fourth and fifth steps are welded to the multi-hole tube 30 in a state where the hydraulic fluid sealing port is already attached to form the header portion 35 including the communication channel 34. It may be replaced with the process of.
　特許文献１に記載される蛇行流路の製造方式では、多穴管の両端の各流路を隔てる仕切り部の一部を一つおきに除去する工程が含まれる。 The manufacturing method of the meandering flow path described in Patent Document 1 includes a step of removing every other part of the partition that separates the flow paths at both ends of the multi-hole tube.
　一方、本実施例における流路製造方法では、各流路を隔てる隔壁の一部を除去する必要がある部分は、多穴管の片側のみであり、また、連通流路３４の製造時には、多穴管の流路の一列目と最終列の内側の隔壁をすべて除去すればよい。 On the other hand, in the flow path manufacturing method according to the present embodiment, a part of the partition wall that separates the flow paths needs to be removed only on one side of the multi-hole tube. All the partition walls inside the first row and the last row of the channel of the hole tube may be removed.
　以上のように、本実施例における流路製造方法は、特許文献１よりも流路製造が容易であるため、コストと時間を抑えられる。 As described above, since the flow path manufacturing method in the present embodiment is easier to manufacture than in Patent Document 1, the cost and time can be reduced.
　また、連通流路３４の先に作動液封入口５を設けることにより、一度にすべての流路に作動液を封入できる。 Also, by providing the working fluid sealing port 5 at the tip of the communication channel 34, the working fluid can be sealed in all the channels at once.
　連通流路３４と連通している各流路長が等しい場合、すべての流路に一様に作動液を流し込むことができ、冷却装置として動作する際に、各流路の冷却性能を同等にせしめる。 When the length of each flow path communicating with the communication flow path 34 is equal, the working fluid can be poured uniformly into all the flow paths, and the cooling performance of each flow path is equalized when operating as a cooling device. Let me.
　さらに、流路長が短いため、特許文献１よりも短時間で作動液の封入作業を終えることができる。 Furthermore, since the flow path length is short, the hydraulic fluid sealing operation can be completed in a shorter time than in Patent Document 1.
　次に、図８で示す流路製造の工程により製造した自励振動ヒートパイプを用いて冷却装置を製造する際の工程の一例を示す。 Next, an example of a process for manufacturing a cooling device using the self-excited vibration heat pipe manufactured by the flow path manufacturing process shown in FIG. 8 will be described.
　第一の工程として、自励振動ヒートパイプ１２に対して、往復幅やピッチを等しくし、かつ受熱部材と接触するための平面を有するように、複数回蛇行させる形に曲げる。 As a first step, the self-excited vibration heat pipe 12 is bent into a meandering shape a plurality of times so as to have the same reciprocal width and pitch and a flat surface for contacting the heat receiving member.
　第二の工程として、自励振動ヒートパイプ１２の受熱部を形成する片方の先端部に受熱部材１０を接触させ、自励振動ヒートパイプ間にフィン１３を取り付ける。 As a second step, the heat receiving member 10 is brought into contact with one end portion forming the heat receiving portion of the self-excited vibration heat pipe 12 and the fins 13 are attached between the self-excited vibration heat pipes.
　第三の工程として、作動液封入口５を通じて自励振動ヒートパイプ１２の流路内に作動液を必要量封入する。 As a third step, a required amount of hydraulic fluid is sealed in the flow path of the self-excited vibration heat pipe 12 through the hydraulic fluid sealing port 5.
　図９は、上記した自励振動ヒートパイプを用いて冷却装置を製造する工程の第四および第五の工程に関し、図８のＢ－Ｂ断面を示す図である。図９では、前記第三の工程を経てヘッダ部３５において作動液流路を封止した後に、相互に連通の無い複数の密閉流路を製造する場合の工程を示す。 FIG. 9 is a cross-sectional view taken along the line BB of FIG. 8, regarding the fourth and fifth steps of manufacturing the cooling device using the self-excited vibration heat pipe. In FIG. 9, after sealing the hydraulic fluid flow path in the header portion 35 through the third process, a process in the case of manufacturing a plurality of sealed flow paths that do not communicate with each other is shown.
　図９（ａ）および（ｂ）は、上記した冷却装置製造の第四の工程を示している。（ａ）に示すように、ヘッダ部３５を連通流路３４のすべてが潰れるように、連通流路の圧潰位置３６において、万力等の工具により圧潰する。圧潰したヘッダ部３５は、（ｂ）に示すような形状となる。 FIGS. 9A and 9B show the fourth step of manufacturing the cooling device described above. As shown to (a), the header part 35 is crushed with tools, such as a vise, in the crushing position 36 of a communication flow path so that all the communication flow paths 34 may be crushed. The crushed header portion 35 has a shape as shown in FIG.
　図９（ｃ）および（ｄ）は、上記した冷却装置製造の第五の工程を示している。（ｃ）に示すように、圧潰したヘッダ部３５を内側へ折り曲げ、自励振動ヒートパイプ１２の端に近い、折り曲げた後の圧潰位置３７で圧潰する。最終的に、圧潰したヘッダ部の形状は、（ｄ）のようになる。なお、作動液封入口５（図示せず）は、折り曲げて圧潰する前または後に除去する。 FIGS. 9C and 9D show the fifth step of manufacturing the cooling device described above. As shown in (c), the crushed header portion 35 is folded inward, and is crushed at the crushing position 37 after being folded, close to the end of the self-excited vibration heat pipe 12. Finally, the shape of the crushed header part is as shown in (d). The hydraulic fluid filling port 5 (not shown) is removed before or after being bent and crushed.
　以上のとおり、冷却装置を製造する際に、流路端を圧潰し、折り曲げた後再び圧潰することにより、流路の密閉性が高くなり、流路端からの冷媒漏れを防ぐ構造とすることができる。 As described above, when the cooling device is manufactured, the end of the flow path is crushed, folded, and then crushed again, thereby improving the sealing performance of the flow path and preventing refrigerant leakage from the flow path end. Can do.
　なお、上記した流路製造の方法および冷却装置製造の方法のすべてあるいは一部を、相互に連通のある複数の流路群（実施例２の流路構造）を製造する際に適用してもよい。 Note that all or part of the above-described channel manufacturing method and cooling device manufacturing method may be applied when manufacturing a plurality of channel groups (channel structure of Example 2) that are in communication with each other. Good.
　本実施例により、流路製造時に高い技術を必要としないため時間とコストを抑えることができ、連通流路により作動液の封入回数を減らすことができる。また、冷却装置製造の際に、流路端を圧潰し折り曲げて再び圧潰することにより、流路の密閉性が高くなり、流路端からの冷媒漏れを防ぐことができる。 The present embodiment does not require a high level of technology when manufacturing the flow path, so the time and cost can be reduced, and the number of times the hydraulic fluid is sealed can be reduced by the communication flow path. Further, when the cooling device is manufactured, the end of the flow path is crushed, bent, and then crushed again, so that the airtightness of the flow path is improved and refrigerant leakage from the flow path end can be prevented.
　本実施例は、実施例３と異なり、作動液の封入口側の端部を、作動液封入口および連通流路付きの封止部材により封止する自励振動ヒートパイプの製造方法である。以下、実施例１乃至３との相違点を中心に説明する。 Unlike the third embodiment, the present embodiment is a method of manufacturing a self-excited vibration heat pipe in which the end portion on the side of the hydraulic fluid sealing port is sealed with a hydraulic fluid sealing port and a sealing member with a communication channel. Hereinafter, the difference from the first to third embodiments will be mainly described.
　図１０は、本実施例における、電力変換装置の冷却装置として用いる自励振動ヒートパイプの作動液を封入する前段階までの流路製造の工程を示す概略図である。 FIG. 10 is a schematic diagram showing the flow path manufacturing process up to the previous stage in which the working fluid of a self-excited vibration heat pipe used as a cooling device of the power conversion device in this embodiment is sealed.
　図１０（ａ）および（ｂ）は、本実施例における流路製造の第一および第二工程を示している。両工程は、実施例３の第一および第二工程と同様である。 10 (a) and 10 (b) show the first and second steps of the flow channel manufacturing in the present embodiment. Both steps are the same as the first and second steps of Example 3.
　図１０（ｃ）および（ｄ）は、本実施例における流路製造の第三工程を示している。作動液の封入口５側の端部を、多穴管と材質、厚みおよび幅が同じで、作動液封入口および連通流路付きの封止部材３８により封止して、連通流路３４を含むヘッダ部を形成する。作動液封入口および連通流路付きの封止部材３８は、板型または角型の部材から連通流路部分を除去する等の方法によって製造する。 10 (c) and 10 (d) show a third step of the flow path manufacturing in the present embodiment. The end portion on the side of the hydraulic fluid sealing port 5 is the same in material, thickness and width as the multi-hole tube, and is sealed by a sealing member 38 having a hydraulic fluid sealing port and a communication channel. Forming a header portion including The sealing member 38 with the hydraulic fluid sealing port and the communication channel is manufactured by a method such as removing the communication channel portion from a plate-shaped or rectangular member.
　本実施例により、流路製造時に、実施例３と比べて流路間の隔壁を除去する工程（実施例３の第三工程）を省くことができ、接合のみによって構成される。これにより、時間とコストを抑えることができ、連通流路により作動液を封入する回数を減らすことができる。また、連通流路を形成した部材を接合するため、連通流路径が一定となり、作動液を各流路に封入する際に、流路間の作動液封入率のばらつきが小さくなる。 According to the present embodiment, the step of removing the partition walls between the flow paths (third process of the third embodiment) can be omitted at the time of manufacturing the flow path as compared with the third embodiment, and the process is configured only by joining. Thereby, time and cost can be suppressed, and the number of times the hydraulic fluid is sealed by the communication channel can be reduced. Further, since the members that form the communication flow path are joined, the communication flow path diameter is constant, and when the hydraulic fluid is sealed in each flow path, the variation in the hydraulic fluid filling rate between the flow paths is reduced.
　本実施例は、自励振動ヒートパイプを受熱部材に支持する構造に特徴を有する。以下、実施例１乃至４との相違点を中心に説明する。 This embodiment is characterized by a structure in which a self-excited vibration heat pipe is supported by a heat receiving member. Hereinafter, the difference from the first to fourth embodiments will be mainly described.
　図１１は、本実施例における、冷却装置を含めた電力変換装置の構造を示す斜視図であり、自励振動ヒートパイプの作動液封入口側の端部構造の一例を示している。自励振動ヒートパイプ１２の作動液封入口５を設けた側の端部を、受熱部材１０の端部からはみ出す程度に長くして設置している。 FIG. 11 is a perspective view showing the structure of the power conversion device including the cooling device in this embodiment, and shows an example of the end portion structure of the self-excited vibration heat pipe on the side of the hydraulic fluid filling port. The end of the self-excited vibration heat pipe 12 on the side where the hydraulic fluid sealing port 5 is provided is set long enough to protrude from the end of the heat receiving member 10.
　以上のとおり、自励振動ヒートパイプ１２の作動液封入側の一端を、受熱部材１０からはみ出す程度に長くした形状とすることにより、自励振動ヒートパイプ１２の作動液封入口５を設けた側の端部を圧潰や接合により作業する際に、作業工具を用いるための空間を確保できる。これにより、冷却装置を含めた電力変換装置を製造する時の時間とコストを抑えることができる。 As described above, the side of the self-excited vibration heat pipe 12 on which the hydraulic fluid is sealed is made long enough to protrude from the heat receiving member 10, whereby the side of the self-excited vibration heat pipe 12 on which the hydraulic fluid sealing port 5 is provided. When working the end portion of the tool by crushing or joining, a space for using the work tool can be secured. Thereby, the time and cost when manufacturing the power converter device including a cooling device can be held down.
　本実施例は、実施例５と異なり、自励振動ヒートパイプの作動液封入側の一端が、受熱部材から浮き上がるように折り曲げられた形状であることを特徴とする。以下、実施例１乃至５との相違点を中心に説明する。 Unlike the fifth embodiment, the present embodiment is characterized in that one end of the self-excited vibration heat pipe on the side where the hydraulic fluid is sealed is bent so as to be lifted from the heat receiving member. Hereinafter, the difference from the first to fifth embodiments will be mainly described.
　図１２は、本実施例における、冷却装置を含めた電力変換装置の構造を示す斜視図であり、本実施例における自励振動ヒートパイプの作動液封入口側の端部構造の一例を示している。自励振動ヒートパイプ１２の作動液封入口５を設けた側の端部を、受熱部材１０から離れる方向として受熱部材１０と垂直方向に一回曲げ、さらに受熱部材１０と並行方向に一回曲げることにより、作動液封入口５を設けた側の端部を受熱部材１０から浮かせた構造にしている。 FIG. 12 is a perspective view showing the structure of the power conversion device including the cooling device in the present embodiment, showing an example of the end portion structure on the side of the hydraulic fluid sealing port of the self-excited vibration heat pipe in the present embodiment. Yes. The end of the self-excited vibration heat pipe 12 on the side where the hydraulic fluid sealing port 5 is provided is bent once in a direction perpendicular to the heat receiving member 10 as a direction away from the heat receiving member 10, and further bent once in a direction parallel to the heat receiving member 10. Accordingly, the end portion on the side where the hydraulic fluid sealing port 5 is provided is made to float from the heat receiving member 10.
　以上のとおり、自励振動ヒートパイプの作動液封入側の一端を、受熱部材から浮き上がるように折り曲げた形状とすることにより、自励振動ヒートパイプ１２の作動液封入口５を設けた側の端部を圧潰や接合により作業する際に、作業工具を用いるための空間を確保できる。これにより、冷却装置を含めた電力変換装置を製造する時の時間とコストを抑えることができる。 As described above, the end of the self-excited vibration heat pipe on the side where the hydraulic fluid is sealed is shaped so as to be lifted from the heat receiving member, so that the end of the self-excited vibration heat pipe 12 on the side where the hydraulic fluid is sealed is provided. When working the parts by crushing or joining, a space for using the work tool can be secured. Thereby, the time and cost when manufacturing the power converter device including a cooling device can be held down.
　本実施例は、実施例５および６と異なり、受熱部材が、自励振動ヒートパイプの作動液封入側の一端の周辺を切り欠いた構造であることを特徴とする。以下、実施例１乃至６との相違点を中心に説明する。 Unlike the fifth and sixth embodiments, the present embodiment is characterized in that the heat receiving member has a structure in which the periphery of one end of the self-excited vibration heat pipe on the hydraulic fluid sealing side is cut out. Hereinafter, the difference from the first to sixth embodiments will be mainly described.
　図１３は、本実施例における、冷却装置を含めた電力変換装置の構造を示す斜視図であり、自励振動ヒートパイプを支持する受熱部材の構造の一例を示している。受熱部材１０の作動液封入口５を設けた側の端部周辺を切り欠いた構造としている。 FIG. 13 is a perspective view showing the structure of the power conversion device including the cooling device in this embodiment, and shows an example of the structure of the heat receiving member that supports the self-excited vibration heat pipe. The heat receiving member 10 has a structure in which the periphery of the end portion on the side where the hydraulic fluid sealing port 5 is provided is cut out.
　以上のとおり、受熱部材１０が、自励振動ヒートパイプ１２の作動液封入側の一端の周辺が切り欠いた構造であることにより、作動液封入口５を設けた側の自励振動ヒートパイプ１２の端部を圧潰や接合により作業をする際に、作業工具を用いるための空間を確保できる。これにより、冷却装置を含めた電力変換装置を製造する時の時間とコストを抑えることができる。 As described above, the heat receiving member 10 has a structure in which the periphery of one end of the self-excited vibration heat pipe 12 on the hydraulic fluid enclosure side is cut out, so that the self-excited vibration heat pipe 12 on the side where the hydraulic fluid enclosure port 5 is provided. When working the end portion of the tool by crushing or joining, a space for using the work tool can be secured. Thereby, the time and cost when manufacturing the power converter device including a cooling device can be held down.
　本実施例は、実施例５乃至７と異なり、自励振動ヒートパイプの作動液封入側の端部が、受熱部材の受熱面から鉛直上向きの構造であることを特徴とする。以下、実施例１乃至７との相違点を中心に説明する。 Unlike the fifth to seventh embodiments, the present embodiment is characterized in that the end portion of the self-excited vibration heat pipe on the hydraulic fluid sealing side has a vertically upward structure from the heat receiving surface of the heat receiving member. Hereinafter, the difference from the first to seventh embodiments will be mainly described.
　図１４は、本実施例における、冷却装置を含めた電力変換装置の構造を示す斜視図であり、自励振動ヒートパイプの構造と受熱部材との位置関係を示している。 FIG. 14 is a perspective view showing the structure of the power conversion device including the cooling device in the present embodiment, and shows the positional relationship between the structure of the self-excited vibration heat pipe and the heat receiving member.
　自励振動ヒートパイプ１２の端部は、放熱部側に設けられ、作動液封入口５は、自励振動ヒートパイプ１２の端部の先に受熱部材１０と反対方向に設置されている。作動液封入口５は、放熱部側であれば、自励振動ヒートパイプ１２のどの位置に取り付けられてもよい。 The end portion of the self-excited vibration heat pipe 12 is provided on the heat radiating portion side, and the hydraulic fluid filling port 5 is installed in the opposite direction to the heat receiving member 10 at the end of the end portion of the self-excited vibration heat pipe 12. The hydraulic fluid sealing port 5 may be attached to any position of the self-excited vibration heat pipe 12 as long as it is on the heat radiating portion side.
　以上のとおり、自励振動ヒートパイプの作動液封入側の端部が、受熱部分から鉛直上向きに浮き上がった構造であることにより、作動液封入口５を設けた側の自励振動ヒートパイプ１２の端部を圧潰や接合により作業をする際に、作業工具を用いるための空間を確保できる。これにより、冷却装置を含めた電力変換装置を製造する時の時間とコストを抑えることができる。 As described above, the end portion of the self-excited vibration heat pipe on the side where the hydraulic fluid is encapsulated is lifted vertically upward from the heat receiving portion, so that the self-excited oscillation heat pipe 12 on the side where the hydraulic fluid enclosure port 5 is provided. When working the ends by crushing or joining, a space for using the work tool can be secured. Thereby, the time and cost when manufacturing the power converter device including a cooling device can be held down.
　本実施例は、実施例１と異なり、独立した密閉流路で作動液流路１の一部が連通されていることを特徴とする。以下、実施例１との相違点を中心に説明する。 Unlike the first embodiment, this embodiment is characterized in that a part of the hydraulic fluid channel 1 is communicated with an independent sealed channel. Hereinafter, the difference from the first embodiment will be mainly described.
　図１５は、本実施例における、電力変換装置の冷却装置として用いる自励振動ヒートパイプの流路構造を示す概略図である。 FIG. 15 is a schematic diagram showing a flow path structure of a self-excited vibration heat pipe used as a cooling device for a power conversion device in the present embodiment.
　平行して並列に配置された作動液流路１が、自励振動ヒートパイプ１２の長手方向の両側端部で連通され、２列以上の作動液流路１から成る密閉流路群を形成し、この密閉流路群を並列に複数配置することにより、一つの自励振動ヒートパイプ１２の内部に複数の密閉流路群を形成する。 The hydraulic fluid channels 1 arranged in parallel in parallel communicate with each other at both ends in the longitudinal direction of the self-excited vibration heat pipe 12 to form a sealed channel group composed of two or more rows of hydraulic fluid channels 1. By arranging a plurality of these closed flow channel groups in parallel, a plurality of closed flow channel groups are formed inside one self-excited vibration heat pipe 12.
　なお、作動液流路１の連通箇所は、図１５に示すように両端に限らず片端でもよく、自励振動ヒートパイプ１２の途中でもよい。また、各密閉流路の連通箇所が統一されていなくてもよい。 In addition, as shown in FIG. 15, the communication location of the hydraulic fluid flow path 1 is not limited to both ends, and may be one end or the middle of the self-excited vibration heat pipe 12. Moreover, the communication location of each sealed flow path does not need to be unified.
　さらに、一つの自励振動ヒートパイプ１２の中に、実施例１のような相互に連通の無い１列の密閉流路と、本実施例のような２列以上で相互に連通された密閉流路群とが混在してもよい。 Furthermore, in one self-excited vibration heat pipe 12, one row of closed flow paths that are not in communication with each other as in the first embodiment and a closed flow in which two or more rows are in communication with each other as in this embodiment. A road group may be mixed.
　本実施例により、従来技術に比べて流路長が短いことから、冷却装置の一部が飛来物の衝突等により破損した場合に、従来の自励振動ヒートパイプ冷却装置に比べて冷却装置全体の性能劣化を小さくできる。 According to this embodiment, since the flow path length is shorter than that of the prior art, when a part of the cooling device is damaged due to collision of flying objects, the entire cooling device is compared with the conventional self-excited vibration heat pipe cooling device. Performance degradation can be reduced.
　また、同一の密閉流路群を複数含む場合には、流路群単位の冷却性能を見積もることができ、さらに、全流路群のうち破損した流路群の数や流路群の数を増減した際の冷却性能を推定できる。 In addition, in the case of including a plurality of the same sealed flow path groups, it is possible to estimate the cooling performance of each flow path group, and further, the number of damaged flow path groups or the number of flow path groups among all flow path groups can be calculated. The cooling performance when increasing or decreasing can be estimated.
　ここで、冷却性能に関しては、少なくとも隣り合う流路との連通部分を有することから、単体の密閉流路に限ってみると連通のない構造の実施例１と比べて、飛来物の衝突等により破損した際の冷却性能の若干の劣化は免れないが、同じ面積当たりでは、並列する流路本数を多く取ることができることから、全体的には実施例１と大差ない冷却性能を得ることができる。また、一筆書き蛇行流路構造の従来技術に比べて、依然として流路長が短く、作動液の移動抵抗が小さいことから、冷却装置として使用可能な温度範囲を広く取ることができる。 Here, with regard to the cooling performance, since it has at least a communication portion with the adjacent flow path, when limited to a single sealed flow path, compared with Example 1 having a structure without communication, due to collision of flying objects, etc. Although some deterioration of the cooling performance at the time of breakage is inevitable, since the number of parallel flow paths can be increased per unit area, it is possible to obtain a cooling performance that is not significantly different from that of the first embodiment. . In addition, since the flow path length is still short and the hydraulic fluid movement resistance is small compared to the prior art with a one-stroke serpentine flow path structure, the temperature range usable as a cooling device can be widened.
　さらに、冷却風が出入りする面付近の流路長を短くするなど、流路群を構成する流路の列数、流路長や流路群の配置を変更することにより、冷却装置の破損による性能劣化を小さくできる。 Furthermore, by changing the number of rows of channels that make up the channel group, the channel length, and the arrangement of the channel group, such as shortening the channel length near the surface where the cooling air enters and exits, the cooling device may be damaged. Performance degradation can be reduced.
　図１６は、本実施例における、電力変換装置の冷却装置として用いる自励振動ヒートパイプの流路構造を示す概略図である。 FIG. 16 is a schematic diagram showing a flow path structure of a self-excited vibration heat pipe used as a cooling device for a power conversion device in the present embodiment.
　本実施例は、実施例９と異なり、一つの自励振動ヒートパイプ１２の内部で、平行して並列に配置される作動液流路１が、自励振動ヒートパイプ１２の長手方向の両側端部で２列以上連通されて一つの密閉流路を形成し、この自励振動ヒートパイプ１２を複数個設置したものである。 In the present embodiment, unlike the ninth embodiment, the hydraulic fluid flow paths 1 arranged in parallel in one self-excited oscillating heat pipe 12 are arranged at both ends in the longitudinal direction of the self-excited oscillating heat pipe 12. Two or more rows communicate with each other to form one sealed flow path, and a plurality of self-excited vibration heat pipes 12 are installed.
　なお、作動液流路１の連通箇所は、図１６に示すように両端に限らず片端でもよく、自励振動ヒートパイプ１２の途中でもよい。また、各密閉流路の連通箇所が統一されていなくてもよい。 In addition, the communication location of the hydraulic fluid flow path 1 is not limited to both ends as shown in FIG. 16, and may be one end or in the middle of the self-excited vibration heat pipe 12. Moreover, the communication location of each sealed flow path does not need to be unified.
　さらに、複数個設置した自励振動ヒートパイプ１２の中に、実施例１のような相互に連通の無い１列の密閉流路を複数配置した自励振動ヒートパイプ１２と、本実施例のような２列以上で相互に連通された密閉流路群を有する自励振動ヒートパイプ１２とが混在してもよい。 Further, the self-excited vibration heat pipe 12 in which a plurality of self-excited vibration heat pipes 12 are arranged with a plurality of one-line closed flow paths that are not in communication with each other as in the first embodiment, as in the present embodiment. Such self-excited vibration heat pipes 12 having a group of sealed flow paths communicating with each other in two or more rows may be mixed.
　本実施例により、従来技術に比べて流路長が短いことから、冷却装置の一部が飛来物の衝突等により破損した場合に、従来の自励振動ヒートパイプ冷却装置に比べて冷却装置全体の性能劣化を小さくできる。 According to this embodiment, since the flow path length is shorter than that of the prior art, when a part of the cooling device is damaged due to collision of flying objects, the entire cooling device is compared with the conventional self-excited vibration heat pipe cooling device. Performance degradation can be reduced.
　また、同一の密閉流路群を有する自励振動ヒートパイプ２を複数個備える場合には、自励振動ヒートパイプ単位の冷却性能を見積もることができ、全ての自励振動ヒートパイプのうち破損した自励振動ヒートパイプの数や自励振動ヒートパイプの数を増減した際の冷却性能を推定できる。 In addition, when a plurality of self-excited vibration heat pipes 2 having the same closed flow path group are provided, the cooling performance of each self-excited vibration heat pipe can be estimated, and all of the self-excited vibration heat pipes are damaged. It is possible to estimate the cooling performance when the number of self-excited vibration heat pipes or the number of self-excited vibration heat pipes is increased or decreased.
　ここで、冷却性能に関しては、少なくとも隣り合う流路との連通部分を有することから、単体の密閉流路に限ってみると連通のない構造の実施例１と比べて、飛来物の衝突等により破損した際の冷却性能の若干の劣化は免れないが、同じ面積当たりでは、並列する流路本数を多く取ることができることから、全体的には実施例１と大差ない冷却性能を得ることができる。また、一筆書き蛇行流路構造の従来技術に比べて、依然として流路長が短く、作動液の移動抵抗が小さいことから、冷却装置として使用可能な温度範囲を広く取ることができる。さらに、単体の自励振動ヒートパイプ１２が、実施例１や実施例９に比べてコンパクトなサイズとなることから、設置箇所のスペースに柔軟に対処することが可能である。 Here, with regard to the cooling performance, since it has at least a communication portion with the adjacent flow path, when limited to a single sealed flow path, compared with Example 1 having a structure without communication, due to collision of flying objects, etc. Although some deterioration of the cooling performance at the time of breakage is inevitable, since the number of parallel flow paths can be increased per unit area, it is possible to obtain a cooling performance that is not significantly different from that of the first embodiment. . In addition, since the flow path length is still short and the hydraulic fluid movement resistance is small compared to the prior art with a one-stroke serpentine flow path structure, the temperature range usable as a cooling device can be widened. Furthermore, since the single self-excited vibration heat pipe 12 has a compact size as compared with the first and ninth embodiments, it is possible to flexibly cope with the space at the installation location.
　また、冷却風が出入りする面付近の流路長を短くするなど、流路群を構成する流路の列数、流路長や流路群の配置を変更することにより、冷却装置の破損による性能劣化を小さくできる。 In addition, due to damage to the cooling device by changing the number of rows of channels that make up the flow channel group, the length of the flow channel, and the arrangement of the flow channel group, such as shortening the flow channel length near the surface where the cooling air enters and exits Performance degradation can be reduced.
　１：作動液流路
　２：受熱部
　３：放熱部
　４：仕切り部
　５：作動液封入口
　１０：受熱部材
　１１：パワー半導体モジュール
　１２：自励振動ヒートパイプ
　１３：フィン
　２０：電気部品
　２１：インバータ箱
　３０：多穴管
　３１：貫通孔
　３２：封止部材
　３３：作動液封入口側の封止部材 
　３４：連通流路
　３５：ヘッダ部
　３６：連通流路の圧潰位置
　３７：折り曲げた後の圧潰位置
　３８：作動液封入口および連通流路付き封止部材
　１０１、１０２：走行風の方向
　２００：鉄道車両 DESCRIPTION OF SYMBOLS 1: Hydraulic fluid flow path 2: Heat receiving part 3: Heat radiation part 4: Partition part 5: Hydraulic fluid enclosure 10: Heat receiving member 11: Power semiconductor module 12: Self-excited vibration heat pipe 13: Fin 20: Electrical component 21: Inverter Box 30: Multi-hole tube 31: Through hole 32: Sealing member 33: Sealing member on the hydraulic fluid sealing port side
34: Communication flow path 35: Header part 36: Crushing position of communication flow path 37: Crushing position after bending 38: Sealing member with hydraulic fluid filling port and communication flow path 101, 102: Direction of traveling wind 200: Railway vehicle

Claims (23)

  1. 　電力変換回路を構成する半導体素子と、
    　前記半導体素子から発生する熱を冷却する冷却装置と
    を備える電力変換装置において、
    　前記冷却装置は、自励振動ヒートパイプを用いて構成され、
    　前記自励振動ヒートパイプは、並列に配置された複数の密閉流路を有する
    ことを特徴とする電力変換装置。     A semiconductor element constituting a power conversion circuit;
    In a power converter comprising a cooling device that cools heat generated from the semiconductor element,
    The cooling device is configured using a self-excited vibration heat pipe,
    The self-excited vibration heat pipe has a plurality of sealed flow paths arranged in parallel.
  2. 　請求項１に記載された電力変換装置において、
    　前記複数の密閉流路が、前記自励振動ヒートパイプの長手方向に平行な直線形状である
    ことを特徴とする電力変換装置。     In the power converter device described in Claim 1,
    The plurality of closed flow paths are linearly parallel to the longitudinal direction of the self-excited vibration heat pipe.
  3. 　請求項１または２に記載された電力変換装置において、
    　前記複数の密閉流路は、連通された密閉流路である
    ことを特徴とする電力変換装置。     In the power converter device according to claim 1 or 2,
    The power conversion device, wherein the plurality of sealed flow paths are connected closed flow paths.
  4. 　請求項３に記載された電力変換装置において、
    　前記自励振動ヒートパイプは、前記連通された密閉流路を密閉流路群として並列に複数配置する
    ことを特徴とする電力変換装置。     In the power converter device according to claim 3,
    A plurality of the self-excited vibration heat pipes are arranged in parallel with the connected closed flow paths as a closed flow path group.
  5. 　請求項３に記載された電力変換装置において、
    　前記冷却装置は、前記連通された密閉流路を有する前記自励振動ヒートパイプを複数個備える
    ことを特徴とする電力変換装置。     In the power converter device according to claim 3,
    The cooling apparatus includes a plurality of the self-excited vibration heat pipes having the communicated closed flow paths.
  6. 　請求項１に記載された電力変換装置において、
    　前記複数の密閉流路は、前記自励振動ヒートパイプの長手方向にＵ字形状である
    ことを特徴とする電力変換装置。     In the power converter device described in Claim 1,
    The plurality of sealed flow paths are U-shaped in a longitudinal direction of the self-excited vibration heat pipe.
  7. 　請求項１～６のいずれか１項に記載された電力変換装置において、
    　前記複数の密閉流路は、前記自励振動ヒートパイプの長手方向に同じ長さである
    ことを特徴とする電力変換装置。     The power conversion device according to any one of claims 1 to 6,
    The plurality of sealed flow paths have the same length in the longitudinal direction of the self-excited vibration heat pipe.
  8. 　請求項１～７のいずれか１項に記載された電力変換装置において、
    　前記自励振動ヒートパイプは、自らの長手方向の一端が圧潰された構造を有する
    ことを特徴とする電力変換装置。     The power conversion device according to any one of claims 1 to 7,
    The self-excited vibration heat pipe has a structure in which one end in the longitudinal direction thereof is crushed.
  9. 　請求項１～８のいずれか１項に記載された電力変換装置において、
    　前記自励振動ヒートパイプが、自らの長手方向に波型に折り曲げられた構造を有する
    ことを特徴とする電力変換装置。     The power conversion device according to any one of claims 1 to 8,
    The self-excited vibration heat pipe has a structure that is bent into a wave shape in its longitudinal direction.
  10. 　請求項９に記載された電力変換装置において、
    　自らの長手方向に波型に折り曲げられた前記自励振動ヒートパイプを支持ずる受熱部材を備え、
    　前記自励振動ヒートパイプの作動液封入側となる前記自励振動ヒートパイプの長手方向の一端が、前記受熱部材の端部からはみ出す長さを有する
    ことを特徴とする電力変換装置。     The power conversion device according to claim 9, wherein
    A heat-receiving member that supports the self-excited vibration heat pipe bent in a wave shape in its longitudinal direction;
    The power converter according to claim 1, wherein one end of the self-excited vibration heat pipe on the side of the hydraulic fluid enclosing side of the self-excited vibration heat pipe has a length protruding from an end of the heat receiving member.
  11. 　請求項９に記載された電力変換装置において、
    　自らの長手方向に波型に折り曲げられた前記自励振動ヒートパイプを支持する受熱部材を備え、
    　前記自励振動ヒートパイプの作動液封入側となる前記自励振動ヒートパイプの長手方向の一端が、前記受熱部材から浮き上がった折り曲げ構造を有する
    ことを特徴とする電力変換装置。     The power conversion device according to claim 9, wherein
    A heat receiving member that supports the self-excited vibration heat pipe bent in a wave shape in its longitudinal direction;
    One end of the self-excited vibration heat pipe in the longitudinal direction on the hydraulic fluid enclosing side of the self-excited vibration heat pipe has a bent structure that is lifted from the heat receiving member.
  12. 　請求項９に記載された電力変換装置において、
    　自らの長手方向に波型に折り曲げられた前記自励振動ヒートパイプを支持する受熱部材を備え、
    　前記受熱部材は、前記自励振動ヒートパイプの作動液封入側の一端の周辺を切り欠いた構造を有する
    ことを特徴とする電力変換装置。     The power conversion device according to claim 9, wherein
    A heat receiving member that supports the self-excited vibration heat pipe bent in a wave shape in its longitudinal direction;
    The power receiving device according to claim 1, wherein the heat receiving member has a structure in which a periphery of one end of the self-excited vibration heat pipe on the hydraulic fluid sealing side is cut out.
  13. 　請求項９に記載された電力変換装置において、
    　自らの長手方向に波型に折り曲げられた前記自励振動ヒートパイプを支持する受熱部材を備え、
    　前記自励振動ヒートパイプの作動液封入側となる前記自励振動ヒートパイプの長手方向の一端が、前記受熱部材の受熱面から鉛直上向きとなる構造を有する
    ことを特徴とする電力変換装置。     The power conversion device according to claim 9, wherein
    A heat receiving member that supports the self-excited vibration heat pipe bent in a wave shape in its longitudinal direction;
    A power conversion device having a structure in which one end in a longitudinal direction of the self-excited vibration heat pipe on the hydraulic fluid enclosing side of the self-excited vibration heat pipe is vertically upward from a heat receiving surface of the heat receiving member.
  14. 　請求項１～１３のいずれか１項に記載された電力変換装置において、
    　前記自励振動ヒートパイプに封入される作動液が、ハイドロフルオロオレフィン類である
    ことを特徴とする電力変換装置。     The power conversion device according to any one of claims 1 to 13,
    The hydraulic fluid sealed in the self-excited vibration heat pipe is hydrofluoroolefins, The power converter characterized by the above-mentioned.
  15. 　請求項１～１４のいずれか１項に記載された電力変換装置を搭載する鉄道車両。 A railway vehicle equipped with the power conversion device according to any one of claims 1 to 14.
  16. 　冷却装置に用いる自励振動ヒートパイプの製造方法において、
    　当該自励振動ヒートパイプを構成する流路として、平行に並列して配置された複数の流路の一端を連通させる第１の工程と、
    　前記連通させた複数の流路の一端から前記複数の流路に作動液を流し込む第２の工程と、
    　前記複数の流路の一端の連通部分を機械的に除去して、平行に並列して配置された複数の密閉流路を形成する第３の工程と
    を有する自励振動ヒートパイプの製造方法。     In the manufacturing method of the self-excited vibration heat pipe used for the cooling device,
    As a flow path constituting the self-excited vibration heat pipe, a first step of communicating one end of a plurality of flow paths arranged in parallel,
    A second step of flowing hydraulic fluid into the plurality of flow paths from one end of the plurality of flow paths communicated;
    And a third step of mechanically removing a communicating portion at one end of the plurality of flow paths to form a plurality of sealed flow paths arranged in parallel in parallel.
  17. 　請求項１６に記載された自励振動ヒートパイプの製造方法において、
    　前記第３の工程で機械的に除去するとは、前記連通させた複数の流路の一端を圧潰することである
    ことを特徴とする自励振動ヒートパイプの製造方法。     In the manufacturing method of the self-excited vibration heat pipe according to claim 16,
    The method of manufacturing a self-excited vibration heat pipe, wherein the mechanical removal in the third step is to crush one end of the plurality of connected flow paths.
  18. 　請求項１６または１７に記載された自励振動ヒートパイプの製造方法において、
    　前記第１の工程として、前記複数の流路の一端にある仕切り部を除去し当該一端に封止部材を接合することで、前記複数の流路の一端を連通させたヘッダ部を形成する
    ことを特徴とする自励振動ヒートパイプの製造方法。     In the manufacturing method of the self-excited vibration heat pipe according to claim 16 or 17,
    As the first step, a partition portion at one end of the plurality of flow paths is removed, and a sealing member is joined to the one end, thereby forming a header portion that communicates one end of the plurality of flow paths. A method of manufacturing a self-excited vibration heat pipe.
  19. 　請求項１８に記載された自励振動ヒートパイプの製造方法において、
    　前記第２の工程として、前記ヘッダ部に作動液封入口を取り付けて当該作動液封入口から前記ヘッダ部に前記作動液を流し込む
    ことを特徴とする自励振動ヒートパイプの製造方法。     In the manufacturing method of the self-excited vibration heat pipe according to claim 18,
    A manufacturing method of a self-excited vibration heat pipe, wherein, as the second step, a hydraulic fluid sealing port is attached to the header portion, and the hydraulic fluid is poured into the header portion from the hydraulic fluid sealing port.
  20. 　請求項１６～１９のいずれか１項に記載された自励振動ヒートパイプの製造方法において、
    　前記複数の密閉流路は、当該自励振動ヒートパイプの長手方向に平行な直線形状である
    ことを特徴とする自励振動ヒートパイプの製造方法。     The method for manufacturing a self-excited vibration heat pipe according to any one of claims 16 to 19,
    The method of manufacturing a self-excited vibration heat pipe, wherein the plurality of closed flow paths have a linear shape parallel to a longitudinal direction of the self-excited vibration heat pipe.
  21. 　請求項１６～１９のいずれか１項に記載された自励振動ヒートパイプの製造方法において、
    　前記複数の密閉流路は、当該自励振動ヒートパイプの長手方向にＵ字形状である
    ことを特徴とする自励振動ヒートパイプの製造方法。     The method for manufacturing a self-excited vibration heat pipe according to any one of claims 16 to 19,
    The method for manufacturing a self-excited vibration heat pipe, wherein the plurality of closed flow paths are U-shaped in a longitudinal direction of the self-excited vibration heat pipe.
  22. 　請求項１６～２１のいずれか１項に記載された自励振動ヒートパイプの製造方法において、
    　前記複数の密閉流路は、当該自励振動ヒートパイプの長手方向に同じ長さである
    ことを特徴とする自励振動ヒートパイプの製造方法。     The self-excited vibration heat pipe manufacturing method according to any one of claims 16 to 21,
    The method for producing a self-excited vibration heat pipe, wherein the plurality of closed flow paths have the same length in the longitudinal direction of the self-excited vibration heat pipe.
  23. 　請求項１６～２２のいずれか１項に記載された自励振動ヒートパイプの製造方法において、
    　前記作動液が、ハイドロフルオロオレフィン類である
    ことを特徴とする自励振動ヒートパイプの製造方法。     In the method for manufacturing a self-excited vibration heat pipe according to any one of claims 16 to 22,
    The method for producing a self-excited vibration heat pipe, wherein the hydraulic fluid is a hydrofluoroolefin.
PCT/JP2019/003306 2018-01-31 2019-01-31 Electric power conversion apparatus and method for manufacturing self-excited vibration heat pipe WO2019151375A1 (en)

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