Self-regenerating bridge-type heat pipe and method for manufacturing the same

Abstract

The present invention provides a self-regenerating bridge-type heat pipe and a method for manufacturing the same, which can reduce the filling rate of the working fluid in a sealed channel while suppressing dry-out, and can efficiently transport heat of the working fluid by suppressing heat dissipation in the transmission section. [Solution] A self-regenerating bridge-type heat pipe 1 comprises a sealed channel 2 made of a metal or ceramic base material, which is folded and extended multiple times between a heating section H and a cooling section C, with a transfer section B formed between the heating section H and the cooling section C, and a working fluid 3 that is heated and vaporized in the heating section H and cooled and condensed in the cooling section C, thereby being able to transport heat from the heating section H to the cooling section C mainly using latent heat. The sealed channel 2 is made of a metal or ceramic base material with a thermal conductivity of at least the transfer section B of 100 W / (m·k) or less, and the channel surface 2a is manufactured to worsen wettability with the working fluid 3, and the working fluid 3 is sealed inside.

Description

Technical Field

[0001] The present invention relates to a self-regenerating bridge-type heat pipe capable of transporting heat from a heating part to a cooling part by utilizing the latent heat and sensible heat of a working fluid, and a method for manufacturing the same.

Background Art

[0002] A heat pipe is for transporting heat from a heating part to a cooling part mainly by utilizing the latent heat of a working fluid, and is recently becoming widely popular in industrial equipment and the like due to its high heat transport efficiency and heat responsiveness. A conventional heat pipe usually has a sealed flow path enclosing a working fluid inside, and heat can be transported from the heating part to the cooling part by vaporizing the working fluid in the heating part and condensing it in the cooling part.

[0003] In addition, a heat pipe called a self-excited vibration type heat pipe has a sealed flow path extending back and forth a plurality of times between a heating part and a cooling part, and water (distilled water) as a working fluid enclosed inside the sealed flow path moves between the heating part and the cooling part by self-excited vibration, so an internal structure such as a wick is not required, and a small size and high heat transport can be realized.

[0004] However, a heat pipe called a self-regenerating bridge-type heat pipe can achieve high heat transport even at a filling rate less than the optimum filling rate (40 to 60 vol%) of the working fluid of a self-excited vibration type heat pipe. For example, as a self-regenerating bridge-type heat pipe, as disclosed in Patent Document 1, by manufacturing the flow path surface of the sealed flow path to be water-repellent, it is possible to reduce the filling rate (volume ratio) of the working fluid with respect to the sealed flow path while suppressing dryout.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] However, while the conventional self-regenerating bridge-type heat pipe described above can reduce the filling rate of the working fluid into the sealed channel while suppressing dry-out due to the water-repellent manufacturing of the channel surface, the entire sealed channel is made of aluminum, which means that a large amount of heat is lost in the transfer section between the heating and cooling sections, potentially hindering the efficient heat transport of the working fluid. Therefore, in order to suppress the amount of heat lost in the transfer section and ensure efficient heat transport, it was necessary to insulate the transfer section separately.

[0007] The present invention has been made in view of these circumstances, and aims to provide a self-regenerating bridge-type heat pipe and a method for manufacturing the same that can reduce the filling rate of the working fluid in a sealed channel while suppressing dry-out, and can efficiently transport heat of the working fluid by suppressing heat dissipation in the transmission section. [Means for solving the problem]

[0008] The invention described in claim 1 is a self-regenerating bridge-type heat pipe comprising a sealed channel made of a metal or ceramic base material, which is folded and extended multiple times between a heating section and a cooling section, with a transfer section formed between the heating section and the cooling section, and a working fluid sealed within the sealed channel that is heated and vaporized in the heating section and cooled and condensed in the cooling section, thereby utilizing latent heat to transport heat from the heating section to the cooling section, wherein the sealed channel is made of a metal or ceramic base material with a thermal conductivity of at least 100 W / (m·k) or less of the transfer section, and the surface of the channel is manufactured to worsen wettability with the working fluid, and the working fluid is sealed inside.

[0009] The invention described in claim 2 is characterized in that, in the self-regenerating bridge-type heat pipe described in claim 1, the transmission portion of the sealed flow path is made of any of the following metals as a base material: stainless steel, iron, titanium, nickel, tin, or zinc.

[0010] The invention described in claim 3 is characterized in that, in the self-regenerating bridge-type heat pipe described in claim 1, the transmission portion of the sealed flow path is made of a ceramic material which is silicon carbide, alumina, silicon nitride, or zirconia.

[0011] The invention described in claim 4 is characterized in that, in the self-regenerating bridge-type heat pipe described in claim 1, the heating section and cooling section of the sealed flow path are made of a metal with a thermal conductivity of 200 W / (m·k) or more.

[0012] The invention described in claim 5 is characterized in that, in the self-regenerating bridge-type heat pipe described in claim 1, the heating section and cooling section of the sealed flow path are made of copper or aluminum as the base material.

[0013] The invention described in claim 6 is a self-regenerating bridge-type heat pipe according to claim 1, characterized in that the sealed flow path is made of a single tubular member made of a metal or ceramic with a thermal conductivity of 100 W / (m·k) or less, and the heating section and the cooling section are cast into a metal with a higher thermal conductivity than the tubular member.

[0014] The invention described in claim 7 is a self-regenerating bridge-type heat pipe as described in claim 1, characterized in that the working fluid consists of helium, nitrogen, neon, ammonia, methanol, ethanol, acetone, a predetermined refrigerant, a fluorine-based specialized fluid, water, lithium, sodium, potassium, or mercury.

[0015] The invention described in claim 8 is characterized in that, in the self-regenerating bridge-type heat pipe described in claim 1, the working fluid is filled to the sealed flow path at a volume ratio of 3% or more and less than 10%.

[0016] The invention described in claim 9 is characterized in that, in the self-regenerating bridge-type heat pipe described in claim 1, the wettability of the flow channel surface of the sealed flow channel is deteriorated in any of the following steps: flow channel manufacturing step, chemical surface treatment step, or physical surface treatment step.

[0017] The invention described in claim 10 is a self-regenerating bridge-type heat pipe according to claim 1, characterized in that the sealed flow path is configured such that its wettability is deteriorated based on evaluation by contact angle measurement, liquid recovery time method, or liquid removal diameter method.

[0018] The invention described in claim 11 is a self-regenerating bridge-type heat pipe described in any one of claims 1 to 10, which is applied to an electric vehicle equipped with a drive battery, wherein the heating portion is formed in a location that can absorb the heat generated by the battery, and the cooling portion is made coolable by a cooling fan that can introduce outside air, and the rotation of the cooling fan is controlled according to the heat generated by the battery.

[0019] The invention described in claim 12 is characterized in that, in the self-regenerating bridge-type heat pipe described in claim 7, the transmission section extends at a lower position than the heating section in the electric vehicle.

[0020] The invention described in claim 13 is a method for manufacturing a self-regenerating bridge-type heat pipe, comprising: a sealed channel made of a metal or ceramic as a base material, which is folded and extended multiple times between a heating section and a cooling section, with a transfer section formed between the heating section and the cooling section; and a working fluid sealed within the sealed channel, which is heated and vaporized in the heating section and cooled and condensed in the cooling section, thereby utilizing latent heat to transport heat from the heating section to the cooling section, wherein the sealed channel is made of a metal or ceramic as a base material, with at least the thermal conductivity of the transfer section being 100 W / (m·k) or less, and the channel surface is manufactured to worsen wettability with the working fluid, after which a predetermined amount of the working fluid is sealed inside. [Effects of the Invention]

[0021] According to the invention described in claims 1 and 13, the sealed flow path is made of at least a metal or ceramic with a thermal conductivity of 100 W / (m·k) or less for the base material of the transmission part, and the flow path surface is manufactured so as to deteriorate the wettability with the working fluid. Since a predetermined amount of the working fluid is enclosed, it is possible to reduce the filling rate of the working fluid with respect to the sealed flow path while suppressing dryout, and to suppress heat dissipation of the transmission part and efficiently perform heat transport of the working fluid.

[0022] According to the invention described in claim 2, the transmission part of the sealed flow path is made of any one of the metals of stainless steel, iron, titanium, nickel, tin or zinc as the base material, so that heat dissipation of the transmission part can be suppressed with a relatively inexpensive metal.

[0023] According to the invention described in claim 3, the transmission part of the sealed flow path is made of any one of the ceramics of silicon carbide, alumina, silicon nitride or zirconia as the base material, so that heat dissipation of the transmission part can be suppressed with a relatively inexpensive ceramic.

[0024] According to the invention described in claim 4, the heating part and the cooling part of the sealed flow path are made of a metal with a thermal conductivity of 200 W / (m·k) or more, so that the amount of heat absorption and the amount of heat dissipation of the heating part and the cooling part can be increased, and the heat exchange performance between the heating part and the cooling part can be improved.

[0025] According to the invention described in claim 5, the heating part and the cooling part of the sealed flow path are made of copper or aluminum as the base material, so that the amount of heat absorption and the amount of heat dissipation of the heating part and the cooling part can be increased with copper or aluminum, which is a relatively inexpensive metal.

[0026] According to the invention described in claim 6, the sealed flow path is made of an integral tubular member made of a metal or ceramic with a thermal conductivity of 100 W / (m·k) or less, and the heating part and the cooling part are cast into a metal with a higher thermal conductivity than the tubular member, so that it is possible to improve the heat exchange performance of the heating part and the cooling part while suppressing heat dissipation of the transmission part.

[0027] According to the invention described in claim 7, the working fluid consists of helium, nitrogen, neon, ammonia, methanol, ethanol, acetone, a predetermined refrigerant, a fluorine-based specialized fluid, water, lithium, sodium, potassium, or mercury, so that heat transport by the working fluid can be carried out smoothly and reliably.

[0028] According to the invention described in claim 8, the working fluid is filled to a closed channel at a volume ratio of 3% or more and less than 10%, so that the filling ratio of the working fluid to the closed channel can be reduced while suppressing dryout.

[0029] According to the invention described in claim 9, since the wettability of the channel surface of the sealed channel is deteriorated in any of the channel manufacturing process, chemical surface treatment process, or physical surface treatment process, the wettability of the channel surface of the sealed channel with the working fluid can be reliably deteriorated by a general surface treatment.

[0030] According to the invention described in claim 10, the wettability of the sealed channel is deteriorated based on evaluation by the contact angle measurement method, the liquid recovery time method, or the liquid removal diameter method, so the wettability of the sealed channel can be reliably deteriorated by a general evaluation.

[0031] According to the invention described in claim 11, the invention is applied to an electric vehicle equipped with a drive battery, the heating section is formed in a location that can absorb the heat generated by the battery, and the cooling section is made coolable by a cooling fan that can introduce outside air, and the rotation of the cooling fan is controlled according to the heat generated by the battery, so the amount of heat dissipated by the cooling section can be easily adjusted by controlling the cooling fan.

[0032] According to the invention described in claim 12, since the transmission unit extends at a lower position than the heating unit in the electric vehicle, the transmission unit can be positioned at a lower position in the vehicle, thereby improving the freedom of layout of the vehicle, including the self-regenerating bridge-type heat pipe. [Brief explanation of the drawing]

[0033] [Figure 1]A schematic diagram showing a self-regenerating bridge-type heat pipe (with both ends of the sealed flow path closed) according to an embodiment of the present invention. [Figure 2] A schematic diagram showing a cooling system to which the self-regenerating bridge-type heat pipe (with both ends of a sealed flow path closed) is applied. [Figure 3] A schematic diagram showing a cooling system to which the self-regenerating bridge-type heat pipe (a sealed flow path with both ends connected) is applied. [Figure 4] A schematic diagram showing a cooling device to which a self-regenerating bridge-type heat pipe, according to another embodiment of the present invention, is applied. [Figure 5] Table showing the substances used as working fluids in the self-regenerating bridge-type heat pipe. [Figure 6] A schematic diagram showing an electric vehicle equipped with a cooling system to which the self-regenerating bridge-type heat pipe is applied. [Figure 7] A flowchart illustrating the control of the cooling fan in the electric vehicle. [Figure 8] Plan view showing a self-regenerating bridge-type heat pipe used in an experiment to demonstrate the technical advantages of the present invention. [Figure 9] Cross-sectional view of line IX-IX in Figure 8 [Figure 10] Graph showing experimental results (temperature history when using water with a filling rate of 4%) to demonstrate the technical advantages of the present invention. [Figure 11] Graph showing experimental results (temperature history when using water with a filling rate of 6%) to demonstrate the technical advantages of the present invention. [Figure 12] Graph showing experimental results (temperature history when using water with a filling rate of 8%) to demonstrate the technical advantages of the present invention. [Figure 13] Graph showing experimental results (temperature history when using water with a filling rate of 10%) to demonstrate the technical advantages of the present invention. [Modes for carrying out the invention]

[0034] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The self-regenerating bridge-type heat pipe 1 according to this embodiment is capable of transporting heat from a heating section to a cooling section using the latent heat and sensible heat (mainly latent heat) of the working fluid. As shown in Figure 1, it comprises a sealed flow path 2 that is folded and extended multiple times between a heating section H and a cooling section C, with a transfer section B formed between the heating section H and the cooling section C, and a working fluid 3 sealed within the sealed flow path 2 that is capable of transporting heat from the heating section H to the cooling section C.

[0035] The sealed channel 2 consists of a tubular member formed by bending a metal or ceramic base material, and its interior is a continuous channel capable of holding the working fluid 3 in a sealed state. Furthermore, the sealed channel 2 is depressurized while the working fluid 3 is sealed inside at a predetermined filling rate, allowing the working fluid 3 to move between the heating section H and the cooling section C under depressurized conditions. In this embodiment, the sealed channel 2 is closed at both ends, but as shown in Figure 3, it may be configured with both ends connected.

[0036] The sealed channel 2 according to this embodiment is made of at least one of the following metals: stainless steel (SUS), iron (Fe), titanium (Ti), nickel (Ni), tin (Sn), or zinc (Zn), or one of the following ceramics: aluminum nitride (AlN), silicon carbide (SiC), alumina (Al2O3), silicon nitride (SiN), or zirconia (ZrO2).

[0037] The working fluid 3 is heated and vaporized in the heating section H (the high-temperature section) and cooled and condensed in the cooling section C (the low-temperature section that is not heated), allowing heat to be transported from the heating section H to the cooling section C mainly using latent heat. That is, as shown in Figure 1, when heat is transported by the self-regenerating bridge-type heat pipe 1, the working fluid 3 inside the sealed flow path 2 becomes two phases: vapor 3c (vaporized working fluid 3) and liquefied working fluid 3. The liquefied working fluid 3 exists in the form of liquid slag 3a (a pool of working fluid 3), bridge 3b (a thin liquid film in the form of liquid slag), or droplet 3d (small droplet-shaped working fluid 3).

[0038] The sealed flow path 2 is divided almost alternately into a flow path where liquid slug 3a is present and a flow path where liquid slug 3a is not present. The bridge 3b regenerated in the heating section H vaporizes (evaporates or boils) by absorbing heat. Due to the pressure difference on both sides of the bridge 3b created by this vaporization, the bridge 3b moves to the cooling section C, accompanied by the surrounding steam 3c. The bridge 3b that has moved to the cooling section C combines with the liquid slug 3a accumulated in the cooling section C, is cooled and releases sensible heat, while the steam 3c that has moved to the cooling section C is cooled and condenses, mainly releasing latent heat.

[0039] Furthermore, in the cooling section C, liquid slag 3a separates as droplets 3d, or cooled vapor 3c condenses to form droplets 3d, and these adhere to the channel surface 2a of the sealed channel 2. Since the channel surface 2a of the sealed channel 2 is manufactured with poor wettability, the droplets 3d repel each other due to surface tension and move from the cooling section C to the heating section H along both the channel surface 2a where liquid slag 3a is present and the channel surface 2a where liquid slag 3a is not present. Then, some of the droplets vaporize during the movement, and the droplets 3d that have moved from both the channel where liquid slag 3a is present and the channel where liquid slag 3a is not present repeatedly combine in the heating section H, regenerating the bridge 3b. By repeating the above process, continuous heat transport is made possible.

[0040] In this embodiment, the sealed channel 2 is manufactured such that its channel surface 2a is made to worsen its wettability with the working fluid 3. Specifically, the sealed channel 2 has its wettability worsened in one of the following processes: channel manufacturing process, chemical surface treatment process (coating, oxidation treatment, or plating, etc.), or physical surface treatment process (sandblasting or plasma treatment, etc.). For example, its wettability is worsened based on evaluation by contact angle measurement method, liquid recovery time method, or liquid removal diameter method.

[0041] In particular, the sealed channel 2 according to this embodiment is made of a metal or ceramic as the base material, with at least the thermal conductivity of the transmission section B being 100 W / (m·k) or less. For example, it can be made of any of the following metals as the base material: stainless steel, iron, titanium, nickel, tin, or zinc, or of any of the following ceramics as the base material: silicon carbide, alumina, silicon nitride, or zirconia.

[0042] On the other hand, the heating section H and cooling section C of the sealed channel 2 according to this embodiment can be made of a metal with a thermal conductivity of 200 W / (m·k) or higher, for example, copper or aluminum can be used as the base material. For example, as shown in Figure 2, the sealed channel 2 may consist of a single tubular member made of a metal or ceramic with a thermal conductivity of 100 W / (m·k) or lower, and the heating section H and cooling section C may be cast into a metal with a higher thermal conductivity than the tubular member.

[0043] However, the heating section H and cooling section C of the sealed flow channel 2 may be formed by machining or other methods to create flow channels Ha and Ca, respectively, in a metal (for example, one made from copper or aluminum) with a thermal conductivity of 200 W / (m·k) or higher, as shown in Figure 2, while the transmission section B may be a tubular member made of a metal or ceramic with a thermal conductivity of 100 W / (m·k) or lower, with the flow channel Ba of the transmission section B connected to the flow channels Ha and Ca of the heating section H and cooling section C.

[0044] Furthermore, the sealed channel 2 according to this embodiment is filled with a predetermined amount of working fluid 3 (a small amount relative to the volume of the sealed channel 2). Preferably, the filling rate of the working fluid 3 in relation to the sealed channel 2 is 3% or more and less than 10% by volume. As shown in Figure 5, such working fluid 3 may include helium (He), nitrogen (N2), neon (Ne), ammonia (NH3), methanol (CH3OH), ethanol (C2H5OH), acetone (C3H6O), a predetermined refrigerant (tetrafluoromethane, dichlorodifluoromethane, tetrafluoroethane, dichlorotrifluoroethane, trichlorotrifluoroethane), a fluorine-based fluid, water (H2O), lithium (Li), sodium (Na), potassium (K), and naphthalene (C).10 It is said to consist of H8 or mercury (Hg).

[0045] The self-regenerating bridge-type heat pipe 1 according to this embodiment comprises a sealed channel 2 made of a metal or ceramic base material, which is folded and extended multiple times between a heating section H and a cooling section C, with a transfer section B formed between the heating section H and the cooling section C, and a working fluid 3 sealed within the sealed channel 2 that is heated and vaporized in the heating section H and cooled and condensed in the cooling section C, thereby transporting heat from the heating section H to the cooling section C mainly using latent heat. The sealed channel 2 is made of a metal or ceramic base material with a thermal conductivity of at least the transfer section B of 100 W / (m·k) or less, and the channel surface 2a is manufactured to worsen wettability with the working fluid 3, after which a predetermined amount of the working fluid 3 is sealed inside.

[0046] Furthermore, the self-regenerating bridge-type heat pipe 1 according to this embodiment is applied to a cooling device equipped with a cooling fan 4 capable of cooling the cooling section C, as shown in Figures 2 and 3 (the same applies to the embodiment shown in Figure 4). This cooling fan 4 rotates when driven and blows air onto the cooling section C, allowing for more reliable cooling of the cooling section C by blowing air, thereby improving the heat exchange performance of the cooling section C.

[0047] However, as shown in Figure 6, the self-regenerating bridge-type heat pipe 1 according to this embodiment can be applied to an electric vehicle 7 equipped with a drive battery 5. In this case, the heating section H is formed in a location that can absorb the heat generated by the battery 5, and the cooling section C can be cooled by a cooling fan 4 that can introduce outside air. The rotation of the cooling fan 4 can be controlled according to the heat generated by the battery 5.

[0048] Specifically, the electric vehicle 7 used in this embodiment is equipped with a temperature sensor 6 capable of detecting the heat generated by the storage battery 5, and the rotation of the cooling fan 4 is controlled according to the temperature detected by the temperature sensor 6. The control details of the cooling fan 4 will be explained below based on the flowchart in Figure 7. Note that predetermined value 1 and predetermined value 2 satisfy the relationship predetermined value 1 < predetermined value 2.

[0049] In S1, the temperature sensor 6 detects the temperature of the storage battery 5 and obtains the battery temperature. In S2, it is determined whether the battery temperature is higher than a predetermined value of 1. If in S2 it is determined that the battery temperature is not higher than the predetermined value of 1, in S4 the cooling fan 4 is turned off and the operation is stopped. If in S2 it is determined that the battery temperature is higher than the predetermined value of 1, in S3 it is determined whether the battery temperature is lower than a predetermined value of 2.

[0050] Then, if it is determined in S3 that the battery temperature is lower than a predetermined value 2, the cooling fan 4 is driven at a low speed (low speed control) in S5, and if it is determined in S5 that the battery temperature is not lower than the predetermined value 2, the cooling fan is driven at a high speed (high speed control) in S6. In this way, according to the electric vehicle 7 applied to this embodiment, the rotation of the cooling fan 4 is controlled according to the heat generated by the storage battery 5, so the amount of heat dissipated by the cooling unit C can be easily adjusted by controlling the cooling fan 4.

[0051] Furthermore, as shown in Figure 6, the self-regenerating bridge-type heat pipe 1 equipped in the electric vehicle 7 has a heating section H positioned above the battery 5, while the transmission section B extends from a lower position than the heating section H in the electric vehicle 7. Because heat transfer by the working fluid 3 does not depend on gravity, the transmission section B can be extended from a lower position than the heating section H in the electric vehicle 7. This allows various components of the electric vehicle 7 to be laid out above the transmission section B, for example, thereby improving the flexibility of the vehicle layout including the self-regenerating bridge-type heat pipe 1.

[0052] According to the self-regenerating bridge-type heat pipe 1 of this embodiment, the sealed channel 2 is made of a metal or ceramic as the base material, with at least the thermal conductivity of the transmission part B being 100 W / (m·k) or less, and the channel surface 2a is manufactured to worsen wettability with the working fluid 3, and a predetermined amount of working fluid 3 is sealed inside, so that the filling rate of the working fluid 3 into the sealed channel 2 can be reduced while suppressing dryout, and the heat dissipation of the transmission part B can be suppressed, allowing for efficient heat transport of the working fluid 3.

[0053] Furthermore, if the transmission section B of the sealed channel 2 according to this embodiment is made of any of the following metals as the base material, heat dissipation from the transmission section B can be suppressed with a relatively inexpensive metal. Moreover, if the transmission section B of the sealed channel 2 is made of any of the following ceramics as the base material, heat dissipation from the transmission section B can be suppressed with a relatively inexpensive ceramic.

[0054] Furthermore, since the heating section H and cooling section C of the sealed channel 2 according to this embodiment are made of a metal with a thermal conductivity of 200 W / (m·k) or higher, the amount of heat absorbed and released by the heating section H and cooling section C can be increased, and the heat exchange performance between the heating section H and the cooling section C can be improved. Also, if the heating section H and cooling section C of the sealed channel 2 are made of copper or aluminum as the base material, the amount of heat absorbed and released by the heating section H and cooling section C can be increased using copper or aluminum, which are relatively inexpensive metals.

[0055] In addition, if the sealed flow path 2 is made of a single tubular member made of a metal or ceramic with a thermal conductivity of 100 W / (m·k) or less, and the heating section H and cooling section C are cast into a metal with a higher thermal conductivity than the tubular member, then the heat exchange performance of the heating section H and cooling section C can be improved while suppressing heat dissipation from the transmission section B.

[0056] Furthermore, since the working fluid 3 according to this embodiment consists of helium, nitrogen, neon, ammonia, methanol, ethanol, acetone, a predetermined refrigerant, a fluorine-based specialized fluid, water, lithium, sodium, potassium, or mercury, heat transport by the working fluid 3 can be carried out smoothly and reliably.

[0057] Furthermore, since the working fluid 3 according to this embodiment has a filling rate of 3% or more and less than 10% by volume relative to the sealed channel 2, it is possible to reduce the filling rate of the working fluid to the sealed channel 2 while suppressing dry-out. In addition, since the wettability of the sealed channel 2 is deteriorated in any of the following processes: channel manufacturing process, chemical surface treatment process, or physical surface treatment process, the wettability of the sealed channel can be reliably deteriorated by general surface treatment. In particular, since the wettability of the sealed channel 2 is deteriorated based on evaluation by contact angle measurement method, liquid recovery time method, or liquid removal diameter method, the wettability of the sealed channel 2 can be reliably deteriorated by general evaluation.

[0058] Furthermore, the system is applied to an electric vehicle 7 equipped with a drive battery 5. The heating section H is formed in a location that can absorb the heat generated by the battery 5, and the cooling section C can be cooled by a cooling fan 4 that can introduce outside air. By controlling the rotation of the cooling fan 4 according to the heat generated by the battery 5, the amount of heat dissipated by the cooling section C can be easily adjusted by controlling the cooling fan 4.

[0059] Next, we will describe experimental results demonstrating the technical advantages of the self-regenerating bridge-type heat pipe 1 according to this embodiment. In the experiment, as shown in Figures 8 and 9, a sealed channel 2 was formed by machining an aluminum block with a vertical dimension α = 400 mm, a horizontal dimension β = 48 mm, and a thickness dimension γ = 2 mm. The surface 2a of the sealed channel 2 was then treated with anodizing to worsen its wettability. The sealed channel 2 had a rectangular cross-section consisting of a square with dimension a = 1.26 mm, and the heating section H and cooling section C accounted for approximately 20% of the total, while the transmission section B located between the heating section H and cooling section C accounted for approximately 60% of the total.

[0060] Furthermore, the air in the sealed channel 2 was discharged to reduce the pressure, and water (distilled water) was sealed into the sealed channel 2 as the working fluid 3. The filling ratio of the working fluid 3 in the sealed channel 2 was set to 3-10% by volume. The filling ratio (volume ratio FR) of the working fluid 3 is calculated using the following formula. FR = V / V0 × 100 However, V(mm 3 ) is the volume of the working fluid 3 filled in the sealed channel 2, V0 (mm³). 3 ) is the volume of the flow path in the sealed flow path 2.

[0061] Furthermore, the surface 2a of the sealed channel 2 is surface-treated (anodized), and as a result, based on evaluation by the contact angle measurement method, the contact angle for water is 80° or more.

[0062] Then, in the sealed channel 2 according to this embodiment, water (distilled water) with volume ratios of 4, 6, 8, and 10% filling rates was sealed as the working fluid 3, and the temperature of the heating section H (heating section temperature (°C)) and the temperature of the cooling section C (cooling section temperature (°C)) were measured when the heating section H was heated, and experiments were conducted on the temperature history, yielding the results shown in Figures 10 to 13. Specifically, Figure 10 shows the temperature history when water with a volume ratio of 4% filling rate is used, Figure 11 shows the temperature history when water with a volume ratio of 6% filling rate is used, Figure 12 shows the temperature history when water with a volume ratio of 8% filling rate is used, and Figure 13 shows the temperature history when water with a volume ratio of 10% filling rate is used.

[0063] As a result, the heating section temperature and the cooling section temperature remain almost the same regardless of the filling density, indicating that intense heat transfer is occurring from the heating section H to the cooling section C. In this experiment, water (distilled water) was sealed as the working fluid 3, but it is expected that a similar temperature history will occur even if other working fluids 3 are used.

[0064] Although this embodiment has been described above, the present invention is not limited thereto. For example, other working fluids may be used as the working fluid 3, or other materials such as metal or ceramic may be used as the base material for the sealed channel 2. Furthermore, the sealed channel 2 may have its wettability worsened by other surface manufacturing processes, as long as the wettability of its channel surface 2a with respect to the working fluid 3 is reduced. [Industrial applicability]

[0065] This invention can be applied to other forms as long as they are in the same spirit as the present invention. [Explanation of Symbols]

[0066] 1. Self-regenerating bridge-type heat pipe 2 Sealed channel 2a Flow channel surface 3 Working fluid 3a Liquid slag 3b Bridge 3c steam 3D droplet 4 Cooling fan 5. Storage Battery 6. Temperature sensor 7 Electric Vehicles H heating section C Cooling section B Transmission section

Claims

1. A sealed channel made of metal or ceramic as the base material, which is folded and extended multiple times between the heating section and the cooling section, and a transmission section is formed between the heating section and the cooling section, A working fluid, sealed within the aforementioned sealed channel, which is heated in the heating section and vaporized, and then cooled in the cooling section and condensed, thereby utilizing latent heat to transport heat from the heating section to the cooling section, A self-regenerating bridge-type heat pipe equipped with, The sealed channel is made of a metal or ceramic as the base material, with a thermal conductivity of at least 100 W / (m·k) or less in the transmission section, and the channel surface is manufactured to worsen wettability with the working fluid, and the working fluid is sealed inside, characterized in that the self-regenerating bridge-type heat pipe.

2. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the transmission section of the sealed flow path is made of a base material of any of the following metals: stainless steel, iron, titanium, nickel, tin, or zinc.

3. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the transmission section of the sealed flow path is made of a ceramic material which is silicon carbide, alumina, silicon nitride, or zirconia.

4. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the heating and cooling sections of the sealed flow path are made of a metal with a thermal conductivity of 200 W / (m·k) or more.

5. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the heating and cooling sections of the sealed flow path are made of copper or aluminum as the base material.

6. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the sealed flow path is made of a single tubular member made of a metal or ceramic with a thermal conductivity of 100 W / (m·k) or less, and the heating section and cooling section are cast into a metal with a higher thermal conductivity than the tubular member.

7. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the working fluid consists of helium, nitrogen, neon, ammonia, methanol, ethanol, acetone, a predetermined refrigerant, a fluorine-based specialized fluid, water, lithium, sodium, potassium, or mercury.

8. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the working fluid has a filling rate of 3% or more and less than 10% by volume relative to the sealed flow path.

9. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the wettability of the channel surface of the sealed channel is deteriorated in any of the following steps: channel manufacturing, chemical surface treatment, or physical surface treatment.

10. The self-regenerating bridge-type heat pipe according to claim 1, characterized in that the sealed flow channel is configured such that its wettability is deteriorated based on evaluation by contact angle measurement, liquid recovery time method, or liquid removal diameter method.

11. Applicable to electric vehicles equipped with a battery for propulsion, The self-regenerating bridge-type heat pipe according to any one of claims 1 to 10, characterized in that the heating section is formed in a location capable of absorbing the heat generated by the storage battery, the cooling section is capable of being cooled by a cooling fan that can introduce outside air, and the rotation of the cooling fan is controlled according to the heat generated by the storage battery.

12. The self-regenerating bridge-type heat pipe according to claim 7, characterized in that the transmission section extends at a lower position than the heating section in the electric vehicle.

13. A sealed channel made of metal or ceramic as the base material, which is folded and extended multiple times between the heating section and the cooling section, and a transmission section is formed between the heating section and the cooling section, A working fluid, sealed within the aforementioned sealed channel, which is heated in the heating section and vaporized, and then cooled in the cooling section and condensed, thereby utilizing latent heat to transport heat from the heating section to the cooling section, A method for manufacturing a self-regenerating bridge-type heat pipe, comprising: A method for manufacturing a self-regenerating bridge-type heat pipe, characterized in that the sealed channel is made of a metal or ceramic as the base material, with at least the thermal conductivity of the transmission portion being 100 W / (m·k) or less, and the channel surface is manufactured to worsen wettability with the working fluid, after which a predetermined amount of the working fluid is sealed inside.

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