Liquid cooling wire and design method of liquid cooling wire

Abstract

The present invention relates to a liquid-cooled wire and a design method for the liquid-cooled wire, wherein the liquid-cooled wire comprises: an outer sheath; at least one group of liquid-cooled tube groups, each group of liquid-cooled tube groups comprises a liquid inlet tube and a liquid outlet tube, the liquid inlet tube is provided with a second channel, the liquid outlet tube is provided with a third channel, and the diameter of the second channel of the same group is greater than the diameter of the third channel; at least one group of conductor groups, each group of conductor groups comprises two conductors; the sum of the cross-sectional areas of the conductors for passing positive current is equal to the sum of the cross-sectional areas of the conductors for passing negative current; each conductor is arranged in any second channel or third channel; or, each conductor is arranged outside any liquid inlet tube or liquid outlet tube. To improve the heat exchange effect between the coolant in the third channel and the conductor, and to improve the uniformity of the heat dissipation of the conductor by the coolant in the second channel and the coolant in the third channel.

Description

Technical Field

[0001] The present invention relates to the field of cable technology, and in particular to a liquid cooling wire and a design method for the liquid cooling wire. Background Art

[0002] Charging gun cables usually use liquid cooling to dissipate heat and cool the conductors inside the cable.

[0003] In some existing liquid-cooled wires, the DC+ conductor and DC- conductor are respectively arranged in a liquid inlet pipe and a liquid outlet pipe of equal diameter. After the coolant flows through the liquid inlet pipe, the temperature rises. When it flows through the liquid outlet pipe, the heat exchange capacity becomes weak, resulting in uneven heat dissipation of the DC+ conductor and the DC- conductor, which will affect the performance and service life of the liquid-cooled wire. Summary of the invention

[0004] Based on this, it is necessary to provide a liquid cooling wire and a design method for the liquid cooling wire to address the above problems, so as to improve the uniformity of conductor heat dissipation.

[0005] The present invention first provides a liquid-cooling wire, comprising: an outer sheath, provided with a first channel; at least one group of liquid-cooling tube groups, inserted into the first channel, each group of the liquid-cooling tube groups comprising a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe being provided with a second channel, the liquid outlet pipe being provided with a third channel, the second channel and the third channel of the same group being respectively used to pass cooling liquids flowing in opposite directions, and the diameter d1 of the second channel of the same group being greater than the diameter d2 of the third channel; and at least one group of conductor groups, each group of the conductor groups comprising two conductors, the two conductors of the same group being respectively used to pass positive current and negative current; wherein each of the conductors is inserted into any of the second channel or the third channel; or, each of the conductors is sleeved outside any of the liquid inlet pipe or the liquid outlet pipe.

[0006] In the above-mentioned liquid-cooled wire, the coolant flowing in the second channel can take away the heat generated by the conductor corresponding to the liquid inlet pipe, and the coolant flowing in the third channel can take away the heat generated by the conductor corresponding to the liquid outlet pipe; although the coolant temperature in the third channel is higher than the coolant temperature in the second channel, since the diameter d1 of the second channel in the same group is larger than the diameter d2 of the third channel, that is, the cross-sectional area of ​​the second channel is larger than the cross-sectional area of ​​the third channel, and the flow rate q of the coolant remains unchanged, the flow rate of the coolant in the second channel is smaller than the flow rate of the coolant in the third channel, thereby improving the heat exchange effect between the coolant in the third channel and the conductor corresponding to the liquid outlet pipe, improving the uniformity of the heat dissipation of the conductor by the coolant in the second channel and the coolant in the third channel, and ensuring the performance and service life of the liquid-cooled wire.

[0007] In one embodiment, the cross-sectional areas of the two conductors corresponding to the liquid inlet pipe and the liquid outlet pipe in the same group are equal.

[0008] With such an arrangement, the heat generation power P per unit time of two conductors with equal cross-sectional areas is equal, so that the user can easily adjust the diameter d1 of the second channel and the diameter d2 of the third channel in the same group.

[0009] In one embodiment, the diameter d1 of the second channel and the diameter d2 of the third channel in the same group satisfy: (Nu1·A1 / d1) / (Nu2·A2 / d2)=(T DC -T2) / (T DC -T1); wherein Nu1 is the Nusselt number of the coolant in the second channel, Nu2 is the Nusselt number of the coolant in the third channel, A1 is the convection contact area between the coolant in the second channel and the corresponding conductor, A2 is the convection contact area between the coolant in the third channel and the corresponding conductor, T DC is the preset temperature of the conductor, T1 is the temperature of the coolant in the second channel, and T2 is the temperature of the coolant in the third channel.

[0010] Such a configuration can facilitate users to obtain the relationship between the diameter d2 of the third channel and the diameter d1 of the second channel, thereby facilitating users to adjust the diameter d1 of the second channel and the diameter d2 of the third channel in the same group, thereby improving the performance of the liquid cooling wire and extending its service life.

[0011] In one embodiment, the Nusselt number Nu1 of the coolant in the second channel satisfies: Nu1=C·(ρ·v1·d1 / μ) m ·(μ·Cp / λ) n The Nusselt number Nu2 of the coolant in the third channel satisfies: Nu2=C·(ρ·v2·d2 / μ) m ·(μ·Cp / λ) n ; Wherein, ρ is the density of the coolant, v1 is the flow rate of the coolant in the second channel, v2 is the flow rate of the coolant in the third channel, μ is the dynamic viscosity of the coolant, Cp is the specific heat capacity of the coolant, λ is the thermal conductivity of the coolant, and C, m, and n are constants.

[0012] This arrangement can more accurately obtain the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel in the same group, further facilitating the user to adjust the diameter d1 of the second channel and the diameter d2 of the third channel in the same group, and also making the adjustment result more accurate.

[0013] In one embodiment, the liquid-cooled wire also includes at least one cable arranged in the first channel, and the cable includes at least one of a signal line, a control line and a ground line; and / or, the liquid-cooled wire also includes a wrapping member attached to the inner wall of the outer sheath; and / or, the liquid-cooled wire also includes a tensile member filled in the first channel.

[0014] With this configuration, the signal line is used to transmit signals, the control line is used to control the operation of the equipment, and the grounding wire is used to introduce leakage current into the ground to ensure the safe use of the equipment; the wrapping parts are used to tighten and fix the liquid cooling pipe group and cables; the tensile parts are used to increase the strength of the liquid cooling wire.

[0015] The present invention also provides a method for designing a liquid-cooling wire, which is used for the liquid-cooling wire as described above, and the method for designing the liquid-cooling wire comprises the steps of:

[0016] Get the liquid cooling wire model;

[0017] Each group of liquid cooling tubes is independently adjusted: the diameter d1 of the second channel and the diameter d2 of the third channel are adjusted so that the diameter d1 of the second channel is larger than the diameter d2 of the third channel.

[0018] With this arrangement, each group of liquid cooling tubes is independently adjusted, so that each group of liquid cooling tubes can improve the uniformity of heat dissipation of the conductor by the coolant in the second channel and the coolant in the third channel.

[0019] In one embodiment, in the step of adjusting the diameter d1 of the second channel and the diameter d2 of the third channel so that the diameter d1 of the second channel is larger than the diameter d2 of the third channel, the following steps are further included:

[0020] Get the preset temperature T of the conductor DC , the coolant temperature T1 in the second channel and the coolant temperature T2 in the third channel;

[0021] Based on the preset temperature T of the conductor DC , a coolant temperature T1 in the second channel and a coolant temperature T2 in the third channel, and obtaining a ratio of a diameter d2 of the third channel to a diameter d1 of the second channel;

[0022] The diameter d1 of the second channel and the diameter d2 of the third channel are adjusted based on the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel.

[0023] With such configuration, after obtaining the proportional relationship between the diameter d2 of the third channel and the diameter d1 of the second channel, the user can adjust the diameter d1 of the second channel and the diameter d2 of the third channel in the same group, and the adjustment result is more accurate.

[0024] In one embodiment, after the step of adjusting the diameter d1 of the second channel and the diameter d2 of the third channel based on the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel, the method further includes the following steps:

[0025] Obtaining actual temperatures of the two conductors corresponding to the liquid cooling tube group;

[0026] Determine whether the actual temperatures of the two conductors are equal to the preset temperature T of the conductors DC ;

[0027] If yes, the design is completed;

[0028] If not, the step of adjusting the diameter d1 of the second channel and the diameter d2 of the third channel based on the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel is executed in a loop.

[0029] In this way, when the actual temperature of the two conductors is equal to the preset temperature T DC , it means that the coolant in the second channel and the coolant in the third channel can achieve uniform heat dissipation for the two conductors, meeting the design requirements; when the actual temperature of any conductor is not equal to the preset temperature T of the conductor DC When the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel is satisfied, the diameter d1 of the second channel and the diameter d2 of the third channel need to be adjusted continuously until the actual temperatures of the two conductors are equal to the preset temperature T of the conductors. DC .

[0030] In one embodiment, in the step of DC , the coolant temperature T1 in the second channel and the coolant temperature T2 in the third channel, and obtaining the ratio of the diameter d1 of the second channel to the diameter d2 of the third channel, further comprising the steps of:

[0031] Based on the formula: (Nu1·A1 / d1) / (Nu2·A2 / d2)=(T DC -T2) / (T DC -T1), obtaining the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel;

[0032] Among them, Nu1 is the Nusselt number of the coolant in the second channel, Nu2 is the Nusselt number of the coolant in the third channel, A1 is the convection contact area between the coolant in the second channel and the corresponding conductor, and A2 is the convection contact area between the coolant in the third channel and the corresponding conductor.

[0033] This configuration allows the user to obtain the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel, and adjust the diameters d1 and d2 of the second channel according to the ratio.

[0034] In one embodiment, in the step, based on the formula: (Nu1·A1 / d1) / (Nu2·A2 / d2)=(T DC -T2) / (T DC -T1), obtaining the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel, further comprising the steps of:

[0035] Based on the formula: Nu1=C·(ρ·v1·d1 / μ) m ·(μ·Cp / λ) n ,Nu2=C·(ρ·v2·d2 / μ) m ·(μ·Cp / λ) n , obtaining the Nusselt number Nu1 of the coolant in the second channel and the Nusselt number Nu2 of the coolant in the third channel;

[0036] Wherein, ρ is the density of the coolant, v1 is the flow rate of the coolant in the second channel, v2 is the flow rate of the coolant in the third channel, μ is the dynamic viscosity of the coolant, Cp is the specific heat capacity of the coolant, λ is the thermal conductivity of the coolant, and C, m, and n are constants.

[0037] This arrangement enables the user to more accurately obtain the ratio of the diameter d2 of the third channel to the diameter d1 of the second channel, further facilitating the user to adjust the diameter d1 of the second channel and the diameter d2 of the third channel in the same group, and also making the adjustment result more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 It is a schematic cross-sectional structure diagram of a liquid-cooled wire according to a first embodiment of the present invention;

[0040] Figure 2 is a schematic cross-sectional structural diagram of a liquid-cooled wire according to a second embodiment of the present invention;

[0041] Figure 3is a schematic cross-sectional structural diagram of a liquid-cooled wire according to a third embodiment of the present invention;

[0042] Figure 4 is a schematic cross-sectional structural diagram of a liquid-cooled wire according to a fourth embodiment of the present invention;

[0043] Figure 5 A process for designing a liquid cooling wire according to an embodiment of the present invention Figure 1 ;

[0044] Figure 6 A process for designing a liquid cooling wire according to an embodiment of the present invention Figure 2 .

[0045] Figure numerals: 1, outer sheath; 11, first channel; 2, liquid cooling tube group; 2a, first liquid cooling tube group; 2b, second liquid cooling tube group; 21, liquid inlet pipe; 21a, first liquid inlet pipe; 21b, second liquid inlet pipe; 211, second channel; 22, liquid outlet pipe; 22a, first liquid outlet pipe; 22b, second liquid outlet pipe; 221, third channel; 3, conductor group; 31, conductor; 4, cable; 5, wrapping member; 6, tensile member. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0047] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0050] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0051] Charging gun cables usually use liquid cooling to dissipate heat and cool the conductors in the cable. In some existing liquid-cooled wires, the DC+ conductor and DC- conductor are respectively arranged in the liquid inlet pipe and the liquid outlet pipe of equal diameter. The temperature of the coolant rises after flowing through the liquid inlet pipe. When it flows through the liquid outlet pipe, the heat exchange capacity becomes weaker, resulting in uneven heat dissipation of the DC+ conductor and the DC- conductor, which will affect the performance and service life of the liquid-cooled wire. There are also some liquid-cooled wires that respectively arrange the DC+ conductor and the DC- conductor in two liquid inlet pipes or two liquid outlet pipes of equal diameter, and set a separate liquid outlet pipe or liquid inlet pipe, but this will cause the overall size of the liquid-cooled wire to increase and the space utilization rate to decrease.

[0052] In order to solve the above problems, Figures 1 to 4 As shown, the present invention first provides a liquid-cooled wire to improve the uniformity of heat dissipation of the conductor.

[0053] like Figures 1 to 4 As shown, specifically, the liquid-cooled wire includes an outer sheath 1, at least one group of liquid-cooling tube groups 2 and at least one group of conductor groups 3. The outer sheath 1 is provided with a first channel 11; the liquid-cooling tube group 2 is arranged in the first channel 11, and each group of liquid-cooling tube groups 2 includes a liquid inlet pipe 21 and a liquid outlet pipe 22, the liquid inlet pipe 21 is provided with a second channel 211, and the liquid outlet pipe 22 is provided with a third channel 221. The second channel 211 and the third channel 221 of the same group are respectively used to pass the cooling liquid flowing in opposite directions, and the diameter d1 of the second channel 211 of the same group is greater than the diameter d2 of the third channel 221; each group of conductor groups 3 includes two conductors 31, and the two conductors 31 of the same group are respectively used to pass positive current and negative current. Among them, each conductor 31 is arranged in any second channel 211 or third channel 221; or, each conductor 31 is sleeved outside any liquid inlet pipe 21 or liquid outlet pipe 22.

[0054] In the liquid-cooled wire provided in the embodiment of the present invention, the two ends of the liquid-cooled wire are respectively used to connect with the charging gun and the charging pile. A cooling device is provided in the charging pile. The coolant in the cooling device can flow to the charging gun through the second channel 211 of any liquid inlet pipe 21, and the coolant flowing in the second channel 211 can take away the heat generated by the conductor 31 corresponding to the liquid inlet pipe 21. After the coolant flows to the charging gun, it can flow back to the cooling device through the third channel 221 of the liquid outlet pipe 22 of the same group as the liquid inlet pipe 21 to realize the circulation of the coolant, and the coolant flowing in the third channel 221 can take away the heat generated by the conductor 31 corresponding to the liquid outlet pipe 22. Although the coolant in the third channel 221 The coolant temperature is higher than the coolant temperature in the second channel 211, but because the diameter d1 of the second channel 211 in the same group is greater than the diameter d2 of the third channel 221, that is, the cross-sectional area of ​​the second channel 211 is greater than the cross-sectional area of ​​the third channel 221, and the flow rate q of the coolant remains unchanged, the flow rate of the coolant in the second channel 211 is less than the flow rate of the coolant in the third channel 221, thereby improving the heat exchange effect between the coolant in the third channel 221 and the conductor 31 corresponding to the liquid outlet pipe 22, improving the uniformity of the coolant in the second channel 211 and the coolant in the third channel 221 to the heat dissipation of the conductor 31, and ensuring the performance and service life of the liquid-cooled wire. In addition, there is no need to add a separate liquid outlet pipe or liquid inlet pipe in the liquid-cooled wire, thereby avoiding the increase of the overall size of the liquid-cooled wire to improve space utilization.

[0055] The conductor 31 corresponding to the liquid inlet pipe 21 refers to a conductor that is inserted into the second channel 211 of the liquid inlet pipe 21 or is sleeved outside the liquid inlet pipe 21. Similarly, the conductor 31 corresponding to the liquid outlet pipe 22 refers to a conductor that is inserted into the third channel 221 of the liquid outlet pipe 22 or is sleeved outside the liquid outlet pipe 22. In addition, since the positive current and the negative current passing through the liquid cooling wire are equal, the sum of the cross-sectional areas of the conductor 31 for passing the positive current is equal to the sum of the cross-sectional areas of the conductor 31 for passing the negative current, so as to ensure the performance of the liquid cooling wire.

[0056] In one embodiment, the number of the liquid cooling tube group 2 and the conductor group 3 is one group. Figure 1 As shown, one conductor 31 is sleeved outside the liquid inlet pipe 21, and the other conductor 31 is sleeved outside the liquid outlet pipe 22; or Figure 2 As shown, one conductor 31 is disposed in the second channel 211, and the other conductor 31 is disposed in the third channel 221. Moreover, the cross-sectional areas of the two conductors 31 are equal.

[0057] In another embodiment, the number of the liquid cooling tube group 2 and the number of the conductor group 3 are both two. Figure 3As shown, each conductor 31 is sleeved outside any liquid inlet pipe 21 or liquid outlet pipe 22; or Figure 4 As shown, each conductor 31 is arranged in any second channel 211 or third channel 221. Moreover, in the two conductor groups 3, the sum of the cross-sectional areas of the two conductors 31 for passing the positive current is equal to the sum of the cross-sectional areas of the two conductors 31 for passing the negative current. Specifically, the liquid cooling tube group 2 includes a first liquid cooling tube group 2a and a second liquid cooling tube group 2b, the first liquid cooling tube group 2a includes a first liquid inlet pipe 21a and a first liquid outlet pipe 22a, and the second liquid cooling tube group 2b includes a second liquid inlet pipe 21b and a second liquid outlet pipe 22b. The two conductor groups 3 include a total of four conductors 31, and the four conductors 31 are arranged one-to-one with the first liquid inlet pipe 21a, the first liquid outlet pipe 22a, the second liquid inlet pipe 21b and the second liquid outlet pipe 22b. For example, the two conductors 31 of one conductor group 3 may correspond to the first liquid inlet pipe 21a and the first liquid outlet pipe 22a respectively, and the two conductors 31 of another conductor group 3 may correspond to the second liquid inlet pipe 21b and the second liquid outlet pipe 22b respectively; or, the two conductors 31 of one conductor group 3 may correspond to the first liquid inlet pipe 21a and the second liquid inlet pipe 21b respectively, and the two conductors 31 of another conductor group 3 may correspond to the first liquid outlet pipe 22a and the second liquid outlet pipe 22b respectively; or, the two conductors 31 of one conductor group 3 may correspond to the first liquid inlet pipe 21a and the second liquid outlet pipe 22b respectively, and the two conductors 31 of another conductor group 3 may correspond to the first liquid outlet pipe 22a and the second liquid inlet pipe 21b respectively.

[0058] Of course, in other embodiments, the number of the liquid cooling tube groups 2 and the conductor groups 3 may also be three, four or more groups, and each conductor 31 is sleeved outside any liquid inlet pipe 21 or liquid outlet pipe 22, or each conductor 31 is passed through any second channel 211 or third channel 221. Moreover, among the multiple conductor groups 3, the sum of the cross-sectional areas of the multiple conductors 31 for passing the positive current is equal to the sum of the cross-sectional areas of the multiple conductors 31 for passing the negative current.

[0059] like Figure 1 As shown, the liquid cooling wire also includes at least one cable 4 arranged in the first channel 11, and the cable 4 includes at least one of a signal line, a control line and a ground line. The signal line is used to transmit signals between the charging pile and the device connected to the charging gun, the control line is used to control the operation of the device, and the ground line is used to introduce leakage current into the ground to ensure the safety of the device.

[0060] like Figure 1 As shown, the liquid-cooled wire also includes a wrapping member 5 attached to the inner circumferential wall of the outer sheath 1. The wrapping member 5 is used to tighten and fix the liquid-cooling tube group 2 and the cable 4, and can isolate the liquid-cooling wire from the external structure, reduce the interference of the external structure on the conductor group 3 and the cable 4 signal, and ensure the stability and accuracy of the signal transmission of the conductor group 3 and the cable 4.

[0061] like Figure 1 As shown, the liquid-cooled wire further includes a tensile member 6 filled in the first channel 11. The tensile member 6 is used to increase the strength of the liquid-cooled wire, so that the liquid-cooled wire has better tensile resistance and impact resistance, thereby extending the service life of the liquid-cooled wire and improving performance stability.

[0062] like Figures 1 to 4 As shown, the cross-sectional areas of the two conductors 31 corresponding to the liquid inlet pipe 21 and the liquid outlet pipe 22 of the same group are equal. It can be understood that the heat generation power P of the conductor 31 per unit time is equal to I 2 R=I 2 ·(ρ 导 ·L / S), where I is the current passing through the conductor 31, R is the resistance of the conductor 31, and ρ 导 is the resistivity of the conductor 31, L is the length of the conductor 31, S is the cross-sectional area of ​​the conductor 31, and I, R, ρ can be obtained by measurement or simulation. 导 , L, and S. That is, when the lengths L of the conductors 31 of the same material are equal and the currents I passing through the conductors 31 are equal, the heat generation power P of the conductors 31 per unit time is related to the cross-sectional area S of the conductors 31. Therefore, the heat generation power P per unit time of two conductors 31 with equal cross-sectional areas is equal, so that the user can adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 of the same group.

[0063] like Figure 1 As shown, taking one of the liquid cooling tube groups 2 as an example, the cooling liquid in the second channel 211 and the corresponding conductor 31 conduct heat transfer by convection to remove the heat generated by the conductor 31 W1=h1·A1·(T DC1 -T1), expressed as formula (1); the heat generated by the conductor 31 is carried away by the convective heat exchange between the coolant in the third channel 221 and the corresponding conductor 31 W2=h2·A2·(T DC2 -T2), recorded as formula (2). Wherein, h1 is the convection heat transfer coefficient between the coolant in the second channel 211 and the corresponding conductor 31, h2 is the convection heat transfer coefficient between the coolant in the third channel 221 and the corresponding conductor 31, A1 is the convection contact area between the coolant in the second channel 211 and the corresponding conductor 31, A2 is the convection contact area between the coolant in the third channel 221 and the corresponding conductor 31, T DC1 is the temperature of the conductor 31 corresponding to the liquid inlet pipe 21, T DC2 is the temperature of the conductor 31 corresponding to the liquid outlet pipe 22, T1 is the temperature of the coolant in the second channel 211, and T2 is the temperature of the coolant in the third channel 221. The specific values ​​of T1 and T2 can be obtained by measurement or simulation.

[0064] Furthermore, when the liquid inlet pipe 21 and the liquid outlet pipe 22 are circular pipes or annular pipes, the convective heat transfer coefficient between the coolant in the second channel 211 and the corresponding conductor 31 is h1=(Nu1·λ) / d1, which is expressed as formula (3); the convective heat transfer coefficient between the coolant in the third channel 221 and the corresponding conductor 31 is h2=(Nu2·λ) / d2, which is expressed as formula (4). Wherein, Nu1 is the Nusselt number of the coolant in the second channel 211, Nu2 is the Nusselt number of the coolant in the third channel 221, λ is the thermal conductivity of the coolant, and the specific value of λ can be obtained by measurement or simulation. Therefore, after substituting formula (3) and formula (4) into formula (1) and formula (2) respectively, W1=(Nu1·λ) / d1·A1·(T DC1 -T1), W2=(Nu2·λ) / d2·A2·(T DC2 -T2).

[0065] In order to ensure the uniformity of heat dissipation of the conductor 31 by the coolant in the second channel 211 and the coolant in the third channel 221, it is necessary to control the heat W1 of the conductor 31 to be equal to the heat W2 of the conductor 31 to be equal to ... DC1 and the temperature T of the conductor 31 corresponding to the liquid outlet pipe 22 DC2 Also equal, that is, T DC1 =T DC2 . And, you can set T DC1 =T DC2 =T DC , T DC It is the preset temperature of the conductor 31, that is, the temperature that the conductor 31 needs to reach after being cooled and dissipated by the coolant, which is set by the user. The temperature can be set according to the actual size of the liquid-cooled wire, the use environment, etc.

[0066] Therefore, we can get: (Nu1·λ) / d1·A1·(T DC -T1)=(Nu2·λ) / d2·A2·(T DC -T2); after simplification, we get: (Nu1·A1 / d1) / (Nu2·A2 / d2)=(T DC -T2) / (T DC -T1), expressed as formula (5);

[0067] That is, when the relationship between the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 in the same group satisfies formula (5), it is possible to make the coolant in the second channel 211 and the coolant in the third channel 221 uniformly dissipate heat to the conductor 31. Therefore, formula (5) can facilitate the user to obtain the relationship between the diameter d2 of the third channel 221 and the diameter d1 of the second channel 211, so as to facilitate the user to adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 in the same group, thereby improving the performance of the liquid-cooled wire and extending its service life.

[0068] In one embodiment, since the Reynolds number Re of the coolant in the second channel 211 and the third channel 221 is usually greater than 4000, that is, turbulent flow, the Nusselt number Nu1 of the coolant in the second channel 211 is usually a function of the Reynolds number Re and the Prandtl number Pr, that is, Nu1 satisfies:

[0069] Nu1=C·Re1 m ·Pr n =C·(ρ·v1·d1 / μ) m ·(μ·Cp / λ) n , recorded as formula (6);

[0070] Similarly, the Nusselt number Nu2 of the coolant in the third channel 221 satisfies:

[0071] Nu2=C·Re2 m ·Pr n =C·(ρ·v2·d2 / μ) m ·(μ·Cp / λ) n , recorded as formula (7);

[0072] Among them, ρ is the density of the coolant, v1 is the flow rate of the coolant in the second channel 211, v2 is the flow rate of the coolant in the third channel 221, μ is the dynamic viscosity of the coolant, Cp is the specific heat capacity of the coolant, C, m, and n are constants, and the specific values ​​of ρ, v1, v2, μ, and Cp can be obtained through measurement or simulation.

[0073] That is to say, the values ​​of Nu1 and Nu2 are related to d1 and d2. Substituting formula (6) and formula (7) into formula (5), we can get the following after simplification: ((v1·d1) m ·A1 / d1) / ((v2·d2) m ·A2 / d2)=(T DC -T2) / (T DC-T1), recorded as formula (8). Therefore, the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211 in the same group can be obtained more accurately through formula (8), which further facilitates the user to adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 in the same group, and also makes the adjustment result more accurate.

[0074] Of course, in other embodiments, the Nusselt number Nu1 of the coolant in the second channel 211 and the Nusselt number Nu2 of the coolant in the third channel 221 may be obtained or estimated by other methods such as experimental measurement or computational fluid dynamics simulation, and the embodiments of the present invention do not impose specific limitations thereto.

[0075] In one embodiment, when each conductor 31 is disposed in any second channel 211 or third channel 221, generally, the convection contact area A1 between the coolant in the second channel 211 and the corresponding conductor 31 is equal to π·d3·L, and the convection contact area A2 between the coolant in the third channel 221 and the corresponding conductor 31 is equal to π·d3·L, where d3 is the diameter of the conductor 31, and the specific value of d3 can be obtained by measurement or simulation. In this case, A1=A2, so after simplifying formula (8), it can be obtained: ((v1·d1) m / d1) / ((v2·d2) m / d2)=(T DC -T2) / (T DC -T1).

[0076] In another embodiment, when each conductor 31 is sleeved outside any liquid inlet pipe 21 or liquid outlet pipe 22, the convection contact area A1 between the coolant in the second channel 211 and the corresponding conductor 31 is generally π·d1·L, which is expressed as formula (9); the convection contact area A2 between the coolant in the third channel 221 and the corresponding conductor 31 is π·d2·L, which is expressed as formula (10). Substituting formula (9) and formula (10) into formula (8), we can obtain: (v1·d1) m / (v2·d2) m =(T DC -T2) / (T DC -T1), that is, ((v1 / v2)·(d1 / d2)) m =(T DC -T2) / (T DC -T1), recorded as formula (11). Since the coolant flow rate q remains unchanged, that is, q=v1·0.25·π·d1 2= v2 0.25 π d2 2 , so v1 / v2=(d2 / d1) 2, recorded as formula (12). After substituting formula (12) into formula (11), we can get: (d2 / d1) m =(T DC -T2) / (T DC -T1).

[0077] Specifically, when the coolant is water, the constant C=0.023, m=0.8, n=0.4, and the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 of the same group satisfy: (d2 / d1) 0.8 =(T DC -T2) / (T DC -T1).

[0078] like Figure 5 As shown, an embodiment of the present invention further provides a design method for a liquid cooling wire, which is used for the above-mentioned liquid cooling wire. The design method for the liquid cooling wire comprises the steps of:

[0079] S1000. Obtain a liquid cooling wire model;

[0080] S2000. Independently adjust each group of liquid cooling tube groups 2: adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 so that the diameter d1 of the second channel 211 is larger than the diameter d2 of the third channel 221 .

[0081] In step S1000, a conventional liquid-cooling wire can be designed in the simulation device. For example, the liquid-cooling wire includes an outer sheath 1, at least one group of liquid-cooling tube groups 2 and at least one group of conductor groups 3. Each group of liquid-cooling tube groups 2 includes a liquid inlet pipe 21 and a liquid outlet pipe 22 of equal diameter. Each group of conductor groups 3 includes two conductors 31. Each conductor 31 is inserted into the second channel 211 of any liquid inlet pipe 21 or the third channel 221 of the liquid outlet pipe 22; or, each conductor 31 is sleeved outside any liquid inlet pipe 21 or liquid outlet pipe 22.

[0082] In step S2000, each group of liquid-cooling tube groups 2 is adjusted independently, and by adjusting the diameter d1 of the second channel 211 of the same group to be larger than the diameter d2 of the third channel 221, the flow rate of the coolant in the second channel 211 is made smaller than the flow rate of the coolant in the third channel 221, thereby improving the heat exchange effect between the coolant in the third channel 221 and the conductor 31 corresponding to the liquid outlet pipe 22, so that each group of liquid-cooling tube groups 2 can improve the uniformity of heat dissipation of the conductor 31 by the coolant in the second channel 211 and the coolant in the third channel 221.

[0083] like Figure 6 As shown, specifically, in step S200, adjusting the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 so that the diameter d1 of the second channel 211 is larger than the diameter d2 of the third channel 221 also includes the steps of:

[0084] S210. Obtaining the preset temperature T of the conductor 31 DC , the coolant temperature T1 in the second channel 211 and the coolant temperature T2 in the third channel 221;

[0085] S220. Based on the preset temperature T of the conductor 31 DC , the coolant temperature T1 in the second channel 211 and the coolant temperature T2 in the third channel 221, and obtaining the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211;

[0086] S230 . Based on the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211 , adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 .

[0087] In step S210, the preset temperature T of the conductor 31 is DC The temperature that the conductor 31 needs to reach after being cooled by the coolant is set by the user. The temperature can be set according to the actual size of the liquid-cooled wire, the use environment, etc. In addition, the specific values ​​of the coolant temperature T1 in the second channel 211 and the coolant temperature T2 in the third channel 221 can be obtained by measurement or simulation.

[0088] In step S220 and step S230, after obtaining the proportional relationship between the diameter d2 of the third channel 221 and the diameter d1 of the second channel 211, it is further convenient for the user to adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 in the same group, and the adjustment result is also made more accurate.

[0089] like Figure 6 As shown, when the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211 is constant, the diameter d2 of the third channel 221 and the diameter d1 of the second channel 211 can have a variety of different values, so after step S230, the following steps are further included:

[0090] S240. Obtain the actual temperatures of the two conductors 31 corresponding to the liquid cooling tube group 2;

[0091] S250. Determine whether the actual temperatures of the two conductors 31 are equal to the preset temperature T of the conductor 31 DC ;

[0092] S251. If yes, then complete the design;

[0093] S252 . If not, loop through the steps of adjusting the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 , so that the diameter d1 of the second channel 211 is larger than the diameter d2 of the third channel 221 .

[0094] In step S240 , the actual temperatures of the two conductors 31 corresponding to the liquid cooling tube group 2 may be obtained by measurement or simulation.

[0095] In step S250, when the actual temperatures of the two conductors 31 are both equal to the preset temperature T DC , it means that under the current diameter d1 of the second channel 211 and the diameter d2 of the third channel 221, the coolant in the second channel 211 and the coolant in the third channel 221 can achieve uniform heat dissipation for the two conductors 31, meet the design requirements, and complete the design. When the actual temperature of any conductor 31 is not equal to the preset temperature T of the conductor 31 DC , it means that under the current diameter d1 of the second channel 211 and the diameter d2 of the third channel 221, the coolant in the second channel 211 and the coolant in the third channel 221 cannot achieve uniform heat dissipation of the two conductors 31. Therefore, it is necessary to continue to adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 while satisfying the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211 until the actual temperatures of the two conductors 31 are equal to the preset temperature T of the conductor 31. DC .

[0096] In step S220, the following steps are also included:

[0097] S221. Based on formula (5): (Nu1·A1 / d1) / (Nu2·A2 / d2)=(T DC -T2) / (T DC -T1), obtaining the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211;

[0098] Among them, Nu1 is the Nusselt number of the coolant in the second channel 211, Nu2 is the Nusselt number of the coolant in the third channel 221, A1 is the convection contact area between the coolant in the second channel 211 and the corresponding conductor 31, and A2 is the convection contact area between the coolant in the third channel 221 and the corresponding conductor 31.

[0099] Thus, formula (5) can facilitate the user to obtain the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211, and adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 according to the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211, so that the coolant in the second channel 211 and the coolant in the third channel 221 can evenly dissipate heat from the conductor 31, thereby improving the performance of the liquid-cooled wire and extending its service life.

[0100] In step S221, the following steps are also included:

[0101] Based on formula (6) and formula (7): Nu1 = C·(ρ·v1·d1 / μ) m ·(μ·Cp / λ) n ,Nu2=C·(ρ·v2·d2 / μ) m ·(μ·Cp / λ) n , obtaining the Nusselt number Nu1 of the coolant in the second channel 211 and the Nusselt number Nu2 of the coolant in the third channel 221;

[0102] Wherein, ρ is the density of the coolant, v1 is the flow rate of the coolant in the second channel 211, v2 is the flow rate of the coolant in the third channel 221, μ is the dynamic viscosity of the coolant, Cp is the specific heat capacity of the coolant, λ is the thermal conductivity of the coolant, and C, m, and n are constants.

[0103] Thus, formula (6) and formula (7) enable the user to more accurately obtain the ratio of the diameter d2 of the third channel 221 to the diameter d1 of the second channel 211, which further facilitates the user to adjust the diameter d1 of the second channel 211 and the diameter d2 of the third channel 221 in the same group, and also makes the adjustment result more accurate.

[0104] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A method for designing a liquid-cooling wire, the liquid-cooling wire comprising: An outer sheath (1) is provided with a first channel (11); at least one group of liquid cooling tube groups (2) is arranged in the first channel (11), each group of the liquid cooling tube groups (2) comprises a liquid inlet pipe (21) and a liquid outlet pipe (22), the liquid inlet pipe (21) is provided with a second channel (211), the liquid outlet pipe (22) is provided with a third channel (221), the second channel (211) and the third channel (221) in the same group are respectively used for passing cooling liquids flowing in opposite directions, and the diameter d1 of the second channel (211) in the same group is larger than that of the third channel (221). The diameter d2 of the second channel (211) is such that the flow rate of the coolant in the second channel (211) is less than the flow rate of the coolant in the third channel (221); and at least one conductor group (3), each conductor group (3) comprising two conductors (31), the two conductors (31) in the same group being used to pass a positive current and a negative current, respectively; wherein each conductor (31) is arranged in any one of the second channel (211) or the third channel (221); or each conductor (31) is arranged outside any one of the liquid inlet pipe (21) or the liquid outlet pipe (22); The design method of the liquid cooling wire comprises the steps of: Get the liquid cooling wire model; Independently adjusting each group of liquid cooling tube groups (2): adjusting the diameter d1 of the second channel (211) and the diameter d2 of the third channel (221), so that the diameter d1 of the second channel (211) is greater than the diameter d2 of the third channel (221); The step of adjusting the diameter d1 of the second channel (211) and the diameter d2 of the third channel (221) so that the diameter d1 of the second channel (211) is larger than the diameter d2 of the third channel (221) further includes the steps of: Obtaining a preset temperature T of the conductor (31) DC , a coolant temperature T1 in the second channel (211) and a coolant temperature T2 in the third channel (221); Based on the preset temperature T of the conductor (31) DC , a coolant temperature T1 in the second channel (211) and a coolant temperature T2 in the third channel (221), and obtaining a ratio of a diameter d2 of the third channel (221) to a diameter d1 of the second channel (211); Based on the ratio of the diameter d2 of the third channel (221) to the diameter d1 of the second channel (211), the diameter d1 of the second channel (211) and the diameter d2 of the third channel (221) are adjusted.

2. The method for designing a liquid cooling wire according to claim 1, characterized in that: After the step of adjusting the diameter d1 of the second channel (211) and the diameter d2 of the third channel (221) based on the ratio of the diameter d2 of the third channel (221) to the diameter d1 of the second channel (211), the method further comprises the steps of: Obtaining the actual temperatures of the two conductors (31) corresponding to the liquid cooling tube group (2); Determine whether the actual temperatures of the two conductors (31) are both equal to the preset temperature T of the conductors (31) DC ; If yes, the design is completed; If not, the step of adjusting the diameter d1 of the second channel (211) and the diameter d2 of the third channel (221) based on the ratio of the diameter d2 of the third channel (221) to the diameter d1 of the second channel (211) is executed in a loop.

3. The design method of the liquid cooling wire according to claim 2, characterized in that: Each of the conductors (31) is sleeved outside any of the liquid inlet pipes (21) or the liquid outlet pipes (22); in the step, based on the preset temperature T of the conductor (31), DC , the coolant temperature T1 in the second channel (211) and the coolant temperature T2 in the third channel (221), and obtaining the ratio of the diameter d1 of the second channel (211) to the diameter d2 of the third channel (221), further comprising the steps of: Based on the formula: (Nu1·A1 / d1) / (Nu2·A2 / d2)=(T DC -T2) / (T DC -T1), obtaining the ratio of the diameter d2 of the third channel (221) to the diameter d1 of the second channel (211); Wherein, Nu1 is the Nusselt number of the coolant in the second channel (211), Nu2 is the Nusselt number of the coolant in the third channel (221), A1 is the convection contact area between the coolant in the second channel (211) and the corresponding conductor (31), and A2 is the convection contact area between the coolant in the third channel (221) and the corresponding conductor (31).

4. The method for designing a liquid cooling wire according to claim 3, characterized in that: Based on the formula described in the steps: (Nu1·A1 / d1) / (Nu2·A2 / d2)=(T DC -T2) / (T DC -T1), obtaining the ratio of the diameter d2 of the third channel (221) to the diameter d1 of the second channel (211), further comprising the steps of: Based on the formula: Nu1=C·(ρ·v1·d1 / μ) m ·(μ·Cp / λ) n ,Nu2=C·(ρ·v2·d2 / μ) m ·(μ·Cp / λ) n , obtaining the Nusselt number Nu1 of the coolant in the second channel (211) and the Nusselt number Nu2 of the coolant in the third channel (221); Wherein, ρ is the density of the coolant, v1 is the flow rate of the coolant in the second channel (211), v2 is the flow rate of the coolant in the third channel (221), μ is the dynamic viscosity of the coolant, Cp is the specific heat capacity of the coolant, λ is the thermal conductivity of the coolant, and C, m, and n are constants.

5. A liquid-cooled wire, based on the design method of the liquid-cooled wire according to any one of claims 2 to 4, characterized in that: include: An outer sheath (1) having a first passage (11); At least one group of liquid cooling tube groups (2) is arranged in the first channel (11), each group of the liquid cooling tube groups (2) comprises a liquid inlet pipe (21) and a liquid outlet pipe (22), the liquid inlet pipe (21) is provided with a second channel (211), the liquid outlet pipe (22) is provided with a third channel (221), the second channel (211) and the third channel (221) in the same group are respectively used for passing cooling liquids flowing in opposite directions, and the diameter d1 of the second channel (211) in the same group is greater than the diameter d2 of the third channel (221), and the flow rate of the cooling liquid in the second channel (211) is less than the flow rate of the cooling liquid in the third channel (221); and, At least one conductor group (3), each conductor group (3) comprising two conductors (31), and the two conductors (31) in the same group are used to pass positive current and negative current respectively; Wherein, each of the conductors (31) is inserted into any of the second channels (211) or the third channels (221); or, each of the conductors (31) is sleeved outside of any of the liquid inlet pipes (21) or the liquid outlet pipes (22).

6. The liquid-cooled wire according to claim 5, characterized in that: The cross-sectional areas of the two conductors (31) corresponding to the liquid inlet pipe (21) and the liquid outlet pipe (22) in the same group are equal.

7. The liquid-cooled wire according to claim 6, characterized in that: Each of the conductors (31) is sleeved outside any of the liquid inlet pipes (21) or the liquid outlet pipes (22); the diameter d1 of the second channel (211) and the diameter d2 of the third channel (221) in the same group satisfy: <h2 style=";text-align:left;direction:ltr">(Nu1·A1 / d1) / (Nu2·A2 / d2)=(T<h2 style=";text-align:left;direction:ltr"> DC <h2 style=";text-align:left;direction:ltr"> -T2) / (T<h2 style=";text-align:left;direction:ltr"> DC <h2 style=";text-align:left;direction:ltr"> -T1); wherein Nu1 is the Nusselt number of the coolant in the second channel (211), Nu2 is the Nusselt number of the coolant in the third channel (221), A1 is the convection contact area between the coolant in the second channel (211) and the corresponding conductor (31), A2 is the convection contact area between the coolant in the third channel (221) and the corresponding conductor (31), and T DC is the preset temperature of the conductor (31), T1 is the temperature of the coolant in the second channel (211), and T2 is the temperature of the coolant in the third channel (221).

8. The liquid-cooled wire according to claim 7, characterized in that: The Nusselt number Nu1 of the coolant in the second channel (211) satisfies: Nu1=C·(ρ·v1·d1 / μ) m (μ Cp / l) n ; The Nusselt number Nu2 of the coolant in the third channel (221) satisfies: Nu2=C·(ρ·v2·d2 / μ) m (μ Cp / l) n ; Wherein, ρ is the density of the coolant, v1 is the flow rate of the coolant in the second channel (211), v2 is the flow rate of the coolant in the third channel (221), μ is the dynamic viscosity of the coolant, Cp is the specific heat capacity of the coolant, λ is the thermal conductivity of the coolant, and C, m, and n are constants.

9. The liquid-cooled wire according to any one of claims 5 to 8, characterized in that: The liquid-cooling wire further comprises at least one cable (4) arranged in the first channel (11), the cable (4) comprising at least one of a signal line, a control line and a ground line; and / or, The liquid-cooled wire further comprises a wrapping member (5) attached to the inner circumferential wall of the outer sheath (1); and / or, The liquid-cooled wire further comprises a tensile member (6) filled in the first channel (11).

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