A pulsating heat pipe radiator specially designed for high power density servo drives

Abstract

The present invention provides a pulsating heat pipe radiator specially used for a high-power density servo drive, which is used to solve the technical problems in the prior art that the heat pipe radiator is difficult to produce and install, difficult to reduce the size, and the heat dissipation effect is affected by the installation angle of the heat pipe. The radiator comprises: a pulsating heat pipe, an evaporating end substrate, a condensing end substrate and a fixing rod; wherein the evaporating end substrate is provided with an evaporating end groove, and the evaporating end of the pulsating heat pipe is fixed in the evaporating end groove; the evaporating end substrate is provided with a fixing hole; the condensing end substrate is provided with a condensing end groove, and the condensing end of the pulsating heat pipe is fixed in the condensing end groove; the technical scheme of the present invention is implemented, a thin-walled pulsating heat pipe is provided, the coolant can flow by itself, and the radiator can be installed at any angle; an evaporating end substrate, a condensing end substrate and a fixing rod are provided to fix and protect the pulsating heat pipe, and a fixing through hole is provided to reduce the difficulty of radiator installation and extend the life of the radiator; the radiator uses multiple or double rows of pulsating heat pipes to improve heat exchange efficiency and reduce the volume of the radiator.

Description

Technical Field

[0001] The invention relates to the field of servo motor driver body design, and in particular to a pulsating heat pipe radiator dedicated to a high power density servo driver. Background Art

[0002] High-power-density servo drives are extremely small in size, much smaller than ordinary servo drives or motor drives, and their power density is increased exponentially. The circuits therein generate a lot of heat when operating at high frequency, which needs to be dissipated in time to ensure that the device temperature is within a safe operating range.

[0003] In the prior art, the best heat dissipation solution for high power density servo drives is to use heat pipe heat dissipation technology. In actual applications, servo drives may be installed in various positions and angles. The radiator installation inclination angle has a great impact on whether the heat pipe can work normally or whether it works in the best heat transfer state; the capillary inner cavity of the heat pipe is difficult to process and has high requirements for installation. If the pipe is accidentally squeezed during installation, it may cause capillary damage; traditional heat pipes are subject to factors such as manufacturing process and heat transfer effect, and it is difficult to reduce the size and volume.

[0004] Therefore, a pulsating heat pipe radiator which can be installed at any angle, is safe and reliable, and has a small size is needed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention discloses a pulsating heat pipe radiator for a high power density servo drive. The technical solution of the present invention is implemented as follows:

[0006] A pulsating heat pipe radiator specially used for a high power density servo drive comprises: a pulsating heat pipe, an evaporation end substrate, a condensation end substrate and a fixing rod; wherein the evaporation end substrate is provided with an evaporation end groove, and the evaporation end of the pulsating heat pipe is fixed in the evaporation end groove; the evaporation end substrate is provided with a fixing hole, and the evaporation end substrate is fixed to the high power density servo drive through the fixing hole; the condensation end substrate is provided with a condensation end groove, and the condensation end of the pulsating heat pipe is fixed in the condensation end groove; the fixing rod is arranged between the evaporation end substrate and the condensation end substrate to fix the relative positions of the evaporation end substrate and the condensation end substrate.

[0007] Preferably, the pulsating heat pipe is fixed to the evaporation end substrate and the condensation end substrate by vacuum brazing.

[0008] Preferably, the pulsating heat pipe is a double-row pipe.

[0009] Preferably, there are multiple pulsating heat pipes.

[0010] Preferably, the fixing rod is made of a heat insulating material.

[0011] Preferably, the pulsating heat pipe radiator dedicated to the high power density servo drive further comprises a heat exchange substrate, which is arranged on the outside of the evaporation end substrate and is made of a ceramic material with a high thermal conductivity.

[0012] Preferably, the number of the evaporation end substrates is 2, and the evaporation end of the pulsating heat pipe is enclosed in the two evaporation end substrates; the number of the condensation end substrates is 2, and the condensation end of the pulsating heat pipe is enclosed in the two condensation end substrates.

[0013] Preferably, the inner diameter of the pulsating heat pipe is 0.5-3 mm.

[0014] Preferably, the thickness of the evaporation end substrate and the condensation end substrate does not exceed 10 mm.

[0015] Preferably, the coolant is one or more selected from water, methanol, ethanol, and Freon.

[0016] The implementation of the technical solution of the present invention can solve the technical problems in the prior art that the production and installation of heat pipe radiators are difficult, the size is difficult to reduce, and the heat dissipation effect is affected by the installation angle of the heat pipes; by implementing the technical solution of the present invention, a thin-walled pulsating heat pipe is set, the coolant can flow on its own, and the radiator can be installed at any angle; an evaporating end substrate, a condensing end substrate and a fixing rod are set to fix and protect the pulsating heat pipe, and a fixed through hole is set to reduce the difficulty of radiator installation and extend the life of the radiator; the radiator uses multiple pulsating heat pipes or uses double rows of pulsating heat pipes to improve the heat exchange efficiency of the radiator and reduce the size of the radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only several embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a top view of the evaporation end substrate, the condensation end substrate and the fixing member after being connected in Embodiment 1, Embodiment 2, Embodiment 3 and Embodiment 4 of the present invention;

[0019] Figure 2 This is a schematic diagram of the heat sink structure of Example 1 of the present invention;

[0020] Figure 3 Schematic diagram of the pulsating heat pipe structure of Example 2 of the present invention;

[0021] Figure 4 This is a schematic diagram of the pulsating heat pipe structure of Example 3 of the present invention;

[0022] Figure 5 Schematic diagram of the pulsating heat pipe structure of Example 4 of the present invention.

[0023] In the above drawings, the figure numbers represent:

[0024] 1- pulsating heat pipe; 2- evaporation end substrate; 3- condensation end substrate; 4- fixing rod; 5- evaporation end groove; 6- condensation end groove; 7- fixing hole; 8- inner pulsating heat pipe; 9- outer pulsating heat pipe; 10- lower pulsating heat pipe; 11- upper pulsating heat pipe; 12- heat exchange substrate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example 1

[0027] In a specific embodiment of the present invention, a pulsating heat pipe radiator dedicated to a high power density servo drive, such as Figure 1 and Figure 2 As shown, it includes: a pulsating heat pipe 1, an evaporating end substrate 2, a condensing end substrate 3 and a fixing rod 4; wherein, the evaporating end substrate 2 is provided with an evaporating end groove 5, and the evaporating end of the pulsating heat pipe 1 is fixed in the evaporating end groove 5; the evaporating end substrate 2 is provided with a fixing hole 7, and the evaporating end substrate 2 is fixed to the high power density servo driver through the fixing hole 7; the condensing end substrate 3 is provided with a condensing end groove 6, and the condensing end of the pulsating heat pipe 1 is fixed in the condensing end groove 6; the fixing rod 4 is arranged between the evaporating end substrate 2 and the condensing end substrate 3 to fix the relative positions of the evaporating end substrate 2 and the condensing end substrate 3.

[0028] The interior of the pulsating heat pipe 1 is a vacuum environment, and is equipped with a certain amount of coolant. During the use of the radiator, the coolant will evaporate and generate gas after being heated, so that the coolant section and the gas section are randomly distributed inside the pulsating heat pipe 1. The evaporation end substrate 2 and the condensation end substrate 3 can be made of metal materials such as aluminum alloy, which have good thermal conductivity and high structural strength. The outer side of the pulsating heat pipe 1 can be oxidized or provided with a protective layer to improve the strength and corrosion resistance of the pulsating heat pipe 1 and extend the overall life of the device. The pulsating heat pipe 1 is set as a thin-walled tube, which effectively improves the heat exchange speed, improves the heat dissipation effect, and can reduce the overall weight of the radiator, which is convenient for users to install and use. Users can set the pipe diameter and substrate thickness of the pulsating heat pipe 1 according to system heat dissipation requirements, installation area size, cost control and other factors to improve the compatibility of the device. The evaporation end substrate 2 and the condensation end substrate 3 can be manufactured using the same template, and with the structurally symmetrical pulsating heat pipe 1, it is easy to achieve large-scale production, improve production efficiency and effectively reduce the cost of the device. The diameter of the evaporation end groove 5 and the condensation end groove 6 can be set to the outer diameter of the pulsating heat pipe 1, so that the evaporation end groove 5 and the condensation end groove 6 can effectively clamp the pulsating heat pipe 1, reduce the damage caused by the pulsating heat pipe 1 hitting the surface of the evaporation end groove 5 and the condensation end groove 6 due to vibration during use of the device, and extend the life of the device. The evaporation end groove 5 and the condensation end groove 6 can also be provided with connecting structures such as clamps and grooves that match the pulsating heat pipe 1 to further fix the position of the pulsating heat pipe 1. During the use of the radiator, the evaporation end substrate 2 is connected and set in the high temperature area to absorb the heat in the high temperature area, and the condensation end substrate 3 is set in the normal temperature or low temperature area to dissipate heat.

[0029] The evaporation end of the pulsating heat pipe 1 arranged in the evaporation end substrate 2 absorbs heat from the high temperature zone, and the coolant in the evaporation end of the pulsating heat pipe 1 evaporates due to the heat, generating gas, the volume of the coolant section decreases, and the volume of the gas section increases. Due to the low density of the gas, the gas pressure of the gas section in the evaporation end of the pulsating heat pipe 1 continues to increase, which will drive the coolant section to flow. Correspondingly, the pulsating heat pipe 1 arranged in the condensation end substrate 3 dissipates heat in a low temperature environment, the volume of the coolant section in the pulsating heat pipe 1 continues to increase, the volume of the gas section continues to decrease and the pressure continues to decrease, and the coolant section will flow to the gas section. The coolant section and the gas section in the pulsating heat pipe 1 are randomly distributed, and finally flow stably along a certain direction of the pulsating heat pipe 1. Therefore, the coolant in the pulsating heat pipe 1 will flow automatically without the assistance of external force. In the prior art, liquid cooling equipment or air cooling equipment often needs to be equipped with a pump to drive the heat carrier. In this specific embodiment, there is no need to equip a heat carrier power system. The user places the installed evaporation end substrate 2 of the radiator in a high-temperature area. The coolant in the pulsating heat pipe 1 will automatically flow under the temperature difference without additional energy consumption, reducing the user's maintenance cost, and simplifying the radiator structure, which is conducive to reducing the volume of the radiator. The user sets the radiator parameters such as the inner diameter of the pulsating heat pipe 1, the length of the gas section, the length of the coolant section, and the type of coolant through data such as the high-temperature zone temperature, the low-temperature zone temperature, and the size of the heat dissipation area to optimize the heat dissipation effect. The radiator can be used in different environments and improve the compatibility of the radiator. The fixing hole 7 can be set as a screw hole, and the radiator and the high-power density servo driver are fixed by bolts. It is easy to install and disassemble, and can be quickly installed, which is convenient for users to replace or replenish the coolant of the radiator, reducing user maintenance costs.

[0030] The evaporation end substrate 2 and the condensation end substrate 3 can be connected to the fixing rod 4 using detachable connectors such as clips, screws, and bolts, so that the user can choose a fixing rod 4 of appropriate length according to the size of the evaporation end substrate 2, the size of the condensation end substrate 3, and the size of the pulsating heat pipe 1, so as to adapt to different heat dissipation environments and improve the compatibility of the radiator. The evaporation end substrate 2 and the condensation end substrate 3 are fixed by the fixing rod 4. The evaporation end substrate 2 and the condensation end substrate 3 can provide better support and protection for the pulsating heat pipe 1, so that the pulsating heat pipe 1 can not only be placed horizontally, but also can choose a more suitable installation angle according to the needs of the heat dissipation environment. Since the pulsating heat pipe 1 has a small diameter and the mass of the coolant contained therein is small, the gravity or centripetal force on the coolant has little effect on the heat dissipation effect, and the radiator can move, vibrate, and rotate with the heat dissipation body, thereby improving the reliability of the radiator.

[0031] In a preferred embodiment, Figure 1 and Figure 2As shown, the pulsating heat pipe 1 is fixed to the evaporation end substrate 2 and the condensation end substrate 3 by vacuum brazing, which greatly improves the connection strength between the pulsating heat pipe 1 and the evaporation end substrate 2 and the condensation end substrate 3. The pulsating heat pipe 1 is installed and the coolant is filled in advance. The user only needs to fix the radiator on the high power density servo drive through the fixing hole 7 on site to complete the installation, which reduces the time cost and labor cost of radiator installation.

[0032] In a preferred embodiment, Figure 1 and Figure 2 As shown, the fixing rod 4 is made of insulating material. The fixing rod 4 can be made of materials with poor thermal conductivity and high strength, such as high-strength plastic, to provide effective support for the radiator body, while being conducive to forming an insulating area between the condensing end substrate 3 and the heating end substrate, reducing the heat dissipation of the pulsating heat pipe 1 between the evaporating end substrate 2 and the condensing end substrate 3, resulting in the influence of the self-flow of the coolant in the pulsating heat pipe 1.

[0033] In a preferred embodiment, Figure 1 and Figure 2 As shown, the heat exchange substrate 12 is arranged outside the evaporation end substrate 2 and is made of a ceramic material with a high thermal conductivity. The back of the evaporation end substrate 2 can be set as a flat surface, and the evaporation end substrate 2 can evenly absorb the heat from the high temperature area. The main body of the high power density servo driver is a circuit board, and there are many pins, capacitors, chips and other structures on the surface, which is a non-flat surface. However, only part of the area on the high power density servo driver is often a heat concentrated generation area. Therefore, a heat exchange substrate 12 can be arranged outside the evaporation end substrate. The side of the heat exchange substrate 12 close to the evaporation end substrate is set as a plane, which fits with the evaporation end substrate 2. The side of the heat exchange substrate 12 away from the evaporation end is set according to the shape of the surface of the high power density servo driver that fits, so as to achieve the best heat exchange effect. By replacing the heat exchange substrates 12 of different specifications, shapes and materials, the radiator can be applied to different heat dissipation areas and improve the compatibility of the radiator. The heat exchange substrate 12 can use insulating materials to avoid short circuit of the radiator and improve the reliability and safety of the radiator.

[0034] In a preferred embodiment, Figure 1 and Figure 2As shown, there are two evaporation end substrates 2, and the evaporation end of the pulsating heat pipe 1 is enclosed in two evaporation end substrates 2; there are two condensation end substrates 3, and the condensation end of the pulsating heat pipe 1 is enclosed in two condensation end substrates 3. The protective and supporting effects of the evaporation end substrate 2 and the condensation end substrate 3 on the pulsating heat pipe 1 are further improved. The fixing holes 7 on the two evaporation end substrates 2 and the two condensation end substrates 3 can be set at corresponding positions to ensure that the corresponding fixing holes 7 overlap after the substrates are bonded. Compared with using one evaporation end substrate 2 and one condensation end substrate 3, only slightly longer bolts are needed to fix the heat dissipation device during the installation process. The installation process is simple, which can reduce the wear of the pulsating heat pipe 1 during use, extend the life of the device, and reduce the user's maintenance cost.

[0035] In a preferred embodiment, Figure 2 As shown, the inner diameter of the pulsating heat pipe 1 is 0.5-3mm. The smaller the inner diameter of the pulsating heat pipe 1, the smaller the volume of coolant that can be accommodated in the pulsating heat pipe 1, and the heat exchange capacity of the pulsating heat pipe 1 is reduced; the larger the inner diameter of the pulsating heat pipe 1, the larger the volume of coolant that can be accommodated in the pulsating heat pipe 1, and the heat exchange capacity of the pulsating heat pipe 1 is improved, but it is not conducive to the formation of a gas section isolating the coolant end in the pulsating heat pipe 1 during the evaporation of the coolant, which may affect the self-flow of the coolant. Users can set the inner diameter of the pipe according to parameters such as heat dissipation and coolant type to improve radiator compatibility and heat exchange efficiency.

[0036] In a preferred embodiment, Figure 1 and Figure 2 As shown, the thickness of the evaporation end substrate 2 and the condensation end substrate 3 does not exceed 10 mm. The thicker the evaporation end substrate 2 and the condensation end substrate 3, the higher the structural strength of the radiator, which is conducive to extending the life of the radiator; the thinner the evaporation end substrate 2 and the condensation end substrate 3, the faster the speed of heat transfer into and out of the pulsating heat pipe 1, and the better the heat exchange effect of the heat exchanger. The user can select the appropriate thickness of the evaporation end substrate 2 and the condensation end substrate 3 according to the size of the pulsating heat pipe 1, the type of heat exchange substrate 12, the radiator installation environment, angle, radiator weight and other parameters.

[0037] In a preferred embodiment, the coolant is one or more selected from water, methanol, ethanol, and freon. The types of coolants are relatively common, which is conducive to reducing costs for users. Users can select suitable single-component or mixed-component coolants according to parameters such as heat generation power in the high-temperature zone, temperature upper limit, temperature in the low-temperature zone, radiator specifications, and capacity. Users can calibrate coolant components suitable for different temperatures in advance according to the radiator model, reducing the time cost and labor cost of radiator installation.

[0038] Example 2

[0039] In a preferred embodiment, different from Example 1, Figure 1 and Figure 3 As shown, the pulsating heat pipe 1 is a double-row tube. In this specific embodiment, the double-row tubes are arranged in the same plane, and the width of the evaporation end slot 5 and the condensation end slot 6 is changed, so that the double-row tube type pulsating heat pipe 1 can be applied, which has little effect on the volume of the evaporation end substrate 2 and the condensation end substrate 3, but the effective volume in the pulsating heat pipe 1 is increased by nearly one-fold, which effectively improves the heat exchange efficiency of the radiator, facilitates the manufacture of a smaller radiator and improves the compatibility of the radiator. During the application of the radiator, due to the small area of ​​the heated end of the inner pulsating heat pipe 8, the temperature of the inner pulsating heat pipe 8 is lower than that of the outer pulsating heat pipe 9, which increases the temperature difference between the evaporation end and the condensation end of the pulsating heat pipe 1, which is conducive to increasing the flow rate of the coolant and improving the heat exchange efficiency.

[0040] Example 3

[0041] Different from Example 2, Figure 1 and Figure 4 As shown, the double-row tube structure is set as two layers, and the cooling channel and the evaporation end channel 5 increase in depth, so that the double-row tube can be installed. The area of ​​the condensation end substrate 3 and the evaporation end substrate 2 does not need to be changed, and the capacity of the coolant is nearly doubled, which greatly improves the heat exchange efficiency. During the use of the radiator, the evaporation end of the lower pulsating heat pipe 10 is closer to the evaporation end substrate 2, the coolant temperature in the lower pulsating heat pipe 10 is relatively high, and the temperature of the upper pulsating heat pipe 11 is relatively low. The temperature difference between the lower pulsating heat pipe 10 and the upper pulsating heat pipe 11 will produce a larger gas pressure difference, which is conducive to increasing the automatic flow speed of the coolant and improving the heat exchange efficiency.

[0042] Example 4

[0043] In a preferred embodiment, Figure 1 and Figure 5 As shown, different from Example 3, there are multiple pulsating heat pipes 1, and multiple pulsating heat pipes 1 are stacked. During use, the evaporation ends of multiple stacked pulsating heat pipes 1 can be vertically close to the high temperature zone, which is suitable for high-power density servo drives with a small bottom area but high height that can be installed above, improving the compatibility of the radiator, and multiple pulsating heat pipes 1 can be set to the same specifications, which is convenient for large-scale production of radiators.

[0044] It should be pointed out that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulsating heat pipe radiator for high power density servo drive, characterized in that: include: Pulsating heat pipe, evaporation end base plate, condensation end base plate and fixing rod; wherein, The evaporation end substrate is provided with an evaporation end slot, and the evaporation end of the pulsating heat pipe is fixed in the evaporation end slot; the evaporation end substrate is provided with a fixing hole, and the evaporation end substrate is fixed on the high power density servo driver through the fixing hole; The condensation end substrate is provided with a condensation end groove, and the condensation end of the pulsating heat pipe is fixed in the condensation end groove; The fixing rod is arranged between the evaporation end substrate and the condensation end substrate to fix the relative position of the evaporation end substrate and the condensation end substrate; The fixing rod is made of heat-insulating material; It also includes a heat exchange substrate, which is arranged on the outside of the evaporation end base plate and is made of a ceramic material with a high thermal conductivity.

2. The pulsating heat pipe radiator for high power density servo drive according to claim 1, characterized in that: The pulsating heat pipe is fixed on the evaporation end substrate and the condensation end substrate by vacuum brazing.

3. The pulsating heat pipe radiator for high power density servo drive according to claim 2, characterized in that: The pulsating heat pipe is a double-row pipe.

4. The pulsating heat pipe radiator for high power density servo drive according to claim 2, characterized in that: The number of the pulsating heat pipes is multiple.

5. The pulsating heat pipe radiator for high power density servo drive according to claim 1, characterized in that: The number of the evaporation end substrates is two, and the evaporation end of the pulsating heat pipe is enclosed in the two evaporation end substrates; the number of the condensation end substrates is two, and the condensation end of the pulsating heat pipe is enclosed in the two condensation end substrates.

6. The pulsating heat pipe radiator for high power density servo drive according to claim 5, characterized in that: The inner diameter of the pulsating heat pipe is 0.5-3 mm.

7. The pulsating heat pipe radiator for high power density servo drive according to claim 6, characterized in that: The thickness of the evaporation end substrate and the condensation end substrate does not exceed 10 mm.

8. The pulsating heat pipe radiator for high power density servo drive according to claim 7, characterized in that: The pulsating heat pipe is provided with a coolant, and the coolant is one or more selected from water, methanol, ethanol, and Freon.

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