A plate-type pulsating heat pipe radiator with integrated plate heat exchanger at the condensing end

Abstract

The present invention discloses a plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end, and relates to the field of heat exchange technology. It includes a plate-type pulsating heat pipe; a condensing section branch structure, the condensing section branch structure is connected to the plate-type pulsating heat pipe; a first cover plate, the first cover plate is connected between the plate-type pulsating heat pipe and the condensing section branch structure, the first cover plate is provided with a first condensation passage, the first cover plate and the plate-type pulsating heat pipe form the first condensation passage, and the first cover plate and the condensing section branch structure form a heat flow channel; a second cover plate, the second cover plate is provided on one side of the condensing section branch structure, a second condensation passage is provided on one side of the second cover plate, and the second cover plate and the condensing section branch structure form the second condensation passage. The plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end provided by the present invention combines the plate-type pulsating heat pipe with the plate heat exchanger, and increases the heat exchange area of ​​the radiator on the basis of the heat exchange of the plate-type pulsating heat pipe.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, and in particular to a plate-type pulsating heat pipe radiator with an integrated plate-type heat exchanger at a condensing end. Background Art

[0002] The pulsating heat pipe is a loop capillary filled with working fluid. The two ends of the pulsating heat pipe are the heating end and the condensing end, and the middle is the insulation end. The inside of the pulsating heat pipe is a vacuum environment. Since the inner diameter of the pulsating heat pipe is very small, the working fluid forms a vapor plug and a liquid plug in the tube. When the working fluid is heated at the heating end, nucleate boiling occurs on the inner wall of the heating end of the pulsating heat pipe, generating small bubbles. The internal pressure of the bubbles increases due to the increase in the temperature of the heating end, and the pressure drives the bubbles to move toward the condensing end. During the movement, the vapor plug merges and the liquid plug splits. At the condensing end, the working fluid releases heat to the environment, and the bubbles that rise to the condensing end of the pulsating heat pipe undergo phase change heat transfer, changing from gas to liquid. Due to the high density of the liquid, the liquid at the condensing end tends to move toward the heating end. In this way, the pulsating heat pipe forms a pressure difference between the condensing end and the heating end, driving the working fluid in the pulsating heat pipe to reciprocate between the heating end and the condensing end, and the heat is transferred from the heating end to the condensing end, realizing the heat transfer.

[0003] According to the different shapes, pulsating heat pipes are divided into plate-type pulsating heat pipes and tube-type pulsating heat pipes. Plate-type pulsating heat pipes are made by milling pipes of different shapes on a plate and then sealing them.

[0004] Currently, the plate-type pulsating heat pipes used in the market for electronic chips with high heat generation can only dissipate heat within the internal passages of the plate-type pulsating heat pipes during heat dissipation, and the limited heat exchange area causes insufficient heat exchange efficiency.

[0005] Therefore, it is necessary to provide a plate pulsating heat pipe radiator that combines a plate pulsating heat pipe with a plate heat exchanger to increase the heat exchange area of ​​the condensing end integrated plate heat exchanger on the basis of the plate pulsating heat pipe heat exchange. Summary of the invention

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end, comprising:

[0008] A plate-type pulsating heat pipe, the plate-type pulsating heat pipe comprising a substrate and a pulsating heat pipe microchannel, the pulsating heat pipe microchannel being arranged on the substrate;

[0009] A condensation section branch structure, wherein a boss is provided at the bottom end of the condensation section branch structure, the boss is connected to the outside of the plate-type pulsating heat pipe, and a branch microchannel is provided on one side of the condensation section branch structure close to the plate-type pulsating heat pipe;

[0010] A first cover plate, wherein a first condensation microchannel is disposed on one side of the first cover plate close to the plate-type pulsating heat pipe, the first cover plate is connected between the plate-type pulsating heat pipe and the condensation section branch structure, and is located at the top of the boss, a first condensation passage is formed between the first cover plate and the plate-type pulsating heat pipe, and a heat flow channel is formed between the first cover plate and the condensation section branch structure;

[0011] A second cover plate, a second condensation microchannel is arranged on a side of the second cover plate close to the condensation section branch structure, the second cover plate is connected to a side of the condensation section branch structure away from the first cover plate, and the second cover plate and the condensation section branch structure form a second condensation passage.

[0012] Furthermore, the heat flow channel is communicated with the pulsating heat pipe microchannel.

[0013] Furthermore, the first condensation passage and the second condensation passage are both perpendicular to the direction of the pulsating heat pipe microchannel, and the cross-sectional shape of the first condensation microchannel and the second condensation microchannel is one of a rectangle, a triangle, a trapezoid or a circle.

[0014] Furthermore, the material of the plate-type pulsating heat pipe and the condensing section branch structure is selected from one or a combination of copper and aluminum.

[0015] Furthermore, it also includes a water inlet manifold and a water outlet manifold, and the water inlet manifold and the water outlet manifold are respectively arranged on both sides of the second cover plate, the water inlet manifold is provided with a water inlet hole, and the water outlet tank is provided with a water collecting hole, the water inlet hole is connected to the first condensation passage and the second condensation passage, and the water collecting hole is connected to one end of the first condensation passage and the second condensation passage away from the water inlet hole.

[0016] Furthermore, through holes are provided on the outside of the water inlet header and the water outlet header, pipelines are installed in the through holes, and the pipelines corresponding to the water inlet header and the pipelines corresponding to the water outlet header are connected to a cooling fluid circulation water circuit.

[0017] Furthermore, the plate-type pulsating heat pipe microchannel and the heat flow channel are both provided in plurality, the widths of adjacent plate-type pulsating heat pipe microchannels are 1 mm and 2 mm respectively, and the widths of adjacent branch microchannels are 1 mm and 2 mm respectively.

[0018] Furthermore, a liquid filling hole is provided on one side of the plate-type pulsating heat pipe, and the liquid filling hole is connected to a vacuuming and liquid filling device to fill liquid into the microchannel of the plate-type pulsating heat pipe.

[0019] Furthermore, the working fluid filled in the microchannel of the plate-type pulsating heat pipe is one of ultrapure water, anhydrous ethanol and nanofluid, and the filling rate is 30%-70%.

[0020] The beneficial effects of the present invention are:

[0021] The plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end described in the present invention combines the plate-type pulsating heat pipe and the plate-type heat exchanger in combination with the characteristic that the chip packaging surface is flat, so that it can not only fit closely with the electronic chip but also give full play to the characteristics of the plate-type heat exchanger, such as large heat exchange area, small thermal resistance, and strong heat exchange capacity. The condensing end of the plate-type pulsating heat pipe is divided into a three-way parallel structure, which effectively improves its heat exchange capacity, solves the problem of insufficient condensation capacity of the traditional plate-type pulsating heat pipe radiator, and solves the problem of insufficient reflux of the liquid working medium from the condensing end to the evaporating end, effectively improves the performance of the plate-type pulsating heat pipe radiator at high power, and broadens the application range of the plate-type pulsating heat pipe radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An exploded view of a plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end of the present invention.

[0023] Figure 2 This is an axonometric view of a plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end of the present invention.

[0024] Figure 3 This is a front view of a plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end of the present invention.

[0025] Figure 4 This is a schematic diagram of a first cover plate of a plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end of the present invention.

[0026] Figure 5 The present invention is a schematic diagram of the distribution of vapor plugs and liquid plugs in a plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end.

[0027] Among them, in the figure:

[0028] 1-plate type pulsating heat pipe; 2-condensation section branch structure; 3-first cover plate; 4-second cover plate; 5-water inlet header; 6-liquid filling hole. DETAILED DESCRIPTION

[0029] The following will be combined with the attached embodiment of the present invention Figure 1-5 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0030] Embodiment 1

[0031] Combination Figure 1-5 The present embodiment provides a plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end, comprising a plate-type pulsating heat pipe 1, a condensing section branch structure 2, a first cover plate 3 and a second cover plate 4, wherein the plate-type pulsating heat pipe 1 comprises a substrate and a pulsating heat pipe microchannel, wherein the pulsating heat pipe microchannel is arranged on the substrate, a boss is arranged at the bottom end of the condensing section branch structure 2, and the boss is connected to the outside of the plate-type pulsating heat pipe 1, a branch microchannel is arranged on the side of the condensing section branch structure 2 close to the plate-type pulsating heat pipe 1, a first condensation microchannel is arranged on the side of the first cover plate 3 close to the plate-type pulsating heat pipe 1, the first cover plate 3 is connected between the plate-type pulsating heat pipe 1 and the condensing section branch structure 2, and is located at the top of the boss, a first condensation passage is formed between the first cover plate 3 and the plate-type pulsating heat pipe 1, and the first cover A heat flow channel is formed between the plate 3 and the condensation section branch structure 2, and a second condensation microchannel is arranged on the side of the second cover plate 4 close to the condensation section branch structure 2, and the second cover plate 4 is connected to the side of the condensation section branch structure 2 away from the first cover plate 3, and the second cover plate 4 and the condensation section branch structure 2 form a second condensation passage; due to the characteristics of the first condensation microchannel and the second condensation microchannel themselves with relatively large flow channel surface area and volume, the contact area between the small volume liquid and the first condensation microchannel and the second condensation microchannel is very large, and more heat will be taken away by the cooling fluid in the same time, thereby improving the heat exchange efficiency, and the increase of the reflux working fluid in the plate-type pulsating heat pipe can avoid the situation where the evaporation end is dried out for a considerable period of time, especially when the high-power chip generates a large amount of heat, and the normal operation of the plate-type pulsating heat pipe can also be guaranteed.

[0032] The heat flow channel is connected with the pulsating heat pipe microchannel, which improves the heat dissipation efficiency of the radiator and evenly cools the high-temperature working medium inside the radiator.

[0033] Furthermore, the first condensation passage and the second condensation passage are both perpendicular to the direction of the pulsating heat pipe microchannel, and the cross-sectional shape of the first condensation microchannel and the second condensation microchannel is one of a rectangle, a triangle, a trapezoid or a circle; the first condensation passage and the second condensation passage arranged perpendicular to the pulsating heat pipe microchannel can improve the heat exchange efficiency of the working fluid in the pulsating heat pipe microchannel.

[0034] The plate-type pulsating heat pipe microchannel and the heat flow channel are both provided in plurality, the widths of adjacent plate-type pulsating heat pipe microchannels are 1 mm and 2 mm respectively, and the widths of adjacent branch microchannels are 1 mm and 2 mm respectively; Figure 5As shown, through the above-mentioned width limitation, the unbalanced pressure difference of the working fluid between adjacent pulsating heat pipe microchannels is increased, and the pulsating force of the steam plug and the liquid plug is increased. Due to the combined effect of the surface tension and gravity of the working fluid in the pulsating heat pipe microchannel, the force conditions of the steam plug and the liquid plug in the channel with a large equivalent diameter and the channel with a small equivalent diameter are different, forming a pressure difference between the steam plug and the liquid plug between adjacent channels, which helps to make them move upward or downward. When this unbalanced pressure difference is large enough, the pulsation amplitude of the steam plug and the liquid plug will increase, and even cross the elbow into the adjacent channel, forming a large-amplitude pulsation with a relatively large amplitude, which greatly enhances the sensible heat exchange and latent heat exchange. Compared with the traditional pulsating heat pipe using the same equivalent diameter channel, the heat exchange thermal resistance is greatly reduced and the heat exchange capacity is enhanced.

[0035] The material of the plate-type pulsating heat pipe 1 and the condensing section branch structure 2 is selected from one or a combination of copper and aluminum. In this embodiment, the plate-type pulsating heat pipe and the condensing section branch structure are both made of aluminum.

[0036] Furthermore, the plate-type pulsating heat pipe radiator of the condensing end integrated plate heat exchanger also includes a water inlet header 5 and a water outlet header, the water inlet header 5 and the water outlet header are respectively arranged on both sides of the second cover plate 4, the water inlet header 5 is provided with a water inlet hole, the water outlet tank is provided with a water collecting hole, the water inlet hole is connected with the first condensation passage and the second condensation passage, and the water collecting hole is connected with one end of the first condensation passage and the second condensation passage away from the water inlet hole; the outer sides of the water inlet header 5 and the water outlet header are both provided with through holes, and the through holes are both installed with pipelines, and the pipelines corresponding to the water inlet header 5 and the pipelines corresponding to the water outlet header are connected with a circulating cooling water circuit; when cooling work is performed, the circulating cooling water circuit inputs the cooling medium into the water inlet header, and the cooling medium flows through the first condensation microchannel and the second condensation microchannel to realize heat dissipation of the plate-type pulsating heat pipe and the condensation section branch structure 2, and the cooling medium after absorbing heat is gathered in the water outlet header and flows back to the circulating cooling water circuit.

[0037] like Figure 3 As shown, the plate-type pulsating heat pipe 1 comprises a condensing end, an insulating end and a heating end from top to bottom. In actual use, the plate-type pulsating heat pipe is responsible for transferring heat from its heating end to the insulating end and the condensing end in sequence. The fluid flow directions in the first condensation microchannel and the second condensation microchannel respectively arranged on the first cover plate 3 and the second cover plate 4 are perpendicular to the pulsation direction of the working medium in the plate-type pulsating heat pipe, and the cooling working medium is responsible for taking away the heat from the plate-type pulsating heat pipe and the heat flow channel.

[0038] As an optimization, a filling hole 6 is provided on one side of the plate-type pulsating heat pipe 1, and the filling hole 6 is connected to a vacuum liquid injection device to fill the plate-type pulsating heat pipe microchannel with liquid. The working fluid filled in the plate-type pulsating heat pipe microchannel is one of ultrapure water, anhydrous ethanol and nanofluid, and the filling rate is 30%-70%. In this embodiment, the filling working fluid is ultrapure water, and the filling rate is 40%.

[0039] Furthermore, in this embodiment, the plate-type pulsating heat pipe 1 and the first cover plate 3, the first cover plate 3 and the condensation section branch structure 2, and the condensation section branch structure 2 and the second cover plate 4 are all sealed by diffusion welding to ensure good sealing performance and no leakage between adjacent channels.

[0040] The heat flow channel in the structure of the present invention and the pulsating heat pipe microchannel form a plate-type pulsating heat pipe structure, and the first condensation passage and the second condensation passage form a plate-type heat exchanger structure. The plate-type pulsating heat pipe structure and the plate-type heat exchanger structure are both operated independently, so the fluid flow pressure, flow velocity, fluid type, and even the source and destination of the fluid in the plate-type heat exchanger structure can be determined according to actual conditions, avoiding the disadvantage that the fluid in the traditional plate-type pulsating heat pipe cannot be changed once it is filled, and broadening the application prospects of the present invention in different occasions.

[0041] Without changing the structure of the plate-type pulsating heat pipe itself, the present invention not only maintains the excellent characteristics of the pulsating heat pipe itself, but also integrates the advantages of the plate-type heat exchanger structure by processing the condensation microchannel on the condensation end cover plate, so that each part can operate independently, improves the disadvantage of increased flow resistance caused by the change of the structure of the plate-type pulsating heat pipe itself, and gives full play to the inherent advantages of the two structures.

[0042] The present invention discloses a plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end, which combines the characteristics of a flat chip packaging surface, and combines the plate-type pulsating heat pipe and the plate-type heat exchanger, so that it can not only fit closely with the electronic chip but also give full play to the characteristics of the plate-type heat exchanger, such as large heat exchange area, small thermal resistance, and strong heat exchange capacity. The condensing end of the plate-type pulsating heat pipe is divided into a three-way parallel structure, which effectively improves its heat exchange capacity, solves the problem of insufficient condensation capacity of the traditional plate-type pulsating heat pipe radiator, and solves the problem of insufficient reflux of the liquid working medium from the condensing end to the evaporating end, effectively improves the performance of the plate-type pulsating heat pipe radiator at high power, and broadens the application range of the plate-type pulsating heat pipe radiator.

[0043] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plate-type pulsating heat pipe radiator with an integrated plate heat exchanger at the condensing end, characterized in that: include: A plate-type pulsating heat pipe, the plate-type pulsating heat pipe comprising a substrate and a pulsating heat pipe microchannel, the pulsating heat pipe microchannel being arranged on the substrate; A condensation section branch structure, wherein a boss is provided at the bottom end of the condensation section branch structure, the boss is connected to the outside of the plate-type pulsating heat pipe, and a branch microchannel is provided on one side of the condensation section branch structure close to the plate-type pulsating heat pipe; A first cover plate, wherein a first condensation microchannel is disposed on one side of the first cover plate close to the plate-type pulsating heat pipe, the first cover plate is connected between the plate-type pulsating heat pipe and the condensation section branch structure, and is located at the top of the boss, a first condensation passage is formed between the first cover plate and the plate-type pulsating heat pipe, and a heat flow channel is formed between the first cover plate and the condensation section branch structure; A second cover plate, wherein a second condensation microchannel is provided on a side of the second cover plate close to the condensation section branch structure, the second cover plate is connected to a side of the condensation section branch structure away from the first cover plate, and the second cover plate and the condensation section branch structure form a second condensation passage; The first condensation passage and the second condensation passage are both perpendicular to the direction of the pulsating heat pipe microchannel, and the cross-sectional shape of the first condensation microchannel and the second condensation microchannel is one of a rectangle, a triangle, a trapezoid or a circle; The plate-type pulsating heat pipe and the condensing section branch structure are made of one or a combination of copper and aluminum.

2. The plate-type pulsating heat pipe radiator with integrated plate heat exchanger at the condensing end according to claim 1, characterized in that: The heat flow channel is communicated with the pulsating heat pipe microchannel.

3. The plate-type pulsating heat pipe radiator with integrated plate heat exchanger at the condensing end according to claim 1, characterized in that: It also includes a water inlet manifold and a water outlet manifold, which are respectively arranged on both sides of the second cover plate, the water inlet manifold is provided with a water inlet hole, and the water outlet tank is provided with a water collecting hole, the water inlet hole is connected to the first condensation passage and the second condensation passage, and the water collecting hole is connected to one end of the first condensation passage and the second condensation passage away from the water inlet hole.

4. The plate-type pulsating heat pipe radiator with integrated plate heat exchanger at the condensing end according to claim 3, characterized in that: Through holes are arranged on the outside of the water inlet header and the water outlet header, and pipelines are installed in the through holes. The pipelines corresponding to the water inlet header and the pipelines corresponding to the water outlet header are connected to the cooling fluid circulation water circuit.

5. The plate-type pulsating heat pipe radiator with integrated plate heat exchanger at the condensing end according to claim 1, characterized in that: The pulsating heat pipe microchannel and the branch microchannel are both provided in plurality, the widths of adjacent pulsating heat pipe microchannels are 1 mm and 2 mm respectively, and the widths of adjacent branch microchannels are 1 mm and 2 mm respectively.

6. The plate-type pulsating heat pipe radiator with integrated plate heat exchanger at the condensing end according to claim 1, characterized in that: A liquid filling hole is arranged on one side of the plate-type pulsating heat pipe, and the liquid filling hole is connected to a vacuuming and liquid filling device to fill liquid into the microchannel of the pulsating heat pipe.

7. The plate-type pulsating heat pipe radiator with integrated plate heat exchanger at the condensing end according to claim 6, characterized in that: The working fluid filled in the microchannel of the pulsating heat pipe is one of ultrapure water, anhydrous ethanol and nanofluid, and the filling rate is 30%-70%.

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