CN212286544U - Double-channel unidirectional heat transfer heat pipe - Google Patents

Abstract

The utility model discloses a binary channels one-way heat transfer heat pipe, it includes: the box-type metal sheet is provided with a groove, and first microstructures are processed on two sides of the bottom surface of the groove; the cover type metal sheet is provided with a boss matched with the groove, a preset gap is reserved between the bottom surface of the groove and the boss, and second microstructures are processed on two sides of the surface of the boss. This binary channels one-way heat transfer heat pipe, inside both ends are evaporation zone and condensation segment respectively, the micro-structure of predetermined clearance both sides can adsorb liquid and make liquid take place one-way flow, for the liquid way, the middle unprocessed micro-structure in predetermined clearance, be equivalent to the air flue, working liquid is between evaporation zone and condensation segment, through liquid way and air flue circulation flow, realize thermal transmission, when the trouble condition takes place, because one-way flow's characteristic, the heat pipe can only one-way heat transfer, thereby play the effect of the electronic component of protection evaporation zone, this utility model is used for heat pipe technical field.

Description

Double-channel unidirectional heat transfer heat pipe

Technical Field

The utility model relates to a heat pipe technical field especially relates to a binary channels one-way heat transfer heat pipe.

Background

With the development of technology, various high-power electronic products have increased, and the demand for heat dissipation elements of the high-power electronic products has increased. Heat pipes are widely used for heat dissipation of electronic devices as efficient heat transfer elements. However, as the working environment of electronic devices becomes complicated, the conventional heat pipes are gradually unable to meet special requirements. The conventional heat pipe has bi-directional property, i.e. heat transfer in two directions can be realized, and the heat transfer direction is determined by the high temperature at two ends, i.e. the heat is transferred from the high temperature section to the low temperature section. Under normal working conditions, the heating element such as a chip is positioned at the high-temperature section, the radiating element is positioned at the low-temperature section, and the heat pipe transmits the temperature of the heating element to the radiating section and releases the heat. However, in the event of a failure of the electronic device, the temperature of the heat dissipation element may be higher than that of the chip, which may transmit the external temperature to the chip, and may cause damage to important and expensive components such as the chip, which may cause a great loss.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a binary channels one-way heat transfer heat pipe, can realize one-way heat transfer, play the effect of protection important electronic component.

According to the utility model discloses an embodiment provides a binary channels one-way heat transfer heat pipe, include:

the box-type metal sheet is provided with a groove, first microstructures extending along the length direction are processed on two sides of the bottom surface of the groove, and the first microstructures on the two sides are arranged at intervals; and

the cover-type metal sheet is embedded with the box-type metal sheet, a boss matched with the groove is arranged on the cover-type metal sheet, a preset gap is reserved between the bottom surface of the groove and the boss, second microstructures opposite to the first microstructures are processed on two sides of the surface of the boss, and the direction of the first microstructures is the same as that of the second microstructures.

Has the advantages that: the double-channel unidirectional heat transfer heat pipe is characterized in that a cover-type metal sheet and a box-type metal sheet are embedded and positioned, working liquid is filled in a preset gap between a groove and a boss, an evaporation section and a condensation section are respectively arranged at two ends in the heat pipe, microstructures at two sides of the preset gap can absorb the liquid and enable the liquid to flow in a unidirectional mode, the microstructures are equivalent to liquid absorption cores and liquid channels, microstructures are not processed in the middle of the preset gap and are equivalent to air channels, the working liquid flows between the evaporation section and the condensation section through the liquid channels and the air channels in a circulating mode to achieve heat transfer, when the temperature of the condensation section is higher than that of the evaporation section due to a fault condition, the working liquid cannot form reverse circulation due to the characteristic of unidirectional flow, the heat pipe can only conduct heat in a unidirectional mode, the function of protecting electronic elements of the evaporation section is achieved, two channels are formed on two sides in the heat pipe, and the, the flow efficiency of the working liquid can be improved, thereby improving the heat transfer efficiency.

According to the embodiment of the utility model provides a binary channels one-way heat transfer heat pipe, the bottom surface of recess with hydrophilic processing is done on the surface of boss, can improve the micro-structure of both sides to the adsorption efficiency of liquid, make working fluid attach to more easily on the micro-structure of both sides.

According to the embodiment of the utility model provides a binary channels one-way heat transfer heat pipe, first microstructure includes a plurality of protruding grain groups, protruding grain group follows the length direction and the width direction align to grid of box type sheetmetal, protruding grain group includes first protruding grain and the protruding grain of second, first protruding grain and the protruding grain interval of second are the V style of calligraphy. The convex particle groups are V-shaped and have directionality, and unidirectional flow characteristics of liquid on the surface are realized through uniform arrangement of the convex particle groups.

According to the utility model discloses binary channels one-way heat transfer heat pipe, the one end of box-shaped sheetmetal is equipped with the connection predetermined clearance and external through hole, the through hole is connected with the liquid charging pipe. The working liquid is injected into the hot pipe through the liquid filling pipe, and the liquid is more easily evaporated into steam through the vacuum pumping treatment of the liquid filling pipe.

According to the utility model discloses binary channels one-way heat transfer heat pipe, the through hole include the tube hole and annotate the liquid hole, the tube hole is connected the liquid charging pipe, the both ends of annotating the liquid hole are connected respectively the predetermined clearance with the tube hole, the diameter of annotating the liquid hole is less than the diameter of tube hole. The diameter of the pipe hole is large, the pipe hole is used for installing a liquid filling pipe, and the diameter of the liquid filling hole is small and used for communicating the inside of a preset gap with a small distance.

According to the utility model discloses binary channels one-way heat transfer heat pipe, the one end of box-shaped sheetmetal is equipped with the arch, the tube hole with annotate the liquid hole and locate the bellying. The wall thickness of this position can be increased to the arch, convenient processing.

According to the utility model discloses binary channels one-way heat transfer heat pipe, box type sheetmetal with through high temperature resistant glue sealing connection between the lid type sheetmetal to guarantee inside leakproofness.

According to the utility model discloses binary channels one-way heat transfer heat pipe, box type sheetmetal with the material of lid type sheetmetal is copper, and copper has good heat conductivility.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural view illustrating the disassembly of the box-type metal sheet and the cover-type metal sheet according to the embodiment of the present invention;

fig. 3 is a partial enlarged view of a first microstructure according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a cover-type metal sheet according to an embodiment of the present invention;

FIG. 5 is a top view of a box-shaped metal sheet according to an embodiment of the present invention;

fig. 6 is a schematic sectional view in the width direction of the embodiment of the present invention;

fig. 7 is a sectional schematic view of the embodiment of the present invention in the length direction;

reference numerals: the liquid filling structure comprises a box-shaped metal sheet 10, a groove 11, a first microstructure 12, a convex particle group 121, a first convex particle 122, a second convex particle 123, a pipe hole 13, a liquid filling hole 14, a protrusion 15, a cover-shaped metal sheet 20, a boss 21, a second microstructure 22, a liquid filling pipe 30, a liquid channel 40 and an air channel 50.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1, an embodiment of the present invention provides a two-channel one-way heat transfer heat pipe, where two external ends are respectively a heating end and a heat dissipation end, and the heating end is generally used for placing heating components, such as chips; the heat dissipation end is generally provided with a heat dissipation device such as an electric fan. The double-channel unidirectional heat transfer heat pipe of the embodiment can realize unidirectional heat transfer, heat at the heating end is transferred to the heat dissipation end along the heat pipe, and the heat transfer efficiency is very low or the heat transfer cannot be realized at all in the opposite direction.

Referring to fig. 2 to 5, the two-channel one-way heat transfer heat pipe of the present embodiment includes a box-shaped metal sheet 10 and a cover-shaped metal sheet 20, wherein a groove 11 is formed on the box-shaped metal sheet 10, first microstructures 12 extending along a length direction are processed on two sides of a bottom surface of the groove 11, and the first microstructures 12 on the two sides are arranged at intervals, that is, in a width direction of the groove 11, the microstructures are processed in an arrangement form of processing-non-processing; the cover-type metal sheet 20 is embedded with the box-type metal sheet 10, a boss 21 matched with the groove 11 is arranged on the cover-type metal sheet 20, a preset gap is formed between the bottom surface of the groove 11 and the boss 21, similarly, second microstructures 22 are processed on two sides of the surface of the boss 21, the second microstructures 22 are opposite to the first microstructures 12, the direction of the second microstructures 22 is the same as that of the first microstructures 12, and in the embodiment, the first microstructures 12 are the same as those of the second microstructures 22.

The box-type metal sheet 10 and the cover-type metal sheet 20 are made of copper or other metal with good thermal conductivity so as to be beneficial to heat transfer, and the two metal sheets are embedded to form the heat pipe in a manner similar to a box and a cover, so that the assembly is convenient and the processing is convenient. The box-type metal sheet 10 and the cover-type metal sheet 20 are hermetically connected through high-temperature-resistant glue to ensure the internal sealing performance, and after connection, a preset gap is formed between the bottom surface of the groove 11 in the box-type metal sheet 10 and the boss 21 in the cover-type metal sheet 20 and is not completely attached.

The microstructures have directionality, so that liquid can be attached to the microstructures and flows in a single direction, the liquid flow resistance in the opposite direction is large or the liquid cannot flow, the function of the microstructures is equivalent to a capillary wick, and the liquid at the position of a middle unprocessed microstructure in a preset gap can be adsorbed to the microstructures on two sides. The height t of the predetermined gap inside the heat pipe can reach 1mm, and referring to fig. 6, the smaller the distance of the predetermined gap, the better the effect of the unidirectional flow of the liquid.

It has been found that the liquid does not flow straight across the relatively wide microstructure surface, but rather is substantially S-shaped, and when the width of the microstructure is relatively narrow, the flow of the liquid across the surface approaches a straight line and the time to reach the other end is reduced. In this embodiment, the first microstructures are processed on the two sides of the bottom surface of the groove 11, and the first microstructures on the two sides are arranged at intervals, so that the distance of the first microstructures in the width direction is reduced, and the liquid can be constrained to flow linearly on the surface, so that the flowing speed of the liquid is increased, and the heat transfer efficiency is improved.

In this embodiment, the bottom surface of the groove 11 and the surface of the boss 21 are subjected to hydrophilic treatment, so as to improve the liquid adsorption capability of the microstructures on both sides, and make the liquid more easily adhere to the microstructures on both sides.

In this embodiment, one end of the box-type metal sheet 10 is provided with a through hole for connecting a predetermined gap with the outside, the through hole is connected with a liquid charging tube 30, the liquid charging tube 30 can be a copper tube, working liquid is injected into the heat tube through the liquid charging tube 30, and a vacuumizing device is used for connecting the liquid charging tube 30, so that the inside of the heat tube can be vacuumized, the pressure inside the heat tube can be reduced, the boiling point of the working liquid is reduced, the liquid is evaporated more easily to form steam, and the heat tube can normally work under the condition of lower temperature. After the liquid injection and the vacuum pumping are completed, the inlet of the liquid filling pipe 30 is sealed, so that the interior of the heat pipe is in a sealed state.

Referring to fig. 5, specifically, the through-hole includes a tube hole 13 and a liquid injection hole 14, wherein the tube hole 13 is connected to the liquid filling tube 30, both ends of the liquid injection hole 14 are connected to the predetermined gap and the tube hole 13, respectively, and the diameter of the liquid injection hole 14 is smaller than that of the tube hole 13. The pipe hole 13 has a larger diameter for installing the liquid charging pipe 30, and the liquid charging hole 14 has a smaller diameter for communicating with the inside of the predetermined gap having a smaller distance. One end of the box-shaped metal sheet 10 is provided with a bulge 15, the pipe hole 13 and the liquid injection hole 14 are arranged at the bulge 15, the bulge 15 can increase the wall thickness of the position, and the pipe hole 13 and the liquid injection hole 14 can be conveniently processed.

Referring to fig. 3, in some embodiments, the first microstructure 12 includes a plurality of bump groups 121, the bump groups 121 are uniformly arranged along the length direction and the width direction of the box-type metal sheet 10, the bump groups 121 include first bumps 122 and second bumps 123, the first bumps 122 and the second bumps 123 are spaced apart in a V-shape, and the second microstructure 22 has the same structure as the first microstructure 12. The convex particle groups 121 are V-shaped and have directivity, and the unidirectional flow characteristic of the liquid on the surface is realized by the uniform arrangement of the convex particle groups 121, and the wide-mouth direction and the narrow-mouth direction of the V-shape determine the flow direction of the liquid.

It is to be understood that the first and second microstructures 12 and 22 are not limited to the above-described structure as long as unidirectional flow of liquid can be achieved.

Referring to fig. 6 and 7, the working principle of the dual-channel unidirectional heat transfer heat pipe of the present embodiment is as follows:

the two ends in the heat pipe are respectively an evaporation section and a condensation section, which respectively correspond to an external heating end and a heat dissipation end, working liquid is filled in the heat pipe, the working liquid can directly adopt water, a preset gap in the heat pipe is a closed space formed between the groove 11 of the box-shaped metal sheet 10 and the boss 21 of the cover-shaped metal sheet 20, microstructures are processed on the bottom surface of the groove 11 and the two sides of the surface of the boss 21, and hydrophilic treatment is carried out to ensure that the working liquid is attached to the microstructures and flows in a single direction, which is equivalent to a liquid absorption core and is a liquid channel 40, the microstructures are not processed in the middle part of the preset gap and are the air channel 50, vapor formed by evaporation of the working liquid flows in the air channel 50, the microstructures on the two sides can absorb the working liquid on the air channel 50 to the liquid channel 40 to ensure the smoothness of the air channel 50, and because of two liquid channels 40, namely two channels, the liquid transmission efficiency is higher, the liquid phase change effect is better, and the heat transfer efficiency is higher.

The right end of the heat pipe is an evaporation section and contacts with an external heating element, and the left end of the heat pipe is a condensation section and contacts with a heat dissipation element.

Under normal conditions, the temperature of the evaporation section is higher than that of the condensation section, when the working liquid is in the evaporation section, the working liquid absorbs heat and changes phase to form steam due to the higher temperature, and the steam flows to the condensation section through the middle air passage 50; because the condensation section is in contact with the heat dissipation element, the temperature is low, the heat release phase change of the steam is enabled to form liquid, the liquid is adsorbed by the microstructures on the two sides and flows in a single phase, the liquid flows to the evaporation section along the liquid channel 40 and then forms the steam through the heat absorption phase change, the circulation is repeated, the heat absorption and heat release processes are generated in the phase change process, the heat transfer is finally realized, and the temperature of the heating element is reduced.

When the electronic device is in failure, such as the heat dissipation device is on fire, and other special conditions, the temperature of the heat dissipation end is higher than that of the heating end, namely the temperature of the condensation section in the hot pipe is higher than that of the evaporation section, at the moment, the liquid in the condensation section absorbs heat due to higher temperature and changes phase to form steam, the steam passes through the evaporation section of the air channel 50, the temperature of the evaporation section is lower, the heat release phase of the steam is changed to form liquid, the liquid is absorbed by the microstructure, but the liquid cannot flow to the condensation section due to the characteristic of unidirectional flow of the microstructure, circulation cannot be formed, the heat transfer efficiency is reduced or heat transfer cannot be completely performed, and finally the function of protecting important elements of the evaporation section is achieved.

The double-channel one-way heat transfer heat pipe is small in thickness, compact in structure, small in occupied space, convenient to assemble and suitable for being used in small-size electric devices.

The utility model discloses processing of binary channels one-way heat transfer heat pipe adopts following step:

s1, preliminarily cutting the shapes of a box-shaped metal sheet 10 and a cover-shaped metal sheet 20 by using a laser cutting device, wherein the shapes are approximately rectangular, and one end of the box-shaped metal sheet is provided with a bulge 15;

s2, processing a groove 11 on one surface of the box-shaped metal sheet 10, and drilling a liquid injection hole 14 and a pipe hole 13 at one end of the box-shaped metal sheet 10;

s3, processing a boss 21 matched with the groove 11 on the cover type metal sheet 20;

s4, processing first microstructures 12 on two sides of the bottom surface of the groove 11 through a laser engraving machine, and processing second microstructures 22 identical to the first microstructures 12 on the surface of the boss 21;

s5, performing hydrophilic treatment on the bottom surface of the groove 11 and the surface of the boss 21;

s6, assembling the box-shaped metal sheet 10 and the cover-shaped metal sheet 20, wherein the boss 21 is matched with the groove 11, the box-shaped metal sheet 10 and the cover-shaped metal sheet 20 are connected in a sealing manner through high-temperature-resistant glue, and a liquid charging pipe 30 is inserted into the position of the pipe hole 13;

s7, injecting working liquid through the liquid filling pipe 30, and performing vacuum pumping treatment through the liquid filling pipe 30;

s8, stamping the liquid charging pipe 30 to deform the liquid charging pipe 30, and then welding and sealing the pipe opening to form a sealed shape inside the heat pipe;

s9, carrying out a one-way heat transfer test on the heat pipe to ensure normal use.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (8)

1. A two-channel unidirectional heat transfer heat pipe is characterized by comprising:

the box-type metal sheet is provided with a groove, first microstructures extending along the length direction are processed on two sides of the bottom surface of the groove, and the first microstructures on the two sides are arranged at intervals; and

the cover-type metal sheet is embedded with the box-type metal sheet, a boss matched with the groove is arranged on the cover-type metal sheet, a preset gap is reserved between the bottom surface of the groove and the boss, second microstructures opposite to the first microstructures are processed on two sides of the surface of the boss, and the direction of the first microstructures is the same as that of the second microstructures.

2. The dual channel unidirectional heat transfer heat pipe of claim 1, wherein: and the bottom surface of the groove and the surface of the boss are subjected to hydrophilic treatment.

3. The dual channel unidirectional heat transfer heat pipe of claim 1, wherein: the first microstructure comprises a plurality of convex particle groups, the convex particle groups are uniformly arranged along the length direction and the width direction of the box-shaped metal sheet, each convex particle group comprises a first convex particle and a second convex particle, and the first convex particles and the second convex particles are in a V shape at intervals.

4. The dual-channel unidirectional heat transfer heat pipe according to any one of claims 1 to 3, wherein: one end of the box-shaped metal sheet is provided with a through hole for connecting the preset gap with the outside, and the through hole is connected with a liquid filling pipe.

5. The dual channel unidirectional heat transfer heat pipe of claim 4, wherein: the through hole comprises a pipe hole and a liquid injection hole, the pipe hole is connected with the liquid filling pipe, two ends of the liquid injection hole are respectively connected with the preset gap and the pipe hole, and the diameter of the liquid injection hole is smaller than that of the pipe hole.

6. The dual channel unidirectional heat transfer heat pipe of claim 5, wherein: one end of the box-shaped metal sheet is provided with a bulge, and the pipe hole and the liquid injection hole are arranged at the bulge.

7. The dual channel unidirectional heat transfer heat pipe of claim 1, wherein: the box-type metal sheet and the cover-type metal sheet are hermetically connected through high-temperature-resistant glue.

8. The dual channel unidirectional heat transfer heat pipe of claim 1, wherein: the box-shaped metal sheet and the cover-shaped metal sheet are made of copper.

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