CN111590281A - Flat one-way heat transfer heat pipe and processing method thereof - Google Patents

Abstract

The invention discloses a flat one-way heat transfer heat pipe and a processing method thereof. The flat one-way heat transfer heat pipe comprises a first metal sheet, a second metal sheet and a holder, the first metal sheet and the second metal sheet are arranged oppositely, and the first metal sheet and the second metal sheet are oppositely arranged. There is a predetermined gap between a metal sheet and the second metal sheet, the opposite inner surfaces of the first metal sheet and the second metal sheet have microstructures and are treated with hydrophilicity, and a hollow layer is formed between the predetermined gap and the cage. This flat one-way heat transfer heat pipe is filled with working liquid. The upper and lower layers inside the heat pipe are surfaces with microstructures, and after hydrophilic treatment, the liquid can flow in one direction. When the temperature is higher than that of the evaporation section, due to the characteristics of one-way flow, the working liquid cannot form a reverse circulation, and the heat pipe can only transfer heat in one direction, so as to protect the electronic components of the evaporation section. This invention is used in the technical field of heat pipes .

Description

A kind of flat one-way heat transfer heat pipe and its processing method

technical field

The invention relates to the technical field of heat pipes, in particular to a flat unidirectional heat transfer heat pipe and a processing method thereof.

Background technique

With the development of science and technology, various high-power electronic products have increased, and the demand for components used for heat dissipation of high-power electronic products has gradually increased. As an efficient heat transfer element, heat pipes are widely used in the heat dissipation of electronic devices. However, with the complexity of the working environment of electronic devices, the commonly used heat pipes are gradually unable to meet the special requirements. The traditional heat pipe has bidirectionality, that is, it can realize heat transfer in two directions. Under normal working conditions, the heating elements such as chips are in the high temperature section, the heat dissipation elements are in the low temperature section, and the heat pipe transmits the temperature of the heating elements to the heat dissipation section and releases the heat. However, when the electronic device fails, the temperature of the heat dissipation element will be higher than the temperature of the chip, which will transmit the external temperature to the chip, which will cause damage to important and expensive components such as chips, which will cause huge damage. loss.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a flat unidirectional heat transfer tube and a processing method thereof, which can realize unidirectional heat transfer and protect important electronic components.

According to an embodiment of the first aspect of the present invention, a flat unidirectional heat transfer heat pipe is provided, comprising:

a first metal sheet and a second metal sheet, the first metal sheet and the second metal sheet are arranged opposite to each other, there is a predetermined gap between the first metal sheet and the second metal sheet, the first metal sheet and the second metal sheet The opposite inner surfaces of the metal sheets have a uniformly oriented microstructure and are hydrophilically treated; and

A retainer, the retainer is annular, is arranged between the first metal sheet and the second metal sheet, and a hollow layer is formed between the predetermined gap and the inner wall surface of the retainer.

Beneficial effect: The flat one-way heat transfer heat pipe has an evaporation section and a condensation section at both ends, and the interior is filled with working liquid. One-way flow occurs, which is equivalent to a liquid wick and is a liquid channel. The hollow layer between the first metal sheet and the second metal sheet is equivalent to an air channel. The working liquid is between the evaporation section and the condensation section, passing through the liquid channel and the air channel. Circulating flow to achieve heat transfer. When a fault occurs, the temperature of the condensation section is higher than the temperature of the evaporation section, due to the characteristics of one-way flow, the working liquid cannot form a reverse circulation, and the heat pipe can only transfer heat in one direction, thus starting To protect the electronic components of the evaporation section.

According to the flat one-way heat transfer tube according to the embodiment of the first aspect of the present invention, a boss is provided on the opposite inner surface of the first metal sheet and the second metal sheet, and the boss is fitted with the holder , the microstructure is processed on the boss and hydrophilic treatment is performed. The positioning of the first metal sheet and the second metal sheet is realized by the fitting of the boss and the hollow part of the cage, which can improve the sealing performance and reduce the distance between the first metal sheet and the second metal sheet. When the gap is smaller, the unidirectional flow of the liquid is better, and the liquid is easier to adhere to the microstructure.

According to the flat unidirectional heat transfer tube according to the embodiment of the first aspect of the present invention, the microstructure includes a plurality of bump groups, and the bump groups are along the length direction and width of the first metal sheet or the second metal sheet The directions are evenly arranged, the bump group includes a first bump and a second bump, and the interval between the first bump and the second bump is V-shaped. The convex group is V-shaped and has directionality, and the unidirectional flow characteristic of the liquid on the surface is realized by the uniform arrangement of the convex group.

According to the flat one-way heat transfer tube according to the embodiment of the first aspect of the present invention, the first metal sheet and the cage and between the second metal sheet and the cage are sealed and connected by high temperature resistant glue, so as to Guaranteed internal tightness.

According to the flat one-way heat transfer tube according to the embodiment of the first aspect of the present invention, one side of the holder is provided with a through hole connecting the hollow layer and the outside, and the through hole is connected with a liquid filling pipe. The working liquid is injected into the inside of the heat pipe through the liquid filling pipe, and the vacuum is processed through the liquid filling pipe, so that the liquid is more easily evaporated into steam.

According to the flat one-way heat transfer tube according to the embodiment of the first aspect of the present invention, the through hole includes a tube hole and a liquid injection hole, the pipe hole is connected to the liquid filling pipe, and the two ends of the liquid injection hole are respectively The hollow layer and the pipe hole are connected, and the diameter of the liquid injection hole is smaller than the diameter of the pipe hole. The diameter of the pipe hole is large, which is used to install the filling pipe, and the diameter of the liquid injection hole is small, which is used to connect the small hollow layer inside.

According to the flat one-way heat transfer tube according to the embodiment of the first aspect of the present invention, a protrusion is provided on one side of the holder, and the pipe hole and the liquid injection hole are provided at the protrusion. The bulge can increase the wall thickness at this location, which is convenient for processing.

According to the flat unidirectional heat transfer heat pipe according to the embodiment of the first aspect of the present invention, the material of the first metal sheet and the second metal sheet is copper, and copper has good thermal conductivity.

According to an embodiment of the second aspect of the present invention, a method for manufacturing a flat unidirectional heat transfer tube is provided, comprising the following steps:

S1. Preliminarily cut the shapes of the first metal sheet, the second metal sheet and the cage, and the cage is annular;

S2. Process the first metal sheet and the second metal sheet respectively, so that a boss is formed in the middle of a surface of the first metal sheet and the second metal sheet;

S3. Process a liquid injection hole and a pipe hole on one side of the cage;

S4. Machining microstructures on the bosses of the first metal sheet and the second metal sheet by a laser engraving machine, and performing hydrophilic treatment on the bosses;

S5. Install the first metal sheet and the second metal sheet on the upper and lower sides of the cage respectively, the boss is fitted with the hollow part of the cage, and the tube hole position of the cage is inserted into the liquid-filled a tube, the first metal sheet and the cage and between the second metal sheet and the cage are sealed and connected by high temperature resistant glue;

S6. inject the working liquid through the liquid filling pipe, and perform vacuum treatment through the liquid filling pipe;

S7. Seal the liquid filling tube.

Beneficial effect: The processing method of the flat unidirectional heat transfer heat pipe realizes the unidirectional flow of the liquid inside the heat pipe by processing the surface with microstructures on the first metal sheet and the second metal sheet, and performing hydrophilic treatment, avoiding reverse reaction. To transfer heat, when a fault occurs, the temperature of the condensation section is higher than that of the evaporation section, which can well protect the electronic components of the evaporation section.

According to the processing method of the flat one-way heat transfer tube according to the embodiment of the second aspect of the present invention, in the step S7, the specific operations are: stamping the liquid-filled tube to deform it, and then welding the nozzle. Sealing treatment, thus forming a sealing port, effectively isolating the outside world, and sealing the inside of the heat pipe.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings:

1 is a schematic diagram of an external structure of an embodiment of the present invention;

Fig. 2 is the exploded structure schematic diagram of the embodiment of the present invention;

3 is a schematic structural diagram of a first metal sheet or a second metal sheet according to an embodiment of the present invention;

4 is a partial enlarged view of the first metal sheet or the second metal sheet according to the embodiment of the present invention;

FIG. 5 is a schematic view of a cutaway structure of a cage according to an embodiment of the present invention;

6 is a schematic diagram of the working principle of an embodiment of the present invention;

Reference numerals: first metal sheet 10, boss 11, second metal sheet 20, cage 30, protrusion 31, tube hole 32, liquid injection hole 33, microstructure 40, bump group 41, first bump 411 , the second bump 412 , the hollow layer 50 , and the liquid filling tube 60 .

Detailed ways

This part will describe the specific embodiments of the present invention in detail, and the preferred embodiments of the present invention are shown in the accompanying drawings. Each technical feature and overall technical solution of the invention should not be construed as limiting the protection scope of the invention.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or position relationship indicated by up, down, front, rear, left, right, etc., is based on the azimuth or position relationship shown in the drawings, only In order to facilitate the description of the present invention and simplify the description, it is not indicated or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including this number, above, below, within, etc. are understood as including this number. If it is described that the first and the second are only for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance, or indicating the number of the indicated technical features or the order of the indicated technical features. relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

Referring to FIG. 1, an embodiment of the present invention provides a flat one-way heat transfer heat pipe, the outer ends of which are respectively a heating end and a heat dissipation end, and the end engraved with the word "hot" is the heating end, generally placed heating components, such as chips Etc.; the end with the word "cold" engraved is the heat-dissipating end, and heat-dissipating components such as electric fans are often placed on this end. The flat unidirectional heat transfer heat pipe of this embodiment can realize unidirectional heat transfer, and the heat from the heating end is transferred to the radiating end along the flat unidirectional heat transfer heat pipe.

2 and 6 , the flat unidirectional heat transfer pipe of this embodiment includes a first metal sheet 10 , a second metal sheet 20 and a cage 30 , the cage 30 is annular, the first metal sheet 10 and the second metal sheet 10 The sheet 20 has the same structure and is made of copper or other metals with good thermal conductivity to facilitate heat transfer. The first metal sheet 10 and the second metal sheet 20 are arranged opposite each other up and down, and the cage 30 is arranged on the first metal sheet 10 and the second metal sheet. Between the sheets 20, the opposite inner surfaces of the first metal sheet 10 and the second metal sheet 20 are machined with microstructures 40 in the same direction and subjected to hydrophilic treatment. The two metal sheets 20 and the cage 30 are sealed and connected by high temperature resistant glue to ensure the internal sealing. After the connection, there is a predetermined gap between the first metal sheet 10 and the second metal sheet 20. A hollow layer 50 is formed between the inner wall surfaces.

The upper and lower layers inside the heat pipe are surfaces with microstructures 40, and are treated with hydrophilicity, so that the liquid can be attached to it and flow in one direction.

One side of the cage 30 is provided with a through hole connecting the hollow layer 50 with the outside, and the through hole is connected with an external liquid filling pipe 60. The liquid filling pipe 60 can be a copper pipe, and the working liquid is injected into the heat pipe through the liquid filling pipe 60, In addition, a vacuuming device is used to connect the liquid filling pipe 60, which can vacuumize the inside of the heat pipe, which can reduce the pressure inside the heat pipe, reduce the boiling point of the working liquid, and make the liquid easier to evaporate to form steam, so that the heat pipe can operate at a lower temperature. work normally. After the liquid injection and vacuuming are completed, the inlet of the liquid filling pipe 60 is sealed, so that the inside of the heat pipe is in a sealed state.

3 and 4, it is the structure of the first metal sheet 10 or the second metal sheet 20. In this embodiment, bosses 11 are processed on the opposite surfaces of the first metal sheet 10 and the second metal sheet 20. The microstructure 40 is processed on the boss 11 and the hydrophilic treatment is performed, and the boss 11 can be fitted with the cage 30 to locate the position of the first metal sheet 10 and the second metal sheet 20, and can improve the sealing performance, In addition, the distance between the predetermined gap between the first metal sheet 10 and the second metal sheet 20 is reduced. When the predetermined gap is smaller, the unidirectional flow effect of the liquid is better, and the liquid is easier to adhere to the microstructure 40 .

Specifically, the microstructure 40 includes several bump groups 41 . The bump groups 41 are evenly arranged along the length and width directions of the first metal sheet 10 or the second metal sheet 20 . The two bumps 412, the first bumps 411 and the second bumps 412 are spaced in a V-shape. The convex group 41 is V-shaped and has directionality. The uniform arrangement of the convex group 41 realizes the unidirectional flow characteristic of the liquid on the surface. The wide and narrow directions of the V-shaped mouth determine the flow direction of the liquid. .

It can be understood that the microstructure 40 is not limited to the above-mentioned structure, as long as the unidirectional flow of the liquid can be realized.

5 , the through hole includes a pipe hole 32 and a liquid injection hole 33 , wherein the pipe hole 32 is connected to an external liquid filling pipe 60 , and both ends of the liquid injection hole 33 are respectively connected to the hollow layer 50 and the pipe hole 32 . The diameter of the pipe hole 32 is relatively large, which is used to install and fix the liquid filling pipe 60, and the diameter of the liquid injection hole 33 is relatively small, which is used to communicate with the smaller hollow layer 50 inside.

One side of the cage 30 is provided with a protrusion 31, and the pipe hole 32 and the liquid injection hole 33 are provided at the protrusion 31. The protrusion 31 can increase the wall thickness of this position, which is convenient for processing the pipe hole 32 and the liquid injection hole 33. .

6 , the working principle of the flat one-way heat transfer heat pipe of this embodiment is as follows:

The inner two ends of the heat pipe are the evaporation section and the condensation section, respectively, corresponding to the external heating end and the heat dissipation end. The working liquid is poured into the heat pipe, and the working liquid can be directly used water. After hydrophilic treatment, the working liquid can be attached to the microstructure 40 and flow in one direction, which is equivalent to a liquid absorbing core and is a liquid channel. The hollow layer 50 between the first metal sheet 10 and the second metal sheet 20 is The air layer is equivalent to an air channel, and the vapor formed by the evaporation of the working liquid flows in the hollow layer 50 .

The left side of the heat pipe is the evaporation section, which is in contact with the external heating element, and the right side of the heat pipe is the condensation section, which is in contact with the heat dissipation element.

Under normal circumstances, the temperature of the evaporation section is higher than the temperature of the condensation section. When the working liquid is in the evaporation section, due to the high temperature, the endothermic phase changes to form steam, and the steam flows to the condensation section through the hollow layer 50; , the temperature is lower, so that the steam exothermic phase changes to form a liquid. Since the liquid can flow unidirectionally on the surfaces with the microstructures 40 in the upper and lower layers, the liquid flows along the microstructures 40 to the evaporation section, and then forms through the endothermic phase change. The steam, in such a cycle, undergoes a process of endothermic and exothermic processes in the process of phase change, and finally achieves heat transfer and reduces the temperature of the heating element.

When the electronic device fails, such as the radiator component catches fire, the temperature of the heat dissipation end may be higher than the temperature of the heating end, that is, the temperature of the condensation section inside the heat pipe is higher than the temperature of the evaporation section. At this time, the liquid in the condensation section Due to the higher temperature, the endothermic phase changes to form steam, and the steam flows through the hollow layer 50 to the evaporation section. Due to the lower temperature of the evaporation section, the steam exothermic phase changes to form liquid, but because the liquid has the surface of the microstructure 40 in the upper and lower layers It has the characteristics of unidirectional flow, the liquid cannot flow to the condensation section, so it cannot form a circulation, the heat transfer efficiency is reduced or the heat transfer is completely impossible, and finally it plays the role of protecting the important components of the evaporation section.

The flat unidirectional heat transfer heat pipe of this embodiment is flat as a whole, has a small thickness, a compact structure, and occupies a small space, and is suitable for use in a small-volume electrical device.

An embodiment of the present invention also provides a method for manufacturing a flat unidirectional heat transfer tube, comprising the following steps:

S1. Preliminarily cut the shapes of the first metal sheet 10, the second metal sheet 20 and the retainer 30 by a laser cutting device, wherein the retainer 30 is annular;

S2. Process the first metal sheet 10 and the second metal sheet 20 respectively, use a machine tool to mill a layer around one surface of the first metal sheet 10, and do the same treatment for the second metal sheet 20, so that the first metal sheet 10 and The middle part of a surface of the second metal sheet 20 forms the shape of the boss 11;

S3. Use a drilling machine to machine a liquid injection hole 33 and a pipe hole 32 on one side of the cage 30;

S4. The microstructure 40 is processed on the bosses 11 of the first metal sheet 10 and the second metal sheet 20 by a laser engraving machine, and the bosses 11 are treated with hydrophilicity;

S5. Install the first metal sheet 10 and the second metal sheet 20 on the upper and lower sides of the cage 30, respectively, the boss 11 is fitted with the hollow part of the cage 30, and the pipe hole 32 of the cage 30 is inserted into the liquid filling pipe 60, the first metal sheet 10 and the cage 30 and the second metal sheet 20 and the cage 30 are sealed and connected by high temperature resistant glue;

S6. Inject the working liquid through the liquid filling pipe 60, and perform vacuum treatment through the liquid filling pipe 60;

S7. Stamping the liquid-filled pipe 60 to deform it, and then welding and sealing the nozzle to form a sealed state inside the heat pipe.

S8. One-way heat transfer test is performed on the heat pipe to ensure normal use.

In the processing method of the flat one-way heat transfer heat pipe in this embodiment, the surface with the microstructure 40 is processed on the first metal sheet 10 and the second metal sheet 20, and the surface with the microstructure 40 is processed, and the hydrophilic treatment is performed to realize the one-way flow of the liquid inside the heat pipe. flow, avoid reverse heat transfer, and protect the electronic components of the evaporation section when the temperature of the condensing section is higher than the temperature of the evaporation section when a fault occurs.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments. Within the scope of knowledge possessed by those of ordinary skill in the technical field, various modifications can be made without departing from the purpose of the present invention. kind of change.

Claims (10)

1. A flat, unidirectional heat transfer heat pipe, comprising:

the device comprises a first metal sheet and a second metal sheet, wherein the first metal sheet and the second metal sheet are oppositely arranged, a preset gap is formed between the first metal sheet and the second metal sheet, and the opposite inner side surfaces of the first metal sheet and the second metal sheet are provided with microstructures with the same direction and are subjected to hydrophilic treatment; and

the retainer is annular and is arranged between the first metal sheet and the second metal sheet, and a hollow layer is formed between the preset gap and the inner wall surface of the retainer.

2. A flat unidirectional heat transfer heat pipe as claimed in claim 1 wherein: the inner side surfaces of the first metal sheet and the second metal sheet which are opposite to each other are provided with bosses, the bosses are embedded with the retainer, and the bosses are provided with the microstructures and hydrophilic treatment.

3. A flat unidirectional heat transfer heat pipe as claimed in claim 1 wherein: the 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 first metal sheet or the second 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. A flat unidirectional heat transfer heat pipe as claimed in claim 1 wherein: the first metal sheet and the retainer and the second metal sheet and the retainer are hermetically connected through high-temperature-resistant glue.

5. The flat unidirectional heat transfer heat pipe of any one of claims 1 to 4, wherein: and a through hole for connecting the hollow layer with the outside is arranged on one side of the retainer, and the through hole is connected with a liquid charging pipe.

6. A flat unidirectional heat transfer heat pipe as claimed in claim 5 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 hollow layer and the pipe hole, and the diameter of the liquid injection hole is smaller than that of the pipe hole.

7. A flat unidirectional heat transfer heat pipe as claimed in claim 6 wherein: and one side of the retainer is provided with a bulge, and the pipe hole and the liquid injection hole are arranged at the bulge.

8. A flat unidirectional heat transfer heat pipe as claimed in claim 1 wherein: the first metal sheet and the second metal sheet are made of copper.

9. A processing method of a flat unidirectional heat transfer heat pipe is characterized by comprising the following steps:

s1, preliminarily cutting shapes of a first metal sheet, a second metal sheet and a retainer, wherein the retainer is annular;

s2, respectively processing the first metal sheet and the second metal sheet to form a boss in the middle of one surface of the first metal sheet and the second metal sheet;

s3, processing a liquid injection hole and a pipe hole on one side of the retainer;

s4, processing microstructures on bosses of the first metal sheet and the second metal sheet respectively through a laser engraving machine, and carrying out hydrophilic treatment on the bosses;

s5, the first metal sheet and the second metal sheet are respectively installed on the upper side and the lower side of the retainer, the boss is embedded with the hollow part of the retainer, a liquid filling pipe is inserted into the pipe hole of the retainer, and the first metal sheet and the retainer and the second metal sheet and the retainer are hermetically connected through high-temperature-resistant glue;

s6, injecting working liquid through the liquid filling pipe, and performing vacuum pumping treatment through the liquid filling pipe;

and S7, sealing the liquid filling pipe.

10. A method for manufacturing a flat unidirectional heat transfer heat pipe according to claim 9, wherein in step S7, the specific operations are as follows: and stamping the liquid filling pipe to deform the liquid filling pipe, and then welding and sealing the pipe orifice.

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