TWI799005B - Heat conduction plate and its manufacturing method - Google Patents

Abstract

A manufacturing method includes: the first shell merges with the second shell to form a hollow vapor chamber and receives the capillary structure, the first shell covers the second shell so that the narrow passage leads to the connection end of the vapor chamber, so that the suction end of the narrow passage Exposed outside the first shell, the convex part of the capillary structure protrudes out of the steam chamber and is placed between the first shell and the second shell, welding the first shell and the second shell around the vapor chamber, but skipping the narrow passage With the convex part, it becomes the semi-finished product of the heat guide plate, and creates a liquid suction gap around the convex part; the working fluid enters the steam chamber through the liquid suction gap; closes the liquid suction gap to determine the flow rate of the working fluid; lowers the steam chamber through the suction end The gas density of the operating fluid is arranged on the steam chamber and the capillary structure; and, the suction end is closed to determine the fluid pressure value of the steam chamber, and the finished product of the heat conduction plate is made to meet the demand for thinning.

Description

Heat conduction plate and its manufacturing method

The invention relates to a method for making a heat conducting plate, which guides working fluid into a vapor chamber. According to this method, a heat conduction plate (or a uniform temperature plate) with a vapor chamber is made.

It is known that the working fluid undergoes a phase change in the vapor chamber, which improves the heat transfer rate and has a better heat dissipation effect. With the thinning of mobile devices, the volume of the heat conduction plate with the vapor chamber is reduced, which relatively increases the difficulty of introducing the working fluid into the vapor chamber.

Add some tubes or channels to the existing heat guide plate to guide the working fluid into the vapor chamber. When complete, remove the tube body or runner from the heat spreader. Some heat spreaders use air chambers to do the job of introducing the working fluid into the vapor chamber.

In fact, the thinner the thermal guide plate is, the narrower the inlet is, making it difficult to fill the working fluid and reducing the production efficiency of the thermal guide plate.

Therefore, how to increase the flow rate of the working fluid into the vapor chamber and improve the manufacturing process of the thermal conductive plate has become an urgent problem to be solved in the present invention.

In view of this, the inventor of this case proposed a new manufacturing method, the main purpose of which is to allow the working fluid to enter the steam chamber of the semi-finished heat guide plate through the liquid suction gap, reduce the gas density of the steam chamber through the suction end, and then close the steam chamber to obtain The finished thermal plate.

Other purposes of the present invention are to use decompression to remove gas from the steam chamber, relatively increase the speed of working fluid to arrange the steam chamber and capillary structure, and improve the production efficiency of the thinned heat conducting plate.

Due to the achievement of the above-mentioned purpose, the method for manufacturing a heat conduction plate of the present invention includes the following process: The first shell merges with the second shell to form a hollow vapor chamber and receives the capillary structure. The first shell covers the second shell and leads to the connection end of the vapor chamber with a narrow passage, so that the suction end of the narrow passage exposes the first shell. In vitro, the convex part of the capillary structure extends out of the steam chamber and is placed between the first shell and the second shell, welding the first shell and the second shell around the steam chamber, but skipping the narrow passage and the convex part, Become a semi-finished product of the heat guide plate, and create a liquid suction gap around the convex part; The working fluid enters the vapor chamber through the suction gap; Close the suction gap to determine the flow of working fluid; The gas density of the vapor chamber is reduced through the suction port, and the operating working fluid is arranged on the vapor chamber and the capillary structure; and Close the suction end, determine the fluid pressure value of the steam chamber, and make the finished product of the heat conduction plate.

Wherein, the opening of the receiving groove of the first housing faces the opening of the air chamber of the second housing to form a hollow vapor chamber. Furthermore, the capillary structure is placed into the holding tank and contacts the particles at the bottom of the air chamber.

Described method makes a kind of thermal guide plate, comprises: A receiving groove is formed on the bottom surface of the first housing; An air chamber is formed on the top surface of a second housing, and a connection end of a narrow passage leads to the air chamber, and the other end is an air suction end; and A protrusion extends around a capillary structure.

When the bottom surface of the first casing touches the top surface of the second casing, the first casing covers the connecting end of the narrow passage, so that the suction end is exposed outside the first casing. The opening of the accommodating groove faces the opening of the air chamber to form a steam chamber, which receives the working fluid and capillary structure, and the convex part extends out of the steam chamber and is placed between the first casing and the second casing. There is at least one liquid suction gap around the convex part. The first casing and the second casing around the vapor chamber are welded, the suction end and the liquid suction gap are closed, and the working fluid and capillary structure are retained in the sealed vapor chamber.

Wherein, the capillary structure is put into the accommodating groove. Also, the capillary structure contacts the bottom of the gas chamber to array a set of particles.

In this way, the method of the present invention allows the working fluid to enter the steam chamber of the semi-finished heat conduction plate through the liquid suction gap, reduces the gas density of the steam chamber through the suction port, and then closes the vapor chamber to obtain the finished heat conduction plate. Of course, the use of decompression to remove the gas in the steam chamber can relatively increase the speed of the working fluid to arrange the steam chamber and the capillary structure, and improve the production efficiency of the thinner heat conduction plate, which meets the demand for thinner.

In order to make the purpose, features and advantages of the present invention easy to understand, one or more preferred embodiments will be described in detail as follows in conjunction with the attached drawings.

Next, in conjunction with the accompanying drawings, describe the embodiment of this case. In the drawings, the same or similar structures or units are denoted by the same reference numerals. It is foreseeable that the described embodiments are only some examples of this case, not all embodiments. Other embodiments that can be deduced based on the examples described above, or structures that can be modified or changed as needed, all belong to the scope of protection of this case.

In the following descriptions, directional terms such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer" and "side" refer only to the directions of the drawings . The use of directional terms is for a better and clearer description and understanding of this case, and does not express or imply that the device or component described must have a specific orientation, structure, and operation, so it cannot be understood as a limitation on the technical content of this case.

In the following descriptions, "mounted", "connected", "connected" or "set on" should be interpreted in a broad sense, such as fixed connection, detachable connection, integral connection, mechanical connection, unless there are specific and clear specifications and limitations , directly connected, indirectly connected, or internally connected between two elements. Those skilled in the field of this case can understand the specific meanings of the above terms in each embodiment and even this case by virtue of common knowledge or experience.

Unless otherwise specified, in the following description, "plurality" means two or more.

Figure 1 is a flow chart showing that the present invention starts from a "combination 10" step, goes through two steps of "suction 12" and "sealing of liquid suction port 14", and after performing a "pumping 16" procedure, to a " The air suction port sealing 18" step is completed, and the finished product of the thermal guide plate is produced.

Before describing the manufacturing process, let us understand that a heat conducting plate 20 as shown in FIGS. Wherein, the first shell 21 is a thin rectangular sheet with a top surface 22 and a bottom surface 23 . A receiving groove 24 is formed in the middle portion of the bottom surface 23 , and the first casing 21 is defined by two sides 25 , a wide side 26 and a narrow side 27 around the receiving groove 24 .

The second casing 30 is also a thin rectangular piece, and also has a top surface 31 and a bottom surface 32 . The difference is that an air chamber 33 is formed in the middle of the top surface 31, and the four sides surrounding the air chamber 33 of the second casing 30 are regarded as side edges 36, wide sides 37 and narrow sides 38, and the wide sides 37 Into two narrow passages 39, one connecting end 39a of the narrow passage 39 leads to the air chamber 33, and the other end is the suction end 39b. In addition, a set of particles 35 is arrayed at the bottom 34 of the air chamber 33 .

The capillary structure 40 has a rectangular design with two long sides 42 and two short sides 43 . One indicating portion 44 and one convex portion 45 are respectively disposed on the two short sides 43 . Between the two long sides 42 is a set of meshes 41 arrayed in the capillary structure 40 . In this embodiment, the indicating portion 44 is a semicircular groove. In some embodiments, the indicating part 44 is other geometric shapes.

Next, the process of making the heat conducting plate 20 will be described in conjunction with FIGS. 1-6.

In the "Assembly 10" step, in the mode of side 25 to side 36, wide side 26 to wide side 37 (or narrow side 27 to narrow side 38), the first casing 21 is combined with the second casing 30 to form A hollow vapor chamber 50 receives the capillary structure 40 .

The steam chamber 50 referred to here generally refers to the opening of the receiving tank 24 facing the opening of the air chamber 33 , which together form a certain volume of internal space. Moreover, the capillary structure 40 is placed in the containing groove 24 and contacts the particles 35 at the bottom 34 of the air chamber 33 .

During merging, the wide side 26 of the first casing 21 shields the connecting end 39 a of the narrow passage 39 leading to the vapor chamber 50 , so that the suction end 39 b of the narrow passage 39 is exposed outside the first casing 21 . The protrusion 45 now protrudes beyond the vapor chamber 50 and is inserted between the two narrow sides 27 , 38 (or the first housing 21 and the second housing 30 ). The first and second housings 21 and 30 around the steam chamber 50 are welded, but the narrow passage 39 and the convex portion 45 are skipped over to become a semi-finished product of the heat conducting plate 20 . At least one suction gap 51 is formed on the periphery of the protrusion 45 surrounded by the two narrow sides 27 , 38 .

In the step of “liquid absorption 12 ”, the working fluid (not shown) enters the vapor chamber 50 through the liquid absorption gap 51 . Along the direction of the suction 52 (see FIG. 6 ), the working fluid (such as water) usually diffuses into the steam chamber 50 through the gap between the convex portion 45 and the two narrow sides 27 , 38 according to the capillary phenomenon.

In the procedure of "sealing the liquid suction port 14", two narrow sides 27, 38 are welded to cover the section of the convex part 45, and the liquid suction gap 51 is closed so that it cannot be blocked to the outside world, thereby determining the flow rate of the working fluid into the steam chamber 50.

In the step of "air extraction 16", a set of decompression equipment (not shown) is used to generate controllable suction force against the air extraction end 39b along the direction of extraction 53 (see Figure 6). Because the gas density of the vapor chamber 50 is reduced, the speed at which the working fluid is disposed in the vapor chamber 50 and the capillary structure 40 becomes fast and uniform.

Finally, there is the step of "sealing the suction port 18", welding the wide side 26 of the first housing 21 to cover the section of the narrow passage 39, blocking the narrow passage 39 and closing the suction end 39b, and determining the fluid (including water and air) of the steam chamber 50 The pressure value is to make the finished product of the heat conduction plate 20, which meets the requirement of thinning.

Specifically, the heat conducting plate 20 manufactured by the method includes: a receiving groove 24 is formed on the bottom surface 23 of a first casing 21; an air chamber 33 is formed on a top surface 31 of a second casing 30, and a narrow passage One connection end 39a of 39 leads to the air chamber 33, and the other end is the suction end 39b;

When the bottom surface 23 of the first casing 21 touches the top surface 31 of the second casing 30 , the first casing 21 covers the connecting end 39 a of the narrow channel 39 , so that the suction end 39 b is exposed outside the first casing 21 . The opening of the receiving groove 24 faces the opening of the air chamber 33 to form a vapor chamber 50, the vapor chamber 50 receives the working fluid and the capillary structure 40, and the protrusion 45 extends out of the vapor chamber 50 and is inserted into the first housing 21 and the Between the second shells 30 , there is at least one liquid suction gap 51 around the convex portion 45 . The first shell 21 and the second shell 30 around the vapor chamber 50 are welded, and the suction end 39b and the suction gap 51 are closed, so that the working fluid and the capillary structure 40 are retained in the sealed vapor chamber 50 .

Wherein, the capillary structure 40 is placed in the containing groove 24 , and the capillary structure 40 contacts the bottom 34 of the air chamber 33 to form a group of particles 35 .

Those skilled in the art can understand and make changes to the above-disclosed embodiments without departing from the broad concepts of the present disclosure. Therefore, this case is not limited to the specific embodiments disclosed in the specification, and all modifications made according to the spirit and technical scope of this case shall be covered and protected by the textual content defined in the scope of the patent application.

10: combination 12: liquid absorption 14: Liquid suction port seal 16: Air extraction 18: Air suction port seal 20: thermal guide plate 21: first housing 22, 31: top surface 23, 32: bottom surface 24: receiving groove 25, 36: side 26, 37: wide side 27, 38: narrow side 30: second housing 33: air chamber 34: Bottom 35: Particles 39: narrow road 40: capillary structure 41: mesh 42: long side 43: short side 44: indicating part 45: convex part 50: vapor chamber 51: suction gap 52: Suction 53: Suction

Fig. 1 is the process flow of the present invention to make the heat conduction plate. Figure 2 shows the components needed to make the heat guide. Figure 3 draws a top view of the heat spreader. Figures 4 and 5 are cutting the heat guide plate at different angles along Figure 3. Figure 6 sees through the action of introducing working fluid inside the heat guide plate.

10: combination

12: Suction

14: Liquid suction port seal

16: Pumping

18: Air suction port seal

Claims (6)

A heat conduction plate manufacturing method, comprising: the first shell merges with the second shell to form a hollow vapor chamber and receives a capillary structure; The suction end of the pump is exposed outside the first casing, the convex part of the capillary structure protrudes out of the steam chamber and is placed between the first casing and the second casing, and the first casing and the second casing around the steam chamber are welded, but Skip the narrow passage and the convex part to become a semi-finished product of the heat guide plate, and create a liquid suction gap around the convex part; the working fluid enters the steam chamber through the liquid suction gap; close the liquid suction gap to determine the flow rate of the working fluid; The end reduces the gas density of the steam chamber, and the operating fluid is arranged on the steam chamber and the capillary structure; and the exhaust end is closed to determine the fluid pressure value of the steam chamber, and the finished product of the heat conduction plate is made. The manufacturing method of the heat conducting plate according to claim 1, wherein the opening of the receiving groove of the first housing faces the opening of the air chamber of the second housing to form a hollow vapor chamber. The manufacturing method of the heat conduction plate as claimed in claim 2, wherein the capillary structure is placed in the containing groove and contacts the particles at the bottom of the air chamber. A heat conducting plate, comprising: a receiving groove is formed on the bottom surface of a first shell; an air chamber is formed on the top surface of a second shell, and one connection end of a narrow passage leads to the air chamber, and the other end is an air suction chamber. end; A capillary structure extends a convex portion around; when the bottom surface of the first housing contacts the top surface of the second housing, the first housing covers the connecting end of the narrow channel, so that the suction end is exposed outside the first housing; the receiving groove The opening of the air chamber faces the opening of the air chamber to form a steam chamber, which receives the working fluid and the capillary structure. The convex part protrudes from the steam chamber and is inserted between the first casing and the second casing. There is at least one liquid suction gap; the first casing and the second casing around the vapor chamber are welded, the suction end and the liquid suction gap are closed, and the working fluid and capillary structure are retained in the sealed vapor chamber. The heat conducting plate as claimed in claim 4, wherein the capillary structure is placed in the receiving groove. The heat conducting plate as claimed in claim 5, wherein the capillary structure contacts a group of particles arrayed at the bottom of the air chamber.

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