TWI585356B - Plate-type heat pipe - Google Patents

Description

Flat heat pipe

The invention relates to a heat pipe, in particular to a flat heat pipe.

At present, heat pipes are widely used in the industry to solve high-density heat dissipation problems of high-speed computers, such as heat pipes, loop heat pipes, and Vapor Chambers.

The working principle of the flat heat pipe is the same as that of the traditional heat pipe. Because it has a larger heat conduction area than the traditional heat pipe and meets the high practical value of “light, thin, short and small”, it is widely used in electrons with a large heat dissipation surface. On the product.

A conventional flat heat pipe includes a metal casing and a continuous capillary structure uniformly attached to the inner surface of the metal casing. The capillary structure includes a vapor passage therein. When the flat heat pipe is working, the working medium in the capillary structure evaporates due to heat and enters the steam passage. The working medium entering the steam passage from the capillary structure easily interferes with each other to form a turbulent flow, thereby causing a hot spot to be locally formed in the casing, so that heat cannot be uniformly distributed from all parts of the casing.

In view of this, it is necessary to provide a flat heat pipe having good heat dissipation performance.

A flat heat pipe includes a casing having a receiving space formed therein and a capillary structure and a working medium disposed in the receiving space, the flat heat pipe further comprising a partition, wherein upper and lower opposite ends of the partition respectively abut Toping the opposite inner surfaces of the housing The accommodating space is divided into a first channel and a second channel which are arranged side by side. Meanwhile, the partition plate divides the capillary structure into two opposite sides and are respectively located in the first channel and the second channel. Two capillary parts.

Compared with the prior art, the flat heat pipe of the present invention divides the receiving space into the first channel and the second channel by the partition plate, and the two capillary portions of the capillary structure are respectively distributed on one side of the first channel and the second channel, so that After the working medium evaporates, the mutual interference between the evaporating gases is small, and the distribution of the evaporating gas in the first channel and the second channel is relatively uniform, thereby avoiding the generation of turbulent flow and achieving a uniform outward heat transfer effect.

The invention will now be further described with reference to the specific embodiments thereof with reference to the accompanying drawings.

1‧‧‧ flat heat pipe

10‧‧‧shell

11‧‧‧ top board

13‧‧‧floor

15‧‧‧Connecting board

17‧‧‧ accommodating space

30‧‧‧Baffle

50‧‧‧Capillary structure

51‧‧‧ waist

53‧‧‧ affiliation department

55‧‧‧Makeup

171‧‧‧First Passage

173‧‧‧second channel

531‧‧‧ affixed

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic transverse view of a flat heat pipe of the present invention.

Figure 2 is a schematic longitudinal view of the flat heat pipe of the present invention.

Referring to FIG. 1, the flat heat pipe 1 of the present invention comprises a casing 10, a partition 30 located in the casing 10, a capillary structure 50 and a plurality of working mediums (not shown).

The housing 10 is integrally formed of a material having good thermal conductivity such as brass, copper alloy, etc., and includes an elongated top plate 11, an elongated base plate 13 spaced apart from and parallel with the top plate 11, and a top plate 11 and a bottom plate 13 Two curved connecting plates 15 at the edges. The distance between the outer surfaces of the top plate 11 and the bottom plate 13 is between 0.8 mm and 2.0 mm, that is, the height of the entire casing 10 is between 0.8 mm and 2.0 mm. The top plate 11, the bottom plate 13 and the connecting plate 15 together form an elongated receiving space 17.

The capillary structure 50 is a woven mesh structure woven from a metal wire such as copper, silver or aluminum wire or a powder sintered structure formed by sintering a metal powder. The capillary structure 50 is along the housing 10 The longitudinal direction is disposed in the middle of the accommodating space 17 and the upper surfaces of the top plate 11 and the bottom plate 13 are respectively attached to the upper and lower ends. In this embodiment, the capillary structure 50 is a longitudinal strip having a length corresponding to the length of the top plate 11 and a cross-section substantially in the shape of a "work", including a waist portion 51 and two attachment portions at the upper and lower ends of the waist portion 51. 53. The lateral width of each of the attachment portions 53 is wider than that of the waist portion 51, and the longitudinal length is equal to the length of the waist portion 51. Each of the affixing portions 53 has an elongated mounting surface 531 for attaching to a corresponding surface of the housing 10. The edge of the surface of each of the attachment portions 53 opposite to the attachment surface 531 is excessively inclined at an angle of 45 degrees to the side surface to which the attachment surface 531 is connected, for increasing the contact area of the capillary structure 50 with the working medium.

The separator 30 is a longitudinal solid plate body made of a material having good thermal conductivity and a certain compressive strength, such as metal. The length of the partition 30 is equivalent to the length of the top plate 11 of the casing 10, and the height is equal to the distance between the top plate 11 and the inner surface of the bottom plate 13.

The partition plate 30 is disposed in the middle of the capillary structure 50 along the longitudinal direction of the casing 10 and has upper and lower ends perpendicular to the inner surfaces of the top plate 11 and the bottom plate 13, respectively. Thus, the partition 30 divides the capillary structure 50 into two bristles 55 respectively attached to opposite sides thereof in the longitudinal direction, and the partition 30 divides the accommodating space 17 into a first passage 171 and a second side by side. Channel 173. The two capillary portions 55 are respectively located in the first passage 171 and the second passage 173 of the receiving space 17 . Since the length of the partition plate 30 is the same as the length of the top plate 11 and the bottom plate 13 of the casing 10, the accommodating space 17 is divided into the first passage 171 and the second passage 173 which are not in communication with each other in the running direction of the working medium.

Referring to FIG. 2 at the same time, when the bottom plate 13 of the flat heat pipe 1 is in contact with a heat source to absorb heat, the working medium therein is evaporated by heat, and the evaporated working medium is respectively in the first channel 171 and the second channel 173. 2 refers to the direction of the arrow, through the top The plate 11 is condensed by heat dissipation to the outside, and the condensed working medium is quickly returned to the bottom plate 13 due to the pulling of the bristles 55. At the same time, the partition 30 also rapidly transfers the heat absorbed thereby to the top plate 11 to dissipate, thereby enhancing the heat transfer efficiency of the flat heat pipe 1.

Since the attachment portion 53 of the capillary structure 50 in contact with the top plate 11 is wider than the waist portion 51, the contact area of the capillary structure 50 with the condensed working medium is increased. At the same time, since the attaching portion 53 which is in contact with the bottom plate 13 is larger than the waist portion 51, an inverted funnel structure is formed, and the working medium is quickly pulled back to speed up the reflow speed of the working medium.

Because the partition 30 is located in the middle of the casing 10 and divides the receiving space 17 into the first passage 171 and the second passage 173, and the capillary portion 55 is distributed only on one side of the first passage 171 and the second passage 173, so that the working medium evaporates. After that, the mutual interference between the evaporation gases is small, and the distribution of the evaporation gas in the first passage 171 and the second passage 173 is relatively uniform, thereby avoiding the generation of turbulence and achieving a uniform outward heat transfer effect. At the same time, since the partition 30 has a certain compressive strength, the deformation resistance of the casing 10 can be enhanced, and the stability of the flat heat pipe 1 is further ensured.

It can be understood that in other embodiments, the partition plate 30 may be disposed along the width direction of the casing 10 as long as it can divide the accommodating space 17 through which the working medium evaporated inside the casing 10 flows. It can be understood that a plurality of partitions 30 may be provided inside the casing 10 as needed to divide the accommodating space 17 into a required number of passages.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

1‧‧‧ flat heat pipe

10‧‧‧shell

11‧‧‧ top board

13‧‧‧floor

15‧‧‧Connecting board

17‧‧‧ accommodating space

30‧‧‧Baffle

50‧‧‧Capillary structure

51‧‧‧ waist

53‧‧‧ affiliation department

55‧‧‧Makeup

171‧‧‧First Passage

173‧‧‧second channel

531‧‧‧ affixed

Claims (10)

A flat heat pipe includes a casing having a receiving space formed therein and a capillary structure and a working medium disposed in the receiving space, wherein the flat heat pipe further comprises a partition, and the partition is vertically opposed The two ends respectively abut the opposite inner surfaces of the housing to divide the receiving space into a first channel and a second channel, and the partition divides the capillary structure into separate ones. The capillary structure has a cross section of an "work" shape on its opposite sides and respectively located in the first channel and the second channel, and includes a waist portion and two attachment portions respectively located at upper and lower ends of the waist portion. The two affixing portions are respectively attached to the central portion of the inner surface of the housing, and the edge of the surface of each of the affixing portions opposite to the affixing surface is a 45-degree circular arc to the side surface connected to the affixing surface. Excessive angles are used to increase the contact area of the capillary structure with the working medium. The flat heat pipe of claim 1, wherein the first passage and the second passage are not in communication in a running direction of the working medium. The flat heat pipe according to claim 2, wherein the casing comprises an elongated top plate and an elongated bottom plate spaced apart from the top plate and disposed opposite to each other, the partition plate being disposed along the length direction of the top plate The top surface of the top plate and the bottom plate respectively abut against the upper and lower ends of the casing. The flat heat pipe according to claim 3, wherein the length of the partition is the same as the length of the top plate and the bottom plate of the casing, thereby dividing the receiving space into the first passage that is not in communication with each other in the running direction of the working medium. And the second channel. The flat heat pipe according to claim 1, wherein the separator is a solid plate body having good thermal conductivity. The flat heat pipe according to claim 3, wherein the capillary structure is a longitudinal strip And disposed along the longitudinal direction of the top plate in the middle of the casing and the upper and lower opposite ends respectively abut the inner surfaces of the top plate and the bottom plate. The flat heat pipe according to claim 6, wherein the two attachment portions are respectively attached to inner surfaces of the top plate and the bottom plate. The flat heat pipe of claim 6, wherein the partition is located in a middle portion of the capillary structure. The flat heat pipe of claim 3, wherein a distance between the outer surfaces of the top plate and the bottom plate is between 0.8 mm and 2.0 mm. A flat heat pipe includes a casing having a receiving space formed therein and a capillary structure and a working medium disposed in the receiving space, wherein the flat heat pipe further comprises a partition, the partitioning the receiving space Dividing into a first channel and a second channel, the opposite sides of the partition plate respectively face the first channel and the second channel, the capillary structure comprises two capillary portions, and the two capillary portions are respectively disposed on the The cross-sectional surface of the capillary structure has an "work" shape on the opposite side surfaces of the partition plate, and includes a waist portion and two affixing portions respectively located at upper and lower opposite ends of the waist portion, and the two affixing portions are respectively attached to the In the middle of the inner surface of the casing, the edge of each of the tiling portions is excessively angled at a 45 degree angle to increase the contact area between the capillary structure and the working medium.