TWI619921B - Loop heat pipe structure - Google Patents

Abstract

A loop heat pipe structure comprises: an evaporation chamber, a tube body and a condensing unit; the evaporation chamber has an outlet and an inlet and an accommodating space, wherein the accommodating space has a capillary structure and a compensation a cavity and at least one vapor passage, wherein one end of the vapor passage is in communication with the outlet; the tubular body has a first end and a second end respectively connected to the outlet and the inlet of the evaporation chamber, the second end and the capillary The condensing unit disposed adjacent to the structure is disposed outside the first end and the second end; and the second end of the tube body is disposed adjacent to the capillary structure to increase the return efficiency of the working fluid.

Description

Loop heat pipe structure

A loop heat pipe structure, especially a loop heat pipe structure capable of improving the vapor-liquid circulation efficiency of a loop heat pipe.

With the improvement of the performance of current electronic devices, the electronic components that process signals and calculations are relatively hotter than the previous electronic components. The most commonly used heat dissipation components include heat pipes, heat sinks, temperature equalization plates, and the like. And by directly contacting the electronic components that will heat up, further increase the heat dissipation performance, and prevent the electronic components from being overheated and burned.

Furthermore, a fan with a forced heat dissipation effect is provided to dissipate the heat dissipating components, and the fan does have the effect of improving heat dissipation. However, in a limited space, not all fans can be provided, so the space problem is also a key point to consider. One.

Another manufacturer provides a loop heat pipe structure in which a vapor-liquid circulation concept is combined with a condensing device and a tube body is connected to form a loop module. The advantage is that one has its own a heat dissipating device having an effect of evaporating and condensing circulation, wherein the evaporating cavity is provided with a capillary structure for reflowing the working liquid, and the capillary structure is provided with a plurality of grooves for vapor flow, and the evaporation chamber is mainly composed of at least one side and heat The source contacts the heat transfer, and the working liquid in the capillary structure of the evaporation chamber is evaporated by the heat, flows outward from the grooves and passes through the tube connecting the evaporation chamber and the condensing device The flow is diffused to the condensing device, and finally condensed in a liquid state by the condensing device, and then returned to the evaporation chamber to continue to circulate.

At present, there are two kinds of relative positions between the compensation chamber and the vapor core (the capillary structure containing the steam passage) in the flat evaporator, one for the upper and lower phases and the other for the horizontal placement.

It is known that the upper and lower stacked flat evaporators are large in height and thickness, and are not suitable for places where the thickness is short, and the installation space is limited.

Another conventionally arranged flat plate evaporator requires the compensation chambers and the vapor cores which are originally arranged to overlap each other to be horizontally juxtaposed, so that the working fluid of the compensation chamber is far from the evaporation surface of the vapor core, and the working fluid is not compensated by the working fluid. Causes dry burning problems.

Therefore, how to improve the missing of the flat evaporator in the conventional loop heat pipe is the primary goal.

Accordingly, in order to solve the above-mentioned shortcomings of the prior art, the main object of the present invention is to provide a loop heat pipe structure that solves the problem that the working fluid compensation of the flat plate evaporator is less than that caused by dry burning. In order to achieve the above object, the present invention provides a loop heat pipe structure, comprising: an evaporation chamber, a tube body, and a condensation unit; the evaporation chamber has an outlet and an inlet and an accommodation space, The accommodating space has a capillary structure and a compensation cavity and at least one vapor passage, and one end of the vapor passage communicates with the outlet; the tubular body has a first end and a second end respectively corresponding to the evaporation chamber And an inlet connection, wherein the second end is disposed adjacent to the capillary structure.

The condensing unit has a plurality of heat dissipating fins disposed outside the first and second ends of the tube body.

By arranging one end of the inlet or the tube body of the evaporation chamber adjacent to the capillary structure, the efficiency of the backflow of the condensed working fluid can be accelerated, and the working fluid in the evaporation chamber can not be compensated for, so that the dry The problem of burning.

1‧‧‧Circular heat pipe structure

11‧‧‧Evaporation chamber

111‧‧‧Export

112‧‧‧ entrance

113‧‧‧ accommodating space

114‧‧‧Capillary structure

1141‧‧‧Vapor channel

115‧‧‧Compensation chamber

116‧‧‧Liquid channel

12‧‧‧ tube body

121‧‧‧ first end

122‧‧‧ second end

2‧‧‧Working fluid

21‧‧‧Vaporous working fluid

22‧‧‧Liquid working fluid

3‧‧‧heat source

13‧‧‧Condensation unit

131‧‧‧heat fins

1 is a perspective exploded view of a first embodiment of a loop heat pipe structure of the present invention; FIG. 2 is a cross-sectional view showing a first embodiment of the loop heat pipe structure of the present invention; and FIG. 3 is a loop heat pipe structure of the present invention. The second embodiment is a sectional view of the combination; and the fourth embodiment is a schematic diagram of the operation of the loop heat pipe structure of the present invention.

1 and 2 are a perspective exploded view and a combined cross-sectional view of a first embodiment of a loop heat pipe structure according to the present invention. As shown, the loop heat pipe structure 1 of the present invention comprises: an evaporation chamber 11 and a The tube body 12 and a condensing unit 13; the evaporation chamber body 11 is a flat plate evaporation chamber having an outlet 111 and an inlet 112 and an accommodating space 113. The accommodating space 113 has a capillary structure 114 therein. And a compensation chamber 115 and at least one vapor channel 1141, one end of the vapor channel 1141 is in communication with the outlet 111, and the inlet 112 and the outlet 111 are not necessarily disposed on the same side, and may be disposed on different sides. The accommodating space 113 is defined by the accommodating space 113. The evaporation chamber 11 further has a housing 11a and a bottom plate 11b, and correspondingly covers the evaporation chamber 11. The compensation chamber 115 is connected to the capillary. Structure 114 is horizontally corresponding.

The vapor passage 1141 is selectively disposed on the wall surface of the evaporation chamber 11 relative to the capillary structure 114 (the bottom plate 11b) or on the side of the capillary structure 114 opposite to the evaporation chamber 11 (the heating surface in contact with the heat source 3) In any of the embodiments, the present embodiment is provided on the side of the capillary structure 114 with respect to one side of the evaporation chamber 11 (heat receiving surface in contact with the heat source), but is not limited thereto.

The capillary structure 114 is disposed in the accommodating space 113 of the evaporation chamber 11 and defines the compensation cavity 115 together with the accommodating space 113. The inlet 112 and the outlet 111 are corresponding to the capillary structure 114. The capillary structure 114 is disposed between the inlet 112 and the outlet 111, and the inlet 112 is disposed opposite to the outlet 111, that is, after the working fluid 2 enters the evaporation chamber 11 from the inlet 112, The gravity can be quickly dropped into the capillary structure 114, and the efficiency of the return of the working fluid 2 can be further improved. After the capillary structure 114 is saturated with the working fluid 2, the excess working fluid 2 flows into the compensation chamber 115. The outlets 111, 112 may also be contoured or the outlet 111 may be higher than the inlet 112, and only the inlet 112 may be in direct contact with the capillary structure 114.

Further, a liquid passage 116 is connected to one end of the liquid passage 116. The liquid passage 116 is disposed on one side of the capillary structure 114, and the liquid passage 116 is respectively disposed on the capillary structure 114 corresponding to the steam passage 1141. Upper and lower sides.

The tube body 12 has a first end 121 and a second end 122 respectively connected to the outlet and the inlets 111 and 112 of the evaporation chamber 11. The second end 122 is disposed adjacent to the capillary structure 114.

The condensing unit 13 has a plurality of heat dissipating fins 131 that are sleeved between the first and second ends 121 and 122 of the tube body 12 .

The vapor passage 1141 is mainly capable of providing the vaporous working fluid 21 to flow for a diffusion condensation cycle. Further, a working fluid 2 is filled in the evaporation chamber 11 or the tube body 12. The working fluid 2 has a vapor state and a liquid state, and the vapor working fluid 21 and the liquid working fluid 22 It circulates inside the entire heat pipe structure 1 of the loop.

The condensing unit 13 is disposed between the first and second ends 121 and 122 of the tubular body 12. The condensing unit 13 is configured by any one of a plurality of heat radiating fins or a plurality of cooling tubes.

FIG. 3 is a cross-sectional view showing a second embodiment of the loop heat pipe structure of the present invention. As shown in the figure, the partial structure of the embodiment is the same as that of the first embodiment, and therefore will not be described herein again, but the implementation is omitted. The difference from the first embodiment is that the inlet 111 and the outlet 112 are disposed correspondingly to the left and right, that is, disposed on different sides of the evaporation chamber 11, and the second end 122 of the tube 12 is from the inlet. After entering the vapor chamber 11, the second end 122 extends to a side of the vapor chamber 11 away from the compensation chamber 115, that is, above the capillary structure 114, so that the liquid working fluid 22 is directly directed to the capillary Structure 114, after the capillary structure 114 is saturated with the liquid working fluid 22, the excess liquid working fluid 22 is directed to the compensation chamber 115 for storage, thereby facilitating rapid reflow of the liquid working fluid 22 into the capillary structure. 114, and improve the conventional capillary structure water shortage and dry burning and other issues.

Referring to FIG. 4, it is a schematic diagram of the operation of the loop heat pipe structure of the present invention. As shown in the figure, the loop heat pipe structure 1 of the present invention mainly contacts the heat source 3 through the evaporation chamber 11 side (thermal contact surface), and the evaporation The capillary 11 is correspondingly disposed inside the cavity 11 corresponding to the heat source 3, and the capillary structure 114 contains a working fluid 22 in a liquid state. When the evaporation cavity 11 contacts the heat source 3 and absorbs heat generated by the heat source 3 When the inner capillary structure 114 is heated, the liquid working fluid 22 contained therein is vaporized and vaporized. The vapor channel 1141 provided by the capillary structure 114 diffuses away from the capillary structure 114, and is directly connected by one end of the vapor channel 1141. The outlet 111 of the evaporation chamber 11 is directly diffused from the outlet 111 to the evaporation chamber 11. The first end 121 of the tube 12 is connected to the outlet 111 to make the steam. The working fluid 21 enters the tubular body 12, and the vaporous working fluid 21 is disposed (sleeve) through the tubular body 12 with the condensing unit 13 for cooling and condensation, and then the second end 122 of the tubular body 12 is The inlet 11 of the evaporation chamber 11 2 connecting the liquid working fluid 22 to the evaporation chamber 11, the pressure difference and capillary phenomenon of the liquid working fluid 22 in addition to its own vapor-liquid phenomenon can be guided back to the capillary structure In the middle and outer 114, the inlet 112 is correspondingly disposed above the capillary structure 114 to increase the direct flow into the capillary structure 114 by gravity to continue the vapor-liquid circulation.

Any heat dissipating component (not shown) having a lifting condensation effect may be connected to the outside of the pipe body 12 to further improve the efficiency of condensation.

The present invention mainly changes the correspondence between the outlet 111 of the evaporation chamber 11 and the inlet 112 and the capillary structure 114. When the liquid working fluid 22 is returned to the evaporation chamber 11 mainly through the first introduction of the capillary structure 114 used as the vapor core, The reflowed liquid working fluid 22 is disposed directly below the inlet 112 due to the capillary structure 114, so that it is first stored in the capillary structure 114 after reflow, and the excess liquid working fluid 22 is stored in the compensation chamber after the capillary structure 114 has saturated water content. In 115, the lack of dry burning of the working fluid 2 caused by the horizontal displacement of the conventional flat evaporator caused by the horizontal distance from the evaporation surface is solved.

Claims (10)

A loop heat pipe structure comprises: an evaporation chamber having an outlet and an inlet and an accommodating space, the accommodating space having a capillary structure and a compensation chamber and at least one vapor passage, the vapor passage end Communicating with the outlet, the capillary structure is disposed between the inlet and the outlet and adjacent to the inlet, the compensation cavity is horizontally corresponding to the capillary structure, the compensation cavity is away from the outlet; a tube body having a first end and a second end are respectively connected to the outlet and the inlet of the evaporation chamber; a working fluid is filled in the evaporation chamber or the tube body; and a condensing unit is disposed in the first body of the tube body, Between the two ends. The loop heat pipe structure according to claim 1, wherein the vapor channel is selected from the wall surface of the evaporation chamber relative to the capillary structure or at a side of the capillary structure opposite to the evaporation chamber. First, one end of the vapor channel is correspondingly connected to the outlet. The loop heat pipe structure according to claim 1, wherein the working fluid system has a vapor state and a liquid state, and the vapor working fluid and the liquid working fluid circulate inside the loop heat pipe structure as a whole. . The loop heat pipe structure according to claim 1, wherein the evaporation chamber further has a casing and a bottom plate and correspondingly forms the evaporation cavity. The loop heat pipe structure of claim 1, wherein the outlet and the inlet of the evaporation chamber are optionally disposed on the same side or different sides of the evaporation chamber, and the outlet and the inlet may be Same or different levels. The loop heat pipe structure according to claim 1, wherein the outlet and the inlet are disposed on different sides of the evaporation cavity, and the second end of the pipe body enters the accommodating space by the inlet of the evaporation cavity And extending to a side away from the compensation chamber, the inlet position being higher than the outlet. The loop heat pipe structure according to claim 4, wherein the evaporation cavity contacts a heat source and absorbs heat generated by the heat source, and the capillary structure is heated to generate vaporization vaporization of the liquid working fluid contained therein. The vapor passage provided by the capillary structure diffuses away from the capillary structure, and since one end of the vapor passage is directly connected to the outlet of the evaporation chamber, the vaporous working fluid is directly diffused from the outlet to the outside of the evaporation chamber, and is passed through the tube body. The first end is connected to the outlet, and the working fluid of the vapor state enters the tubular body, and the working fluid of the vapor state is cooled and condensed into a liquid working fluid through a condensing unit of the outer casing of the tubular body, and then the tubular working fluid is The second end of the body is connected to the inlet of the evaporation chamber to direct the liquid working fluid back into the evaporation chamber, and since the second end extends into the evaporation chamber and directly extends above the capillary structure, The liquid working fluid is directly directed to the capillary structure, and after the capillary structure is saturated with the liquid working fluid, the excess liquid working fluid is directed to the compensation. The cavity is stored. The loop heat pipe structure according to claim 1, wherein the evaporation chamber system is a flat plate evaporation chamber, and the compensation chamber is horizontally disposed corresponding to the capillary structure. The loop heat pipe structure according to claim 1, wherein one end of the liquid passage is connected to the inlet, the liquid passage is disposed on one side of the capillary structure, and the liquid passage system and the steam passage are respectively corresponding to each other. On the upper and lower sides of the capillary structure. The loop heat pipe structure according to claim 1, wherein the condensing unit is configured by any one of a plurality of heat radiating fins or a plurality of cooling tubes.