CN217770736U - Loop heat pipe structure and electronic equipment - Google Patents

Abstract

The utility model discloses a loop heat pipe structure and an electronic device, wherein the loop heat pipe structure comprises an evaporation unit, a steam pipeline, a condensation unit and a liquid pipeline on which a piezoelectric driving unit is arranged; the piezoelectric driving unit comprises a shell internally provided with a partition, and the partition divides an inner cavity of the shell into a liquid inlet chamber, an installation chamber and a liquid outlet chamber; the installation chamber is internally provided with a piezoelectric vibrator structure which divides the installation chamber into a first cavity and a second cavity; the shell is provided with an inlet communicated with the liquid inlet chamber and an outlet communicated with the liquid outlet chamber; the partition is provided with a liquid inlet and a liquid outlet, the liquid inlet is provided with a first one-way valve structure which only allows liquid to enter the second cavity from the liquid inlet chamber, and the liquid outlet is provided with a second one-way valve structure which only allows liquid to enter the liquid outlet chamber from the second cavity. The electronic device includes a loop heat pipe structure. The utility model discloses increased the liquid drive power except that capillary force, improved the radiating efficiency.

Description

Loop heat pipe structure and electronic equipment

Technical Field

The utility model belongs to the technical field of the heat dissipation, especially, relate to a loop heat pipe structure and electronic equipment.

Background

At present, the circulating flow of liquid in the traditional loop heat pipe structure is mainly driven by the capillary force provided by a capillary wick in an evaporation unit; when the liquid loop is too long, the height difference is too large or the design size of the capillary core is limited, the heat dissipation efficiency is seriously influenced only by the fact that the capillary force is not enough to drive the normal circulation flow of the liquid; how to increase the liquid driving force of the loop heat pipe structure and improve the heat dissipation efficiency is a subject that needs to be researched urgently at present.

SUMMERY OF THE UTILITY MODEL

At least one department that exists is not enough among the above-mentioned prior art in the aim at overcoming, the utility model provides a loop heat pipe structure and electronic equipment has increased the liquid drive power except that capillary force, has improved the radiating efficiency.

In order to solve the problems in the prior art, an embodiment of the present invention provides a loop heat pipe structure, which includes an evaporation unit, a vapor pipeline, a condensation unit, and a liquid pipeline; the liquid pipeline is provided with a piezoelectric driving unit for providing driving force for liquid flow; the piezoelectric driving unit comprises a shell internally provided with a partition, and the partition divides an inner cavity of the shell into a liquid inlet chamber, an installation chamber and a liquid outlet chamber which are mutually independent; the installation chamber is internally provided with a piezoelectric vibrator structure, and the piezoelectric vibrator structure divides the installation chamber into a first cavity and a second cavity which are mutually independent; the shell is provided with an inlet communicated with the liquid inlet chamber and an outlet communicated with the liquid outlet chamber, and the inlet and the outlet are connected in series in the liquid pipeline;

a liquid inlet is arranged on the partition, and a first one-way valve structure which only allows liquid to enter the second cavity from the liquid inlet chamber is arranged on the liquid inlet; a liquid outlet is also formed in the partition, and a second one-way valve structure which only allows liquid to enter the liquid outlet chamber from the second cavity is arranged on the liquid outlet; the piezoelectric vibrator structure is used for adjusting the volume of the second cavity to generate pressure difference so as to drive liquid to enter the liquid outlet chamber from the liquid inlet chamber and the second cavity in sequence.

Further, the partition is a T-shaped partition; the transverse part of the T-shaped partition and the top and the side part of the shell jointly enclose the mounting chamber; the inner cavity of the shell below the mounting chamber is divided into the liquid inlet chamber and the liquid outlet chamber by the vertical part of the T-shaped partition;

the liquid inlet is arranged on the transverse part of the T-shaped partition corresponding to the liquid inlet chamber, and the liquid outlet is arranged on the transverse part of the T-shaped partition corresponding to the liquid outlet chamber.

Further, the piezoelectric vibrator structure comprises a vibrating diaphragm and a piezoelectric vibrator arranged on the vibrating diaphragm, and the edge part of the vibrating diaphragm is fixedly connected with the shell; the piezoelectric vibrator is used for driving the vibrating diaphragm to vibrate and changing the volume of the second cavity so as to generate pressure difference, and then driving liquid to enter the liquid outlet chamber from the liquid inlet chamber through the second cavity.

Further, the evaporation unit comprises a shell and a capillary core arranged in the shell, and the capillary core divides an inner cavity of the shell into a liquid compensation cavity and a steam cavity; the shell is provided with a liquid inlet port used for communicating the liquid compensation cavity with the liquid pipeline and a steam port used for communicating the steam cavity with the steam pipeline.

Further, a liquid return port communicated with the liquid compensation cavity is formed in the shell; the loop heat pipe structure further comprises a liquid bypass, one end of the liquid bypass is communicated with the liquid return port, and the other end of the liquid bypass is intersected with the liquid pipeline on the upstream of the piezoelectric driving unit.

Further, the capillary core includes the body, the bottom interval of body is provided with a plurality of extensions, the extension with the inner wall butt of shell, just the extension will steam cavity separates for a plurality of steam channel.

Furthermore, the evaporation unit comprises a cover shell and a boiling heat exchange bottom plate, the cover shell and the boiling heat exchange bottom plate enclose a sealed boiling heat exchange cavity, and a plurality of cylindrical protrusions for accelerating boiling heat exchange are arranged on the inner surface of the boiling heat exchange bottom plate at intervals;

the shell is provided with a first port for communicating the boiling heat exchange cavity with the liquid pipeline and a second port for communicating the boiling heat exchange cavity with the steam pipeline; the second port is higher than the first port.

Further, a gas-permeable membrane is arranged in the boiling heat exchange cavity, and the gas-permeable membrane divides the boiling heat exchange cavity into a liquid cavity and a gas collection cavity; the first port is communicated with the liquid cavity, and the second port is communicated with the gas collection cavity.

Furthermore, a first baffle and a second baffle are arranged in the boiling heat exchange cavity at intervals, and liquid circulation gaps are reserved between the first baffle and the boiling heat exchange bottom plate and between the second baffle and the boiling heat exchange bottom plate; a breathable film is arranged between the first baffle and the second baffle; the second port is arranged on the housing above the breathable film, the first port is arranged on the housing on the side, away from the breathable film, of the first baffle, and a liquid return port is arranged on the housing on the side, away from the breathable film, of the second baffle; or an annular retaining wall structure is arranged in the boiling heat exchange cavity, a liquid circulation gap is reserved between the top end of the annular retaining wall structure and the housing, and between the bottom end of the annular retaining wall structure and the boiling heat exchange bottom plate, and a breathable film is arranged in the annular retaining wall structure; the second port is arranged on the housing above the air-permeable membrane, the first port is arranged on the housing on one side of the annular retaining wall structure, and the liquid return port is arranged on the housing on the other side of the annular retaining wall structure;

the loop heat pipe structure further comprises a liquid bypass, one end of the liquid bypass is communicated with the liquid return port, and the other end of the liquid bypass is intersected with the liquid pipeline on the upstream of the piezoelectric driving unit.

Further, a check valve structure is arranged on the liquid pipeline at the upstream of the junction of the liquid bypass and the liquid pipeline.

The embodiment of the utility model also provides an electronic device, which comprises a device main body and a heating device arranged in the device main body; the loop heat pipe structure is also included; the loop heat pipe structure is arranged in the equipment main body, and the evaporation unit corresponds to the heating device.

Since the technical scheme is used, the utility model discloses the beneficial effect who gains as follows:

the loop heat pipe structure in the utility model comprises an evaporation unit, a steam pipeline, a condensation unit and a liquid pipeline; the liquid pipeline is provided with a piezoelectric driving unit for providing driving force for liquid flow; the piezoelectric driving unit comprises a shell internally provided with a partition, and the partition divides an inner cavity of the shell into a liquid inlet chamber, an installation chamber and a liquid outlet chamber which are mutually independent; the installation chamber is internally provided with a piezoelectric vibrator structure, and the piezoelectric vibrator structure divides the installation chamber into a first cavity and a second cavity which are mutually independent; the shell is provided with an inlet communicated with the liquid inlet chamber and an outlet communicated with the liquid outlet chamber, and the inlet and the outlet are connected in series in a liquid pipeline; a liquid inlet is arranged on the partition, and a first one-way valve structure which only allows liquid to enter the second cavity from the liquid inlet chamber is arranged on the liquid inlet; a liquid outlet is also arranged on the partition, and a second one-way valve structure which only allows liquid to enter the liquid outlet chamber from the second cavity is arranged on the liquid outlet; the piezoelectric vibrator structure is used for adjusting the volume of the second cavity to generate pressure difference so as to drive liquid to enter the liquid outlet chamber from the liquid inlet chamber and the second cavity in sequence. The electronic device includes a loop heat pipe structure.

When the piezoelectric vibrator structure vibrates upwards, the volume of the second cavity is increased, the internal pressure intensity of the second cavity is reduced (negative pressure is formed), the pressure intensities of the liquid inlet chamber and the liquid outlet chamber are greater than the pressure intensity of the second cavity, the liquid inlet is opened by the first one-way valve structure, and the liquid outlet is closed by the second one-way valve structure; the liquid enters the second cavity from the liquid inlet chamber and the liquid inlet. When the piezoelectric vibrator structure is downward, the volume of the second cavity is reduced, the internal pressure of the second cavity is increased, the pressures of the liquid inlet chamber and the liquid outlet chamber are smaller than the pressure of the second cavity, the liquid outlet is opened by the second one-way valve structure, and the liquid inlet is closed by the first one-way valve structure; liquid enters the liquid outlet chamber from the second cavity and the liquid outlet and enters the evaporation unit by virtue of the liquid pipeline to participate in loop heat dissipation circulation.

The utility model utilizes the piezoelectric vibrator structure to adjust the volume of the second cavity to form pressure difference, further drives the liquid to rapidly enter the second cavity from the liquid inlet chamber and then enter the liquid outlet chamber from the second cavity, and supplements liquid working medium for the evaporation unit; that is, the liquid driving force other than capillary force is increased by the piezoelectric vibrator structure, and the heat dissipation efficiency is improved.

Drawings

FIG. 1 is a cross-sectional view of a loop heat pipe structure according to a first embodiment of the present invention;

FIG. 2 is an enlarged view of the structure of the piezoelectric drive unit of FIG. 1;

FIG. 3 is a sectional view of the vaporization unit of FIG. 1 from another perspective;

FIG. 4 is a cross-sectional view of a second embodiment of the loop heat pipe structure of the present invention;

FIG. 5 is a cross-sectional view of a third embodiment of the loop heat pipe structure of the present invention;

FIG. 6 is a cross-sectional view of a fourth embodiment of the loop heat pipe structure of the present invention;

FIG. 7 is a partial cross-sectional view of a fifth embodiment of the loop heat pipe structure of the present invention;

in the figure: 1-a first evaporation unit, 11-a shell, 111-a liquid compensation cavity, 112-a vapor channel, 12-a capillary core, 121-a body, 122-an extension part, 2-a vapor pipeline, 3-a condensation unit, 4-a liquid pipeline, and 5-a piezoelectric driving unit; 51-shell, 511-inlet, 512-outlet, 52-T-shaped partition, 521-liquid inlet, 522-first one-way valve structure, 523-liquid outlet, 524-second one-way valve structure, 53-liquid inlet chamber, 54-installation chamber, 541-first cavity, 542-second cavity, 55-liquid outlet chamber, 56-piezoelectric vibrator structure, 561-vibrating diaphragm, 562-piezoelectric vibrator, 6-first liquid bypass, 7-second evaporation unit, 71-housing, 711-liquid cavity, 712-gas collection cavity, 72-boiling heat exchange bottom plate, 73-cylindrical protrusion, 74-first gas-permeable membrane, 75-first baffle, 76-second baffle, 77-second gas-permeable membrane, 8-second liquid bypass and 9-check valve structure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The first embodiment is as follows:

as shown in fig. 1 to fig. 3, the present embodiment discloses a loop heat pipe structure, which includes an evaporation unit (for vaporizing liquid into high-temperature vapor, which is denoted as a first evaporation unit 1), a vapor pipeline 2, a condensation unit 3 (including a package shell and a serpentine cooling pipe), and a liquid pipeline 4; the liquid pipeline 4 is provided with a piezoelectric driving unit 5 (which can be understood as a pump unit without motor drive) for providing driving force for liquid flow; the piezoelectric driving unit 5 comprises a shell 51 with a partition inside, and the partition divides an inner cavity of the shell 51 into a liquid inlet chamber 53, a mounting chamber 54 and a liquid outlet chamber 55 which are mutually independent; the piezoelectric vibrator structure 56 is arranged in the mounting chamber 54, and the piezoelectric vibrator structure 56 divides the mounting chamber 54 into a first cavity 541 and a second cavity 542 which are independent of each other; the shell 51 is provided with an inlet 511 communicated with the liquid inlet chamber 53 and an outlet 512 communicated with the liquid outlet chamber 55, and the inlet 511 and the outlet 512 are connected in series in the liquid pipeline 4; the partition is provided with a liquid inlet 521 for communicating the liquid inlet chamber 53 with the second cavity 542, and the liquid inlet 521 is provided with a first one-way valve structure 522 only allowing liquid to enter the second cavity 542 from the liquid inlet chamber 53; a liquid outlet 523 used for communicating the second cavity 542 with the liquid outlet chamber 55 is further arranged on the partition, and a second one-way valve structure 524 only allowing liquid to enter the liquid outlet chamber 55 from the second cavity 542 is arranged on the liquid outlet 523; the piezoelectric vibrator structure 56 is used for adjusting the volume of the second cavity 542 to generate a pressure difference, so as to drive the liquid to enter the liquid outlet chamber 55 from the liquid inlet chamber 53 and the second cavity 542 in sequence.

In this embodiment, the partition is a T-shaped partition 52; the transverse part of the T-shaped partition 52 and the top and the side of the shell 51 jointly enclose an installation chamber 54; the inner cavity of the shell 51 below the mounting chamber 54 is divided into a liquid inlet chamber 53 and a liquid outlet chamber 55 by the vertical part of the T-shaped partition 52; a liquid inlet 521 is provided on a lateral portion of the T-shaped partition 52 corresponding to the liquid inlet chamber 53, and a liquid outlet 523 is provided on a lateral portion of the T-shaped partition 52 corresponding to the liquid outlet chamber 55. In this embodiment, the first check valve structure 522 is a first valve plate, and a corner or one end of the first valve plate is connected to a side of the T-shaped partition 52 facing the piezoelectric vibrator structure 56; the second check valve structure 524 is a second valve plate, and a corner or one end of the second valve plate is connected to a side of the T-shaped partition 52 away from the piezoelectric vibrator structure 56; when the volume of the second chamber 542 is increased and the pressure is decreased, a pressure difference is formed between the liquid inlet chamber 53 and the liquid outlet chamber 55, and under the action of the pressure difference, the liquid in the liquid inlet chamber 53 forces the first valve plate to open the liquid inlet 521, and simultaneously the suction force generated by the increase of the volume of the second chamber 542 causes the second valve plate to tightly close the liquid outlet 523. When the volume of the second chamber 542 is decreased and the pressure is increased, the liquid in the second chamber 542 forces the first valve plate to close the liquid inlet 521 and forces the second valve plate to open the liquid outlet 523 under the action of the pressure difference. In still other embodiments, the first one-way valve structure 522 and the second one-way valve structure 524 are spring valves, diaphragm valves, umbrella valves, cantilever beam valves, etc., so long as one of the first one-way valve structure 522 and the second one-way valve structure 524 is ensured to be open and the other one closed under the action of a pressure differential, and fluid unidirectional control is achieved.

In this embodiment, the piezoelectric vibrator structure 56 includes a diaphragm 561 and a piezoelectric vibrator 562 disposed on the diaphragm 561, and an edge of the diaphragm 561 is fixedly connected to the casing 51; the piezoelectric vibrator 562 is used for driving the diaphragm 561 to vibrate up and down and change the volume of the second cavity 542 to generate a pressure difference, so as to drive the liquid to enter the liquid outlet chamber 55 from the liquid inlet chamber 53 through the second cavity 542. In still other embodiments, the piezoelectric vibrator structure 56 includes only the piezoelectric vibrator 562 (the rim portion is fixedly attached to the case 51). The piezoelectric vibrator 562 is made of a piezoelectric material, and the piezoelectric material is divided into an inorganic piezoelectric material (such as piezoelectric ceramic or piezoelectric crystal) and an organic piezoelectric material (such as polyvinylidene fluoride (PVDF)); the working principle of the composite piezoelectric material is the same as that of the prior art, and the details are not described herein.

In this embodiment, the first evaporation unit 1 has a structure similar to the existing structure, and includes a housing 11 and a capillary wick 12 disposed in the housing 11, where the capillary wick 12 divides an inner cavity of the housing 11 into a liquid compensation cavity 111 and a vapor cavity; the shell 11 is provided with a liquid inlet port for communicating the liquid compensation cavity 111 with the liquid pipeline 4 and a steam port for communicating the steam cavity with the steam pipeline 2. The preferable capillary core 12 includes a body 121, a plurality of extending portions 122 are disposed at intervals at the bottom end of the body 121, the extending portions 122 are abutted against the inner wall of the casing 11, and the extending portions 122 divide the steam cavity into a plurality of steam channels 112. The wick 12 is preferably a sintered nickel wick, a sintered copper wick, or a sintered copper-nickel composite wick. Further preferably, in this embodiment, an L-shaped surrounding plate is arranged in the housing 11, and the L-shaped surrounding plate, the housing 11 and the end of the capillary core 12 together enclose a gas collecting cavity; the vapor channel 112 and the vapor port are both in communication with the vapor collection chamber. The capillary wick 12 draws liquid from the liquid compensation chamber 111, and the liquid on the capillary wick 12 absorbs heat, changes phase, and is converted into vapor, and enters the vapor line 2 through the vapor channel 112 and the vapor port.

In still other embodiments, a pressure feedback element, a temperature feedback element or a flow feedback element is added to the liquid pipeline 4, so as to control the start and stop and the frequency of the piezoelectric vibrator 562, and prevent the pressure of the liquid pipeline 4 from being too high when the evaporation efficiency of the first evaporation unit 1 is reduced.

The embodiment also provides electronic equipment, which comprises an equipment main body and a heating device arranged in the equipment main body; the loop heat pipe structure is also included; the loop heat pipe structure is arranged in the equipment main body, and the first evaporation unit 1 corresponds to the heating device. The method specifically comprises the following steps: the shell 11 below the capillary core 12 is a heat source contact end corresponding to the heat generating device. The electronic device is a head-mounted device.

The specific working process is as follows:

when the piezoelectric vibrator 562 in the piezoelectric vibrator structure 56 drives the diaphragm 561 to vibrate upward, the volume of the second chamber 542 is increased, the internal pressure thereof is decreased (negative pressure), the pressures of the liquid inlet chamber 53 and the liquid outlet chamber 55 are greater than the pressure of the second chamber 542, the liquid entering the liquid inlet chamber 53 through the liquid pipeline 4 forces the first check valve structure 522 to open the liquid inlet 521, and meanwhile, the second check valve structure 524 closes the liquid outlet 523 through the suction force generated by the increase of the volume of the second chamber 542; the liquid enters the second cavity 542 from the liquid inlet chamber 53 and the liquid inlet 521. When the piezoelectric vibrator structure 56 faces downward, the volume of the second cavity 542 is reduced, the pressure intensity in the second cavity 542 is increased, the pressure intensities of the liquid inlet chamber 53 and the liquid outlet chamber 55 are smaller than the pressure intensity of the second cavity 542, the liquid in the second cavity 542 forces the second check valve structure 524 to open the liquid outlet, and the first check valve structure 522 closes the liquid inlet 521; liquid enters the liquid outlet chamber 55 from the second cavity 542 and the liquid outlet 523; the liquid enters the first evaporation unit 1 by virtue of the liquid pipeline 4, the liquid on the capillary core 12 absorbs heat, undergoes phase change, is converted into steam and enters the steam pipeline 2, high-temperature steam in the steam pipeline 2 enters the condensation unit 3, the high-temperature steam after sufficient heat dissipation is converted into liquid and flows into the liquid pipeline 4, and then the liquid enters the liquid inlet chamber 53, so that a loop heat dissipation cycle is completed.

Example two:

this embodiment has substantially the same structure as the first embodiment, except that a liquid bypass is added. Only the differences will be explained in detail below.

As shown in fig. 4, the housing 11 of the first evaporation unit 1 in this embodiment is provided with a liquid return port communicated with the liquid compensation chamber 111; the loop heat pipe structure further comprises a liquid bypass (marked as a first liquid bypass 6), one end of the first liquid bypass 6 is communicated with the liquid return port, and the other end of the first liquid bypass 6 is intersected with the liquid pipeline 4 upstream of the piezoelectric driving unit 5. When the excess liquid is not stored in the liquid compensation chamber 111, the liquid enters the first liquid bypass 6 through the liquid return port and reaches the liquid pipeline 4, and the circulation of the first liquid bypass 6 is completed.

As shown in fig. 7, in order to prevent the liquid from flowing backward to the condensing unit 3, the present embodiment is provided with a check valve structure 9 on the liquid line 4 upstream of the junction of the first liquid bypass 6 and the liquid line 4.

Example three:

the concept of this embodiment is substantially the same as that of the first embodiment, except for the specific structure of the evaporation unit, and only the differences will be described in detail below.

As shown in fig. 5, the evaporation unit in this embodiment is denoted as a second evaporation unit 7, the second evaporation unit 7 belongs to a pool boiling structure, and includes a casing 71 and a boiling heat exchange bottom plate 72, the casing 71 and the boiling heat exchange bottom plate 72 enclose a sealed boiling heat exchange cavity, an inner surface of the boiling heat exchange bottom plate 72 is rough enough to promote boiling heat exchange of liquid, and a plurality of column-shaped protrusions 73 for accelerating boiling heat exchange are further provided at intervals on the inner surface of the boiling heat exchange bottom plate 72 to increase the number of vaporization cores. The shell 71 is provided with a first port for communicating the boiling heat exchange cavity with the liquid pipeline 4 and a second port for communicating the boiling heat exchange cavity with the steam pipeline 2; the second port is higher than the first port, so that the liquid and the high-temperature steam can smoothly enter and exit.

In order to ensure that the high-temperature steam entering the steam pipeline 2 does not contain liquid, in the present embodiment, a gas permeable membrane (a first gas permeable membrane 74, which can be clamped and fixed by a mesh, only allows gas to enter, and does not allow liquid to enter) is preferably arranged in the boiling heat exchange cavity, and the first gas permeable membrane 74 divides the boiling heat exchange cavity into a liquid cavity 711 and a gas collection cavity 712; the first port communicates with the liquid chamber 711 and the second port communicates with the gas collection chamber 712.

The embodiment also provides electronic equipment, which comprises an equipment main body and a heating device arranged in the equipment main body; the loop heat pipe structure is also included; the loop heat pipe structure is arranged in the equipment main body, and the second evaporation unit 7 corresponds to the heating device. The method comprises the following specific steps: the boiling heat exchange bottom plate 72 is a heat source contact end and corresponds to the heating device. The electronic device is a head-mounted device.

Example four:

the concept of this embodiment is substantially the same as that of the second embodiment, except for the specific structure of the evaporation unit, and only the differences will be described in detail below.

As shown in fig. 6, the structure of the evaporation unit in this embodiment is the same as the heat dissipation principle and structure of the second evaporation unit 7 in the third embodiment, and only the differences from the third embodiment will be described below; a first baffle 75 and a second baffle 76 are arranged in the boiling heat exchange cavity of the second evaporation unit 7 at intervals, and liquid circulation gaps are reserved between the first baffle 75 and the boiling heat exchange bottom plate 72 and between the second baffle 76 and the boiling heat exchange bottom plate 72; a gas-permeable membrane (denoted as a second gas-permeable membrane 77) is arranged between the first baffle plate 75 and the second baffle plate 76; a second port is arranged on the housing 71 above the second breathable film 77, a first port is arranged on the housing 71 on the side of the first baffle 75 deviating from the second breathable film 77, and a liquid return port is arranged on the housing 71 on the side of the second baffle 76 deviating from the second breathable film 77. In other embodiments, an annular retaining wall structure is arranged in the boiling heat exchange cavity, the top end of the annular retaining wall structure is fixed with the housing 71, a liquid flow gap is reserved between the bottom end of the annular retaining wall structure and the boiling heat exchange bottom plate 72, and a breathable film is arranged in the annular retaining wall structure; a second port is arranged on the housing 71 above the breathable film, a first port is arranged on the housing 71 on one side of the annular retaining wall structure, and a liquid return port is arranged on the housing 71 on the other side.

The loop heat pipe structure further comprises a liquid bypass (marked as a second liquid bypass 8), one end of the second liquid bypass 8 is communicated with the liquid return port, and the other end of the second liquid bypass is intersected with the liquid pipeline 4 upstream of the piezoelectric driving unit 5. When no excess liquid is stored in the boiling heat exchange cavity below the second gas-permeable membrane 77, the liquid enters the second liquid bypass 8 through the liquid return port and reaches the liquid pipeline 4, and the circulation of the second liquid bypass 8 is completed.

As shown in fig. 7, in order to prevent the liquid from flowing backward to the condensing unit 3, the present embodiment also provides a check valve structure 9 on the liquid line 4 upstream of the junction of the second liquid bypass 8 and the liquid line 4.

The embodiment also provides electronic equipment, which comprises an equipment main body and a heating device arranged in the equipment main body; the loop heat pipe structure is also included; the loop heat pipe structure is arranged in the equipment main body, and the second evaporation unit 7 corresponds to the heating device. The method specifically comprises the following steps: the boiling heat exchange bottom plate 72 is a heat source contact end and corresponds to the heating device. The electronic device is a head-mounted device.

The utility model utilizes the piezoelectric vibrator structure 56 to adjust the volume of the second cavity 542 to form pressure difference, so as to drive liquid to rapidly enter the second cavity 542 from the liquid inlet chamber 53 and then enter the liquid outlet chamber 55 from the second cavity 542, and liquid working media are supplemented for the evaporation unit; that is, the liquid driving force other than the capillary force is increased by the piezoelectric vibrator structure 56, and the heat dissipation efficiency is improved.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (11)

1. A loop heat pipe structure comprises an evaporation unit, a steam pipeline, a condensation unit and a liquid pipeline; the liquid pipeline is provided with a piezoelectric driving unit for providing driving force for liquid flow;

the piezoelectric driving unit comprises a shell internally provided with a partition, and the partition divides an inner cavity of the shell into a liquid inlet chamber, an installation chamber and a liquid outlet chamber which are mutually independent; the piezoelectric vibrator structure divides the mounting chamber into a first cavity and a second cavity which are mutually independent; the shell is provided with an inlet communicated with the liquid inlet chamber and an outlet communicated with the liquid outlet chamber, and the inlet and the outlet are connected in series in the liquid pipeline;

a liquid inlet is arranged on the partition, and a first one-way valve structure which only allows liquid to enter the second cavity from the liquid inlet chamber is arranged on the liquid inlet; a liquid outlet is also formed in the partition, and a second one-way valve structure which only allows liquid to enter the liquid outlet chamber from the second cavity is arranged on the liquid outlet; the piezoelectric vibrator structure is used for adjusting the volume of the second cavity to generate pressure difference so as to drive liquid to enter the liquid outlet chamber from the liquid inlet chamber and the second cavity in sequence.

2. A loop heat pipe structure according to claim 1, wherein the partition is a T-shaped partition; the transverse part of the T-shaped partition and the top and the side part of the shell jointly enclose the mounting chamber; the inner cavity of the shell below the mounting chamber is divided into the liquid inlet chamber and the liquid outlet chamber by the vertical part of the T-shaped partition;

the liquid inlet is arranged on the transverse part of the T-shaped partition corresponding to the liquid inlet chamber, and the liquid outlet is arranged on the transverse part of the T-shaped partition corresponding to the liquid outlet chamber.

3. The loop heat pipe structure of claim 1, wherein the piezoelectric vibrator structure comprises a vibrating diaphragm and a piezoelectric vibrator arranged on the vibrating diaphragm, and the edge part of the vibrating diaphragm is fixedly connected with the shell; the piezoelectric vibrator is used for driving the vibrating diaphragm to vibrate and changing the volume of the second cavity so as to generate pressure difference, and then driving liquid to enter the liquid outlet chamber from the liquid inlet chamber through the second cavity.

4. A loop heat pipe structure according to claim 1, wherein the evaporation unit includes a casing and a capillary wick disposed in the casing, the capillary wick dividing an inner cavity of the casing into a liquid compensation chamber and a vapor chamber; the shell is provided with a liquid inlet port used for communicating the liquid compensation cavity with the liquid pipeline and a steam port used for communicating the steam cavity with the steam pipeline.

5. A loop heat pipe structure according to claim 4, wherein the casing is provided with a liquid return port communicating with the liquid compensation chamber; the loop heat pipe structure further comprises a liquid bypass, one end of the liquid bypass is communicated with the liquid return port, and the other end of the liquid bypass is intersected with the liquid pipeline on the upstream of the piezoelectric driving unit.

6. A loop heat pipe structure according to claim 4 or 5, wherein the capillary wick comprises a body, a plurality of extensions are spaced from a bottom end of the body, the extensions abut against an inner wall of the casing, and the extensions divide the vapor cavity into a plurality of vapor channels.

7. A loop heat pipe structure according to claim 1, wherein the evaporation unit comprises a casing and a boiling heat exchange bottom plate, the casing and the boiling heat exchange bottom plate define a sealed boiling heat exchange cavity, and a plurality of stud-shaped protrusions for accelerating boiling heat exchange are further arranged on the inner surface of the boiling heat exchange bottom plate at intervals;

the shell is provided with a first port for communicating the boiling heat exchange cavity with the liquid pipeline and a second port for communicating the boiling heat exchange cavity with the steam pipeline; the second port is higher than the first port.

8. A loop heat pipe structure according to claim 7 wherein a gas permeable membrane is disposed within the boiling heat exchange chamber, the gas permeable membrane separating the boiling heat exchange chamber into a liquid chamber and a gas collection chamber; the first port is communicated with the liquid cavity, and the second port is communicated with the gas collection cavity.

9. A loop heat pipe structure as claimed in claim 7, wherein a first baffle and a second baffle are arranged in the boiling heat exchange cavity at intervals, and liquid circulation gaps are reserved between the first baffle and the boiling heat exchange bottom plate and between the second baffle and the boiling heat exchange bottom plate; a breathable film is arranged between the first baffle and the second baffle; the second port is arranged on the housing above the breathable film, the first port is arranged on the housing on the side, away from the breathable film, of the first baffle, and the liquid return port is arranged on the housing on the side, away from the breathable film, of the second baffle; or an annular retaining wall structure is arranged in the boiling heat exchange cavity, a liquid circulation gap is reserved between the top end of the annular retaining wall structure and the housing, and between the bottom end of the annular retaining wall structure and the boiling heat exchange bottom plate, and a breathable film is arranged in the annular retaining wall structure; the second port is arranged on the housing above the breathable film, the first port is arranged on the housing on one side of the annular retaining wall structure, and the liquid return port is arranged on the housing on the other side of the annular retaining wall structure;

the loop heat pipe structure further comprises a liquid bypass, one end of the liquid bypass is communicated with the liquid return port, and the other end of the liquid bypass is intersected with the liquid pipeline on the upstream of the piezoelectric driving unit.

10. A loop heat pipe structure according to claim 5 or 9, wherein a check valve structure is provided on the liquid line upstream of the junction of the liquid bypass and the liquid line.

11. An electronic apparatus includes an apparatus main body and a heat generating device provided in the apparatus main body; a loop heat pipe structure according to any one of claims 1 to 10; the loop heat pipe structure is arranged in the equipment main body, and the evaporation unit corresponds to the heating device.

Images