A flexible circulation heat dissipation system and a laser projector having the same

Abstract

The present invention relates to a flexible circulation heat dissipation system, including an evaporator, a cold radiator and a heat transfer unit. The cold radiator has a gas phase inlet at one end and a liquid phase outlet at the other end. The cold radiator has a cavity inside. A capillary unit is provided in the cavity inside the cold radiator near the liquid phase outlet. The heat transfer unit has a built-in fluid circulation channel, and both ends are provided with fluid circulation ports connected to the internal fluid circulation channel. The fluid circulation ports at both ends of the heat transfer unit are connected to the liquid phase inlet of the evaporator and the liquid phase outlet of the cold radiator through flexible heat pipes, respectively. The gas phase outlet of the evaporator is connected to the gas phase inlet of the cold radiator through a flexible heat pipe. The capillary unit isolates the inner cavity of the cold radiator, and is used to absorb the liquid phase after the gas phase entering the cold radiator is condensed and converted, and output it through the liquid phase outlet. Advantages: The whole system has a good heat dissipation effect. The two components in the system are connected by a flexible heat pipe, which is convenient for the arrangement of each component in different directions. It has strong compatibility when installed and used in electrical components.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of electronic products, and in particular to a flexible circulation heat dissipation system and a laser projector having the same. Background Art

[0002] In the field of electronic product heat dissipation, copper-water heat pipes are mainly used as efficient heat transfer components, and their internal capillary structure processes include grooves, wire meshes, and copper powder sintering. Ordinary copper-water heat pipes can be bent and flattened, but they are usually rigid structures and are not suitable for deformable or moving parts, so their applications are limited.

[0003] Take the laser projector as an example. This product is a projection product that uses laser beams to transmit images. Its core components include laser projector optics, lenses, DLP boards, speakers, etc. There are red, green, and blue lasers in the laser projector. Among them, laser light sources, DMD processing chips and other components are high-power devices of laser projectors. With the improvement of the brightness and resolution of laser projectors, it is difficult to effectively dissipate the heat generated by these high-heat consumption devices by natural convection. Therefore, general laser projectors mostly use forced air cooling technology with heat pipe radiators and fans. Among them, each high-power component is equipped with a separate heat dissipation module, namely a heat pipe radiator. The heat is transferred from the heat source to the radiator fins via the heat pipe, and the fan provides the air flow required for fin cooling.

[0004] In the existing technical solutions for heat dissipation systems, the radiator of each heat source is designed independently, and the heat pipe uses a traditional copper tube and is bent, flattened and other processes to achieve special heat transfer path requirements. Since the traditional heat pipe is a rigid structure, each heat source must have an independent radiator and its heat transfer structure designed. In addition, due to the difference in power between heat sources and the spatial distance between radiators, the space inside the whole machine used for heat dissipation is wasted. Low-power heat sources do not require a large radiator volume, and there is a large amount of unused space around the radiator. Due to space limitations, the radiator volume of high-power heat sources is insufficient, and other internal space cannot be used to extend the heat dissipation area. At the same time, due to the influence of the rigid structure of the heat pipe, the radiator has poor compatibility and cannot meet the needs of multiple types of installation application scenarios. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a flexible circulation heat dissipation system and a laser projector having the same, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] A flexible circulation heat dissipation system comprises an evaporator, a cold radiator and a heat transfer unit. The cold radiator has a gas phase inlet at one end and a liquid phase outlet at the other end. The cold radiator has a cavity inside. A capillary unit is arranged in the cavity inside the cold radiator near the liquid phase outlet. The heat transfer unit has a built-in fluid circulation channel and has fluid circulation ports at both ends respectively connected to the fluid circulation channel inside the heat transfer unit. The fluid circulation ports at both ends of the heat transfer unit are respectively connected to the liquid phase inlet of the evaporator and the liquid phase outlet of the cold radiator through flexible heat pipes. The gas phase outlet of the evaporator is connected to the gas phase inlet of the cold radiator through a flexible heat pipe. The capillary unit isolates the inner cavity of the cold radiator and is used to absorb the liquid phase after condensation and conversion of the gas phase entering the cold radiator and output it through the liquid phase outlet.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, according to the above-mentioned flexible circulation heat dissipation system, it is characterized in that: the above-mentioned radiator is a flat rectangular cavity structure, and its surface is covered with heat dissipation fins.

[0010] Furthermore, the capillary unit comprises a plurality of capillary structures arranged along the length direction of the radiator and spaced apart in a row, and a cavity extending along the length direction of the radiator is formed between two adjacent capillary structures and the inner wall of the radiator, and the cavity is sealed at one end close to the liquid phase outlet, and a ventilation pore is provided inside the capillary structure for absorbing the liquid phase and outputting it through the liquid phase outlet.

[0011] Furthermore, the above-mentioned heat transfer units are provided in plurality, and are connected in series with each other through the above-mentioned flexible heat pipe via the fluid circulation port.

[0012] Furthermore, the flexible heat pipe is a flexible metal bellows lined with a wire mesh, and the wire mesh is a stainless steel wire mesh or a copper wire mesh.

[0013] Furthermore, the heat conduction unit is a flat metal heat conduction plate.

[0014] The beneficial effects are: the whole system has good heat dissipation effect, two components in the system are connected by a flexible heat pipe, which facilitates the arrangement of various components in different directions and has strong compatibility when installed and used in electrical components.

[0015] A laser projector is also provided, comprising a flexible circulation heat dissipation system, wherein a plurality of heat conduction units of the flexible circulation heat dissipation system are respectively attached to the side surfaces of high-power components inside the laser projector.

[0016] Furthermore, the horizontal height of the radiator and its liquid phase outlet inside the laser projector is higher than the horizontal height of the evaporator and its liquid phase inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the flexible circulation heat dissipation system of the present invention applied in a laser projector;

[0018] Figure 2 It is a schematic structural diagram of another embodiment of the flexible circulation heat dissipation system of the present invention applied in a laser projector;

[0019] Figure 3 for Figure 2 A side view of the structure in FIG.

[0020] Figure 4 It is a cross-sectional view of the cold row in the flexible circulation heat dissipation system of the present invention;

[0021] Figure 5 The cross section of the capillary structure in the flexible circulation heat dissipation system of the present invention is Figure 1 ;

[0022] Figure 6 The cross section of the capillary structure in the flexible circulation heat dissipation system of the present invention is Figure 2 ;

[0023] Figure 7 The cross section of the capillary structure in the flexible circulation heat dissipation system of the present invention is Figure 3 ;

[0024] Figure 8 The cross section of the capillary structure in the flexible circulation heat dissipation system of the present invention is Figure 4 .

[0025] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0026] 1. Evaporator; 2. Radiator; 3. Heat transfer unit; 4. Flexible heat pipe; 5. Heat dissipation fin; 21. Capillary structure; 211. Cavity. DETAILED DESCRIPTION

[0027] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0028] Embodiment 1

[0029] like Figures 1 to 3As shown, the flexible circulation heat dissipation system of this embodiment includes an evaporator 1, a cold row 2 and a heat transfer unit 3. The cold row 2 has a gas phase inlet at one end and a liquid phase outlet at the other end, and has a cavity inside. A capillary unit is provided in the internal cavity of the cold row 2 near the liquid phase outlet. The heat transfer unit 3 has a built-in fluid circulation channel, and has fluid circulation ports connected to the internal fluid circulation channel at both ends. The fluid circulation ports at both ends of the heat transfer unit 3 are connected to the liquid phase inlet of the evaporator 1 and the liquid phase outlet of the cold row 2 through flexible heat pipes 4, respectively. The gas phase outlet of the evaporator 1 is connected to the gas phase inlet of the cold row 2 through flexible heat pipes 4. The capillary unit isolates the inner cavity of the cold row 2, and is used to absorb the liquid phase after condensation and conversion of the gas phase entering the cold row 2, and output it through the liquid phase outlet.

[0030] When in use, the heat conducting unit 3 is attached to the side surface (heat dissipation surface) of the high-power component in the electronic product, and the capillary unit transports the condensed liquid phase in the cold row 2 to be output through the liquid phase outlet, and passes through the fluid circulation channel in the heat conducting unit 3, and takes away the heat generated by the operation of the high-power device conducted by the heat conducting unit 3, and then enters the evaporator 1 to evaporate and produce a gas phase, and the gas phase then enters the cold row 2 to condense into a liquid phase, and then circulates through the capillary unit. The whole process adopts the loop heat pipe technology to connect the heat source and the radiator (cold row 2) to realize heat transfer, with efficient heat transfer, strong circulation driving force and high Qmax, and can more effectively utilize the space of each part to increase the heat dissipation volume and extend the heat dissipation area. In addition, the capillary unit is used inside the cold row 2 to improve the fluid circulation driving force.

[0031] Specifically, the radiator 2 is a flat rectangular cavity structure, the surface of which is covered with heat dissipation fins 5, and the heat dissipation effect is good.

[0032] As a preferred embodiment, Figure 4 As shown, the capillary unit includes a plurality of capillary structures 21 arranged along the length direction of the radiator 2 and spaced apart in a row, and a cavity 211 extending along the length direction of the radiator 2 is formed between two adjacent capillary structures 21 and the inner wall of the radiator 2, and the cavity 211 is sealed at one end close to the liquid phase outlet, and a ventilation pore is provided inside the capillary structure 21 for absorbing the liquid phase and outputting it through the liquid phase outlet.

[0033] In this embodiment, the radiator 2 uses a parallel capillary structure 21 inside, which can increase the contact area of ​​the capillary structure 21, improve the fluid circulation driving force, and enhance the heat dissipation effect and efficiency.

[0034] Preferably, the cross-sectional shape of each capillary structure 21 in the capillary unit can be designed to be consistent, or can be set to different shapes. Specifically, the following four structural shapes are listed:

[0035] 1) If Figure 5 As shown, the cross section of the capillary structure is square;

[0036] 2) If Figure 6 As mentioned above, the cross section of the capillary structure is a square grid;

[0037] 3) If Figure 7 As shown, the cross section of the capillary structure is circular;

[0038] 4) If Figure 8 As shown, the cross section of the capillary structure is circular, and a plurality of ventilation channels are provided therein.

[0039] That is to say, the cross-section of the capillary structure can be circular, polygonal or porous (including the above four structural forms), which can effectively increase the surface contact area of ​​the capillary structure, thereby achieving a greater internal circulation driving force.

[0040] Preferably, the above-mentioned heat transfer units 3 are provided in plurality, and are connected in series with each other through the above-mentioned flexible heat pipes 4 via fluid circulation ports.

[0041] In this solution, the number of heat transfer units 3 depends on the number of high-power devices in the electronic product. In this embodiment, the laser projector has three high-power devices (respectively, Figure 1 a, b, c in the figure, and b and c are laser light sources), ensuring that each high-power device is equipped with a heat conduction unit 3 to ensure a better heat dissipation effect.

[0042] Preferably, the flexible heat pipe 4 is a flexible metal bellows lined with a wire mesh, and the wire mesh is a stainless steel wire mesh or a copper wire mesh.

[0043] In this solution, the wire mesh structure inside the flexible heat pipe 4 can form a capillary structure inside the flexible heat pipe, supplementing the internal circulation driving force when necessary. At the same time, the flexible metal bellows made of stainless steel and other materials have excellent sealing performance and fatigue resistance against repeated bending, making the structural installation adaptability of the entire heat dissipation system better and more compatible with multiple heat sources. The flexible connection part used as the heat pipe can not only meet the heat dissipation requirements, but also meet the requirements of installation adaptability and compatibility.

[0044] It is necessary to add that: Figures 1 to 3 As shown, Figures 1 to 3 All of them are top-view structural schematic diagrams of the cross-section of the laser projector, where Figure 1 The medium and high power devices are installed vertically (from left to right in the figure, the high power device and two laser light sources), and the heat conduction unit 3 is attached to the side of each high power device; Figure 2 and 3The medium and high power devices are arranged vertically as well as horizontally (from left to right in the figure, there are high power devices and two laser light sources, and the middle laser light source is arranged horizontally); because two adjacent heat conduction units 3 are connected by a flexible heat pipe 4, therefore, based on the better bending performance of the flexible heat pipe 4, it can dissipate heat for multiple high power devices in different installation positions and angles, that is, it has strong compatibility.

[0045] Optimally, the heat conducting unit 3 is a flat metal heat conducting plate.

[0046] In this solution, the heat conduction unit 3 has a simple structural design, a large contact area with the high-power device, high heat conduction efficiency and good effect.

[0047] Embodiment 2

[0048] like Figures 1 to 3 As shown, a laser projector of this embodiment includes the flexible circulation heat dissipation system of the first embodiment, and a plurality of heat conduction units 3 of the flexible circulation heat dissipation system are respectively attached to the side surfaces of the high-power components inside the laser projector.

[0049] In the entire embodiment, the internal space of the whole machine is used to maximize the volume of the radiator 2, thereby expanding the heat dissipation area, so that the space near the low-power heat source is fully utilized, and the heat dissipation area of ​​the hot spot heat source is more sufficient, achieving the effect of peak shaving and valley filling.

[0050] Optimally, the level of the cold row 2 and its liquid phase outlet inside the laser projector is higher than the level of the evaporator 1 and its liquid phase inlet.

[0051] In this scheme, through reasonable arrangement, the cooling end of the entire flexible circulation heat dissipation system is positioned higher than the evaporation end, and gravity is used for self-circulation of the fluid, which can further enhance the circulation flow.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible circulation heat dissipation system, characterized in that: The invention comprises an evaporator (1), a cold row (2) and a heat transfer unit (3). The cold row (2) has a gas phase inlet at one end and a liquid phase outlet at the other end. The cold row (2) has a cavity inside. A capillary unit is provided in the cavity inside the cold row (2) near the liquid phase outlet. The heat transfer unit (3) has a built-in fluid circulation channel and has fluid circulation ports at both ends thereof connected to the fluid circulation channel inside the heat transfer unit (3). The fluid circulation ports at both ends of the heat transfer unit (3) are connected to the liquid phase inlet of the evaporator (1) and the liquid phase outlet of the cold row (2) through flexible heat pipes (4). The gas phase outlet of the evaporator (1) is connected to the gas phase inlet of the cold row (2) through the flexible heat pipe (4). The capillary unit isolates the inner cavity of the cold row (2) and is used to absorb the gas. The liquid phase after condensation of the gas phase entering the radiator (2) is collected and outputted through the liquid phase outlet. The capillary unit comprises a plurality of capillary structures (21) arranged along the length direction of the radiator (2) and arranged in a row at intervals. Two adjacent capillary structures (21) and the inner wall of the radiator (2) together form a cavity (211) extending along the length direction of the radiator (2). The cavity (211) is sealed at one end close to the liquid phase outlet. The capillary structure (21) is provided with a ventilation hole inside, which is used to absorb the liquid phase and output it through the liquid phase outlet. The flexible heat pipe (4) is a flexible metal bellows lined with a wire mesh, and the wire mesh is a stainless steel wire mesh or a copper wire mesh. The heat conduction unit (3) is a flat metal heat conduction plate.

2. A flexible circulation heat dissipation system according to claim 1, characterized in that: The radiator (2) is a flat rectangular cavity structure, the surface of which is covered with heat dissipation fins (5).

3. A flexible circulation heat dissipation system according to claim 1 or 2, characterized in that: The heat conduction units (3) are provided in plurality and are connected in series via the flexible heat pipe (4) through a fluid circulation port.

4. A laser projector, characterized in that: It comprises the flexible circulation heat dissipation system as claimed in claim 3, wherein a plurality of heat conduction units (3) of the flexible circulation heat dissipation system are respectively attached to the side surfaces of high-power components inside the laser projector.

5. A laser projector according to claim 4, characterized in that: The horizontal height of the cold row (2) and its liquid phase outlet inside the laser projector is higher than the horizontal height of the evaporator (1) and its liquid phase inlet.

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