Projection device

Abstract

The utility model provides projection equipment, and relates to the technical field of projection. The vapor chamber is in thermal conduction with the heating element; the vapor chamber comprises a shell, the interior of the shell is provided with a cavity, and in the extending direction of the cavity, one end of the shell is a condensation end, and the other end of the shell is an evaporation end; the liquid absorbing core is located in the cavity and covers at least part of the cavity wall of the cavity; the liquid absorption core is used for transmitting liquid in the cavity, so that part of the liquid flows back to the evaporation end from the condensation end; the backflow piece is located in the cavity, one end of the backflow piece abuts against the liquid absorption core located at the condensation end, and the other end of the backflow piece abuts against the liquid absorption core located at the evaporation end; the backflow piece is used for conveying the liquid in the cavity so that the other part of the liquid can flow back to the evaporation end from the condensation end. According to the projection equipment, the backflow rate of liquid can be increased, and the heat conduction efficiency of the vapor chamber is improved.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to a projection device. Background Art

[0002] As a heat-conducting element, the vapor chamber is commonly used in projection equipment. The liquid absorption core of the vapor chamber is placed in the internal cavity of the vapor chamber. The two end surfaces of the vapor chamber have an evaporation end and a condensation end respectively. At the same time, liquid is placed in the tube cavity.

[0003] During use of the existing heat spreader, the liquid near the evaporation end absorbs heat and evaporates, and the vapor can be transferred to the condensation end, where the vapor releases heat and condenses to form liquid, which then flows back to the evaporation end through the liquid absorption core; this cycle repeats, and the liquid continuously transfers heat from the evaporation end to the condensation end.

[0004] However, when the surface of the vapor chamber is placed vertically, the liquid will be affected by gravity during the reflux process and tend to flow to the bottom of the vapor chamber, resulting in a slower reflux rate of the liquid and reducing the thermal conductivity of the vapor chamber. Utility Model Content

[0005] In view of the above problems, the present application provides a projection device that can increase the reflux rate of liquid and improve the thermal conductivity efficiency of the heat sink.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A first aspect of the present application provides a projection device, comprising:

[0008] Heating element;

[0009] A heat spreader, which is thermally connected to the heating element;

[0010] Vapor Chamber includes:

[0011] A shell, wherein the interior of the shell has a cavity, and along the extension direction of the cavity, one end of the shell is a condensation end, and the other end of the shell is an evaporation end;

[0012] The liquid wick is located in the cavity and covers at least a portion of the cavity wall of the cavity; the liquid wick is used to transfer the liquid in the cavity so that part of the liquid flows back from the condensation end to the evaporation end;

[0013] The reflux member is located in the cavity, one end of which abuts against the liquid wick at the condensation end, and the other end abuts against the liquid wick at the evaporation end; the reflux member is used to transfer the liquid in the cavity so that another part of the liquid flows back from the condensation end to the evaporation end.

[0014] The beneficial effects of the present application are as follows: the reflux component can be used to assist the transmission of liquid and shorten the reflux path of the liquid, so that more liquid can flow back to the evaporation end through the reflux component, while reducing the amount of liquid flowing back through the liquid wick, thereby increasing the reflux rate of the liquid and further increasing the thermal conductivity of the heat spreader; compared to not providing a reflux component in the heat spreader, after the reflux component is provided in the heat pipe, the reflux component can increase the reflux rate of the liquid and the thermal conductivity of the heat spreader regardless of whether the heat spreader is placed vertically or horizontally.

[0015] In a possible implementation, the return member includes a return core and a support member that are connected to each other, one end of the support member extends toward the condensation end, and the other end of the support member extends toward the evaporation end; the support member is located inside the return core.

[0016] In this way, the support member can play a role in supporting the reflux core, ensuring that the reflux core can stably transmit liquid so that the liquid flows from the condensation end to the evaporation end.

[0017] In a possible implementation, the return element has a cavity inside, one end of the cavity extends toward the condensation end, and the other end of the cavity extends toward the evaporation end.

[0018] In this way, the existence of the cavity can improve the transmission efficiency of the reflux component to the steam and ensure the thermal conductivity of the heat sink.

[0019] In a possible implementation, along the circumference of the support member, the return core is arranged around the support member; along the extension direction of the support member, there is a gap between the middle of the support member and the return core, and the gap forms a cavity.

[0020] In this way, the formation of the cavity is facilitated by the mutual cooperation of the support member and the return core.

[0021] In one possible implementation, the reflow core includes a first core layer and a second core layer; the first core layer, the second core layer and the support member are all annular members, the inner wall of the first core layer is connected to the outer wall of the support member, and the outer wall of the second core layer is connected to the inner wall of the support member; the cavity wall is located on the second core layer.

[0022] In this way, the vapor can be quickly transferred from the evaporation end to the condensation end in the cavity, further improving the thermal conductivity of the vapor chamber.

[0023] In a possible implementation, the housing includes a main housing and a protruding housing connected to each other, and the protruding housing protrudes from a side surface of the main housing;

[0024] The cavity includes a first cavity and a second cavity which are interconnected; the first cavity is located in the main shell, and the second cavity is located in the shell; the condensation end is located at one end of the main shell away from the protruding shell, and the evaporation end is located at one end of the protruding shell away from the main shell.

[0025] In this way, when the protruding shell protrudes from one side surface of the main shell, it is convenient for the evaporation end on the protruding shell to abut against the heating element, thereby achieving thermal conduction with the heating element.

[0026] In a possible implementation, one end of the reflux member extends into the second cavity, the end of the reflux member is spaced apart from the cavity wall of the second cavity, and the wick is filled between the end of the reflux member and the cavity wall of the second cavity.

[0027] In this way, the liquid can be quickly transferred from the evaporation end to the condensation end through the reflux component, and absorb heat and evaporate at the evaporation end to form more vapor, thereby improving the thermal conductivity of the heat spreader.

[0028] In a possible implementation, a middle area and an edge area are provided on one side surface of the main shell, and the edge area is arranged around the middle area; a protruding shell is provided, and the protruding shell is connected to the main shell located in the middle area.

[0029] In this way, the condensation rate of the vapor can be increased, thereby accelerating the formation of condensed liquid.

[0030] In a possible implementation, a plurality of protruding shells are provided, the plurality of protruding shells are all located on the same side of the main shell, and the plurality of protruding shells are arranged at intervals.

[0031] In this way, the multiple evaporation ends on the multiple protruding shells can be thermally connected to different heating elements respectively, so that the heat conduction plate is fully utilized.

[0032] In a possible implementation, the projection device further includes a heat sink, the heat generating element is thermally connected to the evaporation end, and the heat sink is thermally connected to the condensation end.

[0033] In this way, the heat sink and the heat pipe cooperate with each other to facilitate cooling of the heat generating element.

[0034] A second aspect of the present application provides a projection device, comprising:

[0035] Heating element;

[0036] A heat spreader, which is thermally connected to the heating element;

[0037] Vapor Chamber includes:

[0038] A housing, used to provide a cavity inside the housing;

[0039] The liquid wick is placed in the cavity and covers at least part of the cavity wall of the cavity; the liquid wick is used to transfer the liquid in the cavity so that part of the liquid flows back from the condensation end at one end of the shell to the evaporation end at the other end of the shell along the extension direction of the cavity;

[0040] A reflux member, one end of which is used to abut against the liquid wick located at the condensation end, and the other end of which is used to abut against the liquid wick located at the evaporation end; the liquid wick is used to transfer the liquid in the cavity so that another part of the liquid flows back from the condensation end to the evaporation end.

[0041] In the projection device provided by the present application, the reflux member can be used to assist the transmission of the liquid and shorten the reflux path of the liquid, so that more liquid can flow back to the evaporation end through the reflux member, while reducing the amount of liquid flowing back through the liquid wick, thereby increasing the reflux rate of the liquid, and further increasing the thermal conductivity of the heat spreader. Compared with not setting a reflux member in the heat spreader, after the reflux member is set in the heat pipe of the present application, whether the heat spreader is placed vertically or horizontally, the reflux member can increase the reflux rate of the liquid and the thermal conductivity of the heat spreader. In addition, the cavity inside the reflux member can be used to transmit steam, and the steam can be transmitted from the evaporation end to the condensation end in the cavity; the existence of the cavity enables the reflux member to improve the liquid transmission efficiency while also improving the transmission efficiency of the steam, further ensuring the thermal conductivity of the heat spreader.

[0042] The structure of the present application and its other inventive objectives and beneficial effects will be more clearly understood through the description of the specific implementation methods in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 It is a structural diagram of a heat spreader in the prior art;

[0045] Figure 2 A first structural diagram of a vapor chamber provided in an embodiment of the present application;

[0046] Figure 3 for Figure 2 Right view of;

[0047] Figure 4 for Figure 2 The view after removing the reflux parts;

[0048] Figure 5 A second structural diagram of a vapor chamber provided in an embodiment of the present application;

[0049] Figure 6 for Figure 2 The structural diagram of the reflux component in FIG.

[0050] Figure 7 for Figure 6 Sectional view at AA in the middle;

[0051] Figure 8 For Figure 6 Another structural diagram of the corresponding reflux component;

[0052] Fig. 9 for Figure 8 Sectional view at the middle BB;

[0053] Fig.10 A schematic diagram of the connection between the heat sink, the heating element, and the heat dissipation element provided in the embodiment of the present application;

[0054] Fig.11 A schematic diagram of a heat-conducting surface on a heat-generating element provided in an embodiment of the present application;

[0055] Fig.12 A schematic diagram of the projection device provided in an embodiment of the present application when projecting onto a projection screen.

[0056] Description of reference numerals:

[0057] 10-heat sink; 100-housing;

[0058] 100A-main housing; 100B-protruding housing;

[0059] 110- cavity; 111- first cavity;

[0060] 112-second cavity; 120-condensation end;

[0061] 130-evaporation end; 140-middle area;

[0062] 150-edge area; 200-wick;

[0063] 300- reflux part; 310- cavity;

[0064] 320-reflow core; 321-first core layer;

[0065] 322-second core layer; 330-support member;

[0066] 400-support column; 500-liquid;

[0067] 600-steam; 20-heating element;

[0068] 21-heat conducting surface; 22-electronic components;

[0069] 30- heat sink; 40- projection equipment;

[0070] 41-housing; 50-projection screen. DETAILED DESCRIPTION

[0071] Some electronic devices in the projection equipment will generate heat during operation. For example, the heat generating element may be a digital micromirror device (DMD). In order to dissipate heat from the heat generating element such as the DMD light valve device, a heat spreader is often provided between the heat generating element and the radiator in the prior art, and the heat of the heat generating element is transferred to the radiator by the heat spreader. Compared with providing heat conducting bumps such as aluminum blocks and copper blocks between the heat generating element and the radiator for heat conduction, the heat conduction efficiency when using a heat spreader for heat conduction is high, so that the heat generating element can be quickly dissipated.

[0072] The structure diagram of the heat spreader in the prior art is as follows: Figure 1 As shown, the liquid wick 200 of the vapor chamber 10 is placed in the cavity 110 inside the vapor chamber 10, and the two end surfaces of the vapor chamber 10 are provided with an evaporation end 130 and a condensation end 120 respectively; at the same time, liquid 500 is also placed in the cavity 110. Therefore, during the use of the existing vapor chamber 10, the liquid 500 near the evaporation end 130 absorbs the heat of the heating element and evaporates to form vapor 600, and the vapor 600 can be transferred to the condensation end 120 in the cavity 110, and the heat absorbing element can absorb the heat of the vapor 600, and the vapor 600 releases heat and condenses to form liquid 500 at the condensation end 120, and the liquid 500 flows back to the evaporation end 130 again through the liquid wick 200; in this way, the liquid 500 continuously transfers heat from the evaporation end 130 to the condensation end 120.

[0073] When the DMD light valve device and other heat generating components are placed vertically, Figure 1 As shown, the surface of the heat spreader 10 also needs to be placed vertically so that the heat spreader 10 can fit the heat spreader 10 with the heating element. The evaporation end 130 on the heat spreader 10 for contacting the heating element is located in the middle of the heat spreader 10, and the liquid 500 will be affected by gravity during the reflux process and has a tendency to flow to the bottom of the heat spreader 10. Therefore, the liquid 500 needs to overcome gravity to reflux to the evaporation end 130, resulting in a slower rate at which the liquid 500 refluxes to the evaporation end 130. The reduction in the reflux rate of the liquid 500 will lead to a reduction in the thermal conductivity efficiency of the heat spreader 10.

[0074] Based on the above problems, the present application provides a projection device, including: a heating element and a heat spreader, the heat spreader is thermally connected to the heating element; the heat spreader includes a shell, a liquid wick and a reflux element, wherein the shell has a cavity inside, and along the extension direction of the cavity, one end of the shell is a condensation end, and the other end of the shell is an evaporation end; the liquid wick is located in the cavity and covers at least part of the cavity wall of the cavity; the liquid wick is used to transfer liquid in the cavity so that part of the liquid flows back from the condensation end to the evaporation end; the reflux element is located in the cavity, one end of the reflux element abuts the liquid wick located at the condensation end, and the other end abuts the liquid wick located at the evaporation end; the reflux element is used to transfer liquid in the cavity so that another part of the liquid flows back from the condensation end to the evaporation end.

[0075] Therefore, the reflux member can be used to assist the transmission of liquid. Since the reflux path on the reflux member is shorter than the reflux path on the wick, the reflux member can increase the reflux rate of the liquid regardless of whether the heat spreader is placed vertically or horizontally, thereby improving the thermal conductivity of the heat spreader.

[0076] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0077] The following specific embodiments are used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0078] The following combination Figures 2 to 10 , the structure of the projection device provided in the embodiment of the present application is described in detail.

[0079] The projection device provided in the embodiment of the present application includes:

[0080] like Figure 2 and Fig.10 As shown, the projection device provided by the present application includes: a heating element 20 and a heat spreader 10, wherein the heat spreader 10 is thermally connected to the heating element 20; the heating element 20 can transfer heat to the heat spreader 10, and after the heat spreader 10 absorbs the heat of the heating element 20, the effect of cooling the heating element 20 can be achieved. Specifically, the heat spreader 10 includes:

[0081] The shell 100 has a cavity 110 inside. Along the extension direction of the cavity 110, one end of the shell 100 is a condensation end 120, and the other end of the shell 100 is an evaporation end 130; wherein the evaporation end 130 of the shell 100 can absorb the heat of the heating element 20, and the condensation end 120 of the shell 100 can transfer the heat to the heat absorption element.

[0082] The liquid wick 200 is located in the cavity 110 and covers at least part of the cavity wall of the cavity 110; the liquid wick 200 is used to transfer the liquid 500 in the cavity 110 so that part of the liquid 500 flows back from the condensation end 120 to the evaporation end 130; thus, the liquid 500 near the evaporation end 130 in the cavity 110 absorbs the heat of the heating element 20 and evaporates to form vapor 600, and the vapor 600 can be transferred to the condensation end 120 through the cavity 110, and the vapor 600 releases heat and condenses to form liquid 500 at the condensation end 120, and part of the liquid 500 can flow back to the evaporation end 130 again through the liquid wick 200. In addition, the liquid wick 200 can cover part of the cavity wall of the cavity 110, or all of the cavity wall of the cavity 110; the liquid 500 is deionized water.

[0083] The reflux member 300 is located in the cavity 110, one end of the reflux member 300 abuts against the wick 200 located at the condensation end 120, and the other end abuts against the wick 200 located at the evaporation end 130; the reflux member 300 is used to transfer the liquid 500 in the cavity 110 so that another part of the liquid 500 flows back from the condensation end 120 to the evaporation end 130. Figure 2 As shown, the return path of the liquid 500 on the absorbent core 200 is a curve, and the return path of the liquid 500 on the return member 300 is a straight line. Therefore, the return path on the return member 300 is shorter than the return path on the absorbent core 200, and the return member 300 can increase the return rate of the liquid 500.

[0084] Thus, in the projection device provided by the present application, the reflow member 300 can be used to assist the transmission of the liquid 500 and shorten the reflow path of the liquid 500, so that more liquid 500 can be reflowed to the evaporation end 130 through the reflow member 300, while reducing the amount of liquid 500 reflowing through the liquid wick 200, thereby improving the reflow rate of the liquid 500, and further improving the thermal conductivity of the heat spreader 10; compared to not setting the reflow member 300 in the heat spreader 10, after the reflow member 300 is set in the heat pipe of the present application, regardless of whether the heat spreader 10 is placed vertically or horizontally, the reflow member 300 can improve the reflow rate of the liquid 500 and the thermal conductivity of the heat spreader 10.

[0085] It should be noted that "vertical" and "horizontal" are relative to the coordinate system in the attached drawings, the Z-axis direction is the "vertical" direction, and the X-axis direction is the "horizontal" direction. Fig.10As shown, the heat conducting surface 21 on the heating element 20 is in a vertical state, so the vapor chamber 10 also needs to be placed vertically so that the evaporation end 130 of the vapor chamber 10 can fit the heat conducting surface 21. In addition, part of the liquid 500 at the condensation end 120 can flow back to the evaporation end 130 again through the liquid wick 200, and another part of the liquid 500 can flow back to the evaporation end 130 through the return member 300. The amount of the liquid 500 flowing back to the evaporation end 130 through the return member 300 is greater than the amount of the liquid 500 flowing back to the evaporation end 130 through the liquid wick 200.

[0086] Specifically, the shell 100 may be made of copper or stainless steel, the wick 200 may be one or more of a metal mesh core, a multi-layer wound mesh core, a powder sintered core, and a metal fiber sintered core, and the wick 200 has a capillary structure inside, and the capillary structure is used to transmit the liquid 500; the capillary structure is a liquid transmission structure inside the wick 200, and the capillary structure enables the liquid 500 to flow back to the evaporation end 130 under the action of capillary force.

[0087] In a specific embodiment, Figure 2 and Fig.10 As shown, when the heating element 20 is a DMD light valve device and the heat-conducting surface 21 on the heating element 20 is placed vertically, the heat spreader 10 can also be placed vertically so that the evaporation end 130 of the heat spreader 10 can be in contact with the heat-conducting surface 21; since the present application provides a reflux member 300 in the heat pipe, most of the liquid formed by condensation of the vapor at the condensation end 120 can flow back to the evaporation end 130 through the reflux member 300, and the liquid 500 is subject to less gravity when returning through the reflux member 300, so the liquid 500 can quickly flow back to the evaporation end 130; thus, compared with the prior art in which the reflux member 300 is not provided in the heat pipe, the present application provides the reflux member 300 in the heat pipe, which can improve the reflux rate of the liquid 500 and the thermal conductivity of the heat spreader 10.

[0088] In the embodiments of the present application, Figures 6 to 9 As shown, the return member 300 includes a return core 320 and a support member 330 connected to each other, one end of the support member 330 extends toward the condensation end 120, and the other end extends toward the evaporation end 130; the support member 330 is located inside the return core 320, so that one end of the return core 320 can abut against the liquid wick 200 located at the condensation end 120, and the other end of the return core 320 can abut against the liquid wick 200 located at the evaporation end 130. In this way, the support member 330 can play a role in supporting the return core 320, ensuring that the return core 320 can stably transmit the liquid 500, so that the liquid 500 flows from the condensation end 120 to the evaporation end 130.

[0089] Exemplarily, the support member 330 is a columnar member, the reflux core 320 can be a powder sintered core, a metal wire mesh core, or a composite of multiple thereof, and the interior of the reflux core 320 has a capillary structure. In addition, a support column 400 can also be provided in the cavity 110, one end of the support column 400 abuts against the wick 200 located at the condensation end 120, and the other end can abut against the wick 200 located at the evaporation end 130, and the support column 400 can play a role in pressing and supporting the wick 200.

[0090] Specifically, Figure 2 As shown, the return member 300 has a cavity 310 inside, one end of the cavity 310 extends toward the condensation end 120, and the other end extends toward the evaporation end 130. The cavity 310 inside the return member 300 can be used to transmit the vapor 600, and the vapor 600 can be transmitted from the evaporation end 130 to the condensation end 120 in the cavity 310; the existence of the cavity 310 enables the return member 300 to improve the transmission efficiency of the liquid 500 while also improving the transmission efficiency of the vapor 600, thereby ensuring the thermal conductivity of the vapor chamber 10.

[0091] In a specific embodiment, Figure 6 and Figure 7 As shown, along the circumference of the support member 330, the return core 320 is arranged around the support member 330; along the extension direction of the support member 330, there is a gap between the middle of the support member 330 and the return core 320, and the gap forms a cavity 310. In this arrangement, the support member 330 and the return core 320 cooperate with each other, which facilitates the formation of the cavity 310.

[0092] In another specific embodiment, Figure 8 and Fig. 9 As shown, the reflux core 320 includes a first core layer 321 and a second core layer 322; the first core layer 321, the second core layer 322 and the support member 330 are all annular members, the inner wall of the first core layer 321 is connected to the outer wall of the support member 330, and the outer wall of the second core layer 322 is connected to the inner wall of the support member 330; the cavity wall of the cavity 310 is located on the second core layer 322; thus, the two ends of the cavity 310 are through-set, and when the reflux member 300 is installed in the cavity 110, the two ends of the cavity 310 can expose the liquid wick 200 located at the condensation end 120 and the liquid wick 200 located at the evaporation end 130, respectively. With such a configuration, the vapor 600 can be quickly transferred from the evaporation end 130 to the condensation end 120 in the cavity 310, further improving the thermal conductivity of the heat spreader 10.

[0093] In the embodiments of the present application, Figure 2 and Figure 4As shown, the housing 100 includes a main housing 100A and a protruding housing 100B connected to each other, and the protruding housing 100B protrudes from one side surface of the main housing 100A; in addition, the cavity 110 includes a first cavity 111 and a second cavity 112 connected to each other; the first cavity 111 is located in the main housing 100A, and the second cavity 112 is located in the housing 100; and the condensation end 120 is located at one end of the main housing 100A away from the protruding housing 100B, and the evaporation end 130 is located at one end of the protruding housing 100B away from the main housing 100A, so that the evaporation end 130 protrudes from one side surface of the main housing 100A. In this way, as Fig.10 As shown in FIG. 1 , when the protruding housing 100B protrudes from one side surface of the main housing 100A, it is convenient for the evaporation end 130 on the protruding housing 100B to abut against the heating element 20. Fig.11 As shown, there will be electronic components 22, such as pins, next to the heat-conducting surface 21 of the heating element 20. If the evaporation end 130 does not protrude from one side surface of the main shell 100A, when the evaporation end 130 abuts against the heat-conducting surface 21, the surface of the main shell 100A will compress and damage the electronic components 22 on the heat-conducting surface 21.

[0094] Further, such as Figure 2 As shown, one end of the reflux member 300 extends into the second cavity 112, the end of the reflux member 300 and the cavity wall of the second cavity 112 are spaced apart, and the wick 200 is filled between the end of the reflux member 300 and the cavity wall of the second cavity 112. With such a configuration, the liquid 500 can be quickly transferred from the evaporation end 130 to the condensation end 120 through the reflux member 300, and absorb heat and evaporate at the evaporation end 130 to form more vapor 600, thereby improving the thermal conductivity of the vapor chamber 10. In addition, the wick 200 filled between the end of the reflux member 300 and the cavity wall of the second cavity 112 can provide reflux liquid 500.

[0095] In a specific embodiment, Figure 3 As shown, the main housing 100A has a middle area 140 and an edge area 150 on one side surface, and the edge area 150 is arranged around the middle area 140; a protruding housing 100B is provided, and the protruding housing 100B is connected to the main housing 100A located in the middle area 140; at this time, the evaporation end 130 is also located in the middle area 140 of the main housing 100A, and after the liquid 500 near the evaporation end 130 absorbs heat to form the vapor 600, it can be evenly diffused around in the cavity 110, so as to evenly transfer the heat to different places of the condensation end 120, so as to accelerate the condensation of the vapor 600 and form the liquid 500. With such a configuration, the condensation rate of the vapor 600 can be improved, thereby accelerating the formation of the liquid 500 and improving the thermal conductivity of the heat spreader 10.

[0096] In another specific embodiment, Figure 5 As shown, there are multiple protruding housings 100B, and the multiple protruding housings 100B are all located on the same side of the main housing 100A, and the multiple protruding housings 100B are arranged at intervals. In this way, the multiple protruding housings 100B have multiple evaporation ends 130, and the multiple evaporation ends 130 can be thermally connected to different heating elements 20, so that the heat conduction plate is fully utilized.

[0097] In the embodiments of the present application, Fig.10 As shown, the projection device further includes a heat sink 30, which is a heat absorbing element. The heating element 20 is thermally connected to the evaporation end 130, and the heat sink 30 is thermally connected to the condensation end 120. The heating element 20 can transfer heat to the evaporation end 130, and the liquid 500 in the cavity 110 near the evaporation end 130 absorbs heat and evaporates to form vapor 600. The vapor 600 is transferred to the condensation end 120 in the cavity 110. The housing 100 located at the condensation end 120 can transfer the heat of the vapor 600 to the heat sink 30, so that the vapor 600 releases heat and condenses to form liquid 500 at the condensation end 120, and the liquid 500 flows back to the evaporation end 130 again through the liquid wick 200 and the return element 300. In this configuration, the heat sink 30 and the heat pipe cooperate with each other to facilitate cooling of the heating element 20. Specifically, the heating element 20 may be a laser or other heat generating element in a projection device, and the digital micromirror chip in the laser generates heat during operation; the heat sink 30 may be one of an aluminum extruded heat sink, a heat pipe fin heat sink, and a water-cooled heat sink. Fig.10 As shown, the thermal conduction method may be direct contact; or, the thermal conduction method may be thermal conduction through a heat conducting member.

[0098] In addition, the present application also provides a projection device, including: a heating element 20; a heat spreader 10, the heat spreader 10 and the heating element 20 are thermally conductive; wherein the heat spreader 10 includes: a shell 100, which is used to provide a cavity 110 located inside the shell 100; a liquid wick 200, which is used to be placed in the cavity 110 and cover at least part of the cavity wall of the cavity 110; the liquid wick 200 is used to transfer the liquid 500 in the cavity 110 so that part of the liquid 500 flows along the cavity 110 extends in the direction of the shell 100, from the condensation end 120 at one end of the shell 100 to the evaporation end 130 at the other end of the shell 100; the reflux member 300, one end of the reflux member 300 is used to abut the wick 200 located at the condensation end 120, and the other end is used to abut the wick 200 located at the evaporation end 130; the wick 200 is used to transfer the liquid 500 in the cavity 110, so that the other part of the liquid 500 flows back from the condensation end 120 to the evaporation end 130. Thus, the reflux member 300 can be used to assist the transmission of the liquid 500. Since the reflux path on the reflux member 300 is shorter than the reflux path on the wick 200, no matter whether the heat spreader 10 is placed vertically or horizontally, the reflux member 300 can increase the reflux rate of the liquid 500, thereby improving the thermal conductivity of the heat spreader 10.

[0099] On the basis of the above embodiments, the present application further provides a projection system, including a projection screen 50 and a projection device 40 in any one of the above embodiments, wherein the projection device 40 is used to project a projection picture onto the projection screen 50 .

[0100] Specifically, Fig.12 As shown, the projection device 40 has a housing 41, and the housing 41 has a receiving cavity inside, and the heat spreader 10, the heating element 20 and the heat sink 30 are all located in the receiving cavity. Fig.12 4 shows a scene diagram when the projection device 40 is projecting on the projection screen 50. The projection screen 50 is located obliquely above the projection device 40. The projection screen 50 can be set on a flat mounting carrier such as a wall to ensure the flatness of the projection screen 50. Fig.10 and Fig.11 As shown, the heating element 20 is a DMD light valve device of a projection device 40 . The heating element 20 generates heat during use, and the heat spreader 10 can transfer the heat of the heating element 20 to the heat sink 30 .

[0101] In the description of the present application, it should be understood that, in addition, the terms "including" and "having" and any variations thereof are intended to cover but not exclude inclusion. The orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0103] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A projection device, characterized in that: include: Heating element; A heat spreader, the heat spreader being thermally connected to the heating element; The heat sink comprises: A shell, wherein the interior of the shell has a cavity, and along the extension direction of the cavity, one end of the shell is a condensation end, and the other end of the shell is an evaporation end; A liquid wick is located in the cavity and covers at least a portion of the cavity wall of the cavity; the liquid wick is used to transfer the liquid in the cavity so that part of the liquid flows back from the condensation end to the evaporation end; A reflux member is located in the cavity, one end of the reflux member abuts against the liquid wick located at the condensation end, and the other end abuts against the liquid wick located at the evaporation end; the reflux member is used to transfer the liquid in the cavity so that another portion of the liquid flows back from the condensation end to the evaporation end.

2. The projection device according to claim 1, characterized in that: The return member comprises a return core and a support member connected to each other, one end of the support member extends toward the condensation end, and the other end of the support member extends toward the evaporation end; The support member is located inside the reflow core.

3. The projection device according to claim 2, characterized in that: The return member has a cavity inside, one end of the cavity extends toward the condensation end, and the other end of the cavity extends toward the evaporation end.

4. The projection device according to claim 3, characterized in that: Along the circumference of the support member, the reflow core is arranged around the support member; along the extension direction of the support member, there is a gap between the middle part of the support member and the reflow core, and the gap forms the cavity.

5. The projection device according to claim 3, characterized in that: The reflow core includes a first core layer and a second core layer; the first core layer, the second core layer and the support member are all annular members, the inner wall of the first core layer is connected to the outer wall of the support member, and the outer wall of the second core layer is connected to the inner wall of the support member; the cavity wall of the cavity is located on the second core layer.

6. The projection device according to any one of claims 1 to 5, characterized in that: The housing comprises a main housing and a protruding housing connected to each other, wherein the protruding housing protrudes from a side surface of the main housing; The cavity includes a first cavity and a second cavity that are interconnected; the first cavity is located in the main shell, and the second cavity is located in the shell; the condensation end is located at one end of the main shell away from the protruding shell, and the evaporation end is located at one end of the protruding shell away from the main shell.

7. The projection device according to claim 6, characterized in that: One end of the reflux member extends into the second cavity, the end of the reflux member and the cavity wall of the second cavity are spaced apart, and the wick is filled between the end of the reflux member and the cavity wall of the second cavity.

8. The projection device according to claim 6, characterized in that: The main housing has a middle area and an edge area on one side surface, and the edge area is arranged around the middle area; the protruding housing is provided with one, and the protruding housing is connected to the main housing located in the middle area; Alternatively, there are multiple protruding shells, and the multiple protruding shells are all located on the same side of the main shell, and the multiple protruding shells are arranged at intervals.

9. The projection device according to any one of claims 1 to 5, characterized in that: It also includes a heat sink, wherein the heat generating element is thermally connected to the evaporating end, and the heat sink is thermally connected to the condensing end.

10. A projection device, characterized in that: include: Heating element; A heat spreader, the heat spreader being thermally connected to the heating element; The heat sink comprises: a housing, for providing a cavity inside the housing; A liquid wick is placed in the cavity and covers at least part of the cavity wall of the cavity; the liquid wick is used to transfer the liquid in the cavity so that part of the liquid flows back from the condensation end at one end of the shell to the evaporation end at the other end of the shell along the extension direction of the cavity; A reflux member, one end of which is used to abut against the liquid wick located at the condensation end, and the other end of which is used to abut against the liquid wick located at the evaporation end; the liquid wick is used to transfer the liquid in the cavity so that another part of the liquid flows back from the condensation end to the evaporation end.

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