Projection device

Abstract

The utility model provides projection equipment, and relates to the technical field of projection. The heat pipe is in heat conduction with the heating element; the heat pipe comprises a pipe shell provided with a pipe cavity extending in the extending direction of the pipe shell; an evaporation section and a condensation section are arranged at the two ends of the tube shell respectively in the extension direction of the tube shell; the liquid absorption core is located in the pipe cavity, at least covers the inner circumferential wall of the pipe cavity and is used for transmitting liquid in the pipe cavity so that the liquid can flow back to the evaporation section from the condensation section; the auxiliary transmission layer is located in the pipe cavity and covers at least part of the face, away from one side of the pipe cavity, of the liquid absorption core; when the heat pipe drives the auxiliary transmission layer to bend, the auxiliary transmission layer is at least used for transmitting liquid in a bending state. According to the projection equipment provided by the invention, the transmission efficiency of liquid in the heat pipe can be improved, and the heat conduction efficiency of the heat pipe 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] A heat pipe is a heat transfer element with high thermal conductivity and is commonly used in projection equipment. The wick of the heat pipe is placed in the inner tube cavity of the heat pipe. The two ends of the heat pipe have an evaporation section and a condensation section respectively. At the same time, liquid is placed in the tube cavity. The liquid in the evaporation section absorbs heat and evaporates, and the vapor can be transferred to the condensation section through the tube cavity. The vapor releases heat and condenses to form liquid in the condensation section, and the liquid flows back to the evaporation section through the wick. In this way, the liquid continuously transfers heat from the evaporation section to the condensation section.

[0003] During use, the existing heat pipes often need to be bent to better meet the overall space design of the projection equipment and make the structure of the projection equipment more compact.

[0004] However, the bending process may cause the wick in the heat pipe to deform, thereby affecting the efficiency of the wick in transferring liquid, resulting in a decrease in the thermal conductivity of the heat pipe. Utility Model Content

[0005] In view of the above problems, the present application provides a projection device that can improve the transmission efficiency of liquid in a heat pipe and improve the thermal conductivity efficiency of the heat pipe.

[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] Heat pipe, the heat pipe is thermally connected to the heating element;

[0010] Heat pipes include:

[0011] The tube shell has a tube cavity extending along the extension direction of the tube shell; along the extension direction of the tube shell, two ends of the tube shell respectively have an evaporation section and a condensation section;

[0012] A liquid wick is located in the tube cavity and covers at least the inner peripheral wall of the tube cavity. The liquid wick is used to transfer the liquid in the tube cavity so that the liquid flows back from the condensation section to the evaporation section.

[0013] The auxiliary transmission layer is located in the tube cavity and covers at least part of the surface of the liquid absorbent core away from the tube cavity; when the heat pipe drives the auxiliary transmission layer to bend, the auxiliary transmission layer is at least used to transmit liquid in the bent state.

[0014] The beneficial effects of the present application are as follows: the auxiliary transmission layer can be used to assist the transmission of liquid in the tube cavity, compensate for the loss of liquid transmission amount on the liquid absorbent core caused by bending, and ensure the normal transmission of liquid at the bending; thus, through the cooperation between the auxiliary transmission layer and the liquid absorbent core in the heat pipe, the transmission efficiency of the liquid in the heat pipe can be improved, and then the thermal conductivity efficiency of the heat pipe can be improved.

[0015] In a possible implementation, one end of the auxiliary transmission layer extends to the evaporation section, and the other end of the auxiliary transmission layer extends to the condensation section.

[0016] In this way, the auxiliary transfer layer can cover more liquid wicks, thereby further improving the transfer efficiency of the liquid in the heat pipe and further improving the thermal conductivity of the heat pipe.

[0017] In a possible implementation, the tube shell has a bending section, the bending section is located between the evaporation section and the condensation section, and the central axis of the bending section is a curve; the auxiliary transmission layer only covers the liquid wick located on the bending section.

[0018] In this way, the normal transmission of liquid at the bend can be guaranteed, and the production cost and overall weight of the heat pipe can be reduced.

[0019] In a possible implementation, the radius of the tube shell is R1, the bending radius of the central axis of the bending section is R2, and R2≥1.5R1.

[0020] In this way, the bending radius of the central axis of the bending section is within this range, which can reduce the influence of the bending on the liquid wick and ensure the transmission efficiency of the liquid in the heat pipe.

[0021] In a possible implementation, a groove is provided on the tube shell, a notch of the groove is located on the inner peripheral wall of the tube cavity, and a portion of the liquid wick is located in the groove.

[0022] In this way, the liquid absorbent core can be embedded in the groove, thereby improving the connection strength between the liquid absorbent core and the inner peripheral wall of the lumen, so that the liquid absorbent core is not easy to fall off from the inner peripheral wall of the lumen.

[0023] In a possible implementation, one end of the groove extends to the evaporation section, and the other end of the groove extends to the condensation section;

[0024] And / or, a plurality of grooves are provided, and the plurality of grooves are distributed at intervals along the circumference of the lumen.

[0025] In this way, the presence of the grooves can further improve the transmission efficiency of the liquid in the heat pipe.

[0026] In a possible implementation, the auxiliary transmission layer and the absorbent core are both annular members, and the outer wall of the auxiliary transmission layer is connected to the inner wall of the absorbent core.

[0027] In this way, the auxiliary transfer layer can fully cover the liquid wick, and the two cooperate with each other to comprehensively improve the transfer efficiency of the liquid in the heat pipe.

[0028] In a possible implementation, the auxiliary transmission layer is a metal mesh layer; and / or the interior of the liquid absorbent core has a capillary structure, and the capillary structure is used to transmit liquid.

[0029] In this way, when the auxiliary transmission layer is bent to a large extent, the liquid can still be transmitted normally; the capillary structure enables the liquid inside the heat pipe to flow back to the evaporation section under the action of capillary force.

[0030] In a possible implementation, the projection device further includes a heat sink, the evaporation section is thermally connected to the heating element, and the condensation section is thermally connected to the heat sink.

[0031] In this way, the heat sink and the heat pipe cooperate with each other to facilitate cooling of the heat generating element.

[0032] A second aspect of the present application provides a projection device, comprising:

[0033] Heating element;

[0034] Heat pipe, used for thermal conduction with the heat generating element;

[0035] Heat pipes include:

[0036] A tube shell, used to provide a tube cavity extending along the extension direction of the tube shell;

[0037] A liquid wick is placed in the tube cavity and covers at least a portion of the inner peripheral wall of the tube cavity. The liquid wick is used to transfer the liquid in the tube cavity so that the liquid flows back from the condensation section at one end of the tube shell to the evaporation section at the other end of the tube shell along the extension direction of the tube shell;

[0038] The auxiliary transmission layer is used to be placed in the tube cavity and covers at least part of the surface of the liquid absorbent core away from the tube cavity; when the heat pipe drives the auxiliary transmission layer to bend, the auxiliary transmission layer is at least used to transmit liquid in the bent state.

[0039] In the projection device provided by the present application, the auxiliary transmission layer can be used to assist the transmission of the liquid in the tube cavity and promote the liquid to flow back to the evaporation section, thereby compensating for the loss of liquid transmission amount on the wick caused by bending, ensuring the normal transmission of the liquid at the bend, and avoiding the phenomenon that the liquid cannot be transmitted to the evaporation section due to the damage to the internal transmission structure of the wick caused by bending. Therefore, compared with not setting the auxiliary transmission layer in the heat pipe, in the present application, the auxiliary transmission layer and the wick in the heat pipe cooperate with each other, and when the heat pipe is bent or not bent, the transmission efficiency of the liquid in the heat pipe can be improved; thus, the thermal conductivity efficiency when the heat pipe is bent and the thermal conductivity efficiency when the heat pipe is not bent can also be improved. In addition, when the auxiliary transmission layer covers the wick, the auxiliary transmission layer can also play a role in strengthening the wick, improving the wick's anti-bending ability, and reducing the impact of bending on the internal transmission structure of the wick. In addition, the liquid wick can be embedded in the groove on the tube shell, the connection strength between the liquid wick and the inner wall of the tube cavity is improved, and the liquid wick is not easy to fall off from the inner wall of the tube cavity; and the presence of the groove can further improve the transmission efficiency of the liquid in the heat pipe, thereby improving the thermal conductivity efficiency of the heat pipe.

[0040] 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

[0041] 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.

[0042] Figure 1 is a cross-sectional view of a heat pipe in the prior art;

[0043] Figure 2 It is a cross-sectional view of a heat pipe in the prior art when it is in a bent state;

[0044] Figure 3 for Figure 2 A magnified view of point A;

[0045] Figure 4 A cross-sectional view of a heat pipe provided in an embodiment of the present application;

[0046] Figure 5 for Figure 4 The first cross-sectional view at the middle BB;

[0047] Figure 6 for Figure 4The second cross-sectional view at the middle BB;

[0048] Figure 7 A first cross-sectional view of a heat pipe provided in an embodiment of the present application when the heat pipe is in a bent state;

[0049] Figure 8 for Figure 7 A magnified view of point C;

[0050] Fig. 9 A second cross-sectional view of the heat pipe provided in the embodiment of the present application when it is in a bent state;

[0051] Fig.10 A schematic diagram of a projection device provided in an embodiment of the present application projecting on a projection screen;

[0052] Fig.11 It is a schematic diagram of the connection between the heat pipe, the heating element and the heat dissipation element in the projection equipment.

[0053] Description of reference numerals:

[0054] 100-tube shell; 110-tube cavity;

[0055] 111-inner peripheral wall; 112-inner end wall;

[0056] 120-evaporation section; 130-middle section;

[0057] 140-condensation section; 150-bending section;

[0058] 160-groove; 200-wick;

[0059] 300- auxiliary transmission layer; 400- heating element;

[0060] 500-heat sink; 600-crack;

[0061] 700-liquid; 800-vapor;

[0062] 20-projection equipment; 30-projection screen. DETAILED DESCRIPTION

[0063] The structure diagram of the heat pipe in the prior art is as follows Figure 1As shown, the wick 200 of the heat pipe is placed in the tube cavity 110 inside the heat pipe, and the two ends of the heat pipe are respectively provided with an evaporation section 120 and a condensation section 140. At the same time, liquid 700 is also placed in the tube cavity 110. The liquid 700 in the evaporation section 120 absorbs heat and evaporates to form vapor 800. The vapor 800 can be transferred to the condensation section 140 through the tube cavity 110. The vapor 800 releases heat and condenses to form liquid 700 in the condensation section 140. The liquid 700 flows back to the evaporation section 120 again through the wick 200. In this way, the liquid 700 continuously transfers heat from the evaporation section 120 to the condensation section 140. Figure 2 As shown, the heat pipe needs to be bent during use to better meet the overall space design of the projection device and make the structure of the projection device more compact.

[0064] However, the wick 200 is generally formed by powder sintering, and the wick has poor anti-bending performance; the bending process may cause the wick 200 in the heat pipe to deform, thereby destroying the transmission structure inside the wick 200, affecting the transmission efficiency of the wick 200 to the liquid 700. Figure 3 As shown, the side of the wick 200 facing the bending direction will be stretched during the bending process. When the stretching exceeds a certain degree, a crack 600 will be generated on the wick 200. The existence of the crack 600 prevents the liquid 700 from flowing back to the evaporation section 120 through the wick 200, thereby reducing the efficiency of the wick 200 in transmitting the liquid 700, resulting in a decrease in the thermal conductivity of the heat pipe. In addition, the side of the wick 200 away from the bending direction will be squeezed during the bending process. When the squeezing exceeds a certain degree, the transmission structure inside the wick 200 will also be damaged, thereby reducing the efficiency of the wick 200 in transmitting the liquid 700.

[0065] Based on the above problems, the present application provides a projection device, comprising: a heating element and a heat pipe, the heat pipe being thermally connected to the heating element; the heat pipe comprising a tube shell, a liquid wick and an auxiliary transmission layer; wherein the tube shell has a tube cavity extending along the extension direction of the tube shell, and along the extension direction of the tube shell, the two ends of the tube shell respectively have an evaporation section and a condensation section; the liquid wick is located in the tube cavity and covers at least a portion of the inner circumferential wall of the tube cavity, and the liquid wick is used to transmit liquid in the tube cavity so that the liquid flows back from the condensation section to the evaporation section; the auxiliary transmission layer is located in the tube cavity and covers at least a portion of the surface of the liquid wick facing away from the tube cavity; and when the heat pipe drives the auxiliary transmission layer to bend, the auxiliary transmission layer is at least used to transmit liquid in the bent state. Therefore, the auxiliary transfer layer can be used to assist the transfer of liquid, compensating for the loss of liquid transfer amount on the liquid absorbent core caused by bending, thereby ensuring the normal transfer of liquid at the bend and avoiding the phenomenon that the liquid cannot be transferred to the evaporation section due to the bending of the liquid absorbent core; therefore, the auxiliary transfer layer and the liquid absorbent core cooperate with each other to improve the transfer efficiency of the liquid in the heat pipe, and then improve the thermal conductivity efficiency of the heat pipe.

[0066] 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.

[0067] 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.

[0068] The following combination Figures 4 to 10 , the structure of the projection device provided in the embodiment of the present application is described in detail.

[0069] like Figure 4 , Figure 5 and Fig.10 As shown, the projection device provided by the present application includes: a heating element 400 and a heat pipe, wherein the heat pipe is thermally connected to the heating element 400, the heating element 400 can transfer heat to the heat pipe, and after the heat pipe absorbs the heat of the heating element 400, the effect of cooling the heating element 400 can be achieved. Specifically, the heat pipe includes:

[0070] The tube shell 100 has a tube cavity 110 extending along the extension direction of the tube shell 100; along the extension direction of the tube shell 100, the two ends of the tube shell 100 respectively have an evaporation section 120 and a condensation section 140. Among them, the evaporation section 120 can absorb the heat of the heating element 400, and the condensation section 140 can transfer the heat to the heat sink 500. In addition, along the extension direction of the tube shell 100, the middle part of the tube shell 100 has an intermediate section 130, which can separate the evaporation section 120 and the condensation section 140, and the tube shell 100 located in the intermediate section 130 can also play a role in heat insulation.

[0071] The wick 200 is located in the lumen 110 and covers at least the inner peripheral wall 111 of the lumen 110. The wick 200 is used to transfer the liquid 700 in the lumen 110 so that the liquid 700 flows back from the condensation section 140 to the evaporation section 120. The liquid 700 in the evaporation section 120 of the lumen 110 absorbs heat and evaporates to form vapor 800. The vapor 800 can be transferred to the condensation section 140 through the lumen 110. The vapor 800 releases heat and condenses to form the liquid 700 in the condensation section 140. The liquid 700 flows back to the evaporation section 120 again through the wick 200. In addition, in addition to covering the inner peripheral wall 111 of the lumen 110, the wick 200 can also cover the inner end wall 112 of the lumen 110, and the inner end wall 112 is connected to the inner peripheral wall 111. The liquid 700 is deionized water.

[0072] The auxiliary transmission layer 300 is located in the lumen 110 and covers at least part of the surface of the liquid absorbent core 200 away from the lumen 110; when the heat pipe drives the auxiliary transmission layer 300 to bend, the auxiliary transmission layer 300 is at least used to transmit the liquid 700 in the bent state. It should be noted that when the heat pipe drives the auxiliary transmission layer 300 to bend, the liquid absorbent core 200 covered by the auxiliary transmission layer 300 will also bend, and the auxiliary transmission layer 300 can still normally transmit the liquid 700 in the bent state.

[0073] Thus, in the projection device provided by the present application, the auxiliary transmission layer 300 can be used to assist the transmission of the liquid 700 in the tube cavity 110, and compensate for the loss of liquid transmission amount on the liquid wick 200 caused by bending, thereby ensuring the normal transmission of the liquid 700 at the bending point, and avoiding the phenomenon that the liquid 700 cannot be transmitted to the evaporation section 120 due to the damage to the internal transmission structure of the liquid wick 200 caused by the bending; thus, compared with not setting the auxiliary transmission layer 300 in the heat pipe, the present application can improve the transmission efficiency of the liquid 700 in the heat pipe through the cooperation between the auxiliary transmission layer 300 and the liquid wick 200 in the heat pipe; and the improvement of the transmission efficiency of the liquid 700 in the heat pipe can promote the improvement of the thermal conductivity efficiency of the heat pipe.

[0074] In addition, in addition to being able to transmit liquid 700 in a bent state, the auxiliary transmission layer 300 can also transmit liquid 700 in a non-bent state; when the heat pipe is bent, the auxiliary transmission layer 300 ensures the normal transmission of the liquid 700 at the bend; when the heat pipe is not bent, the auxiliary transmission layer 300 and the liquid absorbent core 200 can both transmit the liquid 700; thus, compared with the prior art, the present application improves the transmission efficiency of the liquid 700 in the heat pipe by cooperating with the auxiliary transmission layer 300 and the liquid absorbent core 200 when the heat pipe is bent or not; thus, the thermal conductivity efficiency of the heat pipe when it is bent and the thermal conductivity efficiency of the heat pipe when it is not bent can both be improved.

[0075] In addition, when the auxiliary transmission layer 300 covers the absorbent core 200, the auxiliary transmission layer 300 can also strengthen the absorbent core 200, improve the bending resistance of the absorbent core 200, and reduce the impact of bending on the internal transmission structure of the absorbent core 200.

[0076] It should be noted that the auxiliary transmission layer 300 may cover a portion of the surface of the absorbent core 200 that is away from the lumen 110, or may cover the entire surface of the absorbent core 200 that is away from the lumen 110. The auxiliary transmission layer 300 has a certain anti-bending ability, so that the auxiliary transmission layer 300 can also normally transmit the liquid 700 in a bent state.

[0077] It should be noted that during the bending process of the absorbent core 200, the absorbent core 200 may generate cracks 600 due to excessive stretching, thereby causing the transmission structure inside the absorbent core 200 to be damaged; or, the transmission structure inside the absorbent core 200 may be damaged due to excessive squeezing; Figure 8 As shown, when the auxiliary transmission layer 300 is covered on the over-stretched or over-extended absorbent core 200, the auxiliary transmission layer 300 can ensure the normal transmission of the liquid 700 at the bend, avoiding the phenomenon that the liquid 700 cannot be transmitted to the evaporation section 120 due to the damage to the internal transmission structure of the absorbent core 200 caused by the bending.

[0078] In the embodiments of the present application, Figure 4 As shown, one end of the auxiliary transmission layer 300 extends to the evaporation section 120, and the other end of the auxiliary transmission layer 300 extends to the condensation section 140. In this way, the auxiliary transmission layer 300 can cover more liquid wicks 200, thereby further improving the transmission efficiency of the liquid 700 in the heat pipe and further improving the thermal conductivity of the heat pipe. Along the extension direction of the heat pipe, the auxiliary transmission layer 300 has a certain length, and along the extension direction perpendicular to the heat pipe, the auxiliary transmission layer 300 has a certain thickness.

[0079] In the embodiments of the present application, Figures 7 to 9As shown, the tube shell 100 has a bending section 150, and the bending section 150 is located between the evaporation section 120 and the condensation section 140, and the central axis of the bending section 150 is a curve; the auxiliary transmission layer 300 only covers the wick 200 located on the bending section 150. In this way, the auxiliary transmission layer 300 only covers the wick 200 located on the bending section 150, which can not only ensure the normal transmission of the liquid 700 at the bending part, but also reduce the production cost and overall weight of the heat pipe. In addition, the tube shell 100 can have multiple bending sections 150, and the wick 200 on each bending section 150 is covered with the auxiliary transmission layer 300. When the bending section 150 is located between the evaporation section 120 and the condensation section 140, the bending section 150 is a part of the middle section 130 of the tube shell 100. In a specific embodiment, the bending section 150 may be a part of the evaporation section 120 or the condensation section 140, that is, the heat pipe is bent in the evaporation section 120 or the condensation section 140. It should be noted that the bending portion of the bending section 150 is located in the middle of the bending section 150, and there may be straight pipes of a certain length at both ends of the bending section 150, and the straight pipe is a pipe section of the heat pipe that is not bent.

[0080] Specifically, Figure 7 As shown, the radius of the tube shell 100 is R1, and the bending radius of the central axis of the bending section 150 is R2, and R2 ≥ 1.5R1. In this way, the bending radius of the central axis of the bending section 150 is within this range, which can reduce the influence of bending on the wick 200 and ensure the transmission efficiency of the liquid 700 in the heat pipe. It should be noted that after the auxiliary transmission layer 300 covers the wick 200 located on the bending section 150, the anti-bending ability of the wick 200 can be improved, so that the bending radius of the bending section 150 is smaller and the bending amplitude is larger under the premise of ensuring the transmission efficiency of the wick 200 to the liquid 700. If the wick 200 located on the bending section 150 is not covered by the auxiliary transmission layer 300, at this time, the bending radius of the central axis of the bending section 150 R2 needs to be greater than 3R1 to ensure that the bending will not cause damage to the internal transmission structure of the wick 200 and to ensure the transmission efficiency of the wick 200 to the liquid 700. In addition, after the auxiliary transmission layer 300 covers the absorbent core 200 located on the bending section 150, compared with the absorbent core 200 located on the bending section 150 not being covered by the auxiliary transmission layer 300, the bending arc length of the heat pipe can be reduced by half, and the effective straight pipe length of the heat pipe is increased by 3R.

[0081] In the embodiments of the present application, Figure 6As shown, a groove 160 is provided on the tube shell 100, the notch of the groove 160 is located on the inner peripheral wall 111 of the tube cavity 110, and part of the liquid absorbent core 200 is located in the groove 160. In this way, the liquid absorbent core 200 can be embedded in the groove 160, thereby improving the connection strength between the liquid absorbent core 200 and the inner peripheral wall 111 of the tube cavity 110, so that the liquid absorbent core 200 is not easy to fall off from the inner peripheral wall 111 of the tube cavity 110; and when the liquid absorbent core 200 is embedded in the groove 160, the anti-bending ability of the liquid absorbent core 200 can also be improved. Specifically, the groove 160 can be a V-shaped groove, or the groove 160 can be a trapezoidal groove.

[0082] Exemplarily, one end of the groove 160 extends to the evaporation section 120, and the other end of the groove 160 extends to the condensation section 140; part of the liquid 700 can flow back from the condensation section 140 to the evaporation section 120 through the wick 200 outside the groove 160, and part of the liquid 700 can flow back from the condensation section 140 to the evaporation section 120 through the wick 200 inside the groove 160; the presence of the groove 160 can further improve the transmission efficiency of the liquid 700 in the heat pipe.

[0083] For example, Figure 6 As shown, a plurality of grooves 160 are provided, and the plurality of grooves 160 are spaced apart along the circumference of the lumen 110. When the number of grooves 160 increases, more absorbent cores 200 can be placed in the grooves 160, thereby improving the absorption and infusion capabilities of the absorbent core 200. Specifically, the plurality of grooves 160 can be spaced apart equidistantly along the circumference of the lumen 110.

[0084] In the embodiments of the present application, Figure 5 As shown, the auxiliary transmission layer 300 and the liquid absorbent core 200 are both annular members, and the outer wall of the auxiliary transmission layer 300 is connected to the inner wall of the liquid absorbent core 200. In this way, the auxiliary transmission layer 300 can fully cover the liquid absorbent core 200, and the two cooperate with each other to fully improve the transmission efficiency of the liquid 700 in the heat pipe.

[0085] In addition, the auxiliary transmission layer 300 is a metal mesh layer or a metal nanowire, which has good anti-bending performance, so as to ensure that when the auxiliary transmission layer 300 is bent to a large extent, it can still normally transmit the liquid 700. Specifically, when the auxiliary transmission layer 300 is a copper mesh, the copper mesh is a woven copper mesh, and the mesh number of the copper mesh ranges from 60 to 200; when the auxiliary transmission layer 300 is a metal fiber, the aspect ratio of the metal fiber ranges from 30 to 3000.

[0086] In addition, the interior of the wick 200 has a capillary structure, which is used to transfer liquid; the capillary structure is a liquid transfer structure in the wick 200, and the capillary structure allows the liquid 700 inside the heat pipe to flow back to the evaporation section 120 under the action of capillary force; the wick 200 can be formed by sintering metal powder, for example, the metal powder is copper powder, the mesh number of the copper powder ranges from 30 to 500 mesh, and the sintering thickness ranges from 0.1 to 0.5 mm. Further, the sintered powder will be partially filled in the groove 160 and sintered into one with the groove 160. When the heat pipe is a copper pipe, the groove 160 can be directly processed on the inner wall of the copper pipe, the wall thickness of the copper pipe ranges from 0.2 to 0.5 mm, the number of grooves 160 ranges from 100 to 300, and the height of the groove 160 ranges from 0.1 to 0.35 mm.

[0087] In the embodiments of the present application, Fig.10 As shown, the projection device also includes a heat sink 500, which is a heat absorbing element; the evaporation section 120 is thermally connected to the heating element 400, and the condensation section 140 is thermally connected to the heat sink 500. The liquid 700 in the evaporation section 120 in the lumen 110 absorbs the heat of the heating element 400 and evaporates to form vapor 800. The vapor 800 can be transferred to the condensation section 140 through the lumen 110. The heat sink 500 can absorb the heat of the vapor 800. The vapor 800 releases heat and condenses to form liquid 700 in the condensation section 140. The liquid 700 flows back to the evaporation section 120 again through the liquid wick 200. With such an arrangement, the heat sink 500 and the heat pipe cooperate with each other to facilitate cooling of the heating element 400. Specifically, the heating element 400 can be a laser or other heat-generating element in the projection device, and the heat sink 500 can 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.

[0088] In a specific embodiment, Fig.10 and Fig.11 As shown, the heating element 400 in the projection device is a laser, and the heat sink 500 in the projection device is a fin heat sink; and the evaporation section 120 of the heat pipe is thermally connected to the heating element 400 through the heat conduction block, and the condensation section 140 of the heat pipe passes through the fin heat sink and abuts against the heat sink fins to form thermal conduction; thus, the liquid 700 in the evaporation section 120 of the heat pipe absorbs the heat of the heating element 400 and evaporates to form vapor 800, and the heat sink 500 can absorb the heat of the vapor 800, and the vapor 800 releases heat in the condensation section 140 and condenses to form liquid 700. In addition, as Fig.10 As shown, the bent section 150 of the tube shell 100 is located between the evaporation section 120 and the condensation section 140 .

[0089] In addition, the present application also provides a projection device, including: a heating element 400; a heat pipe, which is used for thermal conduction with the heating element 400; the heat pipe includes: a tube shell 100, which is used to provide a tube cavity 110 extending along the extension direction of the tube shell 100; a liquid wick 200, which is used to be placed in the tube cavity 110 and covers at least a portion of the inner circumferential wall 111 of the tube cavity 110, and the liquid wick 200 is used to transfer the liquid 700 in the tube cavity 110, so that the liquid 700 flows back from the condensation section 140 at one end of the tube shell 100 to the evaporation section 120 at the other end of the tube shell 100 along the extension direction of the tube shell 100; an auxiliary transmission layer 300, which is used to be placed in the tube cavity 110 and covers at least a portion of the surface of the liquid wick 200 away from the tube cavity 110; when the heat pipe drives the auxiliary transmission layer 300 to bend, the auxiliary transmission layer 300 is at least used to transmit the liquid 700 in the bent state. Thus, the auxiliary transmission layer 300 can be used to assist the transmission of the liquid 700 in the tube cavity 110, compensate for the loss of liquid transmission amount on the liquid absorbent core 200 caused by bending, and ensure the normal transmission of the liquid 700 at the bending; thus, through the cooperation between the auxiliary transmission layer 300 and the liquid absorbent core 200 in the heat pipe, the transmission efficiency of the liquid 700 in the heat pipe can be improved, and then the thermal conductivity efficiency of the heat pipe can be improved.

[0090] Based on the above embodiments, the present application also provides a projection system, such as Fig.11 As shown, the projection system includes a projection screen 30 and a projection device 20 in any of the above embodiments, and the projection device 20 is used to project a projection image onto the projection screen 30. The specific structure, working principle and function of the projection device 20 have been described in detail in the above embodiment 1, and will not be repeated here.

[0091] like Fig.11 As shown in the figure, a scene diagram when the projection device 20 is projected on the projection screen 30 is shown. The projection screen 30 is located obliquely above the projection device 20. The projection screen 30 can be set on a flat mounting carrier such as a wall to ensure the flatness of the projection screen 30. Fig.10 As shown, the heating element 400 is a laser in the light source device of the projection device 20 . The laser can emit red laser, blue laser or green laser. The heating element 400 will generate heat during use, and the heat pipe can transfer the heat of the heating element 400 to the radiator 500 .

[0092] 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.

[0093] 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.

[0094] 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 pipe, the heat pipe being thermally connected to the heat generating element; The heat pipe comprises: The tube shell has a tube cavity extending along the extension direction of the tube shell; along the extension direction of the tube shell, two ends of the tube shell respectively have an evaporation section and a condensation section; a liquid wick located in the tube cavity and covering at least the inner peripheral wall of the tube cavity, the liquid wick being used to transfer the liquid in the tube cavity so that the liquid flows back from the condensation section to the evaporation section; The auxiliary transmission layer is located in the tube cavity and covers at least a portion of the surface of the liquid absorbent core away from the tube cavity; when the heat pipe drives the auxiliary transmission layer to bend, the auxiliary transmission layer is at least used to transmit the liquid in the bent state.

2. The projection device according to claim 1, characterized in that: One end of the auxiliary transmission layer extends to the evaporation section, and the other end of the auxiliary transmission layer extends to the condensation section.

3. The projection device according to claim 1, characterized in that: The tube shell has a bending section, the bending section is located between the evaporation section and the condensation section, and the central axis of the bending section is a curve; the auxiliary transmission layer only covers the liquid wick located on the bending section.

4. The projection device according to claim 3, characterized in that: The radius of the tube shell is R1, the bending radius of the central axis of the bending section is R2, and R2≥1.5R1.

5. The projection device according to any one of claims 1 to 4, characterized in that: The tube shell is provided with a groove, the notch of the groove is located on the inner peripheral wall of the tube cavity, and part of the liquid absorbent core is located in the groove.

6. The projection device according to claim 5, characterized in that: One end of the groove extends to the evaporation section, and the other end of the groove extends to the condensation section; And / or, the groove is provided in plurality, and the plurality of grooves are distributed at intervals along the circumference of the lumen.

7. The projection device according to any one of claims 1 to 4, characterized in that: The auxiliary transmission layer and the absorbent core are both annular members, and the outer ring wall of the auxiliary transmission layer is connected to the inner ring wall of the absorbent core.

8. The projection device according to any one of claims 1 to 4, characterized in that: The auxiliary transmission layer is a metal mesh layer; and / or the interior of the liquid absorbent core has a capillary structure, and the capillary structure is used to transmit the liquid.

9. The projection device according to any one of claims 1 to 4, characterized in that: It also includes a heat sink, the evaporation section is thermally connected to the heating element, and the condensation section is thermally connected to the heat sink.

10. A projection device, characterized in that: include: Heating element; A heat pipe, used for thermally conducting with the heat generating element; The heat pipe comprises: A tube shell, used to provide a tube cavity extending along the extension direction of the tube shell; A liquid wick is placed in the tube cavity and covers at least a portion of the inner peripheral wall of the tube cavity. The liquid wick is used to transfer the liquid in the tube cavity so that the liquid flows back from the condensation section at one end of the tube shell to the evaporation section at the other end of the tube shell along the extension direction of the tube shell; The auxiliary transmission layer is used to be placed in the tube cavity and cover at least a portion of the surface of the liquid absorbent core away from the tube cavity; when the heat pipe drives the auxiliary transmission layer to bend, the auxiliary transmission layer is at least used to transmit the liquid in the bent state.

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