Heat dissipation module and projection device

Abstract

A heat dissipation module is suitable for heat dissipation of a heat source and comprises an airflow generator, a heat dissipation substrate, a heat dissipation piece, a baffle and a heat pipe. The heat dissipation substrate is connected with a heat source. The heat pipe is connected between the heat dissipation substrate and the heat dissipation piece and used for transmitting heat energy of the heat source to the heat dissipation piece from the heat dissipation substrate. The heat dissipation piece comprises a body part and a plurality of first fins, the first fins are arranged on the outer periphery of the body part in a surrounding mode, and the first fins and the body part form a containing space. The airflow generator is provided with a rotating axis, is accommodated in the accommodating space and is connected with the body part; the baffle is connected with the first fins and provided with an air inlet face with an opening aligned with the airflow generator. The opening is located on the rotation axis, on a reference plane perpendicular to the rotation axis, at least part of the orthographic projection of each first fin does not overlap with the orthographic projection of the airflow generator, and the orthographic projection of the baffle overlaps with a plurality of orthographic projections of the first fins. The invention further provides a projection device. Therefore, a better heat dissipation effect is achieved.

Description

Technical Field

[0001] The invention relates to a heat dissipation module, and in particular to a projection device using the heat dissipation module. Background Art

[0002] With the advancement of technology, the size of projection devices has gradually shrunk, and even portable projection devices have been developed. However, due to the different appearance designs of projection devices, it is necessary to consider whether the heat dissipation module in the projection device has good heat conduction and whether the heat dissipation module will cause noise problems.

[0003] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some known technologies that are not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention

[0004] The invention provides a heat dissipation module, which has good heat dissipation effect and low noise.

[0005] The present invention provides a projection device including the heat dissipation module.

[0006] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0007] In order to achieve one or part or all of the above purposes or other purposes, one embodiment of the present invention proposes a heat dissipation module suitable for dissipating heat from a heat source, and the heat dissipation module includes an airflow generator, a heat dissipation substrate, a heat sink, a baffle and a heat pipe. The heat dissipation substrate is connected to the heat source. The heat pipe is connected between the heat dissipation substrate and the heat sink, and is used to transfer the heat energy of the heat source from the heat dissipation substrate to the heat sink. The heat sink includes a main body and a plurality of first fins, the plurality of first fins are arranged around the outer periphery of the main body, and the plurality of first fins and the main body form a accommodating space. The airflow generator has a rotation axis and is accommodated in the accommodating space and connected to the main body. The baffle is connected to the plurality of first fins and has an opening aligned with the air inlet surface of the airflow generator. The opening is located on the rotation axis, and on a reference plane perpendicular to the rotation axis, the orthographic projection of each of the plurality of first fins at least partially does not overlap with the orthographic projection of the airflow generator.

[0008] In order to achieve one or part or all of the above purposes or other purposes, one embodiment of the present invention proposes a projection device, including a housing, a light source module, an optical machine module, a projection lens and the above-mentioned heat dissipation module. The heat dissipation module, the light source module, the optical machine module and the projection lens are arranged in the housing. The housing has a first cover plate, a second cover plate and a cylindrical portion connected between the first cover plate and the second cover plate, and the cylindrical portion has an air inlet adjacent to the first cover plate and an air outlet adjacent to the second cover plate. The light source module is used to provide an illumination light beam. The optical machine module is arranged on the transmission path of the illumination light beam, and the optical machine module includes a light valve, which is used to convert the illumination light beam into an image light beam. The projection lens is located on the transmission path of the image light beam from the light valve, and is used to project the image light beam out of the projection device.

[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the projection device of the present invention, the heat dissipation module is suitable for dissipating heat from a heat source. For example, ambient air outside the housing of the projection device can flow into the housing through the air inlet, enter the air inlet surface of the air flow generator from the opening of the baffle, and then enter the multiple air flow channels of the heat sink from the air flow generator, and flow out of the housing from the air outlet to achieve a better heat dissipation effect.

[0010] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of a projection device according to an embodiment of the present invention.

[0012] Figure 2A yes Figure 1 A three-dimensional schematic diagram of a projection device.

[0013] Figure 2B yes Figure 1 A schematic top view of a projection device.

[0014] Figure 3A It is a schematic diagram of a heat dissipation module according to an embodiment of the present invention.

[0015] Figure 3B yes Figure 3A Disassembled side view of the heat dissipation module.

[0016] Figure 4 and Figure 5 yes Figure 3A A disassembled stereoscopic view of the heat dissipation module omitting some components.

[0017] Figure 6 yes Figure 3A Schematic cross-sectional view of a heat dissipation module.

[0018] Figure 7 yes Figure 3A A front view schematic diagram of a heat dissipation module with some components omitted.

[0019] Fig. 8A is a schematic diagram of a heat dissipation module according to another embodiment of the present invention.

[0020] Figure 8B yes Fig. 8A Schematic diagram of the heat dissipation module from another perspective.

[0021] Fig. 9A is a schematic diagram of a heat dissipation module according to another embodiment of the present invention.

[0022] Fig. 9B yes Fig. 9A Schematic diagram of the heat dissipation module from another perspective.

[0023] Fig. 9C yes Fig. 9A Front view of the heat dissipation module.

[0024] Fig.10 is a schematic diagram of a heat dissipation module according to another embodiment of the present invention.

[0025] Fig.11 is a schematic diagram of a heat dissipation module according to another embodiment of the present invention.

[0026] Description of Reference Numerals

[0027] 50: Projection device

[0028] 51: Shell

[0029] 511: First cover

[0030] 512: Second cover

[0031] 513: Cylindrical part

[0032] 5131: First shell

[0033] 5132: Second shell

[0034] 52: Light source module

[0035] 53: Optical-mechanical module

[0036] 531: Light Valve

[0037] 54: Projection lens

[0038] 100, 100B, 100C, 100D, 100E: Cooling module

[0039] 110, 110C, 110D: Airflow generator

[0040] 1101, 1101C: Wind side

[0041] 1102: Air outlet

[0042] 111: Back panel

[0043] 120: Heat dissipation substrate

[0044] 130, 130C, 130E: Heat sink

[0045] 131, 131C, 131D, 131E: Main body part

[0046] 132, 132C, 1321C, 1322C, 132E: First fin

[0047] 13: End

[0048] 132a: Extension

[0049] 133E: Third fin

[0050] 140, 140B, 140C: Baffle

[0051] 141, 141C: Open

[0052] 142B: Second fin

[0053] 150: Heat pipe

[0054] A1: Air inlet

[0055] A2: Air outlet

[0056] A3: Light outlet

[0057] C1: Accommodation space

[0058] D1, D2: length

[0059] E1, E2, E3: Light-emitting elements

[0060] F1: Fan blade

[0061] F11: First End

[0062] F12: Second end

[0063] G1: Spacing

[0064] H1: First opening

[0065] H2: Second opening

[0066] I1: Wind direction

[0067] I2: Air outlet direction

[0068] K1, K2: diameter

[0069] L: Rotation axis

[0070] LB: Lighting beam

[0071] LI: Image beam

[0072] M1: Reference extension line

[0073] M2, M3, M3': Extension line

[0074] P1, P1': air flow channel

[0075] Q1: Spacing

[0076] R1: Rotation direction

[0077] S1, S1': through hole

[0078] X, Y, Z: direction

[0079] α: Angle

[0080] θ, β: angle. DETAILED DESCRIPTION

[0081] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0082] Figure 1 It is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 2A yes Figure 1 A three-dimensional schematic diagram of a projection device. Figure 2B yes Figure 1 A schematic top view of a projection device. It should be noted that Figure 2A and Figure 2B The X direction, Y direction, and Z direction are marked in the figure to show the configuration relationship of each component in the figure. The X direction, Y direction, and Z direction intersect each other perpendicularly, but are not limited to this. Figures 1 to 2B Some irrelevant structures are omitted to facilitate display and identify the component parts to be described.

[0083] Please refer to Figures 1 to 2BThe projector 50 of this embodiment includes a housing 51, a light source module 52, an optical module 53, and a projection lens 54. The light source module 52 is used to provide an illumination beam LB. The optical module 53 is disposed on the transmission path of the illumination beam LB, and includes a light valve 531. The light valve 531 is used to convert the illumination beam LB into an image beam LI. The projection lens 54 is located on the transmission path of the image beam LI from the light valve 531, and is used to project the image beam LI out of the projection device 50 to a projection target (not shown), such as a screen or a wall.

[0084] The light valve 531 is, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoSpanel) or a Digital Micro-mirror Device (DMD). In some embodiments, the light valve 531 may also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optic modulator, or an Acousto-Optic Modulator (AOM). The present invention does not limit the type and kind of the light valve 531. The detailed steps and implementation methods of the method of converting the illumination light beam LB into the image light beam LI by the light valve 531 can be sufficiently taught, suggested, and implemented by the common knowledge in the relevant technical field, so they are not repeated here. In different embodiments, the number of the light valves 531 can be designed to be one to three, and the present invention is not limited thereto.

[0085] The projection lens 54 includes, for example, a combination of one or more optical lenses with diopter, such as various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In some embodiments, the projection lens 54 may also include a planar optical lens to project the image beam LI from the light valve 531 to the projection target. The present invention does not limit the type and type of the projection lens 54.

[0086] Specifically, the housing 51 has a first cover plate 511 and a second cover plate 512 that are opposite to each other, and a cylindrical portion 513 connected between the first cover plate 511 and the second cover plate 512. The first cover plate 511 is provided with a light outlet A3, and the image beam LI from the projection lens 54 is projected from the light outlet A3 of the first cover plate 511 to the outside of the projection device 50.

[0087] The light source module 52, the optical machine module 53 and at least part of the projection lens 54 are arranged in the housing 51. In the present embodiment, the projection lens 54 is entirely arranged in the housing 51. The cylindrical portion 513 is cylindrical in appearance and is assembled from a first shell 5131 and a second shell 5132, for example, two shells together form a hollow cylinder. In other embodiments, a hollow cylinder may also be formed by one shell. The cylindrical portion 513 has an air inlet A1 adjacent to the first cover plate 511, and the cylindrical portion 513 has an air outlet A2 adjacent to the second cover plate 512. The air inlet A1 includes a plurality of first openings H1 surrounding the first cover plate 511, and the air outlet A2 includes a plurality of second openings H2 surrounding the second cover plate 512, for allowing ambient air to flow in from the plurality of first openings H1 of the air inlet A1 and flow out from the plurality of second openings H2 of the air outlet A2.

[0088] In the present embodiment, the projection device 50 further includes a heat dissipation module 100, and the heat dissipation module 100 is disposed in the housing 51. The heat dissipation module 100 is suitable for dissipating heat from a heat source. The heat source is, for example, the light-emitting elements E1, E2, and E3 of the light source module 52, wherein each of the light-emitting elements E1, E2, and E3 is, for example, at least one light-emitting diode (Light-emitting diode) or at least one laser diode (Laserdiode), for providing a light beam of at least one color, but the present invention is not limited thereto. In other embodiments, the light source module 52 is, for example, only configured with one light-emitting element. The heat source may also be the light valve 531 of the optical machine module 53.

[0089] Generally speaking, the micro projector is limited in the choice of fans. Due to the fan frame, only smaller fans can be used with the same diameter, which increases the noise. The projection device of the present invention can solve the above problem.

[0090] Figure 3A It is a schematic diagram of a heat dissipation module according to an embodiment of the present invention. Figure 3B yes Figure 3A Disassembled side view of the heat dissipation module. Figure 4 and Figure 5 yes Figure 3A A disassembled stereoscopic view of the heat dissipation module omitting some components. Figure 6 yes Figure 3A The cross-sectional diagram of the heat dissipation module is shown in Figure 1. Figures 3A to 6 The X direction, Y direction, and Z direction are marked in the figure to show the configuration relationship of each component in the figure. The X direction, Y direction, and Z direction intersect each other perpendicularly, but are not limited to this. Figures 3A to 6 Some irrelevant structures are omitted to facilitate display and identify the component parts to be described.

[0091] Please refer to Figure 3AIn this embodiment, the heat dissipation module 100 includes an airflow generator 110, a heat dissipation substrate 120, a heat sink 130, a baffle 140 and a heat pipe 150. In this embodiment, the airflow generator 110 is, for example, a frameless blower. In this embodiment, the heat dissipation substrate 120 is a substrate made of a metal material, the baffle 140 is a plate made of a metal material, the metal material has a uniform temperature and heat conduction effect, and the heat sink 130 is a heat dissipation fin, but the present invention is not limited thereto. In other embodiments, the heat dissipation substrate 120 and the baffle 140 can also be made of other materials with high thermal conductivity.

[0092] Under the above configuration, the heat dissipation module 100 uses a frameless blower as the airflow generator 110 to achieve the heat dissipation effect, which can make the system configuration more flexible, increase the fan blade size and reduce noise.

[0093] In one embodiment, Figure 3A The heat dissipation module 100 is suitable for use in Figure 2A The projection device 50 of the embodiment is shown in the experiment. It is known that the projection device 50 of the embodiment can reduce the noise by 2dB(A) compared with the conventional projection device and maintain the component temperature within the appropriate range, but the present invention is not limited thereto.

[0094] In detail, the heat dissipation substrate 120 is configured to be connected to a heat source. In this embodiment, the heat source is, for example, a light-emitting element of the light source module 52. The heat dissipation substrate 120 is connected to the heat source by a thermal interface material (TIM). The thermal interface material (TIM) is, for example, thermal grease or a thermal pad, but the present invention is not limited thereto.

[0095] Please refer to Figure 2B and Figure 3A In this embodiment, the heat dissipation substrate 120 is located between the projection lens 54 and the baffle 140. The heat sink 130 is disposed adjacent to the second cover plate 512. The heat pipe 150 is connected between the heat dissipation substrate 120 and the heat dissipation element 130, and is used to transfer the heat energy of the heat source from the heat dissipation substrate 120 to the heat dissipation element 130. The heat dissipation substrate 120 is disposed close to the first cover plate 511, and the airflow generator 110 is close to the second cover plate 512 and is located between the baffle 140 and the second cover plate 512.

[0096] For more details, please refer to FIG. 3A to FIG. 4In this embodiment, the heat sink 130 includes a main body 131 and a plurality of first fins 132. The first fins 132 are disposed around the outer periphery of the main body 131. Specifically, the first fins 132 extend from the main body 131 to the circumferential direction of the airflow generator 110, and the first fins 132 and the main body 131 form a receiving space C1. The airflow generator 110 has a rotating shaft located on the rotating axis L, and the rotating axis L is, for example, parallel to the Y axis. The first fins 132 radially surround the airflow generator 110 with the rotation axis L as the center, wherein each first fin 132 has two opposite ends (unnumbered), one end of each first fin 132 is connected to the main body 131, and the other end thereof extends in a direction away from the main body 131, and the other end of each first fin 132 has an extension portion 132a extending in a direction parallel to the rotation axis L (positive Y-axis direction), so that the first fins 132 and the main body 131 form the accommodating space C1. The airflow generator 110 is accommodated in the accommodating space C1 and connected to the main body 131. The baffle 140 is connected to the extension portion 132a of each first fin 132, and the connection method is, for example, locking, welding or bonding, but the present invention is not limited thereto. The baffle 140 is annular and has an opening 141, and the opening 141 is aligned with the wind inlet surface 1101 of the airflow generator 110. In one embodiment, please refer to Figure 2A , the first fin 132 is located between the baffle plate 140 and the second cover plate 512 .

[0097] In the present embodiment, the opening 141 is circular and is located on the rotation axis L. On a reference plane (e.g., an XZ plane) perpendicular to the rotation axis L, a plurality of orthographic projections of the plurality of first fins 132 on the reference plane partially overlap with the orthographic projection of the airflow generator 110 on the reference plane. The orthographic projection of the baffle 140 on the reference plane overlaps a portion of the orthographic projection of each first fin 132 on the reference plane. The orthographic projection of the airflow generator 110 on the reference plane does not overlap with the orthographic projection of the extension 132a of each first fin 132 on the reference plane. That is, on the reference plane perpendicular to the rotation axis L, at least a portion (e.g., the extension 132a) of the orthographic projection of each of the plurality of first fins 132 does not overlap with the orthographic projection of the airflow generator 110.

[0098] Specifically, in the present embodiment, each of the plurality of first fins 132 is arranged perpendicular to the rotation axis L, and the plurality of first fins 132 are arranged in a spaced relationship along the circumferential direction of the main body 131 to form a plurality of airflow channels P1, and one of the plurality of airflow channels P1 is provided between any two adjacent plurality of first fins 132. In the present embodiment, the airflow generated by the airflow generator 110 enters the air inlet surface 1101 of the airflow generator 110 from the opening 141 of the baffle 140, and then enters the plurality of airflow channels P1 of the heat sink 130 from the airflow generator 110. The airflow at the air inlet surface of the airflow generator 110 is directed in the air inlet direction I1 (refer to Figure 2B ) and the air outlet direction I2 (reference Figure 2B ) has an angle of about 90°, but the present invention is not limited thereto.

[0099] Please refer to Figure 5 In this embodiment, the airflow generator 110 includes a back plate 111 and a fan blade portion (not numbered), the back plate 111 is located on the rotation axis L and connected to the main body portion 131, so that the airflow generator 110 is fixed to the heat sink 130. Further, the back plate 111 is located on a side of the airflow generator 110 away from the wind inlet surface 1101, that is, the airflow generated by the airflow generator 110 will not reach the back plate 111 before passing through the fan blades of the fan blade portion from the wind inlet surface 1101.

[0100] Please refer to Figure 6 In this embodiment, there is a gap G1 between the baffle 140 and the fan blade portion of the airflow generator 110 in a direction parallel to the rotation axis L (e.g., the positive Y-axis direction or the negative Y-axis direction). For example, the gap G1 is less than 0.3 mm to prevent the airflow from flowing out of the air outlet 1102 of the airflow generator 110 and then flowing back. In one embodiment, the baffle 140 is very close to the airflow generator 110, but not in contact with it, to prevent the fan blade portion of the airflow generator 110 from being interfered by the baffle 140 when the fan blade rotates.

[0101] Please refer to Figure 2B In this embodiment, the second opening H2 (air outlet A2) of the cylindrical portion 513 corresponds to the plurality of air flow channels P1. Specifically, the ambient air outside the housing 51 flows into the housing 51 through the first opening H1 (air inlet A1), enters the air inlet surface 1101 of the air flow generator 110 from the opening 141 of the baffle 140, and then enters the plurality of air flow channels P1 of the heat sink 130 from the air flow generator 110, and flows out of the housing 51 from the air outlet A2.

[0102] In the present embodiment, the heat dissipation substrate 120 includes a first plate body 121 and a second plate body 122 connected to each other, and an angle α is formed between the first plate body 121 and the second plate body 122, and the angle α is 90°, but the present invention is not limited thereto. In the present embodiment, on a reference plane (e.g., an XZ plane) perpendicular to the above-mentioned rotation axis L, the orthographic projection of the heat source (e.g., the light emitting elements E1, E2, and E3 of the light source module 52) disposed on the heat dissipation substrate 120 overlaps with the orthographic projection of the airflow generator 110. In other words, the heat source disposed on the heat dissipation substrate 120 is actually located on the path between the airflow entering the housing 51 from the air inlet A1 and flowing to the airflow generator 110 of the heat dissipation module 100, so that a partial heat dissipation effect can be achieved due to the wind flow.

[0103] Figure 7 yes Figure 3A The front view of the heat dissipation module omits some components. It should be noted that Figure 7 The X direction, Y direction, and Z direction are marked to show the configuration relationship of each component in the drawing. The X direction, Y direction, and Z direction intersect each other perpendicularly, but are not limited to this. Please refer to Figure 7 In this embodiment, on a reference plane (e.g., an XZ plane) perpendicular to the rotation axis L, the orthographic projection of the opening 141 overlaps and is smaller than the orthographic projection of the airflow generator 110. In other words, the radius K1 of the opening 141 is smaller than the radius K2 of the airflow generator 110, but the present invention is not limited thereto.

[0104] Other embodiments will be listed below for illustration. It must be noted that the following embodiments use the component numbers and some contents of the previous embodiments, wherein the same numbers are used to represent the same or similar components, and the description of the same technical contents is omitted. The description of the omitted parts can be referred to the previous embodiments, and the following embodiments will not be repeated.

[0105] Fig. 8A is a schematic diagram of a heat dissipation module according to another embodiment of the present invention. Figure 8B yes Fig. 8A A schematic diagram of the heat dissipation module from another perspective. Please refer to Fig. 8A and Figure 8B In this embodiment, the heat dissipation module 100B and Figure 3A The heat dissipation module 100 is slightly different from the heat dissipation module 100, and the main difference is that the baffle 140B includes a plurality of second fins 142B, and the plurality of second fins 142B are arranged at intervals from each other and are respectively located in a plurality of air flow channels P1.

[0106] Thus, the second fins 142B of the baffle 140B are staggered with the first fins 132 of the heat sink 130 to make the fins denser to increase the heat dissipation area. The advantage of this design is that the spacing between adjacent first fins 132 can be improved to be different near the center and far from the center.

[0107] In this embodiment, the second fins 142B extend from the baffle 140B toward the main body 131 of the heat sink 130 along an extension direction (negative Y-axis direction), and the extension direction is parallel to the rotation axis L. In the extension direction, the length D2 of the second fins 142B of the baffle 140B is less than the length D1 of the first fins 132 of the heat sink 130. The second fins 142B are, for example, arranged at intervals in a manner perpendicular to the rotation axis L. In this way, the design of the second fins 142B increases the heat dissipation area.

[0108] Fig. 9A is a schematic diagram of a heat dissipation module according to another embodiment of the present invention. Fig. 9B yes Fig. 9A Schematic diagram of the heat dissipation module from another perspective. Fig. 9C yes Fig. 9A Front view of the heat sink module. 9A to 9C In this embodiment, the fan blade portion of the airflow generator 110C of the heat dissipation module 100C includes a plurality of fan blades F1, the plurality of fan blades F1 are arranged around the rotation axis L, the fan blade portion is suitable for rotating along a rotation direction R1 with the rotation axis L as the center, and each of the plurality of fan blades F1 is inclined in a direction opposite to the rotation direction R1. In other words, the plurality of fan blades F1 of the airflow generator 110C are backward-inclined fan blades, but are not limited thereto.

[0109] In this embodiment, on a reference plane perpendicular to the rotation axis L, the orthographic projection of the airflow generator 110C is completely located within the orthographic projection of the body portion 131C. In other words, the orthographic projection of the airflow generator 110C does not overlap with the orthographic projections of the plurality of first fins 132C.

[0110] Please refer to Fig. 9C In this embodiment, a plurality of first fins 132C are arranged around the airflow generator 110C, and each of the plurality of first fins 132C does not pass through the rotation axis L in the extending direction from close to the rotation axis L to away from the rotation axis L. The advantage of such a design is that it can effectively reduce the flow resistance of the active airflow generator 110C, reduce the pressure at the tip of the first fin 132C, improve the high-frequency whistling sound and the overall noise, and increase the flow rate of the wind.

[0111] In this embodiment, the plurality of first fins 132C are spaced apart from each other along the circumferential direction of the main body 131C to form a plurality of airflow channels P1'. One of the plurality of airflow channels P1' is located between any two adjacent plurality of first fins 132C. The wind generated by the airflow generator 110C can flow out through the plurality of airflow channels P1'.

[0112] In this embodiment, each of the plurality of first fins 132C has an end 13 close to the rotation axis L, a reference extension line M1 passes through the end 13 and the rotation axis L, and an angle θ is formed between the reference extension line M1 and the first fin 132C corresponding to the end 13, and the angle θ is greater than 0 degrees and less than 90 degrees. In other words, Fig. 9C The plurality of first fins 132C are not a radial structure formed with the rotation axis L as the center.

[0113] In this embodiment, each of the plurality of blades F1 has a blade orthographic projection on a reference plane perpendicular to the rotation axis L, and the blade orthographic projection has a first end F11 close to the rotation axis L and a second end F12 away from the rotation axis L. A straight line is formed between the first end F11 and the second end F12 of the blade orthographic projection, and an extension line M2 of the straight line of the blade orthographic projection only has an angle β with two extension lines M3 and M3' of two orthographic projections of two of the plurality of first fins 132C on the reference plane, and the angle β is between 80° and 100°, and two of the plurality of first fins 132C are, for example, first fins 1321C and 1322C, but are not limited thereto. It should be further explained that the outer shape of the blade F1 can be flat or non-flat, and the non-flat shape, for example, includes a curved surface. The advantage of this design is that the spacing between adjacent first fins 132C is larger, which can effectively reduce the flow resistance of the active airflow generator 110C to improve performance, reduce turbulence and reduce noise, and at the same time reduce the impedance of the heat sink 130C to increase the flow generated by the active heat dissipation module 100C.

[0114] In this embodiment, there is a spacing Q1 between one end F12 of each of the plurality of blades F1 away from the rotation axis L and each of the adjacent plurality of heat dissipation fins 132C, and the spacing Q1 is greater than or equal to 5 mm, but is not limited thereto. The advantage of such a design is that when the angle θ is close to 90°, the radial wind flow can have an air flow channel P1' along the wind flow at each position, and the spacing between the blade F1 and the first fin 132C can be reduced to achieve better space utilization.

[0115] Fig.10 is a schematic diagram of a heat dissipation module according to another embodiment of the present invention. Fig.10 In this embodiment, the heat dissipation module 100D and Fig. 9A The heat dissipation module 100C is slightly different, the main difference is that the main body 131D has two through holes S1, which are aligned with the air inlet surface of the air flow generator 110D. Fig. 9A The area of ​​the two through holes S1 is smaller than the area of ​​the opening of the baffle, and the opening of the baffle can refer to Fig. 9A The two through holes S1 can be used as air inlets to improve the heat dissipation effect.

[0116] Fig.11 is a schematic diagram of a heat dissipation module according to another embodiment of the present invention. Fig.11 In this embodiment, the heat dissipation module 100E and Fig.10 The heat dissipation module 100D is slightly different from the heat dissipation module 100D. The main difference is that the heat dissipation element 130E includes a plurality of third fins 133E, and the plurality of third fins 133E are arranged in the two through holes S1'. Both ends of each third fin 133E are connected to the main body 131E. The first fin 132E, the third fin 133E and the main body 131E form a similar Figure 4 The accommodating space C1 is used to accommodate the airflow generator 110D.

[0117] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the projection device of the present invention, the heat dissipation module is suitable for dissipating heat from a heat source. For example, ambient air outside the shell of the projection device can flow into the shell through the air inlet, and enter the air inlet surface of the air flow generator from the opening of the baffle, and then enter the multiple air flow channels of the heat sink from the air flow generator, and flow out of the shell from the air outlet to achieve a better heat dissipation effect. In addition, the heat dissipation module uses a frameless air flow generator to achieve the heat dissipation effect, which can make the system configuration more flexible, increase the fan blade size and reduce noise. Furthermore, the baffle is very close to the air flow generator to prevent the air flow from flowing out from the air outlet of the air flow generator and then flowing back.

[0118] The above description is only the preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the claims and the description of the present invention are still within the scope of the patent coverage of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract and the name of the invention are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit on the number of elements.

Claims

1. A heat dissipation module, suitable for dissipating heat from a heat source, the heat dissipation module comprising an airflow generator, a heat dissipation substrate, a heat dissipation element, a baffle and a heat pipe; wherein The heat dissipation substrate is connected to the heat source; The heat pipe is connected between the heat dissipation substrate and the heat dissipation element, and is used to transfer the heat energy of the heat source from the heat dissipation substrate to the heat dissipation element; The heat sink comprises a main body and a plurality of first fins, wherein the plurality of first fins are disposed around the outer periphery of the main body, and the plurality of first fins and the main body form a containing space; The airflow generator has a rotation axis and is accommodated in the accommodation space and connected to the main body; and The baffle is connected to the plurality of first fins and has an opening aligned with the wind inlet surface of the airflow generator, wherein The opening is located on the rotation axis. On a reference plane perpendicular to the rotation axis, the orthographic projection of each of the plurality of first fins at least partially does not overlap with the orthographic projection of the airflow generator, and the orthographic projection of the baffle overlaps the orthographic projections of the plurality of first fins.

2. The heat dissipation module according to claim 1, characterized in that: On the reference plane perpendicular to the rotation axis, the orthographic projection of the opening overlaps and is smaller than the orthographic projection of the airflow generator.

3. The heat dissipation module according to claim 1, characterized in that: Each of the plurality of first fins is arranged perpendicular to the rotation axis, and the plurality of first fins are arranged in a spaced relationship along the circumferential direction of the main body to form a plurality of air flow channels, and one of the plurality of air flow channels is located between any two adjacent first fins.

4. The heat dissipation module according to claim 3, characterized in that: The baffle includes a plurality of second fins, and the plurality of second fins are arranged at intervals from each other and are respectively located in the plurality of air flow channels.

5. The heat dissipation module according to claim 4, characterized in that: Each of the plurality of second fins extends from the baffle toward the main body of the heat sink along an extension direction, the extension direction being parallel to the rotation axis, wherein in the extension direction, the length of each of the plurality of second fins is less than the length of each of the plurality of first fins.

6. The heat dissipation module according to claim 1, characterized in that: There is a distance between the baffle and the fan blade portion of the airflow generator on the rotation axis.

7. The heat dissipation module according to claim 6, characterized in that: The spacing is less than 0.3 mm.

8. The heat dissipation module according to claim 1, characterized in that: The airflow generator includes a back plate, which is located on the rotation axis and connected to the main body.

9. The heat dissipation module according to claim 1, characterized in that: The airflow generator is a frameless blower.

10. The heat dissipation module according to claim 3, characterized in that: The airflow generated by the airflow generator enters the air inlet surface of the airflow generator from the opening of the baffle plate, and then enters the plurality of airflow channels of the heat sink from the airflow generator.

11. The heat dissipation module according to claim 1, characterized in that: On the reference plane perpendicular to the rotation axis, the orthographic projection of the heat source disposed on the heat dissipation substrate overlaps the orthographic projection of the airflow generator.

12. The heat dissipation module according to claim 1, characterized in that: The fan blade portion of the airflow generator includes a plurality of fan blades, which are arranged around the rotation axis. The fan blade portion is suitable for rotating along a rotation direction with the rotation axis as the center, and each of the plurality of fan blades is inclined in a direction opposite to the rotation direction.

13. The heat dissipation module according to claim 12, characterized in that: The plurality of first fins are arranged around the airflow generator, and each of the plurality of first fins does not pass through the rotation axis in an extending direction from close to the rotation axis to away from the rotation axis.

14. The heat dissipation module according to claim 12, characterized in that: Each of the plurality of first fins has an end portion close to the rotation axis, a reference extension line passes through the end portion and the rotation axis, and an angle between the reference extension line and the first fin corresponding to the end portion is greater than 0 degrees and less than 90 degrees.

15. The heat dissipation module according to claim 12, characterized in that: Each of the multiple fan blades has a fan blade orthographic projection on the reference plane perpendicular to the rotation axis, and the fan blade orthographic projection has a first end close to the rotation axis and a second end away from the rotation axis. The first end and the second end of the fan blade orthographic projection are connected by a straight line, and an extension line of the straight line of the fan blade orthographic projection only has an angle between 80° and 100° between two extension lines of two orthographic projections of two of the multiple first fins on the reference plane.

16. The heat dissipation module according to claim 12, characterized in that: There is a distance between one end of each of the plurality of fan blades away from the rotation axis and each of the adjacent plurality of heat dissipation fins, and the distance is greater than or equal to 5 mm.

17. The heat dissipation module according to claim 13, characterized in that: The plurality of first fins are arranged in a spaced relationship along the circumferential direction of the main body to form a plurality of air flow channels, and one of the plurality of air flow channels is located between any two adjacent first fins.

18. The heat dissipation module according to claim 1, characterized in that: On the reference plane perpendicular to the rotation axis, the orthographic projection of the airflow generator is completely located within the orthographic projection of the main body.

19. The heat dissipation module according to claim 18, characterized in that: The main body has two through holes aligned with the air inlet surface of the airflow generator, and the areas of the two through holes are smaller than the area of ​​the opening.

20. The heat dissipation module according to claim 19, characterized in that: The heat sink includes a plurality of third fins, the plurality of third fins are disposed in the two through holes, and the plurality of first fins, the third fins and the main body form the accommodating space.

21. A projection device, comprising a housing, a light source module, an optical-mechanical module, a projection lens, and a heat dissipation module according to any one of claims 1 to 20, wherein The heat dissipation module, the light source module, the optical machine module and the projection lens are configured in the housing; The housing has a first cover plate and a second cover plate opposite to each other, and a cylindrical portion connected between the first cover plate and the second cover plate, wherein the cylindrical portion has an air inlet adjacent to the first cover plate and an air outlet adjacent to the second cover plate; The light source module is used to provide an illumination beam; The optical-mechanical module is disposed on a transmission path of the illumination light beam, and the optical-mechanical module includes a light valve, and the light valve is used to convert the illumination light beam into an image light beam; and The projection lens is located on the transmission path of the image light beam from the light valve, and is used for projecting the image light beam out of the projection device.

22. The projection device according to claim 21, characterized in that: The heat dissipation substrate is configured to be connected to the light source module, and the heat dissipation substrate is located between the projection lens and the baffle.

23. The projection device according to claim 21, characterized in that: The heat dissipation substrate is close to the first cover plate, and the airflow generator is close to the second cover plate. The ambient air outside the shell flows into the shell through the air inlet, enters the air inlet surface of the airflow generator from the opening of the baffle, and then enters the multiple airflow channels of the heat dissipation element from the airflow generator, and flows out of the shell from the air outlet.

24. The projection device according to claim 21, characterized in that: The first cover plate is provided with a light outlet, and the image light beam is projected from the light outlet of the first cover plate to the outside of the projection device.

25. The projection device according to claim 21, characterized in that: The air inlet includes a plurality of first openings surrounding the first cover plate, and the air outlet includes a plurality of second openings surrounding the second cover plate, wherein the plurality of second openings correspond to the plurality of air flow channels.

26. The projection device according to claim 21, characterized in that: The heat sink is disposed adjacent to the second cover plate, and the plurality of first fins are located between the baffle plate and the second cover plate.

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