Radiator, projector light machine and projector

Abstract

This application provides a heat sink, a projector optical engine, and a projector. The heat sink includes a substrate, a plurality of first fins and a plurality of second fins connected to the substrate. The substrate is used to abut against a heat source. The plurality of first fins are spaced apart on the side of the substrate facing the heat source, and the plurality of second fins are spaced apart on the side of the substrate away from the heat source. The plurality of first fins are distributed on both sides of the heat source, and the plurality of first fins on each side are inclined away from the heat source. The length of the heat dissipation surface of the plurality of first fins on each side increases from farthest to near the heat source. The heat sink provided in this embodiment can improve the heat dissipation efficiency of the projector.

Description

Technical Field

[0001] This application relates to the field of optical projection equipment technology, and in particular to a heat sink, a projector optical engine, and a projector using the projector optical engine. Background Technology

[0002] A projector is a device that projects images or videos onto a screen. It can be connected to computers, game consoles, and other devices through different interfaces to play corresponding video signals. The projector's optical engine integrates the display chip, light source, heat dissipation module, and other components, making it the most crucial part of the projector.

[0003] Currently, in a common design, the projector optical engine includes an external housing and internal components such as a light-emitting diode (LED) lamp board, reflector, rear Fresnel lens, heat-insulating glass, liquid crystal display (LCD), front Fresnel lens, and projection lens. The LED lamp board is the light source of the projector optical engine; it emits light through LEDs, which forms the basis of the projected image. The LED lamp board provides a stable and efficient light source, crucial for achieving high-quality projection. To provide sufficient brightness, the LED lamp board needs to operate at high power, which generates considerable heat. Therefore, a suitable heat dissipation module is required to cool the LED lamp board.

[0004] However, in the aforementioned projector optical engine, the heat dissipation efficiency of the heat dissipation module still needs to be improved. Summary of the Invention

[0005] This application provides a heat sink, a projector optical engine, and a projector. The heat sink provided in this embodiment can improve the heat dissipation efficiency of the projector.

[0006] In a first aspect, this application provides a heat sink, including a substrate, a plurality of first fins and a plurality of second fins connected to the substrate, the substrate being used to abut against a heat source, the plurality of first fins being spaced apart on the side of the substrate facing the heat source, and the plurality of second fins being spaced apart on the side of the substrate away from the heat source.

[0007] In this configuration, multiple first fins are distributed on both sides of the heat source. The multiple first fins on each side are inclined away from the heat source, and the heat dissipation surface length of the multiple first fins on each side increases in the direction from far to near the heat source.

[0008] In one possible implementation, multiple first fins on each side are distributed at equal or non-equal intervals; and the distance between two adjacent first fins on each side is d1, where d1 satisfies: 2mm≤d1≤8mm.

[0009] In one possible implementation, the thickness of the plurality of first fins on each side is sequentially reduced in the arrangement direction away from the heat source.

[0010] In one possible implementation, the heat sink further includes two root fins corresponding to a plurality of first fins on both sides, the root fins being connected to the substrate and disposed adjacent to the heat source; wherein, at least two of the plurality of first fins on each side are connected to the root fins.

[0011] In one possible implementation, the thickness of the substrate gradually decreases from the middle of the connection to the heat source toward both ends; the two surfaces of the substrate, on which the first fin and the second fin are respectively provided, are inclined surfaces, and the inclined surfaces are set at an angle α with the horizontal extension direction of the substrate, where α satisfies: 0°<α≤5°.

[0012] Secondly, this application provides a projector optical engine, including a light source, an optical engine body, and a heat sink as described above. The optical engine body includes a housing assembly and a reflector. The housing assembly includes a first mounting part adapted to install the reflector. The light source and the reflector are aligned and installed. The reflector is used to reflect the light from the light source. A plurality of first fins are distributed on both sides of the first mounting part, and the heat dissipation surface of the plurality of first fins is inclined in a substantially parallel manner to the outer wall surface of the first mounting part.

[0013] In one possible implementation, the first assembly part includes two opposing inclined outer walls, the distance between the two inclined outer walls gradually increasing in the light emission direction of the light source;

[0014] Multiple first fins are divided into two groups and arranged on opposite sides of the light source. The first fins on both sides are respectively set on the side of an inclined outer wall. The heat dissipation surface of the first fin on each side extends inclinedly and parallel to the inclined outer wall it corresponds to.

[0015] In one possible implementation, the distance between the first fin on the adjacent inclined outer wall and the inclined outer wall in the first fin on each side is d2, where d2 satisfies: 2mm≤d2≤8mm.

[0016] In one possible implementation, the housing assembly includes an optomechanical housing, which includes a first assembly part and a second assembly part that are internally fitted to form an optical channel. A light source is installed at the end of the first assembly part away from the second assembly part, and the first assembly part is flared in the light emission direction of the light source. The optomechanical body also includes an optical valve module, which is installed in the second assembly part.

[0017] Along the light emission direction, the free end of the first fin on each side away from the substrate is flush with the outer wall surface of the corresponding second assembly part.

[0018] In one possible implementation, the first assembly includes a straight section and a flared section connected to each other, the light source is installed at the end of the straight section away from the flared section, the flared section is connected to the second assembly, and the flared section is provided with an inclined outer wall; wherein, the root fin is adjacent to the outer wall of the straight section.

[0019] In one possible implementation, the housing assembly further includes a heat sink, and the second assembly part is provided with a heat conduction port communicating with the optical channel, with the heat sink covering the heat conduction port.

[0020] The optical engine body also includes an internal circulation fan. The optical valve module includes an optical valve and optical elements spaced apart from the optical valve along the light emission direction of the light source. Both the optical valve and the optical elements are in contact with the heat sink. The optical valve, the optical elements, part of the inner wall of the second assembly part and the heat sink cooperate to form an internal circulation air duct. The internal circulation fan is installed in the internal circulation air duct.

[0021] In one possible implementation, an external fan is also included, located outside the housing assembly and correspondingly positioned on one side of the heat sink, with the airflow from the external fan flowing sequentially through the heat sink and the radiator.

[0022] In one possible implementation, the housing assembly further includes a heat sink, and the second assembly part is provided with a heat conduction port communicating with the optical channel, with the heat sink covering the heat conduction port.

[0023] The optical engine body also includes an internal circulation fan. The optical valve module includes an optical valve and optical elements spaced apart from the optical valve along the light emission direction of the light source. Both the optical valve and the optical elements are in contact with the heat sink. The optical valve, the optical elements, part of the inner wall of the second assembly part and the heat sink cooperate to form an internal circulation air duct. The internal circulation fan is installed in the internal circulation air duct.

[0024] In one possible implementation, an external fan is located outside the housing assembly and is correspondingly positioned on one side of the heat sink, with the airflow from the external fan flowing sequentially through the heat sink and the radiator.

[0025] In one possible implementation, the heat dissipation shell includes a windward shell wall and two air guide shell walls connected to opposite sides of the windward shell wall. The windward shell wall is arranged facing the air outlet of the external fan, and the two air guide shell walls are respectively arranged corresponding to the first fins on both sides and extend toward the corresponding set of first fins.

[0026] The outer wall of the windward shell includes a windward surface corresponding to the opening area of ​​the air outlet of the external fan. The windward surface is inclined, and in the air outlet direction of the external fan, the end of the windward surface away from the second assembly part is closer to the light source.

[0027] In one possible implementation, along the rotation axis of the external fan, the orthographic projection of the first fin is at least partially located outside the orthographic projection of the air guide shell wall.

[0028] In one possible implementation, a plurality of first heat exchange ribs are also provided at intervals on the windward shell wall, and the first heat exchange ribs extend in the direction from the second assembly part to the first assembly part.

[0029] In one possible implementation, there is a circular arc transition between the windward shell wall and the guide shell wall.

[0030] In one possible implementation, the rotation axis of the internal circulation fan coincides with the rotation axis of the external fan;

[0031] The inner wall of the windward shell includes a flow-guiding surface that is opposite to the windward side. The flow-guiding surface is directly opposite the air inlet of the internal circulation fan, and the inclination angle of the flow-guiding surface is the same as that of the windward side.

[0032] In one possible implementation, the optical elements include heat-insulating glass, a first Fresnel lens, and a second Fresnel lens, wherein the first Fresnel lens, the heat-insulating glass, the light valve, and the second Fresnel lens are arranged sequentially at intervals in the light emission direction of the light source;

[0033] The first air duct is formed between the first Fresnel lens and the heat-insulating glass, the second air duct is formed between the heat-insulating glass and the light-incident surface of the light valve, and the third air duct is formed between the light-outceasing surface of the light valve and the second Fresnel lens. The third air duct is connected to one end of the first air duct and the second air duct.

[0034] The internal circulation fan is installed inside the heat dissipation shell, and the heat dissipation shell forms a return air duct and a supply air duct. The return air duct connects to the other end of the third air duct and the air inlet of the internal circulation fan, and the supply air duct connects to the air outlet of the internal circulation fan and the other end of the first air duct and the second air duct.

[0035] In one possible implementation, the air supply duct includes a first sub-duct and a second sub-duct arranged at intervals. The first sub-duct connects the air outlet of the internal circulation fan and the first air duct, and the second sub-duct connects the air outlet of the internal circulation fan and the second air duct.

[0036] In one possible implementation, the second assembly part includes a main body and an arc-shaped part. The main body is provided with a heat conduction port and a mounting port arranged opposite to the heat conduction port. The first Fresnel lens, the heat insulation glass, the light valve, and the second Fresnel lens are arranged adjacent to the mounting port on the side away from the heat sink.

[0037] The curved part covers the mounting opening and arches away from the heat sink housing;

[0038] An arc-shaped guide channel is defined between the inner wall of the arc-shaped part and the side of the light valve and the heat insulation glass away from the heat dissipation shell. The ends of the first air duct, the second air duct and the third air duct away from the heat dissipation shell are connected through the arc-shaped guide channel.

[0039] In one possible implementation, a second heat exchange rib is provided on the inner wall and / or the outer wall of the arc-shaped portion.

[0040] Thirdly, this application also provides a projector, including a housing and a projector optical engine as described above, with the housing assembly connected to the housing.

[0041] The heat sink, projector optical engine, and projector provided in this application increase the surface area of ​​the heat sink by arranging multiple first fins and multiple second fins on both sides of the substrate. This allows more heat to be transferred to the surrounding air through the first and second fins, thereby improving heat dissipation efficiency. Understandably, when the heat sink is applied to the projector optical engine, the heat source is a light source, and the substrate is in contact with the light source, meaning the substrate directly contacts the light source. This allows for rapid absorption of the heat generated by the light source, playing a direct heat conduction role and helping to evenly distribute heat from a localized area of ​​the light source to the entire surface of the heat sink. Furthermore, the first and second fins help guide airflow and increase airflow speed, thereby improving heat dissipation efficiency.

[0042] Furthermore, in this embodiment, the heat dissipation surface of the first fin closer to the heat source is longer. Since the thermal resistance is smaller when the heat is propagated to the first fin closer to the heat source, the first fin closer to the heat source in this application has a larger heat dissipation area, which can fully dissipate the heat outward.

[0043] When heat sinks are used in projector optical engines, in related technologies, heat dissipation fins are typically connected perpendicularly to the substrate and located on the side away from the light cup. Increasing their length increases the heat dissipation area, thereby improving heat dissipation efficiency. However, in this application, the first fin extends at a certain angle to the optical axis of the light source (heat source) and remains substantially parallel to the outer wall of the first mounting part. This matching allows the heat sink to fit more closely to the shape of the first mounting part, utilizing the limited space inside the projector and reducing the space occupied by the projector optical engine in the height direction. This allows the heat sink to provide a larger heat dissipation area without increasing the overall size.

[0044] Compared to the existing method of setting the first fin to extend vertically, while meeting the same heat dissipation requirements, the number of first fins can be reduced accordingly, and the first fins away from the light source are shorter. Therefore, the space occupied by the first fins on the outside of the projector optical engine is also reduced, making the structure of the entire projector optical engine more compact. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0046] Figure 1 A three-dimensional structural diagram of the heat sink and heat source provided in the embodiments of this application;

[0047] Figure 2 This is a three-dimensional structural diagram of the projector optical engine provided in an embodiment of this application;

[0048] Figure 3 An exploded view of the projector optical engine provided in the embodiments of this application;

[0049] Figure 4 This is a schematic diagram of the planar structure of the projector optical engine provided in an embodiment of this application;

[0050] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the AA direction;

[0051] Figure 6 A three-dimensional structural diagram of the heat dissipation shell in the projector optical engine provided in the embodiments of this application;

[0052] Figure 7 An exploded view of the heat sink in the projector optical engine provided in the embodiments of this application;

[0053] Figure 8 Another exploded view of the projector optical engine provided in the embodiments of this application;

[0054] Figure 9 This is another planar structural schematic diagram of the projector optical engine provided in the embodiments of this application;

[0055] Figure 10 for Figure 9 A schematic diagram of the cross-sectional structure along the BB direction.

[0056] Explanation of icon numbers:

[0057] 100. Projector optical engine; 100a. Internal circulation air duct;

[0058] 1. Heat source; 10. Light source;

[0059] 2. Optical engine body; 20. Housing assembly; 21. Optical engine housing; 21a. Optical channel; 211. First assembly part; 211a. Light transmission hole; 2111. Straight section; 2112a. Inclined outer wall; 2112. Flared section; 212. Second assembly part; 212a. Heat conduction port; 212b. First air duct; 212c. Second air duct; 212d. Third air duct; 212e. Mounting port; 2121. Main body; 2122. Arc-shaped part; 2122a. Arc 2122b, second heat exchange rib; 213, third assembly part; 2131, protrusion; 22, heat dissipation shell; 22a, return air duct; 22b, air supply duct; 22b1, first sub-air duct; 22b2, second sub-air duct; 221, main heat dissipation shell; 2211, windward shell wall; 2211a, windward surface; 2211b, airflow guiding surface; 2211c, first heat exchange rib; 2212, air guide shell wall; 222, partition; 2221, partition plate;

[0060] 30. Optical valve module; 31. Optical valve; 32. Optical element; 321. Heat-insulating glass; 322. First Fresnel lens; 323. Second Fresnel lens;

[0061] 40. Internal circulation fan;

[0062] 50. Heat sink; 51. Substrate; 52. First fin; 53. Root fin; 54. Second fin;

[0063] 60. Reflector; 70. External fan.

[0064] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0066] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0067] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0069] Please see Figure 1 , Figure 1 This is a three-dimensional structural diagram of a heat sink and a heat source provided in an embodiment of this application. As shown in the figure, this embodiment provides a heat sink 50 connected to a heat source 1. The heat sink 50 includes a substrate 51 and a plurality of first fins 52 connected to the substrate 51. The substrate 51 is used to abut against the heat source 1. The plurality of first fins 52 are spaced apart on the side of the substrate 51 facing the heat source 1, and a plurality of second fins 54 are spaced apart on the side of the substrate 51 away from the heat source 1. By providing a plurality of first fins 52 and a plurality of second fins 54 on both sides of the substrate 51, the surface area of ​​the heat sink 50 can be increased, allowing more heat to be transferred to the surrounding air through the first fins 52 and second fins 54, thereby improving heat dissipation efficiency. Furthermore, the first fins 52 and second fins 54 help guide airflow and increase airflow speed, thereby improving heat dissipation efficiency.

[0070] In this embodiment, multiple first fins 52 are distributed on both sides of the heat source 1. The multiple first fins 52 on each side are inclined away from the heat source 1, and the heat dissipation surface length of the multiple first fins 52 on each side increases along the direction from far to near the heat source 1. Since the thermal resistance is smaller when the heat is propagated to the first fin 52 closer to the heat source 1, the first fin 52 closer to the heat source 1 in this application has a larger heat dissipation area, so it can fully dissipate the heat outward.

[0071] It should be noted that there are multiple ways to increase the heat dissipation surface length of the multiple first fins 52 on each side. In one configuration, the heat dissipation surface length of the multiple first fins 52 on each side increases in a stepped manner, that is, two adjacent first fins 52 increase in length by the same increment. The stepped design simplifies the manufacturing process because the increment of each first fin 52 is consistent, which makes the production of the radiator 50 more standardized and easier to control in terms of quality.

[0072] In another configuration, the length of the heat dissipation surface of the multiple first fins 52 on each side increases non-stepwise. That is, the increase in length between two adjacent first fins 52 is different from that between other two adjacent first fins 52. For example, the length of the heat dissipation surface from one first fin 52 to the adjacent first fin 52 increases by 1 mm, while the length of the heat dissipation surface from the adjacent first fin 52 to the third fin of the next first fin 52 increases by 2 mm. This non-stepwise increase can be adjusted according to the specific heat distribution of the heat source 1, so that the heat dissipation area of ​​the first fins 52 is more adapted to the actual heat load, improving the efficiency of thermal management. Furthermore, it reduces the use of material for the first fins 52 in areas far from the heat source 1, thereby reducing costs and weight while maintaining heat dissipation performance.

[0073] The following section will discuss the heat dissipation effect of heat sink 50 in the projector optical engine 100.

[0074] This embodiment also provides a projector optical engine 100, please refer to [link to documentation]. Figure 2 and Figure 3 , Figure 2 This is a three-dimensional structural diagram of the projector optical engine provided in an embodiment of this application. Figure 3 The exploded view of the projector optical engine provided in this embodiment is shown in the figure. This embodiment provides a projector optical engine 100, including a light source 10, an optical engine body 2, and a heat sink 50 as described above. The optical engine body 2 includes a housing assembly 20, a light valve module 30, an internal circulation fan 40, and a reflector 60. The light source 10 provides the light required for projection. The emitted light passes through the light valve module 30 to form an image and is projected onto a screen or projection surface to display content. The brightness of the light source 10 directly affects the clarity and visibility of the projected image. A high-brightness light source 10 can provide a clear projection effect in brighter environments. The light source 10 can be an LED light panel. LED light panels can provide high-brightness light output while maintaining color saturation and accuracy. Moreover, LED light panels have higher energy efficiency than traditional light sources 10, which means that they consume less power while providing the same brightness, helping to reduce energy consumption and operating costs. Of course, in some other embodiments, the light source 10 can also be a laser lamp, etc. Here, the type of light source 10 is not specifically limited.

[0075] like Figure 2 As shown, the housing assembly 20 includes an optical engine housing 21 and a heat sink 22. The optical engine housing 21 can be made of plastic, which can reduce the overall weight of the projector optical engine 100. The heat sink 22 is made of extruded aluminum, which can improve the strength and hardness of the heat sink 22. The optical engine housing 21 and the heat sink 22 can be connected by screws, or they can be connected by snap-fit, adhesive or other means. This application does not limit this.

[0076] Further, please see Figure 3 , Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the planar structure of the projector optical engine provided in an embodiment of this application. Figure 5 for Figure 4 A cross-sectional view along the AA direction is shown. The optomechanical housing 21 includes a first assembly portion 211 and a second assembly portion 212, which internally form a light channel 21a. The second assembly portion 212 is located above the first assembly portion 211. A reflector 60 is disposed within the first assembly portion 211 and aligned with the light source 10. The shape of the reflector 60 is adapted to the shape of the first assembly portion 211. The reflector 60 is used to reflect the light from the light source 10. The reflector 60 can be a reflective film coated within the first assembly portion 211 or a housing structure embedded within the first assembly portion 211. In this embodiment, the reflector 60 is not specifically limited.

[0077] The projector optical engine 100 also includes a projection lens (not shown), and the optical engine housing 21 also includes a third assembly part 213. The third assembly part 213 is connected to the side of the second assembly part 212 opposite to the first assembly part 211. The first assembly part 211, the second assembly part 212, and the third assembly part 213 are arranged in an "L" shape, and the projection lens is disposed in the third assembly part 213. The third assembly part 213 includes a protrusion 2131 that is adapted to the shape of the projection lens and allows the projection lens to extend. A mounting space is formed between the first assembly part 211, the second assembly part 212, and the protrusion 2131. The heat sink 22 is located in the mounting space, achieving a compact arrangement of the projector optical engine 100.

[0078] The light source 10 is mounted on the end of the first assembly part 211 away from the second assembly part 212. For example, a receiving groove is formed on the side of the first assembly part 211 away from the second assembly part 212, and the light source 10 is installed in the receiving groove. A light-transmitting hole 211a is formed on the first assembly part 211 for the light emitted by the light source 10 to pass through. The first assembly part 211 is flared in the light-emitting direction of the light source 10. In this embodiment, ... Figure 5In the exemplary viewpoint, which faces upwards, the flared design helps to diffuse light and improve light efficiency. Furthermore, the flared shape reduces direct obstruction of the light emitted from the light source 10, maintaining light propagation efficiency, which is crucial for maintaining the brightness and clarity of the projected image.

[0079] In this embodiment, it is understood that the heat source 1 is the light source 10, and the heat sink 50 is located outside the first assembly part 211. The heat sink 50 can absorb the heat generated by the light source 10 and dissipate it into the surrounding environment to prevent the light source 10 from overheating and extend the service life of the light source 10.

[0080] The light valve module 30 is disposed within the second assembly section 212. The second assembly section 212 can protect the internal light valve module 30, reducing its exposure to environmental factors such as dust and moisture, and extending the service life of the light valve module 30. The light valve module 30 includes a light valve 31 and an optical element 32 spaced apart from the light valve 31 along the light emission direction of the light source 10. The light valve 31 can be an LCD. Of course, in some other embodiments, the light valve 31 can be a liquid crystal on silicon (LCoS), etc. Here, the type of light valve 31 is not specifically limited. Both the light valve 31 and the optical element 32 are located within the light channel 21a with the light source 10, which helps to maintain the accuracy of the light path, reduce optical distortion, and improve the clarity and quality of the projected image. Both the light valve 31 and the optical element 32 are in contact with the heat sink 22, which helps to quickly conduct heat, reduce heat accumulation, and protect the light valve module 30 from overheating damage. The heat sink 22 can also support the position of the light valve 31 and the optical element 32, increase the rigidity of the overall structure, reduce the optical path offset caused by vibration or temperature changes, and ensure the clarity and stability of the image.

[0081] Please continue reading. Figure 3 , Figure 4 and Figure 5The second assembly part 212 is provided with a heat conduction port 212a communicating with the light channel 21a. The heat dissipation shell 22 covers the heat conduction port 212a. The internal circulation fan 40 is housed in the heat dissipation shell 22. The light valve 31, the optical element 32, part of the inner wall of the second assembly part 212 and the heat dissipation shell 22 cooperate to form an internal circulation air duct 100a. That is, the internal circulation fan 40 is set in the internal circulation air duct 100a. Understandably, the airflow blown out by the internal circulation fan 40 can flow to the light valve 31 and the optical element 32 through the internal circulation air duct 100a, thereby removing the heat radiated to the light valve 31 and the optical element 32 during the operation of the projector. Since the light valve 31 and the optical element 32 are each in contact with the heat dissipation shell 22, the air duct branches between the light valve 31 and the optical element 32 are independent of each other and will not interfere with each other, which helps to avoid heat accumulation. Moreover, the airflow blown out by the internal circulation fan 40 can be evenly distributed to ensure that the light valve 31 and the optical element 32 can be adequately cooled.

[0082] like Figure 5 As shown, specifically, the optical element 32 includes a heat-insulating glass 321, a first Fresnel lens 322, and a second Fresnel lens 323. The first Fresnel lens 322, the heat-insulating glass 321, the light valve 31, and the second Fresnel lens 323 are arranged sequentially at intervals in the light-emitting direction of the light source 10. The function of the first Fresnel lens 322 is to initially focus the light emitted by the light source 10, thereby improving the utilization rate of light efficiency. The heat-insulating glass 321 can isolate the high-temperature heat generated by the light source 10, reducing its continued conduction to the light valve 31 on the upper side, thus protecting sensitive elements such as the light valve 31 from high-temperature damage. The second Fresnel lens 323 is used to refocus the light after it has been modulated by the light valve 31, ensuring that the image projected on the screen is clear. The heat-insulating glass 321, the first Fresnel lens 322, and the second Fresnel lens 323 each play an important role in the high-quality image projection of the projector optical engine 100.

[0083] Please continue reading. Figure 5The internal circulation fan 40 is installed inside the heat dissipation shell 22, and the heat dissipation shell 22 forms a return air duct 22a and a supply air duct 22b. Specifically, a first air duct 212b is formed between the first Fresnel lens 322 and the heat insulation glass 321, a second air duct 212c is formed between the heat insulation glass 321 and the light-incident surface of the light valve 31, and a third air duct 212d is formed between the light-out surface of the light valve 31 and the second Fresnel lens 323. The third air duct 212d is connected to the first air duct 212b. Since it is connected to one end of the second air duct 212c, it is understood that the airflow of the first air duct 212b and the second air duct 212c will converge in the third air duct 212d. By forming multiple air ducts, an effective heat dissipation path can be provided for the heat insulation glass 321, the first Fresnel lens 322, the light valve 31 and the second Fresnel lens 323. The heat can be quickly carried away in the first air duct 212b, the second air duct 212c and the third air duct 212d to prevent the temperature from rising and affecting its performance.

[0084] Furthermore, the return air duct 22a connects to the other end of the third air duct 212d and the air inlet of the internal circulation fan 40, and the supply air duct 22b connects to the air outlet of the internal circulation fan 40 and the other ends of the first air duct 212b and the second air duct 212c, so that the airflow blown out by the internal circulation fan 40 can flow into the first air duct 212b and the second air duct 212c in an orderly manner, and then converge into the third air duct 212d, and then be transmitted to the heat sink 22 through the return air duct 22a, forming a closed heat dissipation flow path.

[0085] Specifically, the air supply duct 22b includes a first sub-air duct 22b1 and a second sub-air duct 22b2 arranged at intervals. The first sub-air duct 22b1 connects the air outlet of the internal circulation fan 40 and the first air duct 212b, while the second sub-air duct 22b2 connects the air outlet of the internal circulation fan 40 and the second air duct 212c. The spaced arrangement of the first sub-air duct 22b1 and the second sub-air duct 22b2 can ensure that the airflow is evenly distributed in the first air duct 212b and the second air duct 212c, and can reduce the interference between airflows, so that the first air duct 212b and the second air duct 212c maintain a stable airflow state, thereby improving the heat dissipation performance.

[0086] Please see Figure 6 and Figure 7 , Figure 6 This is a three-dimensional structural diagram of the heat sink in the projector optical engine provided in an embodiment of this application. Figure 7This is an exploded view of the heat dissipation shell in the projector optical engine provided in this application embodiment; wherein, the heat dissipation shell 22 includes a partition 222 and a heat dissipation main shell 221 covering the partition 222. The two ends of the partition 222 are respectively connected to the second assembly part 212 and the internal circulation fan 40, and the aforementioned light valve 31, heat insulation glass 321 and first Fresnel lens 322 all abut against the partition 222. In this way, the heat carried on the light valve 31, heat insulation glass 321 and first Fresnel lens 322 can be directly transferred to the heat dissipation main shell 221 through the partition 222 to dissipate to the outside.

[0087] The separator 222 has the aforementioned air supply duct 22b. The two sides of the air supply duct 22b are connected to the air outlet and heat conduction port 212a of the internal circulation fan 40. The separator 222 has an arc-shaped separator plate 2221 to divide the air supply duct 22b into a first sub-air duct 22b1 and a second sub-air duct 22b2. One inner wall surface of the separator 222 is also an arc-shaped surface. The arc-shaped surface and the upper wall surface of the separator plate 2221 together form the second sub-air duct 22b2. The separator plate 2221 can ensure that there is enough airflow in the first air duct 212b. The arc-shaped separator plate 2221 and the arc-shaped surface of the separator 222 can provide a smooth airflow transition surface, reduce the turbulence and eddies generated by the airflow at the separator plate 2221, and reduce the impact of the airflow at the separator plate 2221, avoiding the airflow turbulence caused by the airflow directly impacting the separator plate 2221.

[0088] It is understandable that the heat dissipation shell 22 is configured as two parts, the main heat dissipation shell 221 and the partition 222, which is beneficial for manufacturing and forming the above-mentioned precision air duct structure. Of course, in other embodiments, the main heat dissipation shell 221 and the partition 222 can also be formed as an integral structure.

[0089] Please see Figure 8 , Figure 8 Another exploded view of the projector optical engine provided in this application embodiment is shown in the figure. To reduce turbulence at the connection between the first air duct 212b, the second air duct 212c, and the third air duct 212d, the second assembly part 212 includes a connected main body 2121 and an arc-shaped part 2122. The main body 2121 is provided with a heat conduction port 212a and a mounting port 212e opposite to the heat conduction port 212a. The first Fresnel lens 322, the heat insulation glass 321, the light valve 31, and the second Fresnel lens 323 are disposed adjacent to the mounting port 212e on the side away from the heat sink 22. The arc-shaped part 2122 covers the mounting port 212e and arches in the direction away from the heat sink 22. The inner wall of the arc-shaped part 2122 defines an arc-shaped guide channel 2122a between the light valve 31 and the side of the heat insulation glass 321 away from the heat sink 22 (e.g., Figure 5The ends of the first air duct 212b, the second air duct 212c, and the third air duct 212d furthest from the heat sink 22 are connected by an arc-shaped guide channel 2122a. This arc-shaped guide channel 2122a provides some clearance for airflow deflection, improving airflow smoothness and effectively guiding a stable transition, thereby reducing noise and increasing airflow efficiency. Furthermore, it avoids, to some extent, airflow collisions with the inner wall of the second assembly section 212 during deflection, preventing losses.

[0090] In other embodiments, the shape of the arc-shaped portion 2122 is not limited to an arc shape; it can also be rectangular, and the material used for the arc-shaped portion 2122 can be metal or plastic. Here, no specific limitations are placed on the shape and material of the arc-shaped portion 2122.

[0091] Of course, to further improve the heat dissipation effect of the projector optical engine 100, this embodiment also forms a heat dissipation airflow path on the outside of the projector optical engine 100. Please refer to Figure 9 and Figure 10 , Figure 9 This is another planar structural diagram of the projector optical engine provided in an embodiment of this application. Figure 10 for Figure 8 A schematic diagram of the planar structure along the BB direction. Figure 10 The arrows in the diagram indicate the direction of airflow. The projector optical engine 100 provided in this embodiment also includes an external fan 70 disposed on the outside of the housing assembly 20; the external fan 70 and the heat sink 50 are disposed on opposite sides of the heat sink housing 22. Specifically, the heat sink housing 22 has a first snap-fit ​​portion on the side facing the external fan 70, and the external fan 70 has a second snap-fit ​​portion adapted to the first snap-fit ​​portion. The external fan 70 is securely connected to the heat sink housing 22 through the second snap-fit ​​portion. Understandably, the first snap-fit ​​portion can be a protruding snap-fit ​​protrusion, and the second snap-fit ​​portion can be a snap-fit ​​hole. This application does not impose any limitations on this.

[0092] Furthermore, the airflow from the external fan 70 flows sequentially through the heat sink 22 and the radiator 50 to more effectively manage and dissipate the heat generated by the heat sink 22 and the radiator 50. The external fan 70 improves the heat dissipation efficiency of the heat sink 22 and the radiator 50 through forced convection. This prevents performance degradation or malfunction of the projector optical engine 100 due to overheating, thereby improving the stability and reliability of the projector optical engine 100.

[0093] Understandably, a projector's internal optical system, which employs a closed optical path and fixed optical elements 32, is called a closed-loop projector optical engine. Closed-loop projector optical engines are typically equipped with excellent heat dissipation devices, which can maintain a stable internal temperature while preventing external dust from entering. However, during the operation of the light source 10, not all electrical energy is converted into light energy; some is converted into heat. Furthermore, to provide sufficient brightness, the light source 10 needs to operate at higher power, resulting in significant heat generation at the light source 10. Poor heat dissipation at the light source 10 will affect the overall performance and lifespan of the projector optical engine 100. Heat accumulation not only reduces the efficiency of the light source 10, leading to brightness and color degradation, but may also accelerate its aging and increase the failure rate. In addition, overheating may cause deformation of the optical engine housing 21 connected to the light source 10, affecting the accuracy of the optical path and thus reducing image clarity and contrast. Therefore, effective heat dissipation at the light source 10 is crucial for maintaining the high performance of the projector optical engine 100 and extending its lifespan.

[0094] Currently, traditional enclosed projector optical engines primarily address light source heat dissipation by installing a heat sink. The heat sink is typically located at the bottom and consists of a base plate and several heat dissipation fins connected to it. The base plate rests against the light source, while the heat dissipation fins are vertically fixed to the base plate and extend away from the light source to form an effective heat dissipation surface. To achieve a larger heat dissipation area, the extension length of the heat dissipation fins can be increased. However, while increasing the extension length helps improve heat dissipation, it inevitably increases the vertical space occupied by the enclosed projector optical engine. This not only increases the overall height of the projector but also makes the enclosed projector optical engine appear less compact and refined due to the bulky structure of the heat sink. This design, to some extent, affects the portability and aesthetics of the projector, especially in the modern electronics market that emphasizes lightweight and compact designs, where this type of heat sink is somewhat inadequate.

[0095] In this application, while meeting the heat dissipation requirements of the light source 10, the space occupied by the heat sink 50 is reduced. Therefore, this application mainly focuses on improving the product structure of the heat sink 50. Specifically, as follows... Figures 2-4When the heat sink 50 is applied in the projector optical engine 100, the substrate 51 is installed and fitted with the first mounting part 211 and abuts against the light source 10. Multiple first fins 52 are spaced apart on the side of the substrate 51 facing the light source 10. Since the substrate 51 is in direct contact with the light source 10, it can quickly absorb the heat generated by the light source 10, playing a direct heat conduction role and helping to evenly distribute heat from a localized area of ​​the light source 10 to the entire surface of the heat sink 50. The first fins 52 increase the surface area of ​​the heat sink 50, allowing more heat conducted by the substrate 51 to be transferred to the surrounding air through the first fins 52. Furthermore, the first fins 52 help guide airflow and increase airflow speed, thereby improving heat dissipation efficiency.

[0096] Multiple first fins 52 are spaced apart on the side of the substrate 51 facing the reflector cup 60. These first fins 52 are distributed on both sides of the first mounting portion 211, and the heat dissipation surfaces of the first fins 52 are inclined in a manner substantially parallel to the outer wall surface of the first mounting portion 211 in the direction away from the substrate 51. That is, the first fins 52 are set at an angle to the optical axis of the light source 10, extending obliquely towards the second mounting portion 212 in a spaced-apart manner from the outer wall surface of the first mounting portion 211. Since the outer wall surface of the first mounting portion 211 of the optomechanical housing 21 is flared, the first fins 52 of the heat sink 50 can match this shape; that is, the first fins 52 can extend along the inclined surface of the flare. The first fins 52 of the heat sink 50 perfectly match this shape, extending cleverly along the inclined surface of the flare. This layout not only optimizes space utilization, but also allows multiple first fins 52 to effectively fill the empty area of ​​the first assembly part 211. It can be figuratively understood that the outer wall of the first assembly part 211 presents an flared shape, and multiple first fins 52 can fill the gap in this part, so that the connection between the first assembly part 211 and the heat sink 50 presents a more regular and square shape, achieving a compact and beautiful structure for the projection optical engine.

[0097] It should be noted that the basic parallel state in this embodiment refers to both the parallel state and the state that deviates slightly from the absolute parallel state. The deviation value can be set according to the actual situation.

[0098] This matching allows the heat sink 50 to fit more closely to the shape of the optical engine housing 21, making use of the limited space inside the projector and reducing the space occupied by the projector optical engine 100 in the vertical direction. This allows the heat sink 50 to provide a larger heat dissipation area without increasing the overall size.

[0099] The inclined arrangement of the first fin 52 not only matches the shape of the first assembly part 211, but also, along the direction from far to near relative to the light source 10, the length of the heat dissipation surface of the first fin 52 on one side of the first assembly part 211 and the length of the heat dissipation surface of the first fin 52 on the other side of the first assembly part 211 increase. The closer it is to the light source 10, the shorter the heat conduction path between it and the light source 10, reducing thermal resistance and making heat transfer more direct and rapid. The longer the length of the first fin 52, the closer it is to the light source 10, because during the heat propagation process, when the heat reaches the first fin 52 that is closer to the light source 10... The lower the thermal resistance, the larger the heat dissipation area of ​​the first fin 52 closer to the light source 10 in this application, thus fully dissipating heat outward. This arrangement makes full use of the outer peripheral space of the first assembly part 211. Compared with the existing arrangement of the first fin 52 in a vertically extending form, while meeting the same heat dissipation requirements, the number of first fins 52 can be reduced accordingly, and the first fin 52 further away from the light source 10 is shorter. Therefore, the space occupied by the first fin 52 on the outer side of the projector optical engine 100 is also reduced, making the structure of the entire projector optical engine 100 more compact.

[0100] Furthermore, to further enhance the heat dissipation capacity of the heat sink 50, the heat sink 50 also includes a plurality of second fins 54. These second fins 54 are connected to the substrate 51 and are spaced apart on the side of the substrate 51 facing away from the reflector cup 60, i.e., on the side of the substrate 51 facing away from the light source 10. By adding the second fins 54, the total heat dissipation area of ​​the heat sink 50 can be significantly increased, thereby improving heat exchange efficiency. This provides more surface area for contact with the surrounding air, enabling heat dissipation from the heat source (light source 10). Understandably, the second fins 54 can be straight fins or inclined fins. Straight fins are easier to process, while inclined fins can increase the turbulence of airflow, thereby improving heat dissipation efficiency. This application does not impose any limitations on this.

[0101] Therefore, this application provides a projector optical engine 100 with a compact heat sink 50 structure. Under the premise of meeting the heat dissipation requirements at the light source 10, the space occupied by the projector optical engine 100 in the vertical direction is reduced, making the overall structure of the projector optical engine 100 more compact. This is conducive to miniaturizing the projector optical engine 100 and making it easy to carry.

[0102] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0103] like Figure 4 and Figure 5As shown, the first assembly part 211 also includes a straight cylindrical section 2111 and a flared section 2112 connected to each other. The flared section 2112 is located above the straight cylindrical section 2111. The light source 10 is installed at the end of the straight cylindrical section 2111 away from the flared section 2112. The flared section 2112 is connected to the second assembly part 212. Understandably, the straight cylindrical section 2111 serves as the initial propagation channel for light, while the arrangement of the flared section 2112 helps to diffuse and distribute light. The first assembly part 211 also includes two oppositely arranged inclined outer walls 2112a, that is, the flared section 2112 is provided with inclined outer walls 2112a. The distance between the two inclined outer walls 2112a gradually increases from the light emission direction, which helps to match the divergence characteristics of the light source 10, optimize the light propagation path, and reduce light loss. As the distance in the light emission direction increases, the flared structure provides more space for the first fin 52 of the heat sink 50, so that the first fin 52 can extend more effectively. In particular, the first fin 52 located near the inclined outer wall 2112a has a longer extension length and can form a larger heat dissipation surface. Understandably, the first fin 52 located near the inclined outer wall 2112a is also located near the light source 10, which can enhance the heat dissipation effect on the light source 10.

[0104] It should be noted that the rotation axis of the external fan 70 is located between the two inclined outer walls 2112a, that is, the external fan 70 and the first assembly part 211 are correspondingly arranged. On the one hand, this layout provides a harmonious appearance, making the arrangement of the external fan 70 and the first assembly part 211 more compact; on the other hand, it improves the efficiency of the airflow of the external fan 70 through the radiator 50, and the airflow can be guided to the radiator 50 more directly, reducing the loss in the airflow path.

[0105] The multiple first fins 52 are divided into two groups, which are respectively arranged on opposite sides of the light source 10, so that both sides of the light source 10 can be effectively dissipated, avoiding heat accumulation on one side. The first fins 52 on both sides are respectively arranged on the side of an inclined outer wall 2112a, so that the side space of the two inclined outer walls 2112a can be effectively utilized, and for the heat sink 50, it can provide a larger heat dissipation area within the effective space.

[0106] It should be noted that the plurality of first fins 52 on each side are arranged at intervals in the direction away from the light source 10. Understandably, the plurality of first fins 52 can be arranged with equal or unequal spacing, and this application does not impose any limitation on this. The spacing between two adjacent first fins 52 is d1 (e.g., ...). Figure 4The condition d1 satisfies 2mm≤d1≤8mm, which can promote the flow of air between multiple first fins 52, reduce airflow resistance, improve heat dissipation efficiency, and ensure that there is sufficient gap between adjacent first fins 52 to prevent heat from accumulating between adjacent first fins 52 and maintain the heat dissipation performance of the first fins 52.

[0107] And the distance between the first fin 52 closest to the inclined outer wall 2112a and the inclined outer wall 2112a is d2 (e.g. Figure 4 The distance d2 between the first fin 52 and the inclined outer wall 2112a is 2mm ≤ d2 ≤ 8mm. When the distance is less than 2mm, the air layer between the first fin 52 and the inclined outer wall 2112a is too thin, which increases the thermal resistance and affects the heat transfer of the first fin 52 to the surrounding environment. When the distance is greater than 8mm, the space outside the inclined outer wall 2112a is not fully utilized, and the number of each group of first fins 52 that can be arranged in this space will also be reduced accordingly, resulting in a decrease in the heat dissipation area and thus affecting the heat dissipation effect. Therefore, 2mm ≤ d2 ≤ 8mm helps to achieve effective heat transfer and dissipation in a limited space.

[0108] Furthermore, the heat dissipation surface of the first fin 52 on each side extends obliquely to its corresponding inclined outer wall 2112a in a substantially parallel manner. This substantially parallel extension of the first fin 52 to the inclined outer wall 2112a allows for more efficient use of space, reduces the need for additional space, and makes the design more compact. The substantially parallel arrangement of the first fin 52 to the inclined outer wall 2112a also enhances the visual appeal, presenting a neat and orderly aesthetic and contributing to the improved appearance design of the projector optical engine 100.

[0109] In one configuration, in the direction away from the light source 10 (meaning extending from the center of the light source 10 towards both ends), the lengths of the multiple first fins 52 on each side decrease sequentially. The first fin 52 closest to the light source 10 is the longest and has the highest heat dissipation efficiency, while the outermost first fin 52, although the shortest, is the farthest from the light source 10. This design of decreasing lengths of the multiple first fins 52 in each group ensures that heat is gradually dispersed from the center of the light source 10 to the outside, thereby achieving uniform heat distribution and efficient heat transfer throughout the entire heat sink 50. This optimizes the overall heat dissipation efficiency of the heat sink 50, making use of limited space and allowing the heat sink 50 to maintain a compact structure without compromising its heat dissipation performance.

[0110] In another configuration, the thickness of the multiple first fins 52 on each side decreases sequentially in the arrangement direction away from the light source 10. Understandably, the first fins 52 are thicker when closer to the light source 10, and gradually decrease in thickness as they move further away from the light source 10. That is, near the heat source (light source 10), the temperature gradient is large, requiring thicker first fins 52 to enhance heat conduction and improve heat dissipation efficiency. As the distance increases, the temperature gradient decreases, allowing for the use of thinner first fins 52. This reduces the overall weight of the radiator 50 and saves materials while maintaining a certain heat dissipation effect.

[0111] To optimize the use of external space in the optical engine housing 21, along the light emission direction, the free ends of the multiple first fins 52 on each side away from the substrate 51 are flush with the outer wall of the corresponding second mounting part 212. Understandably, the first fins 52 on both sides are flush with the outer wall of the corresponding second mounting part 212 above, making the heat sink 50 more compact in space and not exceeding the outline of the main body 2121 of the projector optical engine 100. This is beneficial to the overall compactness and aesthetics of the projector optical engine 100, and can maximize the use of available space, ensuring heat dissipation efficiency without increasing the overall size of the projector optical engine 100.

[0112] In addition, the radiator 50 also includes two root fins 53 corresponding to the first fins 52 on both sides. The root fins 53 are connected to the substrate 51 and extend toward the second assembly part 212. The root fins 53 are directly connected to the substrate 51, which can quickly transfer heat. The root fins 53 are located near the heat source 1, that is, near the outer wall of the straight section 2111, so that the shape of the radiator 50 is more in line with the shape of the first assembly part 211.

[0113] Among the multiple first fins 52 on each side, at least two first fins 52 are connected to the root fin 53. The root fin 53 can provide additional support for the first fins 52 connected to it, enhance the overall structural stability of the radiator 50, and reduce the deformation of the first fins 52 caused by external impact.

[0114] To reduce thermal resistance near the heat source (light source 10), the thickness of the substrate 51 gradually decreases from the middle of the connection to the light source 10 towards both ends, making it easier for heat to be conducted from the light source 10 to the first fin 52 and improving the efficiency of heat conduction. The design of the substrate 51, which is thicker in the middle and thinner at both ends, can reduce the amount of material used while maintaining structural strength, and also helps to reduce the overall weight of the heat sink 50, which is beneficial for the application of portable projector optical engine 100.

[0115] Please continue reading. Figure 4Specifically, the substrate 51 has two inclined surfaces on which the first fin 52 and the second fin 54 are respectively provided. The inclined surfaces are set at an angle α with the reference surface perpendicular to the optical axis of the light source 10, where α satisfies 0° < α ≤ 5°. When α is greater than 5°, the excessively large tilt angle will reduce the structural strength of the substrate 51, increase the risk of deformation due to thermal expansion or mechanical stress, and may also cause stress concentration at the connection point of the substrate 51, leading to breakage of the substrate 51. Therefore, setting 0° < α ≤ 5° allows the substrate 51 to maintain good thermal conductivity while also maintaining sufficient structural strength.

[0116] like Figure 6 and Figure 7 As shown, in some embodiments, the heat dissipation shell 22 includes a windward shell wall 2211 and two air guide shell walls 2212 connected to opposite sides of the windward shell wall 2211. The windward shell wall 2211 is arranged facing the air outlet of the external fan 70, that is, the external fan 70 can blow directly onto the windward shell. The two air guide shell walls 2212 are respectively arranged corresponding to the first fins 52 on both sides and extend toward the corresponding set of first fins 52. The air guide shell walls 2212 do not expand to both sides to reduce unnecessary space occupation and effectively guide the airflow of the external fan 70 to act directly on the first fins 52, thereby improving heat dissipation efficiency.

[0117] The outer wall of the windward casing 2211 includes a windward surface 2211a corresponding to the opening area of ​​the air outlet of the external fan 70. The windward surface 2211a is inclined, which helps to guide the airflow from the external fan 70 and reduce wind resistance. Furthermore, in the airflow direction of the external fan 70, the end of the windward surface 2211a away from the second assembly part 212 is closer to the light source 10, allowing the airflow to flow along the windward surface 2211a towards the light source 10, dissipating heat near the light source 10, while not occupying too much space in the lateral direction.

[0118] In one configuration, the rotation axis of the internal circulation fan 40 coincides with that of the external fan 70. Understandably, although the internal circulation fan 40 and the external fan 70 are separated by a heat sink 22, their coincident rotation axes facilitate the design of an optimized airflow path. For example, the airflow from the external fan 70 can smoothly reach the windward wall 2211 of the heat sink 22, allowing the airflow in the return air duct 22a to undergo heat exchange through the heat sink 22, while the internal circulation fan 40 can effectively draw in air cooled by the heat sink 22.

[0119] The inner wall of the windward shell 2211 includes a guide surface 2211b that is opposite to the windward surface 2211a. The guide surface 2211b is directly opposite the air inlet of the internal circulation fan 40, and the tilt angle of the guide surface 2211b is the same as the tilt angle of the windward surface 2211a. That is, the end of the guide surface 2211b away from the second assembly part 212 is closer to the light source 10. On the one hand, this helps to guide the airflow in the return air duct 22a to transition smoothly, ensuring that the airflow flows to the air inlet of the internal circulation fan 40, thereby improving the efficiency of the internal circulation fan 40. On the other hand, the airflow in the return air duct 22a will turn when it flows along the guide surface 2211b, and the convective heat transfer coefficient of the guide surface 2211b will be increased, reducing the temperature difference between the outside air and the guide surface 2211b. After cooling, the airflow enters the air supply duct 22b through the internal circulation fan 40.

[0120] like Figure 5 and Figure 9 As shown, specifically, along the vertical direction, the tilt angle of the airflow guiding surface 2211b and the tilt angle of the windward surface 2211a are both β, where β satisfies 0° < β ≤ 45°. When β is greater than 45°, due to the excessive tilt angle, the adhesion of the airflow on the airflow guiding surface 2211b decreases, causing the airflow to not flow tightly against the airflow guiding surface 2211b and easily separating on the airflow guiding surface 2211b, reducing the heat exchange efficiency with the external air. Furthermore, a large tilt angle also affects the stability of the structure; under wind pressure or vibration, the structure is prone to deformation or damage. The condition that β satisfies 0° < β ≤ 45° helps the airflow to better adhere to the airflow guiding surface 2211b, reducing airflow separation, thereby reducing resistance and improving heat exchange efficiency. Through the configuration in this embodiment, the temperature difference between the heat dissipation shell 22 and the external environment can be kept below 10°C.

[0121] It should be noted that the rounded transition between the windward shell wall 2211 and the air guide shell wall 2212 allows the airflow blown out by the external fan 70 to smoothly transition from the windward shell wall 2211 to the air guide shell wall 2212, reducing the generation of turbulence and eddies, which helps the airflow to flow more smoothly and improves the flow efficiency of the airflow.

[0122] Furthermore, along the rotation axis of the external fan 70, the orthographic projection of the first fin 52 is at least partially located outside the orthographic projection of the air guide shell wall 2212, so that more of the first fin 52 can be directly exposed to the airflow generated by the external fan 70, increasing the airflow at the first fin 52 and thus improving the heat dissipation efficiency.

[0123] like Figure 7As shown, further, the windward shell wall 2211 is also provided with a plurality of first heat exchange ribs 2211c at intervals. The first heat exchange ribs 2211c extend from the second assembly part 212 in the direction pointing towards the first assembly part 211. The first heat exchange ribs 2211c can be provided on the windward surface 2211a or the airflow guiding surface 2211b. The first heat exchange ribs 2211c extending in the vertical direction also provide additional structural strength, enhance the structural stability of the windward shell wall 2211, and make it more pressure-resistant and durable. When provided on the windward surface 2211a, it can increase the contact area with the airflow blown out by the external fan 70, thereby improving the efficiency of heat conduction; when provided on the airflow guiding surface 2211b, it can increase the contact area between the airflow in the heat dissipation shell 22 and the return air duct 22a, thereby improving the efficiency of heat exchange. Understandably, the first heat exchange rib 2211c is disposed on the heat dissipation main shell 221. The heat dissipation main shell 221 also has the windward shell wall 2211 and the air guide shell wall 2212. The first heat exchange rib 2211c can also be arranged on the airflow guiding surface 2211b, which will not be described in detail here.

[0124] Similar to the above, such as Figure 8 As shown, a second heat exchange rib 2122b is provided on the inner wall and / or outer wall of the arc-shaped portion 2122. Multiple second heat exchange ribs 2122b can be provided. Multiple second heat exchange ribs 2122b extend in the vertical direction and are arranged at intervals. Providing second heat exchange ribs 2122b can increase the heat exchange area, allowing more heat to be transferred to the passing airflow through the second heat exchange ribs 2122b, thereby improving heat dissipation efficiency and enhancing the structural stability of the arc-shaped portion 2122.

[0125] This embodiment also provides a projector, including a housing (not shown in the figure) and a projector optical engine 100 as described in the above embodiments. The housing assembly 20 is connected to the housing, and the housing provides a robust structural support for the projector optical engine 100, ensuring the stability of the internal components during use. The structure of the projector optical engine 100 has been described in detail in the above embodiments and will not be repeated here.

[0126] It should be noted that a bracket can also be installed inside the casing, on which the aforementioned external fan 70 can be mounted. Of course, the projector provided in this embodiment also includes other modules such as circuit boards; however, these other modules will not be described in detail here.

[0127] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0128] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A radiator, characterized in that, The device includes a substrate, a plurality of first fins and a plurality of second fins connected to the substrate. The substrate is used to abut against a heat source. The plurality of first fins are spaced apart on the side of the substrate facing the heat source, and the plurality of second fins are spaced apart on the side of the substrate away from the heat source. The plurality of first fins are distributed on both sides of the heat source, and the plurality of first fins on each side are inclined away from the heat source. The length of the heat dissipation surface of the plurality of first fins on each side increases in the direction from far to near the heat source.

2. The radiator as described in claim 1, characterized in that, Multiple first fins on each side are distributed at equal or non-equal intervals; Furthermore, the distance between two adjacent first fins in the plurality of first fins on each side is d1, wherein d1 satisfies: 2mm≤d1≤8mm.

3. The radiator as described in claim 1, characterized in that, In the arrangement direction away from the heat source, the thickness of the plurality of first fins on each side is set to decrease sequentially.

4. The radiator as described in claim 1, characterized in that, The radiator also includes two root fins respectively disposed corresponding to the plurality of first fins on both sides. The root fins are connected to the substrate and disposed adjacent to the heat source. In each of the plurality of first fins on each side, at least two first fins are connected to the root fin.

5. The radiator as described in claim 1, characterized in that, The thickness of the substrate is gradually reduced from the middle part connected to the heat source toward both ends; The substrate is provided with two inclined surfaces on the first fin and the second fin, respectively. The inclined surfaces are set at an angle α with the horizontal extension direction of the substrate, and the α satisfies: 0°<α≤5°.

6. A projector optical engine, characterized in that, include: light source; Optical engine body; the optical engine body includes a housing assembly and a reflector, the housing assembly includes a first assembly part adapted to install the reflector, the light source is aligned and installed with the reflector, and the reflector is used to reflect the light from the light source; as well as According to any one of claims 1 to 5, a plurality of the first fins are distributed on both sides of the first assembly portion, and the heat dissipation surfaces of the plurality of first fins are inclined in a substantially parallel manner to the outer wall surface of the first assembly portion.

7. The projector optical engine as described in claim 6, characterized in that, The first assembly part includes two oppositely arranged inclined outer walls, and the distance between the two inclined outer walls gradually increases in the light emission direction of the light source; The first fins are divided into two groups and arranged on opposite sides of the light source. The first fins on both sides are respectively arranged on the side of the inclined outer wall. The heat dissipation surface of the first fin on each side extends obliquely in a substantially parallel manner with the inclined outer wall corresponding to it.

8. The projector optical engine as described in claim 7, characterized in that, The distance between the first fin on each side and the inclined outer wall is d2, where d2 satisfies: 2mm≤d2≤8mm.

9. The projector optical engine as described in claim 7, characterized in that, The housing assembly includes an optical engine housing, which includes a first assembly part and a second assembly part that are internally fitted to form an optical channel. The light source is installed at the end of the first assembly part away from the second assembly part, and the first assembly part is flared in the light emission direction of the light source. The optical engine body also includes an optical valve module, which is installed in the second assembly part. Along the light emission direction, the free end of the first fin on each side away from the substrate is flush with the outer wall surface of the corresponding second assembly part.

10. The projector optical engine as described in claim 9, characterized in that, The first assembly part includes a straight cylindrical section and a flared section connected to each other. The light source is installed at the end of the straight cylindrical section away from the flared section. The flared section is connected to the second assembly part and is provided with the inclined outer wall. The root fins of the radiator are connected to the substrate, and the root fins are disposed adjacent to the outer wall of the straight cylindrical section.

11. The projector optical engine as described in claim 9, characterized in that, The housing assembly further includes a heat dissipation shell, and the second assembly part is provided with a heat conduction port communicating with the optical channel, and the heat dissipation shell covers the heat conduction port; The optical engine body also includes an internal circulation fan. The optical valve module includes an optical valve and an optical element spaced apart from the optical valve along the light emission direction of the light source. The optical valve and the optical element are both in contact with the heat sink. The optical valve, the optical element, part of the inner wall of the second assembly part and the heat sink cooperate to form an internal circulation air duct. The internal circulation fan is disposed in the internal circulation air duct.

12. The projector optical engine as described in claim 11, characterized in that, Also includes: An external fan is located outside the housing assembly and is correspondingly disposed on one side of the heat dissipation shell. The airflow blown out by the external fan flows sequentially through the heat dissipation shell and the radiator.

13. The projector optical engine as described in claim 12, characterized in that, The heat dissipation shell includes a windward shell wall and two air guide shell walls connected to opposite sides of the windward shell wall. The windward shell wall is arranged facing the air outlet of the external fan. The two air guide shell walls are respectively arranged corresponding to the first fins on both sides and extend toward the corresponding set of the first fins. The outer wall of the windward shell includes a windward surface corresponding to the opening area of ​​the air outlet of the external fan. The windward surface is inclined, and in the air outlet direction of the external fan, the end of the windward surface away from the second assembly part is closer to the light source.

14. The projector optical engine as described in claim 13, characterized in that, Along the rotation axis of the external fan, the orthographic projection of the first fin is at least partially located outside the orthographic projection of the air guide shell wall.

15. The projector optical engine as described in claim 13, characterized in that, The windward shell wall is also provided with a plurality of first heat exchange ribs at intervals, and the first heat exchange ribs extend in the direction of the second assembly part toward the first assembly part.

16. The projector optical engine as described in claim 13, characterized in that, The windward shell wall and the air guide shell wall have a rounded transition.

17. The projector optical engine as described in claim 13, characterized in that, The rotation axis of the internal circulation fan coincides with the rotation axis of the external fan; The inner wall surface of the windward shell includes a flow-guiding surface that is opposite to the windward surface. The flow-guiding surface is directly opposite the air inlet of the internal circulation fan, and the inclination angle of the flow-guiding surface is the same as the inclination angle of the windward surface.

18. The projector optical engine as described in claim 11, characterized in that, The optical element includes heat-insulating glass, a first Fresnel lens, and a second Fresnel lens, wherein the first Fresnel lens, the heat-insulating glass, the light valve, and the second Fresnel lens are arranged sequentially at intervals in the light emission direction of the light source; Wherein, a first air duct is formed between the first Fresnel lens and the heat-insulating glass, a second air duct is formed between the heat-insulating glass and the light-incident surface of the light valve, and a third air duct is formed between the light-out surface of the light valve and the second Fresnel lens, and the third air duct is connected to one end of the first air duct and the second air duct. The internal circulation fan is installed inside the heat dissipation shell, and a return air duct and a supply air duct are formed inside the heat dissipation shell. The return air duct connects to the other end of the third air duct and the air inlet of the internal circulation fan, and the supply air duct connects to the air outlet of the internal circulation fan and the other end of the first air duct and the second air duct.

19. The projector optical engine as described in claim 18, characterized in that, The air supply duct includes a first sub-air duct and a second sub-air duct arranged at intervals. The first sub-air duct connects the air outlet of the internal circulation fan and the first air duct, and the second sub-air duct connects the air outlet of the internal circulation fan and the second air duct.

20. The projector optical engine as described in claim 18, characterized in that, The second assembly part includes a main body and an arc-shaped part. The main body is provided with the heat conduction port and the mounting port opposite to the heat conduction port. The first Fresnel lens, the heat insulation glass, the light valve and the second Fresnel lens are disposed adjacent to the mounting port on the side away from the heat dissipation shell. The arc-shaped portion covers the mounting opening and arches away from the heat dissipation shell; An arc-shaped guide channel is defined between the inner wall of the arc-shaped portion and the side of the light valve and the heat insulation glass away from the heat dissipation shell. The first air duct, the second air duct and the third air duct are connected at the ends away from the heat dissipation shell through the arc-shaped guide channel.

21. The projector optical engine as described in claim 20, characterized in that, A second heat exchange rib is provided on the inner wall and / or outer wall of the arc-shaped part.

22. A projector, characterized in that, It includes a housing and a projector optical engine as described in any one of claims 6 to 21, wherein the housing assembly is connected to the housing.

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