Air volume distribution control structure, projection light machine and projection device

Abstract

The embodiment of the present application provides a kind of air volume distribution control structure, projection light machine and projection equipment, it is related to projection technical field.The air volume distribution control structure includes first fixed plate, second fixed plate and at least two wind guide vanes;First fixed plate and the second fixed plate are oppositely arranged, and first fixed plate and the second fixed plate are limited to wind guide air duct;One end of wind guide vane is connected with the first fixed plate, and the other end of wind guide vane is connected with second fixed plate, and adjacent two wind guide vanes are spaced apart in wind guide air duct, and wind guide air duct is divided to form multiple sub-air ducts.The air volume distribution control structure of the present application can realize the distribution of air volume by forming wind guide air duct between first fixed plate and second fixed plate, and adjacent two wind guide vanes are spaced apart in wind guide air duct, and wind guide air duct is divided to form multiple sub-air ducts.In addition, it is conducive to improving the stability of wind guide vane in wind guide air duct, and further improving the stability of the air volume distribution control structure in the present application.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to an airflow distribution control structure, a projection optical engine, and a projection device. Background Technology

[0002] The projection optical engine is the core of the projection equipment's optical imaging, used to convert light emitted from a light source into a projectable image. During the operation of the projection optical engine, the optical components in the optical path system generate a large amount of heat. If this heat is not dissipated in time, it may damage the optical components and affect the lifespan of the projection optical engine.

[0003] To improve heat dissipation for optical components, air ducts are installed within the projector optical engine to cool them. Fans drive the airflow within these ducts to dissipate heat from the optical components. However, different optical components in the optical path system have varying heat dissipation requirements, and some components with higher heat dissipation demands experience inadequate cooling or high power consumption within the projector optical engine. To address this issue, related technologies incorporate integrated airflow guide vanes on the projector's housing. These vanes distribute the airflow towards different optical components for more precise cooling. However, in this design, the end of the airflow guide vane facing away from the housing (i.e., the cantilever end) extends near the optical component, causing the end of the vane near the optical component to wobble and exhibit poor stability, while also presenting maintenance challenges. Utility Model Content

[0004] This application provides an airflow distribution control structure, a projection optical engine, and a projection device, aiming to solve the problems of poor stability or inconvenience in maintenance of existing heat dissipation structures.

[0005] The first aspect of this application provides an air volume distribution control structure, including: a first fixed plate, a second fixed plate, and at least two guide vanes;

[0006] The first fixing plate and the second fixing plate are arranged opposite to each other, and an air guide duct is defined between the first fixing plate and the second fixing plate;

[0007] The at least two guide vanes are disposed between the first fixed plate and the second fixed plate. One end of the guide vane is fixedly connected to the first fixed plate, and the other end of the guide vane is fixedly connected to the second fixed plate. Two adjacent guide vanes are spaced apart in the air duct, and the air duct is divided into multiple sub-ducts.

[0008] The airflow passes through the air guide duct and then flows out through the multiple sub-ducts.

[0009] In some embodiments of this application, the at least two guide vanes include a first vane and a second vane; the first vane, the second vane, the first fixing plate, and the second fixing plate are integrally formed.

[0010] In some embodiments of this application, a first trajectory line is formed at the connection between the first blade and the first fixing plate, and a second trajectory line is formed at the connection between the second blade and the first fixing plate. A first through hole is provided on the first fixing plate, and the first trajectory line and the second trajectory line form at least a partial outline of the first through hole. The first through hole communicates with the sub-duct formed between the first blade and the second blade.

[0011] And / or, a first trajectory line is formed at the connection between the first blade and the second fixed plate, a second trajectory line is formed at the connection between the second blade and the second fixed plate, a second through hole is provided on the second fixed plate, the first trajectory line and the second trajectory line form at least a partial outline of the second through hole, and the second through hole communicates with the sub-duct formed between the first blade and the second blade.

[0012] In some embodiments of this application, at least some of the guide vanes are arc-shaped;

[0013] And / or, two adjacent guide vanes are arranged in parallel;

[0014] And / or, at least one of the planes of the air guide vanes is perpendicular to the plane of the first fixed plate;

[0015] And / or, at least one of the planes of the air guide vanes is perpendicular to the plane of the second fixed plate.

[0016] In some embodiments of this application, along the extending direction of the air duct, one end of the air guide blade protrudes from the first fixing plate and / or the second fixing plate.

[0017] In some embodiments of this application, the air volume distribution control structure further includes at least one reinforcing rib, which is disposed between the first fixed plate and the second fixed plate and connected to at least one of the air guide vanes.

[0018] In some embodiments of this application, the air volume distribution control structure is an injection-molded integral structural component.

[0019] A second aspect of this application provides a projection optical engine, which includes a fan and the aforementioned airflow distribution control structure, wherein the airflow distribution control structure is disposed at the air outlet of the fan.

[0020] In some embodiments of this application, the projection optical engine further includes an optical path system, and the airflow distribution control structure is used to guide the airflow blown out of the air outlet of the fan to the optical path system, and to direct the airflow flowing out from the plurality of sub-air ducts to different positions of the optical path system.

[0021] In some embodiments of this application, the optical path system includes a first Fresnel lens, a first polarizer, an LCD screen, and a second polarized light arranged sequentially at intervals along the optical axis. A first heat dissipation channel is formed between the first Fresnel lens and the first polarizer, a second heat dissipation channel is formed between the first polarizer and the LCD screen, and a third heat dissipation channel is formed between the LCD screen and the second polarized light. The plurality of sub-air channels include a first sub-air channel, a second sub-air channel, and a third sub-air channel arranged at intervals. The first sub-air channel is connected to the first heat dissipation channel; the second sub-air channel is connected to the second heat dissipation channel; and the third sub-air channel is connected to the third heat dissipation channel.

[0022] A third aspect of this application provides a projection device, including the aforementioned projection optical engine.

[0023] The airflow distribution control structure of this application includes: a first fixed plate, a second fixed plate, and at least two guide vanes; the first fixed plate and the second fixed plate are arranged opposite to each other, defining an airflow duct between them; one end of each guide vane is connected to the first fixed plate, and the other end of each guide vane is connected to the second fixed plate; adjacent guide vanes are spaced apart within the airflow duct, dividing the airflow duct into multiple sub-ducts; wherein, the airflow exits through the multiple sub-ducts after passing through the airflow duct. In this application, by forming an airflow duct between the first and second fixed plates, and by spaced apart adjacent guide vanes within the airflow duct, dividing the airflow duct into multiple sub-ducts, airflow distribution can be achieved; furthermore, the two ends of the guide vanes located within the airflow duct are fixedly connected to the first and second fixed plates respectively, which helps improve the stability of the guide vanes within the airflow duct, thereby improving the stability of the airflow distribution control structure of this application.

[0024] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort.

[0026] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0027] Figure 1 This is a schematic diagram of the air volume distribution control provided in an exemplary embodiment of this application;

[0028] Figure 2 yes Figure 1 A schematic diagram of the structure for controlling the distribution of stroke volume from another perspective;

[0029] Figure 3 This is a schematic diagram of the projection optical engine provided in an exemplary embodiment of this application;

[0030] Figure 4 This is an exploded structural diagram of the projection optical engine provided in an exemplary embodiment of this application;

[0031] Figure 5 yes Figure 3 A schematic diagram of the cross-section at point AA.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Projection optical engine; 10. Air volume distribution control structure; 11. First fixing plate; 111. First through hole; 12. Second fixing plate; 112. Second through hole; 131. First blade; 132. Second blade; 14. Air duct; 141. First sub-duct; 142. Second sub-duct; 143. Third sub-duct; 151. Lamp board; 152. Optical cup; 153. First Fresnel lens; 154. First polarizer; 155. LCD screen; 156. Second polarized light; 157. Second Fresnel lens; 158. Reflector; 159. Lens module; 16. Fan; 17. Reinforcing rib; 181. Upper housing; 182. Lower housing; 191. Top heat sink; 192. Bottom heat sink. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0035] A projection optical engine is a display device that magnifies and projects images or videos onto a screen or wall, widely used in homes, offices, education, entertainment, and other fields. The core of the optical imaging in a projection optical engine is the projector itself. It converts light emitted from a light source into a projectable image. During operation, the optical components in the optical path system generate a significant amount of heat. If this heat is not dissipated in time, it can damage the optical components and shorten the lifespan of the projection optical engine.

[0036] To improve heat dissipation for optical components, air ducts are installed within the projector optical engine to cool them. Fans drive the airflow within these ducts to dissipate heat from the optical components. However, different optical components in the optical path system have varying heat dissipation requirements, and some components with higher heat dissipation demands experience inadequate cooling or high power consumption within the projector optical engine. To address this issue, related technologies incorporate integrated airflow guide vanes on the projector's housing. These vanes distribute the airflow towards different optical components for more precise cooling. However, in this design, the end of the airflow guide vane facing away from the housing (i.e., the cantilever end) extends near the optical component, causing the end of the vane near the optical component to wobble and exhibit poor stability, while also presenting maintenance challenges.

[0037] In view of this, the present application provides a novel airflow distribution control structure, which forms an airflow duct through a first fixed plate and a second fixed plate. Two adjacent airflow guide blades are spaced apart in the airflow guide duct, and the airflow guide duct is divided into multiple sub-ducts. The two ends of the airflow guide blades located in the airflow guide duct are fixedly connected to the first fixed plate and the second fixed plate, respectively. Thus, the airflow distribution control structure in the present application can realize airflow distribution and has high stability.

[0038] To facilitate understanding, the projection optical engine and projection device in this application will be further described below with reference to specific embodiments and accompanying drawings.

[0039] Please see Figures 1 to 5 This application provides an airflow distribution control structure 10, including: a first fixing plate 11, a second fixing plate 12, and at least two guide vanes. The first fixing plate 11 and the second fixing plate 12 are arranged opposite to each other. It should be noted that the first fixing plate 11 and the second fixing plate 12 need to have a certain structural strength, and are mainly used for installing and fixing the at least two guide vanes in this application. The structure of the first fixing plate 11 is not limited and can be square, circular, trapezoidal, etc., and is not limited here. Similarly, the structure of the second fixing plate 12 is not limited and can be the same as or different from the first fixing plate 11. Exemplarily, the first fixing plate 11 and the second fixing plate 12 are symmetrically arranged.

[0040] In this embodiment, an air guide duct 14 is defined between the first fixing plate 11 and the second fixing plate 12. It should be noted that defining the air guide duct 14 between the first fixing plate 11 and the second fixing plate 12 means that there is a channel between the first fixing plate 11 and the second fixing plate 12 that allows airflow to pass through. This channel can be an annular channel formed by the first fixing plate 11 and the second fixing plate 12, or it can be an annular channel formed by the first fixing plate 11, the second fixing plate 12, and the housing at the outlet of the fan 16; no limitation is made here. For example, the first fixing plate 11 and the second fixing plate 12 are square plates facing each other. In this embodiment, the airflow distribution control structure 10 is disposed within the air outlet of the fan 16, and the first fixing plate 11, the second fixing plate 12, and part of the housing at the air outlet enclose and form an annular channel.

[0041] In this embodiment, at least two guide vanes are disposed between the first fixed plate 11 and the second fixed plate 12. One end of each guide vane is fixedly connected to the first fixed plate 11, and the other end is fixedly connected to the second fixed plate 12. It should be noted that the at least two guide vanes disposed between the first fixed plate 11 and the second fixed plate 12 can mean that all the guide vanes are located between the first fixed plate 11 and the second fixed plate 12, or that only a portion of the guide vane structure (e.g., the middle section of the guide vane) is disposed between the first fixed plate 11 and the second fixed plate 12; this is not limited here. The fixed connection of one end of the guide vane to the first fixed plate 11 and the other end to the second fixed plate 12 can mean that the guide vane is stationary relative to the first fixed plate 11 and / or the second fixed plate 12, or that the guide vane can also move (e.g., rotate) relative to the first fixed plate 11 and / or the second fixed plate 12; this is not limited here. Unless otherwise specified, the following examples are all based on the premise that the air guide blades are fixed relative to the first fixed plate 11 and the second fixed plate 12 (that is, the air guide blades cannot move relative to the first fixed plate 11 or the second fixed plate 12).

[0042] In this embodiment, two adjacent guide vanes are spaced apart within the air duct, dividing the air duct into multiple sub-ducts. Airflow passes through the air duct 14 and exits through these sub-ducts. For example, the airflow distribution control structure 10 is located at the outlet of the fan 16, such as a generally rectangular outlet. A first fixing plate 11 and a second fixing plate 12 are located at opposite ends of the outlet's length. Guide vanes located between the first and second fixing plates 11 and 12 also extend along the outlet's length. Multiple guide vanes located between the first and second fixing plates 11 and 12 are spaced apart along the outlet's width. These guide vanes divide the air duct 14 into multiple independent sub-ducts. Airflow from the fan 16 outlet passes through these sub-ducts, forming multiple sub-airflows. These sub-airflows can then dissipate heat from different objects, thus improving the heat dissipation effect.

[0043] The airflow distribution control structure 10 in this embodiment includes a first fixed plate 11, a second fixed plate 12, and at least two guide vanes. The first fixed plate 11 and the second fixed plate 12 are arranged opposite to each other, and an airflow duct 14 is defined between the first fixed plate 11 and the second fixed plate 12. One end of each guide vane is connected to the first fixed plate 11, and the other end of each guide vane is connected to the second fixed plate 12. Two adjacent guide vanes are spaced apart within the airflow duct 14, dividing the airflow duct 14 into multiple sub-ducts. The airflow passes through the airflow duct 14 and then flows out through the multiple sub-ducts. In this application, an air duct 14 is formed between the first fixed plate 11 and the second fixed plate 12. Two adjacent air guide blades are spaced apart in the air duct 14, and the air duct 14 is divided into multiple sub-ducts, thereby achieving air volume distribution. In addition, the two ends of the air guide blades located in the air duct 14 are fixedly connected to the first fixed plate 11 and the second fixed plate 12 respectively, which helps to improve the stability of the air guide blades in the air duct 14, thereby improving the stability of the air volume distribution control structure 10 in this application.

[0044] In some embodiments of this application, the at least two guide vanes include a first vane 131 and a second vane 132; the first vane 131, the second vane 132, the first fixing plate 11, and the second fixing plate 12 are integrally formed. This is beneficial for further improving the structural strength and stability of the airflow distribution control structure 10 in this application. Exemplarily, the airflow distribution control structure 10 is an injection-molded integral structural component.

[0045] In some embodiments of this application, a first trajectory line is formed at the connection between the first blade 131 and the first fixing plate 11, and a second trajectory line is formed at the connection between the second blade 132 and the first fixing plate 11. The first fixing plate 11 has a first through hole 111. The first trajectory line and the second trajectory line form at least a portion of the outline of the first through hole 111. The first through hole 111 communicates with the sub-duct formed between the first blade 131 and the second blade 132. Thus, when the airflow distribution control structure 10 in this application is manufactured using an injection molding process, the core mold can be pulled out from the molded airflow distribution control structure 10 through the first through hole 111, which helps reduce demolding difficulty and improves the manufacturing process.

[0046] In some embodiments of this application, a first trajectory line is formed at the connection between the first blade 131 and the second fixing plate 12, and a second trajectory line is formed at the connection between the second blade 132 and the second fixing plate 12. The second fixing plate 12 is provided with a second through hole 112. The first trajectory line and the second trajectory line form at least a partial outline of the second through hole 112, and the second through hole 112 communicates with the sub-air duct formed between the first blade 131 and the second blade 132. Thus, when the airflow distribution control structure 10 in this application is manufactured by injection molding, the core mold can be pulled out from the molded airflow distribution control structure 10 through the second through hole 112, which helps to reduce demolding difficulty and improve production efficiency.

[0047] For example, the first trajectory line and the second trajectory line are arc-shaped and parallel to each other. This helps to further reduce the difficulty of the manufacturing process.

[0048] In some embodiments of this application, at least some of the guide vanes are arc-shaped. For example, the cross-section of the guide vane (perpendicular to the plane in which the guide vane is located) is arc-shaped. Thus, the direction of airflow into the air duct 14 can be changed by altering the guide vane, thereby achieving a change in airflow direction.

[0049] In some embodiments of this application, two adjacent guide vanes are arranged in parallel. This helps to improve the stability of airflow through the airflow distribution control structure 10, reduce losses, and reduce the manufacturing difficulty of the airflow distribution control structure 10 in this application.

[0050] In some embodiments of this application, at least one of the planes of the guide vanes is perpendicular to the plane of the first fixing plate 11. Exemplarily, the plane of each guide vane is perpendicular to the plane of the first fixing plate 11. This helps to further improve the structural strength of the airflow distribution control structure 10 and reduces the difficulty of the manufacturing process.

[0051] In some embodiments of this application, at least one of the planes of the guide vanes is perpendicular to the plane of the second fixing plate 12. Exemplarily, the plane of each guide vane is perpendicular to the plane of the second fixing plate 12. This helps to further improve the structural strength of the airflow distribution control structure 10 and reduces the difficulty of the manufacturing process.

[0052] In some embodiments of this application, along the extending direction of the air duct 14, one end of the air guide blade protrudes beyond the first fixing plate 11 and / or the second fixing plate 12. Exemplarily, the air duct 14 has an air outlet side, and the end of the air guide blade located on the air outlet side protrudes beyond the first fixing plate 11 and / or the second fixing plate 12. Specifically, the air guide blade protrudes beyond the first fixing plate 11 and the second fixing plate 12. Thus, the portion of the air guide blade protruding beyond the first fixing plate 11 and the second fixing plate 12 can be closer to the object to be cooled (e.g., an optical path system), which helps to increase the effective length of the air duct 14 and improve the heat dissipation effect.

[0053] In some embodiments of this application, the airflow distribution control structure 10 further includes at least one reinforcing rib 17, which is disposed between the first fixing plate 11 and the second fixing plate 12 and connected to at least one of the guide vanes. Exemplarily, the reinforcing rib 17 is fixedly connected to each guide vane, and the plane of the reinforcing rib 17 is perpendicular to the guide vane. This improves the connection strength at the middle position of the guide vane, further enhancing the structural stability of the airflow distribution control structure 10 in this application.

[0054] A second aspect of this application provides a projection optical engine 1, which includes a fan 16 and an airflow distribution control structure 10, wherein the airflow distribution control structure 10 is disposed at the air outlet of the fan 16. Thus, by providing the airflow distribution control structure 10 of this application at the air outlet of the fan 16, the airflow blown from the air outlet can be distributed to allocate different airflow volumes according to different heat dissipation requirements, thereby improving heat dissipation efficiency.

[0055] In some embodiments of this application, the projection optical engine 1 further includes an optical path system. The airflow distribution control structure 10 is used to guide the airflow blown from the outlet of the fan 16 to the optical path system, and to direct the airflow from the plurality of sub-air ducts to different positions of the optical path system. Thus, by distributing the airflow from the outlet through the plurality of sub-air ducts of the airflow distribution control structure 10, and directing the distributed airflow to different positions of the optical path system, the heat dissipation efficiency of the optical path system is improved.

[0056] In some embodiments of this application, the optical path system includes a first Fenwick lens 153, a first polarizer 154, an LCD screen 155, and a second polarized light 156 arranged sequentially at intervals along the optical axis. A first heat dissipation channel is formed between the first Fenwick lens 153 and the first polarizer 154; a second heat dissipation channel is formed between the first polarizer 154 and the LCD screen 155; and a third heat dissipation channel is formed between the LCD screen 155 and the second polarized light 156. The plurality of sub-channels include a first sub-channel, a second sub-channel, and a third sub-channel arranged at intervals. The first sub-channel is connected to the first heat dissipation channel; the second sub-channel is connected to the second heat dissipation channel; and the third sub-channel is connected to the third heat dissipation channel. This is beneficial for further improving the heat dissipation effect of the optical path system.

[0057] For example, the optical path system includes a lamp plate 151, an optical reflector 152, a first Fresnel lens 153, a first polarizer 154, an LCD screen 155, a second polarized light source 156, a second Fresnel lens 157, a reflector 158, and a lens module 159, arranged sequentially at intervals along the optical axis. It should be noted that the lamp plate 151, optical reflector 152, first Fresnel lens 153, first polarizer 154, LCD screen 155, second polarized light source 156, second Fresnel lens 157, reflector 158, and lens module 159 are not major improvements of this application and will not be elaborated upon here.

[0058] In some embodiments of this application, the projection optical engine 1 further includes an upper housing 181, a lower housing 182, a top heat sink 191, and a bottom heat sink 192. The upper housing 181 and the lower housing 182 are connected to form the outer casing of the projection optical engine 1, and the optical path system is disposed within the outer casing. The top heat sink 191 is fixed to the upper housing 181, and the bottom heat sink 192 is fixed to the lower housing 182.

[0059] In some embodiments of this application, the top heat sink 191 is provided with a heat sink channel, which is connected to the first heat sink channel, the second heat sink channel and the third heat sink channel respectively. Exemplarily, the airflow blown out of the fan 16 outlet flows sequentially through the air volume distribution control structure 10, the optical path system, the heat sink channel, the air duct inside the housing and the air inlet of the fan 16.

[0060] According to a third aspect of this application, a projection device is provided, which includes the aforementioned projection optical engine. This projection device possesses all the beneficial effects of the aforementioned projection optical engine, which will not be elaborated further herein.

[0061] In some embodiments, the projection device includes an LCD projection engine (liquid crystal projection engine), a DLP projection engine (digital light processing projection engine), an LCoS projection engine (liquid crystal on silicon projection engine), etc.

[0062] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0063] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0064] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0065] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An airflow distribution control structure (10), characterized in that, include: The first fixed plate (11), the second fixed plate (12), and at least two guide vanes; The first fixing plate (11) and the second fixing plate (12) are arranged opposite to each other, and an air guide duct (14) is defined between the first fixing plate (11) and the second fixing plate (12); The at least two guide vanes are disposed between the first fixed plate (11) and the second fixed plate (12). One end of the guide vane is fixedly connected to the first fixed plate (11), and the other end of the guide vane is fixedly connected to the second fixed plate (12). Two adjacent guide vanes are spaced apart in the air duct (14), and the air duct (14) is divided into multiple sub-ducts. The airflow passes through the air guide duct (14) and then flows out through the multiple sub-ducts.

2. The air volume distribution control structure (10) as described in claim 1, characterized in that, The at least two guide vanes include a first vane (131) and a second vane (132); the first vane (131), the second vane (132), the first fixing plate (11) and the second fixing plate (12) are integrally formed.

3. The air volume distribution control structure (10) as described in claim 2, characterized in that, A first trajectory line is formed at the connection between the first blade (131) and the first fixing plate (11), and a second trajectory line is formed at the connection between the second blade (132) and the first fixing plate (11). A first through hole (111) is provided on the first fixing plate (11). The first trajectory line and the second trajectory line form at least a partial outline of the first through hole (111). The first through hole (111) communicates with the sub-duct formed between the first blade and the second blade. And / or, a first trajectory line is formed at the connection between the first blade (131) and the second fixing plate (12), and a second trajectory line is formed at the connection between the second blade (132) and the second fixing plate (12). A second through hole (112) is provided on the second fixing plate (12). The first trajectory line and the second trajectory line form at least a partial outline of the second through hole (112). The second through hole (112) communicates with the sub-duct formed between the first blade (131) and the second blade (132).

4. The air volume distribution control structure (10) as described in claim 1, characterized in that, At least some of the guide vanes are arc-shaped; And / or, two adjacent guide vanes are arranged in parallel; And / or, at least one of the planes of the air guide vanes is perpendicular to the plane of the first fixed plate (11); And / or, at least one of the planes of the air guide vanes is perpendicular to the plane of the second fixed plate (12); And / or, along the extension direction of the air duct (14), one end of the air guide blade protrudes from the first fixing plate (11) and / or the second fixing plate (12).

5. The airflow distribution control structure (10) as described in any one of claims 1 to 4, characterized in that, The air volume distribution control structure (10) further includes at least one reinforcing rib (17), which is disposed between the first fixing plate (11) and the second fixing plate (12) and is connected to at least one of the air guide blades.

6. The airflow distribution control structure (10) as described in any one of claims 1 to 4, characterized in that, The air volume distribution control structure (10) is an injection-molded integral structural component.

7. A projection optical engine (1), characterized in that, The projection optical engine (1) includes a fan (16) and an air volume distribution control structure (10) as described in any one of claims 1 to 6, wherein the air volume distribution control structure (10) is disposed at the air outlet of the fan (16).

8. The projection optical engine (1) as described in claim 7, characterized in that, The projection optical engine (1) also includes an optical path system. The air volume distribution control structure (10) is used to guide the airflow blown out of the air outlet of the fan (16) to the optical path system and to blow the airflow from the multiple sub-air ducts to different positions of the optical path system.

9. The projection optical engine (1) as described in claim 8, characterized in that, The optical path system includes a first Fenwick lens (153), a first polarizer (154), an LCD screen (155), and a second polarized light (156) arranged sequentially at intervals along the optical axis. A first heat dissipation channel is formed between the first Fenwick lens (153) and the first polarizer (154), a second heat dissipation channel is formed between the first polarizer (154) and the LCD screen (155), and a third heat dissipation channel is formed between the LCD screen (155) and the second polarized light (156). The plurality of sub-channels include a first sub-channel (141), a second sub-channel (142), and a third sub-channel (143) arranged at intervals. The first sub-channel (141) is connected to the first heat dissipation channel; the second sub-channel (142) is connected to the second heat dissipation channel; and the third sub-channel (143) is connected to the third heat dissipation channel.

10. A projection device, characterized in that, Includes the projection optical engine (1) as described in any one of claims 7 to 9.

Images