Color wheel heat dissipation device and projection light source

Abstract

The utility model provides a color wheel heat dissipation device and a projection light source, a color wheel is provided with a peripheral surface and a light inlet surface and a light outlet surface which are oppositely arranged, the peripheral surface is connected with the light inlet surface and the light outlet surface to jointly define the color wheel, and the color wheel heat dissipation device comprises a light machine shell, a shell extension boss, a heat conduction metal ring and an annular cooler; the color wheel is rotationally connected with the light machine shell and is positioned in the heat-conducting metal ring; the shell extension boss is arranged on the inner wall of the ray machine shell; the heat-conducting metal ring and the annular cooler surround the peripheral surface; the annular cooler is located between the heat conduction metal ring and the shell extending boss. The projection light source comprises a color wheel and a color wheel heat dissipation device arranged around the color wheel. According to the color wheel, the heat conduction metal ring is located between the annular cooler and the color wheel, the heat conduction metal ring is in a relatively low-temperature state, high-temperature turbulent flow formed by rotation of the color wheel can still have the large flow speed near the heat conduction metal ring, distribution is uniform, the turbulent flow can fully exchange heat with the heat conduction metal ring, and the heat dissipation effect of the color wheel is improved.

Description

Technical Field

[0001] The present application belongs to the field of laser projection technology, and more specifically, relates to a color wheel heat dissipation device and a projection light source. Background Art

[0002] As a key component in laser projection systems, the color wheel is compact, has a high heat flux, and often experiences high temperatures. However, color wheel performance is significantly negatively correlated with temperature. Furthermore, with the advancement of laser projection technology, the thermal environment in which the color wheel operates is becoming increasingly harsh. Therefore, an efficient and feasible color wheel heat dissipation solution is urgently needed.

[0003] To address the issue of excessive color wheel temperature, existing technical solutions mainly include: 1. Selecting high thermal conductivity materials to reduce the thermal resistance of each component and the contact thermal resistance between components, thereby optimizing the system's heat dissipation characteristics; 2. Adding spoilers to a substrate that rotates coaxially with the color wheel and is closely connected to it, thereby increasing the contact area between the color wheel and the air and generating turbulence that can improve the system's heat dissipation performance.

[0004] The first solution has been widely developed and applied, but its development space is relatively limited. Under the second solution, on the one hand, the rotation speed of the substrate and spoiler is directly affected by the color wheel, making it difficult to flexibly control and adjust. On the other hand, due to the motor performance and the size of the color wheel optical machine, the design optimization space of this solution is also relatively limited, making it difficult to meet the heat dissipation requirements of the high-power color wheel. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a color wheel heat dissipation device and a projection light source to solve the technical problem of poor heat dissipation effect in the prior art when dealing with high-heat-power color wheels.

[0006] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a color wheel heat dissipation device for dissipating heat of the color wheel, the color wheel having a light inlet surface, a light outlet surface and an outer peripheral surface, the light inlet surface is arranged opposite to the light outlet surface, the outer peripheral surface connects the light inlet surface and the light outlet surface to jointly define the color wheel, the color wheel heat dissipation device includes an optical machine housing, a shell extension boss, a heat-conducting metal ring and an annular cooler; the color wheel is rotatably connected in the optical machine housing; the shell extension boss is arranged on the inner wall of the optical machine housing; the heat-conducting metal ring is arranged around the color wheel, and the color wheel is located in the heat-conducting metal ring; the annular cooler is arranged around the color wheel, and the annular cooler is located between the heat-conducting metal ring and the shell extension boss.

[0007] Optionally, the color wheel heat dissipation device further includes a first elastic heat-conducting ring and / or a second elastic heat-conducting ring, wherein the first elastic heat-conducting ring is located between the shell extension boss and the annular cooler; and the second elastic heat-conducting ring is located between the annular cooler and the heat-conducting metal ring.

[0008] Optionally, the shell extension boss is integrally formed on the inner surface of the optical engine housing.

[0009] Optionally, the inner surface of the shell extension boss is annular, and the inner surface of the shell extension boss is arranged around the outer peripheral surface; the symmetry axis of the axial section of the shell extension boss coincides with the symmetry axis of the axial section of the color wheel; the axial length of the shell extension boss is greater than the axial length of the color wheel.

[0010] Optionally, the symmetry axis of the axial cross section of the heat-conducting metal ring coincides with the symmetry axis of the axial cross section of the color wheel; and the axial length of the heat-conducting metal ring is greater than the axial length of the color wheel.

[0011] Optionally, a groove is provided on the outer surface of the heat-conducting metal ring, and the annular cooler is located in the groove.

[0012] Optionally, a through hole is provided in the radial direction of the heat-conducting metal ring, and a fastener is provided in the through hole to connect with the extension boss of the shell.

[0013] Optionally, the symmetry axis of the axial cross section of the annular cooler coincides with the symmetry axis of the axial cross section of the color wheel; and the axial length of the annular cooler is greater than the axial length of the color wheel.

[0014] Optionally, the annular cooler is an annular TEC, the inner surface of the annular cooler is a cold surface, and the outer surface of the annular cooler is a hot surface; the input parameters of the annular TEC can be changed to adjust the cooling effect of the annular TEC.

[0015] The present application also provides a projection light source, which includes a color wheel and the above-mentioned color wheel heat dissipation device; the color wheel heat dissipation device is arranged around the color wheel.

[0016] The color wheel heat dissipation device and projection light source provided by the present application have the following beneficial effects: Compared with the prior art, in the present application, the heat-conducting metal ring is located between the annular cooler and the color wheel, and the heat-conducting metal ring is kept at a relatively low temperature. On the one hand, the high-temperature turbulent energy generated by the rotation of the color wheel still has a relatively high flow rate near the heat-conducting metal ring and is relatively evenly distributed, so that the turbulent energy and the heat-conducting metal ring can fully exchange heat, thereby improving the heat dissipation effect of the color wheel. On the other hand, the radiant energy of the color wheel will be efficiently absorbed by the heat-conducting metal ring, and this heat will be conducted to the surface of the optical machine housing through the extended boss of the shell and ultimately carried away by the external airflow. Therefore, the present application can effectively reduce the temperature of the color wheel, thereby effectively solving the problem of excessive color wheel temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 A schematic diagram of a right-side cross-sectional structure of a color wheel heat dissipation device provided in an embodiment of the present application;

[0019] Figure 2 This is a schematic front cross-sectional structural diagram of a color wheel heat dissipation device provided in an embodiment of the present application.

[0020] Among them, the reference numerals in the figures are:

[0021] 1- Optical machine housing;

[0022] 2-shell extension boss;

[0023] 3-first elastic heat-conducting ring;

[0024] 4-annular cooler;

[0025] 5- second elastic heat-conducting ring;

[0026] 6- Color wheel;

[0027] 7-heat-conducting metal ring;

[0028] 8-rotation axis;

[0029] 9- Fasteners. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0031] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0034] Please also refer to Figure 1 and Figure 2 The color wheel heat dissipation device provided in an embodiment of the present application is now described. The color wheel heat dissipation device is used to dissipate heat from the color wheel. The color wheel 6 has a light inlet surface 61, a light outlet surface 62, and an outer peripheral surface. The light inlet surface 61 and the light outlet surface 62 are arranged opposite to each other, and the outer peripheral surface connects the light inlet surface 61 and the light outlet surface 62 to jointly define the color wheel 6. The color wheel heat dissipation device includes an optical engine housing 1, a housing extension boss 2, a heat-conducting metal ring 7, and an annular cooler 4. The color wheel 6 is rotatably connected within the optical engine housing 1. The housing extension boss 2 is arranged on the inner wall of the optical engine housing 1. The heat-conducting metal ring 7 is arranged around the color wheel 6, and the color wheel 6 is located within the heat-conducting metal ring 7. The annular cooler 4 is arranged around the color wheel 6, and the annular cooler 4 is located between the heat-conducting metal ring 7 and the housing extension boss 2.

[0035] Compared to the prior art, the color wheel heat dissipation device provided in the embodiment of the present application has a heat-conducting metal ring 7 located between the annular cooler 4 and the color wheel 6. This heat-conducting metal ring 7 is kept at a relatively low temperature. On the one hand, the high-temperature turbulent energy generated by the rotation of the color wheel 6 maintains a relatively high flow rate near the heat-conducting metal ring 7 and is relatively evenly distributed, allowing the turbulent energy to fully exchange heat with the heat-conducting metal ring 7, thereby improving the heat dissipation effect of the color wheel 6. On the other hand, the radiated energy of the color wheel 6 is efficiently absorbed by the heat-conducting metal ring 7. This heat is then conducted to the surface of the optical machine housing 1 through the housing extension boss 2 and ultimately carried away by the external airflow. Therefore, the present application can effectively reduce the temperature of the color wheel 6, thereby effectively solving the problem of overheating the color wheel 6.

[0036] In one embodiment of this application, please refer to Figure 1 and Figure 2 The color wheel heat dissipation device further includes a first elastic heat-conducting ring 3 , which is located between the housing extension boss 2 and the annular cooler 4 .

[0037] In this embodiment, by providing a first elastic heat-conducting ring 3, the assembly gap between the shell extension boss 2 and the annular cooler 4 can be filled, effectively coping with a larger range of component processing tolerances, and can significantly reduce the thermal resistance of the color wheel heat dissipation device, improve the efficiency of heat conduction, and thereby improve the heat dissipation effect of the color wheel 6.

[0038] It is understood that, due to the certain elasticity of the first elastic heat-conducting ring 3, it can fit tightly between the housing extension boss 2 and the annular cooler 4, forming a more intimate contact surface. This close contact facilitates heat conduction, allowing the annular cooler 4 to more efficiently absorb and dissipate heat from the color wheel 6.

[0039] Furthermore, the first elastic heat-conducting ring 3 also has a certain shock-absorbing effect. During the high-speed rotation of the color wheel 6, some vibration may be generated. The first elastic heat-conducting ring 3 can absorb and mitigate these vibrations, protecting the annular cooler 4 and the housing extension boss 2 from damage, thereby improving the stability and reliability of the entire heat dissipation device.

[0040] In one embodiment of this application, please refer to Figure 1 and Figure 2 The color wheel heat dissipation device may further include a second elastic heat-conducting ring 5 , which is located between the annular cooler 4 and the heat-conducting metal ring 7 .

[0041] In this embodiment, the addition of a second elastic heat-conducting ring 5 further fills the assembly gap between the annular cooler 4 and the heat-conducting metal ring 7, improving heat conduction efficiency and heat dissipation. Similar to the first elastic heat-conducting ring 3, the second elastic heat-conducting ring 5 also has a certain degree of elasticity and shock absorption, which can cope with the vibration generated by the rotation of the color wheel 6, protect various components from damage, and enhance the stability of the overall color wheel heat dissipation device.

[0042] Specifically, the addition of the second elastic heat-conducting ring 5 creates closer contact between the annular cooler 4 and the heat-conducting metal ring 7, thereby promoting rapid heat transfer. This close contact not only enhances heat conduction efficiency but also ensures even heat distribution, preventing localized overheating. Furthermore, the shock-absorbing function of the second elastic heat-conducting ring 5 provides a strong guarantee for the stable operation of the heat dissipation device even at high speeds.

[0043] In this embodiment, both the first elastic thermally conductive ring 3 and the second elastic thermally conductive ring 5 are made of a material with high elasticity, high viscosity, and high thermal conductivity, such as silicone or thermally conductive rubber, to ensure efficient heat conduction while maintaining good elasticity. This material selection allows the elastic thermally conductive rings to fill assembly gaps while effectively transferring heat, improving overall heat dissipation performance.

[0044] In one embodiment of the present application, the housing extension boss 2 is integrally formed and disposed on the inner surface of the optical engine housing 1 .

[0045] In this embodiment, the housing extension boss 2 is integrally molded with the optical engine housing 1. This not only simplifies assembly but also strengthens the connection between the housing extension boss 2 and the optical engine housing 1, making the overall structure more stable. Furthermore, this integral design reduces the thermal resistance that can arise from excessive connecting components, fully utilizing the larger surface area of ​​the optical engine housing 1 to enhance heat dissipation and further improve the heat dissipation effect. By optimizing the structural design of the housing extension boss 2, this application not only ensures heat dissipation performance but also improves the overall quality and reliability of the product.

[0046] In one embodiment of this application, please refer to Figure 1 and Figure 2 The inner surface of the shell extension boss 2 is annular, and the inner surface of the shell extension boss 2 is arranged around the outer peripheral surface of the color wheel 6; the symmetry axis of the axial cross-section of the shell extension boss 2 coincides with the symmetry axis of the axial cross-section of the color wheel 6; the axial length of the shell extension boss 2 is greater than the axial length of the color wheel 6.

[0047] This design ensures that the housing's extended boss 2 completely covers the color wheel 6, effectively directing heat transfer from the color wheel 6 to the surface of the optical engine housing 1. Furthermore, the inner surface of the housing's extended boss 2, which surrounds the outer circumference of the color wheel 6 and has a greater axial length than the color wheel 6, helps create a more uniform heat conduction path in the axial direction, reducing heat loss during transfer and further improving heat dissipation efficiency. This design also helps improve the stability of the heat dissipation device by preventing the centrifugal force generated by the rotation of the color wheel 6 from adversely affecting the heat dissipation effect.

[0048] The axis of the heat-conducting metal ring 7, the axis of the annular cooler 4 and the axis of the outer peripheral surface of the color wheel 6 may or may not coincide with each other; the heat-conducting metal ring 7 and the annular cooler 4 only need to surround the outer peripheral surface of the color wheel 6. In this embodiment, the axes preferably coincide with each other. Figure 2 In the figure, X1 can simultaneously represent the axis of the inner surface of the shell extension boss 2, the axis of the first elastic heat-conducting ring 3, the axis of the annular cooler 4, the axis of the second elastic heat-conducting ring 5, the axis of the outer peripheral surface of the color wheel 6, and the axis of the heat-conducting metal ring 7, and the six lines are combined into one.

[0049] In one embodiment of the present application, see Figure 2 The symmetry axis of the axial cross section of the heat-conducting metal ring 7 coincides with the symmetry axis of the axial cross section of the color wheel 6 ; the axial length of the heat-conducting metal ring 7 is greater than the axial length of the color wheel 6 .

[0050] In this embodiment, the symmetry axis of the axial cross-section of the heat-conducting metal ring 7 coincides with the symmetry axis of the axial cross-section of the color wheel 6; the axial length of the heat-conducting metal ring 7 is greater than the axial length of the color wheel 6, which can increase the angular coefficient of the surface of the color wheel 6 to the heat-conducting metal ring 7, significantly reducing the radiation heat exchange thermal resistance between the heat-conducting metal ring 7 and the color wheel 6, thereby further reducing the temperature of the color wheel 6.

[0051] In one embodiment of the present application, a groove is provided on the outer surface of the heat-conducting metal ring 7 , and the annular cooler 4 is installed in the groove.

[0052] In this embodiment, the groove provides positioning support for the annular cooler 4, making the contact between the annular cooler 4 and the heat-conducting metal ring 7 more stable and less likely to loosen or shift, further ensuring the efficiency and stability of heat conduction. At the same time, the groove design can also increase the heat dissipation area of ​​the annular cooler 4 to a certain extent, improving its heat dissipation effect.

[0053] In one embodiment of the present application, see Figure 1 A through hole is provided in the radial direction of the heat-conducting metal ring 7, and a fastener 9 is provided in the through hole to connect with the extended boss 2 of the shell.

[0054] In this embodiment, by providing a through hole and installing a fastener 9 within the through hole to connect to the housing extension boss 2, not only does the connection strength between the heat-conducting metal ring 7 and the housing extension boss 2 increase, but it also allows heat to be more smoothly transferred through the heat-conducting metal ring 7 to the housing extension boss 2, where it can then be carried away by external airflow. Furthermore, the tightening effect of the fastener 9 effectively prevents the heat-conducting metal ring 7 from loosening or deforming during prolonged use, ensuring the stability and durability of the heat dissipation device.

[0055] It is understandable that the fastener 9 can be a screw, a pin, etc. In this embodiment, the fastener 9 is a screw, and the shell extension boss 2 is provided with a threaded hole for cooperating with the screw and the through hole.

[0056] In one embodiment of the present application, see Figure 2 The symmetry axis of the axial cross section of the annular cooler 4 coincides with the symmetry axis of the axial cross section of the color wheel 6 ; the axial length of the annular cooler 4 is greater than the axial length of the color wheel 6 .

[0057] In this embodiment, the axes of the heat-conducting metal ring 7, the color wheel 6 and the annular cooler 4 coincide with each other; the axial length of the heat-conducting metal ring 7 is much longer than that of the color wheel 6, and the radial distance between the heat-conducting metal ring 7 and the color wheel 6 ( Figure 1 The gap (in the gap) is within 0.25 mm, and the axial dimension of the housing extension boss 2 can be the same as that of the heat-conducting metal ring 7. Furthermore, the axes of symmetry of the axial cross-sections of the heat-conducting metal ring 7, the color wheel 6, and the annular cooler 4 completely coincide. The unique geometric relationship among the heat-conducting metal ring 7, the color wheel 6, and the annular cooler 4 ensures that the turbulent flow generated by the rotation of the color wheel 6 maintains a high flow rate near the heat-conducting metal ring 7 and is relatively evenly distributed. This allows the turbulent flow to fully and evenly exchange heat with the heat-conducting metal ring 7, thereby improving the heat dissipation effect of the color wheel 6.

[0058] Figure 2 In the figure, X2 can simultaneously represent the symmetry axis of the axial section of the inner surface of the shell extension boss 2, the symmetry axis of the axial section of the first elastic heat-conducting ring 3, the symmetry axis of the axial section of the annular cooler 4, the symmetry axis of the axial section of the second elastic heat-conducting ring 5, the symmetry axis of the axial section of the outer peripheral surface of the color wheel 6, and the symmetry axis of the axial section of the heat-conducting metal ring 7. The six lines are combined into one.

[0059] In one embodiment of the present application, the annular cooler 4 is an annular TEC, the inner surface of the annular cooler 4 is a cold surface, and the outer surface of the annular cooler 4 is a hot surface; the input parameters of the annular TEC can be changed to adjust the cooling effect of the annular TEC.

[0060] In the embodiment, the input parameters of the annular TEC can be dynamically adjusted according to the actual working temperature of the color wheel 6, so that the cooling efficiency of the color wheel cooling device can be further improved. When the temperature of the color wheel 6 is relatively high, the refrigeration power of the annular TEC can be increased to rapidly reduce the temperature of the color wheel 6; and when the temperature of the color wheel 6 is relatively stable or relatively low, the refrigeration power can be appropriately reduced to save energy and prolong the service life of the annular TEC.

[0061] In the embodiment, the refrigeration effect of the annular TEC can be adjusted by changing the input parameters of the annular TEC. Therefore, the color wheel cooling device provided in the embodiment can flexibly adapt to the cooling requirements of different products.

[0062] In the embodiment, TEC refers to a thermoelectric cooler, which is a semiconductor refrigeration device based on the principle of thermoelectric effect. The TEC is made of N-type and P-type semiconductor materials through a special process. When a direct current passes through the electric couple formed by the series connection of the two types of semiconductor materials, heat can be absorbed and released at the two ends of the electric couple, respectively, so as to achieve the purpose of refrigeration. In the color wheel cooling device, the annular TEC serves as a core cooling component, the inner surface of which is in close contact with the heat-conducting metal ring 7 as a cold surface to absorb heat through the thermoelectric effect, and the outer surface as a hot surface to dissipate heat to the air through the first elastic heat-conducting ring 3, the housing extension boss 2 and the light machine housing 1. In this way, the annular TEC can effectively reduce the temperature of the color wheel 6 and improve the stability and service life of the device.

[0063] In the embodiment, the heat-conducting metal ring 7 is made of copper, which has high heat conductivity and strong uniform temperature performance, so that it can quickly transfer the heat generated by the color wheel 6 to the annular TEC, thereby accelerating the dissipation of heat. In addition, the strength and corrosion resistance of copper also ensure that the heat-conducting metal ring 7 can maintain stable performance during long-term use and is not prone to deformation or damage.

[0064] In the embodiment, please refer to Figure 2 , the color wheel 6 is installed on the light machine housing 1 through the rotating shaft 8, Figure 2 , and the arrow direction shown in

[0065] The application also provides a projection light source (not shown), which comprises the color wheel 6 and the color wheel cooling device described above; and the color wheel cooling device is arranged around the color wheel 6.

[0066] In the embodiment, the projection light source comprises the color wheel cooling device described above, so that the temperature of the color wheel 6 can also be efficiently reduced, and the problem of excessively high temperature of the color wheel 6 can be effectively solved.

[0067] The above only describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A color wheel heat dissipation device for dissipating heat of a color wheel, wherein the color wheel comprises a light-incoming surface, a light-emitting surface, and an outer peripheral surface, wherein the light-incoming surface and the light-emitting surface are disposed opposite to each other, and the outer peripheral surface connects the light-incoming surface and the light-emitting surface to jointly define the color wheel, characterized in that: The color wheel heat dissipation device comprises: an optical engine housing, wherein the color wheel is rotatably connected to the optical engine housing; A housing extension boss, wherein the housing extension boss is provided on the inner wall of the optical engine housing; a heat-conducting metal ring, the heat-conducting metal ring being arranged around the outer peripheral surface, the color wheel being located inside the heat-conducting metal ring; and An annular cooler is arranged around the outer peripheral surface and is located between the heat-conducting metal ring and the shell extension boss.

2. The color wheel heat dissipation device according to claim 1, wherein: The color wheel heat dissipation device also includes: A first elastic heat-conducting ring, the first elastic heat-conducting ring is located between the housing extension boss and the annular cooler; and / or A second elastic heat-conducting ring is located between the annular cooler and the heat-conducting metal ring.

3. The color wheel heat dissipation device according to claim 1, wherein: The housing extension boss is integrally formed and arranged on the inner surface of the optical engine housing.

4. The color wheel heat dissipation device according to claim 1, wherein: The inner surface of the shell extension boss is annular and is arranged around the outer peripheral surface; the symmetry axis of the axial section of the shell extension boss coincides with the symmetry axis of the axial section of the outer peripheral surface; the axial length of the shell extension boss is greater than the axial length of the color wheel.

5. The color wheel heat dissipation device according to claim 1, wherein: The symmetry axis of the axial cross section of the heat-conducting metal ring coincides with the symmetry axis of the axial cross section of the outer peripheral surface; and the axial length of the heat-conducting metal ring is greater than the axial length of the color wheel.

6. The color wheel heat dissipation device according to claim 1, wherein: A groove is provided on the outer surface of the heat-conducting metal ring, and the annular cooler is located in the groove.

7. The color wheel heat dissipation device according to claim 1, wherein: The heat-conducting metal ring is provided with a through hole in its radial direction, and a fastener is provided in the through hole to connect with the extended boss of the shell.

8. The color wheel heat dissipation device according to claim 1, wherein: The symmetry axis of the axial cross section of the annular cooler coincides with the symmetry axis of the axial cross section of the outer peripheral surface; and the axial length of the annular cooler is greater than the axial length of the color wheel.

9. The color wheel heat dissipation device according to any one of claims 1 to 8, wherein: The annular cooler is an annular TEC, the inner surface of the annular cooler is a cold surface, and the outer surface of the annular cooler is a hot surface; the input parameters of the annular TEC can be changed to adjust the cooling effect of the annular TEC.

10. A projection light source, characterized in that: The projection light source includes a color wheel and a color wheel heat dissipation device according to any one of claims 1 to 9; the color wheel heat dissipation device is arranged around the color wheel.

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