Color wheel heat dissipation device, and projection light source

Abstract

The present application provides a color wheel heat dissipation device, and a projection light source. A color wheel has a peripheral surface as well as a light incident surface and a light exit surface which are arranged opposite to each other, wherein the peripheral surface is connected to the light incident surface and the light exit surface so as to jointly define the color wheel. The color wheel heat dissipation device comprises an optical engine housing, a housing extension boss, a thermally-conductive metal ring, and an annular cooler. The color wheel is rotatably connected to the optical engine housing and located in the thermally-conductive metal ring; the housing extension boss is arranged on the inner wall of the optical engine housing; the thermally-conductive metal ring and the annular cooler are arranged around the peripheral surface; the annular cooler is located between the thermally-conductive metal ring and the housing extension boss. The projection light source comprises the color wheel and the color wheel heat dissipation device arranged around the color wheel. In the present application, the thermally-conductive metal ring is located between the annular cooler and the color wheel and is thus in a relatively low-temperature state, and high-temperature turbulence energy generated by rotation of the color wheel still has a great flow rate near the thermally-conductive metal ring and has a relatively uniform distribution, so that the turbulence energy fully exchanges heat with the thermally-conductive metal ring, thereby improving the heat dissipation effect of the color wheel.

Description

A color wheel heat dissipation device and a projection light source Technical Field

[0001] This 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 Technology

[0002] As a key component of laser projection display systems, the color wheel is small in size but has a high heat flux density, often resulting in high temperatures. However, the performance of the color wheel is significantly negatively correlated with temperature; furthermore, with the development of laser projection display technology, the thermal environment in which the color wheel operates is becoming increasingly harsh. Therefore, there is an urgent need to propose an efficient and feasible heat dissipation solution for the color wheel.

[0003] To address the problem of excessively high 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 heat dissipation characteristics of the system; 2. Adding turbulence plates to the substrate that rotates coaxially with and is closely connected to the color wheel to increase the contact area between the color wheel and the air, while generating turbulence that can improve the heat dissipation performance of the system.

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

[0005] Utility Model Content

[0006] The purpose of this 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 when dealing with high heat power color wheels in the prior art.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: a color wheel heat dissipation device is provided for heat dissipation of the color wheel. The color wheel has a light-incoming surface, a light-outcoming surface, and an outer peripheral surface. The light-incoming surface and the light-outcoming surface are arranged opposite to each other. The outer peripheral surface connects the light-incoming surface and the light-outcoming surface to jointly define the color wheel. The color wheel heat dissipation device includes an optical engine housing, a housing extension boss, a heat-conducting metal ring, and an annular cooler. The color wheel is rotatably connected inside the optical engine housing. The housing extension boss is disposed on the inner wall of the optical engine housing. The heat-conducting metal ring surrounds the color wheel, and the color wheel is located inside the heat-conducting metal ring. The annular cooler surrounds the color wheel, and the annular cooler is located between the heat-conducting metal ring and the housing extension boss.

[0008] 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 housing 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.

[0009] Optionally, the housing extension boss is integrally formed on the inner surface of the optical engine housing.

[0010] Optionally, the inner surface of the housing extension boss is annular, and the inner surface of the housing extension boss surrounds the outer peripheral surface; the axis of symmetry of the axial section of the housing extension boss coincides with the axis of symmetry of the axial section of the color wheel; the axial length of the housing extension boss is greater than the axial length of the color wheel.

[0011] Optionally, the axis of symmetry of the cross-section of the heat-conducting metal ring coincides with the axis of symmetry of the cross-section of the color wheel; the axial length of the heat-conducting metal ring is greater than the axial length of the color wheel.

[0012] Optionally, the outer surface of the heat-conducting metal ring is provided with a groove, and the annular cooler is located in the groove.

[0013] Optionally, the heat-conducting metal ring has a through hole in its radial direction, and a fastener is provided in the through hole to connect with the extended boss of the housing.

[0014] Optionally, the axis of symmetry of the annular cooler's cross-section coincides with the axis of symmetry of the color wheel's cross-section; the axial length of the annular cooler is greater than the axial length of the color wheel.

[0015] Optionally, the annular cooler is an annular TEC, with the inner surface of the annular cooler being the cold surface and the outer surface of the annular cooler being the hot surface; the input parameters of the annular TEC can be changed to adjust the cooling effect of the annular TEC.

[0016] This application also provides a projection light source, which includes a color wheel and the aforementioned color wheel heat dissipation device; the color wheel heat dissipation device is arranged around the color wheel.

[0017] The beneficial effects of the color wheel heat dissipation device and projection light source provided in this application are as follows: Compared with the prior art, in this application, the heat-conducting metal ring is located between the annular cooler and the color wheel. The heat-conducting metal ring will be in a relatively low temperature state. On the one hand, the high-temperature turbulence generated by the rotation of the color wheel still has a large flow velocity near the heat-conducting metal ring and is relatively uniformly distributed, so that the turbulence can fully exchange heat with the heat-conducting metal ring, improving the heat dissipation effect of the color wheel. On the other hand, the radiation energy of the color wheel will be efficiently absorbed by the heat-conducting metal ring. This heat will be conducted to the surface of the optical engine housing through the extended boss of the housing and finally carried away by the external airflow. Therefore, this application can effectively reduce the temperature of the color wheel, thereby effectively solving the problem of excessively high color wheel temperature. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, 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 these drawings without creative effort.

[0019] Figure 1 is a right-side cross-sectional view of a color wheel heat dissipation device provided in an embodiment of this application;

[0020] Figure 2 is a front view cross-sectional structural diagram of a color wheel heat dissipation device provided in an embodiment of this application.

[0021] In the figure, the following labels are used: 1-Optical machine housing; 2-Housing extension boss; 3-First elastic heat-conducting ring; 4-Annular cooler; 5-Second elastic heat-conducting ring; 6-Color wheel; 7-Heat-conducting metal ring; 8-Rotating shaft; 9-Fastener. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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, they should not be construed as limitations on this application.

[0025] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] Please refer to Figures 1 and 2 together. The color wheel heat dissipation device provided in the embodiment of this application will now be described. This color wheel heat dissipation device is used for heat dissipation of 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. 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 inside the optical engine housing 1. The housing extension boss 2 is disposed on the inner wall of the optical engine housing 1. The heat-conducting metal ring 7 is disposed around the color wheel 6, and the color wheel 6 is located inside the heat-conducting metal ring 7. The annular cooler 4 is disposed 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.

[0027] Compared with the prior art, the color wheel heat dissipation device provided in this application embodiment has the following advantages: In this embodiment, the heat-conducting metal ring 7 is located between the annular cooler 4 and the color wheel 6, and the heat-conducting metal ring 7 is in a relatively low temperature state. On the one hand, the high-temperature turbulence generated by the rotation of the color wheel 6 still has a large flow velocity near the heat-conducting metal ring 7 and is relatively uniformly distributed, allowing the turbulence to fully exchange heat with the heat-conducting metal ring 7, thus improving the heat dissipation effect of the color wheel 6. On the other hand, the radiant energy of the color wheel 6 will be efficiently absorbed by the heat-conducting metal ring 7, and this heat will be conducted to the surface of the optical engine housing 1 through the housing extension boss 2, and finally carried away by the external airflow. Therefore, this application can efficiently reduce the temperature of the color wheel 6, thereby effectively solving the problem of excessively high temperature of the color wheel 6.

[0028] In one embodiment of this application, please refer to Figures 1 and 2 together. 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.

[0029] In this embodiment, by setting the first elastic heat-conducting ring 3, the assembly gap between the housing extension boss 2 and the annular cooler 4 can be filled, effectively addressing a large range of component processing tolerances, and significantly reducing the thermal resistance of the color wheel heat dissipation device, improving the efficiency of heat conduction, and thus improving the heat dissipation effect of the color wheel 6.

[0030] Understandably, because the first elastic heat-conducting ring 3 has a certain degree of elasticity, it can fit tightly between the housing extension boss 2 and the annular cooler 4, forming a tighter contact surface. This tight contact facilitates heat conduction, enabling the annular cooler 4 to absorb and dissipate heat from the color wheel 6 more efficiently.

[0031] In addition, the first elastic heat-conducting ring 3 also has a certain damping 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.

[0032] In one embodiment of this application, please refer to Figures 1 and 2 together. 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.

[0033] In this embodiment, by adding a second elastic heat-conducting ring 5, the assembly gap between the annular cooler 4 and the heat-conducting metal ring 7 can be further filled, improving the efficiency of heat conduction 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 when the color wheel 6 rotates, protect the components from damage, and improve the stability of the overall color wheel heat dissipation device.

[0034] Specifically, the addition of the second elastic heat-conducting ring 5 makes the contact between the annular cooler 4 and the heat-conducting metal ring 7 more compact, thereby promoting rapid heat transfer. This close contact not only enhances heat conduction efficiency but also ensures that heat is evenly distributed, preventing localized overheating. Simultaneously, the shock-absorbing function of the second elastic heat-conducting ring 5 provides strong support for the stable operation of the heat dissipation device under high-speed conditions.

[0035] In this embodiment, both the first elastic heat-conducting ring 3 and the second elastic heat-conducting ring 5 are made of highly elastic, highly viscous, and highly thermally conductive materials, such as silicone or thermally conductive rubber, to ensure efficient heat conduction while maintaining good elasticity. This material selection allows the elastic heat-conducting rings to effectively transfer heat while filling assembly gaps, thereby improving overall heat dissipation performance.

[0036] In one embodiment of this application, the housing extension boss 2 is integrally formed on the inner surface of the optical engine housing 1.

[0037] In this embodiment, the housing extension boss 2 and the optical engine housing 1 are integrally molded, which not only simplifies the assembly process but also enhances the connection strength between the housing extension boss 2 and the optical engine housing 1, making the overall structure more stable. Furthermore, the integral molding design reduces the thermal resistance that might arise from too many connecting parts, allowing full utilization of the larger 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 improves the overall quality and reliability of the product while ensuring heat dissipation performance.

[0038] In one embodiment of this application, please refer to Figures 1 and 2 together. The inner surface of the housing extension boss 2 is annular, and the inner surface of the housing extension boss 2 is arranged around the outer peripheral surface of the color wheel 6. The axis of symmetry of the axial section of the housing extension boss 2 coincides with the axis of symmetry of the axial section of the color wheel 6. The axial length of the housing extension boss 2 is greater than the axial length of the color wheel 6.

[0039] This design ensures that the housing extension boss 2 completely covers the color wheel 6, thereby more effectively guiding heat from the color wheel 6 to the surface of the optical engine housing 1. Simultaneously, the inner surface of the housing extension boss 2 surrounds the outer circumference of the color wheel 6 and has an axial length greater than the color wheel 6, which helps to form a more uniform heat conduction path in the axial direction, reducing heat loss during transfer and further improving heat dissipation efficiency. Furthermore, this design also helps to improve the stability of the heat dissipation device, preventing the centrifugal force generated by the rotation of the color wheel 6 from adversely affecting the heat dissipation effect.

[0040] 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. The heat-conducting metal ring 7 and the annular cooler 4 only need to be wrapped around the outer peripheral surface of the color wheel 6. In this embodiment, it is preferred that the axes coincide. In Figure 2, X1 can simultaneously represent the axis of the inner surface of the housing 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, with six lines combined into one.

[0041] In one embodiment of this application, please refer to FIG2, the axis of symmetry of the axial section of the heat-conducting metal ring 7 coincides with the axis of symmetry of the axial 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.

[0042] In this embodiment, the axis of symmetry of the cross-section of the heat-conducting metal ring 7 coincides with the axis of symmetry of the 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 angle coefficient of the surface of the color wheel 6 with respect to the heat-conducting metal ring 7, significantly reduce the radiative heat transfer thermal resistance between the heat-conducting metal ring 7 and the color wheel 6, thereby further reducing the temperature of the color wheel 6.

[0043] In one embodiment of this application, the outer surface of the heat-conducting metal ring 7 is provided with a groove, and the annular cooler 4 is installed in the groove.

[0044] 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 prone to loosening or displacement, thus further ensuring the efficiency and stability of heat conduction. Simultaneously, the groove design can also increase the heat dissipation area of ​​the annular cooler 4 to a certain extent, improving its heat dissipation effect.

[0045] In one embodiment of this application, please refer to FIG1. ​​The heat-conducting metal ring 7 has a through hole in the radial direction, and a fastener 9 is provided in the through hole to connect with the housing extension boss 2.

[0046] In this embodiment, by providing a through hole and installing a fastener 9 inside the through hole to connect with the housing extension boss 2, not only is the connection strength between the heat-conducting metal ring 7 and the housing extension boss 2 enhanced, but heat can also be more smoothly conducted through the heat-conducting metal ring 7 to the housing extension boss 2, and then carried away by the external airflow. In addition, the fastening effect of the fastener 9 can effectively prevent the heat-conducting metal ring 7 from loosening or deforming during long-term use, ensuring the stability and durability of the heat dissipation device.

[0047] It is understood that the fastener 9 can be a screw, a pin, etc. In this embodiment, the fastener 9 is a screw, and the housing extension boss 2 is provided with a threaded hole, which is used to cooperate with the screw and the through hole.

[0048] In one embodiment of this application, referring to FIG2, the axis of symmetry of the axial section of the annular cooler 4 coincides with the axis of symmetry of the axial 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.

[0049] In this embodiment, the axes of the heat-conducting metal ring 7, the color wheel 6, and the annular cooler 4 coincide. 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 (Gap in Figure 1) is within 0.25 mm. The axial dimension of the housing extension boss 2 can be the same as that of the heat-conducting metal ring 7. At the same time, the axes of symmetry of the cross-sections of the heat-conducting metal ring 7, the color wheel 6, and the annular cooler 4 completely coincide. The special geometric relationship between the heat-conducting metal ring 7, the color wheel 6, and the annular cooler 4 ensures that the turbulence generated by the rotation of the color wheel 6 still has a large flow velocity near the heat-conducting metal ring 7 and is relatively uniformly distributed, so that the turbulence can fully and uniformly exchange heat with the heat-conducting metal ring 7, thereby improving the heat dissipation effect of the color wheel 6.

[0050] In Figure 2, X2 can simultaneously represent the axis of symmetry of the axial section of the inner surface of the shell extension boss 2, the axis of symmetry of the axial section of the first elastic heat-conducting ring 3, the axis of symmetry of the axial section of the annular cooler 4, the axis of symmetry of the axial section of the second elastic heat-conducting ring 5, the axis of symmetry of the axial section of the outer peripheral surface of the color wheel 6, and the axis of symmetry of the axial section of the heat-conducting metal ring 7, with six lines combined into one.

[0051] In one embodiment of this application, the annular cooler 4 is an annular TEC, the inner surface of the annular cooler 4 is the cold surface, and the outer surface of the annular cooler 4 is the hot surface; the input parameters of the annular TEC can be changed to adjust the cooling effect of the annular TEC.

[0052] In this embodiment, the input parameters of the ring TEC can be dynamically adjusted according to the actual operating temperature of the color wheel 6, which can further improve the cooling efficiency of the color wheel heat dissipation device. When the temperature of the color wheel 6 is high, the cooling power of the ring TEC can be increased to quickly reduce the temperature of the color wheel 6; while when the temperature of the color wheel 6 is relatively stable or low, the cooling power can be appropriately reduced to save energy and extend the service life of the ring TEC.

[0053] In this embodiment, the cooling effect of the ring TEC can be adjusted by changing the input parameters of the ring TEC. Therefore, the color wheel heat dissipation device provided in this application embodiment can flexibly adapt to the heat dissipation needs of different products.

[0054] In this embodiment, TEC refers to a thermoelectric cooler, a semiconductor cooling device that operates based on the thermoelectric effect. TECs are made from N-type and P-type semiconductor materials using a special process. When direct current passes through a thermocouple formed by the two semiconductor materials connected in series, heat is absorbed and released at the two ends of the thermocouple, thus achieving cooling. In the color wheel heat dissipation device, the annular TEC serves as the core cooling component. Its inner surface acts as the cold surface, closely contacting the heat-conducting metal ring 7 to absorb heat through the thermoelectric effect, while its outer surface acts as the hot surface, dissipating heat into the air through the first elastic heat-conducting ring 3, the shell extension boss 2, and the optical engine housing 1. In this way, the annular TEC can effectively reduce the temperature of the color wheel 6, improving the stability and service life of the equipment.

[0055] In this embodiment, the heat-conducting metal ring 7 is made of copper. Copper's high thermal conductivity and strong temperature uniformity enable it to quickly transfer the heat generated by the color wheel 6 to the annular TEC, thereby accelerating heat dissipation. In addition, copper's strength and corrosion resistance ensure that the heat-conducting metal ring 7 can maintain stable performance during long-term use and is not easily deformed or damaged.

[0056] In this embodiment, please refer to Figure 2. The color wheel 6 is mounted on the optical engine housing 1 via a rotating shaft 8. The arrow in Figure 2 indicates the direction of light propagation.

[0057] This application also provides a projection light source (not shown), which includes a color wheel 6 and the aforementioned color wheel heat dissipation device; the color wheel heat dissipation device is arranged around the color wheel 6.

[0058] In this embodiment, since the projection light source includes the aforementioned color wheel heat dissipation device, it can also efficiently reduce the temperature of the color wheel 6, effectively solving the problem of excessively high temperature of the color wheel 6.

[0059] The above description is merely a preferred embodiment of this application and is 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 color wheel heat dissipation device for heat dissipation of a color wheel, the color wheel having a light-incoming surface, a light-outgoing surface, and an outer peripheral surface, the light-incoming surface and the light-outgoing surface being disposed opposite to each other, the outer peripheral surface connecting the light-incoming surface and the light-outgoing surface to jointly define the color wheel, characterized in that, The color wheel heat dissipation device includes: The optical engine housing, wherein the color wheel is rotatably connected within the optical engine housing; A housing extension boss is disposed on the inner wall of the optical engine housing; A heat-conducting metal ring is disposed around the outer peripheral surface, and the color wheel is located inside the heat-conducting metal ring; and An annular cooler is disposed around the outer peripheral surface and is located between the heat-conducting metal ring and the housing extension boss.

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

3. The color wheel heat dissipation device as described in claim 1, characterized in that, The housing extension boss is integrally formed on the inner surface of the optical engine housing.

4. The color wheel heat dissipation device as described in claim 1, characterized in that, The inner surface of the housing extension boss is annular, and the inner surface of the housing extension boss surrounds the outer peripheral surface; the axis of symmetry of the axial section of the housing extension boss coincides with the axis of symmetry of the axial section of the outer peripheral surface; the axial length of the housing extension boss is greater than the axial length of the color wheel.

5. The color wheel heat dissipation device as described in claim 1, characterized in that, The axis of symmetry of the cross-section of the heat-conducting metal ring coincides with the axis of symmetry of the cross-section of the outer peripheral surface; 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 as described in claim 1, characterized in that, The outer surface of the heat-conducting metal ring is provided with a groove, and the annular cooler is located in the groove.

7. The color wheel heat dissipation device as described in claim 1, characterized in that, The heat-conducting metal ring has a radial through hole, and a fastener is provided in the through hole to connect with the extended boss of the housing.

8. The color wheel heat dissipation device as described in claim 1, characterized in that, The axis of symmetry of the axial section of the annular cooler coincides with the axis of symmetry of the axial section of the outer peripheral surface; the axial length of the annular cooler is greater than the axial length of the color wheel.

9. The color wheel heat dissipation device as described in any one of claims 1-8, characterized in that, The annular cooler is an annular TEC, with its inner surface being the cold surface and its outer surface being the hot surface; the input parameters of the annular TEC can be changed to adjust its cooling effect.

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

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