CN116931353A

CN116931353A - Wavelength conversion device

Info

Publication number: CN116931353A
Application number: CN202210323367.1A
Authority: CN
Inventors: 张相雄; 张贤鹏; 肖晟
Original assignee: Hunan University
Current assignee: Hunan University
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2023-10-24

Abstract

The application discloses a wavelength conversion device, which comprises: a sealing body formed with a first sealed cavity; the fluorescent wheel assembly is positioned in the first sealed cavity, the fluorescent wheel assembly comprises a substrate, a rotating shaft and a driving piece, the substrate comprises a first surface and a second surface which are opposite, the rotating shaft is arranged on the second surface of the substrate, and the driving piece is connected with the rotating shaft; the inner circulation channel is arranged in the first sealing cavity, and the driving piece is positioned in the inner circulation channel; when the driving piece drives the substrate to rotate, the flowing medium in the first sealed cavity flows to the rotating shaft and returns to the internal circulation channel through the second surface of the substrate. The application reduces the influence of heat on the laser efficiency of the fluorescent powder.

Description

Wavelength conversion device

Technical Field

The application relates to the technical field of photoelectricity, in particular to a wavelength conversion device.

Background

In a high-brightness laser fluorescence projection system, laser irradiates on fluorescent powder on the surface of a light emitting area of a wavelength conversion device, a large amount of laser is lost and converted into heat in the process of exciting fluorescence, and the heat is transferred to air in the wavelength conversion device and is transferred to the external environment by the air in the wavelength conversion device. However, the existing wavelength conversion device has low heat transfer efficiency, thereby affecting the excitation efficiency of the fluorescent powder.

Disclosure of Invention

The application provides a wavelength conversion device, which aims to solve the problem that the existing wavelength conversion device is low in heat transfer efficiency, so that the excitation efficiency of fluorescent powder is affected.

In order to solve the above-mentioned technical problems, the present application provides a wavelength conversion device, which includes: a sealing body formed with a first sealed cavity; the fluorescent wheel assembly is positioned in the first sealed cavity, the fluorescent wheel assembly comprises a substrate, a rotating shaft and a driving piece, the substrate comprises a first surface and a second surface which are opposite, the rotating shaft is arranged on the second surface of the substrate, and the driving piece is connected with the rotating shaft; the inner circulation channel is arranged in the first sealing cavity, and the driving piece is positioned in the inner circulation channel; when the driving piece drives the substrate to rotate, the flowing medium in the first sealed cavity flows to the rotating shaft and returns to the internal circulation channel through the second surface of the substrate.

The wavelength conversion device comprises a hollow first heat dissipation cover, wherein one end of the first heat dissipation cover is provided with a fluorescent wheel assembly, a first channel interval is formed between the other end of the first heat dissipation cover and the first sealing cavity, a second channel interval is formed between the first heat dissipation cover and the sealing body, and the center of the first heat dissipation cover, the first channel interval and the second channel interval are communicated to form an inner circulation channel.

The wavelength conversion device comprises a plurality of inner heat dissipation driving parts, and the inner heat dissipation driving parts are arranged in the inner circulation channel.

The wavelength conversion device comprises a plurality of first radiating fins which are arranged in the second channel interval.

The first radiating fins are radially arranged between the first radiating cover and the inner side wall of the sealing body.

The wavelength conversion device comprises an outer heat dissipation part, wherein the outer heat dissipation part is arranged at the periphery of the sealing body and is in heat conduction contact with the sealing body.

The outer radiating part comprises a second radiating cover and a plurality of second radiating fins, the second radiating fins are connected between the outer side surfaces of the second radiating cover and the sealing body, and the adjacent second radiating fins, the sealing body and the second radiating cover are surrounded to form an outer circulation channel.

The outer heat dissipation part comprises an upper shell and a lower shell, the upper shell and the lower shell are respectively arranged on two opposite sides of the second heat dissipation cover, a second sealing cavity is formed by surrounding the upper shell, the second heat dissipation cover and the lower shell, the lower shell is provided with an inlet, the upper shell is provided with an outlet, and the inlet, the outer circulation channel and the outlet are sequentially provided with flowing media.

The plurality of second radiating fins are radially arranged between the second radiating cover and the outer peripheral surface of the sealing body; wherein the number of first fins is greater than the number of second fins.

The outer heat dissipation part comprises a flow channel, the flow channel is wound around the periphery of the sealing body in a winding mode, and flowing media flow in the flow channel.

The beneficial effects of the application are as follows: in contrast to the prior art, the present application provides a wavelength conversion device, where both the fluorescent wheel assembly and the internal circulation channel are located in a first sealed cavity of the sealing body. The fluorescent wheel assembly comprises a base plate, a rotating shaft and a driving piece. When the driving piece drives the substrate to rotate, the flowing medium in the first sealed cavity flows to the rotating shaft and returns to the internal circulation channel through the second surface of the substrate. Through the mode, the heat of the rotating shaft and the second surface of the substrate is sequentially reduced, the rapid heat exchange of the fluorescent wheel assembly is realized, and the influence of the heat on the laser efficiency of the fluorescent powder is reduced.

Drawings

For a clearer description of the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

FIG. 1 is a schematic perspective view of a first embodiment of a wavelength conversion device according to the present application;

FIG. 2 is a schematic cross-sectional view of a first embodiment of the wavelength conversion device of the present application;

FIG. 3 is a schematic cross-sectional view of a second embodiment of the wavelength conversion device of the present application;

FIG. 4 is a partial top view of a first embodiment of the wavelength conversion device of the present application;

FIG. 5 is a schematic perspective view of a third embodiment of a wavelength conversion device according to the present application;

FIG. 6 is a schematic cross-sectional view of a third embodiment of a wavelength conversion device according to the present application;

FIG. 7 is a schematic cross-sectional view of a fourth embodiment of a wavelength conversion device according to the present application;

FIG. 8 is a schematic perspective view of an embodiment of a fluorescent wheel assembly of the present application.

Reference numerals: 100. a wavelength conversion device; 1. a fluorescent wheel assembly; 11. a substrate; 11a, a first surface; 11b, a second surface; 12. a light emitting region; 13. a heat dissipation plate; 14. a ventilation assembly; 15. a rotating shaft; 2. a sealing body; 21. a first sealed cavity; 22. an inner circulation passage; 23. a first heat sink; 24. a first heat dissipation cover; 25. a first channel spacing; 26. a second channel interval; 3. an outer heat dissipation part; 31. a second heat dissipation cover; 32. a second heat sink; 33. an outer circulation passage; 34. an upper housing; 35. a lower housing; 36. a second sealed cavity; 37. an access port; 38. an access opening; 39. a flow channel.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present application, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

When the laser is incident on the fluorescent powder in the light-emitting area of the wavelength conversion device, the laser is excited to generate fluorescence, and the laser and the fluorescence together generate white light for projection. Since a large amount of heat is generated during the conversion of the laser light into fluorescence, the heat is transferred to the thermal diffusion region through the light emitting region. The wavelength conversion device comprises a color wheel and a rotating shaft connected with the color wheel. In order to reduce the temperature of the thermal diffusion region, a conventional method used by those skilled in the art is to reduce the temperature of the surface of the color wheel first, and then reduce the temperature of the rotating shaft connected with the color wheel, so as to improve the stability of the wavelength conversion device. However, in actual process, the heat-resistant temperature of the rotating shaft is lower than that of the color wheel surface.

A wavelength conversion device according to the present application will be described in detail with reference to examples.

Referring to fig. 1 and 2, fig. 1 is a schematic perspective view of a first embodiment of a wavelength conversion device according to the present application; fig. 2 is a schematic cross-sectional view of a first embodiment of the wavelength conversion device of the present application. In one embodiment, the wavelength conversion device 100 includes a sealing body 2, a fluorescent wheel assembly 1, and an internal circulation channel 22. The sealing body 2 is formed with a first sealed cavity 21. The fluorescent wheel assembly 1 and the inner circulation passage 22 are formed in the first sealed cavity 21. The internal circulation channel 22 provides a path for the flowing medium to flow, facilitating the circulating flow of the flowing medium. The fluorescent wheel assembly 1 comprises a base plate 11, a rotating shaft 15 and a driving member (not shown in the figure), wherein the base plate 11 comprises a first surface 11a and a second surface 11b which are opposite, and the rotating shaft 15 is arranged on the second surface 11b of the base plate 11. The second surface 11b of the base plate 11 and the rotation shaft 15 face the inner circulation passage 22. The driving member is located in the inner circulation passage 22, and the driving member is connected to the rotation shaft 15.

When the driving member is operated, the driving member drives the rotating shaft 15 to rotate the substrate 11. In the process of rotating the substrate 11, the flowing medium in the first sealing cavity 21 can be driven to blow to the rotating shaft 15 through the internal circulation channel 22, so that heat on the rotating shaft 15 is taken away; the flowing medium then flows to the second surface of the substrate 11, and takes away heat from the second surface of the substrate 11, and returns to the internal circulation channel 22. Through the above-mentioned multiple cycles, the temperature of the rotating shaft 15 is first reduced, and then the temperature of the fluorescent wheel assembly 1 is reduced.

Therefore, the fluorescent wheel assembly 1 and the internal circulation channel 22 are matched with each other, so that the temperature of the rotating shaft 15 and the substrate 11 is reduced, and the stability of the wavelength conversion device is further improved. The internal circulation passage 22 may be any passage, and the specific structure of the internal circulation passage 22 in the sealing body 2 may be any one as long as the internal circulation passage 22 is blown toward the rotating shaft 15 first, and then flows toward the second surface 11b of the substrate 11 and returns to the internal circulation passage 22. Wherein the flowing medium in the sealing body 2 can be normal temperature air, cooling air or the like.

With continued reference to fig. 2, in one embodiment, the wavelength conversion device 100 includes a first heat sink cap 24. The first heat dissipation cover 24 is disposed in a hollow shape. The first heat dissipation cover 24 includes two opposite ends, and one end of the first heat dissipation cover 24 is provided with the fluorescent wheel assembly 1. A first passage space 25 is formed between the other end of the first heat dissipation cover 24 and the first sealed cavity 21. A second channel space 26 is formed between the first heat dissipation cover 24 and the sealing body 2. The first heat dissipation cover 24 is internally communicated with the first channel space 25 and the second channel space 26 to form an internal circulation channel 22. The driving member is located in the first heat dissipation case 24.

For example, the first heat dissipation cover 24 having a hollow shape is internally provided with a channel a, the second channel space 26 is provided with a channel B, that is, the flowing medium flows from the channel a to the rotating shaft in the fluorescent wheel assembly 1 and exchanges heat with the rotating shaft as indicated by the dotted arrow in fig. 2, then flows to the second surface 11B of the substrate 11 and exchanges heat with the second surface 11B, the temperature of the flowing medium increases, and then enters the channel B, so that the circulation of the channel a-fluorescent wheel assembly 1-channel B-channel a is formed.

Therefore, the hollow first heat dissipation cover 24 is provided with the first channel interval 25, the second channel interval 25 and other structures, so that the circulating flow of the flowing medium in the sealing body 2 is realized, the heat exchange efficiency is improved, the heat of the fluorescent wheel assembly 1 is reduced, and the structure is simple and easy to implement.

The hollow first heat dissipation cover 24 may have any shape, and may satisfy the internal circulation passage 22, and its specific structure is not limited. For example, if the first heat dissipation cover 24 is a hollow cylindrical cover, the driving member drives the flowing medium to flow to the rotating shaft 15 and the second surface 11b of the substrate 11 through the center of the hollow cylindrical cover, so as to take away the heat on the substrate 11, thereby improving the heat dissipation efficiency.

If the first heat dissipation cover is a conical hollow cover. The diameter of the conical hollow cover far away from one end of the rotating shaft is larger than that of the conical hollow cover close to one end of the rotating shaft, and the flowing medium driven by the driving piece can be concentrated at the position of the conical hollow cover close to one end of the rotating shaft, so that more flowing medium is concentrated to be blown onto the rotating shaft 15 and the second surface 11b of the substrate 11, heat on the substrate 11 is taken away, and the heat dissipation efficiency is improved. Optionally, a diameter of an end of the first heat dissipation cover 24 near the driving member is smaller than a diameter of the base plate 11.

In one embodiment, the wavelength conversion device 100 increases the speed of the medium flowing through the internal circulation channel 22 in the sealing body 2 by the driving member, so as to further reduce the heat on the fluorescent wheel assembly 1. In practice, the wavelength conversion device may further include a plurality of internal heat dissipation drivers. In one embodiment, an inner heat dissipation driving member (not shown) is disposed in the inner circulation channel 22. The flow speed of the flowing medium in the internal circulation channel 22 is improved through a plurality of internal heat dissipation driving pieces, and the heat exchange efficiency is improved, so that the temperature of the fluorescent wheel assembly 1 is further reduced.

Specifically, the inner heat dissipation driver is disposed inside at least one of the first heat dissipation cover 24, the first channel space 25, and the second channel space 26. . For example, the inner heat dissipation driving member may be disposed in the first heat dissipation cover 24 and close to the driving member. Or the inner heat dissipation driving member is disposed between the adjacent first heat dissipation fins 23. Or an inner heat sink driver is disposed within the first channel spacing 25. Or the inner heat dissipation driving member is disposed in the first heat dissipation cover 24, the first channel space 25, and the second channel space 26 at the same time. Therefore, the specific installation position of the inner heat dissipation driving member is not limited. The number of the inner heat dissipation driving members may be one, two or more, and is not limited. Alternatively, the inner heat dissipation driving member may be a driving fan, by which the flowing medium in the inner circulation passage 22 is driven to circulate.

In an embodiment, the wavelength conversion device 100 includes a plurality of first heat sinks 23. The first heat sink 23 has a heat conduction function. The plurality of first cooling fins 23 are arranged between the first cooling cover 24 and the inner side wall of the sealing body 2 at intervals. A certain heat dissipation channel is formed between the adjacent first heat dissipation fins 23, and the second channel space 26 is formed. The flowing medium heated by the fluorescent wheel assembly 1 exchanges heat with the first heat sink 23 in the B channel during the B channel, and the heat is transferred to the side wall of the sealing body 2. The number of the first heat dissipation fins 23 may be one, two or more, and the heat of the first heat dissipation cover 24 and the heat of the flowing medium can be transferred to the inner side wall of the sealing body 2.

In a specific embodiment, the plurality of first cooling fins 23 are radially disposed between the first cooling cover 24 and the inner side wall of the sealing body 2, so that heat in the sealing body 2 can be transferred to the inner side wall of the sealing body 2 through the plurality of first cooling fins 23, and the heat can be conveniently transferred to the external environment through the external cooling part 3; meanwhile, the distance between the adjacent first radiating fins 23 gradually increases towards the inner side wall of the sealing body 2, so that heat is conveniently concentrated towards the inner side wall of the sealing body 2. In the practical process, a plurality of first cooling fins 23 are uniformly arranged between the first cooling cover 24 and the inner side wall of the sealing body 2, so that the uniformity of heat conduction can be improved.

In an embodiment, the wavelength conversion device further comprises an external heat sink 3. The outer heat sink member 3 is provided on the outer periphery of the sealing body 2. The outer heat sink member 3 is in heat conductive contact with the sealing body 2. I.e. the heat is transferred to the outer heat sink member 3 through the side wall of the sealing member 2 and is carried away by the outer heat sink member 3 into the environment. Therefore, the wavelength conversion device 100 constructs an inner heat exchange circulation structure and an outer heat exchange circulation structure through the inner circulation channel 22 and the outer heat dissipation part 3, so that rapid heat exchange is realized, the heat of the fluorescent wheel assembly 1 is further reduced, and the influence of the heat on the laser efficiency of fluorescent powder is reduced.

The external heat dissipation structure may be any structure as long as it can transfer heat on the side wall of the sealing body 2 to the external environment, and the specific structure thereof is not limited. With continued reference to fig. 2, in an embodiment, the outer heat dissipation portion 3 includes a second heat dissipation cover 31 and a plurality of second heat dissipation fins 32, the second heat dissipation cover 31 is hollow, and the plurality of second heat dissipation fins 32 are disposed between the second heat dissipation cover 31 and the outer surface of the sealing body 2. Meanwhile, the adjacent second heat sink 32, sealing body 2 and second heat dissipation cover 31 are surrounded to form an outer circulation channel 33.

The flow medium thus heated by the fluorescent wheel assembly 1 is heat-exchanged through the B-channel and the first heat sink 23 in the B-channel and transferred to the second heat sink 32 through the sealing body 2. The flowing medium takes heat away through the outer circulation channel 33 and into the external air environment. Here, the flow medium may be normal temperature, cooling air, or the like. The number of the second heat dissipation fins 32 can be one, two or more, and the second heat dissipation fins 32 have heat conduction function and can transfer heat on the side wall of the sealing body 2 to the external environment.

In a specific embodiment, a plurality of external heat dissipation driving members (not shown) may be disposed in the external circulation channel 33, and the plurality of external heat dissipation driving members can drive the flow velocity of the flowing medium in the external circulation channel 33. Specifically, the external heat dissipation driver may be provided to at least one of the second heat dissipation cover 31 and the second heat dissipation fin 32. For example, the external heat dissipation driving member is disposed on the second heat dissipation cover 31, or the external heat dissipation driving member is disposed on both the second heat dissipation cover 31 and the second heat dissipation fin 32. The number of the external heat dissipation driving members may be one, two or more, and the specific number thereof is not limited.

When the medium in the flow passage 39 is normal temperature or cooling air, the external heat dissipation driving member may be a driving fan, and the driving fan drives the normal temperature or cooling air in the external circulation channel 33 to flow, so as to take away heat in the external circulation channel 33. Alternatively, the driving fan may be an axial flow fan.

Referring to fig. 3, fig. 3 is a schematic cross-sectional view of a second embodiment of a wavelength conversion device according to the present application. In an embodiment, in order to further enhance the heat dissipation efficiency of the external heat dissipation structure, the external heat dissipation portion 3 further includes an upper housing 34 and a lower housing 35, wherein the upper housing 34 and the lower housing 35 are respectively disposed at two opposite ends of the second heat dissipation cover 31, and the upper housing 34, the second heat dissipation cover 31 and the lower housing 35 enclose to form a second sealed cavity 36. By providing the second sealed cavity 36, heat radiation to components other than the wavelength conversion device 100 can be reduced; while also concentrating the heat within the second sealed cavity 36 to facilitate subsequent unified heat transfer to the external environment.

Specifically, the lower casing 35 is provided with an inlet 37, the upper casing 34 is provided with an outlet 38, and the flowing medium enters from the inlet 37 and flows in the outer circulation channel 33 and then flows out through the outlet 38, so that heat on the plurality of second cooling fins 32 in the outer circulation channel 33 is intensively taken away, and the heat exchange efficiency of the outer cooling part 3 is improved. The inlet port 37 and the outlet port 38 may be provided interchangeably.

When the flowing medium is normal temperature air or cooling air, the external heat dissipation driving member may be a driving fan, and the driving fan accelerates the normal temperature or cooling air flowing in the external circulation channel 33, so as to improve the heat exchange efficiency. Alternatively, the driving fan may be an axial flow fan.

When the flowing medium is other solutions such as a mixed solution of water and glycol, the external heat dissipation driving member may be a water pump or a turbine, so that the mixed solution of water and glycol in the external circulation channel 33 is accelerated by the water pump or the turbine, so as to improve the heat exchange efficiency.

Referring to fig. 4, fig. 4 is a partial top view of a first embodiment of a wavelength conversion device according to the present application. Referring to fig. 2 and 3, in an embodiment, a plurality of second heat dissipation fins 32 are radially disposed between the second heat dissipation cover 31 and the outer peripheral surface of the sealing body 2, so that heat of the side wall of the sealing body 2 can be transferred into the outer circulation channel 33 through the plurality of second heat dissipation fins 32 and then transferred into the external environment; at the same time, the heat is facilitated to be concentrated toward the inner side wall of the second heat dissipation cover 31. In the practical process, the second cooling fins 32 are uniformly arranged between the second cooling cover 31 and the inner side wall of the sealing body 2, so that the uniformity of heat conduction can be improved.

Meanwhile, since the heat quantity in the sealing body 2 is higher than that of the outer heat dissipation part 3, the number of the first heat dissipation fins 23 is larger than that of the second heat dissipation fins 32 in the embodiment, that is, the density of the first heat dissipation fins 23 is larger than that of the second heat dissipation fins 32, so that the heat exchange efficiency is increased, and the heat quantity of the fluorescent wheel assembly 1 is reduced.

Referring to fig. 1 to 4, in an embodiment, the transverse cross sections of the sealing body 2, the first heat dissipation cover 24 and the second heat dissipation cover 31 are all circular, and are consistent with the shape of the fluorescent wheel 1 in the fluorescent wheel assembly 1, so that heat is uniformly transferred to the first heat dissipation cover 24 and the second heat dissipation cover 31, and heat dissipation uniformity is improved. In addition, the length of the second heat sink 32 along the axial direction of the sealing body 2 is longer than the length of the first heat sink 23 along the axial direction of the sealing body 2, so that the heat conduction area can be increased, and more heat can be transferred to the external environment.

The flow medium in the internal circulation flow channel 39 is air, and the air is driven by the driving member to drive the substrate to rotate and the internal heat dissipation driving member to drive the substrate. The flowing medium in the outer circulation flow passage 39 may be air or a cooling solution, the air is driven by an outer heat radiation driving member such as a driving fan, and the cooling solution is driven by an outer heat radiation driving member such as a water pump.

Referring to fig. 5 and 6, fig. 5 is a schematic perspective view of a third embodiment of a wavelength conversion device according to the present application; fig. 6 is a schematic cross-sectional view of a third embodiment of a wavelength conversion device according to the present application. In another embodiment, the outer heat sink member 3 may have other structures. In one embodiment, the outer heat sink member 3 includes a flow passage 39, and a flow medium flows into the flow passage 39 to cool the flow passage 39. Because the flow channel 39 is winded around the periphery of the sealing body 2 in a winding way, the cooled flow channel 39 is contacted with the periphery of the sealing body 2, and the periphery of the sealing body 2 can be taken away, so that the heat of the fluorescent wheel assembly 1 is reduced.

The runner 39 can be integrally formed with the sealing body 2, so that the complexity and cost of the runner 39 in the manufacturing process can be effectively reduced. In addition, the flow medium may be, but is not limited to, cooling air or a mixed solution of water and ethylene glycol, etc.

Referring to fig. 7, fig. 7 is a schematic cross-sectional view of a fourth embodiment of a wavelength conversion device according to the present application. In another embodiment, the outer heat dissipation part 3 includes a second heat dissipation cover 31, a plurality of second heat dissipation fins 32, and a flow channel 39, wherein the plurality of second heat dissipation fins 32 are connected between the second heat dissipation cover 31 and the outer side surface of the sealing body 2, and the adjacent second heat dissipation fins 32, the sealing body 2, and the second heat dissipation cover 31 enclose to form an outer circulation channel 33. At the same time, the flow passage 39 sequentially penetrates a plurality of second heat dissipation fins 32 and is wound around the periphery of the sealing body 2 in a winding manner. The flowing medium flows into the flow passage 39 to cool the flow passage 39. Because the flow channel 39 is winded around the periphery of the sealing body 2 in a winding way, the cooled flow channel 39 is contacted with the periphery of the sealing body 2, and the periphery of the sealing body 2 can be taken away, so that the heat of the fluorescent wheel assembly 1 is reduced.

In another embodiment, the outer heat dissipation part 3 includes an upper case 34 and a lower case 35 in addition to the second heat dissipation cover 31, the plurality of second heat dissipation fins 32, and the flow passage 39, the lower case 35 is provided with an inlet 37, the upper case 34 is provided with an inlet 38, and the inlet 37, the outer circulation channel 33, and the inlet 38 are sequentially provided with a flowing medium. The flow passage 39 may pass through the upper case 34 and the lower case 35 at both ends.

In practical use, referring to fig. 8, fig. 8 is a schematic perspective view of an embodiment of a fluorescent wheel assembly according to the present application. Because the front surface of the fluorescent wheel assembly 1 is close to the top of the sealing body 2 or the position of the upper shell 34, in order not to influence the laser to irradiate the fluorescent wheel 1, a circular hole or a square through hole is formed in the top of the sealing body 2 or the upper shell 34 so that the laser can irradiate the fluorescent ring 12 of the fluorescent wheel 1. Further, the above-mentioned circular hole or square through hole may be sized to match the diameter of the focusing lens to ensure that the laser is focused on the fluorescent ring 12 and to ensure the sealing performance of the sealing body 2. Further, in this embodiment, the fluorescent wheel assembly 1 includes a light emitting region 12, and the light emitting region 12 is disposed on the first surface 11a of the substrate for generating fluorescence by excitation. The fluorescent wheel assembly 1 further comprises a heat dissipation assembly (not shown in the drawings), wherein the heat dissipation assembly comprises a plurality of heat dissipation plates 13, and the plurality of heat dissipation plates are convexly arranged on the second surface 11b of the substrate, which is arranged on the back of the first surface 11a, and are used for dissipating heat of the whole fluorescent wheel assembly 1.

Compared with the prior art, in the wavelength conversion device of the embodiment, the fluorescent wheel assembly and the internal circulation channel are both positioned in the first sealing cavity of the sealing body. The fluorescent wheel assembly comprises a base plate, a rotating shaft and a driving piece. When the driving piece drives the substrate to rotate, the flowing medium in the first sealed cavity flows to the rotating shaft and returns to the internal circulation channel through the second surface of the substrate. Through the mode, the heat of the rotating shaft and the second surface of the substrate is sequentially reduced, the rapid heat exchange of the fluorescent wheel assembly is realized, and the influence of the heat on the laser efficiency of the fluorescent powder is reduced.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.

Claims

1. A wavelength conversion device, the wavelength conversion device comprising:

a sealing body formed with a first sealed cavity;

the fluorescent wheel assembly is positioned in the first sealed cavity and comprises a substrate, a rotating shaft and a driving piece, wherein the substrate comprises a first surface and a second surface which are opposite, the rotating shaft is arranged on the second surface of the substrate, and the driving piece is connected with the rotating shaft;

the inner circulation channel is arranged in the first sealing cavity, and the driving piece is positioned in the inner circulation channel;

when the driving piece drives the substrate to rotate, the flowing medium in the first sealed cavity flows to the rotating shaft and returns to the internal circulation channel through the second surface of the substrate.

2. The wavelength conversion device according to claim 1, wherein the wavelength conversion device comprises a hollow first heat dissipation cover, wherein one end of the first heat dissipation cover is provided with the fluorescent wheel assembly, a first channel interval is formed between the other end of the first heat dissipation cover and the first sealed cavity, a second channel interval is formed between the first heat dissipation cover and the sealed body, and the center of the first heat dissipation cover, the first channel interval and the second channel interval are communicated to form the internal circulation channel.

3. The wavelength conversion device according to claim 2, wherein the wavelength conversion device comprises a number of inner heat dissipation drivers disposed within the inner circulation channel.

4. The wavelength conversion device according to claim 2, wherein the wavelength conversion device comprises a number of first heat sinks disposed within the second channel spacing.

5. The wavelength conversion device according to claim 4, wherein the plurality of first heat sinks are radially disposed between the first heat sink and the inner side wall of the sealing body.

6. The wavelength conversion device of claim 4, comprising an outer heat sink portion disposed about the periphery of the sealing body and in thermally conductive contact with the sealing body.

7. The wavelength conversion device according to claim 6, wherein the outer heat sink portion includes a second heat sink cap and a plurality of second heat sinks, the plurality of second heat sinks being connected between the second heat sink cap and the outer surface of the sealing body, and an outer circulation channel being defined adjacent to the second heat sink cap, the sealing body, and the second heat sink cap.

8. The wavelength conversion device according to claim 7, wherein the outer heat sink comprises an upper housing and a lower housing, the upper housing and the lower housing are disposed on opposite sides of the second heat sink respectively, the upper housing, the second heat sink and the lower housing are surrounded to form a second sealed cavity, the lower housing is provided with an inlet, the upper housing is provided with an outlet, and the inlet, the outer circulation channel and the outlet are sequentially provided with flowing media.

9. The wavelength conversion device according to claim 7, wherein the plurality of second heat radiating fins are radially disposed between the second heat radiating cover and the sealing body outer peripheral surface; wherein the number of first heat sinks is greater than the number of second heat sinks.

10. The wavelength conversion device according to claim 6, wherein said external heat sink portion includes a flow channel wound around said sealing body in a meandering manner, and a flow medium flows in said flow channel.