Projection ray machine

Abstract

The utility model belongs to the field of heat dissipation of projection equipment, and discloses a projection ray machine which comprises a ray machine shell, an outer channel component and a first fan. According to the utility model, the external channel member mainly taking the first heat dissipation device as the light machine is arranged outside the light machine, so that the external channel which is communicated with the internal heat dissipation channel to form a closed internal circulation can be directly constructed outside the projection light machine, and heat can be transmitted outwards through the heat dissipation structure of the first heat dissipation device for heat dissipation; according to the heat dissipation structure, the problems of high cost, insufficient space and small heat dissipation area caused by constructing a circulation channel in the internal light machine shell can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat dissipation of projection devices, and particularly relates to a projection optical engine. Background Technique

[0002] With the progress and development of the technology in the projection industry, users have higher and higher requirements for the quality of the projection screen. There are mainly two designs of projection optical engines for LCD projectors on the market, namely, a closed optical engine and an open optical engine. For the open optical engine, there is a problem that dust adheres to the surface of the LCD, resulting in bright and dark spots on the screen. Therefore, in order to provide a better experience for users, the entire optical path needs to be designed in a closed manner, and at the same time, heat dissipation of the LCD needs to be carried out to meet the reliability of the LCD.

[0003] In the prior art, in order to achieve closed heat dissipation of the LCD, most optical engines construct a relatively complex heat dissipation structure inside the optical engine housing for internal circulation heat dissipation. For example, a heat dissipation channel including the LCD is arranged inside the optical engine housing to allow the air flow to circulate through the LCD of the optical engine, and internal circulation is carried out in cooperation with the internal circulation channel and the fan arranged. Although this can take away the heat of the LCD and prevent dust from entering, due to the small internal space of the inner body of the optical engine, the heat of the air taken away and entering cannot be effectively transferred to the outside, resulting in poor heat dissipation effect. Content of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a projection optical engine to solve the problem of poor heat dissipation caused by the internal heat dissipation structure arranged inside the existing projection optical engine for internal circulation.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A projection optical engine includes an optical engine housing, an outer channel member and a first fan. An air vent is provided on the optical engine housing, and the optical engine housing forms a heat dissipation channel for the air flow to flow through the liquid crystal component through the air vent. An outer channel member communicated with the heat dissipation channel is arranged outside the optical engine housing to form a closed heat dissipation circulation loop. At least part of the channel of the outer channel member is composed of a first heat dissipation device, and the first fan is located in the closed heat dissipation circulation loop.

[0007] In a possible implementation manner, the first heat dissipation device includes an inner heat exchange part arranged inside the closed heat dissipation circulation loop and an outer heat exchange part arranged outside the closed heat dissipation circulation loop, and the inner heat exchange part and the outer heat exchange part are thermally connected.

[0008] In a possible implementation manner, the first heat dissipation device further includes a shell layer, the inner heat exchange part is arranged on the inner wall of the shell layer, and the outer heat exchange part is arranged on the outer wall of the shell layer.

[0009] In a possible implementation, the first fan is disposed within the outer channel member.

[0010] In a possible implementation, the internal heat exchange portion includes a plurality of first fins, and a flow channel for guiding the air flow is formed between adjacent first fins.

[0011] In a possible implementation, the flow channel formed by the first fins includes at least two different guiding and diverging directions.

[0012] In a possible implementation, the outer channel member is wrapped around the outer periphery of the optical engine housing to form an air flow channel for the air flow to flow along the outer wall of the optical engine housing.

[0013] In a possible implementation, the first heat dissipation device further includes a plurality of covering sides that wrap around multiple sides of the optical engine housing to form at least part of the air flow channel, and the internal heat exchange portion covers the inner wall of the housing layer of each covering side.

[0014] In a possible implementation, the air flow channel extends from a covering side connected to the heat dissipation channel along one guiding direction or two different guiding directions to the remaining covering sides.

[0015] In a possible implementation, the first fan is disposed within the optical engine housing.

[0016] In a possible implementation, the heat dissipation channel includes a first channel formed within the optical engine housing and a second channel for the air flow to flow through the liquid crystal module. The first channel is sequentially connected to the second channel and the channel within the outer channel member to form the closed heat dissipation circulation loop, and the first fan is disposed within the first channel.

[0017] In a possible implementation, the outer channel member further includes a second heat dissipation device, and the second heat dissipation device covers the periphery of the first fan.

[0018] In a possible implementation, the projection optical engine further includes a second fan located outside the outer channel member, and the second fan covers the first heat dissipation device and the second heat dissipation device.

[0019] In a possible implementation, a polarizing plate is further disposed within the heat dissipation channel, and the polarizing plate and the liquid crystal module are sequentially arranged at intervals along the optical axis direction of the optical engine within the heat dissipation channel.

[0020] In a possible implementation, the heat dissipation channel is mainly formed by separating the light condensing device and the light transmitting element of the optical engine within the optical engine housing. The ventilation portion includes two ventilation holes opened on both sides of the optical engine housing, and the outer channel member is communicated with the heat dissipation channel through the two ventilation holes.

[0021] Compared with the prior art, the present utility model has the following beneficial effects:

[0022] For the projection optical engine of the present utility model, by providing an outer channel member mainly composed of a first heat dissipation device outside the optical engine, it is possible to not only facilitate the construction of an external channel outside the projection optical engine that communicates with the internal heat dissipation channel to form a closed internal circulation, but also dissipate heat by transferring heat outward through the heat dissipation structure of the first heat dissipation device. Such a heat dissipation structure can avoid the problems of high cost, insufficient space, and small heat dissipation area caused by constructing a circulation channel inside the internal optical engine housing. Brief Description of the Drawings

[0023] Figure 1 Is a three-dimensional view of an existing projection optical engine;

[0024] Figure 2 Is a three-dimensional view of a projection optical engine according to an embodiment of the present application from a first perspective;

[0025] Figure 3 Is a three-dimensional view of a projection optical engine according to an embodiment of the present application from a second perspective, and this figure also shows the air inlet and outlet directions of the axial flow fan;

[0026] Figure 4 Is a three-dimensional cross-sectional view of a projection optical engine according to an embodiment of the present application when it is unidirectional diversion;

[0027] Figure 5 Is a three-dimensional view of the first heat dissipation device of a projection optical engine according to an embodiment of the present application when it is unidirectional diversion;

[0028] Figure 6 Is a cross-sectional view of a projection optical engine according to an embodiment of the present application when it is bidirectional diversion;

[0029] Figure 7 Is an exploded view of a projection optical engine according to an embodiment of the present application when it is bidirectional diversion;

[0030] Figure 8 Is a three-dimensional cross-sectional view of a projection optical engine according to an embodiment of the present application when it is bidirectional diversion;

[0031] Figure 9 Is a three-dimensional view of the first heat dissipation device of a projection optical engine according to an embodiment of the present application when it is bidirectional diversion;

[0032] Figure 10 Is a three-dimensional view of a projection optical engine according to an embodiment of the present application when the first fan is arranged inside the optical engine housing;

[0033] Figure 11 Is a cross-sectional view of a projection optical engine according to an embodiment of the present application when the first fan is arranged inside the optical engine housing.

[0034] In the figure: 1 - optical machine housing; 11 - heat dissipation channel; 111 - first channel; 112 - second channel; 12 - ventilation part; 121 - ventilation port; 13 - chamber between lens groups; 14 - fan chamber; 15 - housing one; 16 - housing two; 2 - outer channel member; 21 - first heat dissipation device; 211 - third fin; 212 - first fin; 213 - flow channel; 214 - shell layer; 215 - covering side; 22 - closing member; 221 - installation cavity part; 222 - diversion cavity part; 223 - second heat dissipation device; 224 - fourth fin; 3 - lens assembly; 4 - second fan; 5 - heat dissipation module; 6 - light source; 7 - imaging Fresnel mirror; 8 - light cone; 9 - first fan; 10 - polarizer; 100 - liquid crystal component; 110 - third heat dissipation device; 120 - axial flow fan. Detailed implementation manners

[0035] To enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below in conjunction with the specific implementation manners.

[0036] Please refer to Figure 1 and Figure 6 As shown, the figure shows a three-dimensional structure of an existing projection optical machine. The projection optical machine generally mainly includes an optical machine housing 1, a light source 6, and a light cone 8, a polarizer 10, a liquid crystal component 100, an imaging Fresnel mirror 7, and a lens assembly 3 that are arranged inside the housing in sequence along the light emission direction of the light source 6. Among them, the liquid crystal component 100 mainly includes an LCD, i.e., a liquid crystal light valve, which generates a relatively large amount of heat during operation, so heat dissipation is required and dust is prevented from entering and sticking to the surface of the LCD. Generally, the internal space of the projection optical machine is determined and relatively small, which is not conducive to constructing an internal circulation flow channel inside for the airflow to circulate through liquid crystal components such as the LCD. And constructing a closed internal circulation flow channel in the internal structure design, although it can solve the problems of dust sticking to the surface of the LCD and heat dissipation, it will face problems such as insufficient space and small distribution area of the heat dissipation structure, which are not conducive to heat dissipation, and its material cost and manufacturing cost will also increase accordingly.

[0037] To solve the above technical problems, please refer to Figures 2 - 9 , an embodiment of the present application provides a projection optical machine, including an optical machine housing 1, an outer channel member 2, and a first fan 9. The optical machine housing 1 is provided with a ventilation part 12. The optical machine housing 1 forms a heat dissipation channel 11 for the airflow to flow through the liquid crystal component 100 through the ventilation part 12. An outer channel member 2 communicating with the heat dissipation channel 11 is arranged outside the optical machine housing 1 to form a closed heat dissipation circulation loop. At least part of the channel of the outer channel member 2 is composed of a first heat dissipation device 21, and the first fan 9 is located in the closed heat dissipation circulation loop.

[0038] The ventilation part 12 is formed on the optical engine housing 1. It is used to open the internal space of the housing mainly provided with liquid crystal components such as LCDs 100 and form a heat dissipation channel 11 conducive to air convection heat dissipation. It is connected to the external external channel member 2 through the ventilation part 12, so that a closed heat dissipation circulation loop can be formed by connecting the internal channel of the external channel member 2 and the heat dissipation channel 11. Through the closed heat dissipation circulation loop, the problem of dust entering the interior and sticking to the surface of the LCD can be avoided with a closed channel structure, and an external channel connected to the heat dissipation channel 11 can be constructed outside the optical engine housing 1 for internal circulation. In this way, the external space can be better utilized for heat dissipation to avoid the problem that the internal space is small and it is not conducive to the setting of a larger heat dissipation structure. The air circulation of the closed heat dissipation circulation loop is driven by the first fan 9, so that the air circulates through the liquid crystal component 100 in the closed heat dissipation circulation loop to take away heat, and then dissipates heat through the first heat dissipation device 21 that forms at least part of the channel. The external channel member 2 can be entirely composed of the first heat dissipation device 21, or can be jointly formed with other auxiliary closed members 22, such as the installation housing for installing the first fan 9 as the closed member 22, which can be specifically configured according to actual requirements.

[0039] It can be understood that the first fan 9 is arranged in the closed heat dissipation circulation loop to drive the internal air circulation for heat dissipation. The first fan can be arranged in the external channel member 2 or in the optical engine housing 1, both of which can achieve the function of driving the internal air circulation without limitation. When it is arranged in the optical engine housing 1, the optical engine housing 1 can not only provide an installation space for the first fan 9, but also further utilize the space between the imaging Fresnel mirror 7 and the lens assembly 3 to cooperate with the external channel member 2 to form a closed heat dissipation circulation loop while providing the installation space. That is, it can be understood that the heat dissipation channel 11 includes but is not limited to the channel part for arranging the liquid crystal component 100 for the air to flow through. However, regardless of whether the first fan 9 is arranged outside the optical engine housing 1 or in the external channel member 2 outside the optical engine housing 1, or neither is mainly in the optical engine housing 1 and the external channel member 2 but plays a role in driving the air flow in the closed heat dissipation circulation loop, it is included in the protection scope of the first fan 9 being located in the closed heat dissipation circulation loop.

[0040] In the embodiment of the present application, the liquid crystal component 100 includes but is not limited to LCDs. There are also many specific setting methods of the LCD in the heat dissipation channel 11. For example, the front and rear surfaces of the LCD are in a bare state, so that the air can flow through both surfaces, or additional components such as dust-proof transparent panels are attached to the front and rear surfaces of the LCD, and the heat dissipation air flow can directly pass through the surface of the LCD or through the surface of the dust-proof transparent panel.

[0041] In an embodiment regarding the first heat dissipation device 21, the first heat dissipation device 21 may include an internal heat exchange portion disposed inside a closed heat dissipation circulation loop and an external heat dissipation portion disposed outside the closed heat dissipation circulation loop, and the internal heat exchange portion and the external heat dissipation portion are thermally connected.

[0042] In this way, when the air flow flows through the internal heat exchange portion along the closed heat dissipation circulation loop, the internal heat exchange portion can contact the heat-carrying air flow after flowing through the liquid crystal module 100, and heat exchange can be carried out through the contact. After the heat exchange, the internal heat exchange portion transfers the heat to the external heat dissipation portion, and the external heat dissipation portion exposed to the outside can contact the air flowing outside or the air driven by components such as a fan to form a flowing air flow to achieve heat dissipation.

[0043] On this basis, the first heat dissipation device 21 further includes a shell layer 214. The internal heat exchange portion is disposed on the inner wall of the shell layer 214, and the external heat dissipation portion is disposed on the outer wall of the shell layer 214. The shell layer 214 of the first heat dissipation device 21 and the outer wall of the optical engine housing 1 can construct a partial channel of the closed heat dissipation circulation loop, and the internal heat exchange portion and the external heat dissipation portion are respectively disposed on the inner wall and the outer wall of the shell layer. In this way, when the air flow flows through this partial channel, heat exchange can be carried out to dissipate heat.

[0044] In the specific implementation process, the internal heat exchange portion can adopt a heat exchange structure with a large surface area, such as a fin structure, or a heat dissipation structure in which a medium such as a coolant is distributed through a pipeline on the inner wall of the shell layer 214 for heat exchange. The external heat dissipation portion can also adopt a structure such as a fin structure or other structural forms that cooperate with the internal heat exchange portion, and there is no limitation.

[0045] Preferably, as shown in Figure 5 、 Figure 6 and Figure 9 , the internal heat exchange portion includes a plurality of first fins 212, and a flow channel 213 for guiding the air flow is formed between adjacent first fins 212.

[0046] In this way, the first heat dissipation device 21 with a fin heat dissipation structure can carry out heat exchange with the air flow flowing through the channel through a plurality of first fins 212. Such a heat dissipation method is simpler and more effective, and the flow channel 213 formed between adjacent first fins 212 can be used for guiding the flow, that is, guiding the air flow from the air outlet end of the heat dissipation channel 11 to the air inlet end of the first fan 9, so that when the air flow flows between the air outlet end of the heat dissipation channel 11 and the air inlet end of the first fan 9, it can not only contact the first fins 212 more fully for heat exchange, but also make the air flow have a faster flow rate for rapid circulation, and take away the heat generated by the liquid crystal module 100 faster, improving the heat dissipation effect.

[0047] In order to improve the heat dissipation effect, further, the flow channel 213 formed by the first fins 212 includes at least two different guiding and diverting directions.

[0048] The guiding directions of the flow channels 213 formed by the first fins 212 are two or more, which is beneficial to increasing the flow area of the air flow in the first heat dissipation device 21, enabling it to contact the internal heat exchange part more and conduct more sufficient heat exchange, ensuring the smoothness of the heat dissipation air flow, and improving the heat dissipation effect. It can be understood that the guiding and diverging directions formed by the flow channels 213 can be distributed in a divergent shape, that is, the flow channels 213 are divided into two or more flow channels 213 in different directions and extend and distribute along different guiding directions, such as a Y-shaped diverging structure.

[0049] Regarding the closed heat dissipation circulation loop, under the heat dissipation action of the cooperating external channel member, its construction form can include but is not limited to setting the first fan 9 inside the optical engine housing 1 to further utilize the redundant space inside the optical engine housing 1 for heat dissipation and setting the first fan 9 outside the optical engine housing 1 to utilize the space inside the external channel member 2 outside the optical engine housing 1 for heat dissipation.

[0050] When the first fan 9 is arranged inside the external channel member 2, please refer to Figure 6 As shown, a preferred embodiment can be: The external channel member 2 is wrapped around the outer periphery of the optical engine housing 1 to form an air flow channel for the air flow to flow along the outer wall of the optical engine housing 1.

[0051] The external channel member 2 is communicated with the heat dissipation channel 11, and its main body is mainly wrapped around the outer periphery of the optical engine housing 1. In this way, the space outside the optical engine housing 1 can be utilized to set the external channel member 2, and the outer wall of the optical engine housing 1 serves as part of the air flow channel. This can not only make the structure compact but also reduce the volume of the housing of the first heat dissipation device 21 of the external channel member 2 and the material cost.

[0052] On this basis, referring to Figure 5 and Figure 9 As shown, the first heat dissipation device 21 may further include a plurality of covering sides 215 wrapped around multiple sides of the optical engine housing 1 to form at least part of the air flow channel, and the internal heat exchange part covers the inner wall of the shell layer 214 of each covering side 215.

[0053] For the optical engine housing 1 with multiple sides, the first radiator is adapted and wrapped through a plurality of covering sides 215. Such a wrapping structure is more compact, and since each covering side 215 is covered by the internal heat exchange part, while an air flow channel distributed along the outer periphery of the optical engine housing 1 can be formed, the first fins 212 of the internal heat exchange part can also have a larger distribution area, enabling the flow channels 213 to have a larger flow area and a longer length, and the heat dissipation effect is also better.

[0054] For example, in the case of an optical engine housing based on a pyramid shape, the first heat dissipation device 21 for forming the covering side 215 of the air flow channel includes more than two and no more than four covering sides 215, and the number of the covering sides 215 is selected and configured according to the guiding air flow direction; the first heat dissipation device 21 covers the circumference of the optical engine housing 1 through a plurality of covering sides 215, which can not only make more full use of the external space of the optical engine housing 1 to make the layout structure more compact, but also form an air flow channel with a longer path for heat exchange over a larger area.

[0055] At the same time, the heat exchange effect can also be improved in the guiding direction of the air flow channel, that is, the air flow channel extends from a covering side 215 connected to the heat dissipation channel 11 along one guiding direction or two different guiding directions to the remaining covering sides 215.

[0056] Due to the optical cone 8 housing having multiple sides, one covering side 215 of the first heat dissipation device 21 is connected to the air outlet end of the heat dissipation channel 11, which can facilitate guiding the air flow within the first heat dissipation device 21 and flowing through the remaining covering sides 215 from this covering side 215 along one guiding direction or two different guiding directions.

[0057] Specifically, in combination with Figure 6 shown, taking the optical engine housing in the shape of a pyramid as an example, the covering side 215 connected to the heat dissipation channel 11 is the first side, the two sides adjacent to the first covering side 215 are the second side and the third side respectively, the second side and the third side are opposite to each other, and the remaining side opposite to the first side is the fourth side, and a first fan 9 is arranged on the fourth side; correspondingly, when the air flow channel is distributed along one guiding wind direction, as Figure 4 and Figure 5 shown, it can extend from the first side along one guiding direction to the second side, and the air flow discharged from the heat dissipation channel 11 can sequentially pass through the air flow channels on the first side and the second side and flow to the air inlet of the first fan 9 on the fourth side, forming a single-side diversion structure with air inlet on one side, and then circulated by the first fan 9, while the third side is a structural side and is not used to form the air flow channel or is not covered on this side. For example, the first heat dissipation device 21 is an L structure and only has the first side and the second side covering two adjacent sides of the optical engine housing 1; when the air flow channel is distributed along two guiding wind directions, as Figure 8 and Figure 9As shown, the second side and the third side can extend and distribute along two different guiding directions respectively from the first side. The airflow discharged from the heat dissipation channel 11 can be divided into two airflows after flowing through the first side, and the two airflows can respectively flow through the air flow channels on the second side and the third side and flow towards the air inlet of the first fan 9 on the fourth side, forming a double-sided diversion structure with air intake on both sides, and then circulated by the first fan 9. For example, the first heat dissipation device 21 wraps three sides and is open on one side, and has the first side, the second side, and the third side that wrap three adjacent sides of the optical machine housing 1. In this way, a diversion airflow can be formed around both sides of the optical machine housing 1. Compared with single-sided air intake, the heat dissipation effect of double-sided air intake is better than that of single-sided air intake.

[0058] On this basis, the first fins 212 covering the inner heat exchange part of each covering side 215 also extend along the corresponding guiding wind direction, and the formed flow channels 213 also extend along the corresponding guiding wind direction. At the same time, when the first fins 212 extend from the first side to the second side or the third side, a smooth transition arc structure is provided to facilitate reducing the resistance when the airflow flows.

[0059] Please refer to Figure 4 As shown, in the embodiment of the present application, the outer channel member 2 further includes a second heat dissipation device 223, and the second heat dissipation device 223 is sleeved on the periphery of the first fan 9.

[0060] The second heat dissipation device 223 serves as the closing member 22, and it can enclose with the first heat dissipation device 21 to form a closed heat dissipation circulation loop. It is preferably of the same heat dissipation structure as the first heat dissipation device 21, that is, the inner wall of the second heat dissipation device 223 is also provided with second fins the same as the first fins 212, and the outer wall of the second heat dissipation device 223 is also provided with fourth fins 224 the same as the third fins 211 on the outer wall of the first heat dissipation device 21. That is to say, the outer channel member 2 is mainly composed of the first heat dissipation device 21 and the second heat dissipation device 223. By sleeving the first heat dissipation device 21 and the second radiator on the optical machine housing 1 and the first fan 9 respectively, a closed chamber environment can be constructed to form a channel structure for internal air circulation. In this way, by externally arranging a radiator adapted to the optical machine housing 1, it can be constructed outside, with low cost and good heat dissipation effect, avoiding the problems of insufficient space and poor heat dissipation effect existing in internal design.

[0061] Specifically, in combination with Figure 4 and Figure 7 As shown, the second heat dissipation device 223 further includes an installation cavity part 221 and a diversion cavity part 222 communicated with the installation cavity part 221. The first fan 9 is arranged in the installation cavity part 221, and the diversion cavity part 222 communicates the air outlet of the first fan 9 with the heat dissipation channel 11.

[0062] In order to achieve rapid heat dissipation of the first heat dissipation device 21 and the second heat dissipation device 223, in combination with Figure 3And Figure 4 As shown, the projection optical machine may further include a second fan 4 located outside the outer channel member 2, and the second fan 4 covers the first heat dissipation device 21 and the second heat dissipation device 223.

[0063] The second fan 4 may be an axial flow fan. By means of the axial flow fan, the nearby air flow can be driven to flow through the first heat dissipation device 21 and the second heat dissipation device 223 and then discharged from the air outlet of the axial flow fan, so that convective heat dissipation can be formed. The first fan 9 may be a centrifugal fan.

[0064] In the specific implementation process, in combination with Figure 4 As shown, since both the first heat dissipation device 21 and the second heat dissipation device 223 are fin structures, the second fins and the fourth fins 224 outside them are arranged in alignment, which is more conducive to heat dissipation. Of course, the second heat dissipation device 223 may not be a heat dissipation device, but may be other housing structures to facilitate the component closed chamber and the installation of the first fan 9.

[0065] In addition, a heat dissipation module 5 with fins may be arranged at the air outlet of the axial flow fan. The heat dissipation module 5 is used to dissipate heat from the light source 6, and the heat transferred to the fins is taken away by the air outlet of the axial flow fan.

[0066] Preferably, in combination with Figure 6 and Figure 7 As shown, the heat dissipation channel 11 is mainly formed by separating the light condensing device (i.e., the light cone 8) of the optical machine and the light transmitting element in the optical machine housing 1. The ventilation part 12 includes two ventilation holes opened on both sides of the optical machine housing 1, and the outer channel member 2 is communicated with the heat dissipation channel 11 through the two ventilation holes. By opening two opposite ventilation holes on both sides of the optical machine housing 1, it is convenient to directly communicate with the outer channel member 2, and it is also beneficial for the air flow to take away heat through the space between the polarizing plate 10 and the liquid crystal module 100.

[0067] When the first fan 9 is arranged in the optical machine housing 1, please refer to Figure 10 and Figure 11 As shown, a preferred embodiment may be: the heat dissipation channel 11 includes a first channel 111 formed in the optical machine housing 1 and a second channel 112 for the air flow to flow through the liquid crystal module 100. The first channel 111 is sequentially communicated with the second channel 112 and the channel in the outer channel member 2 to form the closed heat dissipation circulation loop, and the first fan 9 is arranged in the first channel 111.

[0068] A liquid crystal component 100 is arranged in the second channel 112. Both ends of the second channel 112 are respectively communicated with the channel in the outer channel member 2 and the first channel 111 arranged in the optical engine housing 1 through ventilation parts, and the three are communicated to form a closed heat dissipation circulation loop. In such a structure, the first fan 9 can be conveniently arranged in the first channel 111 in the optical engine housing 1, and the outer channel member 2 can mainly dissipate heat through the first heat dissipation device 21.

[0069] On this basis, since the space between the imaging Fresnel mirror 7 and the lens assembly 3 is large and idle, in order to further utilize this space and improve the overall compactness, combined with Figure 11 As shown, the first channel may include a fan chamber 14 communicated with the second channel and an inter-lens chamber 13 between the imaging Fresnel mirror 7 and the lens assembly 3. The inter-lens chamber 13 is communicated with the fan chamber 14 so that the air inlet of the first fan 9 is communicated with the inter-lens chamber 13. The inter-lens chamber 13 is also communicated with the outer channel member 2 through a ventilation port 121 on the outer wall. In this way, a closed heat dissipation circulation loop can be formed, and by using the redundant space of the inter-lens chamber 13 as a part of the channel, the compactness of the overall structure and the utilization rate of the internal space can be improved, and at the same time, a good heat dissipation effect can also be achieved.

[0070] In the specific implementation process, as shown in the figure, the optical engine housing 1 can be composed of two parts of the housing, such as including a housing one and a housing two. The housing one 15 is half of the structure of the existing optical engine housing, and the housing two 16 not only has the other half of the structure of the existing optical engine housing but also constructs a fan chamber 14. The housing one 15 and the housing two 16 are integrally connected or connected by fasteners to form the optical engine housing 1. At the same time, the first heat dissipation device 21 is arranged on the outside as the outer channel member 2, so that the space of the optical engine housing 1 can be utilized to a greater extent while avoiding a narrow internal space as much as possible.

[0071] In addition, combined with Figure 10 As shown, when the first fan 9 is arranged in the optical engine housing 1, an axial flow fan 120 and a heat dissipation module 5 with a fin structure can also be arranged at the same time. The inlet or outlet of the axial flow fan 120 axially covers the first heat dissipation device. At the same time, a third heat dissipation device 110 can also be arranged, and this heat dissipation device 110 mainly dissipates heat from the lamp board serving as a light source, and the third heat dissipation device 110 is also covered by the axial flow fan at the same time.

[0072] In the above preferred embodiment, preferably, combined with Figure 11As shown, the heat dissipation channel 11 is mainly formed by separating the light condensing device (i.e., the light cone 8) of the optical engine and the light transmissive element within the optical engine housing 1. The ventilation part 12 includes two ventilation holes opened on both sides of the optical engine housing 1 and a ventilation port 121 provided on the outer wall of the inter-lens group chamber. One end of the outer channel member 2 communicates with the second channel 112 through one ventilation hole, and the other end communicates with the inter-lens group chamber through the ventilation port 121. By opening two opposite ventilation holes and the ventilation port 121 on both sides of the optical engine housing 1, it is convenient to connect the outer channel member 2 and also beneficial for the air flow to take away heat through the spaced space between the polarizer 10 and the liquid crystal module 100.

[0073] Please refer to Figure 6 and Figure 11 As shown, in the embodiment of the present application, a polarizer 10 is further provided in the heat dissipation channel 11, and the polarizer 10 and the liquid crystal module 100 are sequentially arranged at intervals along the optical axis direction of the optical engine within the heat dissipation channel 11.

[0074] The polarizer 10 and the liquid crystal module 100 arranged at intervals can enable the air flow passing through the heat dissipation channel 11 to flow through both side surfaces of the polarizer 10 and the liquid crystal module 100, achieving a better heat dissipation effect.

[0075] The above is only the preferred embodiment of the present utility model. It should be noted that the above preferred embodiment should not be construed as a limitation to the present utility model. The protection scope of the present utility model should be subject to the scope defined by the claims. For those of ordinary skill in the art in this technical field, without departing from the spirit and scope of the present utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as within the protection scope of the present utility model.

Claims

1. A projection optical machine, characterized in that, It includes an optical engine housing (1), an outer channel member (2), and a first fan (9). An air vent portion (12) is provided on the optical engine housing (1). The optical engine housing (1) forms a heat dissipation channel (11) for air flow to pass through the liquid crystal module (100) via the air vent portion (12). An outer channel member (2) is provided outside the optical engine housing (1) and is connected to the heat dissipation channel (11) to form a closed heat dissipation circulation loop. At least part of the channel of the outer channel member (2) is constituted by a first heat dissipation device (21). The first fan (9) is located in the closed heat dissipation circulation loop.

2. The projection optical machine according to claim 1, wherein The first heat dissipation device (21) includes an inner heat exchange portion provided inside the closed heat dissipation circulation loop and an outer heat exchange portion provided outside the closed heat dissipation circulation loop. The inner heat exchange portion and the outer heat exchange portion are thermally connected.

3. A projection optical machine as described in claim 2, characterized in that, The first heat dissipation device (21) further includes a shell layer (214). The inner heat exchange portion is provided on the inner wall of the shell layer (214), and the outer heat exchange portion is provided on the outer wall of the shell layer (214).

4. A projection optical machine as claimed in claim 3, wherein, The inner heat exchange portion includes a plurality of first fins (212), and a flow channel (213) for guiding air flow is formed between adjacent first fins (212).

5. A projection optical machine according to claim 4, characterized in that, The flow channel (213) formed by the first fins (212) includes at least two different guiding and diverging directions.

6. A projection optical machine according to any one of claims 2-5, characterized in that The first fan (9) is provided inside the outer channel member (2).

7. A projection optical machine as described in claim 6, characterized in that, The outer channel member (2) is wrapped around the outer periphery of the optical engine housing (1) to form an air flow channel for air flow to flow along the outer wall of the optical engine housing (1).

8. A projection optical machine as claimed in claim 7, wherein The first heat dissipation device (21) further includes a plurality of covering sides (215) that wrap around multiple sides of the optical engine housing (1) to constitute at least part of the air flow channel. The inner heat exchange portion covers the inner wall of the shell layer (214) of each covering side (215).

9. A projection optical machine as claimed in claim 8, wherein The air flow channel extends and distributes from a covering side (215) connected to the heat dissipation channel (11) along one guiding direction or two different guiding directions to the remaining covering sides (215).

10. A projection optical machine according to any one of claims 1-5, characterized in that, The first fan (9) is provided inside the optical engine housing (1).

11. A projection optical machine according to claim 10, characterized in that, The heat dissipation channel (11) includes a first channel (111) formed inside the optical engine housing (1) and a second channel (112) for air flow to pass through the liquid crystal module (100). The first channel (111) is sequentially connected to the second channel (112) and the channel inside the outer channel member (2) to form the closed heat dissipation circulation loop. The first fan (9) is provided in the first channel (111).

12. A projection optical machine according to claim 6, characterized in that, The outer channel member (2) further includes a second heat dissipation device (223), and the second heat dissipation device (223) covers the periphery of the first fan (9).

13. A projection optical machine as described in claim 12, characterized in that, The projection optical engine further includes a second fan (4) located outside the outer channel member (2), and the second fan (4) covers the first heat dissipation device (21) and the second heat dissipation device (223).

14. A projection optical machine as described in claim 1, characterized in that, A polarizer (10) is further provided in the heat dissipation channel (11), and the polarizer (10) and the liquid crystal module (100) are sequentially arranged at intervals along the optical axis direction of the optical engine in the heat dissipation channel (11).

15. A projection optical machine according to claim 1, characterized in that, The heat dissipation channel (11) is mainly formed by separating the condenser device and the light-transmitting element of the optical engine within the optical engine housing (1). The ventilation part (12) includes two ventilation holes opened on both sides of the optical engine housing (1), and the outer channel member (2) is communicated with the heat dissipation channel (11) through the two ventilation holes.

Images