A closed light machine with uniform heat dissipation and LCD projector

Abstract

The utility model relates to a closed light machine and LCD projector of even heat dissipation, closed light machine includes: imaging module, light machine casing, inner circulation fan, heat dissipation module and outer circulation fan unit, the imaging module sets up in the light machine casing and will the light machine casing inside part separate transition air duct, primary cooling air duct and secondary cooling air duct, the inner circulation fan sets up in the fan cavity, the air current of the air outlet output of inner circulation fan enters transition air duct, the heat dissipation module includes the cold end radiator and hot end radiator of the heat conduction of being connected, the hot end radiator sets up in the heat exchange cavity, the cold end radiator sets up in the light machine casing outside, the outer circulation fan unit includes first outer circulation fan, the closed light machine inside air duct of this application divides into transition air duct, primary cooling air duct and secondary cooling air duct, improves the uniformity of air distribution, and then promotes the uniformity of LCD screen temperature distribution.

Description

Technical Field

[0001] This utility model relates to the field of projector technology, and in particular to a sealed optical engine with uniform heat dissipation and an LCD projector. Background Technology

[0002] Common LCD (Liquid Crystal Display) projector optical engines are divided into open and closed types. In open optical engines, the internal optical components (such as the LCD screen, heat-insulating glass, front and rear Fresnel lenses, etc.) are open to the outside air, making them prone to dust accumulation and affecting image quality. In closed optical engines, the internal optical components are completely isolated from the outside air, effectively preventing dust from adhering to the surface of the optical components. Compared with open optical engines, closed optical engines require additional heat exchange devices (such as profile heat exchangers, thermoelectric coolers, water-cooled heat exchangers, heat pipe heat exchangers, etc.) to transfer the heat absorbed by the optical components, keeping the component temperature, especially the LCD screen temperature, within the required temperature range, ensuring long-term stable and reliable operation of the equipment.

[0003] As the core component of a projector's imaging system, the LCD screen (liquid crystal display) generates a significant amount of heat during operation by absorbing light energy. This heat is typically cooled directly by forced airflow from a fan. To ensure the LCD screen's lifespan, its maximum operating temperature must be strictly limited (e.g., screen temperature should not exceed 75°C). Furthermore, because the optical properties of the LCD screen change with temperature, uneven color distribution in the image can occur. Therefore, the uniformity of temperature distribution within the LCD screen must be considered when designing the heat dissipation scheme. Utility Model Content

[0004] Based on this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a closed optical engine with uniform heat dissipation.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A sealed optical engine with uniform heat dissipation, comprising:

[0007] Imaging module, optical engine housing, internal circulation fan, heat dissipation module and external circulation fan unit;

[0008] The imaging module is disposed within the optical engine housing, which divides the interior of the optical engine housing into a transition air duct, a primary cooling air duct, and a secondary cooling air duct. The imaging module includes a first lens, a rear heat-insulating glass, an LCD screen, a front heat-insulating glass, and a second lens arranged sequentially along the light output direction. The transition air duct is located between the front heat-insulating glass and the second lens, the primary cooling air duct is located between the front heat-insulating glass and the LCD screen, and the secondary cooling air duct is located between the first lens and the LCD screen. The upper and lower ends of the primary cooling air duct are respectively connected to the upper end of the transition air duct and the lower end of the secondary cooling air duct.

[0009] The optical engine housing contains a heat exchange cavity, an air passage cavity, and a fan cavity that are connected sequentially from top to bottom. The heat exchange cavity is connected to the upper end of the secondary cooling air duct, the air passage cavity is located on the light-emitting side of the second lens, and the fan cavity is connected to the lower end of the transition air duct.

[0010] The internal circulation fan is installed in the fan cavity, and the airflow output from the outlet of the internal circulation fan enters the transition air duct.

[0011] The heat dissipation module includes a cold-end heat sink and a hot-end heat sink connected to each other to conduct heat. The hot-end heat sink is disposed in the heat exchange cavity, and the cold-end heat sink is disposed outside the optical engine housing.

[0012] The external circulation fan unit includes a first external circulation fan for heat dissipation of the cold end radiator.

[0013] In one implementation, the cross-sectional areas of the primary cooling duct and the secondary cooling duct perpendicular to the airflow direction are both smaller than the outlet area of ​​the internal circulation fan.

[0014] In one embodiment, the optical engine housing includes a flow guiding structure located at the air outlet of the internal circulation fan.

[0015] In one embodiment, the flow guiding structure includes a plurality of spaced-apart flow guiding plates.

[0016] In one embodiment, the sealed optical engine further includes a light source module and a light source heat sink for dissipating heat from the light source module. The light source module is disposed inside the optical engine housing and is used to emit light to the imaging module.

[0017] In one embodiment, the light source module includes a light funnel and an LED light source. The light-emitting side of the light funnel faces the first lens, the LED light source is disposed on the light-incident side of the light funnel, and the light source heat sink is in contact with the LED light source.

[0018] In one embodiment, the external circulation fan unit further includes a second external circulation fan for dissipating heat from the light source heat sink.

[0019] In one embodiment, the cold end heat sink is located on the air outlet side of the first external circulation fan, the second external circulation fan is located on the air outlet side of the cold end heat sink, and the light source heat sink is located on the air outlet side of the second external circulation fan.

[0020] In one embodiment, the internal circulation fan is a vortex fan, and the first external circulation fan and the second external circulation fan are both axial flow fans.

[0021] This application discloses an LCD projector, which includes a projection housing and a sealed optical engine with uniform heat dissipation as described above, disposed within the projection housing. The projection housing is provided with a plurality of ventilation holes.

[0022] In this embodiment, the internal air duct of the sealed optical engine is divided into a transition air duct, a primary cooling air duct, and a secondary cooling air duct. The uniformity of airflow distribution is improved by combining three measures: the swing angle of the internal circulation fan, the air guiding structure, and the transition air duct, thereby enhancing the uniformity of the horizontal temperature distribution of the LCD screen.

[0023] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the closed-loop optical engine in the embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the exploded structure of the sealed optomechanism in the embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the bottom structure of the sealed optical engine (with the lower housing hidden) in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the lower casing and internal circulation fan in an embodiment of this application;

[0028] Figure 5 This is a cross-sectional structural diagram of the closed optical engine in an embodiment of this application;

[0029] Figure 6 for Figure 5 Schematic diagram of airflow direction in the middle;

[0030] Explanation of reference numerals in the attached figures:

[0031] 11. First lens; 12. Rear heat-insulating glass; 13. LCD screen; 14. Front heat-insulating glass; 15. Second lens; 2. Optical engine housing; 201. Transition air duct; 202. Primary cooling air duct; 203. Secondary cooling air duct; 204. Heat exchange chamber; 205. Air passage chamber; 206. Fan chamber; 21. Upper housing; 22. Middle housing; 23. Lower housing; 231. Airflow guide structure; 232. Airflow guide plate; 24. Light source housing; 3. Internal circulation fan; 41. Hot end heat sink; 42. Cold end heat sink; 51. First external circulation fan; 52. Second external circulation fan; 6. Light source module; 61. Light funnel; 62. LED light source; 7. Light source heat sink. Detailed Implementation

[0032] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this utility model.

[0034] Please see Figures 1 to 6 This embodiment provides a closed-loop optical engine with uniform heat dissipation, which includes: an imaging module, an optical engine housing 2, an internal circulation fan 3, a heat dissipation module, an external circulation fan unit, and a light source module 6.

[0035] The imaging module is disposed within the optical engine housing 2, which divides the interior of the optical engine housing 2 into a transition air duct 201, a primary cooling air duct 202, and a secondary cooling air duct 203. The imaging module includes a first lens 11, a rear heat-insulating glass 12, an LCD screen 13, a front heat-insulating glass 14, and a second lens 15 arranged sequentially along the light output direction. The transition air duct 201 is located between the front heat-insulating glass 14 and the second lens 15. The primary cooling air duct 202 is located between the front heat-insulating glass 14 and the LCD screen 13. The secondary cooling air duct 203 is located between the first lens 11 and the LCD screen 13. The upper and lower ends of the primary cooling air duct 202 are respectively connected to the upper end of the transition air duct 201 and the lower end of the secondary cooling air duct 203. With this arrangement, the heat dissipation airflow can flow sequentially through the transition air duct 201, the primary cooling air duct 202, and the secondary cooling air duct 203 when it is transported. Understandably, the optical engine housing 2 may have partitions formed at the upper and lower ends of the primary cooling air duct 202 so that the transition air duct 201, the primary cooling air duct 202 and the secondary cooling air duct 203 are connected in sequence.

[0036] The optical engine housing 2 has a heat exchange chamber 204, an air passage chamber 205, and a fan chamber 206 connected sequentially from top to bottom. The heat exchange chamber 204 is connected to the upper end of the secondary cooling air duct 203. The air passage chamber 205 is located on the light-emitting side of the second lens 15. The fan chamber 206 is connected to the lower end of the transition air duct 201. The internal circulation fan 3 is disposed in the fan chamber 206, and the airflow output from the outlet of the internal circulation fan 3 enters the transition air duct 201.

[0037] Thus, the fan chamber 206, the transition air duct 201, the primary cooling air duct 202, the secondary cooling air duct 203, the heat exchange chamber 204, and the air passage chamber 205 are sequentially connected to form an internal circulation heat dissipation circuit. Driven by the internal circulation fan 3, the airflow can continuously circulate in the internal circulation heat dissipation circuit to achieve a good heat dissipation effect.

[0038] The heat dissipation module includes a hot-end heat sink 41 and a cold-end heat sink 42 connected to conduct heat. The hot-end heat sink 41 is disposed in the heat exchange cavity 204, and the cold-end heat sink 42 is disposed outside the optical engine housing 2.

[0039] The external circulation fan unit is located outside the optical engine housing 2, and the external circulation fan unit includes a first external circulation fan 51 for heat dissipation of the cold end heat sink 42.

[0040] Understandably, when the sealed optical engine is operating, the internal circulation fan 3 drives the air circulation flow of the internal circulation cooling circuit, such as... Figure 5-6 As shown, where Figure 6 The black arrows indicate the airflow direction. First, the airflow driven by the internal circulation fan 3 enters the transition air duct 201 to improve airflow uniformity. Then, the airflow turns 180° and enters the primary cooling air duct 202 from the top to carry away heat from one side of the LCD screen 13 and the front heat insulation glass 14 from top to bottom for the first heat dissipation. Correspondingly, the temperature of the side of the LCD screen 13 near the primary cooling air duct 202 will gradually increase from top to bottom. Next, when it reaches the lower end of the primary cooling air duct 202, the airflow turns 180° again and enters the secondary cooling air duct 203 to dissipate heat from the other side of the LCD screen 13. The heat from the side and rear heat-insulating glass and the first lens 11 is carried away from bottom to top for a second heat dissipation. The airflow direction in this secondary cooling air duct 203 is opposite to that in the primary cooling air duct 202. Consequently, the temperature of the LCD screen 13 on the side near the secondary cooling air duct 203 will gradually increase from bottom to top. Then, the airflow enters the heat exchange chamber 204 and conducts heat exchange with the hot end heat sink 41 to remove heat, thereby reducing the airflow temperature. Finally, after passing through the air chamber 205, it flows back to the fan chamber 206 to participate in the next cycle through the internal circulation fan 3.

[0041] Therefore, it can be seen that the sealed optical engine in this embodiment adopts the above design, where the temperature trends on both sides of the LCD screen 13 are complementary. This can significantly improve the phenomenon in existing unidirectional airflow LCD screens 13 where the temperature is low at the air inlet and high at the air outlet, thus improving the uniformity of the vertical temperature distribution of the LCD screen 13. It also extends the effective length of the internal circulation heat dissipation loop, allowing air to flow from the opposite direction.

[0042] The LCD screen 13 is adequately cooled by passing through both sides, which also saves internal space and facilitates the miniaturization of the optical engine. On the other hand, this embodiment forms a transition air duct 201 inside the optical engine housing 2, which can rectify the airflow output by the internal circulation fan 3 to improve the uniformity of airflow, thereby improving the uniformity of heat dissipation.

[0043] Since the hot end heat sink 41 will heat up during heat exchange, it is necessary to connect a cold end heat sink 42 outside the optical engine housing 2 to absorb the heat from the hot end heat sink 41. The cold end heat sink 42 can quickly remove the heat through the first external circulation fan 51, so that the hot end heat sink 41 is kept at a low temperature. This effectively achieves rapid heat dissipation of the LCD screen 13, effectively ensures the normal operation of the LCD screen 13 and the safety of the whole machine, and extends the service life of the LCD screen 13.

[0044] In this embodiment, the optical engine housing 2 includes an upper housing 21, a middle housing 22, a lower housing 23, and a light source housing 24. The upper housing 21 is installed on the top of the middle housing 22 to form the heat exchange cavity 204. The imaging module is disposed in the middle housing 22 to form the transition air duct 201, the primary cooling air duct 202, the secondary cooling air duct 203, and the air passage cavity 205. The lower housing 23 is installed at the bottom of the middle housing 22 to form the fan cavity 206. The light source housing 24 is installed on the side of the middle housing 22 to form the light source mounting cavity. The light source module 6 is disposed in the light source mounting cavity.

[0045] Preferably, in this embodiment, the cross-sectional areas of the primary cooling duct 202 and the secondary cooling duct 203 perpendicular to the airflow direction are both smaller than the outlet area of ​​the internal circulation fan 3. This arrangement allows the airflow to be accelerated within the primary cooling duct 202 and the secondary cooling duct 203, thereby increasing the convective heat transfer intensity on the surface of the LCD screen 13.

[0046] Preferably, the optical engine housing 2 in this embodiment includes a flow guiding structure 231 located at the air outlet of the internal circulation fan 3. Specifically, the flow guiding structure 231 is formed on the lower housing 23. The flow guiding structure 231 can perform preliminary rectification of the airflow output by the internal circulation fan 3 to further improve the uniformity of the airflow.

[0047] The airflow guiding structure 231 includes multiple spaced-apart guide plates 232. These guide plates 232 can divert the airflow output from the internal circulation fan 3 to adjust the airflow between the guide plates 232, thereby improving airflow uniformity. In this embodiment, the internal circulation fan 3 is a centrifugal vortex fan. The normal to the outlet plane of the internal circulation fan 3 forms a preset angle with the guide plate 232. This design takes into account the airflow distribution characteristics of the centrifugal fan outlet; placing the internal circulation fan 3 at a specific angle can better improve airflow uniformity.

[0048] The light source module 6 is disposed inside the optomechanical housing 2 and is used to emit light to the imaging module. In this embodiment, the sealed optomechanical system also includes a light source heat sink 7 for dissipating heat from the light source module 6.

[0049] The light source module 6 includes a light funnel 61 and an LED light source 62. The light-emitting side of the light funnel 61 faces the first lens 11, and the LED light source 62 is disposed on the light-incident side of the light funnel 61. The light source heat sink 7 is in contact with the LED light source 62. The light source heat sink 7 can dissipate heat from the LED light source 62 to effectively ensure the normal operation of the LED light source 62 and extend its service life. The light emitted by the LED light source 62 passes sequentially through the light funnel 61, the first lens 11, the rear heat-insulating glass 12, the LCD screen 13, the front heat-insulating glass 14, and the second lens 15 to form light carrying image information.

[0050] Furthermore, the external circulation fan unit also includes a second external circulation fan 52 for dissipating heat from the light source heat sink 7.

[0051] Specifically, the cold-end heat sink 42 is located on the outlet side of the first external circulation fan 51, the second external circulation fan 52 is located on the outlet side of the cold-end heat sink 42, and the light source heat sink 7 is located on the outlet side of the second external circulation fan 52. In other words, the airflow output by the first external circulation fan 51 passes through the cold-end heat sink 42, then enters the second external circulation fan 52, and finally blows onto the light source heat sink 7. This arrangement makes the overall flow path of the external circulation heat sink more reasonable, which is beneficial for energy saving and noise reduction, ensures heat dissipation effect, and makes the overall structure more compact.

[0052] Preferably, in this embodiment, the internal circulation fan 3 is a vortex fan, and the first external circulation fan 51 and the second external circulation fan 52 are both axial flow fans. Using such fans is suitable for the above-described structure, resulting in a more balanced external airflow.

[0053] In this embodiment, the internal air duct of the sealed optical engine is divided into a transition air duct 201, a primary cooling air duct 202, and a secondary cooling air duct 203. The uniformity of airflow distribution is improved by combining three measures: the swing angle of the internal circulation fan 3, the airflow guiding structure 231, and the transition air duct 201, thereby improving the uniformity of the horizontal temperature distribution of the LCD screen 13.

[0054] This embodiment also provides an LCD projector, which includes a projection housing and a sealed optical engine with uniform heat dissipation as described in this embodiment, disposed within the projection housing. The projection housing is provided with multiple ventilation holes. This LCD projector has the advantages of the sealed optical engine of this embodiment, which will not be elaborated here.

[0055] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A sealed optical engine with uniform heat dissipation, characterized in that, include: Imaging module, optical engine housing, internal circulation fan, heat dissipation module and external circulation fan unit; The imaging module is disposed within the optical engine housing, which divides the interior of the optical engine housing into a transition air duct, a primary cooling air duct, and a secondary cooling air duct. The imaging module includes a first lens, a rear heat-insulating glass, an LCD screen, a front heat-insulating glass, and a second lens arranged sequentially along the light output direction. The transition air duct is located between the front heat-insulating glass and the second lens, the primary cooling air duct is located between the front heat-insulating glass and the LCD screen, and the secondary cooling air duct is located between the first lens and the LCD screen. The upper and lower ends of the primary cooling air duct are respectively connected to the upper end of the transition air duct and the lower end of the secondary cooling air duct. The optical engine housing contains a heat exchange cavity, an air passage cavity, and a fan cavity that are connected sequentially from top to bottom. The heat exchange cavity is connected to the upper end of the secondary cooling air duct, the air passage cavity is located on the light-emitting side of the second lens, and the fan cavity is connected to the lower end of the transition air duct. The internal circulation fan is installed in the fan cavity, and the airflow output from the outlet of the internal circulation fan enters the transition air duct. The heat dissipation module includes a cold-end heat sink and a hot-end heat sink connected to each other to conduct heat. The hot-end heat sink is disposed in the heat exchange cavity, and the cold-end heat sink is disposed outside the optical engine housing. The external circulation fan unit includes a first external circulation fan for heat dissipation of the cold end radiator.

2. The uniformly heat-dissipating sealed optical engine according to claim 1, characterized in that: The cross-sectional area of ​​both the primary and secondary cooling ducts perpendicular to the airflow direction is smaller than the outlet area of ​​the internal circulation fan.

3. The uniformly heat-dissipating sealed optical engine according to claim 1, characterized in that: The optical engine housing includes a flow guiding structure located at the air outlet of the internal circulation fan.

4. The uniformly heat-dissipating sealed optical engine according to claim 3, characterized in that: The flow guiding structure includes multiple flow guiding plates arranged at intervals.

5. The hermetic optical engine with uniform heat dissipation according to claim 1, characterized in that: It also includes a light source module and a light source heat sink for dissipating heat from the light source module. The light source module is disposed inside the optomechanical housing and is used to emit light to the imaging module.

6. The hermetic optical engine with uniform heat dissipation according to claim 5, characterized in that: The light source module includes a light funnel and an LED light source. The light-emitting side of the light funnel faces the first lens, and the LED light source is disposed on the light-incident side of the light funnel. The heat sink of the light source is in contact with the LED light source.

7. The hermetic optical engine with uniform heat dissipation according to claim 5, characterized in that: The external circulation fan unit also includes a second external circulation fan for dissipating heat from the light source heat sink.

8. The hermetic optical engine with uniform heat dissipation according to claim 7, characterized in that: The cold end heat sink is located on the air outlet side of the first external circulation fan, the second external circulation fan is located on the air outlet side of the cold end heat sink, and the light source heat sink is located on the air outlet side of the second external circulation fan.

9. The hermetic optical engine with uniform heat dissipation according to claim 8, characterized in that: The internal circulation fan is a vortex fan, and the first and second external circulation fans are both axial flow fans.

10. An LCD projector, characterized in that, The projection housing includes a projection housing and a sealed optical engine with uniform heat dissipation as described in any one of claims 1-9 disposed within the projection housing, wherein the projection housing is provided with a plurality of ventilation holes.

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