A closed optical-mechanical device with bidirectional circulation of heat and an LCD projector

Abstract

The utility model relates to a kind of closed optical machine and LCD projector of bidirectional circulation heat dissipation, closed optical machine includes: optical machine shell, inner circulating fan unit, heat dissipation module, first outer circulating fan and projection module;Reflecting mirror is set in middle heat exchange cavity to separate middle heat exchange cavity into first part and second part, first part is communicated with the left end of second heat dissipation air duct, second part is communicated with the right end of second heat dissipation air duct by wind passage;The upper end of first heat dissipation air duct is communicated with middle heat exchange cavity, the lower end of first heat dissipation air duct is communicated with second accommodating cavity by first air vent, the first part and second part of middle heat exchange cavity are communicated with second accommodating cavity by second air vent;The position design of the present application through heat dissipation channel, each fan and radiator, and mutually cooperate to complete the heat dissipation of closed optical machine, not only improve the heat dissipation efficiency of projector, and make heat dissipation more uniform.

Description

Technical Field

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

[0002] The LCD optical engine (i.e., projection optical engine) is the most important component in an LCD projector. During the operation of the LCD optical engine, the LCD screen absorbs a lot of heat, so forced cooling of the LCD screen is required. LCD optical engines are mainly divided into two types according to the heat dissipation type: closed optical engines and open optical engines.

[0003] A sealed optical engine can effectively prevent dust and contaminants from entering the optical path, thus significantly reducing the impact of dust on the LCD screen. This allows the projection equipment to be more widely adapted to various applications and also greatly extends its lifespan. However, the enclosed environment poses a significant challenge to heat dissipation of the internal optical components. Efficiently removing internal heat without compromising the enclosed space is currently the key focus of optical engine heat dissipation.

[0004] Existing closed-loop optical engines typically use internal and external circulation to dissipate heat. However, their internal heat dissipation channels usually only pass through one side of the LCD screen, thus cooling that side of the LCD screen. This results in uneven heat dissipation on both sides of the LCD screen. In some designs, there are heat dissipation channels that pass through both sides of the LCD screen, but because the channels are singular, the air temperatures in the channels passing through the LCD screen are different or have large differences. This also easily leads to uneven heat dissipation on both sides of the LCD screen. Utility Model Content

[0005] 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 bidirectional circulating heat dissipation and an LCD projector.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A closed-loop optical engine with bidirectional circulating heat dissipation, comprising:

[0008] Optical engine housing, internal circulation fan unit, heat dissipation module, first external circulation fan, and projection module;

[0009] The optical engine housing includes a top shell, a middle shell, and a bottom shell connected sequentially from top to bottom. The top shell and the middle shell together enclose a first accommodating cavity, and the bottom shell and the middle shell together enclose a second accommodating cavity. The bottom of the middle shell is provided with a first ventilation opening and a second ventilation opening that pass through vertically. A partition and an imaging module are provided in the first accommodating cavity.

[0010] The imaging module includes a first lens, an LCD screen, and a polarizing element arranged sequentially along the light emission direction. The separator, the first lens, the LCD screen, and the polarizing element together divide the first accommodating cavity into a first heat dissipation duct, a second heat dissipation duct, a central heat exchange cavity, and an air passage. The first heat dissipation duct is located between the LCD screen and the first lens, the second heat dissipation duct is located between the LCD screen and the polarizing element, and the central heat exchange cavity is located on the side of the polarizing element facing away from the LCD screen.

[0011] The projection module includes a projection lens and a reflector. The projection lens is mounted on the optical engine housing. The reflector is used to reflect the light emitted from the imaging module to the projection lens. The reflector is mounted in the central heat exchange cavity to divide the central heat exchange cavity into a first part and a second part that are connected. The first part is connected to the left end of the second heat dissipation duct, and the second part is connected to the right end of the second heat dissipation duct through the air passage.

[0012] The upper end of the first heat dissipation duct is connected to the middle heat exchange chamber, and the lower end of the first heat dissipation duct is connected to the second accommodating chamber through the first vent. The first part and the second part of the middle heat exchange chamber are connected to the second accommodating chamber through the second vent.

[0013] The internal circulation fan unit includes a first internal circulation fan and a second internal circulation fan. The first internal circulation fan is disposed in the air passage, and the second internal circulation fan is disposed in the second accommodating cavity.

[0014] The heat dissipation module includes a cold end heat sink and a hot end heat sink. The cold end heat sink is disposed inside the optical engine housing and located above the central heat exchange cavity, while the hot end heat sink is disposed outside the optical engine housing.

[0015] The first external circulation fan is located on the outside of the optical engine housing and is used to dissipate heat from the hot end heat sink.

[0016] This application improves the heat dissipation efficiency of the projector and makes the heat dissipation more uniform by designing the heat dissipation channels, the positions of each fan and heat sink, and their cooperation.

[0017] In one embodiment, both the first internal circulation fan and the second internal circulation fan are dual-inlet vortex fans, and the dual-inlet vortex fan has two air inlets located on both sides of the fan blades.

[0018] In one embodiment, the bottom of the middle shell is also provided with an auxiliary vent that connects to the second accommodating cavity. The auxiliary vent corresponds to the first part of the middle heat exchange cavity. One air inlet of the second internal circulation fan is positioned opposite the second ventilation port, and the other air inlet of the second internal circulation fan is connected to the auxiliary air inlet.

[0019] As one implementation, the bidirectional circulating heat dissipation sealed optical engine further includes a light source module. The light source module includes an LED light source, a light funnel, and a light funnel housing. The light funnel housing is disposed on the middle shell, and the light funnel is disposed inside the light funnel housing. The light outlet of the light funnel faces the LCD screen, and the light inlet of the light funnel is provided with the LED light source.

[0020] As one implementation, the bidirectional circulating heat dissipation closed-loop optomechanism further includes an LED heat sink, which is used to dissipate heat from the LED light source.

[0021] In one embodiment, a first mounting shell is provided on the outside of the optical engine housing for mounting the first external circulation fan and the hot end heat sink.

[0022] As one implementation, the bidirectional circulating heat dissipation closed optical engine further includes a second external circulation fan. A second mounting shell is provided on the outside of the optical engine housing. The second external circulation fan and the LED heat sink are both arranged in the second mounting shell. The second external circulation fan is used to dissipate heat from the LED heat sink.

[0023] In one embodiment, both the first external circulation fan and the second external circulation fan are axial flow fans, and the axes of the first external circulation fan and the second external circulation fan are parallel.

[0024] In one implementation, the hot-end radiator and the cold-end radiator are connected by multiple heat pipes to conduct heat.

[0025] This application discloses an LCD projector, which includes a projection housing and a sealed optical engine with bidirectional circulating heat dissipation as described above, disposed within the projection housing.

[0026] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the closed-loop optical engine in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the exploded structure of the sealed optomechanism in the embodiments of this application;

[0029] Figure 3This is a schematic diagram of the structure of the sealed optical engine (with the top shell removed) in the embodiments of this application;

[0030] Figure 4 This is a side sectional view of the sealed optical engine in an embodiment of this application;

[0031] Figure 5 for Figure 4 Diagram of airflow direction in the middle;

[0032] Figure 6 This is a schematic diagram of the top portion of the sealed optical engine in an embodiment of this application;

[0033] Figure 7 for Figure 6 Diagram of airflow direction in the middle;

[0034] Explanation of reference numerals in the attached figures:

[0035] 11. Top shell; 12. Middle shell; 121. First vent; 122. Second vent; 123. Auxiliary vent; 13. Bottom shell; 141. First heat dissipation duct; 142. Second heat dissipation duct; 143. Middle heat exchange chamber; 1431. First part; 1432. Second part; 144. Air passage; 15. Second receiving cavity; 16. Separator; 17. First mounting shell; 18. Second mounting shell; 21. 1. Lens; 22. Heat-insulating glass; 23. LCD screen; 24. Polarizing element; 25. Second lens; 31. First internal circulation fan; 32. Second internal circulation fan; 41. Cold end heat sink; 42. Hot end heat sink; 51. First external circulation fan; 52. Second external circulation fan; 61. LED light source; 62. Light funnel; 63. Light funnel housing; 64. LED heat sink; 71. Reflector; 72. Projection lens. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] Please see Figures 1 to 7 This application provides a closed-loop optical engine with bidirectional circulating heat dissipation, including an optical engine housing, an internal circulating fan unit, a heat dissipation module, a first external circulating fan 51, and a projection module.

[0039] The optical engine housing includes a top shell 11, a middle shell 12, and a bottom shell 13 connected sequentially from top to bottom. The top shell 11 has a plate-like structure, and the middle shell 12 and the bottom shell 13 are both basin-shaped structures with upward openings. The top shell 11 and the middle shell 12 together enclose a first accommodating cavity, and the bottom shell 13 and the middle shell 12 together enclose a second accommodating cavity 15. The bottom of the middle shell 12 is provided with a first ventilation opening 121 and a second ventilation opening 122 that run vertically through each other. A partition 16 and an imaging module are provided in the first accommodating cavity.

[0040] The imaging module includes a first lens 21, an LCD screen 23, and a polarizing element 24 arranged sequentially along the light emission direction. The separator 16 may include a partition and an LCD mounting bracket, or any structure that can achieve the separation effect. The first lens 21 is a rear Fresnel lens. The separator 16, the first lens 21, the LCD screen 23, and the polarizing element 24 together divide the first accommodating cavity into a first heat dissipation duct 141, a second heat dissipation duct 142, a central heat exchange cavity 143, and an air passage 144. The first heat dissipation duct 141 is located between the LCD screen 23 and the first lens 21, the second heat dissipation duct 142 is located between the LCD screen 23 and the polarizing element 24, and the central heat exchange cavity 143 is located on the side of the polarizing element 24 facing away from the LCD screen 23.

[0041] The projection module includes a projection lens 72 and a reflector 71. The projection lens 72 is mounted on the optical engine housing. The reflector 71 is used to reflect the light emitted from the imaging module to the projection lens 72. The reflector 71 is disposed in the central heat exchange cavity 143 to divide the central heat exchange cavity 143 into a first part 1431 and a second part 1432 that are connected. The first part 1431 is connected to the left end of the second heat dissipation duct 142, and the second part 1432 is connected to the right end of the second heat dissipation duct 142 through the air passage 144.

[0042] The upper end of the first heat dissipation duct 141 is connected to the middle heat exchange cavity 143, and the lower end of the first heat dissipation duct 141 is connected to the second accommodating cavity 15 through the first vent 121. The first part 1431 and the second part 1432 of the middle heat exchange cavity 143 are connected to the second accommodating cavity 15 through the second vent 122. With the above arrangement, the upper end of the first heat dissipation duct 141, the middle heat exchange cavity 143, the second vent 122, the second accommodating cavity 15, the first vent 121, and the lower end of the first heat dissipation duct 141 are sequentially connected to form a vertical circulating heat dissipation channel. The left end of the second heat dissipation duct 142, the first part 1431 of the middle heat exchange cavity 143, the second part 1432 of the middle heat exchange cavity 143, the air passage 144, and the right end of the second heat dissipation duct 142 are sequentially connected to form a horizontal circulating heat dissipation channel.

[0043] The internal circulation fan unit includes a first internal circulation fan 31 and a second internal circulation fan 32. The first internal circulation fan 31 is disposed within the air passage 144, and the second internal circulation fan 32 is disposed within the second accommodating cavity 15. Therefore, with the above arrangement, a first heat dissipation air passage 141 and a second heat dissipation air passage 142 can be formed on opposite sides of the LCD screen 23 to dissipate heat from the LCD screen 23. Furthermore, the first heat dissipation air passage 141 and the second heat dissipation air passage 142 respectively participate in forming a vertical circulation heat dissipation channel and a horizontal circulation heat dissipation channel, ensuring sufficient heat dissipation efficiency. Both the horizontal and vertical circulation heat dissipation channels share a central heat exchange cavity 143. Therefore, the two airflows will disturb each other and undergo heat and mass exchange in the central heat exchange cavity 143. This prevents excessive temperature differences between the horizontal and vertical circulation flow fields, thus avoiding excessive differences in component heat dissipation efficiency.

[0044] The heat dissipation module includes a cold-end heat sink 41 and a hot-end heat sink 42. Specifically, the hot-end heat sink 42 and the cold-end heat sink 41 are connected by multiple heat pipes to conduct heat. The cold-end heat sink 41 is disposed inside the optical engine housing and above the central heat exchange cavity 143, while the hot-end heat sink 42 is disposed outside the optical engine housing. The cold-end heat sink 41 can provide a cold source to the central heat exchange cavity 143 and participate in the heat exchange of the horizontal and vertical circulating heat dissipation channels.

[0045] The first external circulation fan 51 is located on the outside of the optical engine housing and is used to dissipate heat from the hot end heat sink 42.

[0046] Understandably, when a sealed optical engine is working, on the one hand, such as Figure 4 and 5 As shown, where Figure 5 The black arrows in the diagram represent the air circulation trajectory of the vertical circulating heat dissipation channel. The second internal circulation fan 32 drives the air circulation flow in the vertical circulating heat dissipation channel, causing the air to carry away the heat from the LCD screen 23 and the first lens 21 from the first heat dissipation duct 141. The air then flows through the central heat exchange chamber 143 and is discharged by the cold-end heat sink 41. It then flows back to the second accommodating cavity 15 through the second vent 122 and enters the air inlet of the second internal circulation fan 32. The second internal circulation fan 32 then drives the air to enter the first heat dissipation duct 141 from the first vent 121 to continue circulating. On the other hand, as... Figure 6 and 7 As shown, where Figure 7 The black arrows in the diagram represent the air circulation trajectory of the horizontal circulating heat dissipation channel. The first internal circulation fan 31 drives the air circulation flow of the horizontal circulating heat dissipation channel, causing the air in the second part 1432 of the central heat exchange chamber 143 to be drawn in (because there is a cold end heat sink 41 at the top of the central heat exchange chamber 143, the temperature is relatively low), and blown into the right end of the second heat dissipation air duct 142, carrying away the heat from the LCD screen 23 and polarizing element 24. Then, the air flows through the first part 1431 of the central heat exchange chamber 143 to dissipate the heat using the cold end heat sink 41. Then, a part of the air is drawn in by the second vent 122, and the other part passes through the second part 1432 of the central heat exchange chamber 143 and re-enters the air passage 144 to continue participating in the next cycle.

[0047] It should be noted that both the horizontal and vertical circulating heat dissipation channels share the central heat exchange chamber 143. Therefore, the two airflows will turbulently interact and exchange heat and mass within the central heat exchange chamber 143. This prevents excessive temperature differences between the horizontal and vertical circulating flow fields, thus avoiding significant differences in component heat dissipation efficiency. Furthermore, the first external circulation fan 51 cools the hot-end heat sink 42 outside the optical engine housing, allowing the cold-end heat sink 41 to maintain a lower temperature, which is beneficial for improving heat dissipation efficiency.

[0048] This application achieves heat dissipation of the sealed optical engine through the design of heat dissipation channels, the positions of each fan and heat sink, and their cooperation. This not only improves the heat dissipation efficiency of the projector and reduces the overall power consumption and size of the projector, but also ensures the safe and stable operation of the projector. It can balance the airtightness of the optical engine, the high efficiency of heat dissipation, the compactness of the structure, and the safety and stability. The sealed optical engine of this application can be widely used in various projectors that use sealed optical engines.

[0049] Preferably, both the first internal circulation fan 31 and the second internal circulation fan 32 are dual-inlet vortex fans, each having two air inlets located on either side of the fan blades. Using dual-inlet vortex fans avoids the high noise associated with high speeds, increases airflow to meet the heat and mass exchange requirements of high-heat systems, and effectively adjusts and controls the temperature uniformity of the LCD screen 23.

[0050] Specifically, the bottom of the middle shell 12 is also provided with an auxiliary vent 123 that connects to the second accommodating cavity 15. The auxiliary vent 123 corresponds to the first part 1431 of the middle heat exchange cavity 143. One air inlet of the second internal circulation fan 32 is set directly opposite the second ventilation port 122, and the other air inlet of the second internal circulation fan 32 is connected to the auxiliary air inlet.

[0051] This embodiment of the bidirectional circulating heat dissipation sealed optical engine also includes a light source module. The light source module includes an LED light source 61, a light funnel 62, and a light funnel housing 63. The light funnel housing 63 is disposed on the middle shell 12, and the light funnel 62 is disposed inside the light funnel housing 63. The light outlet of the light funnel 62 faces the LCD screen 23, and the light inlet of the light funnel 62 houses the LED light source 61. The imaging module also includes a heat-insulating glass 22 and a second lens 25. The heat-insulating glass 22 is disposed between the first lens 21 and the LCD screen 23, and the second lens 25 is disposed on the side of the polarizing element 24 facing away from the LCD screen 23. Thus, the light emitted from the LED light source 61 passes sequentially through the light funnel 62, the first lens 21, the heat-insulating glass 22, the LCD screen 23, the polarizing element 24, the second lens 25, and the reflector 71 before exiting from the projection lens 72 to form a projected image.

[0052] This embodiment of the bidirectional circulating heat dissipation closed-loop optomechanism also includes an LED heat sink 64, which is used to dissipate heat from the LED light source 61. This effectively ensures the normal operation of the LED light source 61 and extends its service life.

[0053] Specifically, the outer side of the optical engine housing is provided with a first mounting shell 17 for mounting the first external circulation fan 51 and the hot end heat sink 42.

[0054] Preferably, the closed-loop optical engine with bidirectional circulating heat dissipation in this embodiment further includes a second external circulation fan 52. A second mounting shell 18 is provided on the outside of the optical engine housing. The second external circulation fan 52 and the LED heat sink 64 are both arranged in the second mounting shell 18. The second external circulation fan 52 is used to dissipate heat from the LED heat sink 64.

[0055] Both the first external circulation fan 51 and the second external circulation fan 52 are axial flow fans, and their axes are parallel. This arrangement helps to make the external cooling airflow design more reasonable.

[0056] This embodiment also provides an LCD projector, which includes a projection housing and a closed-loop optical engine with bidirectional circulating heat dissipation as described in the above embodiment, disposed within the projection housing. Projectors using the closed-loop optical engine of this embodiment are advantageous for miniaturization design, and offer good heat dissipation and high sealing performance.

[0057] 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 hermetically sealed light engine with bidirectional circulation heat dissipation, characterized in that, include: Optical engine housing, internal circulation fan unit, heat dissipation module, first external circulation fan, and projection module; The optical engine housing includes a top shell, a middle shell, and a bottom shell connected sequentially from top to bottom. The top shell and the middle shell together enclose a first accommodating cavity, and the bottom shell and the middle shell together enclose a second accommodating cavity. The bottom of the middle shell is provided with a first ventilation opening and a second ventilation opening that pass through vertically. A partition and an imaging module are provided in the first accommodating cavity. The imaging module includes a first lens, an LCD screen, and a polarizing element arranged sequentially along the light emission direction. The separator, the first lens, the LCD screen, and the polarizing element together divide the first accommodating cavity into a first heat dissipation duct, a second heat dissipation duct, a central heat exchange cavity, and an air passage. The first heat dissipation duct is located between the LCD screen and the first lens, the second heat dissipation duct is located between the LCD screen and the polarizing element, and the central heat exchange cavity is located on the side of the polarizing element facing away from the LCD screen. The projection module includes a projection lens and a reflector. The projection lens is mounted on the optical engine housing. The reflector is used to reflect the light emitted from the imaging module to the projection lens. The reflector is mounted in the central heat exchange cavity to divide the central heat exchange cavity into a first part and a second part that are connected. The first part is connected to the left end of the second heat dissipation duct, and the second part is connected to the right end of the second heat dissipation duct through the air passage. The upper end of the first heat dissipation duct is connected to the middle heat exchange chamber, and the lower end of the first heat dissipation duct is connected to the second accommodating chamber through the first vent. The first part and the second part of the middle heat exchange chamber are connected to the second accommodating chamber through the second vent. The internal circulation fan unit includes a first internal circulation fan and a second internal circulation fan. The first internal circulation fan is disposed in the air passage, and the second internal circulation fan is disposed in the second accommodating cavity. The heat dissipation module includes a cold end heat sink and a hot end heat sink. The cold end heat sink is disposed inside the optical engine housing and located above the central heat exchange cavity, while the hot end heat sink is disposed outside the optical engine housing. The first external circulation fan is located on the outside of the optical engine housing and is used to dissipate heat from the hot end heat sink.

2. The closed-loop optical engine with bidirectional circulating heat dissipation according to claim 1, characterized in that: Both the first internal circulation fan and the second internal circulation fan are dual-inlet vortex fans, and the dual-inlet vortex fan has two air inlets located on both sides of the fan blades.

3. The closed-loop optical engine with bidirectional circulating heat dissipation according to claim 2, characterized in that: The bottom of the middle shell is also provided with an auxiliary vent that connects to the second accommodating cavity. The auxiliary vent corresponds to the first part of the middle heat exchange cavity. One air inlet of the second internal circulation fan is set directly opposite the second ventilation port, and the other air inlet of the second internal circulation fan is connected to the auxiliary air inlet.

4. The closed-loop optical engine with bidirectional circulating heat dissipation according to claim 1, characterized in that: It also includes a light source module, which includes an LED light source, a light funnel, and a light funnel housing. The light funnel housing is disposed on the middle shell, and the light funnel is disposed inside the light funnel housing. The light outlet of the light funnel faces the LCD screen, and the light inlet of the light funnel is provided with the LED light source.

5. The closed-loop optical engine with bidirectional circulating heat dissipation according to claim 4, characterized in that: It also includes an LED heat sink, which is used to dissipate heat from the LED light source.

6. The closed-loop optical engine with bidirectional circulating heat dissipation according to claim 5, characterized in that: The outer side of the optical engine housing is provided with a first mounting shell for installing the first external circulation fan and the hot end heat sink.

7. The closed-loop optical engine with bidirectional circulating heat dissipation according to claim 6, characterized in that: It also includes a second external circulation fan. A second mounting shell is provided on the outside of the optical engine housing. The second external circulation fan and the LED heat sink are both arranged in the second mounting shell. The second external circulation fan is used to dissipate heat from the LED heat sink.

8. The closed-loop optical engine with bidirectional circulating heat dissipation according to claim 7, characterized in that: Both the first external circulation fan and the second external circulation fan are axial flow fans, and the axes of the first external circulation fan and the second external circulation fan are parallel.

9. The hermetic optical engine with bidirectional circulating heat dissipation according to any one of claims 1-8, characterized in that: The hot-end radiator and the cold-end radiator are connected by multiple heat pipes to conduct heat.

10. An LCD projector characterized by comprising: It includes a projection housing and a closed-loop optical engine with bidirectional circulating heat dissipation as described in any one of claims 1-9, disposed within the projection housing.

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