Closed ray machine with double fans for circular heat dissipation and LCD projector

Abstract

The utility model relates to a closed light machine and LCD projector of double fan circulation heat dissipation, including: light machine shell, internal circulation fan set, heat dissipation module and external circulation fan, light machine shell includes top shell, middle shell and bottom shell that connect in proper order from top to bottom, top shell and middle shell together enclose a first accommodation cavity, and the bottom shell is equipped with the bottom shell, the first accommodation cavity is equipped with the internal circulation fan set, the heat dissipation module is equipped with the external circulation fan set, and the external circulation fan set is equipped with the external circulation fan set. The bottom shell and the middle shell jointly define a second containing cavity, a first ventilation opening and a second ventilation opening are formed in the bottom of the middle shell, and a partition piece and an imaging module are arranged in the first containing cavity. According to the invention, through the position design of the heat dissipation channel, the fans and the radiator and the mutual cooperation, the heat dissipation of the closed light machine is completed, the heat dissipation efficiency of the projector is improved, the overall power consumption and the size of the projector are reduced, and the projector can be ensured to operate safely and stably; the sealing performance of the optical machine, the high efficiency of heat dissipation, the compactness of the structure, and the safety and stability can be considered.

Description

Technical Field

[0001] This utility model relates to the field of LCD projector technology, and in particular to a closed optical engine with dual-fan 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. Their internal circulation cooling mainly uses a fan and heat sink to remove heat from the LCD screen. However, the cooling effect of a single fan and a single circulation path is insufficient to handle the cooling of high-power optical engines. Therefore, it is necessary to design a closed-loop optical engine with higher cooling efficiency. 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 dual-fan 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 dual-fan circulating heat dissipation, comprising:

[0008] The device includes an optical engine housing, an internal circulation fan unit, a heat dissipation module, and an external circulation fan. 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. A partition and an imaging module are provided in the first accommodating cavity.

[0009] The imaging module includes a first lens, an LCD screen, and a second lens arranged sequentially along the light emission direction. The separator, the first lens, the LCD screen, and the second lens together divide the first accommodating cavity into a first heat dissipation duct, a second heat dissipation duct, a central air passage cavity, a heat exchange cavity, and a fan accommodating cavity. The LCD screen has a first side and a second side opposite to each other. The first heat dissipation duct is located on the first side of the LCD screen, and the second heat dissipation duct is located on the second side of the LCD screen.

[0010] The right end of the first heat dissipation duct, the heat exchange chamber, the middle air passage chamber, the fan housing chamber, and the left end of the first heat dissipation duct are connected in sequence to form a horizontal circulating heat dissipation channel. The top end of the second heat dissipation duct, the middle air passage chamber, the first vent, the second housing chamber, the second vent, and the bottom end of the second heat dissipation duct are connected in sequence to form a vertical circulating heat dissipation channel.

[0011] The internal circulation fan unit includes a first internal circulation fan and a second internal circulation fan, wherein the first internal circulation fan is disposed in the fan accommodating cavity and the second internal circulation fan is disposed in the second accommodating cavity;

[0012] The heat dissipation module includes a cold-end heat sink and a hot-end heat sink connected to each other for heat exchange. The cold-end heat sink is disposed in the heat exchange cavity, and the hot-end heat sink is disposed outside the first accommodating cavity and the second accommodating cavity.

[0013] The external circulation fan is located outside the first and second accommodating cavities and is used to dissipate heat from the hot end radiator.

[0014] In one embodiment, 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 second lens, and the central air passage is located on the side of the second lens facing away from the LCD screen.

[0015] In one embodiment, the separator includes an imaging mounting bracket, which is detachably fixed to the middle shell. The top ends of the LCD screen and the second lens are both fixed to the imaging mounting bracket. The imaging mounting bracket closes the top end of the first heat dissipation duct and provides an air vent at the top end of the corresponding second heat dissipation duct.

[0016] In one embodiment, the cold-end radiator and the hot-end radiator are integrally formed, and the side wall of the middle shell is provided with a radiator mounting port corresponding to the position of the heat exchange cavity, and the heat dissipation module is installed in the radiator mounting port.

[0017] In one embodiment, the sealed optical engine further includes a light source module, which includes an LED light source and a light funnel. The light funnel is disposed on the side of the first lens away from the LCD screen, with the light outlet of the light funnel facing the LCD screen and the light inlet of the light funnel being provided with the LED light source.

[0018] In one embodiment, the sealed optical engine further includes an LED heat sink for dissipating heat from the LED light source. The outlet of the external circulation fan faces the LED heat sink, and the inlet of the external circulation fan faces the hot end heat sink.

[0019] In one embodiment, the optical engine housing further includes an optical funnel shell, which is fitted over the LED light source, the optical funnel, the LED heat sink, and the outside of the light source.

[0020] In one embodiment, the light funnel casing also forms an external circulation air duct, in which the external circulation fan and the LED heat sink are both disposed.

[0021] In one implementation, the first internal circulation fan, the second internal circulation fan, and the external circulation fan are all vortex fans.

[0022] The purpose of this application is to achieve heat dissipation of a sealed optical engine without using semiconductor cooling chips and liquid cooling, through the design of heat dissipation channels, the positions of each fan and heat sink, and their mutual 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.

[0023] This application also provides an LCD projector, which includes a housing and a closed optical engine with dual-fan circulating heat dissipation as described above, installed in the housing.

[0024] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the closed-loop optical engine with dual-fan circulating heat dissipation in the embodiments of this application;

[0026] Figure 2 This is an exploded structural diagram of a closed-loop optomechanis with dual-fan circulating heat dissipation in an embodiment of this application.

[0027] Figure 3 This is a top cross-sectional view of a closed-loop optical engine with dual-fan circulating heat dissipation in an embodiment of this application.

[0028] Figure 4 This is a side cross-sectional view of a closed-loop optical engine with dual-fan circulating heat dissipation in an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 11. Top shell; 12. Middle shell; 121. First vent; 122. Second vent; 123. Radiator mounting port; 13. Bottom shell; 141. First heat dissipation duct; 142. Second heat dissipation duct; 143. Central air passage cavity; 144. Heat exchange cavity; 145. Fan housing cavity; 15. Second housing cavity; 16. Separator; 161. Imaging mounting bracket; 160. Air passage; 17. Light funnel shell; 191. External circulation duct; 21. First lens; 22. Heat insulation glass; 23. LCD screen; 24. Second lens; 31. First internal circulation fan; 32. Second internal circulation fan; 4. Heat dissipation module; 41. Cold end radiator; 42. Hot end radiator; 5. External circulation fan; 61. LED light source; 62. Light funnel; 7. LED radiator; 8. Projection lens. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] Please see Figures 1 to 4 This embodiment provides a closed optical engine with dual-fan circulating heat dissipation, which includes an optical engine housing, an internal circulating fan unit, a heat dissipation module 4, and an external circulating fan 5.

[0034] 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 and the middle shell 12 together enclose a first receiving cavity, and the bottom shell 13 and the middle shell 12 together enclose a second receiving cavity 15. The bottom of the middle shell 12 is provided with a first ventilation opening 121 and a second ventilation opening 122. A partition 16 and an imaging module are disposed within the first receiving cavity. The top shell 11 has a plate-like structure, while the middle shell 12 and the bottom shell 13 are both open-topped, basin-shaped structures. The top shell 11 covers the opening of the middle shell 12 to jointly enclose the first receiving cavity, and the opening of the bottom shell 13 is aligned with the bottom of the middle shell 12 to jointly enclose the second receiving cavity 15.

[0035] The imaging module includes a first lens 21, an LCD screen 23, and a second lens 24 arranged sequentially along the light emission direction. The first lens 21 is a rear Fresnel lens, and the second lens 24 is a front Fresnel lens. The separator 16 may include a partition plate within the middle shell 12 and an imaging mounting bracket 161, etc., as long as they can achieve the separation effect. The separator 16, the first lens 21, the LCD screen 23, and the second lens 24 together divide the first accommodating cavity into a first heat dissipation duct 141, a second heat dissipation duct 142, a central air passage cavity 143, a heat exchange cavity 144, and a fan accommodating cavity 145. The LCD screen 23 has a first side and a second side, with the first heat dissipation duct 141 located on the first side of the LCD screen 23 and the second heat dissipation duct 142 located on the second side of the LCD screen 23. The first heat dissipation duct 141 is a channel that connects left and right, and the second heat dissipation duct 142 is a channel that connects up and down. When the airflow flows through the first heat dissipation duct 141 and the second heat dissipation duct 142, it can dissipate heat on both sides of the LCD screen 23 at the same time, which greatly improves the effect.

[0036] The right end of the first heat dissipation duct 141, the heat exchange chamber 144, the middle air passage chamber 143, the fan housing chamber 145, and the left end of the first heat dissipation duct 141 are sequentially connected to form a horizontal circulating heat dissipation channel. The top end of the second heat dissipation duct 142, the middle air passage chamber 143, the first vent 121, the second housing chamber 15, the second vent 122, and the bottom end of the second heat dissipation duct 142 are sequentially connected to form a vertical circulating heat dissipation channel. Specifically, in this embodiment, 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 second lens 24, and the middle air passage chamber 143 is located on the side of the second lens 24 facing away from the LCD screen 23. That is to say, the first side of the LCD screen 23 faces the first lens 21, and the second side of the LCD screen 23 faces the second lens 24, which makes the overall layout more reasonable and the heat dissipation efficiency higher. Of course, in some other embodiments, the positions of the first heat dissipation duct 141 and the second heat dissipation duct 142 can be reversed compared to this embodiment. That is, the first heat dissipation duct 141 is located between the LCD screen 23 and the second lens 24, and the second heat dissipation duct 142 is located between the LCD screen 23 and the first lens 21. Such a setting can be achieved by simply adjusting the specific separation position of the separator 16, and will not affect the overall heat dissipation efficiency.

[0037] 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 fan housing cavity 145 and is used to drive air circulation in the horizontal circulation heat dissipation channel. The second internal circulation fan 32 is disposed within the second housing cavity 15 and is used to drive air circulation in the vertical circulation heat dissipation channel. Therefore, with the above arrangement, the first heat dissipation air duct 141 and the second heat dissipation air duct 142 formed on opposite sides of the LCD screen 23 dissipate heat from the LCD screen 23. Furthermore, the first heat dissipation air duct 141 and the second heat dissipation air duct 142 respectively participate in forming the horizontal circulation heat dissipation channel and the vertical circulation heat dissipation channel, ensuring sufficient heat dissipation efficiency. Both the horizontal and vertical circulation heat dissipation channels share a central air passage cavity 143. Therefore, the two airflows will disturb each other and undergo heat and mass exchange in the central air passage cavity 143. This prevents excessive temperature difference between the horizontal and vertical circulation flow fields, thus avoiding excessive differences in component heat dissipation efficiency.

[0038] The heat dissipation module 4 includes a cold-end heat sink 41 and a hot-end heat sink 42 connected for heat exchange. The cold-end heat sink 41 is disposed in the heat exchange cavity 144, and the hot-end heat sink 42 is disposed outside the first and second accommodating cavities 15. Due to the presence of the central air passage 143, the cold-end heat sink 41 can provide a cold source to the central air passage 143 and participate in the heat exchange between the horizontal and vertical circulating heat dissipation channels.

[0039] The external circulation fan 5 is located outside the first and second accommodating cavities 15 and is used to dissipate heat from the hot end radiator 42.

[0040] Understandably, when a sealed optical engine is working, on the one hand, such as Figure 3 As shown, where Figure 3 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 in the horizontal 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 heat exchange chamber 144, where the cold-end radiator 41 first removes the heat and cools it down into cold air. After flowing through the middle air passage 143, a portion of the cold air flows into the fan housing 145 and is drawn in by the first internal circulation fan 31 to continue circulating. The other portion of the cold air is drawn in by the second internal circulation fan 32 and flows into the second housing 15. Figure 4 As shown, where Figure 4 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 cold air to circulate along the vertical circulating heat dissipation channel, so that the cold air carries away the heat from the LCD screen 23 and the second lens 24 from the second heat dissipation duct 142, and finally flows back to the middle air passage 143 to continue to participate in the flow of the horizontal circulating heat dissipation channel, and the other part continues to participate in the flow of the vertical circulating heat dissipation channel.

[0041] It should be noted that both the horizontal and vertical circulating heat dissipation channels share the central air passage 143. Therefore, the two airflows will turbulently interact and exchange heat and mass within the central air passage 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 external circulation fan 5 dissipates heat from the hot-end radiator 42, keeping the cold-end radiator 41 at a lower temperature, which is beneficial for improving heat dissipation efficiency.

[0042] As can be seen from the above, the purpose of this application is to achieve heat dissipation of a closed-loop optical engine without using semiconductor cooling chips and liquid cooling, through the design of heat dissipation channels, the positions of each fan and heat sink, and their mutual 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 take into account the airtightness of the optical engine, the high efficiency of heat dissipation, the compactness of the structure, and the safety and stability. The closed-loop optical engine of this application can be widely used in various projectors that use closed-loop optical engines.

[0043] Specifically, in this embodiment, the separator 16 includes an imaging mounting bracket 161, which is detachably fixed to the middle shell 12. The top ends of the LCD screen 23 and the second lens 24 are both fixed to the imaging mounting bracket 161. The imaging mounting bracket 161 closes the top end of the first heat dissipation duct 141, and an air vent 160 is provided at the top end of the corresponding second heat dissipation duct 142. The imaging mounting bracket 161 can fix the LCD screen 23 and the second lens 24, making it convenient to use.

[0044] Preferably, the cold end radiator 41 and the hot end radiator 42 are integrally formed, resulting in better heat conduction. The side wall of the middle shell 12 is provided with a radiator mounting port 123 corresponding to the position of the heat exchange cavity 144. The heat dissipation module 4 is installed in the radiator mounting port 123 to close the radiator mounting port 123. This arrangement allows the heat dissipation module 4 to be part of the middle shell 12, thus enclosing the middle shell 12, improving the rationality of the position arrangement, and optimizing the structural design.

[0045] Preferably, the sealed optical engine in this embodiment further includes a light source module, which includes an LED light source 61 and a light funnel 62. An opening is provided on the side wall of the middle shell 12 corresponding to the LCD screen 23, and a first lens 21 is installed at this opening. The light funnel 62 is located on the side of the first lens 21 facing away from the LCD screen 23, with its light outlet facing the LCD screen 23 and the LED light source 61 located at its light inlet. The imaging module further includes heat-insulating glass 22 disposed between the first lens 21 and the LCD screen 23. The sealed optical engine also includes a projection module. 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, and the second lens 24 before exiting from the projection lens 8 to form a projected image.

[0046] Preferably, the sealed optical engine in this embodiment further includes an LED heat sink 7, which is used to dissipate heat from the LED light source 61. The air outlet of the external circulation fan 5 faces the LED heat sink 7, and the air inlet of the external circulation fan 5 faces the hot end heat sink 42. This effectively ensures the normal operation of the LED light source 61 and extends its service life.

[0047] Preferably, the optical engine housing further includes an optical funnel shell 17, which is fitted over the LED light source 61, the optical funnel 62, and the LED heat sink 7. The optical funnel shell 17 also forms an external circulation air duct 191, in which the external circulation fan 5 and the LED heat sink 7 are both disposed, thereby making the external circulation airflow smoother and improving the external circulation heat dissipation efficiency.

[0048] Preferably, the first internal circulation fan 31, the second internal circulation fan 32, and the external circulation fan 5 are all vortex fans. This arrangement helps to make the overall structural design more reasonable.

[0049] This embodiment also provides an LCD projector, which includes a housing and a sealed optical engine with dual-fan circulating heat dissipation, as described in this embodiment, installed within the housing. The housing has multiple ventilation holes. The projector using the sealed optical engine of this embodiment is advantageous for miniaturization, and offers good heat dissipation and high sealing performance.

[0050] 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 closed-loop optical engine with dual-fan circulating heat dissipation, characterized in that, include: The device includes an optical engine housing, an internal circulation fan unit, a heat dissipation module, and an external circulation fan. 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. 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 second lens arranged sequentially along the light emission direction. The separator, the first lens, the LCD screen, and the second lens together divide the first accommodating cavity into a first heat dissipation duct, a second heat dissipation duct, a central air passage cavity, a heat exchange cavity, and a fan accommodating cavity. The LCD screen has a first side and a second side opposite to each other. The first heat dissipation duct is located on the first side of the LCD screen, and the second heat dissipation duct is located on the second side of the LCD screen. The right end of the first heat dissipation duct, the heat exchange chamber, the middle air passage chamber, the fan housing chamber, and the left end of the first heat dissipation duct are connected in sequence to form a horizontal circulating heat dissipation channel. The top end of the second heat dissipation duct, the middle air passage chamber, the first vent, the second housing chamber, the second vent, and the bottom end of the second heat dissipation duct are connected in sequence to form a vertical circulating heat dissipation channel. The internal circulation fan unit includes a first internal circulation fan and a second internal circulation fan, wherein the first internal circulation fan is disposed in the fan accommodating cavity 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 connected to each other for heat exchange. The cold-end heat sink is disposed in the heat exchange cavity, and the hot-end heat sink is disposed outside the first accommodating cavity and the second accommodating cavity. The external circulation fan is located outside the first and second accommodating cavities and is used to dissipate heat from the hot end radiator.

2. The closed-loop optical engine with dual-fan circulating heat dissipation according to claim 1, characterized in that: 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 second lens, and the central air passage is located on the side of the second lens that faces away from the LCD screen.

3. The closed-loop optical engine with dual-fan circulating heat dissipation according to claim 1, characterized in that: The separator includes an imaging mounting bracket, which is detachably fixed to the middle shell. The top ends of the LCD screen and the second lens are both fixed on the imaging mounting bracket. The imaging mounting bracket closes the top end of the first heat dissipation duct and provides an air vent at the top end of the corresponding second heat dissipation duct.

4. The closed-loop optical engine with dual-fan circulating heat dissipation according to claim 1, characterized in that: The cold end radiator and the hot end radiator are integrated. The side wall of the middle shell is provided with a radiator mounting port corresponding to the position of the heat exchange cavity. The heat dissipation module is installed in the radiator mounting port.

5. The closed-loop optical engine with dual-fan circulating heat dissipation according to claim 1, characterized in that: It also includes a light source module, which includes an LED light source and a light funnel. The light funnel is located on the side of the first lens away from the LCD screen, with the light outlet of the light funnel facing the LCD screen and the light inlet of the light funnel containing the LED light source.

6. The closed-loop optical engine with dual-fan circulating heat dissipation according to claim 5, characterized in that: It also includes an LED heat sink, which is used to dissipate heat from the LED light source. The air outlet of the external circulation fan faces the LED heat sink, and the air inlet of the external circulation fan faces the hot end heat sink.

7. The closed-loop optical engine with dual-fan circulating heat dissipation according to claim 6, characterized in that: The optical engine housing also includes an optical funnel shell, which is fitted over the LED light source, the optical funnel, the LED heat sink, and the outside of the optical funnel.

8. The closed-loop optical engine with dual-fan circulating heat dissipation according to claim 7, characterized in that: The light funnel casing also forms an external circulation air duct, in which the external circulation fan and LED heat sink are both located.

9. The closed-loop optical engine with dual-fan circulating heat dissipation according to any one of claims 1-8, characterized in that: The first internal circulation fan, the second internal circulation fan, and the external circulation fan are all vortex fans.

10. An LCD projector, characterized in that, Includes an outer casing and a closed optical engine with dual-fan circulating heat dissipation as described in any one of claims 1-9, installed within the outer casing.

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