A sealed optical machine and projector with multiple air paths and efficient heat dissipation

Abstract

The present invention relates to a closed optical machine and projector with multiple air paths and efficient heat dissipation, the closed optical machine comprising: an optical machine housing, an internal circulation fan group, a heat dissipation module, an external circulation fan group and a projection module; 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 first end of the first heat dissipation duct, the second heat exchange chamber, the middle heat exchange chamber, the first heat exchange chamber and the second end of the first heat dissipation duct are connected in sequence to form a horizontal circulation heat dissipation channel, and the first end of the second heat dissipation duct, the middle heat exchange chamber, the first ventilation port, the second accommodating chamber, the second ventilation port and the second end of the second heat dissipation duct are connected in sequence to form a vertical circulation heat dissipation channel; the present application completes the heat dissipation of the closed optical machine through the design of the positions of the heat dissipation channels, each fan and the radiator, and cooperates with each other, which not only improves the heat dissipation efficiency of the projector, reduces the overall power consumption and volume of the projector, but also ensures that the projector can operate safely and stably.

Description

Technical Field

[0001] The present invention relates to the technical field of LCD projectors, and in particular to a sealed optical machine with multiple air paths and high-efficiency heat dissipation, and a projector. Background Art

[0002] The LCD light engine (i.e., projection light engine) is the most important component in an LCD projector. During the operation of the LCD light engine, the LCD screen will absorb a large amount of heat, so the LCD screen needs to be forced to cool and dissipate heat. LCD light engines are mainly divided into two types according to the heat dissipation type, namely closed light engines and open light engines.

[0003] Sealed optical engines effectively prevent dust and contaminants from entering the optical path, significantly reducing the impact of dust on LCD screens. This allows projection equipment to be more adaptable to a wider range of applications and significantly extends its lifespan. However, this enclosed environment poses significant challenges to dissipating heat from the optical components within the optical engine. Efficiently dissipating internal heat without disrupting the enclosed space is currently a key focus of optical engine cooling.

[0004] Sealed optical engines usually use internal and external circulation methods to dissipate heat. For high-power sealed optical engines, the existing heat dissipation solutions mainly use semiconductor refrigeration sheets to remove the heat inside the optical engine, or directly use water cooling systems for heat dissipation. However, semiconductor refrigeration sheets will not only increase the power consumption of the projector, but also generate a large amount of additional heat, which will add a considerable burden to the projector's external circulation heat dissipation system and seriously affect the heat dissipation efficiency of the entire machine. On the other hand, the current water-cooling related production processes are not yet mature, the cost of use is high, and there is also a risk of leakage. If the above two heat dissipation solutions are not adopted, in order to ensure cooling efficiency, the fan power and radiator volume need to be set larger. However, the higher the fan power, the louder the noise, affecting the user experience. A single large radiator will take up more space, making it impossible to reasonably design the internal structure of the projector. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide a sealed optical machine and projector with multiple air paths and efficient heat dissipation.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A closed optical machine with multiple air paths and efficient heat dissipation, comprising: an optical machine housing, an internal circulation fan unit, a heat dissipation module, an external circulation fan unit, and a projection module;

[0008] The optical machine housing includes a heat dissipation top shell, a middle shell, and a bottom shell connected in sequence from top to bottom. The heat dissipation 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 vent and a second vent. 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 in sequence along a light-emitting direction; the partition, the first lens, the LCD screen, and the second lens collectively divide the first accommodating cavity into a first heat dissipation duct, a second heat dissipation duct, a middle heat exchange cavity, a first heat exchange cavity, and a second heat exchange cavity; wherein 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 first end of the first heat dissipation duct, the second heat exchange cavity, the middle heat exchange cavity, the first heat exchange cavity, and the second end of the first heat dissipation duct are sequentially connected to form a horizontal circulation heat dissipation duct, and the first end of the second heat dissipation duct, the middle heat exchange cavity, the first vent, the second accommodating cavity, the second vent, and the second end of the second heat dissipation duct are sequentially connected to form a vertical circulation heat dissipation duct;

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

[0012] The heat dissipation module includes a first heat sink and a second heat sink, wherein the cold end of the first heat sink is disposed in the first heat exchange cavity, and the cold end of the second heat sink is disposed in the second heat exchange cavity. The hot ends of the first heat sink and the second heat sink are both disposed outside the optical machine housing. The heat dissipation top housing has a plurality of spaced cold end fins on a side facing the central heat exchange cavity, and has a plurality of spaced hot end fins on a side facing away from the central heat exchange cavity.

[0013] The external circulation fan unit is arranged outside the optical machine housing, and the external circulation fan unit includes a first external circulation fan, a second external circulation fan and a third external circulation fan. The first external circulation fan is used to dissipate heat to the hot end of the first radiator, the second external circulation fan is used to dissipate heat to the hot end of the second radiator, and the third external circulation fan is used to dissipate heat to the hot end fins of the housing.

[0014] The projection module includes a reflector and a projection lens. The reflector is arranged in the central heat exchange cavity to reflect the light emitted by the second lens to the projection lens.

[0015] As can be seen from the above, the present application utilizes a heat dissipation top shell to replace the plastic top shell of the existing optical machine housing. The heat dissipation top shell has large-area fins that can act as a radiator to improve heat dissipation efficiency. While abandoning the existing semiconductor refrigeration plate heat dissipation solution, it also avoids the heat dissipation components from occupying too much space. The heat of the radiator is brought to the outside of the optical machine housing through the internal circulation fan unit, and then the external structure is cleverly designed to use the external circulation fan unit to take away the heat to complete the heat dissipation of the entire machine. The purpose of the present application is to be able to complete the heat dissipation of the closed optical machine by designing the heat dissipation channel, the position of each fan and the radiator, and cooperating with each other without using semiconductor refrigeration plates and liquid cooling. This not only improves the heat dissipation efficiency of the projector, reduces the overall power consumption and volume of the projector, and ensures that the projector can operate safely and stably, but also takes into account the airtightness of the optical machine, the high efficiency of heat dissipation, the compactness of the structure, and the safety and stability. The closed optical machine of the present application can be widely applicable to various projectors using closed optical machines.

[0016] As an optional or preferred 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 heat exchange cavity is located on the side of the second lens facing away from the LCD screen.

[0017] As an optional or preferred embodiment, a plurality of the shell hot end fins are arranged at intervals in the horizontal direction to form a shell ventilation gap, the hot end of the first radiator includes a plurality of first hot end fins arranged at intervals in the vertical direction to form a first ventilation gap, and the hot end of the second radiator includes a plurality of second hot end fins arranged at intervals in the vertical direction to form a second ventilation gap, the first ventilation gap extends along a first direction, and the shell ventilation gap and the second ventilation gap both extend along a second direction, and the first direction intersects with the second direction.

[0018] As an optional or preferred implementation, the second external circulation fan and the third external circulation fan are symmetrically arranged on opposite sides of the second direction.

[0019] As an optional or preferred implementation, a fan installation position for installing the first external circulation fan is provided on the outer side of the optical machine housing.

[0020] As an optional or preferred embodiment, the enclosed optical machine also includes a light source module, which includes an LED light source, a light funnel and a light funnel shell. An opening is provided on the middle shell corresponding to the side wall of the LCD screen. The light funnel shell is installed at the opening. The light funnel is arranged in the light funnel shell. The light outlet of the light funnel faces the LCD screen, and the light inlet of the light funnel is arranged at the LED light source.

[0021] As an optional or preferred embodiment, the enclosed light machine also includes an LED radiator, which is used to dissipate heat for the LED light source. The light funnel shell forms an installation cavity, and the second external circulation fan, the third external circulation fan and the LED radiator are all arranged in the installation cavity. The second external circulation fan and the third external circulation fan are also used to dissipate heat for the LED radiator.

[0022] As an optional or preferred embodiment, at least a portion of the hot end of the second heat sink is surrounded by the mounting cavity, and the hot end of the second heat sink and the LED heat sink are respectively located on opposite sides of the second external circulation fan.

[0023] As an optional or preferred embodiment, the first internal circulation fan, the second internal circulation fan, and the first external circulation fan are all vortex fans, and the second external circulation fan and the third external circulation fan are all axial fans.

[0024] A projector comprises an outer shell and a sealed optical engine with multiple air paths and high-efficiency heat dissipation as described above, which is installed in the outer shell. Ventilation holes are provided at multiple locations of the outer shell.

[0025] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a sealed optical engine in an embodiment of the present application;

[0027] Figure 2 This is an exploded schematic diagram of a sealed optical engine in an embodiment of the present application;

[0028] Figure 3 for Figure 1 Schematic diagram of the structure when the heat dissipation top shell and some partitions are removed;

[0029] Figure 4 This is a schematic diagram of the exploded structure of the optical machine housing in an embodiment of the present application;

[0030] Figure 5 A schematic diagram of the internal structure of a portion of a sealed optical engine in an embodiment of the present application;

[0031] Figure 6 This is a schematic diagram of the air circulation of the horizontal circulation heat dissipation channel;

[0032] Figure 7 A schematic diagram of the internal structure of a portion of a sealed optical engine in an embodiment of the present application;

[0033] Figure 8 Schematic diagram of air circulation in vertical circulation heat dissipation channel;

[0034] Figure 9 This is a schematic diagram of the external structure of the sealed optical engine in an embodiment of the present application;

[0035] Figure 10 This is a schematic diagram of the structure of the projector in the embodiment of the present application;

[0036] Description of reference numerals:

[0037] 11. Heat dissipation top shell; 111. Shell cold end fins; 112. Shell hot end fins; 12. Middle shell; 121. First vent; 122. Second vent; 13. Bottom shell; 141. First heat dissipation duct; 142. Second heat dissipation duct; 143. Middle heat exchange chamber; 144. First heat exchange chamber; 145. Second heat exchange chamber; 15. Second accommodation chamber; 16. Partition; 17. Fan mounting position; 18. First accommodation chamber; 21. First lens; 22. Insulating glass; 23. LCD screen; 2 4. Second lens; 31. First internal circulation fan; 32. Second internal circulation fan; 41. First radiator; 411. First hot-end fin; 42. Second radiator; 421. Second hot-end fin; 51. First external circulation fan; 52. Second external circulation fan; 53. Third external circulation fan; 61. LED light source; 62. Light funnel; 63. Light funnel housing; 631. Mounting cavity; 64. LED radiator; 71. Reflector; 72. Projection lens; 8. Outer housing; 81. Ventilation hole. DETAILED DESCRIPTION

[0038] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0040] See also Figures 1 to 9 This embodiment provides a closed optical machine with multiple air paths and efficient heat dissipation, which includes an optical machine housing, an internal circulation fan unit, a heat dissipation module and an external circulation fan unit.

[0041] like Figure 1-4 As shown in Figures 6 and 7, the optical machine housing includes a heat dissipation top shell 11, a middle shell 12, and a bottom shell 13, which are connected in sequence from top to bottom. The heat dissipation top shell 11 and the middle shell 12 together enclose a first accommodating chamber 18, and the bottom shell 13 and the middle shell 12 together enclose a second accommodating chamber 15. The bottom of the middle shell 12 is provided with a first vent 121 and a second vent 122. A partition 16 and an imaging module are provided in the first accommodating chamber 18. The heat dissipation top shell 11 is a plate-like structure, and the middle shell 12 and the bottom shell 13 are both upwardly open basin-shaped structures. The heat dissipation top shell 11 covers the opening of the middle shell 12 to enclose the first accommodating chamber 18 together with the middle shell 12. The opening of the bottom shell 13 abuts the bottom of the middle shell 12 to enclose the second accommodating chamber 15. The heat dissipation top shell 11 has a heat dissipation function. The side of the heat dissipation top shell 11 facing the middle shell 12 has a plurality of spaced-apart shell cold-end fins 111, and the side away from the middle shell 12 has a plurality of spaced-apart shell hot-end fins 112. This arrangement can make the optical machine housing have a heat dissipation function without adding additional components, thereby greatly improving the heat dissipation efficiency.

[0042] like Figure 3-4 As shown, the imaging module includes a first lens 21, an LCD screen 23, and a second lens 24 arranged in sequence along the light-emitting direction. The first lens 21 is a rear Fresnel lens, and the second lens 24 is a front Fresnel lens. The partition 16 may include a partition plate, an LCD mounting bracket, or other structures, as long as they can achieve the desired separation effect. The partition 16, the first lens 21, the LCD screen 23, and the second lens 24 collectively divide the first accommodating chamber 18 into a first heat dissipation duct 141, a second heat dissipation duct 142, a central heat exchange chamber 143, a first heat exchange chamber 144, and a second heat exchange chamber 145. The LCD screen 23 has opposing first and second sides. The first heat dissipation duct 141 is located on the first side of the LCD screen 23, and the second heat dissipation duct 142 is located on the second side of the LCD screen 23. The first heat dissipation duct 141 and the second heat dissipation duct 142 each have opposing first and second ends.

[0043] Among them, the first end of the first heat dissipation duct 141, the second heat exchange cavity 145, the middle heat exchange cavity 143, the first heat exchange cavity 144 and the second end of the first heat dissipation duct 141 are connected in sequence to form a horizontal circulation heat dissipation channel, and the first end of the second heat dissipation duct 142, the middle heat exchange cavity 143, the first ventilation port 121, the second accommodating cavity 15, the second ventilation port 122 and the second end of the second heat dissipation duct 142 are connected in sequence to form a vertical circulation 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 central heat exchange chamber 143 is located on the side of the second lens 24 facing away from the LCD screen 23. That is, the first side of the LCD screen 23 is the side facing the first lens 21, and the second side of the LCD screen 23 is the side facing the second lens 24. The first end of the first heat dissipation duct 141 is the right end, and the second end is the left end. The first end of the second heat dissipation duct 142 is the top end, and the second end is the bottom end. This makes the overall layout more reasonable and the heat dissipation efficiency higher. Of course, in other embodiments, the positions of the first heat dissipation duct 141 and the second heat dissipation duct 142 can be opposite to that of 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 configuration can be achieved by simply adjusting the specific separation position of the partition 16 and does not affect the overall heat dissipation efficiency.

[0044] 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 arranged in the first heat exchange chamber 144 to drive the air circulation flow in the horizontal circulation heat dissipation channel. The second internal circulation fan 32 is arranged in the second accommodating chamber 15 to drive the air circulation flow in the vertical circulation heat dissipation channel. It can be seen that through the above arrangement, a first heat dissipation duct 141 and a second heat dissipation duct 142 can be formed on opposite sides of the LCD screen 23 to dissipate heat for the LCD screen 23, and the first heat dissipation duct 141 and the second heat dissipation duct 142 respectively participate in forming the horizontal circulation heat dissipation channel and the vertical circulation heat dissipation channel to ensure sufficient heat dissipation efficiency. The horizontal circulation heat dissipation channel and the vertical circulation heat dissipation channel both share the central heat exchange chamber 143, so the two airflows will disturb each other in the central heat exchange chamber 143 and exchange heat and mass. This can prevent the temperature difference between the horizontal and vertical circulation flow fields from being too large, thereby avoiding excessive differences in the heat dissipation efficiency of the components.

[0045] The heat dissipation module includes a first radiator 41 and a second radiator 42. The cold end 412 of the first radiator 41 is arranged in the first heat exchange cavity 144, and the cold end 422 of the second radiator 42 is arranged in the second heat exchange cavity 145. The hot ends of the first radiator 41 and the second radiator 42 are both arranged outside the optical machine housing. It can be seen that the first radiator 41 and the second radiator 42 can provide a cold source for the horizontal circulation heat dissipation channel to improve the heat dissipation efficiency. Specifically, the heat dissipation top shell 11 is provided with the above-mentioned multiple spaced cold end fins 111 on the side facing the central heat exchange cavity 143, and the above-mentioned multiple spaced hot end fins 112 are provided on the side away from the central heat exchange cavity 143. It can be seen that the heat dissipation top shell 11 can provide a cold source for the central heat exchange cavity 143 and participate in the heat exchange between the horizontal circulation heat dissipation channel and the vertical circulation heat dissipation channel.

[0046] The external circulation fan unit is arranged outside the optical machine housing, and the external circulation fan unit includes a first external circulation fan 51, a second external circulation fan 52 and a third external circulation fan 53. The first external circulation fan 51 is used to dissipate heat from the hot end of the first radiator 41, the second external circulation fan 52 is used to dissipate heat from the hot end of the second radiator 42, and the third external circulation fan 53 is used to dissipate heat from the hot end fins 112 of the housing.

[0047] It is understandable that when the sealed optical machine is working, on the one hand, Figure 5 and 6 As shown, Figure 6 The black arrow in the figure is the air circulation trajectory of the horizontal circulation heat dissipation channel. The first internal circulation fan 31 drives the air circulation flow in the horizontal circulation heat dissipation channel, so that the air takes away the heat of the LCD screen 23 and the first lens 21 from the first heat dissipation duct 141, then flows through the second heat exchange cavity 145 and uses the cold end 422 of the second radiator 42 to first dissipate the heat, then flows through the middle heat exchange cavity 143 and flows into the first heat exchange cavity 144 and uses the cold end 412 of the first radiator 41 to continue to dissipate the heat, and finally flows back to the air inlet of the first internal circulation fan 31; on the other hand, as shown in FIG. Figure 7 and 8 As shown, Figure 8The black arrows in the figure represent the air circulation trajectory of the vertical circulation heat dissipation channel. The second internal circulation fan 32 drives the air circulation flow in the vertical circulation heat dissipation channel, so that the air removes heat from the LCD screen 23 and the second lens 24 through the second heat dissipation duct 142, then flows through the central heat exchange cavity 143 and uses the cold end fins 111 of the shell to dissipate the heat, and then flows back to the second accommodating cavity 15 through the first vent 121 and enters the air inlet of the second internal circulation fan 32. It should be noted that the horizontal circulation heat dissipation channel and the vertical circulation heat dissipation channel both share the central heat exchange cavity 143. Therefore, the two airflows will disturb each other in the central heat exchange cavity 143 and exchange heat and mass. This can prevent excessive temperature differences between the horizontal and vertical circulation flow fields, thereby avoiding excessive differences in component heat dissipation efficiency. In addition, the external circulation fan unit dissipates heat to the hot end of the first radiator 41, the hot end of the second radiator 42 and the hot end fins 112 of the shell outside the optical machine shell, so that the cold end 412 of the first radiator 41, the cold end 422 of the second radiator 42 and the cold end fins 111 of the shell can be kept at a lower temperature, which is beneficial to improving the heat dissipation efficiency.

[0048] As can be seen from the above, the present application utilizes a heat dissipation top shell 11 to replace the plastic top shell of the existing optical machine housing. The heat dissipation top shell 11 has large-area fins that can act as a radiator to improve heat dissipation efficiency. While abandoning the existing semiconductor refrigeration plate heat dissipation solution, it also avoids the heat dissipation components from occupying too much space. The heat of the radiator is brought to the outside of the optical machine housing through the internal circulation fan unit, and then the external structure is cleverly designed to use the external circulation fan unit to take away the heat to complete the heat dissipation of the entire machine. The purpose of the present application is to be able to complete the heat dissipation of the closed optical machine by designing the heat dissipation channel, the position of each fan and the radiator, and cooperating with each other without using semiconductor refrigeration plates and liquid cooling. This not only improves the heat dissipation efficiency of the projector, reduces the overall power consumption and volume of the projector, and ensures that the projector can operate safely and stably, but also takes into account the airtightness of the optical machine, the high efficiency of heat dissipation, the compactness of the structure, and the safety and stability. The closed optical machine of the present application can be widely applicable to various projectors using closed optical machines.

[0049] Please also refer to Figure 9, multiple shell hot end fins 112 are arranged at intervals along the horizontal direction to form a shell ventilation gap, the hot end of the first radiator 41 includes multiple first hot end fins 411 arranged at intervals along the vertical direction to form a first ventilation gap, and the hot end of the second radiator 42 includes multiple second hot end fins 421 arranged at intervals along the vertical direction to form a second ventilation gap, the first ventilation gap extends along the first direction, and the shell ventilation gap and the second ventilation gap both extend along the second direction, and the first direction intersects with the second direction. By such an arrangement, since the arrangements of the shell hot-end fins 112, the first hot-end fins 411 and the second hot-end fins 421 are different from each other, the external circulation air path can be guaranteed to be unobstructed, and the various external circulation air paths are not easily interfered with, that is, it is guaranteed that the hot end of the first radiator 41 is stably dissipated by the first external circulation fan 51, the hot end of the second radiator 42 is stably dissipated by the second external circulation fan 52, and the shell hot-end fins 112 are stably dissipated by the third external circulation fan 53. In this embodiment, the first direction is the left and right direction of the optical machine, and the second direction is the front and back direction of the optical machine.

[0050] Preferably, in this embodiment, the second external circulation fan 52 and the third external circulation fan 53 are symmetrically arranged on opposite sides of the second direction to improve the symmetry of the overall structure and improve space utilization.

[0051] Preferably, a fan installation position 17 for installing the first external circulation fan 51 is provided on the outer side of the optical machine housing in this embodiment, so as to facilitate the installation of the first external circulation fan 51. The fan installation position 17 is a groove-shaped structure.

[0052] Preferably, the enclosed optical engine of this embodiment further includes a light source module, comprising an LED light source 61, a light funnel 62, and a light funnel housing 63. An opening is provided on the side wall of the middle shell 12 corresponding to the LCD screen 23, and the light funnel housing 63 is mounted at the opening. The light funnel 62 is disposed within the light funnel housing 63, with the light outlet of the light funnel 62 facing the LCD screen 23, and the light inlet of the light funnel 62 disposed at the LED light source 61. The imaging module further includes an insulating glass 22 disposed between the first lens 21 and the LCD screen 23. The enclosed optical engine further includes a projection module, comprising a reflector 71 and a projection lens 72. The reflector 71 is disposed within the central heat exchange cavity 143 to reflect light emitted from the second lens 24 toward the projection lens 72. The light emitted by the LED light source 61 passes through the light funnel 62, the first lens 21, the heat-insulating glass 22, the LCD screen 23, the second lens 24 and the reflector 71 in sequence, and then is emitted from the projection lens 72 to form a projection image.

[0053] Preferably, the enclosed light engine of this embodiment further includes an LED heat sink 64, which is used to dissipate heat from the LED light source 61, effectively ensuring the proper operation of the LED light source 61 and extending its service life. The light funnel housing 63 defines a mounting cavity 631, within which the second external circulation fan 52, the third external circulation fan 53, and the LED heat sink 64 are disposed. The second and third external circulation fans 52, 53 also dissipate heat from the LED heat sink 64. This improves the utilization of the second and third external circulation fans 52, 53, and maximizes their performance. The hot end of the second heat sink 42 is at least partially surrounded by the mounting cavity 631, with the hot end of the second heat sink 42 and the LED heat sink 64 located on opposite sides of the second external circulation fan 52. Consequently, when the second external circulation fan 52 is in operation, it drives air through the hot end of the second heat sink 42 and the LED heat sink 64, dissipating heat from both.

[0054] In this embodiment, the first internal circulation fan 31, the second internal circulation fan 32, and the first external circulation fan 51 are all vortex fans, and the second external circulation fan 52 and the third external circulation fan 53 are all axial fans. Different types of fans are arranged in different ways. Such an arrangement is conducive to making the overall structural design more reasonable.

[0055] Please also see Figure 10 This embodiment further provides a projector comprising an outer shell 8 and the aforementioned multi-airway, efficient heat dissipation sealed optical engine mounted within the outer shell 8. The outer shell 8 is provided with ventilation holes 81 at multiple locations. A projector utilizing the sealed optical engine of the embodiment of the present invention facilitates a compact design, provides excellent heat dissipation, and exhibits high sealing performance.

[0056] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the manual self-centering vise. It should be noted that a person skilled in the art would be able to devise numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A sealed optical machine with multiple air paths and efficient heat dissipation, characterized in that: include: Optical machine housing, internal circulation fan unit, heat dissipation module, external circulation fan unit and projection module; The optical machine housing includes a heat dissipation top shell, a middle shell, and a bottom shell connected in sequence from top to bottom. The heat dissipation 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 vent and a second vent. 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 in sequence along a light-emitting direction; the partition, the first lens, the LCD screen, and the second lens collectively divide the first accommodating cavity into a first heat dissipation duct, a second heat dissipation duct, a middle heat exchange cavity, a first heat exchange cavity, and a second heat exchange cavity; wherein 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 first end of the first heat dissipation duct, the second heat exchange cavity, the middle heat exchange cavity, the first heat exchange cavity, and the second end of the first heat dissipation duct are sequentially connected to form a horizontal circulation heat dissipation duct, and the first end of the second heat dissipation duct, the middle heat exchange cavity, the first vent, the second accommodating cavity, the second vent, and the second end of the second heat dissipation duct are sequentially connected to form a vertical circulation heat dissipation duct; The internal circulation fan unit includes a first internal circulation fan and a second internal circulation fan, the first internal circulation fan is arranged in the first heat exchange cavity, and the second internal circulation fan is arranged in the second accommodating cavity; The heat dissipation module includes a first heat sink and a second heat sink, wherein the cold end of the first heat sink is disposed in the first heat exchange cavity, and the cold end of the second heat sink is disposed in the second heat exchange cavity. The hot ends of the first heat sink and the second heat sink are both disposed outside the optical machine housing. The heat dissipation top housing has a plurality of spaced cold end fins on a side facing the central heat exchange cavity, and has a plurality of spaced hot end fins on a side facing away from the central heat exchange cavity. The external circulation fan unit is arranged outside the optical machine housing, and includes a first external circulation fan, a second external circulation fan and a third external circulation fan. The first external circulation fan is used to dissipate heat from the hot end of the first radiator, the second external circulation fan is used to dissipate heat from the hot end of the second radiator, and the third external circulation fan is used to dissipate heat from the hot end fins of the housing. The projection module includes a reflector and a projection lens. The reflector is arranged in the central heat exchange cavity to reflect the light emitted by the second lens to the projection lens.

2. The sealed optical engine with multiple air paths and high-efficiency 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 middle heat exchange cavity is located on the side of the second lens facing away from the LCD screen.

3. The sealed optical engine with multiple air paths and high-efficiency heat dissipation according to claim 1, characterized in that: A plurality of the shell hot end fins are arranged at intervals along the horizontal direction to form a shell ventilation gap, the hot end of the first radiator includes a plurality of first hot end fins arranged at intervals along the vertical direction to form a first ventilation gap, and the hot end of the second radiator includes a plurality of second hot end fins arranged at intervals along the vertical direction to form a second ventilation gap, the first ventilation gap extends along a first direction, and the shell ventilation gap and the second ventilation gap both extend along a second direction, and the first direction intersects with the second direction.

4. The sealed optical engine with multiple air paths and high-efficiency heat dissipation according to claim 3, characterized in that: The second external circulation fan and the third external circulation fan are symmetrically arranged on opposite sides of the second direction.

5. The sealed optical engine with multiple air paths and high-efficiency heat dissipation according to claim 1, characterized in that: A fan installation position for installing the first external circulation fan is provided on the outer side of the optical machine housing.

6. The sealed optical engine with multiple air paths and high-efficiency heat dissipation according to claim 1, characterized in that: The device further includes a light source module, which includes an LED light source, a light funnel, and a light funnel shell. An opening is provided on the middle shell corresponding to the side wall of the LCD screen. The light funnel shell is installed at the opening. The light funnel is arranged in the light funnel shell. The light outlet of the light funnel faces the LCD screen, and the light inlet of the light funnel is arranged at the LED light source.

7. The sealed optical engine with multiple air paths and high-efficiency heat dissipation according to claim 6, characterized in that: It also includes an LED radiator, which is used to dissipate heat for the LED light source. The light funnel shell is formed with an installation cavity. The second external circulation fan, the third external circulation fan and the LED radiator are all arranged in the installation cavity. The second external circulation fan and the third external circulation fan are also used to dissipate heat for the LED radiator.

8. The sealed optical engine with multiple air paths and high-efficiency heat dissipation according to claim 7, characterized in that: At least a portion of the hot end of the second heat sink is surrounded by the installation cavity, and the hot end of the second heat sink and the LED heat sink are respectively located on opposite sides of the second external circulation fan.

9. The sealed optical machine with multiple air paths and high-efficiency heat dissipation according to any one of claims 1 to 8, characterized in that: The first internal circulation fan, the second internal circulation fan, and the first external circulation fan are all vortex fans, and the second external circulation fan and the third external circulation fan are all axial flow fans.

10. A projector, characterized in that: The invention comprises an outer shell and a closed optical machine with multiple air paths and high-efficiency heat dissipation as claimed in any one of claims 1 to 9 installed in the outer shell, wherein ventilation holes are provided at multiple locations of the outer shell.

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