Multi-wind-path high-efficiency heat dissipation closed optical machine and projector

Abstract

The utility model relates to a multi-wind-path high-efficiency heat dissipation closed light machine and a projector. The closed light machine comprises a light machine housing, an internal circulation fan unit, a heat dissipation module and an external circulation fan unit. The first heat dissipation air channel is located on the first side of the LCD screen, and the second heat dissipation air channel is located on the second side of the LCD screen. The first end of the first heat dissipation air channel, the second heat exchange cavity, the middle heat exchange cavity, the first heat exchange cavity and the second end of the first heat dissipation air channel are sequentially communicated to form a horizontal circulation heat dissipation channel. The first end of the second heat dissipation air channel, the middle heat exchange cavity, the first ventilation opening, the second containing cavity, the second ventilation opening and the second end of the second heat dissipation air channel are sequentially communicated to form a vertical circulation heat dissipation channel. Through the position design of the heat dissipation channel, the fans and the radiator, heat dissipation of the closed ray machine is completed through mutual cooperation, the heat dissipation efficiency of the projector is improved, the overall power consumption and the size of the projector are reduced, and it can be ensured that the projector can operate safely and stably.

Description

Technical Field

[0001] The utility model relates to the technical field of LCD projectors, in particular to a closed optical machine with multiple wind 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 can effectively prevent dust and pollutants from entering the optical path, thereby significantly reducing the impact of dust on the LCD screen, allowing projection equipment to be more widely used in various occasions, and also greatly extending the service life of projection equipment. However, the closed environment brings great difficulties to the heat dissipation of the optical components inside the optical engine. How to efficiently remove the internal heat without destroying the closed space is the focus of the current optical engine heat dissipation.

[0004] Sealed optical machines usually use internal and external circulation methods to discharge heat. For high-power sealed optical machines, the existing heat dissipation solutions mainly use semiconductor refrigeration sheets to remove the internal heat of the optical machine, 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, seriously affecting the heat dissipation efficiency of the entire machine; on the other hand, the current water-cooled heat dissipation-related production processes are not yet mature, the cost of use is high, and there is 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, but the larger the fan power, the louder the noise, affecting the user experience. A single larger radiator will take up more space, and the internal structure of the projector cannot be reasonably designed. Utility Model Content

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

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model 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 and an external circulation fan unit;

[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 surround a first accommodating cavity, the bottom shell and the middle shell together surround 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 comprises a first lens, an LCD screen, and a second lens sequentially arranged along a light emitting direction, wherein the partition, the first lens, the LCD screen, and the second lens jointly divide the first accommodation 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 channel, 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 channel;

[0011] The internal circulation fan unit comprises a first internal circulation fan and a second internal circulation fan, wherein 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 comprises a first heat sink and a second heat sink, the cold end of the first heat sink is arranged in the first heat exchange cavity, the cold end of the second heat sink is arranged in the second heat exchange cavity, the hot ends of the first heat sink and the second heat sink are both arranged outside the optical machine housing, and the heat dissipation top housing has a plurality of spaced cold end fins arranged on one side facing the middle heat exchange cavity, and has a plurality of spaced hot end fins arranged on the side away from the middle 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] 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 a large area of ​​fins that can act as a radiator to improve the 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 whole 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, and can take 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 used in various projectors using closed optical machines.

[0015] As an optional or preferred implementation, 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.

[0016] 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, 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, the shell ventilation gap and the second ventilation gap both extend along a second direction, and the first direction intersects with the second direction.

[0017] 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.

[0018] 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.

[0019] As an optional or preferred implementation, 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.

[0020] As an optional or preferred implementation, the enclosed optical 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.

[0021] As an optional or preferred implementation, 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.

[0022] As an optional or preferred implementation, 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.

[0023] A projector comprises an outer shell and a closed optical machine with multiple wind paths and efficient heat dissipation as described above installed in the outer shell, wherein ventilation holes are arranged at multiple locations of the outer shell.

[0024] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a sealed optical machine in an embodiment of the present application;

[0026] Figure 2 An exploded schematic diagram of a sealed optical machine in an embodiment of the present application;

[0027] Figure 3 for Figure 1 Schematic diagram of the structure when the heat dissipation top shell and some partitions are removed;

[0028] Figure 4 This is a schematic diagram of the exploded structure of the optical machine housing in the embodiment of the present application;

[0029] Figure 5 A schematic diagram of the internal structure of a part of a sealed optical machine in an embodiment of the present application;

[0030] Figure 6 It is a schematic diagram of air circulation in the horizontal circulation heat dissipation channel;

[0031] Figure 7 A schematic diagram of the internal structure of a part of a sealed optical machine in an embodiment of the present application;

[0032] Figure 8 It is a schematic diagram of air circulation in the vertical circulation heat dissipation channel;

[0033] Fig. 9 This is a schematic diagram of the external structure of the sealed optical engine in the embodiment of the present application;

[0034] Fig.10 This is a schematic diagram of the structure of the projector in the embodiment of the present application;

[0035] Description of reference numerals:

[0036] 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 air duct; 142. Second heat dissipation air duct; 143. Middle heat exchange cavity; 144. First heat exchange cavity; 145. Second heat exchange cavity; 15. Second accommodating cavity; 16. Partition; 17. Fan installation position; 18. First accommodating cavity; 21. First lens; 22. Heat insulation 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 shell; 631. Installation cavity; 64. LED radiator; 71. Reflector; 72. Projection lens; 8. Outer shell; 81. Ventilation hole. DETAILED DESCRIPTION

[0037] To further illustrate each embodiment, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which 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 contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention.

[0038] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] See also Figures 1 to 9 The present 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.

[0040] like Figure 1-4 As shown in Figure 6, the optical machine housing includes a heat dissipation top shell 11, a middle shell 12 and a bottom shell 13 connected in sequence from top to bottom. The heat dissipation top shell 11 and the middle shell 12 together enclose a first accommodation cavity 18, and the bottom shell 13 and the middle shell 12 together enclose a second accommodation cavity 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 accommodation cavity 18. The heat dissipation top shell 11 is a plate-like structure, and the middle shell 12 and the bottom shell 13 are both basin-like structures open upward. The heat dissipation top shell 11 covers the opening of the middle shell 12 to enclose the first accommodation cavity 18 together with the middle shell 12, and the opening of the bottom shell 13 is connected to the bottom of the middle shell 12 to enclose the second accommodation cavity 15 together. The heat dissipation top shell 11 has a heat dissipation function. The heat dissipation top shell 11 has a plurality of spaced cold end fins 111 on the side facing the middle shell 12, and has a plurality of spaced hot end fins 112 on the side away from the middle shell 12. This arrangement enables the optical machine housing to have a heat dissipation function without adding additional components, thereby greatly improving the heat dissipation efficiency.

[0041] 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, wherein the first lens 21 is a rear Fresnel lens, and the second lens 24 is a front Fresnel lens, and the partition 16 may include a partition and an LCD mounting bracket and other structures, as long as they can achieve the effect of separation. The partition 16, the first lens 21, the LCD screen 23, and the second lens 24 jointly divide the first accommodating chamber 18 into a first heat dissipation duct 141, a second heat dissipation duct 142, a middle heat exchange chamber 143, a first heat exchange chamber 144, and a second heat exchange chamber 145, wherein the LCD screen 23 has a first side and a second side opposite to each other, 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 a first end and a second end opposite to each other.

[0042] 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 middle 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, thereby making 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 also be opposite to those 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 setting only needs to adjust the specific separation position of the partition 16 to achieve, and will not affect the overall heat dissipation efficiency.

[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 arranged in the first heat exchange cavity 144 to drive the air circulation flow of the horizontal circulation heat dissipation channel. The second internal circulation fan 32 is arranged in the second accommodating cavity 15 to drive the air circulation flow of the vertical circulation heat dissipation channel. It can be seen that, through the above arrangement, the first heat dissipation duct 141 and the second heat dissipation duct 142 can be formed on the opposite sides of the LCD screen 23 to dissipate the heat of 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 middle heat exchange cavity 143, so the two airflows will disturb each other in the middle heat exchange cavity 143 and exchange heat and mass, which 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.

[0044] The heat dissipation module includes a first heat sink 41 and a second heat sink 42, wherein the cold end 412 of the first heat sink 41 is arranged in the first heat exchange cavity 144, the cold end 422 of the second heat sink 42 is arranged in the second heat exchange cavity 145, and the hot ends of the first heat sink 41 and the second heat sink 42 are both arranged outside the optical machine housing. It can be seen that the first heat sink 41 and the second heat sink 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 of the shell arranged at intervals on the side facing the middle heat exchange cavity 143, and the above-mentioned multiple spaced hot end fins 112 of the shell arranged at intervals on the side away from the middle heat exchange cavity 143. It can be seen that the heat dissipation top shell 11 can provide a cold source for the middle heat exchange cavity 143, and participate in the heat exchange between the horizontal circulation heat dissipation channel and the vertical circulation heat dissipation channel.

[0045] 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.

[0046] 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 of 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 to firstly export the heat using the cold end 422 of the second radiator 42, then flows through the middle heat exchange cavity 143 and then flows into the first heat exchange cavity 144 to continue to export the heat using the cold end 412 of the first radiator 41, 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 arrow in the figure is the air circulation trajectory of the vertical circulation heat dissipation channel. The second internal circulation fan 32 drives the air circulation flow of the vertical circulation heat dissipation channel, so that the air takes away the heat of the LCD screen 23 and the second lens 24 from the second heat dissipation air duct 142, then flows through the middle heat exchange cavity 143 and uses the cold end fins 111 of the shell to export 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 middle heat exchange cavity 143, so the two airflows will disturb each other in the middle heat exchange cavity 143 and exchange heat and mass, which 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. 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 relatively low temperature, which is beneficial to improving the heat dissipation efficiency.

[0047] 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 a large area of ​​fins that can act as a radiator to improve the 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 whole 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, and can take 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 used in various projectors using closed optical machines.

[0048] Please also refer to Fig. 9, a plurality of the shell hot end fins 112 are arranged at intervals in the horizontal direction to form a shell ventilation gap, the hot end of the first radiator 41 includes a plurality of first hot end fins 411 arranged at intervals in the vertical direction to form a first ventilation gap, the hot end of the second radiator 42 includes a plurality of second hot end fins 421 arranged at intervals in the vertical direction to form a second ventilation gap, the first ventilation gap extends along a first direction, the shell ventilation gap and the second ventilation gap both extend along a 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, it is possible to ensure that the external circulation air path is unobstructed and the external circulation air paths are not easily interfered with, that is, it is ensured that the hot end of the first radiator 41 is stably cooled by the first external circulation fan 51, the hot end of the second radiator 42 is stably cooled by the second external circulation fan 52, and the shell hot-end fins 112 are stably cooled by the third external circulation fan 53. In the present embodiment, the first direction is the left-right direction of the optical machine, and the second direction is the front-back direction of the optical machine.

[0049] 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.

[0050] 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.

[0051] Preferably, the enclosed optical machine of this embodiment further includes a light source module, the light source module includes an LED light source 61, a light funnel 62 and a light funnel shell 63, an opening is provided on the side wall of the middle shell 12 corresponding to the LCD screen 23, the light funnel shell 63 is installed at the opening, the light funnel 62 is arranged in the light funnel shell 63, the light outlet of the light funnel 62 faces the LCD screen 23, and the light inlet of the light funnel 62 is arranged at the LED light source 61. The imaging module further includes a heat-insulating glass 22 arranged between the first lens 21 and the LCD screen 23, and the enclosed optical machine further includes a projection module, the projection module includes a reflector 71 and a projection lens 72, and the reflector 71 is arranged in the middle heat exchange cavity 143 to reflect the light emitted by the second lens 24 to 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.

[0052] Preferably, the enclosed optical machine of this embodiment further includes an LED radiator 64, which is used to dissipate heat for the LED light source 61, so as to effectively ensure the normal operation of the LED light source 61 and extend the service life of the LED light source 61. The light funnel housing 63 is formed with an installation cavity 631, and the second external circulation fan 52, the third external circulation fan 53 and the LED radiator 64 are all arranged in the installation cavity 631, and the second external circulation fan 52 and the third external circulation fan 53 are also used to dissipate heat for the LED radiator 64. Thus, the utilization rate of the second external circulation fan 52 and the third external circulation fan 53 can be improved, and their performance can be fully utilized. At least a part of the hot end of the second radiator 42 is surrounded by the installation cavity 631, and the hot end of the second radiator 42 and the LED radiator 64 are respectively located on opposite sides of the second external circulation fan 52. Thus, when the second external circulation fan 52 is working, air can be driven to flow through the hot end of the second radiator 42 and the LED radiator 64, and both are cooled at the same time.

[0053] 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 flow fans. Different types of fans are arranged in different ways. Such an arrangement is conducive to making the overall structural design more reasonable.

[0054] Please also see Fig.10 This embodiment also provides a projector, which includes an outer shell 8 and the above-mentioned multi-wind path high-efficiency heat dissipation sealed optical engine installed in the outer shell 8, and the outer shell 8 is provided with ventilation holes 81 at multiple locations. The projector using the sealed optical engine of the embodiment of the utility model is conducive to miniaturization design, and has good heat dissipation effect and high sealing performance.

[0055] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model manual self-centering vise. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A closed optical machine with multiple air paths and efficient heat dissipation, characterized in that: include: Optical machine housing, internal circulation fan unit, heat dissipation module and external circulation fan unit; 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 surround a first accommodating cavity, the bottom shell and the middle shell together surround 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 comprises a first lens, an LCD screen, and a second lens sequentially arranged along a light emitting direction, wherein the partition, the first lens, the LCD screen, and the second lens jointly divide the first accommodation 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 channel, 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 channel; The internal circulation fan unit comprises a first internal circulation fan and a second internal circulation fan, wherein 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 comprises a first heat sink and a second heat sink, the cold end of the first heat sink is arranged in the first heat exchange cavity, the cold end of the second heat sink is arranged in the second heat exchange cavity, the hot ends of the first heat sink and the second heat sink are both arranged outside the optical machine housing, and the heat dissipation top housing has a plurality of spaced cold end fins arranged on one side facing the middle heat exchange cavity, and has a plurality of spaced hot end fins arranged on the side away from the middle heat exchange cavity; 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.

2. The sealed optical machine 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 a side of the second lens facing away from the LCD screen.

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

6. The sealed optical machine with multiple air paths and efficient 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 shell. An opening is opened 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 machine with multiple air paths and efficient 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 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.

8. The sealed optical machine 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 two 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: It comprises an outer shell and a closed optical machine with multiple wind paths and efficient 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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