Active refrigeration type inner circulation heat dissipation LCD projector and heat dissipation method

Abstract

The application relates to an active refrigeration type inner circulation heat dissipation LCD projector and a heat dissipation method, the projector comprising a shell, a first projection channel arranged vertically and a second projection channel arranged horizontally in the shell, a reflection module, an LCD panel module, a light collecting cover, a light source module and a lens module; an inner circulation heat dissipation channel is arranged in the shell, a semiconductor refrigeration module is arranged on the inner circulation heat dissipation channel, and an inner circulation fan for realizing air circulation is arranged; the inner circulation heat dissipation channel extends from the light inlet end of the first projection channel to the light outlet end of the second projection channel along the length direction of the first projection channel and the second projection channel in sequence, the LCD panel module is arranged on the inner circulation heat dissipation channel, and the inner circulation fan is arranged below the lens module; the semiconductor refrigeration module realizes active inner circulation heat dissipation, avoids dust from entering the projector, efficiently dissipates heat for the LCD panel module, and fully utilizes the position below the lens module to arrange the inner circulation fan.

Description

Technical Field

[0001] This invention relates to the field of projector technology, and in particular to an active cooling internal circulation heat dissipation LCD projector and heat dissipation method. Background Technology

[0002] A projector is a device that can project images or videos onto a screen. It can be connected to external devices such as computers, VCDs, DVDs, BDs, game consoles, and DVs through different interfaces to play the corresponding video signals.

[0003] With the continuous development of modern projector technology, the integration of components within projectors is becoming increasingly higher, and their size is decreasing, leading to their widespread use in homes, offices, schools, and entertainment venues. Projectors require light output devices, such as the projector's optical engine, to provide the light source for projection. Because the optical engine is a high-power device, it operates at high temperatures and generates significant heat, which can easily cause the internal temperature of the projector to become too high. This can damage the electrical components within the projector, shorten its lifespan, and affect its normal operation.

[0004] In existing technologies, projectors disclosed in patents and utility models CN211293574U or CN217060746U often feature fans and open heat dissipation slots on the projector, with a heat sink installed inside. This relies on the heat sink to dissipate heat from the projector's interior with cool external air. However, this open cooling method has low cooling efficiency and slow heat dissipation speed. Furthermore, during the cooling process, external dust often enters the projector through the open heat dissipation slots, causing significant dust accumulation and potential corrosion, thus affecting the projector's usability. In addition, the projector's optical path design is often unreasonable, with fans and heat sinks haphazardly arranged, failing to fully utilize the optical path layout to simplify the overall structure. Therefore, to optimize existing projectors while ensuring efficient heat dissipation and dust prevention, and simultaneously reducing the overall size of the projector, it is necessary to propose an active cooling internal circulation heat dissipation LCD projector and its cooling method. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing an active cooling internal circulation heat dissipation LCD projector and heat dissipation method, which can effectively solve the aforementioned problems.

[0006] To achieve the above requirements, the technical solution adopted by the present invention to solve its technical problem is as follows:

[0007] An active-cooling internal circulation heat dissipation LCD projector is provided. The projector includes a housing, within which a first projection channel and a second projection channel are provided. The first projection channel is vertically arranged, and the second projection channel is horizontally arranged. The projector also includes a reflector module for reflecting light from the first projection channel into the second projection channel, an LCD panel module disposed at the light-emitting end of the first projection channel, a light-collecting cover disposed on the first projection channel, a light source module disposed at the light-inlet end of the first projection channel, and a lens module disposed at the light-emitting end of the second projection channel. The housing also includes an internal circulation heat dissipation channel, a semiconductor cooling module disposed on the internal circulation heat dissipation channel for cooling circulating air, and an internal circulation fan for providing circulation power for the air in the internal circulation heat dissipation channel. The internal circulation heat dissipation channel extends sequentially from the light-inlet end of the first projection channel along the length of the first and second projection channels to the light-emitting end of the second projection channel. The LCD panel module is located on the internal circulation heat dissipation channel, and the internal circulation fan is located below the lens module.

[0008] The active cooling internal circulation heat dissipation LCD projector of the present invention comprises an L-shaped internal circulation heat dissipation channel with its horizontal end facing downwards and an internal circulation fan located at the end of its vertical end; a light-collecting cover is located on the side opposite to the horizontal end and the vertical end, a semiconductor cooling module is located on the side opposite to the horizontal end and the vertical end, the LCD panel module and the semiconductor cooling module are both located on the air inlet section of the internal circulation heat dissipation channel, the light-collecting cover is located on the air outlet section of the internal circulation heat dissipation channel, and the sidewall of the light-collecting cover is directly connected to the internal circulation heat dissipation channel.

[0009] The active cooling internal circulation heat dissipation LCD projector of the present invention includes a semiconductor cooling module comprising heat exchange fins located on the internal circulation heat dissipation channel, a semiconductor cooling chip for cooling the heat exchange fins, and a first heat sink for dissipating heat from the hot end of the semiconductor cooling chip; the outer shell is provided with a window corresponding to the semiconductor cooling chip that is directly connected to the internal circulation heat dissipation channel, and the first heat sink is provided with a sealing plate for sealing the window; when assembled, the semiconductor cooling chip and the first heat sink are respectively located on the inner and outer sides of the sealing plate.

[0010] The active cooling internal circulation heat dissipation LCD projector of the present invention further includes a first heat insulation layer on the inner side of the sealing plate to prevent heat exchange between the cold air in the internal circulation heat dissipation channel and the sealing plate.

[0011] The active cooling internal circulation heat dissipation LCD projector of the present invention, wherein the heat exchange fins are disposed on the air inlet section of the internal circulation heat dissipation channel and located on the air inlet side of the LCD panel module, and a second heat insulation layer is provided between the heat exchange fins and the hot end of the semiconductor cooling chip.

[0012] The active cooling internal circulation heat dissipation LCD projector of the present invention further includes a heat-conducting component disposed below the light source module to conduct heat out of the light source module, and a second heat sink to diffuse heat from the heat-conducting component to the outside; the second heat sink is located on the outside of the housing and connected to the end of the heat-conducting component away from the light source module; a recess is provided on the housing below the lens module, the second heat sink is disposed in the recess, and a cooling fan is also provided in the recess to cool the second heat sink.

[0013] The active cooling internal circulation heat dissipation LCD projector of the present invention includes a heat-conducting component comprising a first heat-conducting sheet attached to the lower surface of the light source module, a second heat-conducting sheet attached to the second heat sink, and a heat-conducting pipe for transferring heat from the first heat-conducting sheet to the second heat-conducting sheet; the heat-conducting pipe penetrates the outer shell.

[0014] The active cooling internal circulation heat dissipation LCD projector of the present invention comprises a housing having a vertical portion adapted to the first projection channel and a horizontal portion adapted to the second projection channel, wherein the light source module and the light condenser are both disposed within the vertical portion, and the LCD panel module, the reflection module, and the lens module are all disposed within the horizontal portion.

[0015] The active cooling internal circulation heat dissipation LCD projector of the present invention includes a cavity body inside the outer shell, the cavity body being arranged along the arrangement direction of the first projection channel and the second projection channel, a partition plate being provided inside the cavity body along its length direction, and the cavities on the upper and lower sides of the partition plate forming the internal circulation heat dissipation channel, the LCD panel module and the light-concentrating cover being located on the upper and lower sides of the partition plate respectively, and the partition plate having a projection port corresponding to the light-concentrating cover's light outlet for allowing light to enter the LCD panel module, and the light-concentrating cover sealing the projection port when assembled in place.

[0016] A heat dissipation method for an active cooling internal circulation heat dissipation LCD projector is provided, the method comprising the following steps:

[0017] The projector begins to operate when the light source module and the LCD panel module are activated.

[0018] Start the internal circulation fan to circulate the air in the internal circulation heat dissipation channel;

[0019] The semiconductor cooling module is activated to cool the air flowing within the internal circulation heat dissipation channel.

[0020] The beneficial effects of this invention are as follows: An active internal circulation cooling method can be achieved through the semiconductor cooling module. Compared to the traditional method of drawing external cold air into the projector to cool the heat dissipation components, this solution avoids dust entering the projector and causing corrosion and damage to the components. Furthermore, the semiconductor cooling module can efficiently dissipate heat for the LCD panel module, further ensuring the normal operation of the projector and preventing overheating that could lead to system crashes. Moreover, the overall structural layout fully utilizes the empty space below the lens module to install the internal circulation fan, making full use of the available space in the optical path structure, ensuring a compact and small overall size. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0022] Figure 1 This is a bird's-eye view of the front side of the active cooling internal circulation heat dissipation LCD projector of the present invention.

[0023] Figure 2 This is a bird's-eye view of the rear side of the active cooling internal circulation heat dissipation LCD projector of the present invention.

[0024] Figure 3 This is a front view of the active cooling internal circulation heat dissipation LCD projector of the present invention.

[0025] Figure 4 yes Figure 3 AA sectional view.

[0026] Figure 5 yes Figure 4 Exploded view of the local structure.

[0027] Figure 6 This is a three-dimensional view of the internal structure of the active cooling internal circulation heat dissipation LCD projector of the present invention.

[0028] Figure 7 This is a structural diagram of the LCD panel module of the active cooling internal circulation heat dissipation LCD projector of the present invention.

[0029] Figure 8 This is a flowchart of the heat dissipation method steps for the active cooling internal circulation heat dissipation LCD projector of the present invention. Detailed Implementation

[0030] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0033] Furthermore, the terms indicating orientation, such as "up," "down," "left," "right," "upper end," "lower end," and "longitudinal," are all based on the posture and position of the device or equipment described in this solution during normal use.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0035] The preferred embodiment of the present invention is an active cooling internal circulation heat dissipation LCD projector, such as... Figure 1-7As shown, the projector includes a housing 1, within which a first projection channel A1 and a second projection channel A2 are provided. The first projection channel A1 is vertically arranged, and the second projection channel A2 is horizontally arranged. The projector also includes a reflection module 2 that reflects light from the first projection channel A1 into the second projection channel A2; an LCD panel module 3 located at the light-emitting end of the first projection channel A1; a funnel-shaped light-collecting cover 4 located on the first projection channel A1 and wider at the top and narrower at the bottom; a light source module 5 located at the light-inlet end of the first projection channel A1; and a lens module 6 located at the light-emitting end of the second projection channel A2. The housing 1 also includes an internal circulation heat dissipation channel 7, a semiconductor cooling module 8 located on the internal circulation heat dissipation channel 7 to cool the circulating air, and an internal circulation fan 9 to provide circulation power for the air in the internal circulation heat dissipation channel 7. The internal circulation heat dissipation channel 7 receives light from the light-inlet of the first projection channel A1. The end extends sequentially along the length of the first projection channel A1 and the second projection channel A2 to the light-emitting end of the second projection channel A2. The LCD panel module 3 is located on the internal circulation heat dissipation channel 7, and the internal circulation fan 9 is located below the lens module 6. The active internal circulation heat dissipation method can be realized through the semiconductor cooling module 8. Compared with the traditional method of drawing external cold air into the projector to dissipate heat from the heat dissipation components, this solution can avoid dust entering the projector and causing corrosion and damage to the components. Moreover, the semiconductor cooling module 8 can also efficiently dissipate heat for the LCD panel module 3, which can further provide temperature guarantee for the normal operation of the projector and prevent the system from crashing due to overheating. In addition, the layout of the overall structure makes full use of the empty space below the lens module 6 to install the internal circulation fan 9, making full use of the empty space in the optical path structure and ensuring that the overall size is compact and small.

[0036] Preferably, the internal circulation heat dissipation channel 7 is L-shaped with its horizontal end facing downwards, and an internal circulation fan 9 is provided at the end of the vertical end of the internal circulation heat dissipation channel 7; the light-collecting cover 4 is located on the side opposite to the horizontal end and the vertical end, and the semiconductor cooling module 8 is located on the side opposite to the horizontal end and the vertical end. Both the LCD panel module 3 and the semiconductor cooling module 8 are located on the air inlet section of the internal circulation heat dissipation channel 7, and the light-collecting cover 4 is located on the air outlet section of the internal circulation heat dissipation channel 7. The side wall of the light-collecting cover 4 is directly connected to the internal circulation heat dissipation channel 7, so as to cool the LCD panel module 3 and the light-collecting cover 4 at the same time. Compared with the traditional single cooling method that only cools the LCD panel module 3, the cooling effect of this solution is more obvious. Even after prolonged operation, the projector maintains an internal temperature below the threshold with a significant temperature difference, avoiding the common issue of traditional projectors where a single cooling method results in the operating temperature closely matching the threshold, preventing the equipment from operating at extreme temperatures for extended periods and impacting the lifespan of projector components. Furthermore, the L-shaped internal circulation heat dissipation channel 7 effectively balances the projection's optical path structure and heat dissipation efficiency, allowing for a more rational placement of the condenser 4 and semiconductor cooling module 8. It fully utilizes the space below the second projection channel A2, resulting in a more compact overall structure and facilitating the installation of the heat dissipation structure at the hot end of the semiconductor cooling module 8, while avoiding any conflict with the position of the condenser 4.

[0037] Preferably, the semiconductor cooling module 8 includes heat exchange fins 81, a semiconductor cooling chip 82 for cooling the heat exchange fins 81, and a first heat sink 83 for dissipating heat from the semiconductor cooling chip 82. The outer casing 1 has a window 7a corresponding to the semiconductor cooling chip 82, which is directly connected to the internal circulation heat dissipation channel 7. The first heat sink 83 has a sealing plate 831 that seals the window 7a. When assembled, the semiconductor cooling chip 82 and the first heat sink 83 are located on the inner and outer sides of the sealing plate 831, respectively. The first heat sink 83 and the sealing plate 831 are integrally formed and both are made of aluminum. Of course, other materials with good thermal conductivity can also be used. This solution forms a layered installation structure by opening a window 7a on the outer casing 1 that is directly connected to the internal circulation heat dissipation channel and sealing the window with the sealing plate 831. This facilitates assembly and allows for quick disassembly of the semiconductor cooling chip during later maintenance and disassembly operations. This optimizes the structural layout of the projector, reduces the material usage of the outer casing 1 and the sealing structure with the semiconductor cooling chip, and further improves the efficiency of heat dissipation and cooling.

[0038] Preferably, the inner side of the sealing plate 831 is also provided with a first heat insulation layer 17 to prevent the cold air in the internal circulation heat dissipation channel 7 from exchanging heat with the sealing plate 631, so as to avoid the heat on the sealing plate 831 being transferred to the cold air in the internal circulation heat dissipation channel, thereby reducing the heat dissipation efficiency. Furthermore, in order to ensure the cooling effect, the area of ​​the heat exchange fin 81 in contact with the semiconductor cooling chip is larger than the surface area of ​​the semiconductor cooling chip. In order to prevent the heat on the first heat sink 83 from radiating to the heat exchange fin, a second heat insulation layer 18 is provided around the semiconductor cooling chip. The second heat insulation layer 18 is located on the side of the heat exchange fin 81 facing the semiconductor cooling chip and is attached to the sealing plate.

[0039] The LCD panel module 3 includes two panel bodies 31 facing each other, and a panel bracket 32 ​​for fixing the two panel bodies 31. The longitudinal end of the internal circulation heat dissipation channel 7 passes through the gap 3a between the two panel bodies 31. The two LCD panel bodies 31 together form the two inner walls of the internal circulation heat dissipation channel 7, which can achieve the effect of directly cooling and dissipating heat for the two panel bodies 31 at the same time, reducing the use of heat-conducting components, simplifying the structure, and reducing costs.

[0040] Preferably, the heat exchange fins 81 are disposed on the air inlet section of the internal circulation heat dissipation channel 7 and located on the air inlet side of the LCD panel module 3, and a second heat insulation layer is provided between the heat exchange fins and the hot end of the semiconductor cooling chip.

[0041] Preferably, the projector further includes a heat-conducting component 10 disposed below the light source module 5 to conduct heat from the light source module 5, and a second heat sink 11 to diffuse heat from the heat-conducting component 10 to the outside; the second heat sink 11 is located on the outside of the housing 1 and connected to the end of the heat-conducting component 10 away from the light source module 5. A recess 12 is provided on the housing 1 below the lens module 6, and the second heat sink 11 is disposed on the recess 12. A cooling fan 13 is also provided on the recess 12 to blow heat from the second heat sink 11, wherein the cooling fan 13 is located on the second heat sink 11. Specifically, on the front side, the heat-conducting component 10 includes a first heat-conducting sheet 10a that is attached to the lower surface of the light source module 5, a second heat-conducting sheet 10b that is attached to the second heat sink 11, and a heat-conducting pipe 10c that transfers heat from the first heat-conducting sheet 10a to the second heat-conducting sheet 10b. The heat-conducting pipe 10c penetrates the outer shell 1. Through the cooperation of the first heat-conducting sheet 10a, the second heat-conducting sheet 10b and the heat-conducting pipe 10c, the position of the second heat-conducting sheet 10b can be flexibly set, making full use of the space below the lens module and improving the overall structural compactness of the projector.

[0042] Preferably, the projector also includes a focusing module 14 for adjusting the focal length of the lens module 6, the focusing module 14 being disposed on the housing 1.

[0043] Preferably, the outer casing 1 is formed with a vertical portion 1a adapted to the first projection channel A1 and a horizontal portion 1b adapted to the second projection channel A2. The space below the horizontal portion 1b forms the aforementioned recessed position 12. The light source module 5 and the light-collecting cover 4 are both disposed within the vertical portion 1a, while the LCD panel module 3, the reflection module 2, and the lens module 6 are all disposed within the horizontal portion 1b. Furthermore, the outer casing 1 is provided with a cavity body a1, which is arranged along the arrangement direction of the first projection channel A1 and the second projection channel A2, i.e., the cavity body a1 is also L-shaped. A partition a2 is provided within the cavity body a1 along its length. The partition a2 divides the internal space of the partition body into two elongated cavities that are vertically and horizontally connected, thereby forming an internal circulation heat dissipation channel 7 between the cavities on the upper and lower sides of the partition a2. The LCD panel module 3 and the light-collecting cover 4 are respectively located on the upper and lower sides of the partition a2. The plate a2 has a projection port 15 corresponding to the light outlet of the light-concentrating cover 4, which allows light to enter the LCD panel module 3. Furthermore, the upper end of the cavity body a1 also has mounting holes 16 corresponding to the LCD panel module 3, so as to facilitate the LCD panel module 3 to be inserted into the inner circulation heat dissipation channel 7 for direct cooling. When assembled, the light-concentrating cover 4 seals the projection port 15 to ensure that the air in the inner circulation heat dissipation channel 7 has sufficient speed to circulate normally. Specifically, the outer shell 1 includes a left half shell 101 and a right half shell 102 that cooperates with the left half shell 101 to form a sealed cavity. The left half shell 101 and the right half shell 102 are detachably connected. The cavity body a1 is divided into two halves corresponding to the left half shell 101 and the right half shell 102 and is located on the inner sidewalls of the two halves, so as to facilitate disassembly and assembly. In addition, the LCD panel module 3 and the light-concentrating cover 4 can also be directly fixed through the cavity body a1, which reduces the use of connecting parts and serves multiple purposes.

[0044] The preferred embodiment of the present invention provides a heat dissipation method for an active cooling internal circulation heat dissipation LCD projector, such as... Figure 8 As shown, the method includes the following steps:

[0045] Step S10: Start the light source module 5 and LCD panel module 3, and the projector will begin to work;

[0046] Step S20: Start the internal circulation fan 9 to circulate the air in the internal circulation heat dissipation channel 7;

[0047] Step S30: Activate the semiconductor cooling module 8 to cool the air flowing in the internal circulation heat dissipation channel 7.

[0048] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An active cooling internal circulation heat dissipation LCD projector, characterized in that, The projector includes a housing, within which a first projection channel and a second projection channel are provided. The first projection channel is vertically arranged, and the second projection channel is horizontally arranged. The projector also includes a reflector module that reflects light from the first projection channel into the second projection channel, an LCD panel module located at the light-emitting end of the first projection channel, a light-collecting cover located on the first projection channel, a light source module located at the light-inlet end of the first projection channel, and a lens module located at the light-emitting end of the second projection channel. The housing also includes an internal circulation cooling channel, a semiconductor cooling module located on the internal circulation cooling channel for cooling circulating air, and an internal circulation fan that provides circulation power for the air in the internal circulation cooling channel. The internal circulation cooling channel extends sequentially from the light-inlet end of the first projection channel along the length of the first and second projection channels to the light-emitting end of the second projection channel. The LCD panel module is located on the internal circulation cooling channel, and the internal circulation fan is located below the lens module. The internal circulation heat dissipation channel is L-shaped with its horizontal end facing downwards, and the internal circulation fan is located at the end of its vertical end; the light-concentrating cover is located on the side opposite to the horizontal end and the vertical end, the semiconductor cooling module is located on the side opposite to the horizontal end and the vertical end, the LCD panel module and the semiconductor cooling module are both located on the air inlet section of the internal circulation heat dissipation channel, the light-concentrating cover is located on the air outlet section of the internal circulation heat dissipation channel, and the side wall of the light-concentrating cover is directly connected to the internal circulation heat dissipation channel; The projector also includes a heat-conducting component disposed below the light source module to conduct heat from the light source module, and a second heat sink to diffuse heat from the heat-conducting component to the outside; the second heat sink is located on the outside of the housing and connected to the end of the heat-conducting component away from the light source module; a recess is provided on the housing below the lens module, the second heat sink is disposed in the recess, and a cooling fan is also provided in the recess to cool the second heat sink.

2. The active cooling internal circulation heat dissipation LCD projector according to claim 1, characterized in that, The semiconductor cooling module includes heat exchange fins located on the internal circulation heat dissipation channel, a semiconductor cooling chip for cooling the heat exchange fins, and a first heat sink for dissipating heat from the hot end of the semiconductor cooling chip. The outer casing has a window corresponding to the semiconductor cooling chip that is directly connected to the internal circulation heat dissipation channel. The first heat sink has a sealing plate for sealing the window. When assembled, the semiconductor cooling chip and the first heat sink are located on the inner and outer sides of the sealing plate, respectively.

3. The active cooling internal circulation heat dissipation LCD projector according to claim 2, characterized in that, The inner side of the sealing plate is also provided with a first heat insulation layer to prevent the cold air in the internal circulation heat dissipation channel from exchanging heat with the sealing plate.

4. The active cooling internal circulation heat dissipation LCD projector according to claim 2, characterized in that, The heat exchange fins are disposed on the air inlet section of the internal circulation heat dissipation channel and located on the air inlet side of the LCD panel module. A second heat insulation layer is provided between the heat exchange fins and the hot end of the semiconductor cooling chip.

5. The active cooling internal circulation heat dissipation LCD projector according to claim 1, characterized in that, The heat-conducting component includes a first heat-conducting sheet that is attached to the lower surface of the light source module, a second heat-conducting sheet that is attached to the second heat sink, and a heat-conducting pipe that transfers heat from the first heat-conducting sheet to the second heat-conducting sheet; the heat-conducting pipe penetrates the outer shell.

6. The active cooling internal circulation heat dissipation LCD projector according to claim 1, characterized in that, The outer shell is formed with a vertical portion adapted to the first projection channel and a horizontal portion adapted to the second projection channel. The light source module and the light condenser are both disposed in the vertical portion, and the LCD panel module, the reflection module and the lens module are all disposed in the horizontal portion.

7. The active cooling internal circulation heat dissipation LCD projector according to claim 1 or 6, characterized in that, The outer shell contains a cavity body, which is arranged along the layout direction of the first projection channel and the second projection channel. A partition is provided inside the cavity body along its length. The cavities on the upper and lower sides of the partition together form the internal circulation heat dissipation channel. The LCD panel module and the light-concentrating cover are located on the upper and lower sides of the partition, respectively. The partition has a projection port corresponding to the light-concentrating cover's light outlet for allowing light to enter the LCD panel module. When assembled, the light-concentrating cover seals the projection port.

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