CN219695609U - Active refrigeration type internal circulation heat dissipation LCD projector - Google Patents

Abstract

The utility model relates to an active refrigeration type internal circulation heat dissipation LCD projector, which comprises a shell, wherein a first projection channel which is vertically arranged and a second projection channel which is horizontally arranged are arranged in the shell; the shell is internally provided with an internal circulation heat dissipation channel, a semiconductor refrigeration module arranged on the internal circulation heat dissipation channel and an internal circulation fan for realizing air circulation; the inner circulation heat dissipation channel sequentially 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, the LCD panel module is positioned on the inner circulation heat dissipation channel, and the inner circulation fan is positioned below the lens module; the semiconductor refrigeration module realizes an active internal circulation heat dissipation mode, so that dust can be prevented from entering the projector, the LCD panel module can be efficiently dissipated, and the internal circulation fan is mounted at the position below the lens module.

Description

Active refrigeration type internal circulation heat dissipation LCD projector

Technical Field

The utility model relates to the technical field of projectors, in particular to an active refrigeration type internal circulation heat dissipation LCD projector.

Background

The projector is a device capable of projecting images or videos onto a curtain, and can be connected with external devices such as a computer, a VCD, DVD, BD, a game machine, a DV and the like through different interfaces, and play corresponding video signals.

With the continuous development of modern projector technology, the integration level of parts in the projector is higher and higher, and the volume of the parts is smaller and smaller, so that the projector is widely applied to families, offices, schools and entertainment places. In projectors, a light output device, such as a light engine of the projector, is required to provide light source projection. Because the ray apparatus belongs to high-power equipment, the temperature is high and calorific capacity is big during operation, leads to the temperature in the casing too high very easily, and leads to the electrical component in the projecting apparatus to damage, or shortens the life of projecting apparatus, influences the normal use of projecting apparatus.

In the prior art, the projector disclosed in patent utility model CN211293574U or CN217060746U is often provided with a fan and an open heat dissipation groove, a radiator is additionally arranged in the projector, and the heat in the projector is replaced with external cold air by using the radiator and the radiator, so that the open heat dissipation mode has a lower heat dissipation effect and a slower heat dissipation speed, and external dust is often introduced into the projector through the open heat dissipation groove in the heat dissipation process, and a large amount of dust is retained in the projector, so that the projector is corroded by the dust, and the use of the projector is affected; in addition, the optical path structure of the projector is unreasonable in design, and each cooling fan and cooling fins are arranged on the projector in a disordered way, so that the overall structure of the projector cannot be simplified by fully utilizing the arrangement mode of the optical path structure.

Disclosure of Invention

The present utility model is directed to solving the above-mentioned problems by providing an active cooling type internal circulation heat dissipation LCD projector, which solves the problems of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the LCD projector comprises a shell, wherein a first projection channel and a second projection channel are arranged in the shell, the first projection channel is vertically arranged, and the second projection channel is horizontally arranged; the projector also comprises a reflection module for reflecting light rays on a first projection channel into the second projection channel, an LCD panel module arranged at the light emitting end of the first projection channel, a light gathering cover arranged on the first projection channel, a light source module arranged at the light inlet end of the first projection channel, and a lens module arranged at the light emitting end of the second projection channel; an inner circulation heat dissipation channel, a semiconductor refrigeration module which is arranged on the inner circulation heat dissipation channel and used for refrigerating circulating air, and an inner circulation fan which is used for providing circulation power for the air on the inner circulation heat dissipation channel are also arranged in the shell; 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 in sequence along the length directions of the first projection channel and the second projection channel, the LCD panel module is positioned on the inner circulation heat dissipation channel, and the inner circulation fan is positioned below the lens module.

The utility model relates to an active refrigeration type internal circulation heat dissipation LCD projector, wherein the internal circulation heat dissipation channel is L-shaped, the transverse end of the internal circulation heat dissipation channel is downward, and the tail end of the longitudinal end of the internal circulation heat dissipation channel is provided with an internal circulation fan; the light condensing cover is positioned on one side of the transverse end opposite to the longitudinal end, the semiconductor refrigeration module is arranged on one side of the transverse end opposite to the longitudinal end, the LCD panel module and the semiconductor refrigeration module are both positioned on an air inlet section of the internal circulation heat dissipation channel, the light condensing cover is positioned on an air outlet section of the internal circulation heat dissipation channel, and the side wall of the light condensing cover is directly communicated with the internal circulation heat dissipation channel.

The utility model discloses an active refrigeration type internal circulation heat dissipation LCD projector, wherein a semiconductor refrigeration module comprises a heat exchange fin arranged on an internal circulation heat dissipation channel, a semiconductor refrigeration sheet for cooling the heat exchange fin, and a first heat dissipation sheet for dissipating heat of a hot end of the semiconductor refrigeration sheet; the shell is provided with a window which is directly communicated with the internal circulation heat dissipation channel and corresponds to the semiconductor refrigerating sheet, the first radiating sheet is provided with a sealing plate for sealing the window, and when the shell is assembled in place, the semiconductor refrigerating sheet and the first radiating sheet are respectively positioned at the inner side and the outer side of the sealing plate.

The utility model discloses an active refrigeration type internal circulation heat dissipation LCD projector, wherein a first heat insulation layer for preventing cold air in an internal circulation heat dissipation channel from heat exchange with a sealing plate is further arranged on the inner side surface of the sealing plate.

The utility model discloses an active refrigeration type internal circulation heat dissipation LCD projector, wherein heat exchange fins are arranged on an air inlet section of an internal circulation heat dissipation channel and positioned on an air inlet side of an LCD panel module, and a second heat insulation layer is arranged between the heat exchange fins and a hot end of a semiconductor refrigeration sheet.

The utility model relates to an active refrigeration type internal circulation heat dissipation LCD projector, wherein the projector further comprises a heat conduction piece arranged below a light source module and used for conducting heat on the light source module out, and a second heat dissipation sheet used for diffusing the heat on the heat conduction piece to the outside; the second cooling fin is located the outside of shell and with the heat conduction spare deviates from the one end of light source module is connected, be located on the shell the below of camera lens module is equipped with the sunken position, the second cooling fin is located on the sunken position, still be equipped with on the sunken position and be used for the radiator fan of second cooling fin blowing fan heat.

The utility model relates to an active refrigeration type internal circulation heat dissipation LCD projector, wherein the heat conduction piece comprises a first heat conduction sheet, a second heat conduction sheet and a heat conduction pipe, wherein the first heat conduction sheet is attached to the lower surface of a light source module, the second heat conduction sheet is attached to the second heat dissipation sheet, and the heat conduction pipe is used for transferring heat on the first heat conduction sheet to the second heat conduction sheet; the heat conduction pipe penetrates through the shell.

The utility model discloses an active refrigeration type internal circulation heat dissipation LCD projector, wherein a vertical part matched with a first projection channel and a transverse part matched with a second projection channel are formed on a shell, a light source module and a light condensing cover are arranged in the vertical part, and an LCD panel module, a reflection module and a lens module are arranged in the transverse part.

The utility model discloses an active refrigeration type internal circulation heat dissipation LCD projector, wherein a separation cavity body is arranged in a shell, the separation cavity body is arranged along the arrangement direction of a first projection channel and a second projection channel, a partition plate is arranged in the separation cavity body along the length direction of the separation cavity body, cavities on the upper side and the lower side of the partition plate jointly form the internal circulation heat dissipation channel, an LCD panel module and a light condensing cover are respectively positioned on the upper side and the lower side of the partition plate, a projection port for light to enter the LCD panel module is arranged on the partition plate corresponding to a light outlet of the light condensing cover, and when the liquid condensing cover is assembled in place, the projection port is sealed.

Provided is a heat dissipation method of an active refrigeration type internal circulation heat dissipation LCD projector, comprising the following steps:

starting the light source module and the LCD panel module, and starting the projector to work;

starting the internal circulation fan to enable the air of the internal circulation heat dissipation channel to realize circulation flow;

and starting the semiconductor refrigeration module to cool the flowing air in the internal circulation heat dissipation channel.

The utility model has the beneficial effects that: can realize active inner loop heat dissipation mode through semiconductor refrigeration module, compare the tradition with outside cold air suction projector inside carry out radiating mode to radiating part, this scheme can avoid the dust to get into inside erosion and the damage that causes spare part of projecting apparatus, but also can dispel the heat for LCD panel module through semiconductor refrigeration module high-efficiently, can further provide the temperature assurance for the normal work of projecting apparatus, prevent that the high temperature from leading to the dead halt, moreover, make full use of the vacant position installation inner loop fan of camera lens module below on overall structure's overall arrangement, make full use of the vacancy of arranging of light path structure, guarantee compact and small-size as a whole.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the present utility model will be further described with reference to the accompanying drawings and embodiments, in which the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained by those skilled in the art without inventive effort:

fig. 1 is a front side view of an active refrigeration type internal circulation heat dissipation LCD projector according to the present utility model.

Fig. 2 is a rear side view of an active refrigeration type internal circulation heat dissipation LCD projector according to the present utility model.

Fig. 3 is a front view of an actively cooled internal circulation heat sink LCD projector according to the present utility model.

Fig. 4 is a cross-sectional view A-A of fig. 3.

Fig. 5 is an exploded view of the partial structure of fig. 4.

Fig. 6 is a perspective view of the internal structure of the active cooling type internal circulation heat dissipation LCD projector according to the present utility model.

Fig. 7 is a block diagram of an LCD panel module of an active refrigeration type internal circulation heat dissipation LCD projector according to the present utility model.

Detailed Description

The terms "first," "second," "third," and "fourth" and the like in the description and in the claims and drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

"plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Moreover, the terms "upper, lower, left, right, upper end, lower end, longitudinal" and the like that represent the orientation are all referred to with reference to the attitude position of the apparatus or device described in this scheme when in normal use.

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the following description will be made in detail with reference to the technical solutions in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present utility model, based on the embodiments of the present utility model.

As shown in fig. 1-7, the active refrigeration type internal circulation heat dissipation LCD projector of the preferred embodiment of the present utility model comprises a housing 1, wherein a first projection channel A1 and a second projection channel A2 are arranged in the housing 1, the first projection channel A1 is vertically arranged, and the second projection channel A2 is horizontally arranged; the projector also comprises a reflection module 2 for reflecting the light rays on the first projection channel A1 into the second projection channel A2, an LCD panel module 3 arranged at the light emitting end of the first projection channel A1, a funnel-shaped light condensing cover 4 arranged on the first projection channel A1 and having a wide upper part and a narrow lower part, a light source module 5 arranged at the light inlet end of the first projection channel A1, and a lens module 6 arranged at the light emitting end of the second projection channel A2; the shell 1 is also internally provided with an internal circulation heat dissipation channel 7, a semiconductor refrigeration module 8 which is arranged on the internal circulation heat dissipation channel 7 and used for refrigerating circulation air, and an internal circulation fan 9 which is used for providing circulation power for the air on the internal circulation heat dissipation channel 7; the inner circulation heat dissipation channel 7 extends from the light inlet end of the first projection channel A1 to the light outlet end of the second projection channel A2 along the length direction of the first projection channel A1 and the second projection channel A2 in sequence, the LCD panel module 3 is positioned on the inner circulation heat dissipation channel 7, and the inner circulation fan 9 is positioned below the lens module 6; can realize active inner loop heat dissipation mode through semiconductor refrigeration module 8, compare the tradition with outside cold air suction projector inside carry out radiating mode to radiating part, this scheme can avoid the dust to get into the inside erosion and the damage that causes spare part of projecting apparatus, but also can dispel the heat for LCD panel module 3 through semiconductor refrigeration module 8 high-efficiently, can further provide the temperature assurance for the normal work of projecting apparatus, prevent that the high temperature from leading to the dead halt, moreover, make full use of the vacant position installation inner loop fan 9 of camera lens module 6 below on overall structure's overall structure, make full use of the vacancy of arranging of light path structure, guarantee compact and small in size.

Preferably, the inner circulation heat dissipation channel 7 is L-shaped with the transverse end facing downwards, and the tail end of the longitudinal end of the inner circulation heat dissipation channel 7 is provided with an inner circulation fan 9; the light-condensing cover 4 is positioned on one side of the transverse end opposite to the longitudinal end, the semiconductor refrigeration module 8 is arranged on one side of the transverse end opposite to the longitudinal end, the LCD panel module 3 and the semiconductor refrigeration module 8 are both positioned on an air inlet section of the inner circulation heat dissipation channel 7, the light-condensing cover 4 is positioned on an air outlet section of the inner circulation heat dissipation channel 7, the side wall of the light-condensing cover 4 is directly communicated with the inner circulation heat dissipation channel 7 so as to cool the LCD panel module 3 and simultaneously cool the light-condensing cover 4, compared with the traditional single cooling mode only for cooling the LCD panel module 3, the cooling effect of the scheme is more obvious, the temperature inside can still be ensured to be lower than a threshold value after the projector works for a long time, the temperature difference value with the threshold value is larger, the working temperature caused by the single cooling mode of the traditional projector is not basically consistent with the threshold value, so that instruments and equipment are positioned at the limiting working temperature for a long time, and the service life of parts of the projector is further influenced; in addition, the inner circulation heat dissipation channel 7 with the L shape can fully consider the projected light path structure and heat dissipation efficiency, so that the position installation of the light condensing cover 4 and the semiconductor refrigeration module 8 is more reasonable, the position below the second projection channel A2 is fully utilized, the whole structure is more compact, the installation of the heat dissipation structure of the heat end of the semiconductor refrigeration module 8 is more facilitated, and the position conflict with the light condensing cover 4 is avoided.

Preferably, the semiconductor refrigeration module 8 includes heat exchange fins 81, and semiconductor refrigeration sheets 82 for cooling the heat exchange fins 81, and first heat dissipation sheets 83 for dissipating heat from the semiconductor refrigeration sheets 82; the shell 1 is provided with a window 7a which is directly communicated with the internal circulation cooling channel 7, the first radiating fin 83 is provided with a sealing plate 831 for sealing the window 7a, when the shell 1 is assembled in place, the semiconductor cooling fin 82 and the first radiating fin 83 are respectively positioned at the inner side and the outer side of the sealing plate 831, wherein the first radiating fin 83 and the sealing plate 831 are integrally formed, and all adopt aluminum materials, of course, other materials with good heat conducting performance can also be adopted.

Preferably, the inner side surface of the sealing plate 831 is further provided with a first heat insulation layer 17 for preventing heat exchange between the cold air in the inner circulation heat dissipation channel 7 and the sealing plate 631, so as to prevent heat on the sealing plate 831 from being transferred to the cold air in the inner circulation heat dissipation channel, thereby reducing heat dissipation efficiency.

The LCD panel module 3 includes two panel bodies 31 opposing each other up and down, and a panel bracket 32 fixing the two panel bodies 31; the longitudinal end of the inner circulation heat dissipation channel 7 passes through the gap 3a between the two panel bodies 31, and two inner walls of the inner circulation heat dissipation channel 7 are formed by the two LCD panel bodies 31 together, so that the effect of cooling and heat dissipation of the two panel bodies 31 can be achieved directly, the use of heat conduction pieces is reduced, the structure is simplified, and the cost is reduced.

Preferably, the heat exchange fin 81 is arranged on the air inlet section of the inner circulation heat dissipation channel 7 and is positioned on the air inlet side of the LCD panel module 3, and a second heat insulation layer is arranged between the heat exchange fin and the hot end of the semiconductor refrigeration sheet.

Preferably, the projector further comprises a heat conducting member 10 arranged below the light source module 5 for conducting heat from the light source module 5, and a second heat radiating fin 11 for radiating the heat from the heat conducting member 10 to the outside; the second cooling fin 11 is located at the outer side of the shell 1 and is connected with one end of the heat conducting piece 10, which is away from the light source module 5, a concave position 12 is arranged below the lens module 6 on the shell 1, the second cooling fin 11 is arranged on the concave position 12, a cooling fan 13 for blowing fan heat for the second cooling fin 11 is further arranged on the concave position 12, wherein the cooling fan 13 is located at the front side of the second cooling fin 11, and specifically, the heat conducting piece 10 comprises a first heat conducting fin 10a attached to the lower surface of the light source module 5, a second heat conducting fin 10b attached to the second heat conducting fin 11, and a heat conducting pipe 10c for transferring heat on the first heat conducting fin 10a to the second heat conducting fin 10 b; the heat conduction pipe 10c penetrates through the shell 1, and the flexible setting of the position of the second heat conduction piece 10b can be realized through the cooperation of the first heat conduction piece 10a, the second heat conduction piece 10b and the heat conduction pipe 10c, so that the space position below the lens and the module are conveniently and fully utilized, and the overall structural compactness of the projector is improved.

Preferably, the projector further comprises a focusing module 14 for adjusting the focal length of the lens module 6, and the focusing module 14 is disposed on the housing 1.

Preferably, the casing 1 is formed with a vertical part 1a adapted to the first projection channel A1 and a transverse part 1b adapted to the second projection channel A2, wherein the space below the transverse part 1b forms the concave position 12, the light source module 5 and the light condensing cover 4 are both arranged in the vertical part 1a, the LCD panel module 3, the reflection module 2 and the lens module 6 are both arranged in the transverse part 1b, further, a compartment body A1 is arranged in the casing 1, the compartment body A1 is arranged along the arrangement direction of the first projection channel A1 and the second projection channel A2, namely, the compartment body A1 is also in an L shape, a partition plate A2 is arranged in the compartment body A1 along the length direction, the inner space of the partition plate body is divided into two strip-shaped cavity channels which are mutually communicated at the top and bottom by the partition plate A2, so that the cavities at the top and bottom of the partition plate A2 jointly form an inner circulation heat dissipation channel 7, the LCD panel module 3 and the light condensing cover 4 are respectively arranged at the top and bottom of the partition plate A2, the corresponding to the light outlet of the partition plate a 4 is provided with a light outlet of the light condensing cover 3, the light condensing cover is also provided with a corresponding to the light outlet of the light condensing cover 3, the light condensing cover is further provided with a sealing half-up cavity 15, and the light cooling half-cycle channel is further arranged at the inner side of the air cooling module 1, and the air cooling half-cycle channel is further provided with a sealing speed of the air channel 15, and the air cooling half-sealing shell is provided with a sealing the air channel 1, and the air cooling cavity is provided with a sealing cavity 15, and the air cooling cavity is provided with a sealing the air cavity and a sealing cavity 15, and a sealing space for the air cooling cavity and a sealing the air cooling device, and a sealing cavity and a sealing the air cavity and a sealing device; the left half shell 101 and the right half shell 102 are detachably connected, the separation cavity body a1 is divided into two corresponding to the left half shell 101 and the right half shell 102 and is respectively positioned on the inner side walls of the left half shell 101 and the right half shell 102, so that the separation cavity body a1 is convenient to detach and assemble, in addition, the LCD panel module 3 and the light condensing cover 4 can be directly fixed through the separation cavity body a1, the purpose of reducing the use of connecting parts is achieved, and the separation cavity is multipurpose.

The heat dissipation method of the active refrigeration type internal circulation heat dissipation LCD projector of the preferred embodiment of the utility model is as follows:

step one, starting the light source module 5 and the LCD panel module 3, and starting the projector;

step two, starting an internal circulation fan 9 to enable air in the internal circulation heat dissipation channel 7 to realize circulation flow;

and step three, starting the semiconductor refrigeration module 8 to cool the flowing air in the internal circulation heat dissipation channel 7.

It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.

Claims (9)

1. The active refrigeration type internal circulation heat dissipation LCD projector is characterized by comprising a shell, wherein a first projection channel and a second projection channel are arranged in the shell, the first projection channel is vertically arranged, and the second projection channel is horizontally arranged; the projector also comprises a reflection module for reflecting light rays on a first projection channel into the second projection channel, an LCD panel module arranged at the light emitting end of the first projection channel, a light gathering cover arranged on the first projection channel, a light source module arranged at the light inlet end of the first projection channel, and a lens module arranged at the light emitting end of the second projection channel; an inner circulation heat dissipation channel, a semiconductor refrigeration module which is arranged on the inner circulation heat dissipation channel and used for refrigerating circulating air, and an inner circulation fan which is used for providing circulation power for the air on the inner circulation heat dissipation channel are also arranged in the shell; 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 in sequence along the length directions of the first projection channel and the second projection channel, the LCD panel module is positioned on the inner circulation heat dissipation channel, and the inner circulation fan is positioned below the lens module.

2. The active cooling type internal circulation heat dissipation LCD projector according to claim 1, wherein the internal circulation heat dissipation channel is L-shaped with a lateral end facing downward and a longitudinal end thereof is provided with the internal circulation fan; the light condensing cover is positioned on one side of the transverse end opposite to the longitudinal end, the semiconductor refrigeration module is arranged on one side of the transverse end opposite to the longitudinal end, the LCD panel module and the semiconductor refrigeration module are both positioned on an air inlet section of the internal circulation heat dissipation channel, the light condensing cover is positioned on an air outlet section of the internal circulation heat dissipation channel, and the side wall of the light condensing cover is directly communicated with the internal circulation heat dissipation channel.

3. The active refrigeration type internal circulation heat dissipation LCD projector according to claim 2, wherein the semiconductor refrigeration module includes a heat exchange fin on the internal circulation heat dissipation channel, and a semiconductor refrigeration sheet for cooling the heat exchange fin, and a first heat dissipation sheet for dissipating heat from a hot end of the semiconductor refrigeration sheet; the shell is provided with a window which is directly communicated with the internal circulation heat dissipation channel and corresponds to the semiconductor refrigerating sheet, the first radiating sheet is provided with a sealing plate for sealing the window, and when the shell is assembled in place, the semiconductor refrigerating sheet and the first radiating sheet are respectively positioned at the inner side and the outer side of the sealing plate.

4. The active-refrigeration type internal-circulation heat dissipation LCD projector according to claim 3, wherein a first heat insulating layer for preventing heat exchange between the cold air in the internal-circulation heat dissipation path and the sealing plate is further provided on the inner side surface of the sealing plate.

5. The LCD projector of claim 3, wherein the heat exchanging fin is disposed on the air inlet section of the internal circulation heat dissipation channel and on the air inlet side of the LCD panel module, and a second heat insulating layer is disposed between the heat exchanging fin and the heat end of the semiconductor cooling sheet.

6. The active cooling type internal circulation heat dissipation LCD projector according to claim 1, further comprising a heat conduction member provided under the light source module to conduct out heat on the light source module, and a second heat dissipation fin to diffuse heat on the heat conduction member to the outside; the second cooling fin is located the outside of shell and with the heat conduction spare deviates from the one end of light source module is connected, be located on the shell the below of camera lens module is equipped with the sunken position, the second cooling fin is located on the sunken position, still be equipped with on the sunken position and be used for the radiator fan of second cooling fin blowing fan heat.

7. The active cooling type internal circulation heat dissipation LCD projector according to claim 6, wherein the heat conductive member comprises a first heat conductive sheet attached to a lower surface of the light source module, and a second heat conductive sheet attached to the second heat conductive sheet, and a heat conductive pipe transferring heat from the first heat conductive sheet to the second heat conductive sheet; the heat conduction pipe penetrates through the shell.

8. The active cooling type internal circulation heat dissipation LCD projector according to claim 1, wherein the housing is formed with a vertical portion adapted to the first projection channel and a lateral portion adapted to the second projection channel, the light source module and the light-condensing cover are both disposed in the vertical portion, and the LCD panel module, the reflection module and the lens module are both disposed in the lateral portion.

9. The active refrigeration type internal circulation heat dissipation LCD projector according to claim 1 or 8, wherein a compartment body is arranged in the housing, the compartment body is arranged along the arrangement direction of the first projection channel and the second projection channel, a partition board is arranged in the compartment body along the length direction of the compartment body, cavities on the upper side and the lower side of the partition board jointly form the internal circulation heat dissipation channel, the LCD panel module and the light-gathering cover are respectively located on the upper side and the lower side of the partition board, a projection port for light to enter the LCD panel module is arranged on the partition board corresponding to a light outlet of the light-gathering cover, and the light-gathering cover seals the projection port when the light-gathering cover is assembled in place.