Liquid crystal display (LCD) projector with internal circulation double fans connected in series for heat dissipation

Abstract

The invention relates to an internal circulation double-fan series heat dissipation LCD projector, which comprises a projection shell and a closed light machine installed in the projection shell, and is characterized in that the closed light machine comprises a light machine shell, an internal circulation fan unit, a heat dissipation module and an external circulation fan unit; a first end of a first heat dissipation air channel, a top heat exchange cavity, a side air passing cavity, a second heat dissipation air channel, a side heat exchange cavity, a middle air passing cavity, a second ventilation opening, a second containing cavity, a first ventilation opening and a second end of the first heat dissipation air channel in the closed light machine are sequentially communicated to form an internal circulation heat dissipation channel. Through the position design of the heat dissipation channel, the fans and the radiator, the internal circulation heat dissipation channel with more reasonable space is obtained, and the air quantity of single circulation is accelerated by the first internal circulation fan and the second internal circulation fan which are connected in series and is utilized twice, so that the air pressure and the air quantity are increased, the flow field of the internal circulation heat dissipation channel becomes relatively ordered, and the heat dissipation efficiency is improved. A flow field is conveniently and accurately simulated, and more accurate heat dissipation design is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of LCD projectors, and in particular to an LCD projector with internal circulation dual fans connected in series for heat dissipation. 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] At present, the heat dissipation method of closed optical machines can only be to transfer heat to the radiator through the internal circulation flow field, then conduct it to the outside through the radiator, and finally the heat is taken away by the external flow field. Therefore, the size of the internal circulation air volume of the optical machine is the key to heat dissipation. In order to ensure the compactness and beauty of the optical machine structure, the heat dissipation device needs to be arranged around the optical components and the space occupied should be as small as possible. In this case, if you want to ensure the air volume, you must have a reasonable air duct design. In particular, in high-brightness models, due to the limitation of structural space, it is impossible to place a large-sized fan, and it is often necessary to place multiple internal circulation fans in different gaps to meet the needs. However, when two fans work in a narrow internal circulation flow field at the same time, if the air duct is not designed properly, on the one hand, the flow field will become extremely chaotic, making it difficult to accurately simulate the internal flow field and increase the difficulty of heat dissipation design; on the other hand, the two fans often do negative work on each other locally, increase the fan impedance, increase noise and reduce air volume. Summary of the invention

[0005] Based on this, the purpose of the present invention is to overcome the deficiencies of the prior art and provide an LCD projector with internal circulation dual fans connected in series for heat dissipation.

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

[0007] An LCD projector with internal circulation dual fans connected in series for heat dissipation, comprising: a projection housing and a closed optical machine installed in the projection housing, wherein heat dissipation holes are arranged at multiple locations of the projection housing, and the closed optical machine comprises: an optical machine housing, an internal circulation fan unit, a heat dissipation module and an external circulation fan unit;

[0008] The optical machine housing comprises a top shell, a middle shell and a bottom shell connected in sequence from top to bottom, the top shell and the middle shell together enclose a first accommodating cavity, the bottom shell and the bottom of the middle shell together enclose a second accommodating cavity, the bottom of the middle shell is provided with a first vent and a second vent that pass through from top to bottom, and 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 which are sequentially arranged along the optical axis direction; the partition, the first lens, the LCD screen, and the second lens jointly divide the first accommodation cavity into a first heat dissipation air duct, a second heat dissipation air duct, a middle air passage cavity, a side air passage cavity, a side heat exchange cavity, and a top heat exchange cavity; the first heat dissipation air duct and the second heat dissipation air duct are respectively located at opposite sides of the LCD screen; the first heat dissipation air duct is located between the LCD screen and the first lens; the second heat dissipation air duct is located between the LCD screen and the second lens; the middle air passage cavity is located at a side of the second lens facing away from the LCD screen; the side heat exchange cavity and the side air passage cavity are located at the side of the middle air passage cavity; and the top heat exchange cavity is located at the top of the middle air passage cavity;

[0010] The first end of the first heat dissipation duct, the top heat exchange cavity, the side air passage cavity, the second heat dissipation duct, the side heat exchange cavity, the middle air passage cavity, the second vent, the second accommodating cavity, the first vent and the second end of the first heat dissipation duct are connected in sequence to form an internal circulation heat dissipation channel;

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

[0012] The heat dissipation module includes a first heat sink and a second heat sink, the first heat sink includes a first cold end and a first hot end connected to conduct heat, the second heat sink includes a second cold end and a second hot end connected to conduct heat, the first cold end is arranged in the top heat exchange cavity, the second cold end is arranged in the side heat exchange cavity, and the first hot end and the second hot end are both arranged outside the optical machine housing;

[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 first hot end, the second external circulation fan is used to dissipate heat to the second hot end, and the third external circulation fan is used to dissipate heat to an electric control panel arranged outside the optical machine housing.

[0014] As an embodiment, the first hot end and the first external circulation fan are both set in two, the two first hot ends are symmetrically arranged relative to the optical axis direction, the two first external circulation fans are also symmetrically arranged relative to the optical axis direction, and each first external circulation fan acts on one of the first hot ends.

[0015] As an embodiment, the enclosed optical machine also includes a light source module, the light source module 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.

[0016] As an embodiment, the enclosed optical machine also includes an LED radiator, the LED radiator includes a third cold end and a third hot end connected to conduct heat, the third cold end is in contact with the LED light source, the light funnel shell is formed with an installation cavity, the first external circulation fan and the third hot end are both installed in the installation cavity, and the first external circulation fan is also used to dissipate heat from the third hot end.

[0017] As an implementation manner, the number of the third hot ends is two and they correspond one to one with the first external circulation fans.

[0018] As an embodiment, the second hot end is arranged adjacent to one of the first hot ends, the airflow exhausted by the second external circulation fan passes through the second hot end and one of the first hot ends in sequence and is then sucked into one of the first external circulation fans, and the airflow exhausted by the third external circulation fan passes through the electric control board and another of the first hot ends in sequence and is then sucked into another of the first external circulation fans.

[0019] As an implementation manner, the imaging module further includes heat-insulating glass located in the first heat dissipation duct.

[0020] As an implementation manner, the first internal circulation fan, the second internal circulation fan and the third external circulation fan are all vortex fans.

[0021] As an implementation manner, a mounting opening is provided on the top shell for mounting and fixing the first cold end.

[0022] As an implementation manner, the first external circulation fan and the second external circulation fan are both axial flow fans.

[0023] The enclosed optical machine of the LCD projector of the present application obtains a more spatially reasonable internal circulation heat dissipation channel by designing the positions of the heat dissipation channel, each fan and the radiator, and connects the first internal circulation fan and the second internal circulation fan in series, so that the airflow circulation of the internal circulation heat dissipation channel is faster, with the advantage of large air volume, so that the flow field of the internal circulation heat dissipation channel becomes relatively orderly, convenient and accurate simulation of the flow field, which is conducive to more accurate heat dissipation design, and ultimately improves the heat dissipation efficiency of the enclosed optical machine, reduces the overall power consumption and volume of the enclosed optical machine, and can ensure that the enclosed optical machine can operate safely and stably. The present application uses the ingenious coordination of the internal circulation heat dissipation channel and the heat dissipation module to allow the airflow to exchange heat with the heat dissipation module twice in one cycle, significantly improving the heat exchange efficiency of the internal circulation heat dissipation channel. In one cycle, the air undergoes the first heat absorption and heating, the first heat dissipation and cooling, the second heat absorption and heating, and the second heat dissipation and cooling.

[0024] For better understanding and implementation, 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 an LCD projector in an embodiment of the present application;

[0026] Figure 2 This is a schematic structural diagram of a closed optical machine from one perspective in an embodiment of the present application;

[0027] Figure 3 This is a schematic structural diagram of a closed optical machine from one perspective in an embodiment of the present application;

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

[0029] Figure 5 This is a schematic diagram of the exploded structure of the optical machine housing in the embodiment of the present application;

[0030] Figure 6 A schematic diagram of a part of the structure of a sealed optical machine in an embodiment of the present application;

[0031] Figure 7 A schematic diagram of a portion of the air circulation inside a sealed optical machine in an embodiment of the present application;

[0032] Figure 8 A schematic diagram of a portion of the air circulation inside a sealed optical machine in an embodiment of the present application;

[0033] Fig. 9 A schematic diagram of a portion of the air circulation inside a sealed optical machine in an embodiment of the present application;

[0034] Description of reference numerals:

[0035] 11. Top shell; 12. Middle shell; 121. First vent; 122. Second vent; 13. Bottom shell; 14. First accommodating chamber; 141. First heat dissipation air duct; 142. Second heat dissipation air duct; 143. Middle air passage chamber; 144. Side air passage chamber; 145. Side heat exchange chamber; 146. Top heat exchange chamber; 15. Second accommodating chamber; 16. Partition; 17. Electric control panel; 21. First lens; 22. Heat insulation glass; 23. LCD screen; 24. Second lens; 31. First internal circulation fan; 32. Second internal circulation fan Circulation fan; 41. first radiator; 411. first cold end; 412. first hot end; 42. second radiator; 421. second cold end; 422. second hot end; 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. mounting cavity; 64. LED radiator; 641. third cold end; 642. third hot end; 71. reflector; 72. projection lens; 8. projection shell; 81. heat dissipation hole. DETAILED DESCRIPTION

[0036] 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.

[0037] In the description of the present invention, it is necessary to understand 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] See also Figures 2 to 9 This embodiment provides an LCD projector with internal circulation dual fans connected in series for heat dissipation, which includes a projection housing and a closed optical engine installed in the projection housing, wherein the projection housing is provided with heat dissipation holes at multiple locations for the closed optical engine to carry out external circulation heat dissipation air flow, wherein the closed optical engine includes an optical engine housing, an internal circulation fan unit, a heat dissipation module and an external circulation fan unit.

[0039] The optical machine housing includes a top shell 11, a middle shell 12 and a bottom shell 13 connected in sequence from top to bottom, the top shell 11 and the middle shell 12 together enclose a first accommodating cavity 14, the bottom shell 13 and the bottom of the middle shell 12 together enclose a second accommodating cavity 15, the bottom of the middle shell 12 is provided with a first ventilation opening 121 and a second ventilation opening 122 that pass through from top to bottom, and a partition 16 and an imaging module are provided in the first accommodating cavity 14. The top shell 11 is a plate-like structure, the middle shell 12 and the bottom shell 13 are both basin-like structures that are open upwards, the top shell 11 covers the opening of the middle shell 12 to enclose the first accommodating cavity 14 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 accommodating cavity 15 together.

[0040] The imaging module includes a first lens 21, an LCD screen 23, and a second lens 24 arranged in sequence along the optical axis, 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 plate and an LCD mounting bracket and other structures, as long as they can achieve a separation effect. The partition 16, the first lens 21, the LCD screen 23, and the second lens 24 jointly divide the first accommodating chamber 14 into a first heat dissipation duct 141, a second heat dissipation duct 142, a middle air passage chamber 143, a side air passage chamber 144, a side heat exchange chamber 145, and a top heat exchange chamber 146. The first heat dissipation duct 141 and the second heat dissipation duct 142 are respectively located on opposite sides of the LCD screen 23. The first heat dissipation duct 141 and the second heat dissipation duct 142 have opposite first and second ends. In this embodiment, the airflow in the first heat dissipation duct 141 flows in a vertical direction, and the airflow in the second heat dissipation duct 142 flows in a horizontal direction. Therefore, the first end of the first heat dissipation duct 141 is the top end, and the second end is the bottom end. The first end of the second heat dissipation duct 142 is the left end, and the second end is the right end. The middle air passage cavity 143 is located on the side of the second lens 24 facing away from the LCD screen 23. The side heat exchange cavity 145 and the side air passage cavity 144 are located on the side of the middle air passage cavity 143. The top heat exchange cavity 146 is located on the top of the middle air passage cavity 143.

[0041] Among them, the first end of the first heat dissipation air duct 141, the top heat exchange cavity 146, the side air passage cavity 144, the second heat dissipation air duct 142, the side heat exchange cavity 145, the middle air passage cavity 143, the second vent 122, the second accommodating cavity 15, the first vent 121 and the second end of the first heat dissipation air duct 141 are connected in sequence to form an internal circulation heat dissipation channel. The airflow can circulate along the internal circulation heat dissipation channel under the drive of the internal circulation fan unit, thereby achieving effective heat dissipation of the LCD screen 23. Specifically, 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 side air passage cavity 144, the second internal circulation fan 32 is arranged in the second accommodating cavity 15, and the first internal circulation fan 31 and the second internal circulation fan 32 cooperate to continuously drive the airflow to circulate in the internal circulation heat dissipation channel. Through the above arrangement, when the airflow continuously circulates in the internal circulation heat dissipation channel, the airflow passes through the first heat dissipation duct 141 and the second heat dissipation duct 142 formed on the opposite sides of the LCD screen 23, thereby effectively dissipating the heat on the opposite sides of the LCD screen 23 and greatly improving the heat dissipation efficiency.

[0042] The heat dissipation module includes a first heat sink 41 and a second heat sink 42. The first heat sink 41 includes a first cold end 411 and a first hot end 412 connected to conduct heat. The second heat sink 42 includes a second cold end 421 and a second hot end 422 connected to conduct heat. The first cold end 411 is arranged in the top heat exchange cavity 146, and the second cold end 421 is arranged in the side heat exchange cavity 145. The first hot end 412 and the second hot end 422 are both arranged outside the optical machine housing. The first cold end 411 and the second cold end 421 can provide a cold source for the internal circulation heat dissipation channel to achieve efficient heat dissipation. When the airflow flows through the top heat exchange cavity 146 and the side heat exchange cavity 145, its temperature can be effectively reduced. The top shell 11 of this embodiment is provided with a mounting port for the first cold end 411 to be installed and fixed, so that the first cold end 411 can be located in the top heat exchange cavity 146.

[0043] The external circulation fan unit is arranged outside the optical machine housing, and 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 to the first hot end 412, the second external circulation fan 52 is used to dissipate heat to the second hot end 422, and the third external circulation fan 53 is used to dissipate heat to the electric control board 17 arranged outside the optical machine housing. The electric control board 17 can be electrically connected to the LCD screen 23 to control the content displayed on the LCD screen 23. The external circulation fan unit dissipates heat to the first hot end 412 and the second hot end 422 outside the optical machine housing, so that the first cold end 411 and the second cold end 421 can be kept in a relatively low temperature state, which is conducive to improving the heat dissipation efficiency.

[0044] Understandably, please also refer to Figure 6-9 ,in Figure 6-9 The black arrow in the figure is the air circulation trajectory of the inner circulation heat dissipation channel. When the closed optical machine is working, the first inner circulation fan 31 and the second inner circulation fan 32 are started to drive the air circulation flow of the inner circulation heat dissipation channel. Figure 7 As shown, when air is discharged from the air outlet of the first internal circulation fan 31, the air enters the second heat dissipation duct 142 from the first end of the second heat dissipation duct 142 and takes away the heat of the LCD screen 23 and the second lens 24 (the air temperature rises at this time), and then flows into the side heat exchange cavity 145 from the second end of the second heat dissipation duct 142, and the heat is firstly discharged by the second cold end 421 (the air temperature drops at this time), and then enters the middle air passage cavity 143 and is sucked into the second internal circulation fan 32 in the second accommodating cavity 15 through the second ventilation port 122, as shown in FIG. Fig. 9 , 8 As shown in Figure 6, the air is then discharged from the first vent 121 by the second internal circulation fan 32, and the air enters the first heat dissipation duct 141 from the second end of the first heat dissipation duct 141 to take away the heat of the LCD screen 23 and the first lens 21 (the air temperature rises again at this time), and then flows into the top heat exchange cavity 146 from the first end of the first heat dissipation duct 141, and the heat is discharged for the second time by using the first cold end 411 (the air temperature drops again at this time), and finally enters the side air cavity 144 and is sucked in by the first internal circulation fan 31, and circulates again according to the above process.

[0045] As can be seen from the above, the enclosed optical machine of the LCD projector of the present application obtains a more spatially reasonable internal circulation heat dissipation channel by designing the positions of the heat dissipation channel, each fan and the radiator. The air volume of a single cycle is accelerated and utilized twice by the first internal circulation fan and the second internal circulation fan connected in series, which can increase the wind pressure and air volume of the cycle, and the air flow circulation in the internal circulation heat dissipation channel is faster. The structure of the internal circulation heat dissipation channel and the reasonable design of the fan position make the flow field of the internal circulation heat dissipation channel relatively orderly, which is convenient and accurate to simulate the flow field, and is conducive to more accurate heat dissipation design, and finally improves the heat dissipation efficiency of the enclosed optical machine, reduces the overall power consumption and volume of the enclosed optical machine, and can ensure that the enclosed optical machine can operate safely and stably. The present application uses the ingenious cooperation of the internal circulation heat dissipation channel and the heat dissipation module to allow the airflow to exchange heat with the heat dissipation module twice in one cycle, which significantly improves the heat exchange efficiency of the internal circulation heat dissipation channel. In one cycle, the air undergoes the first heat absorption and heating, the first heat dissipation and cooling, the second heat absorption and heating, and the second heat dissipation and cooling.

[0046] Specifically, in this embodiment, the first heat dissipation duct 141 is located between the LCD screen 23 and the first lens 21, and the second heat dissipation duct 142 is located between the LCD screen 23 and the second lens 24. Since the middle air passage cavity 143 is located on the side of the second lens 24 facing away from the LCD screen 23, the second heat dissipation duct 142 arranged in this way can be closer to the middle air passage cavity 143, so that the airflow from the second heat dissipation duct 142 can flow into the middle air passage cavity 143 more quickly after passing through the side heat exchange cavity 145, and is sucked into the second accommodating cavity 15 by the second internal circulation fan 32 through the second ventilation port 122. It can be seen that such an arrangement makes the overall layout more reasonable and the heat dissipation efficiency higher.

[0047] The first hot end 412 and the first external circulation fan 51 are both provided in two numbers, and the two first hot ends 412 are symmetrically arranged relative to the optical axis direction, and the two first external circulation fans 51 are also symmetrically arranged relative to the optical axis direction, and each first external circulation fan 51 acts on one first hot end 412. By using two first hot ends 412 to exchange heat with the outside air, and one first hot end 412 to dissipate heat by one first external circulation fan 51, the temperature of the first cold end 411 can be effectively reduced, thereby improving the heat dissipation efficiency. In addition, the symmetrical arrangement of the first hot end 412 can improve the symmetry of the overall structure, so as to improve the space utilization rate.

[0048] 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 62 shell, an opening is provided on the side wall of the middle shell 12 corresponding to the LCD screen 23, the light funnel 62 shell is installed at the opening, the light funnel 62 is arranged in the light funnel 62 shell, 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 located in the first heat dissipation air duct 141. 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 air 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.

[0049] Preferably, the enclosed optical machine of this embodiment further includes an LED heat sink 64, wherein the LED heat sink 64 includes a third cold end 641 and a third hot end 642 connected to conduct heat, wherein the third cold end 641 is fitted with the LED light source 61 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 housing of the light funnel 62 is formed with an installation cavity 631, wherein the first external circulation fan 51 and the third hot end 642 are both installed in the installation cavity 631, and the first external circulation fan 51 is also used to dissipate heat for the third hot end 642. Thus, the utilization rate of the first external circulation fan 51 can be improved and its performance can be fully utilized. Among them, the first hot end 412 and the third hot end 642 are respectively located on opposite sides of the first external circulation fan 51. Thus, when the first external circulation fan 51 is working, air can be driven to flow through the first hot end 412 and the third hot end 642, while dissipating heat for both.

[0050] Specifically, in this embodiment, two third hot ends 642 are provided, and correspond one to one with the first external circulation fans 51 , which can improve the heat dissipation efficiency and the symmetry of the overall structure, so as to improve the space utilization.

[0051] In this embodiment, the first cold end 411 and the first hot end 412 are connected by a heat pipe to conduct heat, the second cold end 421 and the second hot end 422 are integrally arranged to conduct heat, and the third cold end 641 and the third hot end 642 are also connected by a heat pipe to conduct heat. The first cold end 411, the first hot end 412, the second cold end 421, the second hot end 422, the third cold end 641 and the third hot end 642 are all structures composed of a plurality of heat dissipation fins arranged at intervals.

[0052] Preferably, the second hot end 422 is disposed adjacent to one of the first hot ends 412, and the airflow exhausted by the second external circulation fan 52 passes through the second hot end 422 and one of the first hot ends 412 in sequence before being sucked into one of the first external circulation fans 51, and the airflow exhausted by the third external circulation fan 53 passes through the electric control board 17 and another of the first hot ends 412 in sequence before being sucked into another of the first external circulation fans 51. With this arrangement, the airflow direction outside the optical machine housing is smooth and reasonable, which can improve the air heat exchange efficiency outside the optical machine housing, thereby improving the heat dissipation efficiency.

[0053] In this embodiment, the first internal circulation fan 31, the second internal circulation fan 32 and the third external circulation fan 53 are all vortex fans. The first external circulation fan 51 and the second external circulation fan 52 are both 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] The LCD projector of this embodiment includes a projection housing 8 and a sealed optical engine of this embodiment installed in the projection housing 8, and the projection housing 8 is provided with heat dissipation holes 81 at multiple locations. The projector using the sealed optical engine of the embodiment of the present invention 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 present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An LCD projector with internal circulation dual fans connected in series for heat dissipation, characterized in that: include: A projection housing and a closed optical machine installed in the projection housing, wherein the projection housing is provided with heat dissipation holes at multiple locations, and the closed optical machine comprises: an optical machine housing, an internal circulation fan unit, a heat dissipation module, and an external circulation fan unit; The optical machine housing comprises a top shell, a middle shell and a bottom shell connected in sequence from top to bottom, the top shell and the middle shell together enclose a first accommodating cavity, the bottom shell and the bottom of the middle shell together enclose a second accommodating cavity, the bottom of the middle shell is provided with a first vent and a second vent that pass through from top to bottom, and 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 which are sequentially arranged along the optical axis direction; the partition, the first lens, the LCD screen, and the second lens jointly divide the first accommodation cavity into a first heat dissipation air duct, a second heat dissipation air duct, a middle air passage cavity, a side air passage cavity, a side heat exchange cavity, and a top heat exchange cavity; the first heat dissipation air duct and the second heat dissipation air duct are respectively located at opposite sides of the LCD screen; the first heat dissipation air duct is located between the LCD screen and the first lens; the second heat dissipation air duct is located between the LCD screen and the second lens; the middle air passage cavity is located at a side of the second lens facing away from the LCD screen; the side heat exchange cavity and the side air passage cavity are located at the side of the middle air passage cavity; and the top heat exchange cavity is located at the top of the middle air passage cavity; The first end of the first heat dissipation duct, the top heat exchange cavity, the side air passage cavity, the second heat dissipation duct, the side heat exchange cavity, the middle air passage cavity, the second vent, the second accommodating cavity, the first vent and the second end of the first heat dissipation duct are connected in sequence to form an internal circulation heat dissipation channel; The internal circulation fan unit includes a first internal circulation fan and a second internal circulation fan, wherein the first internal circulation fan is arranged in the side air passage cavity, and the second internal circulation fan is arranged in the second accommodating cavity; The heat dissipation module includes a first heat sink and a second heat sink, the first heat sink includes a first cold end and a first hot end connected to conduct heat, the second heat sink includes a second cold end and a second hot end connected to conduct heat, the first cold end is arranged in the top heat exchange cavity, the second cold end is arranged in the side heat exchange cavity, and the first hot end and the second hot end are both arranged outside the optical machine housing; 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 first hot end, the second external circulation fan is used to dissipate heat to the second hot end, and the third external circulation fan is used to dissipate heat to an electric control panel arranged outside the optical machine housing.

2. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to claim 1, characterized in that: The first hot end and the first external circulation fan are both set in two, the two first hot ends are symmetrically arranged relative to the optical axis direction, the two first external circulation fans are also symmetrically arranged relative to the optical axis direction, and each first external circulation fan acts on one first hot end.

3. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to claim 2, characterized in that: 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.

4. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to claim 3 is characterized in that: The enclosed optical machine also includes an LED radiator, which includes a third cold end and a third hot end connected to each other to conduct heat. The third cold end is in contact with the LED light source. The light funnel shell forms an installation cavity. The first external circulation fan and the third hot end are both installed in the installation cavity. The first external circulation fan is also used to dissipate heat from the third hot end.

5. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to claim 4, characterized in that: The number of the third hot ends is two and they correspond one to one with the first external circulation fans.

6. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to claim 2, characterized in that: The second hot end is arranged adjacent to one of the first hot ends, and the airflow exhausted by the second external circulation fan passes through the second hot end and one of the first hot ends in sequence and is then sucked into one of the first external circulation fans, and the airflow exhausted by the third external circulation fan passes through the electric control board and another of the first hot ends in sequence and is then sucked into another of the first external circulation fans.

7. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to claim 1, characterized in that: The imaging module further includes a heat-insulating glass located in the first heat dissipation duct.

8. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to any one of claims 1 to 7, characterized in that: The first internal circulation fan, the second internal circulation fan and the third external circulation fan are all vortex fans.

9. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to claim 8, characterized in that: The top shell is provided with a mounting opening for the first cold end to be mounted and fixed.

10. The LCD projector with internal circulation dual fans connected in series for heat dissipation according to claim 9, characterized in that: The first external circulation fan and the second external circulation fan are both axial flow fans.

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