An LCD projector with internal circulation and dual fans in series for heat dissipation

Abstract

The present invention relates to an LCD projector with internal circulation dual fans connected in series for heat dissipation, comprising: a projection housing and a sealed optical engine installed in the projection housing, the sealed optical engine comprising: an optical engine housing, an internal circulation fan unit, a heat dissipation module, and an external circulation fan unit; a first end of a first heat dissipation duct in the sealed optical engine, a top heat exchange chamber, a side air passage chamber, a second heat dissipation duct, a side heat exchange chamber, a middle air passage chamber, a second vent, a second accommodating chamber, the first vent, and the second end of the first heat dissipation duct are sequentially connected to form an internal circulation heat dissipation channel. 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 a 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, thereby increasing the wind pressure and air volume, and making the flow field of the internal circulation heat dissipation channel relatively orderly, facilitating and accurately simulating the flow field, and facilitating more accurate heat dissipation design.

Description

Technical Field

[0001] The present invention relates to the technical field of LCD projectors, in particular to an LCD projector with internal circulation and 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 effectively prevent dust and contaminants from entering the optical path, significantly reducing the impact of dust on LCD screens. This allows projection equipment to be more adaptable to a wider range of applications and significantly extends its lifespan. However, this enclosed environment poses significant challenges to dissipating heat from the optical components within the optical engine. Efficiently dissipating internal heat without disrupting the enclosed space is currently a key focus of optical engine cooling.

[0004] Currently, enclosed optical engines dissipate heat only through an internal circulation flow field, transferring heat to a heat sink. This heat is then conducted to the outside through the heat sink, and finally removed by the external flow field. Therefore, the internal circulation air volume of the optical engine is crucial for heat dissipation. To ensure the compactness and aesthetics of the optical engine structure, the heat sink must be arranged around the optical components and occupy as little space as possible. In this case, ensuring air volume requires a reasonable air duct design. In particular, in high-brightness models, due to structural space constraints, a large fan cannot be placed. Multiple internal circulation fans are often placed in different gaps to meet the requirements. However, when two fans operate simultaneously in a confined internal circulation flow field, if the air duct design is not appropriate, the flow field will become extremely chaotic, making it difficult to accurately simulate the internal flow field and increasing the difficulty of heat dissipation design. Secondly, the two fans will often locally perform negative work on each other, increasing fan impedance, increasing noise and reducing 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 sealed optical engine installed in the projection housing, wherein the projection housing is provided with heat dissipation holes at multiple locations, and the sealed optical engine comprises: an optical engine housing, an internal circulation fan unit, a heat dissipation module, and an external circulation fan unit;

[0008] The optical machine housing includes 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, and 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 ventilation opening and a second ventilation opening extending vertically therethrough. A partition and an imaging module are provided in the first accommodating cavity.

[0009] The imaging module includes a first lens, an LCD screen, and a second lens arranged in sequence along the optical axis. The partition, the first lens, the LCD screen, and the second lens jointly divide the first accommodating chamber into a first heat dissipation duct, a second heat dissipation duct, a central air passage chamber, a side air passage chamber, a side heat exchange chamber, and a top heat exchange chamber. The first heat dissipation duct and the second heat dissipation duct are respectively located on opposite sides of the LCD screen. The first heat dissipation duct is located between the LCD screen and the first lens. The second heat dissipation duct is located between the LCD screen and the second lens. The central air passage chamber is located on a side of the second lens facing away from the LCD screen. The side heat exchange chamber and the side air passage chamber are located on the sides of the central air passage chamber. The top heat exchange chamber is located on the top of the central air passage chamber.

[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, 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 the electronic control board arranged outside the optical machine housing.

[0014] As an embodiment, the first hot end and the first external circulation fan are both set to two, the two first hot ends are symmetrically arranged relative to the optical axis direction, and 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.

[0015] As an embodiment, the enclosed optical machine also includes a light source module, which includes an LED light source, a light funnel and a light funnel shell. An opening is provided on the middle shell corresponding to the side wall of the LCD screen. The light funnel shell is installed at the opening. The light funnel is arranged in the light funnel shell. The light outlet of the light funnel faces the LCD screen, and the light inlet of the light funnel is arranged at the LED light source.

[0016] As an embodiment, 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, and the third cold end is in contact with the LED light source. The light funnel shell is formed with an installation cavity, and 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.

[0017] As an embodiment, 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, 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.

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

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

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

[0022] As an embodiment, 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 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 ensures that the enclosed optical machine can operate safely and stably. The present application cleverly cooperates the internal circulation heat dissipation channel and the heat dissipation module, so that the airflow can 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.

[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 structural diagram of an LCD projector in an embodiment of the present application;

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

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

[0028] Figure 4 This is a schematic diagram of the exploded structure of the sealed optical engine 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 an embodiment of the present application;

[0030] Figure 6 This is a schematic structural diagram of a portion of the structure of a sealed optical engine in an embodiment of the present application;

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

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

[0033] Figure 9 A schematic diagram of a portion of the air circulation inside the sealed optical engine 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 cooling air duct; 142. Second cooling air duct; 143. Middle air passage; 144. Side air passage; 145. Side heat exchange chamber; 146. Top heat exchange chamber; 15. Second accommodating chamber; 16. Partition; 17. Electric control panel; 21. First lens; 22. Insulating 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 various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0038] See also Figures 2 to 9 This embodiment provides an LCD projector with internal circulation dual fans in series for heat dissipation, which includes a projection housing and a closed optical engine installed in the projection housing. 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, which are connected in sequence from top to bottom. The top shell 11 and the middle shell 12 together enclose a first accommodating cavity 14, and 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 extending vertically therethrough. A partition 16 and an imaging module are provided within the first accommodating cavity 14. The top shell 11 is a plate-like structure, and the middle shell 12 and bottom shell 13 are both upwardly open basin-like structures. 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. The opening of the bottom shell 13 abuts the bottom of the middle shell 12 to enclose the second accommodating cavity 15.

[0040] The imaging module includes a first lens 21, an LCD screen 23, and a second lens 24, arranged sequentially along the optical axis. The first lens 21 is a rear Fresnel lens, and the second lens 24 is a front Fresnel lens. The partition 16 may include a partition plate, an LCD mounting bracket, or other structures, as long as they provide a partitioning effect. The partition 16, the first lens 21, the LCD screen 23, and the second lens 24 collectively divide the first accommodating chamber 14 into a first heat dissipation duct 141, a second heat dissipation duct 142, a central airflow chamber 143, a side airflow chamber 144, a side heat exchange chamber 145, and a top heat exchange chamber 146. The first and second heat dissipation ducts 141, 142 are located on opposite sides of the LCD screen 23. Each of the first and second heat dissipation ducts 141, 142 has a first and second opposite end. In this embodiment, the airflow in the first heat dissipation duct 141 flows vertically, while the airflow in the second heat dissipation duct 142 flows horizontally. 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 central air passage 143 is located on the side of the second lens 24 facing away from the LCD screen 23. The side heat exchange ducts 145 and 144 are located on the sides of the central air passage 143. The top heat exchange duct 146 is located at the top of the central air passage 143.

[0041] The first end of the first heat dissipation duct 141, the top heat exchange cavity 146, the side air flow cavity 144, the second heat dissipation duct 142, the side heat exchange cavity 145, the middle air flow cavity 143, the second vent 122, the second accommodating cavity 15, the first vent 121, and the second end of the first heat dissipation duct 141 are sequentially connected to form an internal circulation heat dissipation channel. Driven by the internal circulation fan unit, airflow circulates along the internal circulation heat dissipation channel, thereby effectively dissipating heat from 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 disposed in the side air flow cavity 144, and the second internal circulation fan 32 is disposed in the second accommodating cavity 15. The first internal circulation fan 31 and the second internal circulation fan 32 cooperate to continuously drive airflow to circulate within the internal circulation heat dissipation channel. Through the above arrangement, when the air flow continuously circulates in the internal circulation heat dissipation channel, the air flow 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, 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 disposed in the top heat exchange cavity 146, and the second cold end 421 is disposed in the side heat exchange cavity 145. The first hot end 412 and the second hot end 422 are both disposed 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, achieving 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. In this embodiment, a mounting port is provided on the top shell 11 for mounting and fixing the first cold end 411, so that the first cold end 411 can be located within the top heat exchange cavity 146.

[0043] The external circulation fan unit is disposed outside the optical engine 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 from the first hot end 412, the second external circulation fan 52 is used to dissipate heat from the second hot end 422, and the third external circulation fan 53 is used to dissipate heat from the electronic control board 17 disposed outside the optical engine housing. The electronic 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 from the first hot end 412 and the second hot end 422 outside the optical engine housing, allowing the first cold end 411 and the second cold end 421 to remain at a relatively low temperature, thereby improving 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 internal circulation heat dissipation channel. When the closed optical engine is working, the first internal circulation fan 31 and the second internal circulation fan 32 are started to drive the air circulation flow in the internal 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 uses the second cold end 421 to conduct the heat for the first time (the air temperature drops at this time), and then enters the middle air cavity 143 and passes through the second ventilation port 122 and is sucked into the second internal circulation fan 32 in the second accommodating cavity 15, as shown in FIG. Figure 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 extracted 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] From the above, it can be seen that the enclosed optical machine of the LCD projector of the present application has obtained a more spatially reasonable internal circulation heat dissipation channel by designing the position of the heat dissipation channel, each fan and 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. In addition, 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, convenient and accurate simulation of the flow field, which is conducive to more accurate heat dissipation design, and ultimately improve the heat dissipation efficiency of the enclosed optical machine, reduce the overall power consumption and volume of the enclosed optical machine, and ensure that the enclosed optical machine can operate safely and stably. The present application uses the ingenious combination 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.

[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. Because the central air passage 143 is located on the side of the second lens 24 facing away from the LCD screen 23, this arrangement allows the second heat dissipation duct 142 to be closer to the central air passage 143. As a result, air from the second heat dissipation duct 142 can flow more quickly into the central air passage 143 after passing through the side heat exchange cavity 145. Air is then drawn into the second accommodating chamber 15 by the second internal circulation fan 32 through the second vent 122. This arrangement results in a more rational overall layout and higher heat dissipation efficiency.

[0047] Two first hot ends 412 and two first external circulation fans 51 are provided. The two first hot ends 412 are symmetrically arranged relative to the optical axis, and the two first external circulation fans 51 are also symmetrically arranged relative to the optical axis. Each first external circulation fan 51 acts on a corresponding first hot end 412. By using two first hot ends 412 to exchange heat with the outside air, and dissipating heat from one first hot end 412 by one first external circulation fan 51, the temperature of the first cold end 411 can be effectively reduced, thereby improving heat dissipation efficiency. Furthermore, the symmetrical arrangement of the first hot ends 412 enhances the symmetry of the overall structure, thereby improving space utilization.

[0048] Preferably, the enclosed optical machine of this embodiment further includes a light source module, comprising an LED light source 61, a light funnel 62, and a light funnel 62 housing. An opening is provided on the side wall of the middle shell 12 corresponding to the LCD screen 23, and the light funnel 62 housing is installed at the opening. The light funnel 62 is disposed within the light funnel 62 housing, with the light outlet of the light funnel 62 facing the LCD screen 23, and the light inlet of the light funnel 62 disposed at the LED light source 61. The imaging module further includes insulating glass 22 located within the first heat dissipation duct 141. The enclosed optical machine further includes a projection module, comprising a reflector 71 and a projection lens 72. The reflector 71 is disposed within the central air passage 143 to reflect light emitted from the second lens 24 toward the projection lens 72. The light emitted by the LED light source 61 passes through the light funnel 62, the first lens 21, the heat-insulating glass 22, the LCD screen 23, the second lens 24 and the reflector 71 in sequence, and then is emitted from the projection lens 72 to form a projection image.

[0049] Preferably, the enclosed light engine of this embodiment further includes an LED heat sink 64, comprising a third cold end 641 and a third hot end 642, which are connected to conduct heat. The third cold end 641 is in contact with the LED light source 61 to dissipate heat from the LED light source 61, effectively ensuring the normal operation of the LED light source 61 and extending its service life. The housing of the light funnel 62 defines a mounting cavity 631, into which the first external circulation fan 51 and the third hot end 642 are mounted. The first external circulation fan 51 also dissipates heat from the third hot end 642. This improves the utilization rate of the first external circulation fan 51 and maximizes its performance. The first hot end 412 and the third hot end 642 are located on opposite sides of the first external circulation fan 51. Therefore, when the first external circulation fan 51 is in operation, it can drive air through the first hot end 412 and the third hot end 642, dissipating heat from 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, thereby improving 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 provided 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 all employ a structure consisting of a plurality of heat sink fins arranged in an intermittent manner.

[0052] Preferably, the second hot end 422 is disposed adjacent to one of the first hot ends 412. The airflow exhausted by the second external circulation fan 52 sequentially passes through the second hot end 422 and one of the first hot ends 412 before being drawn into one of the first external circulation fans 51. The airflow exhausted by the third external circulation fan 53 sequentially passes through the electronic control board 17 and another of the first hot ends 412 before being drawn into another of the first external circulation fans 51. This arrangement ensures a smooth and reasonable airflow direction outside the optical machine housing, improving the heat exchange efficiency of the air outside the optical machine housing, thereby improving 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, which helps to make 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 mounted within the projection housing 8. The projection housing 8 is provided with heat dissipation holes 81 at multiple locations. A projector employing the sealed optical engine of this embodiment of the present invention facilitates a compact design, provides excellent heat dissipation, and has a high sealing performance.

[0055] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that variations and improvements are possible without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection 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 sealed optical engine installed in the projection housing, wherein the projection housing is provided with heat dissipation holes at multiple locations, and the sealed optical engine comprises: an optical engine housing, an internal circulation fan unit, a heat dissipation module, and an external circulation fan unit; The optical machine housing includes 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, and 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 ventilation opening and a second ventilation opening extending vertically therethrough. A partition and an imaging module are provided in the first accommodating cavity. The imaging module includes a first lens, an LCD screen, and a second lens arranged in sequence along the optical axis. The partition, the first lens, the LCD screen, and the second lens jointly divide the first accommodating chamber into a first heat dissipation duct, a second heat dissipation duct, a central air passage chamber, a side air passage chamber, a side heat exchange chamber, and a top heat exchange chamber. The first heat dissipation duct and the second heat dissipation duct are respectively located on opposite sides of the LCD screen. The first heat dissipation duct is located between the LCD screen and the first lens. The second heat dissipation duct is located between the LCD screen and the second lens. The central air passage chamber is located on a side of the second lens facing away from the LCD screen. The side heat exchange chamber and the side air passage chamber are located on the sides of the central air passage chamber. The top heat exchange chamber is located on the top of the central air passage chamber. 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, 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 the electronic control board 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, and 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, 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 is formed with 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 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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