Closed ray machine with uniform heat dissipation and LCD projector

Abstract

The utility model relates to a sealed light machine with uniform heat dissipation and an LCD projector. The sealed light machine comprises a housing, an optical device, a heat dissipation module, an internal circulation fan and a first external heat dissipation fan. The optical device comprises an LCD screen; the heat dissipation module comprises a hot-end radiator and a cold-end radiator which are connected with each other, the cold-end radiator comprises a plurality of first heat dissipation fins which are sequentially arranged at intervals in the first horizontal direction, a gap between every two adjacent first heat dissipation fins extends in the second horizontal direction perpendicular to the first horizontal direction, and the inner circulation fan is a vortex fan; the cold end radiator is located at an air outlet of the internal circulation fan, and the center line of the air outlet of the internal circulation fan is parallel to the horizontal plane and forms an included angle with the second horizontal direction. According to the closed optical machine provided by the embodiment of the invention, the positions of the internal circulating fan and the cold end radiator are adjusted, so that compared with the prior art, the air can be more uniform when flowing through the LCD screen, and more uniform heat dissipation can be performed on the LCD screen.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of LCD projector, especially airtight light machine of even heat dissipation and LCD projector. BACKGROUND

[0002] The airtight light machine of LCD can effectively prevent dust and pollutants from entering the light path, thereby significantly reducing the influence of dust on the panel, enabling the projection device to be more widely applicable to various use occasions, and also greatly prolonging the service life of the projection device.

[0003] However, the closed environment brings great difficulty to the heat dissipation of the optical elements inside the light machine. Among them, the LCD screen and the polarizer are the key heat dissipation components of the light machine, but due to their particularity, they can only be cooled by heat convection. Therefore, the common heat dissipation method of the airtight light machine at present is to drive air circulation by operating the vortex fan in the internal circulation flow field of the light machine, and the air exchanges heat with the radiator to conduct heat to the outside, and finally the external flow field carries away the heat.

[0004] Among them, the LCD screen is a component with a large amount of heat in the light machine. Due to the unreasonable arrangement of the vortex fan and the radiator in the prior art, and the fact that the air outlet of the vortex fan has a certain angle and is not uniform, it leads to that the air flowing through the LCD screen is not stable, and the heat dissipation efficiency of each position of the LCD screen is inconsistent, which makes the temperature distribution of the LCD screen left and right or up and down uneven, affecting the heat dissipation effect of the LCD screen. SUMMARY

[0005] Therefore, the utility model aims at overcoming the defects of the prior art, and provides an airtight light machine of even heat dissipation and an LCD projector.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0007] An airtight light machine of even heat dissipation comprises:

[0008] A shell, optical devices, a heat dissipation module, an internal circulation fan and a first external heat dissipation fan;

[0009] The shell is internally formed with an upper cavity and a lower cavity arranged in the vertical direction, and the shell is further provided with a first air vent and a second air vent for connecting the upper cavity and the lower cavity, and the lower cavity, the first air vent, the upper cavity and the second air vent are sequentially connected to form an internal circulation air duct;

[0010] The optical devices are arranged in the upper cavity, and the optical devices comprise an LCD screen, and in the vertical direction, the LCD screen is located in the projection of the first air vent;

[0011] The heat dissipation module comprises a hot-end heat sink and a cold-end heat sink connected with each other, the hot-end heat sink is arranged outside the shell, the cold-end heat sink and the internal circulation fan are arranged in the lower cavity, the cold-end heat sink comprises a plurality of first heat dissipation fins arranged in sequence and spaced apart along a first horizontal direction, a gap between adjacent two first heat dissipation fins extends along a second horizontal direction perpendicular to the first horizontal direction, the internal circulation fan is a vortex fan, an air inlet of the internal circulation fan is opposite to the second air vent, the cold-end heat sink is located at an air outlet of the internal circulation fan, a center line of the air outlet of the internal circulation fan is parallel to a horizontal plane and is arranged at an angle with the second horizontal direction;

[0012] The first external heat dissipation fan is arranged outside the shell and is used for cooling the hot-end heat sink.

[0013] As an implementation form, the angle between the center line of the air outlet of the internal circulation fan and the second horizontal direction is a, wherein 150°≤a<175°.

[0014] As an implementation form, the optical device further comprises a first Fresnel lens, heat insulation glass, a second Fresnel lens and a mirror, the first Fresnel lens, the heat insulation glass, the LCD screen, the second Fresnel lens and the mirror are arranged in sequence along a light propagation direction.

[0015] As an implementation form, at least a part of the mirror is located in the second air vent in a vertical direction to divide the second air vent into a first region and a second region, wherein the first region is located on a side of the mirror facing the second Fresnel lens, the second region is located on a side of the mirror facing away from the second Fresnel lens, and the area of the first region is smaller than the area of the second region.

[0016] As an implementation form, a bottom of the mirror is separated from a bottom wall of the upper cavity by a preset distance.

[0017] As an implementation form, the hot-end heat sink and the cold-end heat sink are connected by a heat conduction pipe.

[0018] As an implementation form, the sealed optical machine further comprises a light emitting unit, the light emitting unit comprises an LED light source and a light funnel, the shell is provided with a mounting port corresponding to a side of the first Fresnel lens, a light outlet of the light funnel is connected to the mounting port, and the LED light source is arranged at a light inlet of the light funnel.

[0019] As an implementation form, the sealed optical machine further comprises a light source heat sink and a second external heat dissipation fan, the light source heat sink is used for dissipating heat of the LED light source, and the second external heat dissipation fan is used for cooling the light source heat sink.

[0020] As an implementation, the first external cooling fan and the second external cooling fan are both axial flow fans, and the first external cooling fan, the hot-end heat sink, the second external cooling fan and the light source heat sink are sequentially arranged along the axial direction of the first external cooling fan.

[0021] According to the technical scheme, in the closed light engine, the positions of the internal circulation fan and the cold-end heat sink are adjusted, compared with the prior art, the air is more uniform when flowing through the LCD screen, the LCD screen is more uniformly cooled, and the cooling effect is improved.

[0022] The LCD projector provided by the application comprises a projection shell and the closed light engine with uniform cooling arranged in the projection shell.

[0023] In order to better understand and implement, the application is described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Fig. 1 is a structural schematic diagram of the closed light engine in the embodiment of the application;

[0025] Figure 2 Fig. 2 is a sectional side view structural schematic diagram of the closed light engine in the embodiment of the application;

[0026] Figure 3 Fig. 3 is a sectional top view structural schematic diagram of the closed light engine in the embodiment of the application;

[0027] Figure 4 Fig. 4 is a schematic diagram of the structure of the hidden part at the bottom of the closed light engine in the embodiment of the application;

[0028] Figure 5 Fig. 5 is a structural schematic diagram of the internal circulation fan and the cold-end heat sink in the embodiment of the application;

[0029] Figure 6 Fig. 6 is a structural schematic diagram of the LCD projector in the embodiment of the application;

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1, housing; 11, upper cavity; 12, lower cavity; 13, first vent; 14, second vent; 141, first area; 142, second area; 10, internal circulation air duct; 21, first mirror; 22, heat insulation glass; 23, LCD screen; 24, second mirror; 25, reflector; 31, hot end heat sink; 32, cold end heat sink; 321, first heat dissipation fin; L1, first horizontal direction; L2, second horizontal direction; 4, internal circulation fan; L3, center line; 51, first external heat dissipation fan; 52, second external heat dissipation fan; 61, LED light source; 62, light funnel; 7, light source heat sink; 8, projection housing. DETAILED DESCRIPTION

[0032] To further illustrate the embodiments, the utility model provides drawings. These drawings are part of the utility model disclosure, which mainly serves to illustrate the embodiments, and can be combined with the related description of the specification to explain the operating principle of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementations and the advantages of the utility model.

[0033] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0034] Please refer to Figures 1 to 5 The utility model provides a kind of closed light machine of uniform heat dissipation, it includes housing 1, optical device, heat dissipation module, internal circulation fan 4 and first external heat dissipation fan 51.

[0035] The housing 1 is used to accommodate various components, the housing 1 is internally formed with upper and lower arranged upper cavity 11 and lower cavity 12, the housing 1 is also provided with the first vent 13 and the second vent 14 for connecting the upper cavity 11 and the lower cavity 12, the lower cavity 12, the first vent 13, the upper cavity 11 and the second vent 14 sequentially communicate to form an internal circulation air duct 10. When the internal circulation fan 4 is started, the air in the internal circulation air duct 10 sequentially passes from the lower cavity 12 through the first vent 13 into the upper cavity 11, and then flows back to the lower cavity 12 through the second vent 14.

[0036] The optical device is disposed in the upper cavity 11, and includes an LCD screen 23. Vertically, the LCD screen 23 is located within the projection of the first vent 13. In other words, in this embodiment, the LCD screen 23 is perpendicular to the horizontal plane, and its bottom is located in the first vent 13. This allows air exhausted from the first vent 13 to flow through the opposite sides of the LCD screen 23, effectively dissipating heat.

[0037] The heat dissipation module includes a hot-end heat sink 31 and a cold-end heat sink 32 connected to each other. The hot-end heat sink 31 is disposed outside the housing 1, and the cold-end heat sink 32 and the internal circulation fan 4 are disposed in the lower cavity 12. The cold-end heat sink 32 includes a plurality of first heat dissipation fins 321 arranged at intervals along a first horizontal direction L1. The gap between two adjacent first heat dissipation fins 321 extends along a second horizontal direction L2 perpendicular to the first horizontal direction L1. The internal circulation fan 4 is a vortex fan. The air inlet of the internal circulation fan 4 is directly opposite the second ventilation opening 14. The cold end heat sink 32 is located at the air outlet of the internal circulation fan 4. The centerline L3 of the air outlet of the internal circulation fan 4 is parallel to the horizontal plane and forms an angle with the second horizontal direction L2. That is, the air outlet of the internal circulation fan 4 is deflected at a certain angle so that it is not directly opposite the gap between the multiple first heat dissipation fins 321. The centerline L3 of the air outlet of the internal circulation fan 4 is the normal to the plane in which the air outlet of the internal circulation fan 4 is located. The first external cooling fan 51 is disposed outside the housing 1 and is used to cool the hot end heat sink 31.

[0038] Because the LCD screen 23 generates a high amount of heat, the temperature in the internal circulation duct 10 is also high. When the internal circulation fan 4 is started, the air in the internal circulation duct 10 circulates. The air blown out by the internal circulation fan 4 undergoes heat exchange as it flows through the cold end heat sink 32, thus cooling down into cold air. This cold air then flows through the LCD screen 23 to further cool it, forming a wind-cooled internal circulation that quickly removes the heat generated by the LCD screen 23. Since the cold end heat sink 32 heats up during heat exchange, heat can be conducted to the hot end heat sink 31 located outside the housing 1 by connecting it. The hot end heat sink 31 is then cooled by the first external cooling fan 51, thereby keeping the cold end heat sink 32 at a low temperature. This effectively achieves rapid heat dissipation of the LCD screen 23, ensuring its normal operation and extending its service life.

[0039] In this embodiment, the cold end heat sink 32 is placed at the air outlet of the internal circulation fan 4. The gaps between the first heat dissipation fins 321 form multiple micro air ducts, which can rectify the incoming air. At the same time, by deflecting the air outlet of the internal circulation fan 4 at a certain angle so that it is not directly opposite the gaps between the first heat dissipation fins 321, the rectification effect of the air is better. As a result, when the air discharged through the cold end heat sink 32 flows through the LCD screen 23, it can perform uniform heat exchange on all parts of the LCD screen 23, making the temperature of the LCD screen 23 more uniform and improving the heat dissipation effect.

[0040] As can be seen from the above technical solutions, in the closed optical engine of this application embodiment, by adjusting the positions of the internal circulation fan 4 and the cold end heat sink 32, compared with the prior art, the air can flow more evenly when passing through the LCD screen 23, and the LCD screen 23 can be cooled more evenly, thus improving the heat dissipation effect.

[0041] In this embodiment, the angle between the centerline L3 of the air outlet of the internal circulation fan 4 and the second horizontal direction L2 is α, where 150° ≤ α < 175°. This air outlet angle allows the cold end radiator 32 to achieve better air rectification.

[0042] The optical components also include a first Fresnel lens 21, heat-insulating glass 22, a second Fresnel lens 24, and a reflector 25, which are arranged sequentially along the direction of light propagation. In this embodiment, the direction of light propagation is from the first vent 13 to the second vent 14. The first Fresnel lens 21, heat-insulating glass 22, second Fresnel lens 24, and reflector 25 also generate a certain amount of heat; placing them in the upper cavity 11 helps to cool them down together.

[0043] In this embodiment, when viewed vertically, at least a portion of the reflector 25 is located within the second vent 14, dividing the second vent 14 into a first region 141 and a second region 142. The first region 141 is located on the side of the reflector 25 facing the second Fresnel lens 24, and the second region 142 is located on the side of the reflector 25 facing away from the second Fresnel lens 24. The area of ​​the first region 141 is smaller than the area of ​​the second region 142. In actual testing, the airflow is greater on the side of the reflector 25 facing the second Fresnel mirror 24, while the airflow is smaller on the side of the reflector 25 facing away from the second Fresnel mirror 24. This leads to an imbalance in the overall airflow and uneven heat dissipation. Therefore, in this embodiment, the reflector 25 is used to divide the second vent 14, making the area of ​​the first region 141 smaller than the area of ​​the second region 142. This makes it more difficult for areas with higher airflow to enter the lower cavity 12 through the first region 141, and easier for areas with lower airflow to enter the lower cavity 12 through the second region 142. This balances the airflow on both sides of the reflector 25, making the airflow more uniform.

[0044] Preferably, in this embodiment, the bottom of the reflector 25 is separated from the bottom wall of the upper cavity 11 by a predetermined distance, thereby connecting the two sides of the reflector 25 and reducing the noise of the internal circulation fan 4 during air return.

[0045] Preferably, the hot end heat sink 31 and the cold end heat sink 32 are connected by a heat pipe, which makes their heat exchange efficiency higher.

[0046] Preferably, the sealed optical engine in this embodiment further includes a light-emitting unit, which includes an LED light source 61 and a light funnel 62. The housing 1 has a mounting port on one side corresponding to the first Fresnel lens 21. The light outlet of the light funnel 62 is connected to the mounting port, and the LED light source 61 is positioned at the light inlet of the light funnel 62. The white light emitted by the LED light source 61 is focused by the light funnel 62 and then sequentially enters the first Fresnel lens 21, the heat-insulating glass 22, the LCD screen 23, the second Fresnel lens 24, and the reflector 25 to form image light carrying image information.

[0047] Preferably, the sealed optical engine in this embodiment further includes a light source heat sink 7 and a second external cooling fan 52. The light source heat sink 7 is used to dissipate heat from the LED light source 61, and the second external cooling fan 52 is used to cool the light source heat sink 7.

[0048] Furthermore, in this embodiment, both the first external cooling fan 51 and the second external cooling fan 52 are axial flow fans. The first external cooling fan 51, the hot end heat sink 31, the second external cooling fan 52, and the light source heat sink 7 are arranged sequentially along the axial direction of the first external cooling fan 51. This arrangement connects the first external cooling fan 51 and the second external cooling fan 52 in series, increasing the heat dissipation efficiency.

[0049] In this embodiment, the sealed optical engine is designed with all components neatly and rationally within a compact space, and provides heat dissipation for all heat-generating components. All airflow paths are also rational and efficient. This sealed optical engine can achieve low-cost, high-efficiency, and rational heat dissipation without the use of semiconductor cooling chips and water cooling, ensuring overall safe and stable operation.

[0050] like Figure 6 As shown, this embodiment also provides an LCD projector, which includes a projection housing 8 and a sealed optical engine of this embodiment disposed in the projection housing 8. The LCD projector has the beneficial effects of the sealed optical engine of this embodiment, which will not be described in detail here.

[0051] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A sealed optical engine with uniform heat dissipation, characterized in that, include: Housing, optical components, heat dissipation module, internal circulation fan, and first external heat dissipation fan; The shell has an upper cavity and a lower cavity arranged vertically inside. The shell also has a first vent and a second vent that connect the upper cavity and the lower cavity. The lower cavity, the first vent, the upper cavity and the second vent are connected in sequence to form an internal circulation air duct. The optical device is disposed in the upper cavity, and the optical device includes an LCD screen. In the vertical direction, the LCD screen is located within the projection of the first vent. The heat dissipation module includes a hot-end heat sink and a cold-end heat sink connected to each other. The hot-end heat sink is disposed outside the housing, and the cold-end heat sink and the internal circulation fan are disposed in the lower cavity. The cold-end heat sink includes a plurality of first heat dissipation fins arranged at intervals along a first horizontal direction. The gap between two adjacent first heat dissipation fins extends along a second horizontal direction perpendicular to the first horizontal direction. The internal circulation fan is a vortex fan. The air inlet of the internal circulation fan is directly opposite the second ventilation port. The cold-end heat sink is located at the air outlet of the internal circulation fan. The centerline of the air outlet of the internal circulation fan is parallel to the horizontal plane and is set at an angle to the second horizontal direction. The first external cooling fan is located outside the housing and is used to cool the hot end heat sink.

2. The hermetic optical engine with uniform heat dissipation according to claim 1, characterized in that: The angle between the center line of the air outlet of the internal circulation fan and the second horizontal direction is α, where 150°≤α<175°.

3. The hermetic optical engine with uniform heat dissipation according to claim 2, characterized in that: The optical device also includes a first Fresnel lens, heat-insulating glass, a second Fresnel lens, and a reflector, which are arranged sequentially along the direction of light propagation.

4. The hermetic optical engine with uniform heat dissipation according to claim 3, characterized in that: Viewed vertically, at least a portion of the reflector is located within the second vent, dividing the second vent into a first region and a second region. The first region is located on the side of the reflector facing the second Fresnel lens, and the second region is located on the side of the reflector facing away from the second Fresnel lens. The area of ​​the first region is smaller than the area of ​​the second region.

5. The hermetic optical engine with uniform heat dissipation according to claim 4, characterized in that: The bottom of the reflector is separated from the bottom wall of the upper cavity by a predetermined distance.

6. The hermetic optical engine with uniform heat dissipation according to any one of claims 1-5, characterized in that: The hot-end radiator and the cold-end radiator are connected by heat pipes.

7. The hermetic optical engine with uniform heat dissipation according to claim 3, characterized in that: It also includes a light-emitting unit, which includes an LED light source and a light funnel. The housing has a mounting port on one side corresponding to the first Fresnel lens. The light outlet of the light funnel is connected to the mounting port. The LED light source is located at the light inlet of the light funnel.

8. The hermetic optical engine with uniform heat dissipation according to claim 7, characterized in that: It also includes a light source heat sink and a second external cooling fan. The light source heat sink is used to dissipate heat from the LED light source, and the second external cooling fan is used to cool the light source heat sink.

9. The heat-dissipating, sealed optical engine according to claim 8, characterized in that: Both the first external cooling fan and the second external cooling fan are axial flow fans. The first external cooling fan, the hot end heat sink, the second external cooling fan, and the light source heat sink are arranged sequentially along the axial direction of the first external cooling fan.

10. An LCD projector, characterized in that, It includes a projection housing and a sealed optical engine with uniform heat dissipation as described in any one of claims 1-9, disposed in the projection housing.

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