CN223784616U

CN223784616U - A sealed optical engine with uniform heat dissipation and an LCD projector

Info

Publication number: CN223784616U
Application number: CN202520449132.6U
Authority: CN
Inventors: 徐宝山; 叶超; 郑祥泽
Original assignee: Guangzhou Rigal Electronics Co ltd
Current assignee: Guangzhou Rigal Electronics Co ltd
Priority date: 2025-03-14
Filing date: 2025-03-14
Publication date: 2026-01-09
Anticipated expiration: 2035-03-14

Abstract

The utility model relates to a sealed optical machine with uniform heat dissipation and an LCD projector, wherein the sealed optical machine comprises a shell, 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 mutually connected, the cold end radiator comprises a plurality of first heat dissipation fins which are sequentially arranged at intervals along a first horizontal direction, a gap between two adjacent first heat dissipation fins extends along a second horizontal direction which is perpendicular to the first horizontal direction, the internal circulation fan is an eddy fan, the cold end radiator is positioned at an air outlet of the internal circulation fan, and the central line of the air outlet of the internal circulation fan is parallel to a horizontal plane and forms an included angle with the second horizontal direction.

Description

Closed ray apparatus and LCD projector that heat dissipation is even

Technical Field

The utility model relates to the technical field of LCD projectors, in particular to a closed optical machine with uniform heat dissipation and an LCD projector.

Background

The LCD closed type optical machine can effectively prevent dust and pollutants from entering the optical path, so that the influence of the dust on the panel is obviously reduced, the projection equipment can be widely suitable for various use occasions, and the service life of the projection equipment can be greatly prolonged.

However, the closed environment presents great difficulties in dissipating heat from the optical components within the light engine. The LCD screen, the polarizer and other optical devices are key heat dissipation components of the optical machine, but due to the specificity, the heat dissipation can only be performed by a thermal convection mode. Therefore, the common heat dissipation mode of the current closed type optical engine is that the internal circulation flow field of the optical engine drives air to circulate through the operation of the vortex fan, the air conducts heat to the outside through heat exchange through the radiator, and finally the heat is taken away by the external flow field.

The LCD screen is a part with larger heat in the optical machine, and the arrangement positions of the vortex fan and the radiator are unreasonable in the prior art, and the air outlet of the vortex fan is provided with a certain angle and is uneven, so that the air is not stable enough when flowing through the LCD screen, the heat dissipation efficiency of each position of the LCD screen is inconsistent, the left and right or up and down temperature distribution of the LCD screen and the unevenness thereof are caused, and the heat dissipation effect of the LCD screen is influenced.

Disclosure of utility model

Based on the above, the utility model aims to overcome the defects of the prior art and provide a closed optical machine with uniform heat dissipation and an LCD projector.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a sealed optical engine with uniform heat dissipation, comprising:

the device comprises a shell, an optical device, a heat radiation module, an internal circulation fan and a first external heat radiation fan;

An upper cavity and a lower cavity which are arranged up and down are formed in the shell, a first ventilation opening and a second ventilation opening which are communicated with the upper cavity and the lower cavity are also formed in the shell, and the lower cavity, the first ventilation opening, the upper cavity and the second ventilation opening are sequentially communicated to form an internal circulation air channel;

The optical device is arranged in the upper cavity, the optical device comprises an LCD screen, and the LCD screen is positioned in the projection of the first ventilation opening in the vertical direction;

The heat radiation module comprises a hot end radiator and a cold end radiator which are connected with each other, the hot end radiator is arranged outside the shell, the cold end radiator and the internal circulation fan are arranged in the lower cavity, the cold end radiator comprises a plurality of first heat radiation fins which are sequentially arranged at intervals along a first horizontal direction, gaps between two adjacent first heat radiation fins extend along a second horizontal direction which is perpendicular to the first horizontal direction, the internal circulation fan is an eddy fan, an air inlet of the internal circulation fan is right opposite to the second air inlet, the cold end radiator is positioned at an air outlet of the internal circulation fan, and the central line of the air outlet of the internal circulation fan is parallel to a horizontal plane and is arranged at an included angle with the second horizontal direction;

The first external heat dissipation fan is arranged outside the shell and used for cooling the hot end radiator.

As one implementation mode, the included angle between the central line of the air outlet of the internal circulation fan and the second horizontal direction is a, wherein a is more than or equal to 150 degrees and less than or equal to 175 degrees.

As an implementation mode, the optical device further comprises a first phenanthrene mirror, heat-insulating glass, a second phenanthrene mirror and a reflective mirror, wherein the first phenanthrene mirror, the heat-insulating glass, the LCD screen, the second phenanthrene mirror and the reflective mirror are sequentially arranged along the light propagation direction.

As an embodiment, at least a part of the reflector is located in the second vent to divide the second vent into a first area and a second area, when viewed in a vertical direction, wherein the first area is located at a side of the reflector facing the second phenanthrene mirror, the second area is located at a side of the reflector facing away from the second phenanthrene mirror, and an area of the first area is smaller than an area of the second area.

As one embodiment, the bottom of the reflector is spaced apart from the bottom wall of the upper cavity by a predetermined distance.

As an embodiment, the hot end radiator and the cold end radiator are connected through a heat conducting pipe.

As an implementation mode, the sealed optical engine further comprises a light emitting unit, the light emitting unit comprises an LED light source and a light funnel, a mounting opening is formed in one side, corresponding to the first phenanthrene mirror, of the shell, a light outlet of the light funnel is in butt joint with the mounting opening, and the LED light source is arranged at a light inlet of the light funnel.

As an implementation mode, the sealed optical engine further comprises a light source radiator and a second external heat radiation fan, wherein the light source radiator is used for radiating the LED light source, and the second external heat radiation fan is used for cooling the light source radiator.

As an implementation manner, the first external heat dissipation fan and the second external heat dissipation fan are both axial flow fans, and the first external heat dissipation fan, the hot end radiator, the second external heat dissipation fan and the light source radiator are sequentially arranged along the axial direction of the first external heat dissipation fan.

According to the technical scheme, in the closed optical engine, the positions of the internal circulation fan and the cold end radiator are adjusted, so that air can be more uniformly radiated when flowing through the LCD screen, and the radiating effect is improved.

The LCD projector comprises a projection shell and the sealed optical machine which is arranged in the projection shell and has uniform heat dissipation.

For a better understanding and implementation, the present utility model is described in detail below with reference to the drawings.

Drawings

FIG. 1 is a schematic view of a closed optical engine according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional side view of a closed optical engine according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional top view of a closed optical engine according to an embodiment of the present application;

FIG. 4 is a schematic view of a hidden part of the bottom of a closed optical engine according to an embodiment of the present application;

FIG. 5 is a schematic diagram of the internal circulation fan and cold end radiator in an embodiment of the application;

FIG. 6 is a schematic diagram of an LCD projector according to an embodiment of the application;

Reference numerals illustrate:

1. The LED light source comprises a shell, an upper cavity, 12, a lower cavity, 13, a first ventilation opening, 14, a second ventilation opening, 141, a first area, 142, a second area, 10, an inner circulation air duct, 21, a first phenanthrene mirror, 22, heat insulation glass, 23, an LCD screen, 24, a second phenanthrene mirror, 25, a reflector, 31, a hot end radiator, 32, a cold end radiator, 321, a first radiating fin, L1, a first horizontal direction, L2, a second horizontal direction, 4, an inner circulation fan, L3, a central line, 51, a first external radiating fan, 52, a second external radiating fan, 61, an LED light source, 62, a light funnel, 7, a light source radiator, 8 and a projection shell.

Detailed Description

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible implementations and advantages of the present utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present utility model.

Referring to fig. 1 to 5, the present embodiment provides a sealed optical engine with uniform heat dissipation, which includes a housing 1, an optical device, a heat dissipation module, an inner circulation fan 4, and a first external heat dissipation fan 51.

The shell 1 is used for accommodating various components, an upper cavity 11 and a lower cavity 12 which are arranged up and down are formed in the shell 1, a first ventilation opening 13 and a second ventilation opening 14 which are communicated with the upper cavity 11 and the lower cavity 12 are further formed in the shell 1, and the lower cavity 12, the first ventilation opening 13, the upper cavity 11 and the second ventilation opening 14 are sequentially communicated to form an internal circulation air duct 10. When the internal circulation fan 4 is started, air in the internal circulation air duct 10 sequentially enters the upper cavity 11 from the lower cavity 12 through the first ventilation opening 13, and then flows back to the lower cavity 12 through the second ventilation opening 14.

The optics are arranged in the upper chamber 11, wherein the optics comprise an LCD screen 23, which LCD screen 23 is located in the projection of the first ventilation opening 13 in the vertical direction. In other words, the LCD screen 23 in this embodiment is perpendicular to the horizontal plane, and the bottom of the LCD screen 23 is located in the first ventilation opening 13, so that the air discharged from the first ventilation opening 13 can flow through two opposite sides of the LCD screen 23 to effectively dissipate heat of the LCD screen 23.

The heat dissipation module comprises a hot end radiator 31 and a cold end radiator 32 which are connected with each other, the hot end radiator 31 is arranged outside the shell 1, the cold end radiator 32 and the internal circulation fan 4 are arranged in the lower cavity 12, the cold end radiator 32 comprises a plurality of first heat dissipation fins 321 which are sequentially arranged at intervals along a first horizontal direction L1, gaps between two adjacent first heat dissipation fins 321 extend along a second horizontal direction L2 which is perpendicular to the first horizontal direction L1, the internal circulation fan 4 is an eddy fan, an air inlet of the internal circulation fan 4 is opposite to the second air inlet 14, the cold end radiator 32 is positioned at an air outlet of the internal circulation fan 4, a central line L3 of the air outlet of the internal circulation fan 4 is parallel to a horizontal plane, and is arranged at an included angle with the second horizontal direction L2, that is, the air outlet of the internal circulation fan 4 is deflected by a certain angle so as not to be opposite to gaps between the plurality of first heat dissipation fins 321, wherein the internal circulation fan 4 is positioned at the normal line of the air outlet of the internal circulation fan 4. The first external heat dissipation fan 51 is disposed outside the housing 1, and is configured to cool the hot end radiator 31.

Because the heat generated by the LCD screen 23 is higher, the temperature in the internal circulation air duct 10 is higher, when the internal circulation fan 4 is started, the air in the internal circulation air duct 10 can circulate, the air blown by the internal circulation fan 4 exchanges heat when flowing through the cold end radiator 32, so that the air is cooled to be cold air, and the cold air is cooled by flowing through the LCD screen 23, so that an air-cooled internal circulation is formed, and the heat generated by the LCD screen 23 can be taken away rapidly. The cold end radiator 32 is heated during heat exchange, so that heat can be conducted to the hot end radiator 31 positioned outside the shell 1 by connecting the hot end radiator 31, and the hot end radiator 31 is cooled by the first external cooling fan 51, so that the cold end radiator 32 is in a low-temperature state, the rapid heat dissipation of the LCD screen 23 is effectively realized, the normal operation of the LCD screen 23 is effectively ensured, and the service life of the LCD screen 23 is prolonged.

In this embodiment, the cold end radiator 32 is disposed at the air outlet of the inner circulation fan 4, gaps between the first heat dissipation fins 321 form a plurality of miniature air channels, which can play a role in rectifying the entering air, and meanwhile, the air outlet of the inner circulation fan 4 is deflected by a certain angle to make the air outlet not right against the gaps between the first heat dissipation fins 321, so that the rectifying effect on the air is better, and thus, when the air exhausted from the cold end radiator 32 flows through the LCD screen 23, the air can uniformly exchange heat at each position of the LCD screen 23, so that the temperature of the LCD screen 23 is more uniform, and the heat dissipation effect is improved.

As can be seen from the above technical solutions, in the closed optical engine according to the embodiment of the present application, by adjusting the positions of the inner circulation fan 4 and the cold end radiator 32, compared with the prior art, air can be more uniformly cooled when flowing through the LCD screen 23, so that the LCD screen 23 is more uniformly cooled, and the cooling effect is improved.

In this embodiment, an included angle between a center line L3 of an air outlet of the internal circulation fan 4 and the second horizontal direction L2 is a, where a is 150 ° or less and a <175 °. The air outlet angle thus set may make the rectifying effect of the cold end radiator 32 on air better.

The optical device further comprises a first phenanthrene mirror 21, heat-insulating glass 22, a second phenanthrene mirror 24 and a reflecting mirror 25, wherein the first phenanthrene mirror 21, the heat-insulating glass 22, the LCD screen 23, the second phenanthrene mirror 24 and the reflecting mirror 25 are sequentially arranged along the light propagation direction. In this embodiment, the light propagation direction is the direction from the first ventilation opening 13 to the second ventilation opening 14. The first phenanthrene mirror 21, the heat-insulating glass 22, the second phenanthrene mirror 24 and the reflective mirror 25 also have certain heat, and the first phenanthrene mirror, the heat-insulating glass 22, the second phenanthrene mirror and the reflective mirror 25 are placed in the upper cavity 11 so as to be beneficial to cooling together.

In this embodiment, at least a portion of the reflective mirror 25 is located in the second vent 14 as viewed in the vertical direction to divide the second vent 14 into a first region 141 and a second region 142, wherein the first region 141 is located on a side of the reflective mirror 25 facing the second phenanthrene mirror 24, the second region 142 is located on a side of the reflective mirror 25 facing away from the second phenanthrene mirror 24, and an area of the first region 141 is smaller than an area of the second region 142. In practical tests, because the air flow on the side of the reflector 25 facing the second phenanthrene mirror 24 is larger, and the air flow on the side of the reflector 25 facing away from the second phenanthrene mirror 24 is smaller, the overall air flow is unbalanced, and the overall heat dissipation is easy to be uneven, therefore, the area of the first region 141 is smaller than that of the second region 142 by separating the reflector 25 from the second ventilation opening 14, so that the air flow entering the lower cavity 12 through the first region 141 at the place with larger air flow is more difficult, the air flow entering the lower cavity 12 through the second region 142 at the place with smaller air flow is easier, and the air flow on both sides of the reflector 25 can be balanced, so that the air flow is more uniform.

Preferably, in this embodiment, the bottom of the reflector 25 is spaced from the bottom wall of the upper cavity 11 by a preset distance, so that two sides of the reflector 25 are communicated, and noise generated when the internal circulation fan 4 returns air can be reduced.

Preferably, the hot-end radiator 31 and the cold-end radiator 32 are connected by a heat conduction pipe, so that the heat exchange efficiency of the two is higher.

Preferably, the sealed optical engine of this embodiment further includes a light emitting unit, the light emitting unit includes an LED light source 61 and a light funnel 62, a mounting opening is disposed on a side of the housing 1 corresponding to the first phenanthrene mirror 21, a light outlet of the light funnel 62 is abutted to the mounting opening, and the LED light source 61 is disposed at a light inlet of the light funnel 62. White light emitted by the LED light source 61 is focused by the light funnel 62 and then sequentially enters the first phenanthrene mirror 21, the heat-insulating glass 22, the LCD screen 23, the second phenanthrene mirror 24 and the reflective mirror 25 to form image light with image information.

Preferably, the sealed optical engine of the present embodiment further includes a light source radiator 7 and a second external heat dissipation fan 52, where the light source radiator 7 is configured to dissipate heat of the LED light source 61, and the second external heat dissipation fan 52 is configured to cool the light source radiator 7.

Further, in this embodiment, the first external heat dissipation fan 51 and the second external heat dissipation fan 52 are both axial flow fans, and the first external heat dissipation fan 51, the hot end radiator 31, the second external heat dissipation fan 52, and the light source radiator 7 are sequentially arranged along the axial direction of the first external heat dissipation fan 51. By this arrangement, the first external heat radiation fan 51 and the second external heat radiation fan 52 are connected in series, and heat radiation efficiency is increased.

In the compact space, the closed optical engine of the embodiment has the advantages that the positions of all devices are designed to be neat and reasonable, heat is dissipated for all heating devices, and all air paths are reasonable and efficient. The closed optical engine can ensure the whole safe and stable operation with low cost, high efficiency and reasonable heat dissipation air path without using a semiconductor refrigerating sheet and a water cooling heat dissipation mode.

As shown in fig. 6, the present embodiment further provides an LCD projector, which includes a projection housing 8 and the sealed optical engine of the present embodiment disposed in the projection housing 8, and the LCD projector has the beneficial effects of the sealed optical engine of the present embodiment, which is not described herein.

The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims

1. A sealed optical engine with uniform heat dissipation, characterized in that it comprises:

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 comprises 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.