CN214311263U - Laser projection device - Google Patents

Abstract

The embodiment of the application discloses laser projection equipment belongs to the technical field of projection. The laser projection apparatus includes: an optical engine for emitting a light beam; the projection screen is used for receiving the light beams to display pictures; the heat dissipation plate is positioned on the back of the projection screen; the heat conduction structure is respectively connected with the heat dissipation plate and the optical engine and is used for transferring heat generated by the optical engine to the heat dissipation plate so as to dissipate heat through the heat dissipation plate; and the heat dissipation fan is configured to drive airflow near the heat dissipation plate to flow. In the embodiment of the application, the heat generated by the optical engine is conducted to the heat dissipation plate through the heat conduction structure, and the heat dissipation is carried out through the heat dissipation plate, so that the problem of high temperature of the optical engine is avoided, and the optical performance of the optical engine is ensured; the heat dissipation fan accelerates the flow of air flow near the heat dissipation plate, and improves the heat dissipation effect of the heat dissipation plate, so that the heat dissipation effect of the optical engine is improved.

Description

Laser projection device

Technical Field

The embodiment of the application relates to the technical field of projection, in particular to laser projection equipment.

Background

With the continuous development of science and technology, laser projection equipment is more and more applied to the work and the life of people. Currently, a laser projection apparatus mainly includes an optical engine and a projection screen. The optical engine comprises a light source system, an illumination system and a lens system, wherein the light source system is used for emitting light beams to the illumination system, the illumination system and the lens system are used for processing the emitted light beams and emitting the processed light beams to a projection screen, and the projection screen is used for receiving the light beams to realize the display of pictures. When the light source system emits light beams and the lighting system processes the light beams, the light source system can be used as a heating device to generate a large amount of heat.

In the related art, in order to avoid the temperature of the optical engine from being increased due to the heat generated by the light source system and the illumination system, thereby affecting the optical performance of the optical engine, the optical engine further includes a heat dissipation system, so that the heat dissipation of the heat generating devices such as the light source system and the illumination system can be realized through the heat dissipation system, and the temperature of the optical engine is reduced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a laser projection device, which can reduce the volume of an optical engine included in the laser projection device and improve the heat dissipation effect of the optical engine. The technical scheme is as follows:

a laser projection device, the laser projection device comprising:

an optical engine to emit a light beam;

the projection screen is used for receiving the light beam to display a picture;

the heat dissipation plate is positioned on the back of the projection screen;

the heat conduction structure is respectively connected with the heat dissipation plate and the optical engine, and is used for transferring heat generated by the optical engine to the heat dissipation plate so as to dissipate heat through the heat dissipation plate;

a heat dissipation fan configured to drive an airflow near the heat dissipation plate to flow.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

in the embodiment of the application, the heat that the optical engine produced can be conducted to the heating panel through heat conduction structure, and then dispels the heat through the heating panel, has realized the heat dissipation to the optical engine, has avoided the higher problem of optical engine temperature, has guaranteed the optical property of optical engine. When the heat dissipation plate dissipates heat, the flow of air flow near the heat dissipation plate is accelerated through the arrangement of the heat dissipation fan, the heat dissipation effect of the heat dissipation plate is improved, and therefore the heat dissipation effect of the optical engine is improved. In addition, the mode of radiating through the radiating plate cancels the arrangement of a radiating system in the optical engine, and reduces the volume of the optical engine.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic side view of a laser projection apparatus according to an embodiment of the present disclosure;

fig. 2 is a schematic rear view of a laser projection apparatus according to an embodiment of the present disclosure;

fig. 3 is a schematic top view of a laser projection apparatus according to an embodiment of the present disclosure;

FIG. 4 is a schematic side view of another laser projection apparatus provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a fin-type heat dissipation plate according to an embodiment of the present application;

fig. 6 is a schematic front view of a laser projection apparatus according to an embodiment of the present disclosure;

FIG. 7 is a schematic rear view of another laser projection apparatus provided in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a fin-type liquid cooling head provided in an embodiment of the present application;

FIG. 9 is a schematic rear view of another laser projection apparatus provided in an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a vapor chamber provided in an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a section A-A of the vapor chamber shown in FIG. 10 according to an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of a heat dissipation manner of a laser projection apparatus according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of another heat dissipation manner of a laser projection apparatus according to an embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of another heat dissipation method of a laser projection apparatus according to an embodiment of the present disclosure;

fig. 15 is a schematic structural diagram of another heat dissipation method of a laser projection apparatus according to an embodiment of the present disclosure;

fig. 16 is a schematic structural diagram of another heat dissipation method of a laser projection apparatus according to an embodiment of the present disclosure;

fig. 17 is a schematic structural diagram of functional components of a laser projection apparatus according to an embodiment of the present disclosure.

Reference numerals:

1: an optical engine; 2: a projection screen; 3: a heat dissipation plate; 4: a heat conducting structure; 5: a heat radiation fan; 6: a thermal insulation layer; 7: a functional component; 8: a connecting frame;

11: an optical engine body; 12: a housing;

111: a light source system; 112: an illumination system; 113: a lens system;

121: through hole wind; 122: an air inlet; 123: an air outlet;

31: a fin-type heat dissipation plate; 32: a temperature equalizing plate;

311: a heat sink; 312: a heat pipe; 321: a metal plate; 322: a protrusion; 323: sealing the cavity;

41: a circulation line; 42: a circulation pump; 43: a first liquid-cooled head; 44: a second liquid cooling head; 45: a housing; 46: a heat conductive sheet; 47: a liquid replenishing box;

411: a first pipeline; 412: a second pipeline; 413: a quick-connect joint;

71: a control main board; 72: a display panel; 73: a power panel;

81: a connecting rod; 82: a connecting plate.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be further described in detail with reference to the accompanying drawings.

Fig. 1 illustrates a side view structural schematic diagram of a laser projection apparatus according to an embodiment of the present application, fig. 2 illustrates a rear view structural schematic diagram of a laser projection apparatus according to an embodiment of the present application, and fig. 3 illustrates a structural schematic diagram of a heat dissipation manner of a laser projection apparatus according to an embodiment of the present application. As shown in fig. 1, 2 and 3, the laser projection apparatus includes: an optical engine 1, the optical engine 1 being configured to emit a light beam; the projection screen 2 is used for receiving the light beams to display pictures; the heat dissipation plate 3, the heat dissipation plate 3 locates at the back of the projection screen 2; the heat conduction structure 4 is respectively connected with the heat dissipation plate 3 and the optical engine 1, and the heat conduction structure 4 is used for transferring heat generated by the optical engine 1 to the heat dissipation plate 3 so as to dissipate heat through the heat dissipation plate 3; and a heat radiation fan 5, wherein the heat radiation fan 5 is configured to drive the airflow near the heat radiation plate 3 to flow.

In this application embodiment, the heat that optical engine 1 produced can be conducted to heating panel 3 through heat conduction structure 4, and then dispels the heat through heating panel 3, has realized the heat dissipation to optical engine 1, has avoided the higher problem of optical engine 1 temperature, has guaranteed optical engine 1's optical property. When the heat dissipation plate 3 dissipates heat, the flow of the air flow near the heat dissipation plate 3 is accelerated by the arrangement of the heat dissipation fan 5, and the heat dissipation effect of the heat dissipation plate 3 is improved, so that the heat dissipation effect of the optical engine 1 is improved. In addition, the mode of heat dissipation through the heat dissipation plate 3 eliminates the arrangement of a heat dissipation system in the optical engine 1, and reduces the volume of the optical engine 1.

Optionally, the optical engine 1 and the projection screen 2 are of a split structure, and the heat dissipation plate 3 is fixed on the projection screen 2. The optical engine 1 is now supported on a support platform and the projection screen 2 is suspended from a hanger or wall.

For the condition that the projection screen 2 is hung on the wall, in order to ensure the normal heat dissipation of the heat dissipation plate 3, the distance between the projection screen 2 and the wall must be greater than the thickness of the heat dissipation plate 3, so as to ensure that a certain space can be reserved between the heat dissipation plate 3 and the wall, and a heat dissipation channel is formed.

Optionally, the optical engine 1 and the projection screen 2 are of an integral structure, and in some embodiments, as shown in fig. 1, the laser projection apparatus further includes a connecting frame 8, the optical engine 1 and the projection screen 2 are respectively fixedly connected to the connecting frame 8, and the heat dissipation plate 3 is fixed on the connecting frame 8. At this time, the laser projection apparatus may be supported on a support platform by the optical engine 1 or the connection bracket 8, or suspended on a suspension bracket or a wall body by the connection bracket 8. Wherein, the connecting frame 8 is in a plane structure or an L-shaped structure.

To hanging the condition in the wall body through link 8, in order to guarantee the normal heat dissipation of heating panel 3, link 8 has certain thickness, and heating panel 3 fixes the one side that is close to projection screen 2 on link 8 to guarantee to reserve certain space between heating panel 3 and the wall body, in order to form the heat dissipation passageway.

Alternatively, as shown in fig. 2, the connection frame 8 includes two vertical connection bars 81, and a connection plate 82 connecting the two connection bars 81, the projection screen 2 is fixed to the connection bars 81, and the heat dissipation plate 3 is fixed to the connection plate 82.

Wherein, the connecting rod 81 can be selected from a square tube to ensure that the connecting frame 8 has a certain thickness; the connecting plate 82 is a flat plate and is located in a plane parallel to the vertical direction. Thus, when the laser projection device is hung on a wall, the two connecting rods 81 are attached to the wall, so that a heat dissipation channel in the vertical direction is formed between the two connecting rods 81, and the heat dissipation effect of the heat dissipation plate 3 is ensured.

In addition, when the optical engine 1 and the projection screen 2 are connected through the connecting frame 8, in order to ensure that the light beam emitted from the optical engine 1 is just projected onto the projection screen 2 and that the image displayed on the projection screen 2 is not deviated, skewed, distorted, and the like, the fixing position of the optical engine 1 and/or the projection screen 2 on the connecting frame 8 can be adjusted. That is, relative adjustment between the optical engine 1 and the projection screen 2 in the vertical direction, the horizontal direction, the pitch direction, and the like can be achieved by adjusting the position of the optical engine 1 or adjusting the position of the projection screen 2.

The fixing manner of the optical engine 1 and the projection screen 2 may refer to related technologies to ensure that the optical engine 1 and the projection screen 2 can be adjusted relative to the connecting frame 8, which is not described herein again in this embodiment of the application. For example, the optical engine 1 and the projection screen 2 are fixed on the connecting frame 8 by casters, so that the distance between the optical engine 1 or the projection screen 2 and the connecting frame 8 can be adjusted by adjusting the casters, and the relative position between the optical engine 1 and the projection screen 2 can be adjusted in the pitching direction.

In the embodiment of the present application, since the heat conducting structure 4 can conduct the heat generated by the optical engine 1 to the heat dissipating plate 3, that is, to the back surface of the projection screen 2, when the heat is dissipated through the heat dissipating plate 3, the dissipated heat may affect the projection screen 2. Therefore, as shown in fig. 4, the laser projection apparatus further includes a heat insulating layer 6, and the heat insulating layer 6 is located between the heat dissipation plate 3 and the projection screen 2. Therefore, the influence of the heat emitted by the heat dissipation plate 3 on the projection screen 2 can be isolated through the heat insulation layer 6, and the display effect of the projection screen 2 is ensured.

The projection of the heat insulating layer 6 on the plane of the heat dissipation plate 3 is superposed on the heat dissipation plate 3, or covers the heat dissipation plate 3. The insulating layer 6 is illustratively the same size as the projection screen 2, i.e. the entire rear side of the projection screen 2 is provided with the insulating layer 6.

In the embodiment of the present application, the heat conducting structure 4 is mainly used for conducting heat, and therefore, the heat conducting structure 4 may be a heat conducting member, and certainly, the heat conducting structure 4 may also be another structure as long as the heat generated by the optical engine 1 can be conducted to the heat dissipation plate 3, which is not limited in the embodiment of the present application.

The specific structure of the heat conducting structure 4 is different due to the different heat dissipation ways of the heat dissipation plate 3. Therefore, the heat conducting structure 4 will be explained next in conjunction with the structure of the heat radiating plate 3.

In some embodiments, the heat sink 3 dissipates heat by a combination of liquid cooling and heat radiation. Alternatively, as shown in fig. 5, the heat dissipation plate 3 is a fin-type heat dissipation plate 31. The fin-type heat dissipation plate 31 includes a plurality of heat dissipation fins 311 and heat pipes 312, the heat pipes 312 are coiled and penetrate through the plurality of heat dissipation fins 311, and the ends of the heat pipes 312 are communicated with the heat conducting structure 4.

In this way, the heat conducting structure 4 can conduct heat to the coolant inside the heat pipe 312, so that the temperature of the coolant is raised, and the heated coolant conducts the heat to the heat sink 311 again, so as to radiate the heat through the heat sink 311.

As for the structure of the heat dissipation plate 3 described above, alternatively, as shown in fig. 3, the heat conductive structure 4 includes a circulation line 41, a circulation pump 42, and a first liquid-cooling head 43; the circulating pump 42 and the first liquid cooling head 43 are connected in series on the circulating pipeline 41, and two ends of the heat pipe 312 are communicated with two ends of the circulating pipeline 41; the first liquid cooling head 43 is connected to the optical engine 1, the circulating pump 42 is used for promoting the coolant to circulate in the circulating pipeline 41 and the heat pipe 312, and the heat generated by the optical engine 1 is conducted to the plurality of cooling fins 311 through the first liquid cooling head 43 and the coolant.

Thus, when the circulation pump 42 causes the coolant to flow in the circulation pipeline 41 and the heat pipe 312, heat generated by the optical engine 1 can be conducted to the coolant with a lower temperature through the first liquid-cooling head 43, so that the temperature of the coolant is raised, the coolant with a higher temperature circulates to the heat pipe 312, and then the coolant with a higher temperature in the heat pipe 312 conducts the heat to the heat sink 311 for heat dissipation, thereby cooling the coolant, and the cooled coolant continues to circulate to the position of the first liquid-cooling head 43, so as to circulate, thereby dissipating heat of the optical engine 1.

Optionally, the circulation pipeline 41 may be made of a hard pipe, and certainly, may also be made of a soft pipe, which is not limited in this application.

In combination with the above description, when it is necessary to adjust the relative position between the optical engine 1 and the projection screen 2, if the hard pipe is used as the circulation pipe 41, it is difficult to adjust the position of the optical engine 1 alone or the position of the projection screen 2 alone due to the influence of the hard pipe. Therefore, it is necessary to use a soft pipe material as the circulation line 41. In this way, the flexible characteristic of the soft tube is combined to realize the independent adjustment of the optical engine 1 or the independent adjustment of the projection screen 2, so that the adjustment of the relative position between the optical engine 1 and the projection screen 2 is realized.

In some embodiments, as shown in fig. 6 and 7, the circulation line 41 includes a first line 411, a second line 412, and a quick-connect coupling 413; the first pipeline 411 is positioned in the optical engine 1, and the first liquid cooling head 43 is connected in series on the first pipeline 411; the second pipeline 412 includes two pipe sections, two pipe ends of the first pipeline 411 extend out of the optical engine 1 and are respectively communicated with one end of the two pipe sections through quick connectors 413, and the other ends of the two pipe sections are respectively communicated with two ends of the heat pipe 312 through the quick connectors 413.

In this way, since the first pipe 411 and the second pipe 412 are connected by the quick connector 413, the first pipe 411 and the second pipe 412 can be quickly detached by the quick connector 413, so as to separate the optical engine 1 from the heat conducting structure 4, thereby facilitating the subsequent separate inspection and maintenance of the optical engine 1.

Optionally, the circulation pump 42 is connected in series to the second pipeline 412, so that the circulation pump 42 can be disposed on the back of the optical engine 1 or the back of the projection screen 2, and the circulation pump 42 is prevented from being connected in series to the first pipeline 411 to increase the volume of the optical engine 1. In addition, in order to ensure the adjustment of the relative position between the optical engine 1 and the projection screen 2, the second pipeline 412 is a hose.

Optionally, the first liquid cooling head 43 and the optical engine 1 may be of an integrated structure, so that the number of parts included in the heat conducting structure 4 can be reduced, and the maximum contact surface between the optical engine 1 and the first liquid cooling head 43 can be ensured, thereby ensuring the heat transfer effect between the optical engine 1 and the first liquid cooling head 43.

Of course, the first liquid cooling head 43 is provided separately from the optical engine 1, and in this case, the first liquid cooling head 43 is fixedly connected to the optical engine 1 by a fixing screw. At this time, in order to ensure the heat transfer effect between the optical engine 1 and the first liquid cooling head 43, the flatness of the two contact surfaces between the first liquid cooling head 43 and the optical engine 1 is smaller than the flatness threshold, so as to ensure the heat conduction effect between the optical engine 1 and the cooling liquid with lower temperature through the first liquid cooling head 43.

Further, in order to avoid the situation that a gap exists between the first liquid cooling head 43 and the optical engine 1 due to uneven contact surface, a heat conducting material is filled between the first liquid cooling head 43 and the optical engine 1, so that the gap is filled with the heat conducting material, and the maximum heat conduction between the first liquid cooling head 43 and the optical engine 1 is ensured.

The structure of the first liquid cooling head 43 may refer to the related art, and the embodiment of the present application is not limited thereto. Illustratively, the first liquid cooling head 43 is a fin type liquid cooling head or a liquid cooling head of an S-shaped structure.

As shown in fig. 8, a fin-type liquid cooling head is provided, which includes a housing 45, a heat conducting fin 46 connected to a side wall is provided in the housing 45, and a liquid inlet and a liquid outlet are provided at two ends of the housing 45; the housing 45 is connected in series to the circulation line 41 through a liquid inlet and a liquid outlet, and a side wall to which the heat conductive sheet 46 is connected is in contact with a heat radiation surface of the optical engine 1. Thus, when the cooling liquid flows in the circulation pipeline 41, the cooling liquid can flow into the housing 45 of the liquid cooling head, and at this time, the heat radiating surface of the optical engine 1 conducts heat to the heat conducting fin 46, and further conducts the heat to the cooling liquid with lower temperature, so that heat conduction is realized.

In other embodiments, the heat-dissipating plate 3 dissipates heat by means of heat radiation. Alternatively, as shown in fig. 9, the heat dissipation plate 3 is a temperature equalization plate 32. In order to facilitate the temperature equalization plate 32 to absorb the heat conducted by the heat conduction structure 4 and increase the area of the temperature equalization plate 32 for radiating heat, the heat conduction structure 4 is connected to the bottom of the temperature equalization plate 32. Of course, the heat conducting structure 4 may also be connected to other positions of the temperature equalizing plate 32, which is not limited in this embodiment.

The area of the temperature equalizing plate 32 can be set according to actual conditions. The larger the area of the temperature equalizing plate 32 is, the larger the radiation heat dissipation area of the temperature equalizing plate 32 is, and thus the better the heat dissipation effect is.

The specific structure of the vapor chamber 32 can refer to the related art, and the embodiment of the present application is not limited thereto. Illustratively, as shown in fig. 10 and 11, the temperature-uniforming plate 32 includes two metal plates 321, edges of the two metal plates 321 are fixedly connected, and the two metal plates 321 are opposite to the protrusion 322, so as to form a sealed cavity 323 between the two metal plates 321, and the sealed cavity 323 is filled with a normal temperature phase-change refrigerant. Thus, the heat conducting structure 4 conducts heat to the liquid refrigerant, the liquid refrigerant absorbs heat and is gasified to form a gaseous refrigerant, the gaseous refrigerant moves upwards, the liquid refrigerant on the upper portion moves downwards, and the heat of the gaseous refrigerant is radiated and dissipated through the two layers of metal plates 321 and liquefied during the movement process of the gaseous refrigerant to form the liquid refrigerant; the liquid refrigerant moving downward continuously absorbs the heat conducted by the heat conducting structure 4, thereby realizing the cooling of the heat conducting structure 4.

As for the structure of the heat dissipation plate 3 described above, alternatively, as shown in fig. 3 and 9, the heat conductive structure 4 includes a circulation line 41, a circulation pump 42, a first liquid-cooling head 43, and a second liquid-cooling head 44; the circulating pump 42, the first liquid cooling head 43 and the second liquid cooling head 44 are connected in series on the circulating pipeline 41, the first liquid cooling head 43 is connected with the optical engine 1, the second liquid cooling head 44 is connected with the heat dissipation plate 3, and the circulating pump 42 is used for promoting the cooling liquid in the circulating pipeline 41 to circularly flow; the first liquid cooling head 43 is used for conducting heat generated by the optical engine 1 to the cooling liquid, and the second liquid cooling head 44 is used for conducting heat of the cooling liquid to the heat dissipation plate 3.

Thus, when the circulation pump 42 causes the coolant to flow in the circulation pipeline 41, the optical engine 1 generates heat and can conduct the heat to the coolant with lower temperature through the first liquid cooling head 43, after the temperature of the coolant rises, the coolant with higher temperature circulates to the second liquid cooling head 44, and then the coolant with higher temperature conducts the heat to the heat dissipation plate 3 through the second liquid cooling head 44, so as to cool the coolant, and the coolant with lower temperature continues to circulate to the position of the first liquid cooling head 43, so as to circulate, and thus, the heat dissipation of the optical engine 1 is realized. And the heat conducted to the heat dissipation plate 3 can be dissipated through the heat dissipation plate 3, so that the heat dissipation plate 3 is ensured to be at a lower temperature, and the heat conducted by the coolant with a higher temperature can be continuously absorbed.

The structure of the circulation pipeline 41, the connection between the first liquid cooling head 43 and the optical engine 1, the connection between the second liquid cooling head 44 and the heat dissipation plate 3, and the position of the circulation pump 42 can all refer to the description in the above embodiments. The only difference is that the second liquid cooling head 44 is connected in series to a second pipeline 412 included in the circulation pipeline 42, and two pipe ends of the first pipeline 411 extend out of the optical engine 1 and are respectively communicated with two pipe ends of the second pipeline 412 through quick connectors 413.

In the embodiment of the present application, as shown in fig. 3, the optical engine 1 includes a light source system 111, an illumination system 112, and a lens system 113, wherein a light-emitting side of the light source system 111 is connected to a light-entering side of the illumination system 112, a light-entering side of the lens system 113 is connected to the light-emitting side of the illumination system 112, and a light-emitting side of the lens system 113 faces the projection screen 2.

When the light source system 111 emits a light beam, the laser included in the light source system 111 generates a large amount of heat, and if the light source system 111 includes a fluorescent substance, the fluorescent substance also generates a large amount of heat, and the DMD included in the illumination system 112 also generates a large amount of heat when rotating the reflected light beam. Thus, the light source system 111 and the illumination system 112 included in the optical engine 1 are main heat generating devices.

In this way, when the heat generated by the optical engine 1 is conducted to the cooling liquid with a lower temperature through the first liquid cooling head 43, the plurality of heat generating devices included in the optical engine 1 can share one first liquid cooling head 43; alternatively, the optical engine 1 may include a plurality of heat generating devices individually connected to the first liquid cooling head 43, that is, the plurality of heat generating devices are connected to the first liquid cooling head 43.

When the plurality of heat generating devices share one first liquid cooling head 43, the plurality of heat generating devices are all connected to the first liquid cooling head 43 through the heat conductive member. Specifically, the heat conducting structure 4 further includes a plurality of heat conducting members, the plurality of heat conducting members and the plurality of heat generating devices are in one-to-one correspondence, one end of each heat conducting member is connected with the corresponding heat generating device, and the other end of each heat conducting member is connected with the first liquid cooling head 43. Thus, the heat conduction between the plurality of heating devices and the first liquid cooling head 43 is realized by the plurality of heat conduction members, and the number of the first liquid cooling head 43 is reduced.

When the plurality of heating devices are connected with the first liquid cooling head 43, the first liquid cooling heads 43 connected with the plurality of heating devices are connected in series and then connected in series on the circulating pipeline 41; or the first liquid cooling heads 43 connected with a plurality of heating devices are connected in parallel and then connected in series on the circulating pipeline 41 after being connected in parallel.

When the first liquid-cooling heads 43 connected with the plurality of heat generating devices are connected in series, for the case where the plurality of heat generating devices include the light source system 111 and the illumination system 112, since the laser included in the light source system 111 has a higher thermal power and a sensitivity to temperature is greater than the DMD included in the illumination system 112, the first liquid-cooling head 43 connected with the light source system 111 is located upstream of the first liquid-cooling head 43 connected with the illumination system 112. In this way, the laser included in the light source system 111 is cooled by the cooling liquid with a lower temperature, and then the DMD included in the illumination system 112 is cooled, so that the optical performance of each heat generating device is effectively ensured.

In addition, in the case where the light source system 111 includes a fluorescent substance, the laser and the fluorescent substance included in the light source system 111 generate heat, in which case the laser and the fluorescent substance may be individually connected to one first liquid-cooling head 43, and the first liquid-cooling heads 43 to which the laser and the fluorescent substance are connected may be connected in series or in parallel.

When the laser and the first liquid-cooled head 43 to which the fluorescent substance is connected are connected in series, the first liquid-cooled head 43 to which the illumination system 112 is connected is located upstream of the first liquid-cooled head 43 to which the fluorescent substance is connected, since the sensitivity of the fluorescent substance to temperature is smaller than the sensitivity of the DMD to temperature.

In summary, when the light source system 111 includes the fluorescent substance, the cooling liquid with a lower temperature firstly passes through the first liquid cooling head 43 connected to the laser, then passes through the first liquid cooling head 43 connected to the illumination system 112, and then passes through the first liquid cooling head 43 connected to the fluorescent substance, so as to sequentially dissipate heat of the laser, the illumination system 112, and the fluorescent substance.

In the embodiment of the present application, when heat is conducted through the cooling liquid, evaporation and the like inevitably occurs in the cooling liquid, which reduces the cooling liquid in the circulation line 41, and further causes a phenomenon that the cooling liquid in the circulation line 41 cannot be filled. At this time, when the circulation pump 42 causes the coolant to circulate, bubbles are likely to be generated, which causes cavitation in the circulation pump 42, and reduces the service life of the circulation pump 42. Therefore, as shown in fig. 12, the heat transfer structure 4 further includes a liquid replenishment tank 47, the liquid replenishment tank 47 is communicated with the circulation line 41, and the liquid replenishment tank 47 is used for replenishing the cooling liquid in the circulation line 41.

The fluid infusion tank 47 may be directly connected to the circulation line 411, or may be connected to the heat pipe 32 included in the heat dissipation plate 3, so as to indirectly connect to the circulation line 411. The outlet end of the replenishing tank 47 is communicated with the circulation line 41 through a tee joint, or the replenishing tank 47 is connected in series to the circulation line 41. In addition, in order to avoid the influence of dust, impurities, and the like on the heat transfer effect of the coolant in the circulation line 41, the outlet end of the liquid replenishment tank 47 has a filter to filter the coolant flowing into the circulation line 41 through the filter.

When the coolant is supplemented to the circulation line 41 through the fluid supplement tank 47, in some embodiments, a pressure booster is provided in the fluid supplement tank 47, and the pressure booster is used for adjusting the pressure at the outlet end of the fluid supplement tank 47. Thus, when the cooling liquid in the circulation pipeline 41 is lost, the pressure of the cooling liquid in the circulation pipeline 41 is reduced, and at the moment, the pressure of the cooling liquid at the outlet end of the liquid supplementing tank 47 is greater than the pressure of the cooling liquid in the circulation pipeline 41, so that automatic liquid supplementing is realized, and the condition that the service life of the circulation pump 42 is reduced is avoided.

Of course, in other embodiments, the liquid level of the cooling liquid in the liquid replenishing tank 47 is higher than the highest liquid level of the cooling liquid in the circulating system, so that the cooling liquid in the liquid replenishing tank 47 can be automatically replenished by the pressure difference of the cooling liquid, and the service life of the circulating pump 42 is prevented from being reduced.

In the embodiment of the present application, when the cooling fan 5 causes the airflow near the cooling plate 3 to flow, the cooling fan 5 is installed on the back surface of the optical engine 1, or as shown in fig. 3, the cooling fan 5 is installed on the back surface of the projection screen 2. Of course, the heat dissipation fan 5 may be installed at other positions as long as it can promote the airflow near the heat dissipation plate 3.

Since the heat dissipation fan 5 is only used to promote the airflow near the heat dissipation plate 3 to flow, only a small number of fans are needed to dissipate heat from the rest of the heat generating devices, and compared with the heat dissipation fan 5 included in the conventional heat dissipation system, the noise generated can be greatly reduced.

In addition, for the main heat generating device included in the optical engine 1, the generated heat can be conducted to the heat dissipating plate 3 through the heat conducting structure 4 for heat dissipation, and for the remaining heat generating devices included in the optical engine 1, such as the lens system 113, since the heat generated by the lens system 113 is less and the heat dissipating surface of the lens system 113 is not flat, it is difficult to connect the first liquid cooling head 43, and at this time, the heat generated by the lens system 113 can be accumulated in the optical engine 1. In order to avoid the influence of the temperature inside the optical engine 1 caused by other heat generating devices on the optical performance of the optical engine 1, when the airflow near the heat dissipation plate 3 is caused to flow by the heat dissipation fan 5, the airflow inside the housing 12 included in the optical engine 1 may also be caused to flow.

As shown in fig. 12, the optical engine 1 includes an optical engine body 11 and a housing 12; the rear side of the housing 12 and at least one side in the width direction of the projection screen 2 are provided with vent holes 121, the optical engine body 11 is located in the housing 12, the light beams emitted from the optical engine body 11 penetrate through the light-transmitting area, and at least one vent hole 121 of the plurality of vent holes 121 is provided with a heat radiation fan 5.

The optical engine body 11 includes a light source system 111, an illumination system 112, and a lens system 113, the light source system 111, the illumination system 112, and the lens system 113 are located in the housing 12, and a light emitting side of the lens system 113 faces a light transmitting area of the housing 12. The heat dissipation fan 5 is an exhaust fan, or the heat dissipation fan 5 is an air suction fan, or the heat dissipation fan 5 includes an exhaust fan and an air suction fan. At this time, the vent 121 with the exhaust fan is an air outlet 123, and the vent 121 with the suction fan is an air inlet 122.

Next, the airflow formed in the housing 12 included in the optical engine 1 will be explained.

In some embodiments, as shown in fig. 13, the housing 12 has a ventilation hole 121 at a first side in the width direction of the projection screen 2 as an air inlet 122, and the housing 12 has a ventilation hole 121 at a second side in the width direction and a backside of the housing 12 as an air outlet 123. Thus, under the action of the heat dissipation fan 5, the air flow entering along the first side of the housing 12 and exiting along the second side of the housing 12 and the back side of the housing 12 can be promoted. I.e. to form an air flow along the first side of the housing 12 towards the heat spreader plate 3 and an air flow along the first side of the housing 12 towards the second side of the housing 12. In combination with the structure of the connecting frame 8, the airflow flowing to the heat dissipation plate 3 is discharged upward along the airflow path formed by the connecting frame 8.

In other embodiments, as shown in fig. 14, the ventilation holes 121 of the housing 12 on both sides of the projection screen 2 in the width direction are air inlets 122, and the ventilation holes 121 on the back side of the housing 12 are air outlets 123. Thus, under the action of the heat dissipation fan 5, air can be induced to enter along the two sides of the housing 12, and air flow can be induced to exit along the back side of the housing 12. I.e. to form an air flow along a first side of the housing 12 towards the heat sink 3 and an air flow along a second side of the housing 12 towards the heat sink 3. In combination with the structure of the connecting frame 8, the airflow flowing to the heat dissipation plate 3 is discharged upward along the airflow path formed by the connecting frame 8.

In still other embodiments, as shown in fig. 15, the ventilation hole 121 on the back side of the housing 12 is an air inlet 122, and the ventilation hole 121 on at least one side of the housing 12 in the width direction of the projection screen 2 is an air outlet 123. Thus, under the action of the heat dissipation fan 5, the air can be induced from the back side of the housing 12 and exhausted along at least one side of the housing 12. I.e., to create a flow of air along the back side of the housing 12 to at least one side of the housing 12. The airflow can drive the airflow near the heat dissipation plate 3 to flow, and in combination with the structure of the connection frame 8, the airflow can enter the housing 12 downward along the airflow channel formed by the connection frame 8.

In still other embodiments, as shown in fig. 16, the back side of the housing 12 and the ventilation hole 121 of the housing 12 on the first side of the projection screen 2 in the width direction are air inlets 122, and the ventilation hole 121 of the housing 12 on the second side of the projection screen 2 in the width direction is air outlets 123. Thus, under the action of the heat dissipation fan 5, the air flow can be promoted to enter from the back side of the casing 12 and the first side of the casing 12 and to exit from the second side of the casing 12. I.e., to create an airflow along the back side of the housing 12 toward the second side of the housing 12 and an airflow along the first side of the housing 12 toward the second side of the housing 12. Wherein, the airflow flowing to the second side of the housing 12 along the back side of the housing 12 can drive the airflow near the heat dissipation plate 3 to flow, and in combination with the structure of the connection frame 8, the airflow can enter the housing 12 downward along the airflow channel formed by the connection frame 8.

In the embodiment of the present application, as shown in fig. 17, the laser projection apparatus includes a functional block 7, and the functional block 7 includes a control main board 71, a display board 72, and a power supply board 73; the control main board 71 is electrically connected with the display board 72, the display board 72 is electrically connected with the optical engine 1, and the power board 73 is electrically connected with the control main board 71, the display board 72 and the optical engine 1 respectively; the control main board 71, the display board 72 and the power supply board 73 are used to cooperate with the optical engine 1 to emit light beams.

The control main board 71 is a Television (TV) main board, and the control main board 71 has an external port for connecting a computer, a mobile phone, a flash disk, and the like. In this way, the control main board 71 can receive audio and video signals transmitted by a computer, a mobile phone, a flash disk, and the like, decode the audio and video signals to obtain video signals, and transmit the video signals to the display panel 72. The display panel 72 receives the video signal, converts the video signal into a driving signal, and transmits the driving signal to the DMD panel included in the optical engine 1, so that the DMD panel drives the micromirrors on the DMD to deflect based on the driving signal, so that the DMD emits light beams onto the projection screen 2, and the display of the picture is realized on the projection screen 2. The power board 73 can output a voltage or current driving signal, thereby facilitating power supply to the control main board 71, the display board 72, the optical engine 1, and the like.

When the control main board 71, the display board 72 and the power board 73 cooperate with the optical engine 1 to emit light beams, the control main board 71, the display board 72 and the power board 73 inevitably generate heat, that is, the control main board 71, the display board 72 and the power board 73 included in the functional component 7 are easily heat-generating devices. Therefore, in addition to heat dissipation of the heat generating device included in the optical engine 1, heat dissipation of the heat generating device included in the functional component 7 is required.

Since the distance between the optical engine 1 and the control motherboard 71 and the power board 73 included in the functional module 7 is not limited, that is, the distance between the optical engine 1 and the control motherboard 71 and the power board 73 can be increased appropriately, as shown in fig. 17, the control motherboard 71 and the power board 73 can be disposed outside the optical engine 1, that is, the control motherboard 71 and the power board 73 are disposed outside the housing 12 included in the optical engine 1, and thus, the natural heat dissipation of the control motherboard 71 and the power board 73 can be realized. In addition, by providing the control main board 71 and the power supply board 73 outside the optical engine 1, the volume of the optical engine 1 can be further reduced.

When the control main board 71 and the power board 73 are disposed outside the optical engine 1, in order to avoid interference of electromagnetic signals, the control main board 71 includes the housing 12 and the control main board 71 body, the power board 73 includes the housing 12 and the power board 73 body, and the control main board 71 body is connected with the corresponding housing 12 in a heat-conducting manner, and the power board 73 body is connected with the corresponding housing 12 in a heat-conducting manner, so that an electromagnetic shielding effect is achieved through the housing 12, and heat dissipation of the control main board 71 body and the power board is ensured.

Since the distance between the display panel 72 and the DMD included in the optical engine 1 may not be too far, for this reason, as shown in fig. 17, the display panel 72 needs to be disposed in the optical engine 1, that is, the display panel 72 is disposed in the housing 12 included in the optical engine 1. In this way, for the display panel 72 located in the optical engine 1, the heat dissipation of the display panel 72 can be realized by adding the heat dissipation fan 5 as described above.

In the embodiment of the application, the optical engine and the projection screen are integrally connected through the connecting frame, so that the problem of relative displacement of the optical engine and the projection screen can be avoided, and the projection effect of the laser projection equipment is ensured; the heat generated by the optical engine can be conducted to the heat dissipation plate through the heat conduction structure, and then the heat dissipation is carried out through the heat dissipation plate, so that the heat dissipation of the optical engine is realized, the problem that the temperature of the optical engine is higher due to the heat accumulation generated by the optical engine is avoided, and the optical performance of the optical engine is ensured; when the heat dissipation plate dissipates heat, the flow of air flow near the heat dissipation plate is accelerated through the heat dissipation fan, and the heat dissipation effect is improved; and the heat dissipation fan can dissipate the heat of other heating devices included in the optical engine, so that the problem of temperature rise of the optical engine is further avoided. In addition, the mode of radiating through the radiating plate cancels the arrangement of a radiating system in the optical engine, and reduces the volume of the optical engine.

The above description is only illustrative of the embodiments of the present application and is not intended to limit the embodiments of the present application, and any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present application should be included in the scope of the embodiments of the present application.

Claims (11)

1. A laser projection device, characterized in that the laser projection device comprises:

an optical engine to emit a light beam;

the projection screen is used for receiving the light beam to display a picture;

the heat dissipation plate is positioned on the back of the projection screen;

the heat conduction structure is respectively connected with the heat dissipation plate and the optical engine, and is used for transferring heat generated by the optical engine to the heat dissipation plate so as to dissipate heat through the heat dissipation plate;

a heat dissipation fan configured to drive an airflow near the heat dissipation plate to flow.

2. The laser projection device of claim 1, wherein the heat dissipation plate comprises a plurality of fins and heat pipes, and the heat conducting structure comprises a circulation line, a circulation pump, and a first liquid cooling head;

the heat pipe is coiled and penetrates through the plurality of radiating fins, the circulating pump and the first liquid cooling head are connected in series on the circulating pipeline, and two ends of the heat pipe are communicated with two ends of the circulating pipeline;

the first liquid cooling head is connected with the optical engine, the circulating pump is used for promoting the cooling liquid to circularly flow in the circulating pipeline and the heat pipe, and the heat generated by the optical engine is conducted to the plurality of radiating fins through the first liquid cooling head and the cooling liquid.

3. The laser projection device as claimed in claim 2, wherein the heat conducting structure further comprises a liquid replenishment tank, the liquid replenishment tank being in communication with the circulation line, the liquid replenishment tank being configured to replenish the circulation line with a cooling liquid.

4. The laser projection device as claimed in claim 3, wherein the fluid replacement tank has a pressure booster therein for adjusting a pressure at an outlet end of the fluid replacement tank.

5. The laser projection device of claim 2, wherein the optical engine comprises a plurality of heat generating devices, each of the plurality of heat generating devices having the first liquid cooling head coupled thereto.

6. The laser projection apparatus as claimed in claim 5, wherein the first liquid cooling heads connected to the plurality of heat generating devices are connected in series and then connected in series to the circulation line.

7. The laser projection device of claim 6, wherein the plurality of heat generating devices includes a light source system and an illumination system, the first liquid cooling head to which the light source system is connected being located upstream of the first liquid cooling head to which the illumination system is connected.

8. The laser projection apparatus as claimed in claim 5, wherein the first liquid cooling heads connected to the plurality of heat generating devices are connected in parallel and then connected in series to the circulation line.

9. The laser projection device of claim 1, further comprising a thermal insulation layer between the heat sink plate and the projection screen.

10. The laser projection device of claim 1, wherein the laser projection device comprises functional components including a control motherboard, a power board, and a display board, the display board being located within the optical engine, the control motherboard and the power board being located outside the optical engine.

11. The laser projection device of claim 1 or 10, wherein the optical engine comprises an optical engine body and a housing;

the dorsal part of casing with at least one side of projection screen's width direction has the ventilation hole, the optical engine body is located in the casing, the light beam of optical engine body outgoing sees through the printing opacity district of casing, and is a plurality of at least one ventilation hole in the ventilation hole has radiator fan.

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