CN216956649U - Laser projection device - Google Patents

Abstract

The utility model discloses laser projection equipment, which is used for solving the problem of low heat dissipation efficiency of the existing laser projection equipment. The laser projection apparatus includes: a light source comprising at least one laser; an optical engine including a light valve; the at least one first liquid cooling head is attached to the back surface of the at least one laser; the second liquid cooling head is attached to the back surface of the light valve; a liquid cooling plate having a liquid inlet and a liquid outlet; the two ends of the first cooling pipeline are respectively communicated with the liquid inlet and the liquid outlet, and at least one first liquid cooling head is communicated in the first cooling pipeline; and the two ends of the second cooling pipeline are respectively communicated with the liquid inlet and the liquid outlet, and the second liquid cooling head is communicated in the second cooling pipeline. According to the laser projection equipment provided by the utility model, the temperature difference between the cooling liquid and the heat source component is larger in a parallel connection mode, the heat exchange efficiency is higher, the cooling effect is favorably ensured, and the reliability of the whole laser projection equipment is further ensured.

Description

Laser projection device

Technical Field

The utility model relates to the technical field of projection display, in particular to laser projection equipment.

Background

With the development of laser television technology, more and more users begin to use laser television products. The laser television includes a laser projection device and a projection screen. The laser projection equipment comprises a light source, an optical machine, a lens and other components, wherein light emitted by the light source can be irradiated on the surface of a light valve in the optical machine after being integrated and filtered. The light valve can modulate light emitted by the light source to form a projection light beam, and the lens can project the projection light beam onto the projection screen, so that human eyes can watch a projection picture from the screen. In this process, the light source, the optical engine, the lens, and other components generate a large amount of heat, which affects the service life of the laser projection apparatus.

In the related art, one way of dissipating heat from a heat source component inside a laser projection apparatus is liquid-cooled heat dissipation, in which a liquid cooling head in contact with a heat source component such as a light source and an optical device is connected in series to a circulation pipeline for heat dissipation, so that the temperature of a cooling liquid flowing through the liquid cooling head at the downstream of the series pipeline is high, resulting in low heat dissipation efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide laser projection equipment, which is used for solving the problem of low heat dissipation efficiency of the existing laser projection equipment.

In order to achieve the purpose, the utility model provides the following technical scheme:

some embodiments of the utility model provide a laser projection apparatus including a light source, an optical engine, at least one first liquid-cooled head, a second liquid-cooled head, a liquid-cooled plate, a first cooling conduit, and a second cooling conduit. The light source comprises at least one laser. The light engine includes a light valve. The at least one first liquid cooling head is attached to the back of the at least one laser. The second liquid cooling head is attached to the back of the light valve. The liquid cooling plate has a liquid inlet and a liquid outlet, and the liquid cooling plate is used for carrying out the heat exchange. The two ends of the first cooling pipeline are respectively communicated with the liquid inlet and the liquid outlet, and the at least one first liquid cooling head is communicated with the first cooling pipeline. The two ends of the second cooling pipeline are respectively communicated with the liquid inlet and the liquid outlet, and the second liquid cooling head is communicated with the second cooling pipeline.

In some embodiments, the number of the first liquid cooling heads is multiple, and the multiple first liquid cooling heads are connected in series in the first cooling pipeline. The number of the lasers is multiple; a first liquid-cooled head is attached to the back of a laser. Or, among the plurality of lasers, at least two lasers with flush light-emitting surfaces form a group of laser groups, and one first liquid cooling head is attached to the back surfaces of the group of laser groups.

In some embodiments, the laser projection device further comprises a circuit board assembly, at least one third liquid cooling head, and a third cooling line. The circuit board assembly includes at least one circuit board. At least one third liquid cooling head is attached to the circuit board assembly. The two ends of the third cooling pipeline are respectively communicated with the liquid inlet and the liquid outlet, and at least one third liquid cooling head is communicated in the third cooling pipeline.

In some embodiments, the number of the third liquid cooling heads is multiple, and multiple third liquid cooling heads are connected in series in the third cooling pipeline. The number of the circuit boards is multiple; a third liquid cooling head is attached to a circuit board. Or, in the plurality of circuit boards, at least two stacked circuit boards form a group of circuit board groups, and one third liquid cooling head is attached to the group of circuit board groups.

In some embodiments, the laser projection apparatus further comprises a first circulation pump, a second circulation pump, and a third circulation pump. The first circulating pump is communicated with the first cooling pipeline. The second circulating pump is communicated with the second cooling pipeline. The third circulating pump is communicated with the third cooling pipeline.

In some embodiments, the laser projection apparatus further comprises a first temperature detection device, a second temperature detection device, a third temperature detection device, and a controller. The first temperature detection device is mounted on the light source and used for detecting the temperature of at least one laser. The second temperature detection device is arranged on the optical machine and used for detecting the temperature of the light valve. The third temperature detection device is arranged on the circuit board assembly and used for detecting the temperature of at least one circuit board. The controller is electrically connected with the first temperature detection device, the second temperature detection device, the third temperature detection device, the first circulating pump, the second circulating pump and the third circulating pump; the controller is used for adjusting the flow rates of the first circulating pump, the second circulating pump and the third circulating pump according to the temperatures detected by the first temperature detection device, the second temperature detection device and the third temperature detection device.

In some embodiments, the laser projection device further comprises: a housing including a bottom case; the light source, the optical machine, the circuit board assembly and the liquid cooling plate are all arranged in the shell; wherein, the liquid cooling board is connected with the bottom shell and is arranged in a stacking way, and the light source, the optical machine and the circuit board assembly are arranged on the liquid cooling board.

In some embodiments, the liquid inlet of the liquid-cooled plate comprises a first liquid inlet, a second liquid inlet, and a third liquid inlet; the liquid outlets of the liquid cooling plate comprise a first liquid outlet, a second liquid outlet and a third liquid outlet; the two ends of the first cooling pipeline are respectively communicated with the first liquid inlet and the first liquid outlet; two ends of the second cooling pipeline are respectively communicated with the second liquid inlet and the second liquid outlet; and two ends of the third cooling pipeline are respectively communicated with the third liquid inlet and the third liquid outlet. The liquid cooling plate comprises a first circulation structure, a second circulation structure and a third circulation structure. The first circulation structure is communicated with the first liquid inlet and the first liquid outlet. The second circulation structure is communicated with the second liquid inlet and the second liquid outlet. The third circulation structure is communicated with the third liquid inlet and the third liquid outlet.

In some embodiments, the laser projection device further comprises a plurality of heat sink fins, and/or a radiation coating. A plurality of radiating fins are arranged on the surface of the liquid cooling plate, which is away from the light source and the optical machine. The radiation coating is arranged on the surface of the liquid cooling plate, which is away from the light source and the optical machine.

In some embodiments, the housing further includes a first sidewall and a second sidewall both connected to the bottom case, the first sidewall and the second sidewall are disposed opposite to each other, the first sidewall has a first ventilation opening, and the second sidewall has a second ventilation opening. The laser projection apparatus further includes: and the fan assembly is arranged in the shell and used for driving the airflow to flow from one of the first ventilation opening and the second ventilation opening to the other.

In some embodiments, the laser projection device further comprises: and the lens is closer to the second ventilation opening relative to the light source. The fan assembly includes a first fan, and/or a second fan. The first fan is arranged between the light source and the first side wall, and the air outlet side of the first fan faces the first ventilation opening. The second fan is arranged between the lens and the second air vent, and the air outlet side of the second fan faces the lens.

The laser projection equipment provided by the utility model has the following beneficial effects:

in summary, according to the laser projection apparatus provided by the present invention, the at least one first liquid cooling head is attached to the back surface of the at least one laser, so that the first liquid cooling head can exchange heat with the laser; the second liquid cooling head is attached to the back surface of the light valve of the optical machine, so that the second liquid cooling head can exchange heat with the light valve; the laser cooling device comprises a first cooling pipeline, at least one first liquid cooling head, a second cooling pipeline, a circulating loop and a laser, wherein the at least one first liquid cooling head is communicated with the first cooling pipeline, and two ends of the first cooling pipeline are respectively communicated with a liquid inlet and a liquid outlet of a liquid cooling plate, so that the liquid cooling plate, the first cooling pipeline and the at least one first liquid cooling head form a circulating loop to cool the laser in a heat dissipation manner; through communicating the second liquid cooling head in the second cooling pipeline, the both ends of second cooling pipeline are linked together with the inlet and the liquid outlet of liquid cooling board respectively for liquid cooling board, second cooling pipeline and second liquid cooling head form another circulation circuit, dispel the heat and cool off the light valve. Therefore, the cooling liquid flowing through the first liquid cooling head and the cooling liquid flowing through the second liquid cooling head are low-temperature cooling liquid directly coming from the liquid cooling plate, the laser is cooled for the cooling liquid firstly, the serial-type heat dissipation mode for cooling the light valve is adopted, the parallel-type mode is adopted in the application, the temperature difference between the cooling liquid and the light valve is large, the heat exchange efficiency is high, the cooling effect on the light valve is guaranteed, and the reliability of the whole laser projection equipment is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of a laser television according to the prior art;

FIG. 2 is a schematic diagram of a laser television according to some embodiments of the present invention;

FIG. 3 is a schematic diagram of a portion of a laser projection device according to some embodiments of the present invention;

FIG. 4 is a schematic diagram of a partial structure of a laser projection device according to further embodiments of the present invention;

FIG. 5 is a schematic diagram of a portion of a laser projection device according to further embodiments of the present invention;

FIG. 6 is a schematic diagram of a portion of a laser projection device according to further embodiments of the present invention;

FIG. 7 is a schematic diagram of a portion of a laser projection device in accordance with still other embodiments of the utility model;

FIG. 8 is a schematic diagram of a liquid-cooled panel according to some embodiments of the utility model;

FIG. 9 is a schematic diagram of a portion of a laser projection device according to further embodiments of the present invention;

fig. 10 is a schematic diagram of a liquid cooling head according to some embodiments of the utility model.

Reference numerals: 100-a laser projection device; 1-a light source; 101-a laser; 101A-a laser group; 2-a light machine; 201-a light valve; 3-a first liquid-cooled head; 301-S type channel structure; 4-a second liquid cooling head; 5-liquid cooling plate; 501-liquid inlet; 5011-a first inlet; 5012-a second liquid inlet; 5013-third liquid inlet; 502-a liquid outlet; 5021-a first liquid outlet; 5022-a second liquid outlet; 5023-a third liquid outlet; 6-a first cooling circuit; 7-a second cooling circuit; 8-lens; 9-a circuit board assembly; 901-a circuit board; 901A circuit board group; 10-a third liquid-cooled head; 11-a third cooling circuit; 12-a first circulation pump; 13-a second circulation pump; 14-a third circulation pump; 15-a housing; 1501-a bottom shell; 1502-front sidewall; 1504-left sidewall; 15041-a first vent; 1506-top case; 16-heat dissipation fins; 17-a fan assembly; 1701-a first fan; 1702-a second fan; 200-projection screen.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element identified by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

In the embodiments of the present application, the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The laser television is a projection display device which adopts a laser light source as a display light source, is matched with a front projection display technology for imaging, is provided with a special projection screen and can receive broadcast television programs or internet television programs. Referring to fig. 1, the laser television includes a projection apparatus 100 and a projection screen 200. The projection apparatus 100 can emit a laser beam to the projection screen 200, and the projection screen 200 reflects the laser beam to display a picture.

The projection screen 200 may be an optical screen, for example, the projection screen may be composed of a support plate and a membrane located on the support plate, and the membrane may be an optical membrane mainly including a fresnel lens layer, for example, the membrane may include a diffusion layer, a substrate layer, and a fresnel lens layer (or may also include a substrate layer, a diffusion layer, and a fresnel lens layer) stacked in sequence in a direction away from the laser projection apparatus 100; the substrate layer is a transparent film layer, when an image is displayed, light beams are emitted from the laser projection device 100, when the light beams pass through the diffusion layer, the light beams are dispersed by the diffusion layer, and then the light beams are reflected on the surface of the Fresnel lens layer, so that a user can view the image. As another example, the supporting plate may be bonded to the membrane through an adhesive layer to fix and flatten the membrane, and the adhesive layer may be a double-sided adhesive layer or a glue layer.

When the laser projection apparatus 100 is in operation, the heat source components (the light source 1, the optical engine 2, and the like) inside the apparatus generate a large amount of heat, which affects the service life of the laser projection apparatus 100. In the related art, one way of dissipating heat from the heat source components inside the laser projection apparatus 100 is liquid-cooled heat dissipation, in which liquid cooling heads in contact with the heat source components such as the light source 1 and the optical engine 2 are connected in series to a circulation pipeline for heat dissipation, so that the temperature of the cooling liquid flowing through the liquid cooling heads at the downstream of the series pipeline is high, which results in low heat dissipation efficiency for the corresponding components.

Based on this, referring to fig. 3, some embodiments of the present invention provide a projection apparatus 100, which includes a light source 1, an optical engine 2, at least one first liquid cooling head 3, a second liquid cooling head 4, a liquid cooling plate 5, a first cooling pipeline 6, and a second cooling pipeline 7.

In order to emit a laser beam and display a picture on the projection screen 200, the laser projection apparatus 100 may further include a lens 8, the light source 1, the optical engine 2, and the lens 8 are sequentially connected along a beam transmission direction, and a pattern formed by sequentially connecting the light source 1, the optical engine 2, and the lens 8 may be L-shaped, so that the structure of the laser projection apparatus 100 may be more compact, and it is convenient to divide the interior of the laser projection apparatus 100 into two regions, where the region where the light source 1, the optical engine 2, and the lens 8 are located and the region facing the L-shaped opening are optical regions, and the back side of the L-shaped opening may be provided with devices such as a circuit board, which are electrical regions, and such division may separate the optical regions from the electrical regions, it should be noted that components in the optical regions are also generally provided with a driving circuit, but because the size of components compared with the circuit regions such as the circuit board is smaller, the complexity is also low. Thus, the interior of the laser projection apparatus 100 is divided into different areas, which is not only convenient for assembling and debugging the whole apparatus, but also convenient for the respective design requirements of the components in the optical area and the components in the electrical area, such as heat dissipation, routing, electromagnetic testing, and the like.

When the laser projection apparatus 100 is in operation, the light source 1 may provide a laser beam to the optical machine 2, and the optical machine 2 may modulate the laser beam provided by the light source 1 and project the modulated laser beam onto the lens 8, so that the laser beam is emitted from the lens 8 to the projection screen 200 and is reflected on the projection screen 200, so that a user can view an image.

The light source 1 includes at least one laser 101, and for example, the light source 1 may be a three-color light source, where the three-color light source includes a red laser, a blue laser, a green laser, and a plurality of optical lenses, and the plurality of optical lenses may homogenize and converge the laser beam. Alternatively, the light source 1 may also be a non-three-color laser light source, i.e. the light source 1 may be a monochromatic light source or a two-color light source. The monochromatic light source may use a blue laser to excite the phosphor to produce another two colors of primary light (e.g., red and green fluorescent light), or to produce more than two colors of fluorescent light. The two-color light source can adopt a blue laser and a red laser, and the blue laser excites the fluorescent powder to generate green fluorescence (or fluorescence of other colors).

The optical engine 2 may include a plurality of lens groups (not shown in the drawings) and a light valve 201, for example, the lens groups are a Total Internal Reflection (TIR) prism and a Reverse Total Internal Reflection (RTIR) mirror, and are configured to form an illumination light path, so that an illumination light beam may be incident to a core device in the optical engine 2, that is, the light valve 201, and the light valve 201 is configured to modulate the light beam, and make the modulated light beam incident to a lens group of the lens 8 for imaging. On this basis, the light valve 201 may be a Digital Micromirror chip (DMD), for example.

Illustratively, the lens 8 may be an ultra-short-focus projection lens, which generally includes a refractive lens group and a reflective lens group, and is configured to receive the light beam reflected by the DMD for imaging. The ultra-short-focus projection lens corrects and amplifies the imaging light beam, and makes the imaging light beam incident to the projection screen 200 for imaging after reflection, and the ultra-short-focus projection device can realize a smaller projection ratio (the projection ratio is a ratio of a vertical distance L (shown in fig. 1) from a central point of a light emitting surface of the lens 8 to a plane where the projection screen 200 is located to a width W (shown in fig. 2) of a display area on the projection screen 200, wherein the width of the display area refers to a size of the display area along a horizontal direction), for example, the width is less than or equal to 0.3, so that the projection device 100 can be closer to the projection screen 200 when projecting an image, so as to reduce a space occupied by the whole laser television.

To implement the functions of the laser television, the laser projection apparatus 100 may further include a circuit board assembly 9, the circuit board assembly 9 may include a plurality of circuit boards 901, and the plurality of circuit boards 901 may include a power supply board, a TV board, a control board, a display board, and the like, for example. The plurality of circuit boards may be collectively disposed in the projection apparatus 100, for example, the plurality of circuit boards may be stacked in the electrical region, or a part of the plurality of circuit boards may be stacked in the electrical region and another part may be disposed at the side wall of the laser projection apparatus 100.

Based on this, the at least one first liquid cooling head 3 is attached to the back surface of the at least one laser 101 in order to exchange heat with the laser 101 in the light source 1. For example, as described above, the number of the lasers 101 may be one, and the number of the first liquid cooling heads 3 may also be one (as shown in fig. 4), and the heat exchange surface of the first liquid cooling head 3 is attached to the back surface of the lasers 101 (where the back surface is a surface on the back side of the light exit surface of the lasers 101); as another example, the number of the lasers 101 may be multiple, in this case, the number of the first liquid cooling heads 3 may be one, and the heat exchange surface of one first liquid cooling head 3 is attached to the back surfaces of the multiple lasers 101 at the same time; alternatively, the number of the first liquid cooling heads 3 may also be multiple, and the number of the first liquid cooling heads 3 may be the same as the number of the lasers 101, and may be in one-to-one correspondence (as shown in fig. 5), for example, the number of the first liquid cooling heads 3 may be less than the number of the lasers 101, that is, a part of the heat exchange surface of the first liquid cooling head 3 is simultaneously attached to the back surfaces of two or more lasers 101 (as shown in fig. 3 and fig. 6), and both the heat exchange surfaces can radiate the lasers 101. As another example, the heat exchange surface of the first liquid cooling head 3 may be directly contacted and attached to the laser 101; alternatively, a heat-conducting silicone grease can be filled between the heat exchange surface of the first liquid-cooling head 3 and the laser 101 to increase the heat exchange efficiency.

Similarly, the second liquid cooling head 4 is attached to the back surface of the light valve 201 in order to exchange heat with the light valve 201 in the optical bench 2. The back of the light valve 201 refers to a surface on the back side of the light emitting surface of the light valve 201. For example, the heat exchange surface of the second liquid cooling head 4 may be directly attached to the back surface of the light valve 201 in a contact manner; alternatively, heat-conducting silicone grease may be filled between the heat exchange surface of the second liquid cooling head 4 and the light valve 201 to increase the heat exchange efficiency.

In order to discharge heat generated by the heat source components inside the laser projection apparatus 100 to the outside of the apparatus, the liquid cooling plate 5 has a liquid inlet 501 and a liquid outlet 502, and the liquid cooling plate 5 is used for heat exchange. The two ends of the first cooling pipeline 6 are respectively communicated with the liquid inlet 501 and the liquid outlet 502, and at least one first liquid-cooling head 3 is communicated with the first cooling pipeline 6, namely the liquid inlet and the liquid outlet of the first liquid-cooling head 3 are respectively communicated with the liquid outlet 502 and the liquid inlet 501 of the liquid cooling plate 5 through the first cooling pipeline 6. The two ends of the second cooling pipeline 7 are respectively communicated with the liquid inlet 501 and the liquid outlet 502, the second liquid cooling head 4 is communicated with the second cooling pipeline 7, namely, the liquid inlet and the liquid outlet of the second liquid cooling head 4 are respectively communicated with the liquid outlet 502 and the liquid inlet 501 of the liquid cooling plate 5 through the second cooling pipeline 7.

Therefore, when the cooling liquid in the liquid cooling plate 5 flows through the first liquid cooling head 3 through the first cooling pipeline 6, the cooling liquid exchanges heat with the laser 101 through the heat exchange surface of the first liquid cooling head 3, takes away heat generated by the laser 101, flows back to the liquid cooling plate 5 for cooling, and then continuously circulates to continuously dissipate heat and cool the laser 101. Similarly, when the cooling liquid in the liquid cooling plate 5 flows through the second liquid cooling head 4, the heat exchange surface of the second liquid cooling head 4 exchanges heat with the light valve 201, the heat generated by the light valve 201 is taken away, and then the cooling liquid flows back to the liquid cooling plate 5 to cool and cool, and then the circulation is continued to continuously cool and dissipate the heat of the light valve 201. As a result, the first cooling line 6 and the second cooling line 7 form two parallel cooling branches, and the heat source components are cooled by heat dissipation without being affected by each other.

For example, the liquid cooling plate 5 may exchange heat with air outside the laser projection apparatus 100 to cool the cooling liquid in the liquid cooling plate 5; alternatively, the laser projection apparatus 100 may also include a refrigeration device, and the liquid cooling plate 5 may perform heat exchange with the refrigeration device to cool the cooling liquid in the liquid cooling plate 5.

In summary, according to the laser projection apparatus 100 provided by the present invention, the at least one first liquid cooling head 3 is attached to the back surface of the at least one laser 101, so that the first liquid cooling head 3 can exchange heat with the laser 101; the second liquid cooling head 4 is attached to the back surface of the light valve 201 of the optical machine 2, so that the second liquid cooling head 4 can exchange heat with the light valve 201; the at least one first liquid cooling head 3 is communicated with the first cooling pipeline 6, and two ends of the first cooling pipeline 6 are respectively communicated with the liquid inlet 501 and the liquid outlet 502 of the liquid cooling plate 5, so that the liquid cooling plate 5, the first cooling pipeline 6 and the at least one first liquid cooling head 3 form a circulation loop to cool the laser 101 in a heat dissipation manner; through communicating second liquid cooling head 4 in second cooling pipeline 7, the both ends of second cooling pipeline 7 are linked together with inlet 501 and liquid outlet 502 of liquid cooling plate 5 respectively for liquid cooling plate 5, second cooling pipeline 7 and second liquid cooling head 4 form another circulation circuit, cool off the light valve 201 that dispels the heat. From this can know, the coolant liquid in the first liquid cooling head 3 of flowing through and the coolant liquid in the second liquid cooling head 4 of flowing through all are the cryogenic cooling liquid that directly comes from in the liquid cooling board 5, cool off laser instrument 101 earlier for the coolant liquid, carry out refrigerated serial-type heat dissipation mode to light valve 201, this application is through the mode of parallel, make the difference in temperature between coolant liquid and the light valve 201 great, heat exchange efficiency is higher, be favorable to guaranteeing the cooling effect to light valve 201, and then guarantee the reliability of laser projection equipment 100 complete machines.

Referring to fig. 3 and 5, in some embodiments, the number of the first liquid-cooling headers 3 is plural, and a plurality of the first liquid-cooling headers 3 are connected in series in the first cooling line 6. The number of the lasers 101 is multiple, and one first liquid cooling head 3 is attached to the back face of one laser 101; or, in the multiple lasers 101, at least two lasers 101 with flush light-emitting surfaces form a group of laser groups 101A, and one first liquid cooling head 3 is attached to the back surfaces of the group of laser groups 101A. In this way, since the upper limit of the operating temperature of the different lasers 101 is close and the thermal power consumption is close, the heat dissipation requirements are also close, so that the same flow of the cooling liquid can be adopted to sequentially perform heat dissipation and cooling, that is, the plurality of first liquid cooling heads 3 are connected in series, which not only enables each laser 101 to achieve the purpose of heat dissipation and maintain the normal operation of the laser 101, but also simplifies the connection of the cooling pipeline as much as possible, so as to save the space inside the laser projection apparatus 100.

For example, as shown in fig. 5, the number of the first liquid cooling heads 3 may be 2, the number of the lasers 101 may be two, the light emitting surfaces of the two lasers 101 are arranged at 90 °, at this time, the heat exchange surface of one first liquid cooling head 3 is attached to the back surface of one laser 101, and the two first liquid cooling heads 3 are connected in series. Of course, when the light emitting surfaces of the two lasers 101 are flush, the heat exchange surface of one first liquid cooling head 3 may be attached to the back surface of one laser 101, and the two first liquid cooling heads 3 are connected in series.

For example, as shown in fig. 3, the number of the first liquid cooling heads 3 may be 2, the number of the lasers 101 is 3, in three lasers 101, the light emitting surfaces of two lasers 101 are aligned to form a group of laser groups 101A, the light emitting surface of the laser group 101A and the light emitting surface of the third laser 101 are arranged at 90 °, at this time, the heat exchange surface of one first liquid cooling head 3 is attached to the back surface of one group of laser groups 101A, and the heat exchange surface of the other first liquid cooling head 3 is attached to the back surface of the third laser 101. Thus, the first liquid cooling head 3 can simultaneously carry out heat dissipation and cooling on the lasers 101 of the laser group 101A, and the design and connection of cooling pipelines are simplified.

Referring to fig. 3-6, in some embodiments, the laser projection apparatus further includes the aforementioned circuit board assembly 9, at least one third liquid-cooled head 10, and a third cooling conduit 11. The circuit board assembly 9 includes at least one circuit board 901. At least one third liquid cooling head 10 is attached to the circuit board assembly 9. The two ends of the third cooling pipeline 11 are respectively communicated with the liquid inlet 501 and the liquid outlet 502, and at least one third liquid-cooling head 10 is communicated with the third cooling pipeline 11, that is, the liquid inlet and the liquid outlet of the third liquid-cooling head 10 are respectively communicated with the liquid outlet 502 and the liquid inlet 501 of the liquid-cooling plate 5 through the third cooling pipeline 11. So design, the coolant liquid that flows through in the third liquid cooling head 10 is the cryogenic cooling liquid that directly comes from in the liquid cooling board 5, cool off laser 101 earlier for the coolant liquid, cool off the light valve 201, carry out refrigerated serial-type heat dissipation mode to circuit board subassembly 9, this embodiment is through the mode of parallel for the difference in temperature between coolant liquid and the circuit board 901 is great, and heat exchange efficiency is higher, is favorable to guaranteeing the cooling effect to circuit board 901, and then guarantees the reliability of laser projection equipment 100 complete machine.

For example, as shown in fig. 4 to fig. 6, the number of the third liquid cooling head 10 may be one, the number of the circuit boards 901 in the circuit board assembly 9 may be multiple (for example, the number of the circuit boards 901 may be 3 or 4), multiple circuit boards 901 are stacked and fixed by one board, and a heat exchange surface of one third liquid cooling head 10 may be attached to the circuit board assembly 9 by way of attaching to the board to perform heat dissipation and cooling on the circuit board assembly 9. For example, the number of the third liquid cooling heads 10 may also be multiple, the number of the circuit boards 901 may also be multiple, and the heat exchange surfaces of the third liquid cooling heads 10 may be correspondingly attached to the circuit boards 901 one by one to dissipate heat and cool the circuit boards 901; alternatively, the circuit boards 901 may be grouped, and a heat exchange surface of one third liquid cooling head 10 is attached to one group of the circuit board groups 901 to perform heat dissipation and cooling on the circuit boards, which may be all applicable.

Referring to fig. 3, in some embodiments, the number of the third liquid cooling heads 10 is multiple, and a plurality of the third liquid cooling heads 10 are connected in series in the third cooling pipeline. The number of the circuit boards 901 is plural; a third liquid cooling head 10 is attached to a circuit board 901; alternatively, among the plurality of circuit boards 901, at least two circuit boards 901 stacked together form a group of circuit board groups 901A, and one third liquid cooling head 10 is attached to the group of circuit board groups 901A. In this way, since the upper limit of the working temperature of the different circuit boards 901 is close and the thermal power consumption is close, the heat dissipation requirements are also close, so that the same flow of the cooling liquid can be adopted to perform heat dissipation and cooling in sequence, that is, a plurality of third liquid cooling heads 10 are connected in series, which not only enables each circuit board 901 to achieve the purpose of heat dissipation and maintain the normal operation of the circuit board, but also simplifies the connection of the cooling pipelines as much as possible, so as to save the space inside the laser projection apparatus 100.

For example, the number of the third hydraulic cooling heads 10 may be 4, the number of the circuit boards 901 may be four (as described above, the circuit boards 901 may include a power board, a TV board, a control board, and a display board), and the four circuit boards 901 may be disposed in a distributed manner, where the heat exchange surface of one third hydraulic cooling head 10 is attached to one circuit board 901, and the four third hydraulic cooling heads 10 are connected in series. Of course, when the four circuit boards 901 are arranged in a concentrated manner, the heat exchange surface of one third liquid cooling head 10 can be attached to one circuit board 901, and the four third liquid cooling heads 10 are connected in series.

For example, the number of the third liquid cooling heads 10 may be 2, the number of the circuit boards 901 is 4, three circuit boards 901 of the four circuit boards 901 are stacked to form a group of circuit board groups 901A, the circuit board groups 901A and the fourth circuit board 901 are arranged in a dispersed manner, at this time, a heat exchange surface of one third liquid cooling head 10 is attached to one group of circuit board groups 901A, and a heat exchange surface of another third liquid cooling head 10 is attached to the fourth circuit board 901. Thus, one third liquid cooling head 10 can perform heat dissipation and cooling on the circuit boards 901 of the circuit board group 901A at the same time, and design and connection of cooling pipelines are simplified.

Referring to fig. 3, in some embodiments, the laser projection apparatus 100 further includes a first circulation pump 12, a second circulation pump 13, and a third circulation pump 14. The first circulation pump 12 communicates with the first cooling line 6. The second circulation pump 13 communicates with the second cooling line 7. The third circulation pump 14 communicates with the third cooling line 11. By the design, the cooling liquid with different flow rates can be output according to different power consumptions of the heat source parts attached to the liquid cooling heads on each cooling pipeline, different heat dissipation requirements of different heat source parts are met, and the cooling liquid is reasonably distributed and utilized.

It should be noted that, in other embodiments, a circulation pump may be disposed at the liquid inlet 501 or the liquid outlet 502 of the liquid cooling plate 5, and meanwhile, the cooling liquid is caused to flow through three different cooling pipelines, and the heat dissipation requirements of different heat source components are adapted by the difference design of the pipe diameters of the three cooling pipelines, which may also be applied.

In some embodiments, the laser projection apparatus 100 further includes a first temperature detection device (not shown), a second temperature detection device (not shown), a third temperature detection device (not shown), and a controller (not shown). A first temperature detection means is mounted on the light source 1 for detecting the temperature of the at least one laser 101. The second temperature detection device is mounted on the optical engine 2 and is used for detecting the temperature of the light valve 201. The third temperature detecting means is mounted on the circuit board assembly 9 for detecting the temperature of at least one circuit board 901. The controller is electrically connected with the first temperature detection device, the second temperature detection device, the third temperature detection device, the first circulating pump 12, the second circulating pump 13 and the third circulating pump 14. The controller is used for adjusting the flow rates of the first circulating pump 12, the second circulating pump 13 and the third circulating pump 14 according to the temperatures detected by the first temperature detection device, the second temperature detection device and the third temperature detection device. Therefore, the flow of the corresponding circulating pump can be automatically adjusted according to the temperature condition of the heat source component, so that the heat dissipation and cooling effects on the heat source component are ensured, and the reliability of the whole laser projection equipment 100 is further ensured.

For example, the first temperature detection means may be a thermocouple; when the number of the lasers 101 is one, the detection end of the thermocouple is connected to the back surface of the laser 101 to detect the temperature of the laser 101, and when the number of the lasers 101 is multiple, the detection end of the thermocouple may be connected to the back surface of the laser 101 with the minimum upper limit of the operating temperature according to the upper limit of the operating temperature of each laser 101 to detect the temperature of the laser 101.

Illustratively, the second temperature detecting device may be a thermocouple, which is connected to the back surface of the light valve 201 and detects the temperature thereof.

For example, the third temperature detecting device may be a thermocouple, the same as the temperature detection for the laser 101, and when the number of the circuit boards 901 is plural, the temperature of the circuit board 901 with the minimum upper operating temperature limit may be detected according to the upper operating temperature limit of each circuit board 901, of course, the number of the thermocouples may also be the same as the number of the circuit boards 901, and the detecting end of one thermocouple may be connected to one circuit board 901.

For example, the controller may adjust the flow rate of the corresponding circulation pump by setting a temperature threshold, for example, by subtracting 5 ℃ from the minimum working temperature of the heat source unit on each cooling pipeline, and when the corresponding temperature detected by the temperature detection device is less than the temperature threshold, the controller may control the corresponding circulation pump to decrease the flow rate, and when the corresponding temperature detected by the temperature detection device is greater than the temperature threshold, the controller may control the corresponding circulation pump to increase the flow rate.

For example, the controller may be a control chip disposed on a control board in the aforementioned circuit board 901.

Referring to fig. 2 and 7, in some embodiments, laser projection device 100 further includes: a housing 15. The housing 15 includes a bottom case 1501. The light source 1, the optical machine 2, the circuit board assembly 9 and the liquid cooling plate 5 are all arranged in the shell 15. Wherein, liquid cooling plate 5 is connected and range upon range of setting with drain pan 1501, and light source 1, ray apparatus 2 and circuit board assembly 9 set up on liquid cooling plate 5. Thus, the liquid cooling plate 5 can integrate the functions of heat dissipation and support, so that the area of the liquid cooling plate 5 is as large as possible, the heat dissipation effect is ensured, the support plate in the laser projection device 100 can be omitted, and the overall structure of the device is simplified.

Illustratively, a connecting seat may be disposed on the periphery of the liquid cooling plate 5, and the liquid cooling plate 5 is connected to the bottom case 1501 through a threaded connection.

Exemplarily, the bottom case 1501 may be provided with heat dissipation holes to ensure a heat exchange effect between the liquid cooling plate 5 and the external air, thereby ensuring a heat dissipation effect of the entire machine.

Illustratively, the housing 15 of the laser projection apparatus 100 may further include a front side wall 1502, a rear side wall (not shown), a left side wall 1504, a right side wall (not shown), and a top case 1506, where the four side walls are connected to the bottom case 1501 and the top case 1506 and enclose an accommodating cavity to accommodate various functional components. The top casing 1506 has a light exit opening for passing light beams emitted from the lens 8.

It should be noted that, in other embodiments, the liquid cooling plate 5 may also be located in the housing 15 and connected to one of the four sidewalls, and accordingly, the sidewall is provided with heat dissipation holes to ensure a heat exchange effect between the liquid cooling plate 5 and the air outside the apparatus, and the same may also be applied.

Referring to fig. 8, in some embodiments, liquid inlet 501 of liquid-cooled plate 5 includes a first liquid inlet 5011, a second liquid inlet 5012, and a third liquid inlet 5013. The liquid outlet 502 of the liquid cooling plate 5 includes a first liquid outlet 5021, a second liquid outlet 5022, and a third liquid outlet 5023. Two ends of the first cooling pipeline 6 are respectively communicated with the first liquid inlet 5011 and the first liquid outlet 5021. Two ends of the second cooling pipeline 7 are respectively communicated with the second liquid inlet 5012 and the second liquid outlet 5022. Both ends of the third cooling pipeline 10 are respectively communicated with a third liquid inlet 5013 and a third liquid outlet 5023. The liquid-cooled plate 5 includes a first flow-through structure 503, a second flow-through structure 504, and a third flow-through structure 505. The first flow-through structure 503 is in communication with the first inlet 5011 and the first outlet 5021. Second flow-through structure 504 is in communication with second inlet port 5012 and second outlet port 5022. The third flow-through structure 505 is in communication with a third fluid inlet 5013 and a third fluid outlet 5023.

So design, can make three cooling line form circulation circuit with solitary circulation structure respectively, prevent that three circulating pump from making the coolant liquid flow in the inner chamber of liquid cooling plate 5 simultaneously, cause the coolant liquid disorder in the liquid cooling plate 5 and produce vibration or noise, influence user's use and experience, in addition, this kind of structure still is convenient for design the position of corresponding inlet and liquid outlet according to the position of heat source part, is convenient for arrange the inside part position of laser projection equipment 100.

For example, the first flow-through structure 503, the second flow-through structure 504 and the third flow-through structure 505 can be implemented by providing three continuous S-shaped fluid passages that are not communicated with each other inside the plate body of the liquid cooling plate 5.

Referring to fig. 9, in some embodiments, laser projection device 100 further includes a plurality of heat sink fins 16. A plurality of heat dissipating fins 16 are disposed on a surface of the liquid-cooled plate 5 facing away from the light source 1 and the optical engine 2. In this way, the area of the outer surface of the liquid cooling plate 5 can be increased, so that the heat exchange area between the liquid cooling plate 5 and the air outside the laser projection device 100 is increased, and the cooling liquid can dissipate heat to the air outside the device more quickly.

In some embodiments, laser projection device 100 further comprises a radiation coating. The radiation coating is arranged on the surface of the liquid-cooled plate 5 facing away from the light source 1 and the light engine 2. The radiation coating (such as black paint, graphite and the like) is sprayed on the outer surface of the liquid cooling plate 5, so that the radiation heat dissipation coefficient of the surface of the liquid cooling plate 5 can be increased, and the heat dissipation efficiency of the whole equipment can be effectively improved.

Referring to fig. 2 and 7, in some embodiments, the housing 15 further includes a first sidewall and a second sidewall, both connected to the bottom case 1501, the first sidewall and the second sidewall are disposed opposite to each other, the first sidewall is opened with a first ventilation opening 15041, and the second sidewall is opened with a second ventilation opening (not shown). Illustratively, the first sidewall is the left sidewall 1504, and the second sidewall is the right sidewall. Laser projection device 100 also includes fan assembly 17. A fan assembly 17 is disposed within the housing 15, the fan assembly 17 being configured to drive an airflow from one of the first and second vents 15041 to the other.

So design, on the radiating basis of adoption liquid cooling, increase the fan and can carry out the forced air cooling heat dissipation to liquid cooling board 5 towards the surface of light source 1 and ray apparatus 2, guarantee liquid cooling board 5's heat transfer effect. In addition, under the condition that laser 101 sent monochromatic light or double-colored light, light source 1 still includes the fluorescence wheel (not shown in the figure), and the light that laser 101 was emergent goes out to throw and produces other color light on the fluorescence wheel, and the fluorescence wheel also can produce the heat at the in-process of work, conducts to the casing of light source 1 through the support on, through increasing fan assembly 17, can be under the effect of air current, carries out the forced air cooling heat dissipation to light source 1, guarantees the radiating effect of light source 1. In addition, the lens 8 also has a working temperature limit value, and the fan assembly 17 is added, so that air cooling and heat dissipation can be performed on the lens 8 under the action of air flow, and the normal work of the lens 8 can be guaranteed.

Referring to fig. 2 and 7, in some embodiments, the laser projection device 100 further comprises the aforementioned lens 8, and the lens 8 is closer to the second ventilation opening relative to the light source 1. The fan assembly 17 includes a first fan 1701. The first fan 1701 is disposed between the light source 1 and the first side wall, and the air outlet side of the first fan 1701 faces the first ventilation opening 10541. In this way, the first fan 1701 can drive airflow from the second ventilation opening to the first ventilation opening 10541 to cool all the components in the case 15 by air cooling.

For example, the first fan 1701 may be disposed near the light source 1 to secure an air-cooling heat dissipation effect to the light source 1.

Referring to fig. 2 and 7, in some embodiments, the fan assembly 17 further includes a second fan 1702. The second fan 1702 is disposed between the lens 8 and the second ventilation opening, and an air outlet side of the second fan 1702 faces the lens 8. In this way, the second fan 1702 can also drive the airflow from the second ventilation opening to the first ventilation opening 10541, so as to cool all the components in the housing 15.

For example, the second fan 1702 may be disposed near the lens 8 to ensure an air-cooling heat dissipation effect on the lens 8.

Referring to fig. 2 and 7, in some embodiments, the fan assembly 17 includes both the first fan 1701 and the second fan 1702. The arrangement positions of the two fans are the same as those described above, and are not described herein again.

In order to prevent the cooling liquid from flowing away, all the joints of the liquid inlet and the liquid outlet in the laser projection apparatus 100 may be connected by anti-dripping joints, which not only improves the installation efficiency, but also prevents the cooling liquid from flowing away to affect the heat dissipation effect.

Referring to fig. 10, in some embodiments, the first liquid cooling head 3, the second liquid cooling head 4, and the third liquid cooling head 10 may have a continuous S-shaped channel structure 301 on an inner wall, so as to increase a heat exchange area, which is beneficial to improving heat dissipation efficiency.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A laser projection device, comprising:

a light source comprising at least one laser;

an optical engine including a light valve;

the at least one first liquid cooling head is attached to the back surface of the at least one laser;

the second liquid cooling head is attached to the back surface of the light valve;

the liquid cooling plate is provided with a liquid inlet and a liquid outlet and is used for carrying out heat exchange;

the two ends of the first cooling pipeline are respectively communicated with the liquid inlet and the liquid outlet, and the at least one first liquid cooling head is communicated in the first cooling pipeline; and

and the two ends of the second cooling pipeline are respectively communicated with the liquid inlet and the liquid outlet, and the second liquid cooling head is communicated in the second cooling pipeline.

2. A laser projection device as claimed in claim 1,

the number of the first liquid cooling heads is multiple, and the multiple first liquid cooling heads are connected in series in the first cooling pipeline;

the number of the lasers is multiple;

one of the first liquid cooling heads is attached to the back surface of one of the lasers;

alternatively, the first and second electrodes may be,

in the plurality of lasers, at least two lasers with flush light-emitting surfaces form a group of laser groups, and one first liquid cooling head is attached to the back of one group of lasers.

3. The laser projection device of claim 1, further comprising:

a circuit board assembly including at least one circuit board;

at least one third liquid cooling head attached to the circuit board assembly; and

and the two ends of the third cooling pipeline are respectively communicated with the liquid inlet and the liquid outlet, and the at least one third liquid cooling head is communicated in the third cooling pipeline.

4. A laser projection device as claimed in claim 3,

the number of the third liquid cooling heads is multiple, and the multiple third liquid cooling heads are connected in series in the third cooling pipeline;

the number of the circuit boards is multiple;

one of the third liquid cooling heads is attached to one of the circuit boards;

alternatively, the first and second liquid crystal display panels may be,

among the circuit boards, at least two circuit boards which are stacked form a group of circuit board groups, and one third liquid cooling head is attached to one group of circuit board groups.

5. The laser projection device of claim 3, further comprising:

the first circulating pump is communicated with the first cooling pipeline;

the second circulating pump is communicated with the second cooling pipeline; and

and the third circulating pump is communicated with the third cooling pipeline.

6. The laser projection device of claim 5, further comprising:

the first temperature detection device is arranged on the light source and used for detecting the temperature of the at least one laser;

the second temperature detection device is arranged on the optical machine and used for detecting the temperature of the light valve;

the third temperature detection device is arranged on the circuit board assembly and used for detecting the temperature of at least one circuit board; and

the controller is electrically connected with the first temperature detection device, the second temperature detection device, the third temperature detection device, the first circulating pump, the second circulating pump and the third circulating pump; the controller is used for adjusting the flow rates of the first circulating pump, the second circulating pump and the third circulating pump according to the temperatures detected by the first temperature detection device, the second temperature detection device and the third temperature detection device.

7. A laser projection device as claimed in any one of claims 3 to 6,

the laser projection apparatus further includes: a housing including a bottom case; the light source, the optical machine, the circuit board assembly and the liquid cooling plate are all arranged in the shell; the liquid cooling plate is connected with the bottom shell and is arranged in a stacked mode, and the light source, the optical machine and the circuit board assembly are arranged on the liquid cooling plate.

8. A laser projection device as claimed in claim 7,

the liquid inlets of the liquid cooling plate comprise a first liquid inlet, a second liquid inlet and a third liquid inlet; the liquid outlets of the liquid cooling plate comprise a first liquid outlet, a second liquid outlet and a third liquid outlet; two ends of the first cooling pipeline are respectively communicated with the first liquid inlet and the first liquid outlet; two ends of the second cooling pipeline are respectively communicated with the second liquid inlet and the second liquid outlet; two ends of the third cooling pipeline are respectively communicated with the third liquid inlet and the third liquid outlet;

the liquid cooling plate includes:

the first flow-through structure is communicated with the first liquid inlet and the first liquid outlet;

the second flow-through structure is communicated with the second liquid inlet and the second liquid outlet; and

and the third flow-through structure is communicated with the third liquid inlet and the third liquid outlet.

9. A laser projection device as claimed in any one of claims 1 to 6, further comprising:

the plurality of radiating fins are arranged on the surface of the liquid cooling plate, which is away from the light source and the optical machine; and/or the presence of a gas in the atmosphere,

and the radiation coating is arranged on the surface of the liquid cooling plate, which is away from the light source and the optical machine.

10. A laser projection device as claimed in claim 7,

the shell further comprises a first side wall and a second side wall which are connected with the bottom shell, the first side wall and the second side wall are arranged oppositely, the first side wall is provided with a first ventilation opening, and the second side wall is provided with a second ventilation opening;

the laser projection apparatus further includes: and the fan assembly is arranged in the shell and used for driving the airflow to flow from one of the first ventilation opening and the second ventilation opening to the other.

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