WO2020244377A1

WO2020244377A1 - Laser projection device

Info

Publication number: WO2020244377A1
Application number: PCT/CN2020/090953
Authority: WO
Inventors: 崔雷; 邢哲
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2019-06-03
Filing date: 2020-05-19
Publication date: 2020-12-10
Also published as: CN112034667B; CN112034667A

Abstract

A laser projection device, which relates to the technical field of projection devices, and which is used to solve the problem in which the heat dissipation effect of a laser in a laser projection device being poor affects the light-emitting efficiency of a light source system. The laser projection device comprises a laser light source (100). A back surface of the laser light source (100) is provided with a cooling head (200) and a pump (500), the cooling head (200) being connected to a cooling row (300). An outlet of the cooling row (300) is in communication with an inlet of the cooling head (200), and an inlet of the cooling row (300) is in communication with an outlet of the cooling head (200). The pump (500) is used to drive a coolant to circulate in the cooling head (200) and the cooling row (300). The cooling row (300) is connected to a liquid replenishment device (800), and the liquid replenishment device (800) is used to replenish the coolant in the cooling row (300). A fan (400) is mounted at a side of the cooling row (300), and the laser light source (100), the cooling head (200), the pump (500) and the liquid replenishment device (800) are located at the other side of the cooling row (300). The described laser projection device is used to display images by using a laser as a light source.

Description

Laser projection equipment

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on June 3, 2019, the application number is 201910478114.X, and the application name is "a laser projection device", the entire content of which is incorporated into this application by reference .

Technical field

This application relates to the technical field of projection equipment, and in particular to a laser projection equipment.

Background technique

Laser projection display technology is an optical display technology that uses optical system, circuit system, and lens system to project laser onto the screen to achieve laser image projection; among them, semiconductor laser is a key component of laser projection display technology, which can convert electrical energy into Light energy. The electro-optical conversion efficiency of the existing semiconductor laser is about 40%, and 60% of the electrical energy is converted into heat; especially for laser TVs, in order to obtain higher luminous flux or higher color gamut, usually multiple lasers are combined to form a laser In the light source system of the TV, multiple lasers will generate a lot of heat, causing the temperature of the laser to rise, and related technologies cannot dissipate the heat of the laser in time, causing the luminous efficiency of the laser to gradually decrease.

Application content

The present application provides a laser projection device, including a laser light source, a cold head and a pump are provided on the back of the laser light source, the cold head is connected with a cold row, and the outlet of the cold row is communicated with the inlet of the cold head, The inlet of the cold row is in communication with the outlet of the cold head, the pump is used to drive the cooling liquid to circulate in the cold head and the cold row, and the cold row is connected with a fluid replacement device. To replenish the cooling liquid to the cold row, a fan is installed on one side of the cold row, and the laser light source, the cold head, the pump and the liquid supplement are located on the other side of the cold row.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings that need to be used in the description of the embodiments or related technologies. Obviously, the drawings in the following description are merely present For some of the embodiments of the application, for those of ordinary skill in the art, other drawings can be obtained from these drawings without creative work.

FIG. 1 is a schematic structural diagram of a laser projection device according to an embodiment of the application;

FIG. 2 is a schematic diagram of the structure of the laser projection device in Embodiment 1;

3 is a schematic diagram of the structure of the laser projection equipment in Embodiment 1 without a laser light source;

4 is a schematic diagram of the structure of the cold row in the laser projection equipment of Embodiment 1;

FIG. 5 is a schematic diagram of the structure of the first cold head in the laser projection equipment of Embodiment 1;

6 is a schematic diagram of the structure of the bottom plate of the housing of the first cold head in the laser projection device of Embodiment 1;

FIG. 7 is one of the structural schematic diagrams of the laser projection equipment of Embodiment 2;

8 is a schematic structural diagram of a liquid-cooled heat dissipation system in a laser projection device according to Embodiment 2;

Fig. 9 is the second structural diagram of the laser projection equipment of the second embodiment;

Fig. 10 is the third structural diagram of the laser projection equipment of the second embodiment;

11 is a schematic diagram of the structure of the mounting frame in the laser light source of the laser projection equipment in Embodiment 2;

12 is a schematic diagram of the structure of the heat conduction device in the laser projection equipment of Embodiment 2;

FIG. 13 is a schematic diagram of the structure of the second cold head in the laser projection equipment of Embodiment 3;

Figure 14 is one of the exploded views of the second cold head in the laser projection device of the third embodiment;

Figure 15 is the second exploded view of the second cold head in the laser projection device of the third embodiment;

Figure 16 is one of the cross-sectional views of the second cold head in the laser projection device of the third embodiment;

17 is the second cross-sectional view of the second cold head in the laser projection equipment of the third embodiment;

18 is a schematic diagram of the structure of the first air guide of the second cold head in the laser projection equipment of Embodiment 3;

19 is a schematic diagram of the structure of the second air guide of the second cold head in the laser projection equipment of Embodiment 3;

20 is a schematic diagram of the structure of the top plate of the second cold head in the laser projection equipment of Embodiment 3;

21 is a schematic diagram of the structure of the heat conducting device, cold head, and pump in the laser projection equipment of Embodiment 5.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

In the description of this application, it should be noted that the terms "installation", "connection", and "connection" should be interpreted broadly unless otherwise clearly specified and limited. For example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be mechanically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood under specific circumstances.

In the description of this application, "and/or" is only an association relationship describing associated objects, which means that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, and both A and A B, there are three cases of B alone. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

1, the laser projection device of the embodiment of the present application includes a laser light source 100. The back of the laser light source 100 is provided with a cold head 200 and a pump 500. The cold head 200 is connected to a cold exhaust 300, and the outlet of the cold exhaust 300 and the cold head 200 The inlet of the cold row 300 is connected with the outlet of the cold head 200. The pump 500 is used to drive the coolant to circulate in the cold head 200 and the cold row 300. The cold row 300 is connected with a liquid supplement 800 which is used for To replenish the cold row with coolant, a fan 400 is installed on one side of the cold row 300, and the laser light source 100, the cold head 200, the pump 500, and the liquid supplement 800 are located on the other side of the cold row 300.

In the laser projection device provided by the embodiment of the present application, a cold head 200 and a pump 500 are arranged on the back of the laser light source 100. The cold head 200 is connected to the cold exhaust 300, and the inlet of the cold exhaust 300 is connected to the outlet of the cold exhaust 300. The outlet of the is connected with the inlet of the cold head 200, the pump 500 drives the cooling liquid to circulate in the cold head 200 and the cold row 300, the cold row 300 is connected with a liquid supplement 800, and the liquid supplement 800 is used to supplement the cold row 300 with coolant; When the laser projection equipment is running, the coolant in the cold head 200 absorbs the heat generated by the laser light source 100 and then the temperature rises. Under the action of the pump 500, the higher temperature coolant flows out of the outlet of the cold head 200 and passes through the cold exhaust 300. The inlet of the cold row 300 enters the cold row 300, and the coolant can exchange heat with the air near the cold row 300 during the process of flowing in the cold row 300 to achieve cooling, and the fan 400 on the cold row 300 can accelerate the air flow near the cold row 300 , So that the cooling liquid can exchange heat with more air, the temperature of the cooling liquid is rapidly reduced, and finally the cooling liquid with a lower temperature is returned to the cold head 200 through the outlet of the cold row 300 and the inlet of the cold head 200. Therefore, the heat generated by the laser light source 100 in the embodiment of the present application can be quickly dissipated by the liquid cooling system including the cold head 200, the cold exhaust 300 and the pump 500, ensuring that the working temperature of the laser light source 100 is within the design value range, and improving the laser The reliability of the light source is conducive to the stability of the luminous performance of the laser light source; and the fan 400 is installed on one side of the cold row 300, and the laser light source 100, the cold head 200, the pump 500 and the fluid replacement device 800 are located on the other side of the cold row 300. This makes the entire laser device compact and small.

The above-mentioned laser light source 100 includes one or more laser groups, the number of cold heads 200 is one or more, and each laser group is corresponding to at least one cold head 200, so as to ensure that heat can be dissipated for each laser group. Wherein, the above-mentioned laser group includes one or more lasers.

Depending on the number, power, location and capacity of the nearby space of the lasers in the laser light source 100, the structure and composition of the applied liquid cooling system are different. The application will be further described below in conjunction with several specific embodiments.

Example 1

2 to 3, the laser projection device of this embodiment includes a laser light source 100. The laser light source 100 includes a first laser group and a second laser group. The first laser group includes a first laser and a heat sink for the first laser. There is a first cold head 201 corresponding to the upper part (such as being attached to each other); the second laser group includes a second laser, and a second cold head 202 is correspondingly provided on the heat sink of the second laser. The first cold head 201 and the second cold head The heads 202 are connected in series, the inlet of the first cold head 201 is connected with the outlet of the cold row 300, the outlet of the second cold head 202 is connected with the inlet of the cold row 300, and a fan 400 is installed on the cold row 300.

In this embodiment, the first laser and the second laser are both equipped with cold heads. The two cold heads guide the heat absorbed from the two lasers to the cold row 300 through the coolant, and the high-temperature coolant dissipates heat in the cold row 300 After the temperature is lowered, the heat dissipation is accelerated by the fan 400, so that the laser light source 100 in the laser projection device of this embodiment has a better heat dissipation effect, improves the reliability of the laser light source, and facilitates the stability of the light-emitting performance of the laser light source.

Further, referring to FIG. 4, the cold row 300 includes a plurality of heat dissipation tubes 311 arranged in parallel, and heat dissipation fins are arranged between adjacent heat dissipation tubes 311. The fan 400 is installed on one radial side of the plurality of heat dissipation tubes 311. The laser, the second laser, the first cold head 201, and the second cold head 202 are all located on the other radial side of the plurality of heat dissipation pipes 311, so that the area of the cold exhaust 300 covered by the wind field of the fan 400 is larger, and the heat dissipation effect is better. it is good.

In this embodiment, the first cold head 201 and the second cold head 202 both adopt the same structure. Taking the first cold head 201 as an example, the first cold head 201 includes a housing 1 that can contain a cooling liquid. The inner wall of the bottom plate 10b of 1 is provided with a plurality of spoiler posts 3, which are arranged at intervals, as shown in Figs. 5-6. The spoiler 3 can hinder the cooling liquid from flowing on the bottom plate 10b, reduce the flow speed of the cooling liquid, and increase the heat dissipation area of the cooling liquid, thereby further improving the heat dissipation effect of the first cold head 201.

If the ratio of the diameter to the height of the spoiler column 3 is greater than 0.75, the resistance to the coolant is greater, and the length between the spoiler column 3 and the coolant is shorter, so the diameter and height of the spoiler column 3 in this embodiment The ratio of is less than 0.75, for example, the ratio of the diameter to the height of the spoiler 33 is 0.7, 0.65, 0.6. In addition, the bottom plate 10b of the housing 1 of the first cold head 201 is also provided with a plurality of mutually parallel strip bonding blocks 4 or flat bonding blocks 5 bonded to the heat sink of the first laser.

Example 2

7-12, the laser projection device of this embodiment includes a laser light source 100. The laser light source 100 includes a first laser group and a second laser group. The first laser group includes a first laser and a second laser. In the second laser setting, the second laser group includes a third laser; the laser projection equipment of this embodiment also includes a first heat conduction device 600 and a first pump 501. The first heat conduction device 600 includes a first heat conduction block 601 and a second heat conduction block 601. Block 602 and the first heat transfer tube 603 sealed with refrigerant inside. The position of the first heat transfer block 601 is higher than that of the second heat transfer block 602. The first heat transfer block 601 and the second heat transfer block 602 are respectively sleeved in the first Outside the two ends of the heat transfer tube 603, as shown in Figures 7 to 8 and Figure 12; the first heat conduction block 601 is arranged corresponding to the heat sink of the first laser (such as bonding), and the second heat conduction block 602 is connected to the heat sink of the second laser. The heat sink is arranged correspondingly, the first heat conducting block 601 is provided with a first cold head 201 on the side away from the first laser, and the second cold head 202 is correspondingly provided on the heat sink of the third laser. The heads 202 are connected in series, the inlet of the first cold head 201 is connected with the outlet of the first cold row 301, the outlet of the second cold head 202 is connected with the inlet of the first cold row 301, and a first fan 401 is installed on the first cold row 301 , The first pump 501 drives the coolant to circulate in the first cold row 301, the first cold head 201 and the second cold head 202, that is, the first cold head 201, the second cold head 202, the first pump 501, and the second cold head 202 A cold row 301 and a first fan 401 constitute a first liquid cooling heat dissipation system.

The bottom surface of the shell 1 of the first cold head 201 is attached to the first heat transfer block 601, the heat sink of the second laser can transfer heat to the second heat transfer block 602, and the second heat transfer block 602 transfers heat to the first heat transfer tube 603, the coolant in the first heat transfer tube 603 is heated and evaporated into gas, the gas refrigerant floats to the end of the heat transfer tube located in the first heat conduction block 601, and the heat sink of the first laser transfers the heat to the first heat transfer block 601 and the first heat transfer tube 603, the temperature of the first heat transfer block 601 and the first heat transfer tube 603 is reduced by the coolant in the housing 1 of the first cold head 201, and the gaseous refrigerant in the first heat transfer tube 603 After being condensed, it drops to the end of the first heat transfer tube 603 located in the second heat conducting block 602, and the refrigerant in the first heat transfer tube 603 repeatedly evaporates and condenses to realize the heat conduction to the first laser and the second laser; The bottom surface of the housing 1 of the second cold head 202 is attached to the heat sink of the third laser, and the third laser is cooled by the low-temperature coolant in the second cold head 202. The liquid-cooled heat dissipation system in the laser projection equipment of this embodiment guides the two lasers in the first laser group to one place through the first heat conduction device, which reduces the number of cold heads and reduces the cost.

Of course, the heat-conducting blocks in the first heat-conducting device 600 are not limited to two. If the first laser group also includes a third laser, a fourth laser, ..., an Nth laser, a third laser, a fourth laser, ... The N lasers are all set lower than the first laser. The number of heat conduction blocks in the first heat conduction device 600 is the same as the number of lasers in the first laser group. One heat transfer tube can be used to connect all the heat conduction blocks. Of course, one heat transfer block is used. The heat conduction device structure with multiple heat conduction blocks connected in series is suitable for the first laser group with lower energy consumption.

Optionally, according to the positional relationship between the first laser and the second laser, if the angle between the plane of the first laser and the plane of the second laser is an acute angle, the plane of the corresponding first heat conducting block 601 may be the same as the plane of the second laser. The angle between the plane of the heat conducting block 602 is less than 90°; if the plane of the first laser is perpendicular to the plane of the second laser, the plane of the first heat conducting block 601 and the plane of the second heat conducting block 602 are perpendicular to each other, such as The heat transfer tube 6 embedded in the first heat conducting block 601 and the second heat conducting block 602 is approximately L-shaped, and the heat transfer tube 603 in FIG. 8 is L-shaped with rounded corners.

In the case where there are multiple lasers with different heights in the laser light source 100, and the energy consumption of the lasers is high, the heat dissipation effect of using a heat conduction device is poor. For example, the laser light source 100 of this embodiment further includes a third laser group, the third laser group includes a fourth laser and a fifth laser, and the fourth laser is set higher than the fifth laser; the laser projection device of this embodiment further includes a second laser. The heat conduction device 700 has the same structure as the first heat conduction device 600. The second heat conduction device 700 includes a third heat conduction block 701, a fourth heat conduction block 702, and a second heat transfer tube sealed with a refrigerant inside 703, the position of the third heat conduction block 701 is higher than the position of the fourth heat conduction block 702, the third heat conduction block 701 and the fourth heat conduction block 702 are respectively sleeved outside the two ends of the second heat transfer tube 703, and the third heat conduction block 701 It is attached to the heat sink of the fourth laser, the fourth heat conduction block 702 is attached to the heat sink of the fifth laser, and the third cold head 203 is provided on the side of the third heat transfer block away from the fourth laser. The laser projection device of this embodiment The use of three cold heads to dissipate heat to the five lasers respectively not only ensures the heat dissipation effect of the laser light source 100, but also uses a small number of cold heads and lower cost.

11, the laser light source 10 includes a first mounting frame 101, a second mounting frame 102, a third mounting frame 103, a fourth mounting frame 104, and a fifth mounting frame 105. The first laser is mounted on the first mounting frame 101, The second laser is mounted on the second mounting frame 102, the third laser is mounted on the third mounting frame 103, the fourth laser is mounted on the fourth mounting frame 104, and the fifth laser is mounted on the fifth mounting frame 105.

Optionally, the first cold head 201, the second cold head 202, and the third cold head 203 can be connected in series, the inlet of the first cold head 201 is connected to the outlet of the first cold row 301, and the outlet of the third cold head 203 is connected to The inlet of the first cold row 301 is connected. This solution is suitable for the case where the heat generation of the five lasers in the laser light source 100 is low.

Optionally, the laser projection device of this embodiment further includes a second cold row 302, a second fan 402, and a second pump 502. The first cold head 201 and the second cold head 202 are connected in series, and the inlet of the first cold head 201 is connected to The outlet of the first cold row 301 is in communication, the outlet of the second cold head 202 is in communication with the inlet of the first cold row 301; the inlet of the third cold head 203 is in communication with the outlet of the second cold row 302, and the outlet of the third cold head 203 Connected with the inlet of the second cold row 302, the second fan 402 is installed on the second cold row 302, and the second pump 502 drives the coolant to circulate in the second cold row 302 and the third cold head 203, that is, the third cold row The cold head 203, the second cold row 302, the second pump 502 and the second fan 402 constitute a second liquid cooling heat dissipation system. The first liquid cooling heat dissipation system and the second liquid cooling heat dissipation system have a good heat dissipation effect on the laser projection equipment. It is suitable for situations where the laser light source 100 generates a large amount of heat. The first fan 401 in FIGS. 7-10 includes two fans, which are arranged in sequence along the axial direction of the heat dissipation pipe, and the second fan 402 includes one fan.

In order to replenish the cooling liquid of the liquid-cooled heat dissipation system in time, the laser projection device of this embodiment further includes a liquid supplement 800, which is respectively connected with the first liquid-cooled heat dissipation system and the second liquid-cooled heat dissipation system.

It should be noted that the structures of the first cold head 201, the second cold head 202, and the third cold head 203 in this embodiment are the same as those of the first cold head 201 and the second cold head 202 in the first embodiment.

Example 3

The laser projection device of this embodiment has a structure similar to that of Embodiment 1, except that the structure of the second cold head 202 in this embodiment is different from that of the second cold head 202 in Embodiment 1. 13 to 20, the second cold head 202 in this embodiment includes a housing 1 that can contain cooling liquid and a diversion structure 2 installed in the housing 1. The bottom plate 10b of the housing 1 is used to The two lasers exchange heat. The housing 1 is provided with an inlet 11 of the second cold head 202 and an outlet 12 of the second cold head 202. The inlet 11 of the second cold head 202 is higher than the outlet 12 of the second cold head 202. The flow guiding structure 2 is used to increase the length of the flow path of the cooling liquid from the inlet 11 of the second cold head 202 to the bottom plate 10b of the housing 1.

In the laser projection device provided by this embodiment, since the diversion structure 2 is installed in the housing 1 of the second cold head 202, the cooling liquid derived from the outlet of the first cold head 201 can enter through the inlet 11 of the second cold head 202 In the housing 1 of the second cold head 202, the diversion structure 2 can increase the length of the flow path of the cooling liquid from the inlet 11 to the bottom plate 10b of the housing 1 in the second cold head 202, so that the cooling liquid will fall into the housing 1 There is a long flow time in front of the bottom plate 10b. When the temperature of the cooling liquid flowing from the first cold head 201 is high, the cooling liquid flows through the guide structure 2 in the second cold head 202 to dissipate heat, such as cooling liquid The heat is transferred to the housing 1 and dissipated through the housing 1 through contact with the diversion structure 2, thereby reducing the temperature of the cooling liquid, so that the temperature of the cooling liquid falling on the bottom plate 10b of the housing 1 is relatively low, which can be fully compatible with the first The second laser exchanges heat and has a better cooling effect on the second laser. The second cold head 202 in this embodiment is used as a cooling module for the second laser, and has a better heat dissipation effect on the second laser, reducing the problem of poor heat dissipation of the laser that affects the luminous efficiency of the laser light source 100 in the laser projection device.

It should be noted that the structure of the second cold head 202 described above is suitable for use in a laser light source 100 including multiple lasers. The structure of the Nth (N≥2) cold head of the multiple cold heads connected in series in the liquid cooling system The structure of the second cold head 202 is the same, and the heat dissipation effect of the laser light source 100 is better.

The above-mentioned guide structure 2 includes a first guide plate 21, which is located between the inlet 11 of the second cold head 202 and the outlet 12 of the second cold head 202, and the upper part of the first guide plate 21 The surface is inclined. There is a gap between the first edge 211 of the first baffle 21 and the first side wall 1a of the housing 1 of the second cold head 202 away from the inlet 11 of the second cold head 202. The first baffle 21 The other edges of the second cold head 202 are in sealed connection with the other side walls of the housing 1 of the second cold head 202, so that the coolant flowing in from the inlet 11 of the second cold head 202 flows through the first baffle 21. The temperature gradually decreases, and finally falls from the first edge 211 to the bottom plate 10b of the casing 1, and the structure of the diversion structure 2 is simple. It should be noted that the outlet 12 of the second cold head 202 is arranged on the second side wall 1b of the housing 1, and the second side wall 1b is arranged opposite to the first side wall 1a.

Further, the deflector structure 2 of the second cold head 202 in this embodiment not only includes the first deflector 21 described above, but also includes a second deflector 22, which is located on the first deflector 21. Between the second cold head 202 and the outlet 12 of the second cold head 202, the upper surface of the second baffle 22 is inclined, and the second edge 221 of the second baffle 22 has a gap with the second side wall 1b of the housing 1. The other edges of the second baffle 22 are in hermetically connected with the other side walls of the housing 1, that is, the cooling liquid flows along the first baffle 21 and drops along the first edge 211 of the first baffle 21 to the second baffle On the upper surface of the plate 22, the cooling liquid can further dissipate heat while flowing on the second baffle 22, further improving the heat dissipation effect of the second laser. Optionally, the outlet 12 of the second cold head 202 can be arranged on the first side wall 1a or on the second side wall 1b. The outlet 12 of the second cold head 202 is arranged on the second side wall 1b, and the position where the coolant drops to the bottom plate 10b is far from the outlet 12 of the second cold head 202. After the coolant can fully exchange heat with the second laser, Then it flows out from the outlet 12 of the second cold head 202.

It should be noted that the flow guiding structure 2 is not limited to the above-mentioned structure, but can also include a plurality of flow guiding components composed of the above-mentioned first baffle 21 and second baffle 22, so as to further improve the cooling of the inlet into the housing 1. The heat dissipation effect of liquid.

In order to further improve the cooling effect of the cooling liquid falling to the bottom plate 10b of the housing 1, the inner wall of the housing 1 of the second cold head 202 of this embodiment is provided with a plurality of spoiler posts 3, and the plurality of spoiler posts 3 are arranged at intervals. The two spoiler posts 3 may all be located on the top surface of the housing 1, or the multiple spoiler posts 3 are all located on the bottom surface of the housing 1, or some of the multiple spoiler posts 3 are located on the top surface of the housing 1. , The other of the plurality of spoiler columns 3 are located on the bottom surface of the housing 1. The spoiler columns 3 can hinder the flow of the cooling liquid along the first baffle 21 or the bottom plate 10b, reduce the flow speed of the cooling liquid, and increase the cooling The heat dissipation area of the liquid, thereby further improving the heat dissipation effect of the second laser.

Since the surface of the first baffle 21 is inclined, the distance between the lower ends of the plurality of baffle posts 3 on the top surface of the housing 1 and the upper surface of the first baffle 21 is equal, so that the baffle posts 3 are opposite to each other. The cooling liquid has a better turbulence effect, which can increase the heat dissipation effect of the turbulence column 3 on the cooling liquid.

Optionally, the inclination of the first baffle 21 and the second baffle 22 may be the same or different. Taking the first deflector 21 as an example, if the inclination angle α of the upper surface of the first deflector 21 is greater than 20°, the flow velocity of the cooling liquid on the first deflector 21 is too fast, and the cooling liquid flows to the casing. 1 The flow time before the bottom plate 10b is too short, and the heat dissipation effect is not good; if the inclination angle α of the upper surface of the first baffle 21 is less than 10°, the flow rate of the cooling liquid on the first baffle 21 is too slow and cannot be timely Supplementing the amount of cooling liquid on the bottom plate 10b of the housing 1 results in poor heat exchange between the bottom plate 10b of the housing 1 and the second laser. Therefore, the inclination angle α of the upper surface of the first deflector 21 in the second cold head 202 of this embodiment is 10°-20°, such as α being 10°, 14°, 18°, 20°, and the second guiding plate The inclination angle of the upper surface of the baffle 22 is the same as the inclination angle of the upper surface of the first baffle 21.

It should be noted that the housing 1, the flow guiding structure 2, and the spoiler 3 of the above-mentioned second cold head 202 can be manufactured in one piece, or can be manufactured in layers. 13-15, the housing 1 of the second cold head 202 includes a top plate 10a, a bottom plate 10b, a first flow guide 10c, and a second flow guide 10d. The first flow guide 10c and the second flow guide 10d are both It is located between the top plate 10a and the bottom plate 10b, and the first air guide 10c is located above the second air guide 10d. Wherein, the lower surface of the top plate 10a is provided with a plurality of spoiler posts 3, and the plurality of spoiler posts 3 are evenly distributed; the upper surface of the bottom plate 10b is provided with a plurality of spoiler posts 3, and the plurality of spoiler posts 3 are evenly distributed; The first deflector 10c includes a ring-shaped first fixing frame. The side wall of the first fixing frame is provided with an inlet 11 of the second cold head 202. The first deflector 21 is installed on the first fixing frame, and the second The inlet 11 of the cold head 202 is located above the first deflector 21; the second deflector 10d includes an annular second fixing frame, and an outlet 12 of the second cold head 202 is opened on the side wall of the second fixing frame. The second baffle 22 is installed on the second fixing frame, the outlet 12 of the second cold head 202 is located below the second baffle 22, and the inlet 11 of the second cold head 202 is opposite to the outlet 12 of the second cold head 202. Setting; the top plate 10a, the first air guide 10c, the second air guide 10d and the bottom plate 10b are welded in sequence. In addition, the bottom plate 10b of the housing 1 is also provided with a plurality of mutually parallel strip-shaped bonding blocks 4 or flat-plate bonding blocks 5 bonded to the heat sink of the second laser. Of course, the first cold head 201 in this embodiment can also adopt the same structure as the second cold head 202.

In order to illustrate the technical effect of this embodiment, two sets of comparison schemes are set up: In the first scheme, the laser light source 100 in the laser projection device only includes one laser, and the laser is cooled by the cold head including the aforementioned flow guiding structure and spoiler. ; The laser light source 100 in the laser projection device in the second solution also includes only one laser, and the laser is cooled by a cold head that is not equipped with a flow guiding structure and a spoiler; the first solution and the second solution are used through software ANSYS Icepak The schemes are respectively modeled and simulated. Among them, the simulation models of the first scheme and the second scheme adopt the following conditions: the shell of the cold head is made of aluminum alloy, and the cooling liquid in the shell of the cold head is pure water. The flow rate is 10L/min, the inlet water temperature is 25℃, and the initial conditions for setting the simulation are: the thermal power of the laser is set to 100W, the ambient temperature is 25℃, and the number of grids is about 900,000. Perform the two simulation models separately Solve the settings and calculate the temperature, the results are shown in Table 1:

Table 1 The speed of the fan and the temperature comparison table of the lasers in the two solutions

According to the simulation calculation results in Table 1, it can be seen that: (1) As the fan wind speed increases, the temperature of the laser gradually decreases under the action of the cold head. (2) Under the same air volume conditions, the cold head of the first scheme has a better heat dissipation effect on the laser than the cold head of the second scheme.

In order to illustrate that in the solution of the first cold head and the second cold head in series in the liquid cooling system, the second cold head with the flow guide structure and the spoiler column has a better heat dissipation effect on the second laser, two further comparison schemes are set up : In the third solution, the laser light source 100 of the laser projection device includes a first laser and a second laser. The first cold head that does not include the flow guide structure and the spoiler is used to cool the first laser, and the first laser is cooled by the flow guide structure and The second cold head of the spoiler cools the second laser, the inlet of the first cold head is connected with the inlet of the first cold row, and the outlet of the second cold head is connected with the inlet of the first cold row; in the fourth solution The laser projection equipment is similar to the laser projection equipment in the third scheme, the difference is that: the first cold head and the second cold head do not include the diversion structure and the spoiler column; the third and fourth schemes are respectively adjusted through the software ANSYS Icepak Perform modeling and simulation calculations. The thermal power of the first laser and the second laser are both 180W, and other conditions are the same as the simulation parameters of the first scheme. The two simulation models are respectively solved and set, and the temperature calculation is performed. As shown in Table 2:

Table 2 The temperature comparison table of the two lasers in different ambient temperatures and the two solutions

According to Table 2, the second cold head in the third solution can significantly reduce the temperature difference between the first laser and the second laser, equalize the working temperature of the laser light source, and the second cold head has a good heat dissipation effect on the second laser.

Example 4

The laser projection device in this embodiment has a structure similar to that of embodiment 2, except that: the first pump 501 includes a casing, and the casing is provided with an impeller cavity. The casing of the first pump 501 is sealed with the casing 1 of the second cold head 202. Connected, and the impeller cavity of the first pump 501 is communicated with the inner cavity of the housing of the second cold head 202, so that the structure of the liquid cooling system is relatively compact. This solution is suitable for laser projection equipment with a smaller volume. Of course, the first cold head 201 and the first pump 501 can also be combined in the above manner, and the third cold head 203 and the second pump 502 may be combined in the above manner.

Example 5

The structure of this embodiment is similar to the structure of embodiment 2, the difference is that: the first pump 501 and the second pump 502 have the same structure, taking the first pump 501 as an example, referring to FIG. 21, the first pump 501 includes a housing and In the impeller cavity in the casing, the first cold head 201 is a heat transfer fin, and the heat transfer fin is part of the wall of the impeller cavity, and the outer wall of the heat transfer fin is attached to the first heat conduction block 601, and the coolant enters the impeller cavity and passes through The heat fin exchanges heat with the first heat transfer block 601, thereby reducing the temperature of the gaseous refrigerant in the higher end of the first heat transfer block 601 and the first heat transfer tube 603.

Further, the bonding surface of the heat transfer sheet and the first heat transfer block 601 is provided with a heat conduction layer in this embodiment, or the bonding surface of the first heat transfer block 601 and the heat transfer sheet is provided with a heat conduction layer, and the heat transfer layer is used for The contact thermal resistance between the first pump 501 and the first heat conducting block 601 is reduced, thereby improving the heat exchange efficiency of the first heat conducting block 601. The above thermal conductive layer is thermal conductive silicone grease, the thermal conductivity of the thermal conductive silicone grease is greater than 5 (w/m·k), and the thermal conductivity is good.

In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, All should be covered in the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A laser projection equipment, characterized in that it comprises a laser light source, a cold head and a pump are arranged on the back of the laser light source, the cold head is connected with a cold row, and the outlet of the cold row is communicated with the inlet of the cold head , The inlet of the cold row is in communication with the outlet of the cold head, the pump is used to drive the cooling liquid to circulate in the cold head and the cold row, the cold row is connected with a liquid supplement, and the liquid supplement The device is used to replenish the cooling liquid for the cold row, a fan is installed on one side of the cold row, and the laser light source, the cold head, the pump and the liquid replacement device are located on the other side of the cold row.
The laser projection device according to claim 1, wherein the cold head includes a shell capable of containing cooling liquid and a diversion structure installed in the shell, and the bottom plate of the shell is used for The lasers in the laser group exchange heat, and the housing is provided with an inlet of the cold head and an outlet of the cold head, the inlet of the cold head is higher than the outlet of the cold head, and the guide The flow structure is used to increase the length of the flow path of the cooling liquid from the inlet of the cold head to the bottom plate of the shell.
The laser projection device according to claim 2, wherein the guide structure comprises a first guide plate located between the inlet of the cold head and the outlet of the cold head, and the first guide The upper surface of the plate is an inclined surface, and the first edge of the first deflector has a gap with the first side wall of the housing far from the inlet of the cold head. The other edges of the first deflector It is connected with other side walls of the shell in a sealing manner.
The laser projection device according to claim 3, wherein the flow guide structure comprises a second guide plate located between the first guide plate and the outlet of the cold head, and the second guide plate The upper surface of the baffle is inclined, and the second edge of the second baffle has a gap with the second side wall of the housing, and the other edges of the second baffle are connected to other edges of the housing. The side walls are sealed and connected, and the second side wall is arranged opposite to the first side wall.
The laser projection device according to claim 2, wherein the inner wall of the housing is provided with a plurality of spoiler columns, the plurality of spoiler columns are arranged at intervals, and the plurality of spoiler columns are located in the The top and/or bottom surface of the housing.
The laser projection device according to claim 5, wherein the ratio of the diameter to the height of the spoiler column is less than 0.75.
The laser projection device according to claim 3, wherein the inclination angle of the upper surface of the first deflector is 10°-20°.
The laser projection device according to any one of claims 2-7, wherein the pump comprises a housing, and an impeller cavity provided in the housing, and the housing of the pump and the housing of the cold head Body connection, the impeller cavity of the pump communicates with the inner cavity of the housing of the cold head.
The laser projection device according to any one of claims 1 to 7, further comprising a first heat conducting block, a second heat conducting block, and a heat transfer tube sealed with a refrigerant inside, the first heat conducting block And the second heat conducting block are respectively sleeved outside the two ends of the heat transfer tube, the laser light source includes a first laser and a second laser, the second laser is set lower than the first laser, and The first heat conducting block is arranged opposite to the heat sink of the first laser, the second heat conducting block is arranged opposite to the heat sink of the second laser, and the cold head is located at the first heat conducting block away from the first heat sink. One side of the laser.
9. The laser projection device according to claim 9, wherein the second laser and the first laser are perpendicular to each other.