Projection device

Abstract

The invention discloses projection equipment which comprises a shell, a fan, a water cooling system and a light machine, an air inlet and an air outlet are formed in the two adjacent wall faces of the shell respectively, a heat dissipation channel is formed between the air inlet and the air outlet in the shell, and the light machine, the water cooling system and the fan are located in the heat dissipation channel; the water cooling system comprises a heat conduction plate and a radiator which are communicated, the heat conduction plate is connected with the light machine, the air inlet side of the radiator is right opposite to the light machine, and the air outlet side of the radiator is right opposite to the air outlet. According to the projection equipment, the heat dissipation effect can be effectively improved, and it is ensured that the image quality can be kept stable.

Description

Technical Field

[0001] The present invention relates to the technical field of projection equipment, and in particular to a projection equipment. Background Art

[0002] Projectors are increasingly popular in the consumer market due to their portability, high image quality, and compact size. To ensure stable image quality over extended periods of use, projectors often place high demands on their heat dissipation capabilities. Excessively high temperatures in optical components (such as light sources and light valves) can easily degrade component performance, impacting the final projected image quality.

[0003] The air inlet of the existing common projector cooling duct is located at the front end of the shell, and the air outlet is located at the rear end. The airflow will be blocked by components such as the optical engine, sound cavity, and internal bracket during the process of reaching the air outlet from the front end of the air inlet, resulting in insufficient air flow and affecting the heat dissipation effect. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a projection device that can effectively improve the heat dissipation effect and ensure that the picture quality can remain stable.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a projection device, including a shell, a fan, a water cooling system and an optical engine. An air inlet and an air outlet are respectively formed on two adjacent wall surfaces of the shell. A heat dissipation channel is formed in the shell between the air inlet and the air outlet. The optical engine, the water cooling system and the fan are located in the heat dissipation channel. The water cooling system includes a connected heat conduction plate and a cold radiator. The heat conduction plate is connected to the optical engine. The air inlet side of the cold radiator faces the optical engine, and the air outlet side faces the air outlet.

[0007] Preferably, the projection device further comprises a bracket, the bracket comprising a top plate and side plates connected to each other, the top plate and the side plates surrounding each other to form an installation cavity, the optical engine is fixed on the top plate and / or the side plates and is located in the installation cavity; the fan is located below the optical engine, and the optical engine and the fan are spaced apart to form an air duct.

[0008] Preferably, the projection device also includes a plurality of fasteners, a plurality of support columns are provided on the bracket, the support columns are protruded from the bottom of the top plate and / or the inner wall surface of the side plate, the support columns extend toward the direction of the fan, and the optical machine is fixedly connected to the plurality of support columns by the plurality of fasteners.

[0009] Preferably, the projection device further includes a rigid support member, which is located at the bottom of the housing and fixed to the bottom end of the side panel, and the rigid support member and the bracket are enclosed to form a accommodating cavity, the radiator is fixed on the rigid support member and is located in the accommodating cavity, and the accommodating cavity forms a channel entrance of the air duct at one end close to the air inlet, and the channel entrance is opposite to the air inlet.

[0010] Preferably, the rigid support member forms a baffle on one side of the wall forming the air inlet on the outer shell, the fan is located between the radiator and the optical engine, and the baffle extends upward from the bottom of the accommodating cavity to the position of the fan. The baffle and the top plate and the side plates interconnected on the bracket together surround the channel entrance of the air duct.

[0011] Preferably, slide grooves are provided on the outer sides of the two opposite side walls of the bracket, and slide rails are provided on the inner sides of the two opposite side walls of the shell, and the slide rails are inserted into the slide grooves.

[0012] Preferably, the projection device also includes a sound cavity, which is located in the shell, opposite to the air inlet, the optical engine, the fan, and the radiator are located between the sound cavity and the air inlet, and a curved channel of the air duct is formed between the sound cavity and the bracket, the air inlet is located at one end of the curved channel, and the fan, the radiator and the air outlet are located at the other end of the curved channel.

[0013] Preferably, the fan is located on a side of the radiator away from the air outlet, and is located between the optical engine and the radiator, and the air inlet side of the fan faces the optical engine.

[0014] Preferably, the water cooling device also includes a pump body and multiple sections of pipes, and the multiple sections of pipes are respectively connected between any two of the heat conduction plate, the pump body, and the radiator. The heat conduction plate, the pump body, and the radiator are connected through the pipes, and the air inlet side of the fan faces the heat conduction plate, the pipes, and the pump body.

[0015] Preferably, the fan includes a first sub-fan and a second sub-fan arranged side by side, the air inlet side of the first sub-fan faces the pump body, and the air inlet side of the second sub-fan faces the optical engine.

[0016] The beneficial effects of the present invention are as follows: the projection equipment disclosed in the present invention introduces a water cooling system, and the air inlet and the air outlet are respectively formed on two adjacent wall surfaces of the shell, which can shorten the air flow path and reduce obstacles in the heat dissipation channel; moreover, the heat conduction plate in the water cooling system is connected to the optical machine, and the air inlet side of the radiator is facing the optical machine, so that the heat of the optical machine can also be transferred to the radiator through the liquid medium, and then discharged through the air outlet located on the air outlet side of the radiator, thereby effectively improving the heat dissipation effect, significantly reducing the temperature of the optical machine, and ensuring that the picture quality can remain stable.

[0017] In a further embodiment, the present invention also has the following beneficial effects:

[0018] (1) The projection device is also provided with a bracket, so that the optical engine can be fixed on the bracket from the top and / or the side, without the need for a support column growing from the bottom of the housing for fixing. This avoids the problem in the prior art of the support column blocking the air duct due to the need to form a support column upward from the bottom of the housing to fix the optical engine.

[0019] (2) The projection device is also provided with a rigid support member so that both the left and right sides of the bracket can be supported, thereby preventing the additional support structure from blocking the heat dissipation channel.

[0020] (3) A baffle is formed on one side of the rigid support member close to the side wall of the housing forming the air inlet, which can prevent the hot air blown out from the radiator from flowing back and at the same time constrain and guide the air inlet area; and the baffle can be combined with the top plate and side plates connected to each other on the bracket to form a channel entrance of the air duct. This enclosure structure restricts the path of the airflow and allows more of the airflow to enter from the channel entrance of the air duct. There is no support column blocking the channel entrance to the optical engine and the fan, so the airflow is larger and can be blown more to the surface of the optical engine, thereby further improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 1 is a schematic diagram of the external structure of a projection device according to a preferred embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the projection device;

[0023] Figure 3 yes Figure 1 A schematic diagram of the internal structure of the air duct of the projection device on the channel inlet side;

[0024] Figure 4 yes Figure 2 A schematic diagram of the structure of the bracket of the projection equipment;

[0025] Figure 5 yes Figure 2 Schematic diagram of the internal structure of the projection device.

[0026] Description of Figure Numbers:

[0027] 10. Casing; 11. Air inlet; 12. Air outlet; 20. Fan; 21. First sub-fan; 22. Second sub-fan; 30. Water cooling system; 31. Heat transfer plate; 32. Pipeline; 33. Pump body; 34. Radiator; 40. Optical engine; 41. Light source; 42. Optical modulator; 50. Bracket; 51. Top plate; 52. Left side plate; 53. Right side plate; 54. Mounting cavity; 55. Support column; 56. Slide; 60. Rigid support member; 61. Baffle; 62. Air outlet avoidance port; 70. Sound cavity; 80. Air duct; 81. Channel entrance. DETAILED DESCRIPTION

[0028] The following is a detailed description of the embodiments of the present invention. It should be emphasized that the following description is only exemplary and is not intended to limit the scope of the present invention and its application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit / signal communication.

[0030] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0032] like Figure 1 and Figure 2As shown, a preferred embodiment of the present invention discloses a projection device, including a housing 10, a fan 20, a water cooling system 30 and an optical engine 40, with an air inlet 11 and an air outlet 12 respectively formed on two adjacent walls of the housing 10. The projection device is generally in the form of a rectangular parallelepiped, and the adjacent two side walls are, for example, the rear wall and bottom wall, the left wall and rear wall, the left wall and bottom wall, etc. of the housing 10. Figure 3 A heat dissipation channel can be formed between the air inlet 11 and the air outlet 12 in the housing 10, and the optical engine 40, the water cooling system 30 and the fan 20 are located in the heat dissipation channel; the water cooling system 30 includes a heat conducting plate 31, multiple sections of pipes 32, a pump body 33 and a cold radiator 34 that are connected to each other, and the multiple sections of pipes 32 are respectively connected between any two of the heat conducting plate 31, the pump body 33 and the cold radiator 34, and the heat conducting plate 31, the pump body 33 and the cold radiator are connected through the pipe 32. The heat conducting plate 31 is connected to the optical engine 40, and the air inlet side of the cold radiator 34 faces the optical engine 40, and the air outlet side faces the air outlet 12. The cold radiator 34 is mainly used to dissipate the heat in the coolant into the air, similar to a car radiator, by increasing the heat dissipation area and using a fan to accelerate the air flow to improve the heat dissipation efficiency. In this embodiment, the air inlet 11 is arranged on the rear wall of the housing 10, and the air outlet 12 is arranged on the bottom wall of the housing 10. The air inlet 11 and the air outlet 12 may be in the shape of a grid or a hole. It should also be noted that, in addition to the air inlet 11 and the air outlet 12 being provided on adjacent two side walls of the projection device, the projection device in some embodiments may also have ventilation holes provided on other side walls.

[0033] Generally, the radiator 34 transfers the heat in the liquid medium flowing through it to the air through the structure of flat copper tubes and wavy heat dissipation fins. A large number of wavy heat dissipation fins are regularly arranged and form a large number of air passages along the same direction. One side of the air passage is the air inlet side, and the other side is the air outlet side. This process realizes "liquid-gas" heat exchange, reduces the temperature of the liquid medium, and makes it at a lower temperature when it reaches the heat transfer plate 31 again, forming a circulating heat dissipation. In one embodiment, the heat transfer plate 31 and the pump body 33, the pump body 33 and the radiator 34, and the radiator 34 and the heat transfer plate 31 are respectively connected by different pipes 32, and the heat transfer plate 31 and the radiator 34 are provided with water flow channels to communicate with the pipes 32 respectively. The heat transfer plate 31, the pipe 32, the pump body 33 and the radiator 34 are connected to form a closed loop to realize the circulation of the liquid medium, and the pump body 33 provides the power for conveying the liquid medium entering therein. The liquid medium can absorb a large amount of heat from the higher temperature heat conducting plate 31 and flow to the lower temperature cold radiator 34, thereby transferring the heat to the surface of the cold radiator 34, specifically from the flat copper tube to the large number of corrugated heat sink fins. As the airflow inside the housing 10 flows through the cold radiator 34, the heat on the surface of the cold radiator 34 will be blown out of the housing 10. The number of heat conducting plates 31 is not limited to one. The number of heat conducting plates 31 and the area connected to the optical engine 20 can be set according to actual needs. In addition to being a rigid pipe, the pipe 32 can also be a soft rubber pipe.

[0034] In other embodiments, the water cooling system 30 may not be provided with an independent tubular pipe 32, but the heat conducting plate 31 and the radiator 34 may be provided in an integrated shell, and a water flow channel is formed in the shell to connect the heat conducting plate 31 and the radiator 34. At the same time, a pump is provided in the water flow channel to drive the liquid to flow. In this case, there is no need to provide a separate pump body 33.

[0035] Combine Figure 3 and Figure 4The projection device further includes a bracket 50, which includes a top plate 51, a left side plate 52, and a right side plate 53 connected to each other. The top plate 51, the left side plate 52, and the right side plate 53 surround a mounting cavity 54. The optical engine 40 is fixed to at least one of the top plate 51, the left side plate 52, and the right side plate 53 and is located in the mounting cavity 54. The fan 20 is located below the optical engine 40, and the optical engine 40 and the fan 20 are spaced apart to form an air duct 80. As described above, the optical engine 40 is fixed to the bracket 50 from above and / or from the side, eliminating the need for support columns growing from the bottom of the housing 10 for fixing. This avoids the problem of support columns blocking the air duct caused by forming support columns upward from the bottom of the housing 10 to fix the optical engine 40. Furthermore, the projection device also includes a plurality of fasteners. A plurality of support columns 55 are provided on the bracket 50. The support columns 55 are protruding from the bottom of the top plate 51 and / or the inner wall surface of the side plate (left plate 52 and / or right plate 53). The support columns 55 extend vertically toward the direction of the fan 20. The optical engine 40 is fixedly connected to the plurality of support columns 55 by a plurality of fasteners. In addition, the heat conducting plate 31, the pipe 32, and the pump body 33 are all spaced apart from the fan 70. In one embodiment, the pump body 33 is fixed to the right plate 53, and the optical engine 40 is fixed to the support columns of the top plate 51 and the left plate 52. The positions of the pump body 33 and the optical engine 40 form a left-right partition and are both facing the air inlet 11. The two will not block the airflow from each other and will not cause the device to be too thick.

[0036] Combine Figure 3 and Figure 5 The projection device also includes a rigid support member 60, which is located at the bottom of the housing 10 and fixed to the bottom ends of the left and right panels 52 and 53. The rigid support member 60 and the bracket 50 enclose a housing cavity. The radiator 34 is fixed to the rigid support member 60 and located within the housing cavity. The housing cavity forms an inlet 81 of the air duct 80 at one end near the air inlet 11, which faces the air inlet 11. The rigid support member 60 provides support on both sides of the bracket 50, avoiding the inlet 81 and preventing additional support structures from obstructing the heat dissipation channel. The rigid support member 60 can be made of a thin metal plate, such as sheet metal, to provide high strength and stability. The rigid support member 60 includes a bottom plate, which is located near the air outlet 12 of the housing 10. The bottom plate defines an air outlet avoidance opening 62, which faces the air outlet 12. The radiator 34 is fixed to the bottom plate, with the outlet side of the radiator 34 facing the air outlet avoidance opening 62.

[0037] A baffle 61 is formed on the side of the rigid support member 60 near the wall of the housing 10 that forms the air inlet 11. Baffle 61 is formed on the edge of the bottom plate near the rear wall of the housing 10, and baffle 61 and the bottom plate are perpendicular to each other. The fan 20 is fixed to the radiator 34 and is located between the radiator 34 and the optical engine 40. The fan 20 is stacked with the radiator 34 and can be an axial flow fan. The baffle 61 extends upward from the bottom of the accommodating cavity to the position of the fan 20, blocking the space between the fan 20 and the radiator 34 and between the radiator 34 and the bottom of the rigid support frame 60, to prevent the hot air blown out from the radiator 34 from flowing back, while restricting and narrowing the air inlet area; the baffle 61 and the top plate 51, the left plate 52 and the right plate 53 interconnected on the bracket 50 together surround the channel entrance 81 of the air duct 80. This enclosing structure restricts the path of the airflow and allows more of it to enter from the channel entrance 81 of the air duct 80. There is no support column blocking the channel entrance 81 to the optical engine 40 and the fan 20, so the airflow is larger and can be blown more to the surfaces of the optical engine 40, the heat conduction plate 31, the pipe 32 and the pump body 33, thereby achieving sufficient air cooling and heat dissipation at the same time.

[0038] Slide grooves 56 are provided on the outer surfaces of the two opposite side walls of the bracket 50, and protruding slide rails are provided on the inner side surfaces of the two opposite side walls of the shell 10. The slide rails are inserted into the slide grooves 56, so that when the bracket 50 is installed in the shell 10, it is overlapped on the slide rails through the slide grooves 56 and pushed into the interior of the shell 10 to obtain further support.

[0039] The projection device also includes a sound chamber 70, which is located within the housing 10, such as within the space enclosed by the bracket 50 and the rigid support frame 60. The back side of the sound chamber 70 faces the air inlet 11. The sound chamber 70 is provided with a speaker, which is located on the side of the sound chamber 70 facing away from the air inlet 11 and facing the front wall of the housing 10. The optical engine 40, fan 20, and radiator 34 are located between the sound chamber 70 and the air inlet 11. A curved channel 80 is formed between the sound chamber 70 and the bracket 50. The air inlet 11 is located at one end of the curved channel, and the fan 20, radiator 34, and air outlet 12 are located at the other end of the curved channel. After entering the air inlet 11, the external airflow is turned 90 degrees within the curved channel to reach the air outlet 12. Typically, the optical modulator is, for example, a digital micromirror device (DMD) or a liquid crystal on silicon (LCOS). The light beam emitted by the light source is regulated by optical elements such as lenses, diffusers, and reflectors before being directed onto the light modulator, forming a beam carrying image information. This beam is then amplified by the projection lens and projected out of the projection device. The light source 41 and light modulator 42 in the optical engine 40 generate the most heat. In this embodiment, the light source 41 and light modulator 42 are located on the side of the optical engine 40 near the air inlet 11 and within the curved channel. This structure further constrains the air duct 80, allowing more airflow to pass through the light source 41 and light modulator 42 of the optical engine 40.

[0040] The fan 20 is located on the side of the radiator 34 away from the air outlet 12, and is located between the optical engine 40 and the radiator 34, and the air inlet side of the fan 20 faces the optical engine 40, so that the air intake of the fan 20 is larger and is not blocked by the radiator 34. Furthermore, the air inlet side of the fan 20 also faces the heat conduction plate 31, the pipe 32 and the pump body 33. Furthermore, the fan 20 includes a first sub-fan 21 and a second sub-fan 22 arranged side by side, and the first sub-fan 21 and the second sub-fan 22 are arranged adjacent to each other along the length direction of the radiator 34, the air inlet side of the first sub-fan 21 faces the pump body 33 and part of the pipe 32, and the air inlet side of the second sub-fan 22 faces the optical engine 40 and another part of the pipe 32, so that in addition to water cooling, the first sub-fan 21 and the second sub-fan 22 can respectively achieve more effective air cooling and heat dissipation for the pipe 32, the pump body 33 and the optical engine 40.

[0041] Specifically, in one embodiment, the water cooling system 30 includes a plurality of heat conducting plates 31 , which are connected to the optical modulator 42 and each light source 41 respectively, so that the water cooling system 30 can achieve efficient heat dissipation for the core heat generating components in the optical engine 40 .

[0042] The projection device disclosed in the preferred embodiment of the present invention introduces a water cooling system 30 and defines the approximate position of the optical engine 40. The air inlet 11 is located on the rear wall of the projection device housing 10, and the air outlet 12 is opened on the bottom wall of the projection device housing 10. This can reduce the airflow distance, reduce obstacles, increase airflow, and further effectively improve heat dissipation efficiency. At the same time, the water cooling system 30 is connected to the light source 41 and / or light modulator 42 in the optical engine 40, which generate the most heat. The water cooling system 30 transfers heat to the radiator 34 located at the bottom of the housing 10 through a liquid medium. The fan 20 is located above the radiator 34. The fan 20 draws air in from the rear air inlet 11 and blows it toward the radiator 34. The air is then blown out through the air outlet 12 located at the bottom of the radiator 34 and directly opposite it, blowing out the most significant heat. This can significantly reduce the temperature of the optical engine 40 and ensure that the image quality can remain stable.

[0043] In summary, the projection device disclosed in the present invention can reduce the air flow distance by arranging the air inlets and outlets on the adjacent walls of the shell, which can help reduce obstacles such as support columns encountered during the circulation process. The optical engine is also located in the heat dissipation channel to achieve effective water cooling + air cooling of the optical engine, avoiding overheating of the optical engine, which can help maintain continuous high-quality display of the projection image.

[0044] The background section of the present invention may contain background information about the problem or environment of the present invention rather than describing prior art by others. Therefore, the inclusion of content in the background section is not an admission by the applicant that the prior art is available.

[0045] The above description further details the present invention in conjunction with specific / preferred embodiments, and the specific implementation of the present invention should not be construed as being limited to these descriptions. Persons skilled in the art will appreciate that, without departing from the spirit of the present invention, they may make various substitutions or modifications to the described embodiments, and these substitutions or modifications should be considered to fall within the scope of protection of the present invention. Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples" indicates that the specific features, structures, materials, or characteristics described in conjunction with such embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and assemble the different embodiments or examples described in this specification, as well as features from different embodiments or examples, without conflicting opinions. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions, and modifications may be made herein without departing from the scope of the appended claims.

Claims

1. A projection device, characterized in that: The invention comprises a shell, a fan, a water cooling system and an optical engine, wherein an air inlet and an air outlet are respectively formed on two adjacent wall surfaces of the shell, a heat dissipation channel is formed in the shell between the air inlet and the air outlet, and the optical engine, the water cooling system and the fan are located in the heat dissipation channel; the water cooling system comprises a connected heat conducting plate and a radiator, the heat conducting plate is connected to the optical engine, the air inlet side of the radiator faces the optical engine, and the air outlet side faces the air outlet.

2. The projection device according to claim 1, wherein: The optical machine further includes a bracket, which includes a top plate and side plates connected to each other, wherein the top plate and the side plates surround and form an installation cavity, and the optical machine is fixed to the top plate and / or the side plates and is located in the installation cavity; the fan is located below the optical machine, and the optical machine and the fan are spaced apart to form an air duct.

3. The projection device according to claim 2, characterized in that It also includes multiple fasteners, and the bracket is provided with multiple support columns, which are protruded from the bottom of the top plate and / or the inner wall of the side plate. The support columns extend toward the direction of the fan, and the optical engine is fixedly connected to the multiple support columns through the multiple fasteners.

4. The projection device according to claim 2, characterized in that It also includes a rigid support member, which is located at the bottom of the shell and fixed to the bottom end of the side panel, and the rigid support member and the bracket are enclosed to form a accommodating cavity, the radiator is fixed on the rigid support member and is located in the accommodating cavity, and the accommodating cavity forms a channel entrance of the air duct at one end close to the air inlet, and the channel entrance is opposite to the air inlet.

5. The projection device according to claim 4, characterized in that: The rigid support member forms a baffle on one side of the wall forming the air inlet on the outer shell, the fan is located between the radiator and the optical engine, and the baffle extends upward from the bottom of the accommodating cavity to the position of the fan. The baffle and the top plate and the side plates interconnected on the bracket together surround the channel entrance of the air duct.

6. The projection device according to claim 2, characterized in that Slide grooves are provided on the outer sides of the two opposite side walls of the bracket, and slide rails are provided on the inner sides of the two opposite side walls of the shell. The slide rails are inserted into the slide grooves.

7. The projection device according to claim 2, wherein: The optical machine, the fan, and the radiator are located between the acoustic cavity and the air inlet. A curved channel of the air duct is formed between the acoustic cavity and the bracket. The air inlet is located at one end of the curved channel, and the fan, the radiator, and the air outlet are located at the other end of the curved channel.

8. The projection device according to claim 1, wherein: The fan is located on a side of the radiator away from the air outlet and between the optical engine and the radiator, and the air inlet side of the fan faces the optical engine.

9. The projection device according to claim 1, wherein: The water cooling device also includes a pump body and multiple sections of pipes, and the multiple sections of pipes are respectively connected between any two of the heat conduction plate, the pump body, and the radiator. The heat conduction plate, the pump body, and the radiator are connected through the pipes, and the air inlet side of the fan faces the heat conduction plate, the pipes, and the pump body.

10. The projection device according to claim 9, characterized in that The fan includes a first sub-fan and a second sub-fan arranged side by side, the air inlet side of the first sub-fan faces the pump body, and the air inlet side of the second sub-fan faces the optical engine.

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