CN219105333U

CN219105333U - Projection apparatus

Info

Publication number: CN219105333U
Application number: CN202223570389.2U
Authority: CN
Inventors: 谭亮
Original assignee: Formovie Chongqing Innovative Technology Co Ltd
Current assignee: Formovie Chongqing Innovative Technology Co Ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-05-30
Anticipated expiration: 2032-12-30

Abstract

The utility model relates to projection equipment, which comprises a shell, wherein a first shell wall, a second shell wall and a third shell wall which are oppositely arranged are arranged on the shell, the first shell wall is provided with an air inlet, and the second shell wall is provided with an air outlet; the heat radiation fan is arranged at the air inlet or the air outlet; the optical machine assembly is arranged on the shell and comprises an optical machine main body and a mounting bracket, the optical machine main body is arranged on the mounting bracket, the mounting bracket comprises a guide plate, a first shell wall, a third shell wall and a second shell wall are combined together to form a guide air channel, and the guide air channel is respectively communicated with the air inlet and the air outlet. The air guide duct can guide the cold air entering the shell to flow to the air outlet from the air inlet rapidly and smoothly, so that heat generated by the operation of the main body of the optical machine can be rapidly discharged to the environment, the heat radiation efficiency is high, the flowing resistance of the cold air in the shell is small, the noise generation amount is reduced, the structural arrangement is compact and reasonable, the whole machine volume is reduced, and the use experience of a user is improved.

Description

Projection apparatus

Technical Field

The present utility model relates to the field of projection devices, and in particular, to a projection device.

Background

The projector, also called projector, is an electronic device capable of projecting images or videos onto a curtain or a curtain wall, and can be connected with a computer, a mobile phone, a television box, a game machine and other devices through different interfaces to play corresponding video signals. Today, projectors are widely used in homes, offices, schools, and entertainment venues, providing great convenience for people's life, learning, and entertainment.

Generally, the duration of a single working period of the projector is long, and a large amount of heat can be emitted from an optical machine component in the projector due to long-time working, so that the heat in the projector needs to be rapidly discharged, and the influence on the service performance and service life of the optical machine component due to long-time high-temperature environment is avoided. However, most projectors on the market currently have complicated installation and fixing structures of the optical-mechanical components, and poor air flow, which results in poor heat dissipation effect and low heat dissipation efficiency of the optical-mechanical components.

Disclosure of Invention

Based on this, it is necessary to provide a projection device, and it is high to aim at solving prior art heat dissipation cost, and the complete machine is bulky, and the noise is big, and radiating efficiency is low, influences the problem of user's use experience.

The application provides a projection device comprising:

the shell comprises a first shell wall, a second shell wall and a third shell wall, wherein the first shell wall and the second shell wall are oppositely arranged, the third shell wall is connected between the first shell wall and the second shell wall, the first shell wall is provided with an air inlet, and the second shell wall is provided with an air outlet;

the optical machine assembly is arranged in the shell and comprises an optical machine main body and a mounting bracket, the mounting bracket comprises a guide plate, a guide air channel is formed by matching among the guide plate, the first shell wall, the third shell wall and the second shell wall, the guide air channel is respectively communicated with the air inlet and the air outlet, and the optical machine main body is arranged on the mounting bracket and is positioned in the guide air channel; and

and the cooling fan is arranged at the air inlet or the air outlet and is positioned in the diversion air duct.

When the projection equipment of the scheme works, the cooling fan rotates to enable cold air in an external environment to enter the shell, and as the guide plate of the mounting bracket, the first shell wall, the third shell wall and the second shell wall are surrounded to form the guide air duct, the light machine main body and the cooling fan are both positioned in the guide air duct, the guide air duct can guide the cold air entering the shell to flow from the air inlet to the air outlet quickly and smoothly, so that heat generated by the work of the light machine main body can be quickly discharged to the environment, the heat dissipation efficiency is high, and the heat dissipation effect is good; in addition, ray apparatus main part is installed in enclosing the water conservancy diversion wind channel of establishing formation by guide plate, first shell wall, second shell wall and third shell wall, and installation fixed mode and simple structure, first shell wall and second shell wall can not form the choked flow to cold air, are favorable to noise reduction production volume, promote user's use experience and feel.

The technical scheme of the application is further described below:

in one embodiment, the cooling fan is mounted on the air inlet, a first side of the guide plate is abutted with an inner side wall of the first shell wall or an edge of the cooling fan, and a second side of the guide plate is abutted with an inner side wall of the second shell wall.

In one embodiment, the cooling fan is mounted at the air outlet, the first side of the guide plate is abutted with the inner side wall of the first shell wall, and the second side of the guide plate is abutted with the inner side wall of the second shell wall or the edge of the cooling fan.

In one embodiment, the mounting bracket further comprises a first side plate and a second side plate which are oppositely arranged, the first side plate and the second side plate are respectively provided with a vent hole, the first side plate and the second side plate are installed on the same side of the guide plate at intervals, and the optical machine main body is installed in the interval between the first side plate and the second side plate.

In one embodiment, a clearance gap is concavely formed at the upper end of the guide plate, a lens is connected to one side of the light machine main body, which faces the guide plate, and is inserted into the clearance gap, the first side plate and the second side plate are respectively located at two opposite sides of the light machine main body, the shell further comprises a fourth shell wall which is arranged opposite to the third shell wall, and the fourth shell wall is provided with a light outlet corresponding to the lens.

In one embodiment, the optical engine assembly further comprises a light source heat sink, the light source heat sink being connected to the optical engine body.

In one embodiment, the light source radiator includes a first heat dissipation portion and a second heat dissipation portion that are connected, the first heat dissipation portion is connected to one side of the light machine main body, which is away from the guide plate, the second heat dissipation portion extends along the direction of the first heat dissipation portion towards the guide plate, the first side plate or the second side plate is disposed between the second heat dissipation portion and the light machine main body, and the first heat dissipation portion exceeds the first side plate or the second side plate in the direction away from the guide plate.

In one embodiment, the light engine body further includes an imaging unit heat sink, the imaging unit heat sink is connected with the light engine body, and the imaging unit heat sink is disposed above the light source heat sink.

In one embodiment, the projection device further includes a circuit board assembly, the circuit board assembly is disposed on the mounting bracket and located above the light source radiator, and the circuit board assembly and the optical machine assembly are disposed opposite to the heat dissipation fan.

In one embodiment, the projection device further includes a first sound box and a second sound box, where the first sound box and the second sound box are respectively disposed on two sides of the optical machine assembly; the first sound box is arranged between the guide plate and the fourth shell wall, and is provided with a groove for avoiding the lens; the second sound box is arranged between the light source radiator and the shell, and the light source radiator is provided with a avoidance space for avoiding the second sound box.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of a projection device of the present application;

FIG. 2 is an assembled block diagram of the projection device of FIG. 1;

FIG. 3 is a schematic view of the structure of FIG. 2 from another perspective;

FIG. 4 is an assembly block diagram of an opto-mechanical assembly and a mounting bracket;

fig. 5 is a schematic structural view of the mounting bracket.

Reference numerals illustrate:

10. a projection device; 11. a housing; 111. a first housing wall; 111a, an air inlet; 112. a second housing wall; 112a, an air outlet; 113. a third shell wall; 114. a fourth housing wall; 12. a heat radiation fan; 13. an opto-mechanical assembly; 131. a light machine main body; 1311. a lens; 1312. a light source radiator; 1312a, a first heat sink; 1312b, a second heat sink; 1313. an imaging unit heat sink; 132. a mounting bracket; 1321. a deflector; 1321a, clearance gap; 1322. a first side plate; 1322a, vent holes; 1323. a second side plate; 14. a circuit board assembly; 15. a first sound box; 16. a second sound box; 20. and a diversion air duct.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

As shown in fig. 1 and 2, a projection device 10 is shown in an embodiment of the present application, which is capable of projecting images or videos onto a curtain or curtain wall to meet the needs of a user for work, learning or entertainment.

Illustratively, the projection device 10 includes: a housing 11, a heat radiation fan 12, and an optical machine component 13. The shell 11 is of a square column structure, is simple and regular in structure, and is convenient and stable to place on a placing plane (such as a tabletop) for use. Of course, in other embodiments, the housing 11 may have a regular or irregular structure such as a cylindrical shape, a trapezoid shape, a triangular shape, etc.

The housing 11 includes a first housing wall 111, a second housing wall 112, and a third housing wall 113 connected between the first housing wall 111 and the second housing wall 112, where the first housing wall 111 has an air inlet 111a, and the second housing wall 112 has an air outlet 112a. That is, the air inlet 111a, the air guide duct 20 and the air outlet 112a cooperate to form an air circulation path so as to discharge heat from the interior of the housing 11.

In this embodiment, the air inlet 111a and the air outlet 112a may be any one of a large-area opening, a ventilation grille, and the like. Preferably, the air inlet 111a and the air outlet 112a adopt ventilation grids, such as point-shaped grids or bar-shaped grids, which not only meet the air and heat circulation requirements, but also can prevent dust, mosquitoes and other dust in the external environment from entering the machine body, and have better anti-theft effect.

In addition, the heat dissipation fan 12 is disposed at the air inlet 111a or the air outlet 112a. For example, the heat radiation fan 12 is installed at the air intake 111a in the present embodiment. Of course, according to practical needs, at least one cooling fan 12 may be installed at both the air inlet 111a and the air outlet 112a to further enhance the air and heat flowing capability.

With continued reference to fig. 2 to 5, the optical module 13 is disposed in the housing 11, and the optical module 13 includes an optical module body 131 and a mounting bracket 132, the mounting bracket 132 includes a guide plate 1321, a guide air duct 20 is formed by matching the guide plate 1321, the first housing wall 111, the third housing wall 113 and the second housing wall 112, and the guide air duct 20 is respectively communicated with the air inlet 111a and the air outlet 112a. The ray apparatus main body 131 and the cooling fan 12 are both located in the air guide duct 20.

When the projection device 10 of the above-mentioned scheme works, the cooling fan 12 rotates to enable cold air in the external environment to enter the interior of the housing 11, and as the guide plate 1321 of the mounting bracket 132, the first housing wall 111, the third housing wall 113 and the second housing wall 112 enclose the guide air duct 20, the optical machine main body 131 and the cooling fan 12 are both positioned in the guide air duct 20, the guide air duct 20 can guide and flow the cold air entering the housing 11 from the air inlet 111a to the air outlet 112a quickly and smoothly, so that heat generated by the operation of the optical machine main body 131 can be discharged to the environment quickly, and the heat dissipation efficiency is high; in addition, the optical engine main body 131 is installed in the air guide duct 20 formed by surrounding the air guide plate 1321, the first shell wall 111, the second shell wall 112 and the third shell wall 113, and the installation and fixation mode and the structure are simple, and the first shell wall 111 and the second shell wall 112 can not form choked flow to cold air, so that noise generation amount is reduced, and user experience is improved.

It can be appreciated that the cooling fan 12 is mounted on the air inlet 111a, the first side of the guide plate 1321 is abutted against the inner side wall of the first housing wall 111 or the edge of the cooling fan 12, and the second side of the guide plate 1321 is abutted against the inner side wall of the second housing wall 112. Alternatively, the heat dissipation fan 12 is mounted at the air outlet 112a, the first side of the deflector 1321 is in contact with the inner side wall of the first housing wall 111, and the second side of the deflector 1321 is in contact with the inner side wall of the second housing wall 112 or the edge of the heat dissipation fan 12. The air guide duct 20 with a relatively closed structure is formed, cold air is prevented from flowing randomly in the shell 11, so that the cold air entering the shell 11 from the outside can flow more strictly along the air guide duct 20, and heat generated by the optical machine main body 131 is carried and dissipated to the outside of the machine body more quickly and effectively, and a better heat dissipation and cooling effect is achieved.

With continued reference to fig. 5, further, the mounting bracket 132 further includes a first side plate 1322 and a second side plate 1323 disposed opposite to each other, the first side plate 1322 and the second side plate 1323 are provided with ventilation holes 1322a, the first side plate 1322 and the second side plate 1323 are mounted on the same side of the guide plate 1321 at intervals, and the optical bench body 131 is mounted in the interval between the first side plate 1322 and the second side plate 1323.

It will be appreciated that the first side plate 1322 and the second side plate 1323 are perpendicular to the air flow direction in the air guiding duct 20, or are angled.

The opposite sides of the guide plate 1321 along the flow direction of the cool air in the guide air duct 20 extend beyond the first side plate 1322 and the second side plate 1323 by a certain length, which facilitates the installation and positioning of the guide plate 1321 and forms the guide air duct 20 with a sufficient space.

When the projection device 10 works, the cooling fan 12 rotates to enable cold air in the external environment to enter the air guide duct 20, and the cold air flows through the ventilation holes 1322a of the first side plate 1322 of the host bracket, so that heat generated by the optical engine main body 131 can be taken away from the ventilation holes 1322a of the second side plate 1323, and finally the heat is discharged out of the shell 11 from the air outlet 112a, thereby realizing cooling and heat dissipation of the projection device 10. Compared with the prior art, the cold air in this scheme flows through the air inlet 111a, the air guide duct 20 and the air outlet 112a in sequence, the heat generated by the operation of the optical engine main body 131 can be rapidly discharged to the environment, the heat dissipation efficiency is high, the first side plate 1322 and the second side plate 1323 can not form choked flow to the cold air, the noise generation amount is reduced, and the structure arrangement is compact and reasonable, the whole machine volume is reduced, and the user experience is improved.

The number, shape, size, etc. of the ventilation holes 1322a formed in the first side plate 1322 and the second side plate 1323 may be the same or different. The ventilation holes 1322a may be located in a partial area of the first side plate 1322 and the second side plate 1323, or may be fully distributed in the whole plate body. These can all be flexibly selected according to actual needs.

Alternatively, the first side plate 1322, the second side plate 1323, and the deflector 1321 may be detachably assembled, or may be integrally formed. In addition, the mounting bracket 132 further includes a bottom plate, and the first side plate 1322, the second side plate 1323 and the guide plate 1321 are all connected to an upper surface of the bottom plate, and the bottom plate is used for assembling and connecting the mounting bracket 132 with the housing 11.

Further, a hollow space 1321a is concavely formed at the upper end of the guide plate 1321, a lens 1311 is connected to one side of the optical engine main body 131 facing the guide plate 1321, the lens 1311 is inserted into the hollow space 1321a, and the first side plate 1322 and the second side plate 1323 are respectively located at two opposite sides of the lens 1311. The void 1321a can accommodate the lens 1311, avoiding the problem of installation interference, and the void 1321a also plays a role in positioning and supporting the lens 1311. Alternatively, the void 1321a may be C-shaped, U-shaped, or the like.

It should be noted that, no ventilation hole is formed on the guide plate 1321, so as to ensure the guide effect of the guide plate 1321 on the cool air.

As shown in fig. 2, the housing 11 further includes a fourth housing wall 114 disposed opposite to the third housing wall 113, and the fourth housing wall 114 is provided with a light outlet corresponding to the lens 1311. Fourth housing wall 114 prevents lens 1311 from being blocked, and the light outlet ensures that lens 1322 is working properly.

With continued reference to fig. 2 to 5, the optical engine assembly 13 further includes a light source heat sink 1312, where the light source heat sink 1312 is connected to the optical engine body 131. Specifically, the optical engine main body 131 includes a light source unit, in which a laser light source, an LED light source, or a laser fluorescent light source is disposed, and a light source heat sink 312 is connected to the light source unit 313. When the air conditioner works, the light source radiator 1312 can conduct heat generated by the air conditioner main body 131 into the air guide duct 20, so that the heat dissipation efficiency of the air conditioner main body 131 is enhanced, and the cool air can take away the heat more quickly.

Preferably, the housing of the optical engine body 131 is made of metal material, such as aluminum alloy, stainless steel, etc., so as to ensure heat transfer and dissipation capability.

Specifically, the light source radiator 1312 includes a first radiating portion 1312a and a second radiating portion 1312b connected together, the first radiating portion 1312a is connected to a side of the optical engine main body 131 facing away from the deflector 1321, the second radiating portion 1312b extends along the first radiating portion 1312a toward the deflector 1321, and the first side plate 1322 or the second side plate 1323 is disposed between the second radiating portion 1312b and the optical engine main body 131. The first heat dissipation portion 1312a extends beyond the first side plate 321 or the second side plate 322 in a direction away from the flow guide plate 323, that is, at least a portion of the first heat dissipation portion 1312a is outside the installation space formed by the mounting bracket 32. For example, when the first side plate 1322 is disposed toward the air inlet 111a, the second side plate 1323 is disposed toward the air outlet 112a, and the second side plate 1323 is disposed between the second heat dissipation portion 1312b and the optical engine main body 131, the heat generated by the optical engine main body 131 is transferred to the first heat dissipation portion 1312a and the second heat dissipation portion 1312b, and after the cooling fan 12 makes the cooling air enter the housing, a part of the cooling air directly flows through the first heat dissipation portion 1312a to take away the heat on the first heat dissipation portion 1312 a; the other part of air-cooled air firstly flows through the ventilation holes 1322a on the first side plate 1322, flows through the optical machine main body 131, takes away the heat generated by the optical machine main body 131, flows out through the ventilation holes 1322a on the second side plate 1323, then flows through the second heat dissipation part 1312b, takes away the heat on the second heat dissipation part 1312b, or the other part of air-cooled air firstly flows through the second heat dissipation part 1312b, takes away the heat on the second heat dissipation part 1312b, flows through the ventilation holes 1322a on the first side plate 1322, flows through the optical machine main body 131, takes away the heat generated by the optical machine main body 131, and flows out through the ventilation holes 1322a on the second side plate 1323. The first heat dissipation portion 1312a and the second heat dissipation portion 1312b are the bare engine main body 131, so that the heat dissipation area of the light source heat sink 312 is increased, and the heat dissipation efficiency of the bare engine main body 131 can be further improved.

In some embodiments thereof, the bare engine body 131 further comprises an imaging unit heat sink 1313, the imaging unit heat sink 1313 being connected to the bare engine body 131, the imaging unit heat sink 1313 being disposed above the light source heat sink 1312.

In this embodiment, the optical engine main body 131 further includes an imaging unit, the imaging unit is connected above the light source unit, and the lens 1311 is connected to the light emitting side of the imaging unit. The imaging unit is internally provided with a light modulator such as DMD, LCoS and the like, and the light modulator is used for modulating light rays emitted by the light source unit into projection images. The light source heat sink 1312 is connected to the light source unit to dissipate heat from the light source unit, and the imaging unit heat sink 1313 is connected to the imaging unit to dissipate heat from the imaging unit. Therefore, heat generated by the light source unit and the imaging unit can be conducted more quickly, and heat dissipation efficiency is improved.

In addition, the projection device 10 further includes a circuit board assembly 14, the circuit board assembly 14 is disposed in the upper region of the housing 11 and is located in the air guide duct 20, the circuit board assembly 14 and the optical machine assembly 13 are disposed opposite to the cooling fan 12, and the circuit board assembly 14 is disposed on the mounting bracket 132 and is located above the light source radiator 1321. For example, in the embodiment, the cooling fan 12 is disposed at the air inlet 111a, and the circuit board assembly 14 and the optical unit 13 are opposite to the cooling fan 12, so that when the cooling fan 12 works, the cooling air flowing in from the air inlet 111a can directly blow the circuit board assembly 14 and the optical unit 13, thereby taking away heat more quickly and better.

In this embodiment, the circuit board assembly 14 and the optical machine assembly 13 are vertically stacked, so that the circuit board assembly 14 and the optical machine assembly 13 can be ensured to be connected more compactly, the space occupation of the housing 11 is reduced, and the projection device 10 is facilitated to reduce the volume so as to realize the miniaturization design.

With continued reference to fig. 1, in some embodiments, the projection apparatus 10 further includes a first speaker 15 and a second speaker 16, where the first speaker 15 and the second speaker 16 are disposed on two sides of the optical-mechanical assembly 13, respectively. Specifically, the first speaker 15 and the second speaker 16 may be disposed on opposite sides or adjacent sides of the opto-mechanical assembly 13, respectively. The first sound box 15 and the second sound box 16 can meet the audio playing requirement of the projection device 10.

The first sound box 15 is disposed between the guide plate 1321 and the fourth housing wall 114, and the first sound box 15 is provided with a groove for avoiding the lens 1311. The second sound box 16 is disposed between the light source radiator 1312 and the housing 11, and the light source radiator 1312 is provided with a space for avoiding the second sound box 16. In this way, the first speaker 15 and the lens 1311 are assembled more compactly, and the light source radiator 1312 and the second speaker 16 are assembled more compactly, thereby facilitating the miniaturization design of the projection apparatus.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

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

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Claims

1. A projection device, comprising:

2. The projection device of claim 1, wherein the cooling fan is mounted to the air inlet, a first side of the baffle is in contact with an inner side wall of the first housing wall or an edge of the cooling fan, and a second side of the baffle is in contact with an inner side wall of the second housing wall.

3. The projection device of claim 1, wherein the cooling fan is mounted to the air outlet, a first side of the baffle is in contact with an inner side wall of the first housing wall, and a second side of the baffle is in contact with an inner side wall of the second housing wall or an edge of the cooling fan.

4. The projection device of claim 1, wherein the mounting bracket further comprises a first side plate and a second side plate disposed opposite to each other, the first side plate and the second side plate are each provided with a vent hole, the first side plate and the second side plate are spaced apart from each other and mounted on the same side of the baffle, and the optical machine body is mounted in a space between the first side plate and the second side plate.

5. The projection device of claim 4, wherein a clearance gap is concavely formed at an upper end of the guide plate, a lens is connected to one side of the light machine body facing the guide plate, the lens is inserted into the clearance gap, the first side plate and the second side plate are respectively located at two opposite sides of the light machine body, the housing further comprises a fourth housing wall opposite to the third housing wall, and the fourth housing wall is provided with a light outlet corresponding to the lens.

6. The projection device of claim 5, wherein the light engine assembly further comprises a light source heat sink coupled to the light engine body.

7. The projection device of claim 6, wherein the light source heat sink comprises a first heat sink portion and a second heat sink portion connected to each other, the first heat sink portion being connected to a side of the light engine body facing away from the baffle, the second heat sink portion extending in a direction of the first heat sink portion toward the baffle, the first side plate or the second side plate being disposed between the second heat sink portion and the light engine body, the first heat sink portion extending beyond the first side plate or the second side plate in a direction facing away from the baffle.

8. The projection device of claim 6, wherein the light engine body further comprises an imaging unit heat sink, the imaging unit heat sink is coupled to the light engine body, and the imaging unit heat sink is disposed above the light source heat sink.

9. The projection device of claim 6, further comprising a circuit board assembly disposed on the mounting bracket above the light source heat sink, the circuit board assembly and the opto-mechanical assembly each disposed directly opposite the heat dissipating fan.

10. The projection device of claim 6, further comprising a first speaker and a second speaker, the first speaker and the second speaker being disposed on respective sides of the opto-mechanical assembly; the first sound box is arranged between the guide plate and the fourth shell wall, and is provided with a groove for avoiding the lens; the second sound box is arranged between the light source radiator and the shell, and the light source radiator is provided with a avoidance space for avoiding the second sound box.