CN115308981B

CN115308981B - Projection apparatus

Info

Publication number: CN115308981B
Application number: CN202211023985.0A
Authority: CN
Inventors: 陈禅豪; 胡全友; 江浩
Original assignee: Formovie Chongqing Innovative Technology Co Ltd
Current assignee: Formovie Chongqing Innovative Technology Co Ltd
Priority date: 2022-08-24
Filing date: 2022-08-24
Publication date: 2024-03-15
Anticipated expiration: 2042-08-24
Also published as: CN115308981A

Abstract

The invention relates to projection equipment, which comprises a shell, a light machine, a sound box and a heat radiation component. The sound box is arranged in the inner cavity of the shell, and the inner cavity is divided into a heat dissipation cavity and a sound box cavity which are independent from each other. The casing is equipped with fresh air inlet, fresh air outlet and intercommunicating pore, intercommunicating pore and audio amplifier chamber intercommunication, fresh air inlet and fresh air outlet all communicate with the heat dissipation chamber. The loudspeaker and the passive radiator of the sound box are arranged in the sound box cavity, the optical engine and the heat dissipation assembly are arranged in the heat dissipation cavity, the heat dissipation assembly comprises a fan, and the fan drives cooling air flow to enter the heat dissipation cavity through the air inlet and to be discharged from the air outlet. In the projection process, the passive radiator of the sound box vibrates to push air in the cavity of the sound box to escape from the communication hole, so that pneumatic noise is avoided, and the sound quality effect is improved. Because the inner chamber of casing is separated into independent heat dissipation chamber and audio amplifier chamber each other, fresh air inlet and apopore all communicate with the heat dissipation chamber, and intercommunicating pore and audio amplifier chamber intercommunication, the intercommunicating pore can not influence the cooling air current in and out the heat dissipation chamber like this, guarantees that heat dispersion and acoustic performance do not mutually interfere.

Description

Projection apparatus

Technical Field

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

Background

The projection device can project video, images, characters, etc. onto a curtain for display, and is widely used in houses, offices, schools, movie theatres, etc.

Typically, the interior of the projection device is equipped with a heat sink assembly and a sound box. In the projection process, the heat dissipation component drives cooling air flow to flow in the projection equipment so as to dissipate heat of devices such as an optical machine in the projection equipment; simultaneously, the sound box can promote the air flow in the projection equipment through the sound hole outwards propagation sound, at the in-process of sound broadcast. However, the cooling air flow and the air flow pushed by the sound box interfere with each other, resulting in the heat dissipation performance of the heat dissipation assembly and the acoustic performance of the sound box being affected.

Disclosure of Invention

Based on this, it is necessary to provide a projection apparatus that ensures that the heat dissipation performance and the acoustic performance of the projection apparatus do not interfere with each other.

A projection device comprises a shell, a sound box, an optical machine and a heat dissipation assembly:

the shell is provided with an inner cavity, the sound box is arranged in the inner cavity, and the inner cavity is divided into a heat dissipation cavity and a sound box cavity which are independent from each other; the shell is provided with an air inlet hole, an air outlet hole and a communication hole, the communication hole is communicated with the sound box cavity, the air inlet hole and the air outlet hole are both communicated with the heat dissipation cavity, the sound box comprises a loudspeaker and a passive radiator, and the loudspeaker and the passive radiator are both arranged in the sound box cavity;

The ray apparatus with the cooling module is all located in the heat dissipation chamber, the cooling module includes the fan, the fan is used for driving the cooling air current follow the fresh air inlet get into in the heat dissipation chamber and follow the apopore discharges, in order to take away the heat that the ray apparatus produced.

In one embodiment, the housing further comprises a bottom wall and a top wall opposite to the bottom wall, the bottom wall of the housing comprises a plane portion and an inclined portion, the inclined portion extends obliquely from the periphery of the plane portion to the direction of the top wall of the housing, and the air inlet, the air outlet and the communication hole are all formed in the inclined portion.

In one embodiment, a wind shielding part is arranged on the inner side of the shell, the projection device further comprises a wind blocking piece, and the wind blocking piece is arranged between the wind shielding part and the sound box and is respectively abutted against the wind shielding part and the sound box so as to divide the inner cavity of the shell into the heat dissipation cavity and the sound box cavity which are independent of each other.

In one embodiment, the wind shielding part comprises a first wind shielding rib, the first wind shielding rib extends from the inclined part on one side of the plane part to the inclined part on the other side of the plane part through the plane part, and the sound box is arranged between the first wind shielding rib and the top wall of the shell.

In one embodiment, the choke piece further comprises a first choke piece, the first choke piece is arranged between the first wind shielding convex rib and the sound box, and two sides of the first choke piece are respectively in butt fit with the first wind shielding convex rib and the sound box.

In one embodiment, the wind shielding part further comprises a second wind shielding convex rib, a third wind shielding convex rib, a fourth wind shielding convex rib and a fifth wind shielding convex rib, the second wind shielding convex rib and the third wind shielding convex rib are both arranged on the inclined part and are respectively arranged on two opposite sides of the plane part, the fourth wind shielding convex rib and the fifth wind shielding convex rib are correspondingly arranged on the inner side of the top wall of the shell, the second wind shielding convex rib and the fourth wind shielding convex rib are in butt joint, the third wind shielding convex rib and the fifth wind shielding convex rib are in butt joint, and one side of the sound box, facing the optical machine, is in butt joint with the second wind shielding convex rib, the third wind shielding convex rib, the fourth wind shielding convex rib and the fifth wind shielding convex rib.

In one embodiment, the choke piece further comprises a second choke piece and a third choke piece, the second choke piece is arranged between one side of the sound box facing the optical machine and the second wind shielding convex rib and the fourth wind shielding convex rib, one side of the second choke piece is in butt fit with one side of the sound box facing the optical machine, and the other side of the second choke piece is in butt fit with the second wind shielding convex rib and the fourth wind shielding convex rib; the third choke piece is arranged between one side of the sound box, which faces the optical machine, and the third wind shielding convex rib and the fifth wind shielding convex rib, one side of the third choke piece is in butt fit with one side of the sound box, which faces the optical machine, and the other side of the third choke piece is in butt fit with the third wind shielding convex rib and the fifth wind shielding convex rib respectively.

In one embodiment, a light source is connected to one side of the optical engine, the heat dissipation assembly further comprises a first heat radiator, the first heat radiator is arranged on one side, away from the optical engine, of the light source and is in heat conduction connection with the light source, and the fan is used for driving cooling air flow entering the heat dissipation cavity from the air inlet hole to blow to the first heat radiator and be discharged from the air outlet hole.

In one embodiment, the inclined part is provided with a communication area corresponding to the sound box cavity, an air inlet area corresponding to the heat dissipation cavity and an air outlet area, the air inlet area, the air outlet area and the communication area are arranged along the circumferential direction of the inclined part at intervals, the air inlet is arranged in the air inlet area, the air inlet area and the optical machine are oppositely arranged, the air outlet is arranged in the air outlet area, the air outlet area and the first radiator are oppositely arranged, the first radiator is provided with a second air outlet, the second air outlet and the air outlet are oppositely and communicated, the communication hole is arranged in the communication area, and the communication area and the sound box are oppositely arranged.

In one embodiment, the projection device further comprises a base pad, wherein the base pad is arranged on the plane part; at least part of the air inlet area and at least part of the air outlet area are respectively positioned at two opposite sides of the plane part, the bottom pad is of an annular structure, and the bottom pad is arranged at the periphery of the plane part along the circumferential direction of the plane part.

In one embodiment, the inclined part is provided with a plurality of strip-shaped holes, and the strip-shaped holes extend from one side of the inclined part close to the plane part to one side of the inclined part far away from the plane part and are arranged at intervals along the circumferential direction of the inclined part; the strip-shaped hole opposite to the optical machine is the air inlet hole, the strip-shaped hole opposite to the second air outlet of the first radiator is the air outlet hole, and the strip-shaped hole opposite to the sound box is the communication hole; the strip-shaped holes are blind holes among the air inlet holes, the air outlet holes, the communication holes and the air inlet holes.

According to the projection equipment, in the projection process, the fan drives the cooling air flow to enter the heat dissipation cavity through the air inlet and is discharged from the air outlet so as to take away heat generated by the optical machine, and heat dissipation of the projection equipment is achieved. At the in-process of projection, the passive radiator of audio amplifier can vibrate, promotes the air flow of audio amplifier intracavity, promotes the speed of air current very fast moreover, through set up the intercommunicating pore with the audio amplifier chamber intercommunication at the diapire of casing, the intercommunicating pore makes the air current escape, avoids producing pneumatic noise, promotes tone quality effect. Because the inner chamber of casing is separated into independent heat dissipation chamber and audio amplifier chamber each other, fresh air inlet and apopore all communicate with the heat dissipation chamber, and intercommunicating pore and audio amplifier chamber intercommunication, the intercommunicating pore can not influence the cooling air current in and out the heat dissipation chamber like this, guarantees projection equipment's heat dispersion and acoustic performance mutually noninterfere.

Drawings

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

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view of a projection device according to an embodiment of the present invention;

FIG. 2 is an exploded view of the projection device of FIG. 1;

FIG. 3 is a schematic view of a portion of the projection device shown in FIG. 2;

FIG. 4 is a schematic view of the structure of the top housing of the projection device shown in FIG. 2;

FIG. 5 is a schematic view of a bottom case of the projection apparatus shown in FIG. 2;

FIG. 6 is a schematic view of the bottom case of the projection apparatus shown in FIG. 5 from another perspective;

FIG. 7 is a cross-sectional view of the projection device shown in FIG. 1;

FIG. 8 is a schematic diagram of a blower and a first heat sink of the projection device shown in FIG. 2;

Fig. 9 is a cross-sectional view taken along A-A in fig. 8.

Reference numerals illustrate: 10. a housing; 11. a bottom case; 111. a planar portion; 112. an inclined portion; 1121. an air inlet hole; 1122. an air outlet hole; 1123. a communication hole; 113. a wind shielding part; 1131. the first wind shielding convex rib; 11311. a first rib section; 11312. the second convex rib section; 11313. a third rib section; 1132. the second wind shielding convex rib; 1133. a third wind shielding convex rib; 12. a top shell; 121. a fourth wind shielding rib; 122. fifth wind shielding convex ribs; 123. a temperature equalizing layer; 124. a first sidewall; 125. a second sidewall; 126. a third sidewall; 127. a fourth sidewall; 128. a sound outlet hole; 13. an inner cavity; 131. a heat dissipation cavity; 132. a sound box cavity; 14. a first interval; 15. a second interval; 16. a choke member; 161. a first choke member; 162. a second choke member; 163. a third choke member; 19. a bottom pad; 20. a light machine; 21. a light source; 22. a projection lens; 30. a blower; 31. a first air outlet; 32. a first air inlet; 33. a second air inlet; 40. a first heat sink; 41. an air outlet end; 411. a second air outlet; 42. an air inlet end; 421. a third air inlet; 43. a first heat radiating fin; 431. a first side; 432. a second side; 44. a thermal insulation layer; 45. a sealing layer; 46. a flow equalizer; 461. a first tuyere; 462. a second tuyere; 463. a flow equalizing channel; 50. a sound box; 51. a speaker; 52. a passive radiator; 60. a circuit board; 70. a second heat sink; 80. and a third heat sink.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention 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 invention. The present invention 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 invention, whereby the invention is not limited to the specific embodiments disclosed below.

Referring to fig. 1, 2, 3 and 6, a projection apparatus according to an embodiment of the invention includes a housing 10, a light engine 20, a speaker 50 and a heat dissipation assembly. The housing 10 has an inner cavity 13, the sound box 50 is provided in the inner cavity 13, and the inner cavity 13 is divided into a heat dissipation cavity 131 and a sound box cavity 132 which are independent from each other. The housing 10 is provided with an air inlet 1121, an air outlet 1122 and a communication hole 1123, the communication hole 1123 is communicated with the sound box cavity 132, and the air inlet 1121 and the air outlet 1122 are both communicated with the heat dissipation cavity 131. The enclosure 50 includes a speaker 51 and a passive radiator 52, both the speaker 51 and the passive radiator 52 being disposed within the enclosure cavity 132. The optical engine 20 and the heat dissipation assembly are both disposed in the heat dissipation cavity 131, the heat dissipation assembly includes a fan 30, and the fan 30 is used for driving cooling air flow into the heat dissipation cavity 131 through the air inlet 1121 and discharging the cooling air from the air outlet 1122, so as to take away heat generated by the optical engine 20.

In the projection process, the fan 30 drives the cooling air flow to enter the heat dissipation cavity 131 through the air inlet 1121 and to be discharged from the air outlet 1122, so as to take away the heat generated by the optical engine 20, thereby realizing heat dissipation of the projection device. In the projection process, the passive radiator 52 of the sound box 50 vibrates to push air in the sound box cavity 132 to flow, the speed of pushing air flow is very high, and the air flow is dissipated through the communication hole 1123 communicated with the sound box cavity 132 arranged on the bottom wall of the shell 10, so that pneumatic noise is avoided, and the sound quality effect is improved. Since the inner cavity 13 of the housing 10 is divided into the heat dissipation chamber 131 and the sound box chamber 132 which are independent of each other, the air inlet 1121 and the air outlet 1122 are both communicated with the heat dissipation chamber 131, and the communication hole 1123 is communicated with the sound box chamber 132, so that the communication hole 1123 does not influence the cooling air flow entering and exiting the heat dissipation chamber 131, and the heat dissipation performance and the acoustic performance of the projection device are ensured not to interfere with each other.

In one embodiment, referring to fig. 2 and 4, the speaker 51 and the passive radiator 52 of the enclosure 50 are at least one, respectively, and the side wall of the housing 10 is provided with an acoustic outlet 128 opposite to the speaker 51. During projection, sound emitted by the speaker 51 can be transmitted through the sound outlet 128, so as to play the sound. For example, the sound box 50 includes two speakers 51 and two passive radiators 52, the two speakers 51 are respectively disposed at opposite ends of the sound box 50, and sound outlets 128 corresponding to the two speakers 51 are respectively disposed on opposite sidewalls of the housing 10. Two passive radiators 52 are respectively arranged on one side of the sound box 50 facing the top wall of the shell 10 and one side of the sound box facing the bottom wall of the shell 10, namely, the two passive radiators 52 are respectively arranged on the upper side and the lower side of the sound box 50. Through setting up two speakers 51 and two passive radiators 52 on audio amplifier 50, improve projection equipment's tone quality effect, promote user's experience. Further, the outer surfaces of the top wall and the side wall of the housing 10 are attached with decorative cloth layers through a wrapping process, and the cloth layers cover the sound outlet 128, so that the sound outlet 128 can be hidden, the housing 10 is attractive in appearance, and sound playing can be guaranteed.

In one embodiment, a light source 21 is connected to one side of the optical machine 20. The heat dissipation assembly further includes a first heat sink 40, where the first heat sink 40 is disposed on one side of the light source 21 and is thermally connected to the light source 21, and the fan 30 is used for driving the cooling air flow entering the heat dissipation cavity 131 from the air inlet 1121 to blow toward the first heat sink 40 and discharge from the air outlet 1122. During projection, the light source 21 generates heat and transfers the heat to the first heat sink 40. The fan 30 rotates to generate negative pressure, so that air enters the heat dissipation cavity 131 through the air inlet 1121, the air forms cooling air flow under the action of the fan 30, the cooling air flow flows through devices between the fan 30 and the air inlet 1121, heat on the devices between the fan 30 and the air inlet 1121 is taken away, the cooling air flow after heat exchange is blown to the first radiator 40, heat of the first radiator 40 is taken away, and the cooling air flow after heat exchange with the first radiator 40 is discharged from the air outlet 1122, so that heat dissipation of the projection equipment is realized.

In one embodiment, referring to fig. 1, 5 and 7, the housing 10 further includes a bottom wall, and the air inlet 1121, the air outlet 1122 and the communication hole 1123 are all provided in the bottom wall of the housing 10. Thus, after the projection device is placed on the desktop, the user cannot see the air inlet 1121, the air outlet 1122 and the communication hole 1123 of the bottom wall of the casing 10, the air inlet 1121, the air outlet 1122 and the communication hole 1123 are hidden, the consistency of the appearance of the casing 10 is ensured, and meanwhile, when the user approaches the projection device, the air flow flowing out from the air outlet 1122 cannot be directly blown to the user, so that the user experience can be improved.

Further, the housing 10 also includes a top wall disposed opposite the bottom wall. The bottom wall includes a flat portion 111 and an inclined portion 112, and the inclined portion 112 extends obliquely from the peripheral edge of the flat portion 111 toward the top wall, and the air inlet port 1121, the air outlet port 1122, and the communication hole 1123 are provided in the inclined portion 112. During projection, the projection device is placed on the desktop, and an interval is formed between the inclined part 112 and the desktop, so that the air inlet 1121, the air outlet 1122 and the communication hole 1123 can be prevented from being sealed by the desktop, the smoothness of air inlet and outlet is ensured, and meanwhile, the smoothness of air flowing inside and outside the sound box cavity 132 is also ensured.

In the present embodiment, referring to fig. 1 and 7, the inclined portion 112 is inclined outwardly from the peripheral edge of the planar portion 111 toward the top wall. It will be appreciated that the spacing between the opposite sides of the inclined portion 112 increases progressively from the planar portion 111 towards the top wall of the housing 10. Alternatively, the inclined portion 112 and the plane portion 111 form an angle γ therebetween, and γ is 20 ° or more and 30 ° or less

In one embodiment, referring to fig. 3, 5 and 6, the inclined portion 112 is provided with a communication area corresponding to the speaker chamber 132, and an air inlet area and an air outlet area corresponding to the heat dissipation chamber 131, and the air inlet area, the air outlet area and the communication area are disposed at intervals along the circumferential direction of the inclined portion 112. The air intake 1121 is provided in an air intake area, and the air intake area is disposed opposite to the optical engine 20. The air outlet 1122 is provided in an air outlet region, and the air outlet region is provided opposite to the first radiator 40. The communication hole 1123 is provided in the communication area, and the communication area is provided opposite to the sound box 50. In the projection process, the cooling air flow entering the heat dissipation cavity 131 through the air inlet 1121 flows through the optical machine 20 to take away heat of the optical machine 20, the cooling air flow after heat exchange with the optical machine 20 is blown to the first radiator 40 to take away heat of the first radiator 40, and the cooling air flow after heat exchange with the first radiator 40 is discharged from the air outlet 1122 to realize heat dissipation of the projection equipment. Along with the reciprocating motion of the vibrating basin of the sound box 50, air flows inside and outside the sound box cavity 132 through the communication hole 1123, so that pneumatic noise caused by air compression and expansion in the sound box cavity 132 is avoided, and the sound quality effect is improved.

In the present embodiment, referring to fig. 2, 5 and 6, the inclined portion 112 is provided with a plurality of bar-shaped holes that are arranged at intervals along the circumferential direction of the inclined portion 112. Specifically, the strip-shaped hole extends from a side of the inclined portion 112 near the planar portion 111 toward a side of the inclined portion 112 away from the planar portion 111. The bar-shaped hole facing the light machine 20 is an air inlet 1121, the bar-shaped hole facing the first radiator 40 is an air outlet 1122, and the bar-shaped hole facing the sound box 50 is a communication hole 1123. Wherein, the strip holes between the air inlet 1121 and the air outlet 1122, between the air outlet 1122 and the communication hole 1123, and between the communication hole 1123 and the air inlet 1121 are blind holes. So, can realize projection equipment's heat dissipation, can also avoid the pneumatic noise that the interior air compression expansion of audio amplifier chamber 132 causes simultaneously, promote tone quality effect. In addition, uniformity of the appearance of the housing 10 can be ensured. Of course, in other embodiments, the bar-shaped holes may be replaced with circular holes, square holes, and the like.

Further, referring to fig. 1 and 5, the projection apparatus further includes a base pad 19, and the base pad 19 is disposed on the plane portion 111. Alternatively, the base 19 has a height of 2mm to 5mm. In this way, the base 19 can serve to support the housing 10, increase the distance between the air inlet 1121, the air outlet 1122 and the table top, and reduce turbulence noise caused by the air flow flowing out through the air outlet 1122 and the table top impact.

Still further, referring to fig. 1 and 5, at least a portion of the air intake area and at least a portion of the air outlet area are located on opposite sides of the planar portion 111, respectively. The bottom pad 19 has an annular structure, and the bottom pad 19 is provided on the periphery of the planar portion 111 in the circumferential direction of the planar portion 111. The peripheral edge of the flat portion 111 refers to a connection position between the flat portion 111 and the inclined portion 112. By providing the bottom pad 19 having the annular structure around the periphery of the planar portion 111 in this manner, the bottom pad 19 can separate the air inlet port 1121 from the air outlet port 1122, and thus, the hot air discharged through the air outlet port 1122 is prevented from directly flowing back to the air inlet port 1121.

Optionally, the base pad 19 is a soft rubber pad. Of course, in other embodiments, the base pad 19 may be made of other materials, but not limited thereto.

In one embodiment, referring to fig. 2, 4 and 6, the inside of the case 10 is provided with a wind shielding part 113. The projection apparatus further includes a choke member 16, where the choke member 16 is disposed between the wind shielding portion 113 and the sound box 50, and abuts against the wind shielding portion 113 and the sound box 50, respectively, to divide the inner cavity 13 into a heat dissipation cavity 131 and a sound box cavity 132 independent of each other. In this way, the wind shielding part 113, the wind blocking member 16 and the sound box 50 cooperate to divide the inner cavity 13 into the heat dissipation chamber 131 and the sound box chamber 132 independent of each other, so that the communication hole 1123 does not affect the cooling air flow entering and exiting the heat dissipation chamber 131, and the heat dissipation performance and the acoustic performance of the projection apparatus are ensured not to interfere with each other.

Further, referring to fig. 2 and 6, the wind shielding portion 113 includes a first wind shielding rib 1131, and the first wind shielding rib 1131 extends from the inclined portion 112 at one side of the planar portion 111 to the inclined portion 112 at the other side of the planar portion 111 through the planar portion 111. Optionally, the first wind shielding rib 1131 is a rib. The sound box 50 is disposed between the first wind shielding rib 1131 and the top wall of the housing 10. In this way, the sound box 50 can be fitted to the bottom wall of the housing 10 having the flat portion 111 and the inclined portion 112. Of course, in other embodiments, the wind shielding portion 113 includes a partition plate provided in the inner cavity 13 for partitioning the inner cavity 13 into the heat dissipation chamber 131 and the sound box chamber 132 independent of each other; alternatively, a first partition is provided on the inner side of the bottom wall of the housing 10, a second partition is provided on the inner side of the top wall of the housing 10, and the first partition and the second partition are in butt-joint fit to partition the inner cavity 13 into a heat dissipation cavity 131 and a sound box cavity 132 which are independent from each other.

Further, referring to fig. 2 and 6, the choke 16 includes a first choke 161. The first choke 161 is disposed between the first wind shielding rib 1131 and the sound box 50, and two sides of the first choke 161 are respectively in butt fit with the first wind shielding rib 1131 and the sound box 50, so as to seal a gap between the sound box 50 and the first wind shielding rib 1131. When the first choke 161 is installed, the first wind shielding rib 1131 can be installed first, and then the sound box 50 is placed on the first choke 161, so that a gap between the first wind shielding rib 1131 and the sound box 50 can be accurately sealed. In this way, the first choke 161 is used to seal the gap between the first wind shielding rib 1131 and the sound box 50, so that the heat dissipation cavity 131 and the sound box cavity 132 are independent from each other, and the heat dissipation performance and the acoustic performance of the projection device are effectively ensured not to interfere with each other.

Optionally, the first choke 161 is foam. Of course, in other embodiments, the first choke member 161 may be made of other sealing materials, but not limited thereto.

In one embodiment, referring to fig. 2, 4 and 6, the wind shielding part 113 further includes a second wind shielding bead 1132, a third wind shielding bead 1133, a fourth wind shielding bead 121 and a fifth wind shielding bead 122. The second wind shielding rib 1132 and the third wind shielding rib 1133 are both disposed on the inclined portion 112, and are disposed on two sides of the planar portion 111 respectively. The inner side of the top wall of the shell 10 is correspondingly provided with a fourth wind shielding convex rib 121 and a fifth wind shielding convex rib 122, the second wind shielding convex rib 1132 is in butt joint with the fourth wind shielding convex rib 121, and the third wind shielding convex rib 1133 is in butt joint with the fifth wind shielding convex rib 122. Optionally, the second wind shielding bead 1132, the third wind shielding bead 1133, the fourth wind shielding bead 121 and the fifth wind shielding bead 122 are all bead sheets. The side of the sound box 50 facing the optical machine 20 is in abutting fit with the second wind shielding convex rib 1132, the third wind shielding convex rib 1133, the fourth wind shielding convex rib 121 and the fifth wind shielding convex rib 122. Specifically, the side of the sound box 50 facing the optical machine 20 is directly or indirectly abutted against the second wind shielding rib 1132, the third wind shielding rib 1133, the fourth wind shielding rib 121 and the fifth wind shielding rib 122. In this way, the speaker box 50, the first wind shielding rib 1131, the second wind shielding rib 1132, the third wind shielding rib 1133, the fourth wind shielding rib 121 and the fifth wind shielding rib 122 cooperate to divide the inner cavity 13 into the heat dissipation cavity 131 and the speaker box 50 which are independent from each other. In addition, the side of the sound box 50 facing the optical machine 20 can be abutted against the second wind shielding rib 1132, the third wind shielding rib 1133, the fourth wind shielding rib 121 and the fifth wind shielding rib 122, so that stable installation of the sound box 50 is realized.

It will be appreciated that the abutting engagement of the second wind shielding bead 1132 and the fourth wind shielding bead 121 means that the side of the second wind shielding bead 1132 away from the bottom wall of the housing 10 and the side of the fourth wind shielding bead 121 away from the top wall of the housing 10 are in abutting engagement, and the abutting engagement of the third wind shielding bead 1133 and the fifth wind shielding bead 122 means that the side of the third wind shielding bead 1133 away from the bottom wall of the housing 10 and the side of the fifth wind shielding bead 122 away from the top wall of the housing 10 are in abutting engagement.

Further, referring to fig. 6, the first wind shielding rib 1131 includes a first rib section 11311, a second rib section 11312 and a third rib section 11313. Specifically, the height of the first rib section 11311 is greater than the height of the second rib section 11312 and the third rib section 11313. The first rib section 11311 is disposed on the planar portion 111 and extends from one side of the planar portion 111 to the other side. The second rib section 11312 and the third rib section 11313 are both disposed at the inclined portion 112, and are respectively disposed at two ends of the first rib section 11311. Two ends of the second rib section 11312 are respectively connected with the first rib section 11311 and the second wind shielding rib 1132, and two ends of the third rib section 11313 are respectively connected with the first rib section 11311 and the third wind shielding rib 1133. In this way, the enclosure 50 is better able to adapt to the bottom wall with the planar portion 111 and the inclined portion 112, and cooperates with the first windscreen rib 1131 to divide the internal cavity 13 of the casing 10 into the heat dissipation chamber 131 and the enclosure chamber 132 independent from each other. In addition, the structural strength of the housing 10 can be increased.

Further, referring to fig. 2, 4 and 6, the choke 16 further includes a second choke 162, where the second choke 162 is disposed between the second wind shielding rib 1132 and the fourth wind shielding rib 121 on the side of the speaker box 50 facing the light machine 20. Specifically, one side of the second choke 162 is in abutting fit with one side of the sound box 50 facing the optical machine 20, and the other side is in abutting fit with the second wind shielding rib 1132 and the fourth wind shielding rib 121, so as to seal gaps between the side of the sound box 50 facing the optical machine 20 and the second wind shielding rib 1132 and the fourth wind shielding rib 121. The choke 16 further includes a third choke 163, where the third choke 163 is disposed between the third weather bead 1133 and the fifth weather bead 122 and a side of the speaker 50 facing the optical engine 20. Specifically, one side of the third choke 163 is in abutting fit with one side of the sound box 50 facing the optical machine 20, and the other side is in abutting fit with the third wind shielding rib 1133 and the fifth wind shielding rib 122, so as to seal gaps between the side of the sound box 50 facing the optical machine 20 and the third wind shielding rib 1133 and the fifth wind shielding rib 122. In this way, the second choke member 162 can effectively seal the gap between the side of the sound box 50 facing the optical machine 20 and the second wind shielding rib 1132 and the fourth wind shielding rib 121, and the third choke member 163 can effectively seal the gap between the side of the sound box 50 facing the optical machine 20 and the third wind shielding rib 1133 and the fifth wind shielding rib 122, so that the heat dissipation cavity 131 and the sound box cavity 132 are ensured to be independent from each other, and the heat dissipation performance and the acoustic performance of the projection device are ensured not to interfere with each other.

Alternatively, the second and third choke 162, 163 may be foam. Of course, in other embodiments, the second choke 162 and the third choke 163 may be other sealing materials, not limited thereto.

In one embodiment, referring to fig. 2 and 7, a first space 14 is provided between the bottom side of the light engine 20 and the bottom wall of the housing 10, and the first space 14 communicates with the air inlet 1121. The projection device further comprises a circuit board 60, wherein the circuit board 60 is arranged on the top side of the optical machine 20, a second interval 15 is arranged between the circuit board 60 and the optical machine 20, and the second interval 15 is communicated with the air inlet 1121. The fan 30 is provided with a first air outlet 31, a first air inlet 32 facing the bottom wall of the shell 10 and a second air inlet 33 facing the top wall of the shell 10, wherein the first air inlet 32 is communicated with the first space 14, and the second air inlet 33 is communicated with the second space 15. The first air outlet 31 is opposite to the first radiator 40, and the fan 30 is used for driving the cooling air flow entering the housing 10 from the air inlet 1121 to blow toward the first radiator 40 through the first space 14 and the second space 15 and discharge from the air outlet 1122. In the projection process, the cooling air flows through the first space 14 and the second space 15 under the action of the fan 30, and correspondingly takes away the heat of the bottom side of the optical engine 20, the top side of the optical engine 20 and the circuit board 60. Then, the cooling air flow after heat exchange with the optical machine 20 flows out from the first space 14 and the second space 15 and blows to the first radiator 40 to take away the heat of the first radiator 40, so as to realize heat dissipation of the light source 21. Finally, the cooling air flow having exchanged heat with the first radiator 40 is discharged from the air outlet 1122. In this way, the cooling air flow entering the housing 10 can flow through the first space 14 between the bottom side of the optical engine 20 and the housing 10 and the second space 15 between the top side of the optical engine 20 and the circuit board 60 at the same time, so that the effective heat dissipation area of the surface of the optical engine 20 can be increased, the temperature of the surface of the optical engine 20 can be reduced, and the light emitting performance of the optical devices in the optical engine 20 can be ensured.

Further, referring to fig. 2, 8 and 9, the first radiator 40 has an air inlet end 42 and an air outlet end 41. The first radiator 40 includes a plurality of first heat dissipation fins 43 disposed at intervals, and the plurality of first heat dissipation fins 43 are arranged in a fan shape between the air inlet end 42 and the air outlet end 41. A first airflow channel is formed between two adjacent first heat dissipation fins 43, the first airflow channel has a third air inlet 421 located at the air inlet end 42 and a second air outlet 411 located at the air outlet end 41, the second air outlet 411 is opposite to and communicated with the air outlet 1122, and the third air inlet 421 is opposite to and communicated with the first air outlet 31. In the projection process, under the action of the fan 30, the cooling air flows flowing through the first space 14 and the second space 15 enter the first air flow channel from the third air inlet 421 and exchange heat with the first heat dissipation fins 43, and the cooling air flows after heat exchange are discharged out of the shell 10 from the second air outlet 411 and the air outlet 1122, so that heat dissipation of the light source 21 is realized.

Specifically, referring to fig. 8 and 9, the width of the second air outlet 411 gradually increases from the air inlet end 42 to the air outlet end 41. In this way, the first heat dissipating fins 43 are arranged in a fan shape, so that the cooling air flow is more dispersed in the first air flow channel to take away more heat of the first heat sink 40, and the heat dissipating effect of the first heat sink 40 is improved.

Alternatively, referring to fig. 8, the plurality of first heat radiating fins 43 are identical in shape and size. In this way, since the plurality of first heat radiating fins 43 are identical in shape and size, it is possible to control the mold opening cost and to ensure the workability of the first heat sink 40.

Further, the air inlet direction and the air outlet direction of the first air flow channel are arranged at an obtuse angle. Therefore, the air outlet direction of the cooling air flow can be changed, and meanwhile, the smoothness of the cooling air flow flowing in the first air flow channel is ensured.

In one embodiment, referring to fig. 7 and 9, the first heat dissipation fin 43 includes a first side 431 and a second side 432 disposed opposite to each other. Specifically, the length of the first side 431 is greater than the length of the second side 432, and the first side 431 is bent or curved toward the bottom wall of the housing 10. Edges of the first side 431 and the second side 432 are provided with folds so that a first air flow channel is formed between two adjacent first heat dissipation fins 43. In this way, two adjacent first heat dissipation fins 43 can be enclosed to form a first air flow channel, and the first air flow channel is bent or curved towards the bottom wall of the housing 10, so that the third air inlet 421 of the first air flow is opposite to the air outlet 1122.

Referring to fig. 7 and 9, since the edges of the first side 431 and the second side 432 are provided with the folded edges, the adjacent two first heat dissipation fins 43 and the folded edges are surrounded to form the first airflow channel, so that a small gap exists between the adjacent two first heat dissipation fins 43, the first air outlet 31 of the fan 30 is used as a high-speed communication area, heat leakage occurs, airflow backflow is caused, and the fresh air quantity of the third air inlet 421 is reduced. Therefore, in the present embodiment, the projection apparatus further includes a sealing layer 45, where the sealing layer 45 is disposed on the first side 431 and is connected to the first side 431 in a sealing manner. Thus, the first radiator 40 can be prevented from leaking out, the air quantity entering the first air flow channel is ensured, and the heat dissipation efficiency is improved.

Optionally, the sealing layer 45 is an adhesive sealing layer, and the adhesive sealing layer 45 is adhered to the first side 431.

In one embodiment, referring to fig. 9, the area of the second air outlet 411 is larger than the area of the third air inlet 421. In this way, the flow velocity of the cooling air flow at the second air outlet 411 can be reduced, the wind noise generated can be reduced, and the noise can be reduced.

Referring to fig. 7 and 9, for the fan-shaped first radiator 40, since the width of the second air outlet 411 gradually increases from the air inlet end 42 to the air outlet end 41, a speed-reducing and pressurizing area is formed in the first air flow channel, if the area difference between the third air inlet 421 and the second air outlet 411 is too large, the cooling air flow will be affected by the inverse pressure gradient, so that the cooling air flow does not flow smoothly in the first air flow channel, and the heat dissipation performance of the first radiator 40 is further reduced. Therefore, the angle between the second side face 432 and the inclined portion 112 is σ ₁ Wherein 110 DEG is less than or equal to sigma ₁ Not more than 140 degrees; the first side 431 has an angle sigma between the end connected to the air outlet end 41 and the inclined portion 112 ₂ Wherein, 90 degrees is less than or equal to sigma ₂ Not more than 120 degrees. In this way, the heat radiation performance of the first radiator 40 can be enhanced, the turbulence noise of the air outlet 1122 can be reduced, and the height of the projection apparatus can be reduced.

In one embodiment, the projection device further comprises a seal by which the periphery of the air outlet end 41 is sealingly connected to the bottom wall of the housing 10. Therefore, the hot air can be prevented from flowing back, and the heat dissipation effect is ensured.

Optionally, the seal is foam. Of course, in other embodiments, the sealing member may be other sealing materials, which is not limited thereto.

In one embodiment, referring to FIG. 3, the fan angle of the first heat sink 40 is α,125 α.ltoreq.α.ltoreq.150 °. Through the fan-shaped angle of rationally setting up first radiator 40, avoid the fan-shaped angle of first radiator 40 too little and unable make full use of the cooling air current that fan 30 blown out, lead to radiating inefficiency, also avoid simultaneously the fan-shaped angle of first radiator 40 too big, the cooling air current that fan 30 blown out can't flow through every first radiating fin 43, lead to invalid setting up partial first radiating fin 43 and cause the increase of volume and cost.

In one embodiment, referring to fig. 8 and 9, the first heat sink 40 further includes a flow equalization member 46, where the flow equalization member 46 is provided with a first air port 461, a second air port 462, and a flow equalization channel 463 communicating the first air port 461 with the second air port 462, the first air port 461 is communicated with the third air port 421, and the second air port 462 is communicated with the first air outlet 31. In the projection process, the cooling air flows out from the first air outlet 31 under the action of the fan 30, and flows into the first air flow channel of the first radiator 40 through the flow equalizing channel 463. In this way, by arranging the flow equalization member 46, the flow equalization member 46 can effectively and uniformly blow out the cooling air flow from the first air outlet 31 of the fan 30, thereby improving the uniformity of the cooling air flow entering the first air flow channel and enhancing the heat dissipation performance of the first radiator 40.

Further, referring to fig. 8 and 9, the end of the flow equalizer 46 provided with the first air port 461 is in sealing connection with the air inlet end 42 of the first heat sink 40, and the end of the flow equalizer 46 provided with the second air port 462 is in sealing connection with the end of the fan 30 provided with the first air outlet 31. In this way, the ends of the flow equalization member 46 provided with the first air port 461 and the second air port 462 are respectively connected with the first radiator 40 and the fan 30 in a sealing manner, so that the air leakage of the flow equalization member 46 can be prevented from affecting the air volume of the cooling air flow.

Optionally, the sealing connection means includes, but is not limited to, tape sealing, tight abutment sealing, sealing with a sealing strip, etc.

Further, referring to fig. 7 and 9, the projection apparatus further includes a heat insulating layer 44, and the heat insulating layer 44 is hermetically connected to a side of the first heat sink 40 facing the circuit board 60. Specifically, the heat insulating layer 44 is disposed on a side of the first heat dissipation fins 43 and/or the flow equalization member 46 facing the circuit board 60. In this way, the thermal insulation layer 44 can function as a thermal current blocking layer, and prevent the thermal current from rising toward the circuit board 60 to contact the circuit board 60, thereby causing the temperature of the circuit board 60 to be too high.

Optionally, the insulating layer 44 is an insulating adhesive layer, and the insulating adhesive layer is adhered to a side of the first radiator 40 facing the circuit board 60, so as to realize a sealing connection between the insulating adhesive layer and the side of the first radiator 40 facing the circuit board 60.

In one embodiment, referring to fig. 2 and 3, the housing 10 includes a first side wall 124, a second side wall 125, a third side wall 126, and a fourth side wall 127 extending from the top wall toward the bottom wall. The first side wall 124 and the second side wall 125 are oppositely arranged, the third side wall 126 and the fourth side wall 127 are oppositely arranged between the first side wall 124 and the second side wall 125, and two sides of the third side wall 126 and the fourth side wall 127 are respectively and correspondingly connected with the first side wall 124 and the second side wall 125. The light machine 20 is arranged close to the first side wall 124, the fan 30 is arranged between the light machine 20 and the second side wall 125, one end of the fan 30 provided with the first air outlet 31 faces to the connection position of the second side wall 125 and the third side wall 126, and a preset included angle theta is formed between the perpendicular line of the plane where the first air outlet 31 is arranged and the third side wall 126, and the included angle theta is more than or equal to 35 degrees and less than or equal to 55 degrees. In this way, the fan 30 is obliquely arranged, the fan 30, the first side wall 124 and the second side wall 125 are arranged between the fan 40 and the first radiator 40, so that the size of the fan in the horizontal direction and the size of the fan in the vertical direction can be reduced, the area of the first radiator 40 can be increased in the same space, the radiating efficiency is improved, the inner cavity 13 of the shell 10 can be fully utilized, and the size of the projection device can be reduced. In addition, the first air inlet 32 and the second air inlet 33 of the blower 30 are located as close to the optical engine 20 as possible relative to the first air outlet 31, so that the cooling air flows through a shorter flow path and is sucked into the first air inlet 32 and the second air inlet 33 of the blower 30, and the resistance of the cooling air flow can be reduced.

In one embodiment, referring to fig. 2 and 3, a projection lens 22 is coupled to the front side of the light engine 20. It should be noted that the front side of the light machine 20 refers to the side of the light machine 20 facing the third sidewall 126. Specifically, the projection lens 22 and the light source 21 are disposed side by side and are both located on the same side of the light engine 20. The optical machine 20 is internally provided with an optical modulator, one side of the optical machine 20, which is away from the projection lens 22, is provided with a second radiator 70, and the second radiator 70 is in heat conduction connection with the optical modulator. The second radiator 70 is opposite to the air inlet 1121, and the fan 30 is further configured to drive the cooling air flowing into the housing 10 from the air inlet 1121 to flow through the second radiator 70. During projection, the light modulator also generates heat and transfers the heat to the second heat sink 70. The fan 30 rotates to generate negative pressure, so that air enters the shell 10 through the air inlet 1121, and the air forms cooling air flow under the action of the fan 30, and the cooling air flow takes away heat on the surface of the second radiator 70, so that heat dissipation of the light modulator is realized.

Specifically, the second heat sink 70 includes a plurality of second heat dissipation fins disposed at intervals, the plurality of second heat dissipation fins being disposed at intervals along the direction from the top wall to the bottom wall of the housing 10, and a second air flow channel being formed between two adjacent second heat dissipation fins.

In one embodiment, referring to fig. 7, the side of the circuit board 60 facing the optical engine 20 is provided with electronic components. The projection device further includes a third heat sink 80, where the third heat sink 80 is disposed in the second space 15 and is thermally connected to the electronic component. In the projection process, the fan 30 drives the cooling air flow entering the housing 10 from the air inlet 1121 to flow through the second space 15 between the circuit board 60 and the top side of the optical engine 20, the cooling air flow exchanges heat with the top side of the optical engine 20, and then the cooling air flow after heat exchange flows through the third radiator 80, so that heat of the third radiator 80 is taken away, and the temperature of the electronic component is reduced.

Further, the third heat sink 80 is thermally coupled to the electronic components on the circuit board 60 via a thermally conductive interface material. In this way, the thermal interface material can fill the micro-voids and the uneven surface generated when the third heat sink 80 contacts with the electronic component on the circuit board 60, reduce thermal resistance, and improve heat dissipation performance of the electronic component.

Referring to fig. 7, since the first heat sink 40 dissipates heat from the light source 21, the surface of the first heat sink 40 has a high temperature, which heats the electronic components on the circuit board 60. For electronic components with larger heat consumption on the circuit board 60, the gap between the circuit board 60 and the top wall of the housing 10 is smaller, and the heat is accumulated in a small space to heat the housing 10, so that the top wall of the housing 10 has local hot spots due to low heat conductivity of the plastic housing 10, thereby affecting the user experience. Therefore, in the present embodiment, the projection apparatus further includes a temperature equalizing layer 123, and the temperature equalizing layer 123 covers the inner side of the top wall of the housing 10. Thus, by laying the temperature equalizing layer 123 on the inner side of the top wall of the shell 10, the local hot spot temperature of the top wall of the shell 10 is reduced, and the user experience is improved.

Optionally, the temperature equalizing layer 123 is copper foil, aluminum foil, artificial graphene, or the like. Of course, in other embodiments, the temperature equalizing layer 123 can be another material layer, which is not limited thereto.

In the description of the present invention, 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 invention 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 invention.

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 invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, 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 invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, 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.

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 invention, which are described in detail and are not to be construed as limiting the scope of the invention. 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 invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The projection equipment is characterized by comprising a shell, a sound box, an optical machine and a heat dissipation assembly:

2. The projection apparatus according to claim 1, wherein the housing further comprises a bottom wall and a top wall provided opposite to the bottom wall, the bottom wall of the housing comprises a flat portion and an inclined portion extending obliquely from a periphery of the flat portion toward the top wall of the housing, and the air inlet, the air outlet, and the communication hole are all provided in the inclined portion.

3. The projection apparatus according to claim 2, wherein a wind shielding part is provided on an inner side of the housing, the projection apparatus further comprising a choke member provided between the wind shielding part and the sound box and respectively abutting against the wind shielding part and the sound box to separate an inner cavity of the housing into the heat dissipation chamber and the sound box chamber independent of each other.

4. A projection apparatus according to claim 3 wherein the wind shielding portion comprises a first wind shielding rib extending from the inclined portion on one side of the planar portion to the inclined portion on the other side of the planar portion via the planar portion, the sound box being provided between the first wind shielding rib and a top wall of the housing.

5. The projection device of claim 4, wherein the choke member further comprises a first choke member disposed between the first weather bead and the sound box, both sides of the first choke member being respectively in abutting engagement with the first weather bead and the sound box.

6. The projection device of claim 3, wherein the wind shielding portion further includes a second wind shielding rib, a third wind shielding rib, a fourth wind shielding rib and a fifth wind shielding rib, the second wind shielding rib and the third wind shielding rib are both disposed on the inclined portion and are disposed on opposite sides of the planar portion, the fourth wind shielding rib and the fifth wind shielding rib are correspondingly disposed on an inner side of the top wall of the housing, the second wind shielding rib and the fourth wind shielding rib are in butt joint, the third wind shielding rib and the fifth wind shielding rib are in butt joint, and a side of the sound box facing the optical machine is in butt joint with the second wind shielding rib, the third wind shielding rib, the fourth wind shielding rib and the fifth wind shielding rib.

7. The projection device of claim 6, wherein the choke member further comprises a second choke member and a third choke member, the second choke member is disposed between a side of the sound box facing the light machine and the second wind shielding rib and the fourth wind shielding rib, the side of the second choke member and the side of the sound box facing the light machine are in abutting fit, and the other side of the second choke member is in abutting fit with the second wind shielding rib and the fourth wind shielding rib; the third choke piece is arranged between one side of the sound box, which faces the optical machine, and the third wind shielding convex rib and the fifth wind shielding convex rib, one side of the third choke piece is in butt fit with one side of the sound box, which faces the optical machine, and the other side of the third choke piece is in butt fit with the third wind shielding convex rib and the fifth wind shielding convex rib respectively.

8. The projection device of claim 2, wherein a light source is connected to one side of the light engine, the heat dissipating assembly further comprises a first heat sink disposed on one side of the light source and thermally coupled to the light source, and the fan is configured to drive a cooling air flow entering the heat dissipating cavity from the air inlet to blow against the first heat sink and to be discharged from the air outlet.

9. The projection device of claim 8, wherein the inclined portion is provided with a communication area corresponding to the sound box cavity, an air inlet area and an air outlet area corresponding to the heat dissipation cavity, the air inlet area, the air outlet area and the communication area are arranged along the circumferential direction of the inclined portion at intervals, the air inlet hole is formed in the air inlet area, the air inlet area and the optical machine are oppositely arranged, the air outlet hole is formed in the air outlet area, the air outlet area and the first radiator are oppositely arranged, the first radiator is provided with a second air outlet, the second air outlet and the air outlet hole are opposite and are communicated, the communication hole is formed in the communication area, and the communication area and the sound box are oppositely arranged.

10. The projection device of claim 9, further comprising a base pad disposed on the planar portion;

at least part of the air inlet area and at least part of the air outlet area are respectively positioned at two opposite sides of the plane part, the bottom pad is of an annular structure, and the bottom pad is arranged at the periphery of the plane part along the circumferential direction of the plane part.

11. The projection apparatus according to claim 8, wherein the inclined portion is provided with a plurality of strip-shaped holes, each of which extends from a side of the inclined portion near the planar portion toward a side of the inclined portion remote from the planar portion, and is disposed at intervals along a circumferential direction of the inclined portion; the strip-shaped hole opposite to the optical machine is the air inlet hole, the strip-shaped hole opposite to the second air outlet of the first radiator is the air outlet hole, and the strip-shaped hole opposite to the sound box is the communication hole; the strip-shaped holes are blind holes among the air inlet holes, the air outlet holes, the communication holes and the air inlet holes.