CN110687738A - Projector - Google Patents

Abstract

The application discloses a projector, which comprises a shell, a heat dissipation device and an air guide assembly, wherein the heat dissipation device and the air guide assembly are arranged in the shell; the air guide assembly comprises a body and a guide plate, the body is provided with a cover plate and a connecting plate which are adjacently arranged, an air flow channel is formed between the fan and the radiator by the cover plate and the connecting plate, the guide plate is sleeved on the body, and the guide plate is used for changing the direction of the fan air flow so that the fan air flow flows to the radiator along the guide plate. The fan is arranged at a position far away from the ventilation opening, so that the noise generated when the projector works is reduced, in addition, the air guide assembly is arranged between the fan and the radiator, so that the air blown out by the fan flows along the air guide assembly, and the noise generated by collision and friction of the air flow and electronic devices in the shell when the air flow flows in the shell is avoided.

Description

Projector

Technical Field

The application relates to the field of optical instruments, in particular to a projector.

Background

With the popularization of the projector application, the performance requirements of users on the projector are improved, optical components in the projector are easily damaged by heat, a plurality of fans are often arranged in the prior art to improve the heat dissipation efficiency, but when the fans run at high speed, larger noise is often generated, and the user experience is affected.

Disclosure of Invention

The application provides a projector capable of reducing fan noise.

The application provides a projector, which comprises a shell, a heat dissipation device and an air guide assembly, wherein the heat dissipation device and the air guide assembly are arranged in the shell; the air guide assembly comprises a body and a guide plate, the body is provided with a cover plate and a connecting plate which are adjacently arranged, the cover plate and the connecting plate form a channel between the fan and the radiator, airflow blown out by the fan flows to the radiator through the channel, the guide plate is sleeved on the body, and the guide plate is used for changing the direction of the airflow of the fan, so that the airflow flows to the radiator along the guide plate.

The body is provided with a silencing hole, and the silencing hole is used for increasing airflow resistance when the airflow passes through the body so as to absorb sound inside the body.

The radiator comprises a base plate and radiating fins, wherein the base plate comprises a first base plate and a second base plate, the first base plate is located above the second base plate, and the radiating fins are clamped between the first base plate and the second base plate.

The radiating fins comprise first radiating fins and second radiating fins, and the first radiating fins and the second radiating fins are arranged at intervals to form first air guide grooves with openings facing the first substrate and second air guide grooves with openings facing the second substrate.

The air deflector comprises a windward surface and an air outlet surface which are oppositely arranged, the windward surface is aligned with the fan, the air outlet surface is aligned with the radiator, and fan airflow enters the body along the windward surface and flows out of the radiator along the air outlet surface.

The projector further comprises a rotating mechanism, wherein the rotating mechanism is sleeved on the air guide assembly to control the air guide assembly to rotate, so that the air flow direction of the fan is changed.

The rotating mechanism comprises a gear, a rack meshed with the gear and a motor, the motor drives the rack to do linear motion, the gear is sleeved on the air guide assembly, and the gear drives the air guide assembly to rotate when rotating on the rack.

The projector further comprises an air speed sensor and a controller, the air speed sensor is used for monitoring the air flow speed flowing through the guide plate, the air speed sensor receives an air speed change signal and feeds the air speed change signal back to the controller, and the controller adjusts the steering of the rotating mechanism according to the air speed change signal.

The projector further comprises a heat pipe, one end of the heat pipe is connected with the radiator, and the other end of the heat pipe is connected with a heat source in the shell.

The projector further comprises a dust baffle plate, and the dust baffle plate is clamped between the radiator and the ventilation opening.

The projector that this application embodiment provided is through setting up the fan in the position of keeping away from the vent for the noise reduction of projector during operation. In addition, the air guide assembly is arranged between the fan and the radiator, so that air blown out by the fan flows along the air guide assembly, and noise generated by collision and friction of air flow with electronic devices in the shell when the air flow flows in the shell is avoided.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic view of a projector according to an embodiment of the present disclosure;

fig. 2 is a schematic view of a housing in the projector shown in fig. 1;

FIG. 3 is a schematic view of a heat sink in the projector shown in FIG. 1;

FIG. 4 is a schematic view of a heat sink of the heat dissipation device of FIG. 3;

FIG. 5 is a schematic view of a substrate in the heat sink of FIG. 4;

FIG. 6 is a schematic view of a heat sink fin of the heat sink of FIG. 4;

fig. 7 is a schematic view of a wind guide assembly in the projector shown in fig. 1;

fig. 8 is a schematic view of the main body of the wind guide assembly shown in fig. 7;

FIG. 9 is a schematic view of the body of FIG. 8 with muffling holes;

fig. 10 is a schematic view of a baffle of the air deflection assembly shown in fig. 7;

fig. 11 is a schematic view of a rotating mechanism in the projector shown in fig. 1;

FIG. 12 is a schematic view of the projector of FIG. 1 with heat pipes on the heat sink;

fig. 13 is a schematic view of the projector shown in fig. 1 provided with a dust guard;

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, a projector 100, also called a projector, which is a device capable of projecting images or videos onto a curtain and connected to a computer, a VCD, a DVD, a BD, a game console, a DV, or the like through different interfaces to play corresponding video signals is shown in this embodiment. The working principle is that the photoelectric effect of liquid crystal is utilized to generate images with different gray levels and colors. The universal three-plate liquid crystal board projector has one optical system to separate the strong light into R, G, B three beams of light separately through R, G, B three-color liquid crystal board, AD converted signal, modulated signal and applied to the liquid crystal board, and through controlling the opening and closing of the liquid crystal unit, the light path is controlled to be switched on and off, R, G, B light is finally converged in the prism and projected by the projecting lens onto the screen to form color image.

As shown in fig. 1, the projector 100 includes a housing 1, and a heat dissipation device 2 and an air guiding assembly 3 disposed in the housing 1, wherein the heat dissipation device 2 includes a heat sink 22 and a fan 21, a vent 1211 is disposed on the housing 1, and the fan 21 is disposed on a side of the housing 1 away from the vent 1211; the air guiding assembly 3 includes a body 31 and a flow guiding plate 32, the body 31 has a cover plate 311 and a connecting plate 312 which are adjacently disposed, the cover plate 311 and the connecting plate 312 form an air flow channel between the fan 21 and the heat sink 22, the flow guiding plate 32 is sleeved on the body 31, and the flow guiding plate 32 is used for changing the air flow direction of the fan 21, so that the air flow flows along the flow guiding plate 32.

The fan 21 is disposed at a position away from the air vent 1211, so that noise generated when the projector 100 operates is reduced, and the air guide assembly 3 is disposed between the fan 21 and the radiator 22, so that air blown from the fan 21 flows along the air guide assembly 3, thereby preventing noise generated by collision or friction with electronic components in the housing 1 when air flows inside the housing 1.

Alternatively, as shown in fig. 2, the housing 1 includes an upper housing 11 and a lower housing 12, the upper housing 11 and the lower housing 12 are connected to form a receiving area, i.e. the inside of the housing 1, and the lower housing 12 is provided with an air vent 1211.

By providing the ventilation opening 1211 in the lower case 12, it is possible to prevent the disadvantage that dust is easily attached when the ventilation opening 1211 faces upward.

In one embodiment, as shown in fig. 2, the upper housing 11 is substantially rectangular, the lower housing 12 includes a bottom plate 122 and a supporting plate 121 integrally disposed, and the upper housing 11 is detachably fixed to the supporting plate 121 of the lower housing 12 by screws or the like. The supporting plate 121 is provided with a vent 1211, the vent 1211 is a plurality of rectangular through holes formed in the supporting plate 121, and the vent 1211 is used for exchanging air inside and outside the housing 1.

Optionally, referring to fig. 1 and fig. 3, a heat dissipation device 2 is disposed inside the housing 1, and the heat dissipation device 2 is used for cooling the inside of the housing 1, so as to ensure reliability of the optical device and the electronic device inside the housing 1. Specifically, the heat dissipation device 2 includes a heat sink 22 and a fan 21, the heat sink 22 is aligned with the ventilation opening 1211 on the housing 1, and the fan 21 is located at a side of the housing 1 far from the ventilation opening 1211, it can be understood that the air flow blown by the fan 21 passes through the heat sink 22 to carry away the heat on the air flow and is dissipated to the outside of the housing 1 through the ventilation opening 1211.

By disposing the heat sink 22 between the fan 21 and the ventilation 1211, the heat source inside the casing 1 is conducted to the heat sink 22, and the fan 21 blows air towards the heat sink 22, thereby preventing the air flow from flowing inside the casing 1 and generating loud noise when the fan 21 blows air directly towards the inside of the casing 1.

In one embodiment, as shown in fig. 3, the heat sink 22 is detachably fixed on the bottom plate 122 and close to the ventilation opening 1211, the fan 21 is fixed on a side of the heat sink 22 away from the ventilation opening 1211, the fan 21 is detachably fixed on the bottom plate 122 by bolts or the like, the fan 21 has an air outlet 211, the air outlet 211 is aligned with the heat sink 22, and the airflow blown by the fan 21 flows to the ventilation opening 1211 after passing through the heat sink 22.

Optionally, referring to fig. 1 and fig. 4, the heat sink 22 includes a base plate 221 and a plurality of heat dissipation fins 222 disposed on the base plate 221, specifically, the base plate 221 includes a first base plate 2211 and a second base plate 2212, the first base plate 2211 is disposed above the second base plate 2212, the heat dissipation fins 222 are disposed between the first base plate 2211 and the second base plate 2212, the first base plate 2211 is used for fixing the heat sink 22 on the upper housing 11, the second base plate 2212 is used for fixing the heat sink 22 on the bottom plate 122, a plurality of channels allowing a fluid to pass through are disposed on the heat dissipation fins 222, the channels include a channel inlet and a channel outlet which are disposed oppositely, the channel inlet faces the fan 21, the channel outlet faces the vent 1211 on the housing 1, it can be understood that an airflow of the fan 21 flows into the heat sink 22 through the channel inlet of the heat dissipation fins 222, flows out through the channel outlet to the vent 1211.

By providing a plurality of airflow channels on the heat sink 22, the airflow can flow inside the channels, and thus, the generation of loud noise when the high-speed airflow directly blows on the heat sink 22 is avoided.

Optionally, as shown in fig. 1 and fig. 5, the first substrate 2211 is substantially a rectangular flat plate, circular through holes 2211c are disposed at four edges of the first substrate 2211, threaded holes are disposed at opposite positions of the upper housing 11, the first substrate 2211 has an upper end surface 2211a and a lower end surface 2211b which are disposed opposite to each other, the upper end surface 2211a faces the upper housing 11, the screws penetrate through the through holes 2211c of the lower end surface 2211b, penetrate through the through holes 2211c of the upper end surface 2211a and then are matched with the threaded holes on the upper housing 11, and the heat sink 22 is connected to the upper housing 11, in this connection manner, the heat sink 22 is detachably connected to the housing 1, so that the heat sink 22 is conveniently detached from the housing 1 to clean dust inside the housing. The second substrate 2212 is fixed on the bottom plate 122 in the same manner as the first substrate 2211, and is not described herein again. Of course, in other embodiments, the base plate 221 may be fixed to the housing 1 by means of a tenon, a bolt, a latch, a welding, or the like.

Optionally, as shown in fig. 6, the heat dissipation fins 222 are preferably aluminum plates, which have better heat dissipation performance, but in other embodiments, the heat dissipation fins 222 may also be made of other materials, for example, the heat dissipation fins 222 may be copper plates, steel plates, and the like.

Optionally, as shown in fig. 1 and fig. 6, the heat dissipation fins 222 include a plurality of first heat dissipation fins 2221 and a plurality of second heat dissipation fins 2222, where the first heat dissipation fins 2221 refer to a convex portion on the heat dissipation fins 222, the second heat dissipation fins 2222 refer to a concave portion on the heat dissipation fins 222, the first heat dissipation fins 2221 and the second heat dissipation fins 2222 are arranged at intervals to form a first air guiding groove 2231 facing the first substrate 2211 and a second air guiding groove 2232 facing the second substrate 2212, and when the air flow of the fan 21 flows into the heat sink 22, the air flow respectively enters the adjacent air guiding grooves 223 and flows to the vent 1211 through the air guiding grooves 223.

By setting the first heat dissipating fins 2221 to be convex upward and the second heat dissipating fins 2222 to be concave downward, the area of the heat dissipating fins 222 can be increased, so that more heat is taken away by the airflow passing through the heat dissipating fins 222, and the heat dissipating efficiency is improved.

In an embodiment, referring to fig. 5 and 6, the first heat dissipation fin 2221 has a first end surface 2221a and a second end surface 2221b that are oppositely disposed, the first end surface 2221a is welded on the first substrate 2211, the second end surface 2221b and the second heat dissipation fin 2222 adjacent to both sides form a U-shaped first air guiding groove 2231 with an opening facing the second substrate 2212, an inner wall of the first air guiding groove 2231 is smooth, and the smooth inner wall is used for reducing friction with a groove wall when air flows through, so that noise inside the housing 1 can be reduced. The second heat dissipation fins 2222 are substantially U-shaped, the openings of the second heat dissipation fins 2222 face the first base plate 2211, the bottoms of the second heat dissipation fins 2222 are welded to the second base plate 2212, the second heat dissipation fins 2222 and the first base plate 2211 form a U-shaped second air guiding groove 2232, the openings of the second heat dissipation fins 2222 and the first base plate 2211 face the first base plate 2211, the inner walls of the U-shaped second air guiding groove 2232 are smooth to reduce friction force during air flow, the connection mode between the first heat dissipation fins 2221 and the first base plate 2211 and the connection mode between the bottoms of the second heat dissipation fins 2222 and the second base plate 2212 are not limited to welding, and in other embodiments, the connection modes may be a tenon joint, a bolt joint, a lock, or the.

Optionally, referring to fig. 1 and fig. 7, the air guiding assembly 3 includes a body 31 and a guiding plate 32, where the body 31 is substantially a ventilation pipe disposed between the heat sink 22 and the fan 21, and the airflow blown by the fan 21 flows onto the heat sink 22 through an inner space of the body 31, specifically, the body 31 has a first opening 31a and a second opening 31b disposed oppositely, the first opening 31a is aligned with the air outlet 211 of the fan 21, the second opening 31b is aligned with the heat sink 22, and the airflow blown by the fan 21 flows into the body 31 through the first opening 31a and flows onto the heat sink 22 through the second opening 31 b.

Since the air guide assembly 3 is provided in the gap region between the radiator 22 and the fan 21, the air flow blown out by the fan 21 flows inside the air guide assembly 3, and thus, it is possible to prevent noise from being generated due to collision or friction when the air flow flows inside the casing 1, and further, the air guide assembly 3 fills the gap region between the fan 21 and the radiator 22, so that air volume loss can be reduced, and heat dissipation efficiency can be improved.

Optionally, referring to fig. 1 and 8, the cross-sectional shape of the body 31 is a trapezoid, and the opening size of the first opening 31a is smaller than that of the first opening 31 b. By providing the body 31 with a trapezoidal cross-sectional shape such that one end of the body 31 with a small opening dimension is aligned with the fan 21 and one end with a large opening dimension is aligned with the radiator 22, the large radiator 22 can be radiated even when the air outlet surface of the fan 21 is small, but the body 31 may be a square pipe, a circular pipe, a special pipe, or the like in other embodiments.

Optionally, as shown in fig. 1 and 8, the body 31 includes a cover 311 and connection plates 312 located at two sides of the cover 311, where the cover 311 is located at an upper portion and a lower portion of the body 31, the connection plates 312 are located at a left portion and a right portion of the body 31, the cover 311 and the connection plates 312 may be integrally disposed, or may be connected by welding, bonding, or the like, the cover 311 is a trapezoidal cover 311, where a bottom surface with a smaller area is aligned with the fan 21, and another opposite bottom surface is aligned with the heat sink 22. The cover plate 311 includes a first cover plate 3111 and a second cover plate 3112 which are oppositely disposed, the first cover plate 3111 is positioned above the second cover plate 3112, one end of the first cover plate 3111 is fixed to the top of the fan 21, the other end of the first cover plate 3112 is fixed to the upper portion of the heat sink 22, one end of the second cover plate 3112 is fixed to the bottom of the fan 21, the other end of the first cover plate 3111 is fixed to the bottom of the heat sink 22, the first cover plate 3111 includes a first side 3111a and a second side 3111b which are oppositely disposed, the second cover plate 3112 includes a third side 3112c and a fourth side 3112d which are oppositely disposed, the connection plate 312 includes a first connection plate 3111 and a second connection plate 3122, one end of the first connection plate 3111 is attached to the first side 3111a, the other end of the second connection plate 3122 is attached to the second side 3111b, the opposite end is attached to the fourth side surface 3112d, and a channel is defined between the cover 311 and the connection plate 312, and the channel is used for conducting the air flow.

Alternatively, as shown in fig. 9, fig. 9 is a cross-sectional view of the air guiding assembly 3 shown in fig. 7 along the line I-I, wherein a silencing hole 313 is formed on the body 31, the silencing hole 313 is used for absorbing sound generated when the air current passes through the body 31, the silencing hole 313 refers to a plurality of small holes formed in the body 31, specifically, the body 31 includes an outer surface 31e and an inner surface 31f which are oppositely arranged, the air current passes through the inside of the body 31, the small holes refer to grooves recessed from the inner surface 31f to the outer surface 31e of the body, by forming the silencing hole 313 on the body 31, vibration of the air current in the body 31 is caused to form sound waves when the air current passes through the body 31, and part of the sound is reflected during propagation, and part of the sound goes deep into the small holes during propagation and is subjected to friction and resistance inside the small holes, therefore, the sound energy is converted into heat energy, and the purpose of noise reduction is achieved.

Optionally, referring to fig. 7 and 10, a flow guide plate 32 is disposed on the body 31, and the flow guide plate 32 is used for changing a flow direction of the airflow when the airflow passes through the body 31, so that the airflow can be blown to the channel inlet of the heat sink 22.

By providing the baffle plate 32, the air flow is made to flow to the region where the heat is concentrated on the radiator 22 or the time of the air flow inside the radiator 22 is prolonged, and the heat radiation efficiency can be further improved.

In an embodiment, referring to fig. 7 and 10, a flow guiding plate 32 is disposed on the body 31, the flow guiding plate 32 is a substantially cubic plate, the flow guiding plate 32 includes a windward surface 321 and an air outlet surface 322, the windward surface 321 is aligned with the air outlet of the fan 21, the air outlet surface 322 is aligned with the heat sink 22, and the air outlet surface 322 is located below the windward surface 321, so that the airflow flows below the heat sink 22 when passing through the flow guiding plate 32. Referring to fig. 7 and 10, the air guiding plate 32 further includes a first air guiding surface 323 and a second air guiding surface 324 disposed opposite to each other, the first air guiding surface 323 faces the first cover plate 3111, the second air guiding surface 324 faces the second cover plate 3112, when the air flow passes through the main body 31, the air flow is divided into two parts by the air guiding plate 32, one part passes through a gap between the first cover plate 3111 and the first air guiding surface 323, the other part passes through a gap between the second air guiding surface 324 and the second cover plate 3112, the second air guiding surface 324 is provided with a connecting shaft 325, the second connecting plate 314 is provided with a through hole, and the connecting shaft 325 passes through the through hole to fix the air guiding plate 32 on the main body 31.

In another embodiment, at least two flow deflectors 32 are disposed on the body 31, and when the airflow passes through the body 31, the airflow flows out to the heat sink 22 through a gap between the cover plate and the flow deflector 32 or a gap between two adjacent flow deflectors 32.

Optionally, as shown in fig. 1 and fig. 10, the projector 100 further includes a rotating mechanism 4, the rotating mechanism 4 is sleeved on the connecting shaft 325, and the rotating mechanism 4 rotates under the control of the motor to drive the connecting shaft 325 to rotate, so that the guide plate 32 fixed on the connecting shaft 325 swings up and down to increase or decrease the air flow passage.

By providing the rotating mechanism 4 inside the projector 100 to control the size of the airflow channel, the airflow channel can be closed when the projector 100 is closed, so as to prevent foreign matters such as external dust from entering the projector 100.

In an embodiment, referring to fig. 7 and 11, the rotating mechanism 4 includes a gear 41 and a rack 42 engaged with the gear 41, the gear 41 and the rack 42 are disposed outside the body 31, the body 31 is provided with a through hole, the connecting shaft 325 extends out of the body 31 through the through hole, the gear 41 is sleeved on the connecting shaft 325, the rack 42 is located on one side of the gear 41, when the projector 100 operates, the motor rotates, the rotation direction of the motor includes a first direction and a second direction opposite to each other, when the rotation direction of the motor is the first direction, the rack 42 moves linearly in the direction of the first cover 3111, so that the connecting shaft 325 connected to the gear 41 rotates counterclockwise, the gap between adjacent baffles 32 decreases, and the airflow passage inside the body 31 decreases; when the rotation direction of the motor is the second direction, the rack 42 moves linearly in the direction of the second cover plate 3112, the connection shaft 325 connected to the gear 41 rotates clockwise, the gap between the guide plates 32 increases, and the airflow passage inside the body 31 increases.

Optionally, the projector 100 further includes an air speed sensor and a controller, the air speed sensor can sense a change of an air speed and output a signal, when the air speed sensor monitors that the air speed flowing through the air deflector 32 is greater than a preset air speed, the air speed sensor sends a signal to the controller, and after receiving the signal, the controller adjusts the rotation direction of the motor to control the connecting shaft 325 to rotate, so as to increase or decrease the size of the gap area between the air deflectors, specifically, when the air speed sensor monitors that the air speed on the air deflector 32 is less than the preset air speed, the air speed sensor sends a signal to the controller, and after receiving the signal, the controller makes the motor rotate in the second direction to increase the gap between the air deflectors 32; when the wind speed sensor monitors that the wind speed on the guide plates 32 is greater than the preset wind speed, a signal is sent to the controller, and after the controller receives the signal, the motor rotates towards the first direction to reduce gaps among the guide plates 32.

By arranging the air speed sensor and the controller inside the projector 100, the size of the air flow channel can be adjusted according to the size of the air speed on the guide plate 32, so that when the air speed is higher, the gap is reduced, and the noise is reduced; when the wind speed is smaller, the gap is increased to improve the heat dissipation efficiency.

Optionally, as shown in fig. 1 and 12, the projector 100 further includes a heat pipe 5, one end of the heat pipe 5 is connected to the heat sink 22, and the other end of the heat pipe 5 is connected to a heat source inside the projector 100, where the heat pipe 5 is used to conduct the heat source inside the projector 100 to the heat sink 22, and an air flow blown by the fan 21 takes away heat from the heat sink 22, so as to achieve heat dissipation inside the housing 1.

By arranging the heat pipe 5 inside the projector 100, the heat source inside the projector 100 is conducted to the radiator 22 through the heat pipe 5, so that the heat conduction efficiency is improved, and the heat radiation process is accelerated.

In one embodiment, as shown in fig. 12, the heat pipe 5 includes a heat absorbing end 51 and a heat dissipating end 52, the heat dissipating end 52 is respectively located at two sides of the heat sink 22, the heat absorbing end 51 extends into a heat source inside the projector 100, and heat on the heat source is conducted to the heat sink 22 through the heat pipe 5.

Optionally, referring to fig. 1 and 13, the projector 100 further includes a dust baffle 6, and the dust baffle 6 is located between the ventilation opening 1211 and the heat sink 22.

By arranging the dust-blocking plate 6 at the ventilation opening 1211, when external air flow enters the shell 1, the dust and impurities are blocked, and the quality of a projection picture is ensured.

In an embodiment, as shown in fig. 13, the dust guard 6 is a filter screen, the filter screen includes a filter screen 61 and a peripheral frame 62, the frame 62 is used for supporting the filter screen, and the dust guard 6 is fixed on the heat sink 22 by screws or the like in a detachable connection manner.

The projector 100 provided by the embodiment of the application is provided with the heat dissipation device 2 inside the housing 1, so that the heat sink 22 is close to the vent 1211, the fan 21 is arranged at a position far away from the vent 1211, and noise of the fan 21 is reduced, meanwhile, the air guide assembly 3 is arranged between the fan 21 and the heat sink 22, the air guide assembly 3 fills a gap area between the heat sink 22 and the fan 21, airflow blown out by the fan 21 flows in the internal space of the air guide assembly 3, and noise generated by collision and friction between the airflow and electronic devices inside the housing 1 when the airflow flows inside the housing 1 is avoided.

The features mentioned above in the description, the claims and the drawings can be combined with one another in any desired manner, insofar as they are of significance within the scope of the application.

The foregoing is a preferred embodiment of the present application, and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

Claims (10)

1. A projector is characterized by comprising a shell, a heat dissipation device and an air guide assembly, wherein the heat dissipation device and the air guide assembly are arranged in the shell; the air guide assembly comprises a body and a guide plate, the body is provided with a cover plate and a connecting plate which are adjacently arranged, the cover plate and the connecting plate form a channel between the fan and the radiator, airflow blown out by the fan flows to the radiator through the channel, the guide plate is sleeved on the body, and the guide plate is used for changing the direction of the airflow of the fan, so that the airflow flows to the radiator along the guide plate.

2. The projector as claimed in claim 1, wherein said body is provided with a muffling hole for increasing resistance of said air flow when said fan air flow passes through said body to absorb sound generated when said air flow passes through said body.

3. The projector as defined in claim 1 wherein the heat sink includes a base plate including a first base plate and a second base plate, the first base plate being positioned above the second base plate, and a heat dissipation fin sandwiched between the first base plate and the second base plate.

4. The projector as claimed in claim 3, wherein the heat dissipating fins include a first heat dissipating fin and a second heat dissipating fin, the first heat dissipating fin and the second heat dissipating fin being spaced apart from each other to form a first air guiding groove opening toward the first substrate and a second air guiding groove opening toward the second substrate.

5. The projector as defined in claim 1 wherein the baffle includes a windward surface and an air-out surface opposite to each other, the windward surface is aligned with the fan, the air-out surface is aligned with the heat sink, and the fan airflow enters the body along the windward surface and flows out onto the heat sink along the air-out surface.

6. The projector as claimed in any one of claims 1 to 5, further comprising a rotating mechanism, wherein the rotating mechanism is sleeved on the wind guiding assembly to control the wind guiding assembly to rotate, so as to change the direction of the fan airflow.

7. The projector as claimed in claim 6, wherein the rotating mechanism includes a gear, a rack engaged with the gear, and a motor, the motor drives the rack to move linearly, the gear is sleeved on the wind guiding assembly, and the gear drives the wind guiding assembly to rotate when rotating on the rack.

8. The projector of any of claims 1 to 5 further comprising a wind speed sensor for monitoring the speed of the air flow over the deflector, and a controller receiving a wind speed change signal and feeding the wind speed change signal back to the controller, the controller adjusting the steering of the turning mechanism in accordance with the wind speed change signal.

9. The projector according to any of claims 1 to 5, further comprising a heat pipe, one end of the heat pipe being connected to the heat sink, and the opposite end being connected to a heat source inside the housing.

10. The projector according to any of claims 1 to 5, further comprising a dust shield sandwiched between the heat sink and the ventilation opening.

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