Projector and projector thermal management control method

Abstract

The invention discloses a projector and a projector thermal management control method, and relates to the technical field of projection, and the projector comprises a housing, a projection assembly, a medium and high efficiency filter screen and a fan. A first containing cavity and a second containing cavity which communicate with each other are formed in the shell. The projection assembly is arranged in the first accommodating cavity. And the medium-high-efficiency filter screen is arranged in the second accommodating cavity. The draught fan is arranged in the first containing cavity and used for sucking air in the second containing cavity so that the air passing through the medium-efficient filter screen can enter the first containing cavity from the second containing cavity. According to the technical scheme provided by the invention, the projection effect of the projector can be improved.

Description

Technical Field

[0001] The present invention relates to the field of projection technology, and in particular to a projector and a projector thermal management control method. Background Art

[0002] The projector has a built-in high-power light source and spatial light modulator. On the one hand, it will inevitably generate a lot of heat. On the other hand, the precise spatial light modulator cannot work at too high a temperature. Therefore, the projector needs a better heat dissipation system. To this end, in the related technology, a fan is used to blow air into the projector to cool it down. However, this will cause more dust in the projector, and the dust will block the projection light path and affect the projection effect. Therefore, a projector with good heat dissipation and better projection effect is needed. Summary of the invention

[0003] The main purpose of the present invention is to provide a projector and a thermal management control method for the projector, aiming to improve the projection effect of the projector.

[0004] To achieve the above object, the projector proposed by the present invention includes:

[0005] A housing having a first accommodating chamber and a second accommodating chamber formed therein;

[0006] A projection assembly, disposed in the first accommodating cavity;

[0007] A medium and high efficiency filter screen is arranged in the second accommodating chamber; and

[0008] The fan is arranged in the first accommodating chamber and is used to suck the gas in the second accommodating chamber so that the air passing through the medium and high efficiency filter screen enters the first accommodating chamber from the second accommodating chamber.

[0009] In some embodiments, the shell includes a first shell and a second shell, the first accommodating cavity is arranged in the first shell, and the second accommodating cavity is arranged in the second shell; the second shell is arranged on the outside of the first shell; the first shell and the second shell are arranged separately or integrally.

[0010] In some embodiments, the first shell includes a first end wall and a first side wall, and the first side wall extends from an edge of the first end wall to one side of the first end wall;

[0011] The second shell includes a second side wall and a second end wall, wherein the second side wall is disposed on a side of the first end wall facing away from the first side wall and extends from an edge of the first end wall in a direction away from the first side wall;

[0012] The second end wall is arranged on the edge of the second side wall away from the first end wall, and together with the first end wall encloses the second accommodating cavity; the second end wall is provided with an installation cavity recessed toward the first end wall and entering the second accommodating cavity, and the medium and high efficiency filter is arranged in the installation cavity.

[0013] In some embodiments, the medium and high efficiency filter is in the shape of a plate, and on a projection plane parallel to the medium and high efficiency filter, the area of ​​the orthographic projection of the medium and high efficiency filter onto the projection plane is 90 percent or more of the area of ​​the orthographic projection of the first end wall onto the projection plane; and / or

[0014] The medium and high efficiency filter is a HEPA filter.

[0015] In some embodiments, the second shell further includes a mounting wall and a limiting rib, wherein the mounting wall extends from the second end wall to the first end wall and surrounds the mounting cavity; the limiting rib extends from the edge of the first end wall into the mounting cavity and abuts against the side of the medium and high efficiency filter mesh facing the first end wall; the limiting rib is at least partially spaced apart from the first end wall to form an air intake cavity between the limiting rib and the first end wall.

[0016] In some embodiments, an air inlet communicating with the second accommodating cavity is provided on the first end wall; the medium and high efficiency filter is in the shape of a plate, and on a projection plane parallel to the medium and high efficiency filter, a projection of the air inlet onto the projection plane is outside a projection of the air inlet cavity on the projection plane; and / or

[0017] The projector further comprises a grille, which is arranged on a side of the medium and high efficiency filter screen facing away from the limiting ribs and abuts against the medium and high efficiency filter screen.

[0018] In some embodiments, the second shell further includes a blocking portion disposed in the second accommodating cavity; an exhaust port is opened on the first shell, and the blocking portion is used to block a portion of the exhaust port exposed in the second accommodating cavity.

[0019] In some embodiments, the fan includes a centrifugal fan and an axial flow fan; the centrifugal fan and the axial flow fan are both arranged in the first accommodating chamber; the centrifugal fan is used to draw gas from the second accommodating chamber into the first accommodating chamber; the axial flow fan is used to push the gas in the first accommodating chamber out of the first accommodating chamber.

[0020] In some embodiments, the projection assembly includes a light source, a heat conductive member, and a heat dissipation fin disposed in the first accommodating cavity; one end of the heat conductive member is thermally connected to the light source, and the other end is thermally connected to the heat dissipation fin; the axial flow fan is used to transport gas to the heat dissipation fin so that the gas passes through the heat dissipation fin and is discharged from the projector; and / or

[0021] The projector also includes a spatial light modulator arranged in the first accommodating cavity; the spatial light modulator is plate-shaped and forms a central air duct, and the central air duct has a first end and a second end opposite to each other; the first shell forms an arc-shaped air duct, the arc-shaped air duct is connected to the first end of the central air duct, and extends from the first end to a direction away from the spatial light modulator along the surface normal of the spatial light modulator; the centrifugal fan is used to supply air to the end of the arc-shaped air duct away from the first end; the first shell also forms an air outlet cavity, the air outlet cavity is connected to the second end of the central air duct, and extends from the second end to a direction away from the arc-shaped air duct along the surface normal of the spatial light modulator; the axial flow fan is arranged in the air outlet cavity on one side away from the central air duct.

[0022] The present invention further provides a projector thermal management control method for controlling the above-mentioned projector, wherein the projector further comprises a spatial light modulator disposed in the first accommodating cavity, a heat dissipation channel is formed in the first accommodating cavity, and the spatial light modulator is located in the middle of the heat dissipation channel. The method comprises:

[0023] Turning off the projector when the temperature upstream of the heat dissipation channel is greater than or equal to a first preset temperature; and / or

[0024] Turning off the projector when the temperature downstream of the heat dissipation channel is greater than or equal to a second preset temperature; and / or

[0025] The projector is turned off when the difference between the temperature downstream and the temperature upstream of the heat dissipation channel is greater than or equal to a preset difference.

[0026] In the technical solution of the present invention, the air flow sucked into the first shell by the fan is filtered by a medium and high efficiency filter, so that the gas entering the projector does not contain large particles of dust. While achieving sufficient heat dissipation effect, it does not introduce particulate matter to hinder the propagation of light, thereby improving the projection effect of the projector. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 A schematic diagram of a three-dimensional assembly structure of an embodiment of a projector provided by the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of a first exploded structure of the projector;

[0030] Figure 3 for Figure 1 Schematic diagram of the upward viewing angle structure of the projector;

[0031] Figure 4 for Figure 1 The projector is Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0032] Figure 5 for Figure 1 A second exploded structural diagram of the projector;

[0033] Figure 6 for Figure 1 The schematic diagram of the structure of the projector after removing the top cover;

[0034] Figure 7 for Figure 1 Schematic diagram of the structure of the projector after removing the top cover and centrifugal fan;

[0035] Figure 8 for Figure 1 A schematic structural diagram of a first shell of a projector;

[0036] Fig. 9 for Figure 1 Schematic diagram of the structure of the projector from a top view after removing the top cover;

[0037] Fig.10 for Figure 1 Schematic diagram of the assembly structure of the light source, heat conduction parts and heat dissipation fins of the projector.

[0038] Description of Figure Numbers:

[0039] Projector 10;

[0040] First housing 11; first accommodating chamber 111; first end wall 112; air inlet 1121; first side wall 113; air outlet 114; arc-shaped air duct 115; air outlet chamber 116;

[0041] Projection assembly 12; light source 121; heat conducting member 122; heat dissipation fin 123; spatial light modulator 124; central air duct 1241, first end 12411, second end 12412; Fresnel lens 1242; LCD panel 1243; polarizing plate 1244; focusing cup 125; reflector 126; lens group 127;

[0042] The second housing 13; the second accommodating cavity 131; the second side wall 132; the second end wall 133; the mounting cavity 1331; the mounting wall 134; the limiting rib 135; the air suction cavity 136; the blocking portion 137;

[0043] Medium and high efficiency filter 14;

[0044] Fan 15; centrifugal fan 151; axial flow fan 152;

[0045] Grille 16;

[0046] Air duct cover 17;

[0047] Top cover 18.

[0048] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that if the implementation methods of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various implementation methods can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The invention provides a projector.

[0053] Please refer to Figure 1 and Figure 2 In one embodiment of the present invention, the projector 10 includes a housing, a projection assembly 12, a medium and high efficiency filter 14, and a fan 15. A first accommodating chamber 111 and a second accommodating chamber 131 are formed in the housing. The projection assembly 12 is disposed in the first accommodating chamber 111. The medium and high efficiency filter 14 is disposed in the second accommodating chamber 131. The fan 15 is disposed in the first accommodating chamber 111 and is used to suck the gas in the second accommodating chamber 131 so that the air passing through the medium and high efficiency filter 14 enters the first accommodating chamber 111 from the second accommodating chamber 131.

[0054] The housing is the installation base of each component in the projector, and the first accommodating cavity 111 and the second accommodating cavity 131 formed in the housing are spaces for installing each component. In some embodiments, the first accommodating cavity 111 can be used to install functional components of the projector 10, that is, each component in the projection assembly 12 and other components with playback functions, such as a loudspeaker.

[0055] The second accommodating chamber 131 can be used to accommodate the medium and high efficiency filter screen 14 to fix the medium and high efficiency filter screen 14 in the housing. The first accommodating chamber 111 and the second accommodating chamber 131 can directly form a complete cavity to communicate with each other; the first accommodating chamber 111 and the second accommodating chamber 131 can also be connected through the air inlet ( Figure 2 The air inlet 1121 is shown connected.

[0056] The projection component 12 is a component that modulates light into projection light and projects it out of the projector 10. It can usually include a light source, a light modulator, and a lens. Please refer to Figure 6 and Fig.10 ,exist Figure 6and Fig.10 In the illustrated embodiment, the projection assembly 12 includes a light source 121, a focusing cup 125, a spatial light modulator 124, a reflector 126, and a lens group 127; wherein the light source 121 generates usable light, and the focusing cup 125 shapes the light of the light source 121 into incident light for the spatial light modulator 124; the spatial light modulator 124 loads image information into its output light, and the reflector 126 reflects the projection light with the image information and then enters the lens group 127, and the lens group 127 finally projects the light with the image information out of the projector 10 to form a projection image. In some embodiments, the lens group 127 can be focused so that the projection image can be formed on a projection surface at different distances from the projector 10.

[0057] In some other embodiments, the projection assembly 12 can be of other configurations. In one example, the projector can use a reflective spatial light modulator; it can also be equipped with a light combiner, and the light source can generate three-color light. The spatial light modulator modulates the different colors of the three-color light respectively, and the light combiner is used to combine the modulated three-color light and finally input it into the lens group to project the projector.

[0058] The first accommodating chamber 111 is connected to the second accommodating chamber 131, so that the fan 15 disposed in the first accommodating chamber 111 can extract air from the second accommodating chamber 131 and send it into the first accommodating chamber 111. The fan can be an axial flow fan, a cross flow fan, a centrifugal fan, etc.

[0059] The medium and high efficiency filter 14 is a gas filter, which can be a high efficiency filter (HEPA), a sub-high efficiency filter (Sub-HEPA) or a medium efficiency filter (Medium Efficiency). The medium and high efficiency filter 14 has a good filtering effect on gas and also has a high filtering efficiency, which can ensure a low air intake resistance and a large air intake volume, ensure the heat dissipation inside the projector 10 while preventing large suspended particles from entering the projector 10, and especially effectively prevent particles with a diameter of more than 2.5 μm from entering the projector 10. In this way, there are no particles inside the projector 10 to hinder the projection of light, so the projection effect of the projector 10 can be improved.

[0060] Please refer to Figure 1 and Figure 2 In some embodiments, the shell includes a first shell 11 and a second shell 13, the first accommodating cavity 111 is arranged in the first shell 11, and the second accommodating cavity 131 is arranged in the second shell 13; the second shell 13 is arranged on the outside of the first shell 11; the first shell 11 and the second shell 13 are arranged separately or integrally.

[0061] The first housing 11 may be the main housing of the projector 10, and the first housing 11 may be enclosed with the top cover 18 to close the first accommodating cavity 111. A window may be provided on the first housing 11 for projection of projection light to project an image on a target projection surface. A sound grille 16 may be provided on the first housing 11 for the loudspeaker disposed in the first accommodating cavity 111 to transmit sound to the outside of the projector 10 for the user to listen to.

[0062] The second housing 131 formed by the second housing 13 provides installation space for the medium and high efficiency filter 14, and the second housing 13 is the installation base of the medium and high efficiency filter 14. The second housing 13 is arranged outside the first housing 11, which means that the second housing 13 is at least partially exposed outside the first housing 111.

[0063] The second housing 13 can be integrally provided with the first housing 11, or can be separately provided with the first housing 11. When the second housing 13 is separately provided with the first housing 11, the second housing 13 can be screwed, riveted, bonded and / or buckled with the first housing 11. In particular, please refer to Figure 1 In some embodiments, the first shell 11 and the second shell 13 are aligned in the front-to-back and left-to-right directions of the projector 10 , which increases the integrity of the projector 10 and facilitates the transportation and storage of the projector 10 .

[0064] When the first shell 11 and the second shell 13 are integrally provided, the first shell 11 and the second shell 13 can be integrally injection molded, or secondary injection molded, or integrally provided in the form of welding.

[0065] The first shell 11 and the second shell 13 are arranged separately, which can make the molding of the first shell 11 and the second shell 13 simpler and easier to implement. The first shell 11 and the second shell 13 are arranged in one piece, which can improve the connection strength of the first shell 11 and the second shell 13 and make the projector more integrated.

[0066] Please refer to Figure 1 The second housing 13 may be disposed below the first housing 11. In other embodiments, the second housing 13 may also be disposed above the first housing 11 (i.e. Figure 2 position of the middle top cover).

[0067] Please refer to Figures 3 to 5 In some embodiments, the first housing 11 includes a first end wall 112 and a first side wall 113, and the first side wall 113 extends from an edge of the first end wall 112 to one side of the first end wall 112;

[0068] The second housing 13 includes a second side wall 132 and a second end wall 133 . The second side wall 132 is disposed on a side of the first end wall 112 facing away from the first side wall 113 , and extends from an edge of the first end wall 112 toward a direction away from the first side wall 113 .

[0069] The second end wall 133 is arranged on the edge of the second side wall 132 away from the first end wall 112, and together with the first end wall 112 encloses the second accommodating cavity 131; the second end wall 133 is provided with an installation cavity 1331 which is recessed toward the first end wall 112 and enters the second accommodating cavity 131, and the medium and high efficiency filter 14 is arranged in the installation cavity 1331.

[0070] The first end wall 112 may be the bottom wall or the top wall of the first shell 11. When the first end wall 112 is the bottom wall of the first shell, the second end wall 133 is the bottom wall of the second shell 13; when the first end wall 112 is the top wall of the first shell 11, the second end wall 133 is the top wall of the second shell 13.

[0071] Since the various components in the projection assembly 12 can be laid on the first end wall 112 in the first accommodating chamber 111, the surface area of ​​the first end wall 112 is often the wall with the largest surface area on the first shell 11. The second shell 13 is arranged on one side of the first end wall 112, and can have a larger installation area, or the second accommodating chamber 131 can have a larger bottom area. The installation chamber 1331 is recessed into the second accommodating chamber 131, so the second accommodating chamber 131 has a larger bottom area, and the installation chamber 1331 can also have a larger bottom area. The medium and high efficiency filter 14 is usually in the shape of a plate, and the large bottom area of ​​the installation chamber 1331 allows a larger medium and high efficiency filter 14 to be arranged. The filtering resistance of the medium and high efficiency filter 14 is negatively correlated with its surface area. It can be seen that such a setting can increase the surface area of ​​the medium and high efficiency filter 14, thereby reducing the filtering resistance, increasing the air intake into the first accommodating chamber 111, and improving the heat dissipation efficiency of the projector 10.

[0072] Please refer to Figure 4 In some embodiments, the medium and high efficiency filter screen 14 is in the shape of a plate. On a projection plane parallel to the medium and high efficiency filter screen 14, the area of ​​the orthographic projection of the medium and high efficiency filter screen 14 onto the projection plane is 90 percent or more of the area of ​​the orthographic projection of the first end wall 112 onto the projection plane.

[0073] Figure 4 The projection surface shown by the dotted line is Figure 4 A projection plane parallel to the high efficiency filter 14 of the projector 10. Figure 4The projection in the direction of the arrow is the orthographic projection onto the projection surface. On the projection surface, the orthographic projection area of ​​the medium and high efficiency filter 14 is 90 percent or more of the orthographic projection area of ​​the first end wall 112, so that the area of ​​the medium and high efficiency filter 14 is large enough, so that the filtering resistance of the medium and high efficiency filter 14 is low enough, the flow rate of the air supplied by the fan 15 to the first accommodating chamber 111 is increased, and the heat dissipation capacity of the projector 10 is improved.

[0074] In some implementations, the medium and high efficiency filter 14 is a HEPA filter. The HEPA filter is a high efficiency filter that can have lower filtration resistance and higher filtration efficiency, thereby improving the projection effect and heat dissipation capacity of the projector 10.

[0075] Please refer to Figure 4 and Figure 5 In some embodiments, the second shell 13 further includes a mounting wall 134 and a limiting rib 135, wherein the mounting wall 134 extends from the second end wall 133 to the first end wall 112 and surrounds the mounting cavity 1331; the limiting rib 135 extends from the edge of the first end wall 112 into the mounting cavity 1331 and abuts against the side of the medium and high efficiency filter screen 14 facing the first end wall 112; the limiting rib 135 and the first end wall 112 are at least partially spaced apart to form an air intake cavity 136 between the limiting rib 135 and the first end wall 112.

[0076] The limiting ribs 135 can limit the middle and high efficiency filter screen 14 to prevent the middle and high efficiency filter screen 14 from being attracted by negative pressure and contacting the first end wall 112, so that the first end wall 112 and the middle and high efficiency filter screen 14 are always separated to form an air suction cavity 136. The air suction cavity 136 allows the outlet side of the middle and high efficiency filter screen to be fully exposed, ensuring that all parts of the middle and high efficiency filter screen 14 can participate in the filtration, and there will be no areas that do not participate in the filtration due to obstruction. In this way, the effective filtration area of ​​the middle and high efficiency filter screen 14 can be increased, thereby reducing the filtration resistance.

[0077] Please refer to Figure 4 and Figure 7 In some embodiments, an air inlet 1121 communicating with the second accommodating chamber 131 is provided on the first end wall 112; the medium and high efficiency filter screen 14 is plate-shaped, and on a projection plane parallel to the medium and high efficiency filter screen 14, the projection of the air inlet 1121 onto the projection plane is outside the projection of the suction chamber 136 on the projection plane.

[0078] In one example, Figure 4 On the projection surface shown, it can be seen that Figure 4Projected in the direction of the middle arrow, on the projection surface shown by the dotted line, the projection of the air inlet 1121 is outside the projection of the air inlet cavity 136. It can be seen that such a setting allows the air inlet 1121 to not face the air inlet cavity 136, that is, not face the medium and high efficiency filter 14. It can be seen that the negative pressure at the air inlet 1121 is the largest, and the air inlet 1121 is not facing the medium and high efficiency filter 14, which can avoid the formation of a large air pressure gradient on the plane where the medium and high efficiency filter 14 is located, thereby ensuring that the negative pressure at various locations on the medium and high efficiency filter 14 is basically the same, and then more evenly utilizing the filtering capacity at various locations on the medium and high efficiency filter 14, thereby reducing the speed at which the filtering resistance increases with the increase in usage time and increasing the service life of the medium and high efficiency filter 14.

[0079] Please refer to Figures 2 to 4 The projector 10 further includes a grille 16 , which is disposed on a side of the medium and high efficiency filter 14 facing away from the limiting rib 135 and abuts against the medium and high efficiency filter 14 .

[0080] It can be seen that the limiting ribs 135 and the grille 16 can clamp the medium and high efficiency filter screen 14 from both sides of the medium and high efficiency filter screen 14, thereby improving the installation stability of the medium and high efficiency filter screen 14. The grille 16 can be screwed, riveted and / or buckled to the second housing 13.

[0081] Please refer to Figure 5 In some embodiments, the second shell 13 further includes a blocking portion 137 disposed in the second accommodating cavity 131 ; an exhaust port 114 is opened on the first shell 11 , and the blocking portion 137 is used to block the portion of the exhaust port 114 exposed in the second accommodating cavity 131 .

[0082] Since the second shell 13 is completely independent of the first shell 11, the second shell 13 and the medium and high efficiency filter 14 can be used as an auxiliary structure of the projector 10, and are designed to be installed on the already designed first shell 11 as an upgrade kit of the projector 10. At this time, the exhaust port 114 on the first shell 11 may be partially opened toward the first end wall 112 of the first shell 11, and when the second shell 13 is installed on one side of the first end wall 112, the part of the exhaust port 114 facing the first end wall 112 may be exposed to the second accommodating chamber 131. The blocking portion 137 blocks the part of the exhaust port 114 exposed to the second accommodating chamber 131, which can prevent the gas discharged from the exhaust port 114 from entering the second accommodating chamber 131 and being sucked into the first accommodating chamber 111 for the second time. It can be seen that the gas discharged from the exhaust port 114 passes through the inside of the projector 10 and has been used for heat dissipation. Therefore, the gas with a higher temperature is prevented by the blocking portion 137 from entering the first accommodating chamber 111, thereby improving the heat dissipation capacity of the projector 10.

[0083] The blocking portion 137 blocks the portion of the exhaust port 114 exposed to the second accommodating cavity 131 , but this does not mean that the portion needs to be sealed off from the outside of the projector 10 . It only needs to be sealed off from the second accommodating cavity 131 , that is, the portion can also have the ability to exhaust air to the outside.

[0084] Please refer to Figure 6 and Figure 7 In some embodiments, the fan 15 includes a centrifugal fan 151 and an axial flow fan 152; the centrifugal fan 151 and the axial flow fan 152 are both arranged in the first accommodating chamber 111; the centrifugal fan 151 is used to draw gas from the second accommodating chamber 131 into the first accommodating chamber 111; the axial flow fan 152 is used to push the gas in the first accommodating chamber 111 out of the first accommodating chamber 111.

[0085] The centrifugal fan 151 has a strong suction capacity and is disposed in the upwind area of ​​the first accommodating chamber 111 to ensure that the gas flow entering the first accommodating chamber 111 is sufficient; the axial flow fan 152 has a large air inlet area and can easily absorb the stray airflow in the first accommodating chamber 111 to ensure that the high-temperature gas after heat exchange can be discharged from the projector 10, thereby improving the heat dissipation capacity of the projector 10.

[0086] Please refer to Figure 7 and Fig.10 In some embodiments, the projection assembly 12 includes a light source 121, a heat conductor 122, and a heat dissipation fin 123 disposed in the first accommodating cavity 111; one end of the heat conductor 122 is thermally connected to the light source 121, and the other end is thermally connected to the heat dissipation fin 123; the axial flow fan 152 is used to transport gas to the heat dissipation fin 123, so that the gas passes through the heat dissipation fin 123 and is discharged from the projector 10.

[0087] The heat conducting member 122 is a device with good heat conduction, such as a metal or alloy with good heat conduction, or a heat pipe, or a combination of multiple heat conducting devices, such as Fig.10 In the illustrated embodiment, the heat conducting member 122 is a combination of a heat receiving block and a heat pipe. The heat receiving block evenly transfers the heat of the light source 121 to the heat pipe, and the heat pipe then transfers the heat to the heat dissipating fins 123 or directly dissipates the heat to the air. At this time, the axial flow fan 152 can deliver gas to the heat dissipating fins 123, so that the heat dissipated into the gas by the heat dissipating fins 123 and the heat pipe is discharged from the projector 10, thereby improving the heat dissipation capacity of the projector 10.

[0088] The heat conduction connection refers to a direct or indirect connection. In one example, the light source 121 and the heat conducting member 122 are in direct contact for heat conduction connection. In another example, heat conduction silicone is coated between the light source 121 and the heat conducting member 122 for heat conduction connection. The heat sink 123 and the heat conducting member 122 can also be heat-conductedly connected directly or indirectly.

[0089] Since the axial fan 152 is arranged in the downwind area of ​​the first accommodating chamber 111, and the light source 121 is a device with relatively large heat generation in the projector 10, the gas used to dissipate heat for the light source 121 is directly discharged from the downwind area of ​​the first accommodating chamber 111, which helps to protect other devices in the first accommodating chamber 111 and prevent other devices from overheating.

[0090] There are at least two ways for the axial flow fan 152 to deliver air to the heat dissipation fins 123. One way is that the heat dissipation fins 123 are arranged on the air outlet side of the axial flow fan 152, and the axial flow fan 152 blows air to the heat dissipation fins 123 ( Figure 7 The embodiment shown in the figure adopts this solution); the second is that the heat dissipation fins 123 are arranged on the air inlet side of the axial flow fan 152, and the axial flow fan 152 inhales air from the heat dissipation fins 123 (i.e., at Figure 7 In the illustrated embodiment, the positions of the heat dissipation fins 123 and the axial flow fan 152 are exchanged to form an air supply path from the heat dissipation fins 123 and the axial flow fan 152 to the exhaust port 114).

[0091] Please refer to Figure 8 and Fig. 9 , in some embodiments, the projector 10 further includes a spatial light modulator 124 disposed in the first accommodating cavity 111;

[0092] The spatial light modulator 124 is plate-shaped and has a central air duct 1241 formed therein. The central air duct 1241 has a first end 12411 and a second end 12412 opposite to each other.

[0093] The first housing 11 is formed with an arc-shaped air duct 115, which is connected to the first end 12411 of the central air duct 1241 and extends from the first end 12411 to a direction away from the spatial light modulator 124 along the surface normal of the spatial light modulator 124; the centrifugal fan 151 is used to supply air to an end of the arc-shaped air duct 115 away from the first end 12411;

[0094] The first shell 11 also forms an air outlet cavity 116, which is connected to the second end 12412 of the central air duct 1241 and extends from the second end 12412 along the surface normal of the spatial light modulator 124 in a direction away from the arc-shaped air duct 115; the axial flow fan 152 is arranged on one side of the air outlet cavity 116 away from the central air duct 1241.

[0095] Please refer to Fig. 9 It can be seen that the air duct arranged in this way is basically in a "Z" shape and basically covers all devices that need heat dissipation, which helps to make the projector 10 compact and miniaturized.

[0096] Please refer to Figure 2 and Fig. 9The curved air duct 115, the central air duct 1241 and the air outlet cavity 116 can be closed compared to other parts in the first accommodating cavity 111. In one example, the first shell 11 and the air duct cover 17 enclose the curved air duct 115, the central air duct 1241 and the air outlet cavity 116 to form a relatively closed air duct in the first accommodating cavity 111; in another example, the curved air duct 115, the central air duct 1241 and the air outlet cavity 116 are open compared to other parts in the first accommodating cavity 111.

[0097] A power circuit board may also be disposed in the air outlet cavity 116 to dissipate heat from the power circuit board.

[0098] Please refer to Figure 6 , Figure 7 and Fig. 9 In some embodiments, the spatial light modulator 124 includes a Fresnel lens 1242, an LCD panel 1243, and a polarizing plate 1244 that are spaced apart from each other, parallel to each other, and arranged in sequence; a central air duct 1241 is formed between the Fresnel lens 1242 and the LCD panel 1243 and between the LCD panel 1243 and the polarizing plate 1244.

[0099] The polarizing plate 1244 and the LCD panel 1243 will partially absorb the light from the light source 121, thereby generating heat. The LCD panel 1243 may also be provided with a TFT (thin film transistor), which will usually generate heat. The liquid crystal material in the LCD and the polarizing plate 1244 are easily damaged at high temperatures. Therefore, the central air duct 1241 is formed between the Fresnel lens 1242 and the LCD panel 1243 and between the LCD panel 1243 and the polarizing plate 1244 to directly dissipate heat for the LCD panel 1243 and the polarizing plate 1244, thereby preventing the LCD panel 1243 and the polarizing plate 1244 from overheating and extending the service life of the LCD panel 1243 and the polarizing plate 1244.

[0100] The present invention further provides a projector thermal management control method, which is used for a projector. The specific structure of the projector refers to the above-mentioned embodiment.

[0101] The projector further includes a spatial light modulator disposed in the first accommodating cavity, a heat dissipation channel is formed in the first accommodating cavity, and the spatial light modulator is located in the middle of the heat dissipation channel. The method includes:

[0102] Turning off the projector when the temperature upstream of the heat dissipation channel is greater than or equal to a first preset temperature; and / or

[0103] Turning off the projector when the temperature downstream of the heat dissipation channel is greater than or equal to a second preset temperature; and / or

[0104] The projector is turned off when the difference between the temperature downstream and the temperature upstream of the heat dissipation flow channel is greater than or equal to a preset difference.

[0105] The implementation of the spatial light modulator can refer to the implementation of the projector described above. The heat dissipation channel can be as follows: Fig. 9 The flow channel with a clear channel shown (i.e., the flow channel formed by the arc duct 115, the central duct 1241, and the air outlet cavity 116) may also be a flow channel without a clear channel, which is just a virtual flow channel with a flow trend from the air inlet (1121) on the first shell to the exhaust port (114).

[0106] The spatial light modulator is located in the middle of the heat dissipation channel, so the gas upstream of the heat dissipation channel is the gas that does not exchange heat with the spatial light modulator, and the gas downstream of the heat dissipation channel is the gas that completes heat dissipation with the spatial light modulator.

[0107] The temperature upstream of the heat dissipation channel may be the ambient temperature, that is, the gas upstream of the heat dissipation channel has not yet exchanged heat with the heating device in the projector. Fig. 9 To measure the temperature upstream of the heat dissipation channel, a temperature sensor can be provided between the centrifugal fan 151 and the reflector 126. Fig. 9 The air intake side of the centrifugal fan in the embodiment.

[0108] The temperature downstream of the heat dissipation channel may be the temperature of the gas after heat exchange with the spatial light modulator. Fig. 9 To measure the temperature downstream of the heat dissipation channel, a temperature sensor can be set in the air outlet cavity 116, here is Fig. 9 The air intake side of the axial flow fan in the embodiment.

[0109] If the upstream temperature of the heat dissipation channel is greater than or equal to the first preset temperature, it indicates that the ambient temperature is too high. Even if the air intake flow is sufficient, it may not meet the heat dissipation requirements of the projector. At this time, the projector is turned off to protect it from overheating.

[0110] The downstream temperature of the heat dissipation channel being greater than or equal to the second preset temperature indicates that the temperature of the spatial light modulator is too high (causing the temperature of the gas to rise to or above the second preset temperature after heat exchange with the spatial light modulator). At this time, the projector is turned off to protect the spatial light modulator from being damaged by high temperature.

[0111] When the difference between the temperature downstream and upstream of the heat dissipation channel is too large, it indicates that the temperature of the spatial light modulator may rise a lot in a short time. At this time, although the temperature downstream may not be greater than the second preset temperature, this may be due to the limitation of heat exchange efficiency. The spatial light modulator itself may have exceeded its operating temperature. Therefore, turning off the projector at this time can protect the spatial light modulator from being damaged by high temperature.

[0112] It can be seen that the above-mentioned projector thermal management control method can protect the projector and avoid damage to the projector.

[0113] Turning off the projector can be turning off the total power of the projector, or it can be turning off only the light source of the projector while keeping other devices working. In one example, when executing the instruction to turn off the projector, the fan is kept in working state and the light source is turned off, so that the fan can further dissipate the preheat in the projector.

[0114] The monitoring of the upstream temperature, the downstream temperature, and the difference between the downstream temperature and the upstream temperature can be performed selectively, either or both or all of them. When monitoring the corresponding temperatures or temperature differences, the operation of shutting down the projector can be executed as long as the upstream temperature is greater than or equal to the first preset temperature, the downstream temperature is greater than or equal to the second preset temperature, and the difference between the downstream temperature and the upstream temperature is greater than or equal to the preset difference.

[0115] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A projector, characterized in that: include: A housing having a first accommodating cavity and a second accommodating cavity formed therein; A projection assembly, disposed in the first accommodating cavity; A medium and high efficiency filter screen is arranged in the second accommodating chamber; and The fan is arranged in the first accommodating chamber and is used to suck the gas in the second accommodating chamber so that the air passing through the medium and high efficiency filter screen enters the first accommodating chamber from the second accommodating chamber.

2. The projector according to claim 1, wherein: The shell includes a first shell and a second shell, the first accommodating cavity is arranged in the first shell, and the second accommodating cavity is arranged in the second shell; the second shell is arranged on the outside of the first shell; the first shell and the second shell are arranged separately or integrally.

3. The projector according to claim 2, characterized in that The first shell includes a first end wall and a first side wall, wherein the first side wall extends from an edge of the first end wall to one side of the first end wall; The second shell includes a second side wall and a second end wall, wherein the second side wall is disposed on a side of the first end wall facing away from the first side wall and extends from an edge of the first end wall in a direction away from the first side wall; The second end wall is arranged on the edge of the second side wall away from the first end wall, and together with the first end wall encloses the second accommodating cavity; the second end wall is provided with an installation cavity recessed toward the first end wall and entering the second accommodating cavity, and the medium and high efficiency filter is arranged in the installation cavity.

4. The projector according to claim 3, characterized in that The medium and high efficiency filter is plate-shaped, and on a projection plane parallel to the medium and high efficiency filter, the area of ​​the orthographic projection of the medium and high efficiency filter onto the projection plane is 90 percent or more of the area of ​​the orthographic projection of the first end wall onto the projection plane; and / or The medium and high efficiency filter is a HEPA filter.

5. The projector according to claim 3, characterized in that: The second shell also includes a mounting wall and a limiting rib, wherein the mounting wall extends from the second end wall to the first end wall and surrounds the mounting cavity; the limiting rib extends from the edge of the first end wall into the mounting cavity and abuts against the side of the medium and high efficiency filter screen facing the first end wall; the limiting rib is at least partially spaced apart from the first end wall to form an air intake cavity between the limiting rib and the first end wall.

6. The projector according to claim 5, characterized in that The first end wall is provided with an air inlet connected to the second accommodating cavity; the medium and high efficiency filter screen is in the shape of a plate, and on a projection plane parallel to the medium and high efficiency filter screen, the projection of the air inlet onto the projection plane is outside the projection of the air inlet cavity on the projection plane; and / or The projector further comprises a grille, which is arranged on a side of the medium and high efficiency filter screen facing away from the limiting ribs and abuts against the medium and high efficiency filter screen.

7. The projector according to claim 2, characterized in that: The second shell further includes a blocking portion disposed in the second accommodating chamber; an exhaust port is provided on the first shell, and the blocking portion is used to block a portion of the exhaust port exposed in the second accommodating chamber.

8. The projector according to claim 2, wherein: The fan includes a centrifugal fan and an axial flow fan; the centrifugal fan and the axial flow fan are both arranged in the first accommodating chamber; the centrifugal fan is used to draw gas from the second accommodating chamber into the first accommodating chamber; the axial flow fan is used to push the gas in the first accommodating chamber out of the first accommodating chamber.

9. The projector according to claim 8, characterized in that The projection assembly comprises a light source, a heat conducting member and a heat dissipation fin arranged in the first accommodating cavity; one end of the heat conducting member is heat-conductingly connected to the light source, and the other end is heat-conductingly connected to the heat dissipation fin; the axial flow fan is used to transport gas to the heat dissipation fin, so that the gas passes through the heat dissipation fin and then is discharged from the projector; and / or The projector also includes a spatial light modulator arranged in the first accommodating cavity; the spatial light modulator is plate-shaped and forms a central air duct, and the central air duct has a first end and a second end opposite to each other; the first shell forms an arc-shaped air duct, the arc-shaped air duct is connected to the first end of the central air duct, and extends from the first end to a direction away from the spatial light modulator along the surface normal of the spatial light modulator; the centrifugal fan is used to supply air to the end of the arc-shaped air duct away from the first end; the first shell also forms an air outlet cavity, the air outlet cavity is connected to the second end of the central air duct, and extends from the second end to a direction away from the arc-shaped air duct along the surface normal of the spatial light modulator; the axial flow fan is arranged in the air outlet cavity on one side away from the central air duct.

10. A projector thermal management control method, characterized in that: Used to control the projector according to any one of claims 1 to 9, the projector further comprising a spatial light modulator disposed in the first accommodating cavity, a heat dissipation channel being formed in the first accommodating cavity, the spatial light modulator being located in the middle of the heat dissipation channel, the method comprising: Turning off the projector when the temperature upstream of the heat dissipation channel is greater than or equal to a first preset temperature; and / or Turning off the projector when the temperature downstream of the heat dissipation channel is greater than or equal to a second preset temperature; and / or The projector is turned off when the difference between the temperature downstream and the temperature upstream of the heat dissipation channel is greater than or equal to a preset difference.

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