Projector with screen frame having high heat dissipation capability

Abstract

The present invention discloses a projector with a screen frame having high heat dissipation capability, the projector comprising a projector housing and a screen frame housing arranged inside the projector housing, the screen frame housing being connected to a heat exchanger, and the two sides of the heat exchanger are respectively a secondary heat dissipation channel and a primary heat dissipation channel. The top of the primary heat dissipation channel is located in the same closed chamber as the air inlet of an internal circulation fan through an air outlet; the air outlet of the internal circulation fan is connected to one end of the internal circulation channel, the other end of the internal circulation channel is connected to the primary heat dissipation channel, and a display device connected to the primary heat dissipation channel is arranged inside, and a Fresnel lens and a heat-insulating glass are arranged on both sides of the display device, respectively; and together with the primary heat dissipation channel, a closed chamber is formed; the internal circulation channel passes through the display device body and forms a top channel and a bottom channel along the airflow direction, and a convex piece is arranged on the surface of the channel, and the height of the convex piece is 1 / 6-1 / 3 of the height of the display device.

Description

Technical Field

[0001] The invention belongs to the field of optical projection devices, and relates to a projector with a screen frame with high heat dissipation capability. Background Art

[0002] A projector is a device that can project images or videos onto a screen. It can be connected to computers, VCDs, DVDs, BDs, game consoles, DVs, etc. through different interfaces to play corresponding video signals. LCD projectors are a type of projector that have the advantages of low cost, good color reproduction, high resolution, and moderate size. They are currently the mainstream product in the low-end projector market.

[0003] When using, from UHP light source to LED light source to laser light source, the system power consumption is getting higher and higher, and the heat generated is also increasing. The brightness is also getting higher and higher, but the heat resistance of the LCD screen has always been low. If the heat on the LCD screen cannot be dissipated in time and effectively, it will cause the problem of overheating and damaging the LCD screen. Summary of the invention

[0004] The purpose of the present invention is to provide a projector with a screen frame with high heat dissipation capacity, which can efficiently transfer the heat on the liquid crystal screen in a closed environment and then dissipate the heat through external circulation.

[0005] The technical solution adopted by the present invention is as follows:

[0006] In order to solve the heat dissipation and dust problems of traditional LCD projectors, dual-circulation heat dissipation is used to prevent dust, and the screen frame with high heat dissipation capacity is used to solve the problem of internal circulation heat dissipation under high brightness and high power conditions.

[0007] A projector with a screen frame having high heat dissipation capability, the projector comprising a projector housing and a screen frame housing arranged inside the projector housing, the screen frame housing being connected to a heat exchanger, and the two sides of the heat exchanger being respectively a secondary heat dissipation channel and a primary heat dissipation channel. The top of the primary heat dissipation channel is located in the same closed chamber through an air outlet and an air inlet of an internal circulation fan; the air outlet of the internal circulation fan is connected to one end of the internal circulation channel, the other end of the internal circulation channel is connected to the primary heat dissipation channel, and a display device connected to the primary heat dissipation channel is arranged inside, the display device is fixed through a card slot in the circulation channel, and together with the primary heat dissipation channel, forms a closed chamber; the card slot is provided with a convex piece and a heat-insulating glass in sequence along the left side with the display device as the center, and a convex piece and a Fresnel lens are arranged in sequence along the right side; the card slot passes through the display device body and forms a card slot top channel and a card slot bottom channel along the airflow direction, the card slot is provided with convex pieces on both the upper and lower surfaces, and the height of the convex piece is 1 / 6-1 / 3 of the height of the display device.

[0008] Fresnel lenses and heat-insulating glass are respectively arranged on both sides of the display device; together with the primary heat dissipation channel, they form a closed chamber; the inner circulation channel passes through the display device body and forms a top channel and a bottom channel along the airflow direction, and a convex piece is arranged on the channel surface, and the height of the convex piece is 1 / 6-1 / 3 of the height of the display device;

[0009] The secondary heat dissipation channel is connected and provided with an air inlet, and the other end is an air outlet and is located in the same chamber as the air inlet of the external circulation fan.

[0010] First, the internal circulation is used to dissipate the heat of the display device, and the heat exchange efficiency between the internal circulation airflow and the display device itself is improved through the design of the convex piece; the internal circulation is used to dissipate the heat of the display device, and the heat exchange power is 20 watts to 50 watts, which can meet the heat dissipation of the display device of 100 lumens to 500 lumens;

[0011] There are two types of heat dissipation in the industry. One is a closed cycle, and there is no suitable means to improve the heat dissipation capacity of the internal cycle, so its brightness and power cannot meet higher requirements; the other is a closed cycle, taking the patent CN201410400898.1 as an example of a projector air-cooled heat dissipation device, which combines the existing heat dissipation method to dissipate the heat of the display device and the light source. Similarly, the heat dissipation of a display device with a brightness of 100 lumens to 500 lumens requires a heat dissipation power of more than 150 watts to dissipate heat normally;

[0012] The height of the convex piece is 1 / 6 to 1 / 3 of the height of the display device. According to the measured data, under the premise of CFM=12, the upper limit of the display device temperature is 70 degrees, the width of the display device on both sides is within a space of 15mm, and the closed devices on both sides are non-heat-generating bodies, the actual data shows that the temperature rise is increased by 6 degrees Celsius when the bottom is increased by 1 / 5 of the height of the display device. The heat represented by this 6-degree increase is brought out by the airflow because of the improvement of heat exchange efficiency. This is beneficial to the heat exchange efficiency of the heat exchanger at the rear end.

[0013] The external circulation airflow first dissipates heat through the heat exchanger, and then passes through the heat exchanger, the external circulation fan and other radiators in sequence. The external circulation fan can improve the heat exchange efficiency on the heat exchanger and also dissipate the heat of the light source.

[0014] One end of the secondary heat dissipation channel is connected to the screen frame shell and is provided with an air inlet, and the other end is an air outlet and is located in the same chamber with the air inlet of the external circulation fan to form an external circulation; the hot air is discharged through the air outlet of the external circulation fan.

[0015] The heat-insulating glass and the Fresnel lens are arranged in the inner circulation channel opposite to the display device, thereby forming an optical path through which light can be transmitted for imaging, and sealing the inner circulation and outer circulation airflows.

[0016] The external circulation fan can be detachably connected to the projector housing, the number of which is greater than 1, or can be directly arranged inside the whole machine, the number of which is greater than or equal to 1. The main body of the external circulation fan bears the heat dissipation of the light source, etc., and the negative pressure generated by it is beneficial to the external circulation airflow of the heat exchanger and the heat dissipation of the secondary heat dissipation channel; it is used to increase the air flow rate of the external circulation and finally discharge the heat from the whole machine.

[0017] A dust screen is provided on the air inlet and is detachably installed to isolate external dust and further increase the service life of the device.

[0018] The inner circulation channel is connected to an arc-shaped ventilation section and a horizontal rectangular ventilation end, the arc-shaped ventilation section is connected to the air outlet of the inner circulation fan, and the horizontal rectangular ventilation end is connected to the heat dissipation channel. According to the principle of fluid mechanics, the inner circulation channel can be set as a compression expansion channel, so as to reduce the temperature of the airflow flowing through the display device and achieve a better heat exchange effect; it can also be set as a smooth channel of equal area to prevent the energy dissipation of the inner circulation heat dissipation airflow.

[0019] One end of the screen frame body that fixes the display device is connected to the primary heat dissipation channel, and a diverter is provided at the other end. The diverter is used to divide the internal circulation heat dissipation airflow; the shape of the diverter matches the shape of the arc-shaped ventilation section to achieve that during the flow, the area of ​​the air flow does not change, and the air compression or expansion does not occur. In order to better dissipate heat, the two sides should have the same outlet temperature after absorbing different amounts of heat. This is the most efficient. That is, the heat carried away by the airflow on both sides can be maximized, thereby reducing energy loss; at the same time, another aerodynamic principle can also be adopted to compress the air through the diverter, and then enter the heat dissipation channels on both sides of the display device, and then expand. During expansion, the airflow temperature drops, which is conducive to heat absorption. Both methods can be used after actual measurement.

[0020] Assume that the average temperature of the airflow on both sides is T1, the light-receiving side of the display device is the reverse side and its temperature is Tp, the temperature difference between the two sides of the display device is dT, and the light-emitting side is the front side and its temperature is Tp-dT. At the same time, based on the similar wind speeds and structural designs on both sides, and the same heat capacity coefficient of air, the heat capacity coefficient is assumed to be Re;

[0021] Assume that the airflow on both sides of the splitter is divided into X-light emitting surface airflow and Y-light receiving surface airflow. The airflows on both sides take away different amounts of heat, but can still maintain the same temperature difference. Then the heat taken away is Hx and Hy respectively:

[0022] Hx=X*Re*((Tp-T1)

[0023] Hy=Y*Re*(Tp-T1)From this, it can be concluded that the heat taken away on both sides is positively correlated only with the air flow rate;

[0024] Further calculation and analysis show that the difference in heat dissipation capacity on both sides is only positively correlated with the temperature difference between the temperature of the heating element on both sides and the temperature of the heat dissipation airflow, that is, the temperature difference; from this, the following formula is deduced:

[0025] X / Y=((Tp-dT)-T1) / (Tp-T1).

[0026] According to our actual application scenario, Tp is the temperature of the display device. According to the specifications and limiting conditions of the display device, this temperature is set to the normal working maximum temperature of the display device, which is usually 70 degrees. dT is the temperature difference on both sides of the display device. According to experimental data, at room temperature of 30 degrees, the total heat dissipation airflow CFM is 12. The empirical measured data under the usual structure shows that the temperature difference is about 12 degrees.

[0027] Combining the experience of different room temperatures, different display device specifications and other aspects, we can preliminarily use the common empirical temperature difference of 10 degrees as the basis for calculation. (Depending on different environments and different display devices, the temperature difference can be measured and is relatively stable). T1 is the average temperature of the flowing heat dissipation airflow. We use the weighted average temperature of the temperature entering the display device position and leaving the display device position as the average temperature of the airflow. According to the design logic of the present invention, we calculated and set that the temperature entering the display device position is 40 degrees and the temperature leaving the display device is 50 degrees, then the average temperature is 45 degrees. Thus, the data based on this setting logic is obtained:

[0028] X / Y=((70-10)-45) / (70-45)

[0029] X / Y=3 / 5

[0030] From this we can conclude that one implementation method under this scheme is:

[0031] When the display device temperature is 70 degrees, the air flow temperature out of the display device is 50 degrees, the air flow temperature into the display device is 40 degrees, and the temperature difference caused by the performance of the display device itself is 10 degrees, the splitter can divide the air flow blown out by the internal circulation cooling fan into 3:5, thus achieving the best heat dissipation effect.

[0032] Further analysis, based on actual test data, the temperature difference of different display devices, and the operating temperature settings of different display devices, can use the formula X / Y=((Tp-dT)-T1) / (Tp-T1) to easily and quickly set the diversion ratio of the diverter to the airflow.

[0033] At the same time, further analysis also provides us with a simple method based on this logic to test and determine the airflow distribution ratio. Measure the temperature at the air outlet of the light-receiving surface and the air outlet of the light-emitting surface of the display device. By adjusting the airflow ratio of the diverter plate to divert the airflow on both sides of the display device until the temperature of the circulating airflow on both sides is consistent after leaving the display device, the diverter plate has reached the optimal ratio of the airflow to the light-receiving surface and the light-emitting surface.

[0034] A heat exchange surface is provided between the primary heat dissipation channel and the secondary heat dissipation channel. The screen frame housing has an outlet end at the end where the internal circulating airflow leaves the display device. At this end, there is a larger area relative to the outlet connected to the heat exchanger. According to the relevant principles of heat conduction, a larger contact area can transfer heat to the main heat exchanger more quickly.

[0035] The outer wall of the screen frame shell and the outer wall of the inner circulation channel are both provided with heat dissipation fins; the heat dissipation fins can improve the heat exchange efficiency, preferably arc-shaped heat dissipation fins, and the heat dissipation fins can be detachably installed. The screen frame shell is made of a high thermal conductivity material, and the setting of the heat dissipation fins increases the ventilation area and can enhance the heat exchange efficiency. The high thermal conductivity material is made of metal, or alloys such as zinc alloy and aluminum alloy.

[0036] The inner circulation channel is located at the display device and is provided with an upper cover or a bottom cover that is movably connected. For the convenience of structural design and maintenance of the liquid crystal screen, the top channel or the bottom channel surrounding the display device can be split to form an independent upper cover or a bottom cover.

[0037] The display device adopts a liquid crystal screen.

[0038] The screen frame shell is treated with sandblasting technology inside, and then one or more layers of heat dissipation paint are provided. The inner and outer surfaces of the screen frame shell are treated with certain specific treatments to improve the surface heat exchange coefficient, which is conducive to airflow to take away the heat generated by the LCD screen.

[0039] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0040] 1. The height of the convex piece is 1 / 6 to 1 / 3 of the height of the display device. According to the measured data, under the premise of CFM=12, the upper limit of the LCD screen temperature is 70 degrees, the width of the two sides of the LCD screen is within 15mm, and the closed devices on both sides are non-heating bodies, the actual data is that the temperature rise is increased by 6 degrees Celsius when the bottom is increased by 1 / 5 of the LCD screen height. The heat represented by this 6-degree increase is brought out by the airflow because of the improvement of heat exchange efficiency. This is beneficial to the heat exchange efficiency of the heat exchanger at the rear end.

[0041] 2. The screen frame shell is made of high thermal conductivity material, and the setting of heat dissipation fins increases the ventilation area and enhances the heat exchange efficiency.

[0042] 3. The internal circulation channel is set as a compression-expansion channel according to basic mechanical principles, thereby reducing the temperature of the air flow passing through the display device and achieving a better heat exchange effect.

[0043] 4. Set a diverter with the same curvature as the arc-shaped ventilation section. The shape of the diverter matches the shape of the arc-shaped ventilation section, so that the air flow area does not change during the flow process, and the air is not compressed or expanded, achieving better heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative work, among which:

[0045] Figure 1 It is a schematic diagram of the structure of the present invention;

[0046] Figure 2 is an exploded view of the card slot of the present invention;

[0047] Figure 3 It is a front view of the card slot of the present invention.

[0048] Markings in the figure: 1-screen frame shell, 2-internal circulation fan, 3-internal circulation channel, 4-diverter, 5-convex piece, 6-insulating glass, 7-heat dissipation fins, 8-external circulation fan, 9-Fresnel lens, 10-display device, 11-dust screen, 12-air inlet, 13-secondary heat dissipation channel, 14-primary heat dissipation channel, 15-heat exchanger, 16-projector shell, 17-card slot DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0051] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] A projector with a screen frame having high heat dissipation capability, the projector comprises a projector housing 16 and a screen frame housing 1 arranged inside the projector housing 16, the screen frame housing 1 is connected to a heat exchanger 15, and the two sides of the heat exchanger 15 are respectively a secondary heat dissipation channel 13 and a primary heat dissipation channel 14. The top of the primary heat dissipation channel 14 is located in the same closed chamber with the air inlet of the internal circulation fan 2 through the air outlet; the air outlet of the internal circulation fan 2 is connected to one end of the internal circulation channel 3, and the other end of the internal circulation channel 3 is connected to the primary heat dissipation channel 14, and a display device 10 connected to the primary heat dissipation channel 14 is arranged inside, and the display device 10 is fixed through the card slot 17 in the circulation channel 3, and together with the primary heat dissipation channel 14, a closed chamber is formed; the card slot 17 is centered on the display device 10, and a convex piece 5 and a heat-insulating glass 6 are arranged in sequence along the left side, and a convex piece 5 and a Fresnel lens 9 are arranged in sequence along the right side; the card slot 17 passes through the display device 10 body and forms a top channel of the card slot 17 and a bottom channel of the card slot 17 along the flow direction of the airflow, and the convex piece 5 is arranged on the upper and lower surfaces of the card slot 17, and the height of the convex piece 5 is 1 / 6-1 / 3 of the height of the display device 10; the secondary heat dissipation channel 13 is connected and arranged with the air inlet 12, and the other end is the air outlet and is located in the same chamber with the air inlet of the external circulation fan 8.

[0053] When working: firstly, the internal circulation is used to dissipate the heat of the display device 10, and the heat exchange efficiency between the internal circulation airflow and the display device 10 itself is improved by the design of the convex piece 5; the internal circulation is used to dissipate the heat of the display device 10, and the heat exchange power is 20 watts to 50 watts, which can meet the heat dissipation of the display device 10 of 100 lumens to 500 lumens;

[0054] The height of the convex piece 5 is 1 / 6 to 1 / 3 of the height of the display device 10. According to the measured data, under the premise that CFM=12, the temperature of the display device 10 is 70 degrees as the upper limit, the width of the display device 10 on both sides is within a space of 15mm, and the closed devices on both sides are non-heat-generating bodies, the actual data is that the temperature rise is increased by 6 degrees Celsius, which is equivalent to the heat represented by this 6-degree increase, which is brought out by the airflow due to the improvement of heat exchange efficiency. This is beneficial to the heat exchange efficiency of the heat exchanger 15 at the rear end.

[0055] The external circulation airflow first dissipates heat through the heat exchanger 15, and then passes through the heat exchanger 15, the external circulation fan 8 and other radiators in sequence. The external circulation fan 8 can improve the heat exchange efficiency on the heat exchanger 15 and also dissipate the heat of the light source.

[0056] One end of the secondary heat dissipation channel 13 is connected to the screen frame shell 1 and is provided with an air inlet 12, and the other end is an air outlet located in the same chamber as the air inlet of the external circulation fan 8 to form an external circulation; the hot air is discharged through the air outlet of the external circulation fan 8.

[0057] The heat-insulating glass 6 and the Fresnel lens 9 are arranged in the inner circulation channel opposite to the display device 10, thereby forming an optical path through which light can be transmitted for imaging, and sealing the inner circulation and outer circulation airflows.

[0058] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0059] Embodiment 1

[0060] A preferred embodiment of the present invention provides a projector with a screen frame having high heat dissipation capacity, wherein the external circulation fan 8 is detachably connected to the projector housing, and the number is greater than 1. A dust screen 11 is provided on the air inlet 12. The arc-shaped ventilation section and the horizontal rectangular ventilation end of the internal circulation channel 3 are connected to each other, the arc-shaped ventilation section is connected to the air outlet of the internal circulation fan 2, and the horizontal rectangular ventilation end is connected to the primary heat dissipation channel 14. One end of the display device 10 is connected to the primary heat dissipation channel 14, and the other end is provided with a diverter 4.

[0061] During operation: the internal circulation channel can be set as a compression-expansion channel according to the principles of fluid mechanics, thereby reducing the temperature of the air flow passing through the display device 10 and achieving a better heat exchange effect; it can also be set as a smooth channel of equal area to prevent energy dissipation of the internal circulation heat dissipation air flow.

[0062] One end of the screen frame body of the fixed display device 10 is connected to the primary heat dissipation channel 14, and the other end is provided with a diverter 4. The diverter 4 is used to divide the internal circulation heat dissipation airflow; the shape of the diverter 4 matches the shape of the arc-shaped ventilation section to achieve that during the flow process, the area of ​​the air flow does not change, and the air compression or expansion does not occur. In order to better dissipate heat, the two sides should have the same outlet temperature after absorbing different amounts of heat. This is the most efficient. That is, the heat carried away by the airflow on both sides can be maximized, thereby reducing energy loss; at the same time, another aerodynamic principle can also be adopted to compress the air through the diverter 4, and then enter the heat dissipation channels on both sides of the display device 10, and then expand. During expansion, the airflow temperature drops, which is conducive to heat absorption. Both methods can be used after actual measurement.

[0063] Assume that the average temperature of the airflow on both sides is T1, the light receiving surface of the display device 10 is the reverse side and its temperature is Tp, the temperature difference between the two sides of the display device 10 is dT, and the light emitting surface is the front side and its temperature is Tp-dT. At the same time, based on the similar wind speeds and structural designs on both sides, and the same heat capacity coefficient of air, the heat capacity coefficient is assumed to be Re;

[0064] Assume that the airflow on both sides of the splitter 4 is divided into X-light emitting surface airflow and Y-light receiving surface airflow. The airflows on both sides take away different amounts of heat, but can still maintain the same temperature difference. Then the heat taken away is Hx and Hy respectively:

[0065] Hx=X*Re*((Tp-T1)

[0066] Hy=Y*Re*(Tp-T1)From this, it can be concluded that the heat taken away on both sides is positively correlated only with the air flow rate;

[0067] Further calculation and analysis show that the difference in heat dissipation capacity on both sides is only positively correlated with the temperature difference between the temperature of the heating element on both sides and the temperature of the heat dissipation airflow, that is, the temperature difference; from this, the following formula is deduced:

[0068] X / Y=((Tp-dT)-T1) / (Tp-T1).

[0069] According to our actual application scenario, Tp is the temperature of the display device 10. According to the display device specifications and limiting conditions, this temperature is set to the normal working maximum temperature of the display device 10, which is usually 70 degrees. dT is the temperature difference between the two sides of the display device 10. According to experimental data, at room temperature of 30 degrees, the total heat dissipation airflow flow CFM is 12. According to empirical measured data under normal structures, the temperature difference is about 12 degrees.

[0070] Combining the experience of different room temperatures, different display device 10 specifications and other aspects, we can preliminarily use the common empirical temperature difference of 10 degrees as the basis for calculation. T1 is the average temperature of the flowing heat dissipation airflow. We use the weighted average temperature of the temperature entering the display device 10 and leaving the display device 10 as the average temperature of the airflow. According to the design logic of the present invention, we calculated and set that the temperature entering the display device 10 is 40 degrees and the temperature leaving the display device 10 is 50 degrees, then the average temperature is 45 degrees. Therefore, the data based on this setting logic is obtained:

[0071] X / Y=((70-10)-45) / (70-45)

[0072] X / Y=3 / 5

[0073] From this we can conclude that one implementation method under this scheme is:

[0074] When the display device 10 operates at a temperature of 70 degrees, the air flow temperature out of the display device 10 is 50 degrees, the air flow temperature into the display device 10 is 40 degrees, and the temperature difference caused by the performance of the display device 10 itself is 10 degrees, the diverter 4 can divide the air flow blown out by the internal circulation cooling fan 1 into 3:5, thereby achieving the best heat dissipation effect.

[0075] Further analysis, based on actual test data, and the temperature difference of different display devices 10, as well as the operating temperature settings of different display devices 10, can use the formula X / Y=((Tp-dT)-T1) / (Tp-T1) to simply and quickly set the diversion ratio of the diverter plate 4 to the airflow.

[0076] At the same time, further analysis also provides us with a simple method based on this logic to test and determine the airflow distribution ratio. The temperature is measured at the air outlet of the light-receiving surface and the air outlet of the light-emitting surface of the display device 10. The airflow ratio on both sides of the display device 10 is adjusted by the diverter plate until the temperature of the circulating airflow on both sides is consistent after leaving the display device. At this time, the diverter plate 4 has reached the optimal ratio of dividing the airflow into the light-receiving surface and the light-emitting surface airflow.

[0077] Embodiment 2

[0078] This embodiment is based on the first embodiment, further: the inner wall of the screen frame housing 1, the inner circulation channel 3 and the outer wall are provided with heat dissipation fins 7. The display device 10 is a liquid crystal screen. The inner circulation channel 3 is provided with an upper cover or a bottom cover that is movably connected at the display device 10. The interior of the screen frame housing 1 is treated by sandblasting process, and one or more layers of heat dissipation paint are provided.

[0079] During operation: the heat sink fins 7 are detachable arc-shaped heat sink fins to increase the ventilation area and achieve better heat exchange. The top or bottom structure of the LCD screen can be split to form an independent upper cover, which is sealed and fixed on the main structure to facilitate the maintenance of the LCD screen.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A projector with a screen frame having high heat dissipation capability, characterized in that: The projector comprises a projector housing (16) and a screen frame housing (1) arranged inside the projector housing (16), the screen frame housing (1) being connected to a heat exchanger (15), and the two sides of the heat exchanger (15) are respectively a secondary heat dissipation channel (13) and a primary heat dissipation channel (14); the top of the primary heat dissipation channel (14) is located in the same closed chamber as the air inlet of the internal circulation fan (2) through an air outlet; the air outlet of the internal circulation fan (2) is connected to one end of the internal circulation channel (3), the other end of the internal circulation channel (3) is connected to the primary heat dissipation channel (14), and a display device (10) connected to the primary heat dissipation channel (14) is arranged inside; the display device (10) is fixed through a card slot (17) in the circulation channel (3), and is connected to a The card slot (17) is provided with a convex piece (5) and a heat-insulating glass (6) in sequence along the left side with the display device (10) as the center, and a convex piece (5) and a Fresnel lens (9) are provided in sequence along the right side; the card slot (17) passes through the display device (10) body and forms a card slot (17) top channel and a card slot (17) bottom channel along the airflow direction; the convex piece (5) is provided on the upper and lower surfaces of the card slot (17), and the height of the convex piece (5) is 1 / 6-1 / 3 of the height of the display device (10); the secondary heat dissipation channel (13) is connected to and provided with an air inlet (12), and the other end is an air outlet and is located in the same chamber as the air inlet of the external circulation fan (8); One end of the display device (10) is connected to the primary heat dissipation channel (14), and the other end is provided with a diverter plate (4); the diverter plate (4) has a diverting ratio for the airflow as follows: ； Among them, X represents the airflow on the light-emitting side, and Y represents the airflow on the light-receiving side. Indicates the temperature of the display device. Indicates the temperature difference on both sides of the display device, Indicates the average temperature of the flowing cooling airflow.

2. A projector with a screen frame having high heat dissipation capability according to claim 1, characterized in that: The external circulation fan (8) is detachably connected to the projector housing, and the number of the external circulation fan (8) is greater than one.

3. The projector with a screen frame having high heat dissipation capability according to claim 1, characterized in that: A dustproof net (11) is provided on the air inlet (12).

4. The projector with a screen frame having high heat dissipation capability according to claim 1, characterized in that: The inner circulation channel (3) has arc-shaped ventilation sections and horizontal rectangular ventilation ends connected to each other, the arc-shaped ventilation sections are connected to the air outlet of the inner circulation fan (2), and the horizontal rectangular ventilation ends are connected to the stage heat dissipation channel (14).

5. The projector with a screen frame having high heat dissipation capability according to claim 1, characterized in that: The inner wall of the screen frame shell (1) and the outer wall of the inner circulation channel (3) are both provided with heat dissipation fins (7).

6. The projector with a screen frame having high heat dissipation capability according to claim 1, characterized in that: The display device (10) adopts a liquid crystal screen.

7. The device according to claim 1, characterized in that: The inner circulation channel (3) is located at the display device (10) and is provided with an upper cover or a bottom cover which is movably connected.

8. The device according to claim 1, characterized in that: The interior of the screen frame shell (1) is treated by sandblasting and then provided with one or more layers of heat dissipation coating.

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