Efficient heat dissipation device and LCD projector

Abstract

The utility model discloses a high-efficiency heat dissipation device which is applied to a projector, the projector is provided with a light machine shell, a front Fresnel lens, an LCD light valve and a field lens, the front Fresnel lens, the LCD light valve and the field lens are located in the light machine shell and are sequentially arranged in the light advancing direction, and a first heat dissipation air channel is formed between the front Fresnel lens and the LCD light valve. A second heat dissipation air channel is formed between the LCD light valve and the field lens; the efficient heat dissipation device comprises an air blowing assembly and an exhaust fan, the air blowing assembly comprises a first air blower and a second air blower which are arranged in parallel, and the first air blower and the second air blower are turbine fans. The utility model further discloses an LCD projector which comprises the efficient heat dissipation device. According to the utility model, a heat dissipation mode that two parallel blowers blow air and one exhaust fan exhausts air is adopted, so that the heat dissipation effect of the LCD light valve is remarkable, and the output brightness of a projector is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of projection, in particular to a high-efficiency heat dissipation device and an LCD projector. Background Art

[0002] The transmission efficiency of the LCD light valve of the existing projector is usually only 4%-7%, and the transmittance is extremely low, so most of the illumination light is blocked and converted into Joule heat. The current LCD light valve usually uses air cooling for heat dissipation, and the larger the size of the fan that blows air to the LCD light valve, the better the indicators such as air volume and air pressure, and the better the heat dissipation effect. However, a large-sized fan usually significantly increases the size of the LCD projector to an outrageous degree. Therefore, it is now inclined to use two smaller-sized fans, which are arranged in parallel to blow air to the LCD light valve. This can control the size of the projector as much as possible, and to a certain extent can also directly reduce costs and improve cost performance. For example, CN2022217358470 discloses a dual-fan heat dissipation device for a projector LCD light valve, which uses dual fans arranged in parallel to blow air to the LCD light valve. However, due to the extremely low transmittance of the LCD light valve, the converted Joule heat is mainly concentrated in the heat dissipation channel formed by the front mirror and the LCD light valve, while the Joule heat in the heat dissipation channel formed by the LCD light valve and the field lens (rear mirror) is significantly less. However, since the two fans simultaneously blow air to the heat dissipation channel formed by the front mirror and the LCD light valve and the heat dissipation channel formed by the LCD light valve and the field lens, the wind force is dispersed, and the two fans themselves are small in size, and the wind force is obviously reduced compared to the large-size fans. Therefore, the Joule heat dissipation between the front mirror and the LCD light valve is limited, resulting in limited heat dissipation of the LCD light valve. In order to solve the above technical problems, the utility model provides a high-efficiency heat dissipation device and an LCD projector. The utility model adopts a heat dissipation method of two parallel hair dryers blowing air and one exhaust fan exhausting air, so that the heat dissipation effect of the LCD light valve is significant and the output brightness of the projector is greatly improved. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a high-efficiency heat dissipation device and an LCD projector. The utility model adopts a heat dissipation method of two parallel hair dryers blowing air and one exhaust fan exhausting air, so that the heat dissipation effect of the LCD light valve is significant, and the output brightness of the projector is greatly improved. At the same time, the exhaust fan also takes into account the heat dissipation of the radiator of the LED light source.

[0004] To achieve the above-mentioned purpose, the utility model provides a high-efficiency heat dissipation device, which is applied to a projector. The projector comprises an optical machine housing, and a front mirror, an LCD light valve and a field lens which are located in the optical machine housing and are arranged in sequence according to the direction of light travel. A first heat dissipation air duct is formed between the front mirror and the LCD light valve, and a second heat dissipation air duct is formed between the LCD light valve and the field lens. The high-efficiency heat dissipation device comprises a blowing assembly and an exhaust fan. The blowing assembly comprises a first blower and a second blower which are arranged in parallel, and both the first blower and the second blower are turbine blowers.

[0005] The blowing assembly and the exhaust fan are respectively located on two opposite sides of the light-transmitting window of the LCD light valve; the first blower and the second blower are aimed at the air inlet of the first heat dissipation air duct to blow air; the exhaust fan is aimed at the air outlet of the first heat dissipation air duct and the second heat dissipation air duct to exhaust air; the first blower and the second blower have opposite rotation directions, and when looking from the blowing assembly toward the direction of the LCD light valve, the first blower rotates counterclockwise, and the second blower rotates clockwise.

[0006] Furthermore, the air outlets of the first hair dryer and the second hair dryer are connected to the air inlet of the first heat dissipation air duct through a guide channel.

[0007] Preferably, the blowing assembly and the exhaust fan are respectively located on two opposite long sides of the light-transmitting window of the LCD light valve.

[0008] Preferably, the first hair dryer and the second hair dryer are of the same model and specification.

[0009] An LCD projector comprises the efficient heat dissipation device, an LED light source and a heat sink arranged in close contact with the LED light source, and the air outlet of the exhaust fan is aimed at the heat sink for blowing air.

[0010] Beneficial effects of the utility model:

[0011] 1. The utility model adopts a first blower and a second blower arranged in parallel to blow air to the first heat dissipation air duct formed between the front mirror and the LCD light valve. Under the action of the first blower and the second blower, the Joule heat between the front mirror and the LCD light valve is quickly dissipated. At the same time, an exhaust fan is used to exhaust air from the first heat dissipation air duct and the second heat dissipation channel at the same time. Under the combined action of the first blower, the second blower and the exhaust fan, the heat dissipation effect of the LCD light valve is significant, and the output brightness of the projector with a 4-inch LCD light valve can exceed 800 lumens, and the output brightness of the projector is greatly improved. At the same time, the exhaust fan of the utility model also takes into account the heat dissipation of the radiator of the LED light source.

[0012] 2. When the LCD light valve is working, the converted Joule heat is mainly concentrated in the center of the LCD light valve screen, and the temperature of the edge of the screen is quite low. The first blower and the second blower of the utility model rotate in opposite directions. Looking from the blowing component to the direction of the LCD light valve, the first blower rotates counterclockwise and the second blower rotates clockwise. Therefore, the wind blown by the first blower and the second blower is mainly concentrated in the center of the LCD light valve screen, which effectively reduces the temperature of the center of the LCD light valve screen and avoids the problem of uneven heat dissipation of the LCD light valve as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a three-dimensional diagram of the utility model;

[0015] Figure 2 For Figure 1 Partial cut diagram after partial sectioning;

[0016] Figure 3 It is a cross-sectional view of the first hair dryer and the second hair dryer of the utility model. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the utility model.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0019] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0020] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example:

[0023] See also Figure 1-3 As shown, a high-efficiency heat dissipation device provided in this embodiment is applied to a projector, wherein the projector comprises an optical machine housing 1, and a front mirror 5, an LCD light valve 6 and a field lens 7 which are located in the optical machine housing 1 and are arranged in sequence according to the direction of light travel, a first heat dissipation air duct is formed between the front mirror 5 and the LCD light valve 6, and a second heat dissipation air duct is formed between the LCD light valve 6 and the field lens 7; the high-efficiency heat dissipation device comprises a blowing assembly and an exhaust fan 4, the blowing assembly comprises a first blower 2 and a second blower 3 which are arranged in parallel, and both the first blower 2 and the second blower 3 are turbine fans.

[0024] In this embodiment, the blowing assembly and the exhaust fan 4 are respectively located on two opposite sides of the light transmission window of the LCD light valve 6. Figure 1 and 2 Taking the position shown as an example, the blowing assembly and the exhaust fan 4 are respectively located above and below the LCD light valve 6. The first blower 2 and the second blower 3 are aimed at the air inlet of the first heat dissipation air duct to blow air; the exhaust fan 4 is aimed at the air outlet of the first heat dissipation air duct and the second heat dissipation air duct to exhaust air.

[0025] In this embodiment, the first blower 2 and the second blower 3 arranged in parallel are used to blow air to the first heat dissipation air duct formed between the front mirror 5 and the LCD light valve 6. Under the action of the first blower 2 and the second blower 3, the Joule heat between the front mirror 5 and the LCD light valve 6 is quickly dissipated, and the heat dissipation efficiency of the LCD light valve 6 is high. At the same time, the exhaust fan 4 is used to exhaust air to the first heat dissipation air duct and the second heat dissipation air duct at the same time. Under the combined action of the first blower 2, the second blower 3 and the exhaust fan 4, the heat generated by the LCD light valve 6 can be quickly dissipated. The heat dissipation effect of the LCD light valve 6 is significant, and the output brightness of the projector with a 4-inch LCD light valve 6 can exceed 800 lumens. If a blower is used to dissipate heat for the LCD light valve 6, the output brightness of the projector with a 4-inch LCD light valve 6 is difficult to exceed 400 lumens. Therefore, the utility model adopts a heat dissipation method of two parallel blowers blowing air and one exhaust fan 4 exhausting air, so that the heat dissipation effect of the LCD light valve 6 is significant, and the output brightness of the projector is greatly improved.

[0026] When the LCD light valve 6 is working, the converted Joule heat is mainly concentrated in the center of the screen of the LCD light valve 6, and the temperature of the edge of the screen is quite low. In this embodiment, the first blower 2 and the second blower 3 rotate in opposite directions. Looking from the blowing assembly to the direction of the LCD light valve 6, the first blower 2 rotates counterclockwise, and the second blower 3 rotates clockwise. Figure 3 Sectional view( Figure 3 The arrow direction is the rotation direction of the first blower 2 and the second blower 5), so the wind blown by the first blower 2 and the second blower 3 is mainly concentrated in the center of the LCD light valve 6, which effectively reduces the temperature of the center of the LCD light valve 6 and avoids the problem of uneven heat dissipation of the LCD light valve 6 as a whole.

[0027] In this embodiment, the blowing assembly and the exhaust fan 4 are respectively located at two long sides opposite to the light transmission window of the LCD light valve 6. The air outlet sizes of the first blower 2 and the second blower 3 match the size of the long side of the LCD light valve 6.

[0028] In this embodiment, preferably, the first hair dryer 2 and the second hair dryer 3 have the same model and specification, that is, the first hair dryer 2 and the second hair dryer 3 have the same rotation speed. Figure 1 In the shown orientation, the air inlet of the first hair dryer 2 faces upward, and the air inlet of the second hair dryer 3 faces downward.

[0029] In this embodiment, the air outlets of the first blower 2 and the second blower 3 are preferably connected to the air inlet of the first heat dissipation air duct through the guide channel 8. The guide channel 8 is used to guide the first blower 2 and the second blower 3, thereby ensuring effective and rapid heat dissipation between the front mirror 5 and the LCD light valve 6.

[0030] An LCD projector includes the above-mentioned high-efficiency heat dissipation device, and also includes an LED light source 9 and a heat sink 10 arranged in close contact with the LED light source 9, and the air outlet of the exhaust fan 4 is aimed at the heat sink 10 for blowing air. Of course, the LCD projector also includes other existing structures such as a projection lens and a projector housing, which are not the focus of this embodiment, so they are not elaborated in detail. In this embodiment, the heat sink 10 is used to dissipate heat from the LED light source 9, and the air outlet of the exhaust fan 4 is aimed at the heat sink 10 for blowing air, so the exhaust fan 4 not only dissipates heat for the LCD light valve 6, but also dissipates heat for the heat sink 10 of the LED light source 9.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A high-efficiency heat dissipation device, applied to a projector, the projector comprising an optical machine housing (1), and a front mirror (5), an LCD light valve (6) and a field lens (7) located in the optical machine housing (1) and arranged in sequence according to the direction of light travel, a first heat dissipation air duct is formed between the front mirror (5) and the LCD light valve (6), and a second heat dissipation air duct is formed between the LCD light valve (6) and the field lens (7); characterized in that: The high-efficiency heat dissipation device comprises a blowing assembly and an exhaust fan (4), wherein the blowing assembly comprises a first blower (2) and a second blower (3) arranged in parallel, and both the first blower (2) and the second blower (3) are turbine blowers; The blowing assembly and the exhaust fan (4) are respectively located on two opposite sides of the light-transmitting window of the LCD light valve (6); the first blower (2) and the second blower (3) are aimed at the air inlet of the first heat dissipation air duct to blow air; the exhaust fan (4) is aimed at the air outlet of the first heat dissipation air duct and the second heat dissipation air duct to exhaust air; The first blower (2) and the second blower (3) rotate in opposite directions. When viewed from the blowing assembly toward the LCD light valve (6), the first blower (2) rotates counterclockwise, while the second blower (3) rotates clockwise.

2. The high-efficiency heat dissipation device according to claim 1, characterized in that: The air outlets of the first hair dryer (2) and the second hair dryer (3) are connected to the air inlet of the first heat dissipation air duct via a guide channel (8).

3. The high-efficiency heat dissipation device according to claim 1, characterized in that: The blowing assembly and the exhaust fan (4) are respectively located on two opposite long sides of the light-transmitting window of the LCD light valve (6).

4. The high-efficiency heat dissipation device according to claim 1, characterized in that: The first hair dryer (2) and the second hair dryer (3) are of the same model and specification.

5. An LCD projector, characterized in that: The invention comprises the high-efficiency heat dissipation device according to any one of claims 1 to 4, and further comprises an LED light source (9) and a heat sink (10) arranged in close contact with the LED light source (9), wherein the air outlet of the exhaust fan (4) is aimed at the heat sink (10) for blowing air.

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