CN100390661C - Projection heat dissipation device - Google Patents

Abstract

A projection heat dissipation device comprises a first cooling path, which has a temperature sensing element and an exhaust fan, which are respectively arranged at the inlet and outlet ends of the cooling path; and a second cooling path, which has a temperature sensing element, a power supply unit and a guide fan; when the ambient temperature changes or different voltages are input, the temperature sensing elements arranged on the first and second cooling paths can respectively and instantly adjust the rotation speeds of the two sets of fans according to the detected temperature to obtain the best cooling effect, prevent noise and extend the service life of the fans.

Description

Projection cooling device

technical field

The invention relates to a heat dissipation device, in particular to a heat dissipation device used in a projection display device.

Background technique

Due to the high image quality and convenience of the projection display device, the projection display device is becoming more and more popular all over the world; about 75% of the main heat of the general projection display device comes from the bulb, and 25% comes from the power supply unit.

The known projection display device 10 mainly includes a light bulb 11, an optical engine 12, a power supply unit 13 and a heat dissipation device 14, wherein the heat dissipation device 14 utilizes a fan 141 and configures several air deflectors 142A, 142B, 142C to provide The cooling air flow is directed to the light bulb 11, the optical engine 12 and the power supply unit 13 in sequence, but the light bulb 11 farther away from the fan 141 has a long cooling path, which causes cooling energy loss, while the light engine 12 and the power supply adjacent to the fan 141 The cooling effect of the supply unit 13 is limited due to poor design of the light guide plates 142A and 142C. In addition, due to the difference in the standard input voltage value (AC) of each country, the heat energy generated by each power element in the power supply unit 13 (for example: the power factors of resistors, capacitors, diodes, coils, etc. will change accordingly) will be reduced accordingly. Or rise, causing the temperature difference of each element in the projection display device, so the known projection display device cannot achieve the best heat dissipation effect through a single heat dissipation device 14 .

At the same time, the cooling device used in the known projection display device cannot adjust the speed of the fan in a timely manner according to the change of the input voltage value, so not only cannot achieve the function of cooling the power supply unit 13 in real time, but also cannot respond to the differences in input voltage or operating environment temperature in various places. , Instantly adjust the fan speed to achieve the best cooling effect.

Contents of the invention

An object of the present invention is to provide a projection cooling device, which can individually control the cooling device through different temperature detection points, so as to timely improve the cooling effect.

Another object of the present invention is to provide a projection cooling device, which provides the most appropriate air volume requirement for heating elements by adjusting the fan speed in real time, avoiding long-term operation of the fan at high speed, so as to improve the service life of the fan and prevent noise.

To achieve the above object, the projection cooling device of the present invention includes a first cooling path, which has a temperature sensing element, and an exhaust fan respectively arranged at the inlet and outlet ends of the cooling path; and a second cooling path, which has A temperature sensing element, a power supply unit, and a guide fan; when the ambient temperature changes or different voltages are input, the temperature sensing elements set on the first and second cooling paths can be adjusted in real time according to the detected temperature. Set the speed of the fan to get the best cooling effect, prevent noise and prolong the life of the fan.

Description of drawings

FIG. 1 shows a structural diagram of a known projection display device;

Fig. 2 shows the schematic diagram of projection cooling device of the present invention;

FIG. 3 shows a schematic diagram of the projection cooling device of the present invention.

Detailed ways

In order to achieve the above-mentioned purpose, the technical means adopted and their effects are described as follows with reference to preferred embodiments and accompanying drawings.

Referring to FIG. 2 , the projection display device 20 of the present invention mainly includes a power supply unit 24 consisting of a heat sink 21 , a light bulb 22 , an optical engine 23 and a low voltage power supply (LVPS) 241 and a ballast (Ballast) 242 , wherein the optical engine 23 and the power supply unit 24 are separated by a partition 25 .

Referring to Fig. 3, the cooling device 21 of the present invention mainly includes two temperature sensing elements 211A, 211B, two guide fans 212A, 212B and two exhaust fans 213A, 213B; wherein the first temperature sensing element 211A is arranged on Near the air inlet of the optical engine 23, the temperature of the air entering the projection display device 20 is detected. After the introduced air flows through the optical engine 23, part of the air is sucked by the first guide fan 212A and flows through the rear side of the bulb 22, and then by the second guide fan 212A. An exhaust fan 213A discharges the projection display device 20 to form a first cooling path 26; in addition, the air inlet near one end of the power supply unit 24, the air flow introduced sequentially passes through the low voltage power supply (LVPS) 241 of the power supply unit 24 After the ballast 242, it is drawn by the second guide fan 212B located at the other end of the power supply unit 24, flows through the inside and front side of the bulb 22, and finally the air is exhausted from the projection display device 20 by the second exhaust fan 213B , and a second temperature sensing element 211B is provided between the second guiding fan 212B and the power supply unit 24 to form the second cooling path 27 .

The heat dissipation device 21 of the present invention is located at the first temperature sensing element 211A at the entrance of the first cooling path 26. According to the ambient temperature detected by the air inlet to sufficiently cool the optical engine 23 and the light bulb 22, the guide fan 212A and the exhaust fan 213A are adjusted in real time. , 213B, so that the overall projection display device, that is, the first and second cooling paths 26, 27 can obtain an appropriate amount of cooling air, so as to appropriately increase or decrease the fan speed according to the change of the ambient temperature, so as to avoid the fan from being too high Continuous operation at a high speed reduces the life of the fan and reduces noise, or low speed operation leads to poor heat dissipation of the projection display device, which affects the efficiency of optical components and reduces projection quality. Furthermore, setting the first temperature sensing element 211A at the air inlet can also prevent the temperature sensing element 211A from being disturbed by the temperature change of the projection display device, so as to detect the correct ambient temperature change; in addition, when the voltage input terminal 28 inputs different When the temperature of the low-voltage power supply 241 and the ballast 242 decreases or increases, the second temperature sensing element 211B can adjust the speed of the second guide fan 212B independently and in real time according to the detected temperature, so that the low-voltage power supply The supplier 241 and the ballast 242 are properly cooled in a timely manner without affecting the speed of other fans, thus avoiding the unnecessary increase of the speed of other fans and reducing the life of the fan, reducing noise, or reducing the speed of the projection display device to cause poor heat dissipation, thereby Decreases projection quality.

The above description is only for the convenience of describing the preferred embodiments of the present invention, and the scope of the present invention is not limited to the preferred embodiments. Any changes made according to the present invention belong to the present invention without departing from the essence of the present invention. scope of claims.

Claims (6)

1. A projection cooling device, comprising: The first cooling path is provided with a temperature sensing element at its inlet end and an exhaust fan at its outlet end; an optical engine located on the first cooling path; a second cooling path with a guide fan and a temperature sensing element therebetween; and a power supply unit located on the second cooling path, Wherein the temperature sensing element of the second cooling path is arranged between the guide fan and the power supply unit. 2. The projection cooling device according to claim 1, wherein the first cooling path further comprises a light bulb and a guide fan, and the guide fan draws part of the air to cool the light bulb. 3. The projection cooling device according to claim 1, wherein the power supply unit comprises a low voltage power supply and a ballast. 4. The projection cooling device according to claim 1, wherein the second cooling path further comprises a light bulb and an exhaust fan, the exhaust fan is arranged at the outlet end of the second cooling path, and the light bulb is arranged at the guide fan and the exhaust fan. between the fans. 5. The projection cooling device according to claim 4, wherein according to the temperature detected by the temperature sensing element of the first cooling path, the exhaust fan of the first cooling path, the guide fan and the exhaust fan of the second cooling path are controlled and adjusted and so on. 6 . The projection cooling device according to claim 1 , wherein according to the temperature detected by the temperature sensing element of the second cooling path, the rotational speed of the guide fan of the second cooling path is controlled and adjusted.

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