The present application is based on, and claims priority from, Taiwan Application Serial Number 93132801, filed Oct. 28, 2004, the disclosure of which is hereby incorporated by reference herein in its entirety.
1. Field of Invention
The invention relates to a cooling apparatus and, in particular, to a cooling apparatus with a mesh structure.
2. Description of Related Art
Since hot air rises, the temperature on the upper surface of a projector lampwick is greater than that on its lower surface. Thus, the cooling apparatus of the lampwick has to be designed according to different temperatures on its upper and lower surfaces. For example, the temperature of the upper surface is controlled not to exceed 100° C. while that on the lower surface not to go below 880° C. Thus, the temperature difference between the upper and lower surfaces of the lampwick is better to be controlled within 120° C. However, the temperature difference is not easy to control. If they are cooled under the same cooling conditions, it is very hard to satisfy the desired temperature requirements. This will directly affect the performance and lifetime of the lampwick. Moreover, some projectors are not only designed to be used on planar tables, but also hung on the ceiling at places of limited space. If one adopts the design that the outlet of the cooling apparatus faces the upper surface of the lampwick in its planar position, the temperature drop on the lower surface of the lampwick will be greater than that on the upper surface when the projector is hung up side down. This affects the performance and the lifetime of the lampwick.
Therefore, an objective of the invention is to provide a cooling apparatus with a mesh structure to provide the upper and lower surfaces of a lampwick with different cooling conditions so as to satisfy different requirements.
Another objective of the invention is to provide a cooling apparatus with a mesh structure so that the temperature difference between the upper and lower surfaces of a lampwick when the projector is hung up side down is that same as when it is disposed on a plane.
To achieve the above objective, the disclosed cooling device with a mesh structure contains a blower and an adjustable air duct, which is disposed at an outlet of the blower. The adjustable air duct contains an air duct portion, a guiding portion, and a mesh structure. The blower sends cooling air to the air duct portion and, through the guidance of which, to the lampwick inside a lampshade. The air duct portion contains a square outlet. The air duct portion can be directly formed on or coupled to the blower. The outlet of the air duct portion faces the inside of the lampshade. The guiding portion is configured at the outlet. The size of the mesh structure is about 30%˜70% of the outlet area. The mesh structure is coupled to the guiding portion in an adjustable way and slides along the guiding portion. The mesh structure couples to the guiding portion to move a lower portion of the guiding portion by gravity so that most part of the cooling air is blown to the lampwick through an upper portion of the guiding portion.
When the projector is in a planar position, most of the cooling air is blown to the upper surface of the lampwick through the upper portion of the guiding portion. Less cooling air is flown to the lower surface of the lampwick due to the blocking of the mesh structure in the lower portion of the guiding portion. Therefore, the upper and lower surfaces of the lampwick are under different cooling conditions in order to satisfy different requirements.
When the projector is hung up side down, the mesh structure falls to the lower portion of the outlet due to the force of gravity. Therefore, the temperature difference between the upper and lower surfaces of the lampwick still remains the same as the planar configuration.
These and other features, aspects and advantages of the invention will become apparent by reference to the following description and accompanying drawings which are given by way of illustration only, and thus are not limitative of the invention, and wherein:
The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
As shown in
As shown in
Various kinds of modifications can be made within the scope of the invention. For example, the shape of the openings on the mesh structure 310 can be square, as in
Therefore, one sees from the above-mentioned preferred embodiment that the invention has the following advantages:
1. The disclosed cooling apparatus with a mesh structure allows most of the cooling air to pass through an upper portion of the outlet of an air duct portion to cool the upper surface of the lampwick. The lower portion of the outlet is blocked by a mesh structure to allow less cooling air to flow through to cool the lower surface of the lampwick. The upper and lower surfaces of the lampwick are thus under different cooling conditions. This can maintain the performance of the lampwick and elongate its lifetime.
2. When a projector using the disclosed cooling apparatus with a mesh structure is hung up side down, the temperature different between the upper and lower surfaces of the lampwick can still remain the same as the planar position.
Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.
Number | Date | Country | Kind |
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93132801 A | Oct 2004 | TW | national |
Number | Name | Date | Kind |
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4538362 | Andis | Sep 1985 | A |
6641267 | Ohishi et al. | Nov 2003 | B2 |
Number | Date | Country | |
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20060093474 A1 | May 2006 | US |