1. Technical Field
The present disclosure relates to light emitting diode (LED) lamps and, more particularly, to an LED lamp having a good hermetical performance.
2. Description of Related Art
LEDs, available since the early 1960's and because of their high light-emitting efficiency, have been increasingly used in a variety of occasions, such as residential, traffic, commercial, and industrial occasions. For some type lamps, particularly those used in outdoors, good hermetical performance is required for insuring normal operation of the lamps. However, the sealing of the conventional lamps is generally unsatisfied such that dust or moisture in the surrounding environment may enter the lamps, causing reduction in brightness or even malfunction of the lamps.
What is needed, therefore, is an LED lamp having good sealing performance which can overcome the limitations described above.
Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Referring to
Also referring to
The enclosure 20 has an annular second groove 226 defined in a top thereof. Different from the first groove 224 communicating with lower chamber 222, the second groove 226 is spaced from the upper chamber 220 by an inner wall (not labeled) of the enclosure 20. The second groove 226 has a diameter larger than that of the first groove 224 to receive a second gasket 72 larger than the first gasket 70 therein. With the second gasket 72 placed therebetween, the cover 40 and the enclosure 20 are thus hermetically connected. The LED module 30 includes a circular printed circuit board 32, multiple LEDs 34 mounted on a top of the printed circuit board 32 and multiple lenses 36 covering the LEDs 34, respectively (see
The cover 40 is made of transparent material such as glass or plastic. The cover 40 has a circular shape with a diameter thereof larger than that of the second gasket 72 and less than that of a top the enclosure 20. The bracket 50 includes an inner annulus 52, an outer annulus 56 coaxial with the inner annulus 52 and four beams 54 interconnecting the inner annulus 52 and the outer annulus 56. The outer annulus 56 has a height equal to that of the beams 54 and larger than that of the inner annulus 52. Each beam 54 is fixed on a corresponding block 29 of the enclosure 20 by a screw 62 such that the outer annulus 56 is secured on an outer periphery of the top of the enclosure 20 and the inner annulus 52 is driven to press downwardly a periphery of the cover 40, thereby securing the cover 40 on the enclosure 20. A third gasket 90 is provided between the cover 40 and the inner annulus 52 of the bracket 50, functioning as a cushion to relieve pressure produced by the bracket 50 to the cover 40 and a sealer to enhance a hermetical connection between the cover 40 and the bracket 50 thereby further preventing moisture and dust from entering the upper chamber 220.
Since an interface between the base 14 and the bottom of the enclosure 20 and an interface between the cover 40 and the top of the enclosure 20 are both provided with the gaskets 70, 72, the upper and the lower chamber 220, 222 in the enclosure 20 are thus hermetically isolated from an outside environment of the LED lamp, and the LED module 30 and the driving module 80 can accordingly be sealed from the influence by the outside environment, i.e. the dust and moisture or other foreign matter in the outside environment. Thus, the LED module 30 and the driving module 80 can work normally even after a long period of use of the LED lamp in the outside environment.
It is believed that the present disclosure and its advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the present disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments.
Number | Date | Country | Kind |
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200910310137.6 | Nov 2009 | CN | national |