Patent Application
20100295436
1. Field of the Invention
The present invention relates to a lamp and, more particularly, to a lamp providing a self-heat-dissipating function.
2. Description of the Related Art
In use, the electrically connected portion 912 is coupled to a socket on a wall, a ceiling or a table (not illustrated) for being supplied with electricity so that the light emitter 92 can emit light passing through the light-transparent portion 911 to the environment. Besides, while the light emitter 92 is supplied with electricity generates undesired heat, air is drawn into an interior of the housing from an exterior thereof to form airflow “A” via the air inlet portion 913, passes through the gaps between any two adjacent fins 931, and then is exhausted back to the exterior via the air outlet portion 914. Thereby, through the heat conducting effect of fins 931 of the heat sink 93 cooperating with the movement of the fan 94, the undesired heat is transferred to the environment by the air currents. Consequently, the conventional lamp device provides a heat-dissipating function and, thus, the life of the conventional lamp device is longer than those of lamps without a heat-dissipating function.
Referring again to
It is therefore the primary objective of this invention to provide a lamp device that overcomes the problems of the prior art described above to enhance heat-dissipating efficiency.
The present invention solves the problems in the field of lamp by providing, in a preferred form, a lamp includes a housing, a heat sink, a light emitter, a fan and a blocking ring. The housing includes an end forming a light-transparent portion and another end forming a base. The housing has an air inlet portion and an air outlet portion formed in a wall of the housing. The heat sink is mounted inside the housing and includes a base plate and a plurality of fins surrounding the base plate to define a compartment. The fins are close to the air outlet portion of the housing. Each of the fins have a first end facing the air inlet portion of the housing and a second end connecting with the base plate. The light emitter is fixed to the base plate of the heat sink. The light emitter faces the light-transparent portion of the housing and electrically connecting to the base of the housing. The fan is fixed inside the compartment of the heat sink. The blocking ring is mounted in the housing and positioned between the air inlet portion and the heat sink. A center hole of the blocking ring is aligned with the compartment of the heat sink. Accordingly, the blocking ring blocks part of the heated airflow from flowing back to the air inlet portion and turbulence is avoided effectively. Therefore, the airflow inside the housing can flow smoothly through the air outlet to transfer heat to the environment and heat dissipating efficiency is enhanced.
In an example, the blocking ring has an outer diameter larger than that of the heat sink, so that a gap formed between the inner periphery of the housing and the first end of each fin is reduced, and thus the heat-dissipating function is increased.
In another example, an outer edge of the blocking ring forms a flange extending in a direction from the first ends to the second ends of the fins so that the flange can fit the outer periphery of the heat sink close to the first ends of the fins, and thus the convenience for assembling the blocking ring and the heat sink is improved.
In a further example, the blocking ring has two sides respectively forming a first flange and a second flange, while the housing includes a first shell and a second shell assembled together. The first shell couples to the first flange and the second shell couples to the second flange. Accordingly, the blocking ring is sandwiched and fixed between the first and second shells, so that the blocking ring and the first and second shells are assembled firmly.
In still another example, there is a cushion mounted inside the compartment and the fan is fixed on the cushion, so that the vibration of the fan and the noise resulting from the vibration are reduced.
In still another example, the blocking ring has a side forming a protrusion ring extending to the light-transparent portion in an axial direction of the fan and overlapping a side of the fan in a radial direction of the fan. Accordingly, the protrusion ring prevents the airflow from exiting through the air outlet portion directly until the heat produced by the light emitter and conduced to the fins is fully absorbed by the airflow, so that the heat-dissipating function is increased.
In still another example, the blocking ring has an outer edge integrated into the inner periphery of the housing, so that the assembly convenience is increased.
Further scope of the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferable embodiments of the invention, are given by way of illustration only, since various will become apparent to those skilled in the art from this detailed description.
The illustrative embodiments may best be described by reference to the accompanying drawings where:
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
In the various figures of the drawings, the same numerals designate the same or similar parts. Furthermore, when the terms “first”, “second”, “axial”, “radial” and similar terms are used hereinafter, it should be understood that these terms are reference only to the structure shown in the drawings as it would appear to a person viewing the drawings and are utilized only to facilitate describing the invention.
A lamp of a first embodiment according to the preferred teachings of the present invention is shown in
The housing 1 can be formed with a single piece or two or more assembled pieces to provide a compartment receiving the heat sink 2, the light emitter 3, the fan 4 and the blocking ring 5. In the preferred form shown in
The heat sink 2 is mounted inside the housing 1 and made of heat conductive materials such as aluminum. The heat sink 2 includes a base plate 21 and a plurality of fins 22 surrounding the base plate 21 to define a compartment 23. The fins 22 are spaced apart with intervals and close to the air outlet portion 113 of the housing 1. Each of the fins 22 has a first end 221 facing the air inlet portion 123 of the housing 1 and a second end 222 connecting with the base plate 21. Parts of the fins 22 of the heat sink 2 have a plurality of positioning holes 223 on the first ends 221. Furthermore, parts of the fins 22, preferably other than the those with the positioning holes 223, have a plurality of through holes 224, each of which extends through one of the fins 22 from the first end 221 to the second end 222 thereof. Thereby, a plurality of first fixing members 24 such as screws, bolts or pins extends through the through holes 224, with each first fixing member 24 having an end fixed in an axial hole of each positioning protrusion 124 of the second shell 12, so that the heat sink 2 is firmly mounted inside the housing 1. Besides, there is preferably a cushion 25 mounted inside the compartment 23.
The light emitter 3 is preferably selected from a light-emitting diode (LED), a bulb or any other components that can emit light when supplied with electricity. The light emitter 3 is fixed to the base plate 21 of the heat sink 2 and faces the light-transparent portion 111 of the housing 1. By a plurality of wires (not illustrated), the light emitter 3 is electrically connected to the base 122 of the housing 1.
The fan 4 is fixed inside the compartment 23 of the heat sink 2 and is preferably fixed on the cushion 25. With the cushion 25, vibration produced by the fan 4 is reduced while the fan 4 turns, so that the noise resulted from the vibration is reduced as well.
The blocking ring 5 is mounted inside the housing 1 and positioned between the air inlet portion 123 and the heat sink 2. A center hole 51 of the blocking ring 5 is aligned with the compartment 23 of the heat sink 2. Furthermore, the blocking ring 5 has a plurality of first apertures 52 around the center hole 51 for the first fixing members 24 to extend through, while the blocking ring 5 further has a plurality of second apertures 53 around the center hole 51 for a plurality of second fixing members 54, such as screws, bolts or pins, to extend through. Each second fixing member 54 has an end fixed in each positioning hole 223 of the heat sink 2, so that the blocking ring is fixed to the heat sink 2 close to the first ends 221 of the fins 22. Besides, with reference to
In use, the base 122 can be coupled to a socket on a wall, a ceiling or a table to supply electricity to the light emitter 3. The light beams emitted from the light emitter 3 transmit through the light-transparent portion 111 to the environment. Moreover, the light-transparent portion 111 can be in various colors so that the lamp device can emit a colored light, e.g. green, yellow or red light. Furthermore, air is drawn by the fan 4 from the environment via the air inlet portion 123, passes through the center hole 51 of the blocking ring 5, further passes through gaps formed between any two adjacent fins 22, and then is exhausted back to the environment via the air outlet portion 113 so as to form airflow. Accordingly, the heat generated by the light emitter 3 can be transmitted to the fins 22 of the heat sink 2 and then be transferred to the environment by the airflow. Therefore, heat-dissipating effect is provided.
Referring again to
The blocking ring 8 in the fourth embodiment is distinguished from the blocking ring 5,6,7,7′ in the foregoing embodiments in that the blocking ring 8 is integrally formed on the inner periphery of the housing 1, that is the housing 1 and the blocking ring 8 are integrated. In the preferred form illustrated in
As has been discussed above, the lamp of the present invention provides the blocking rings 5, 6, 7,7′ and 8, which can block part of the heated airflow from flowing back to the air inlet portion 123, so that turbulence resulting from flowing back airflow is avoided. Consequently, the airflow propelled by the fan 4 can smoothly exit the housing 1 through the air outlet portion 113 to transfer the heat to the environment, and heat-dissipating efficiency of the heat sink 2 and the fan 4 is enhanced, so that the life of the light emitter 3 is extended.
Thus since the invention disclosed herein may be embodied in other specific forms without departing from the spirit or general characteristics thereof, some of which forms have been indicated, the embodiments described herein are to be considered in all respects illustrative and not restrictive. The scope of the invention is to be indicated by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.
