CN201462748U

CN201462748U - LED down lamp

Info

Publication number: CN201462748U
Application number: CN2009201335670U
Authority: CN
Inventors: 周文立
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-03
Filing date: 2009-07-03
Publication date: 2010-05-12
Anticipated expiration: 2019-07-03

Abstract

The utility model discloses an LED down lamp which comprises an LED light source, a heat radiating baseplate and a heat radiating cylinder body, wherein the heat radiating baseplate is contained in the heat radiating cylinder body, and the LED light source is arranged at one side of the heat radiating baseplate. The heat radiating baseplate is used for connecting the outer ring surface of the heat radiating cylinder body, the heat radiating baseplate is placed inside for colling when the heat radiating cylinder body expands, and the inner wall of the heat radiating cylinder body shrinks and clings to the outer ring surface of the heat radiating baseplate, thereby establishing a smooth radiating passage between the heat radiating baseplate and the heat radiating cylinder body through the outer ring surface. The utility model changes traditional radiating point contact into surface contact, increases a heat radiating path, can rapidly guide heat flows and effectively reduces thermal impedance.

Description

A kind of LED Down lamp

Technical field

The utility model relates to lighting, is specifically related to a kind of LED Down lamp that improves radiating effect.

Background technology

Along with building decoration is laid the raising that requires to the inner space, the LED Down lamp also is used for increasing simultaneously the harmony of upholstery and light not only as the lighting that is embedded at ceiling.Only there is 15-20% to change into light but the 80-85% of its input power has changed into heat in LED (the Light Emitting Diode) light source.Therefore led light source is when work, and its chip all can produce a large amount of heats, if these heats are not in time exhaled, causes LED wafer interface temperature too high on the chip but accumulate in, and then directly influences the service life of luminous intensity and chip.Therefore, in the design of LED Down lamp, heat dissipation problem is the principal element that design is considered always.

Traditional LED Down lamp generally comprises led light source, mounts the heat-radiating substrate of light source and the tubular body of installation base plate.Radiating fin or heat pipe or other cooling mechanism are set on the described body.Described heat-radiating substrate is fixed on body interior, and needs and body keeps in touch.Described led light source is fixed on the heat-radiating substrate by welding or mounting method, and described heat-radiating substrate is fixed in the body and with body and contacts, and described body connects cooling mechanism, thereby sets up heat dissipation channel between cooling mechanism and light source.Because led light source produces a large amount of heats, described heat-radiating substrate generally adopts aluminium base or the tellite or the metal-cored tellite of perfect heat-dissipating.After being mounted on the heat-radiating substrate, led light source externally is coated with layer of transparent epoxy resin encapsulating material.

But traditional its heat-radiating substrate of LED Down lamp all is by third-party fixture, links together such as screw and tubular body.Concrete mode generally is to offer some installing holes in the periphery of tubular body installation heat radiator body, described heat-radiating substrate is offered screw in peripheral correspondence, some screws pass the installing hole of tubular body and cooperate with screw on the intrinsic heat-radiating substrate of tubular, thereby heat-radiating substrate is fixed on the tubular body.Therefore, the heat dissipation path between the tubular body of described heat-radiating substrate and installing cooling mechanism is a plurality of touch points, and a large amount of heats that led light source produces are conducted by heat-radiating substrate, are dispersed by cooling mechanism at last through plurality of touch points.Adopt traditional connected mode, the heat dissipation channel that some contact points form is little, can't in time heat be exhaled, and has increased thermal impedance, and radiating efficiency is low.During use, the temperature that causes the LED Down lamp is rising in about about 20 minutes, LED Down lamp luminous intensity and all can being affected service life under long-term high temperature action.

The utility model content

The technical problems to be solved in the utility model is to remedy above-mentioned the deficiencies in the prior art, and a kind of LED Down lamp that improves radiating effect is provided.

Technical problem of the present utility model is solved by the following technical programs: a kind of LED Down lamp, it comprises led light source, heat-radiating substrate and the radiating cylinder body of accommodating heat-radiating substrate, described led light source is installed in a side of heat-radiating substrate, and described heat-radiating substrate has the outer ring surface that is used for connecting radiating cylinder body; The inwall of described radiating cylinder body shrank and is close to the outer ring surface of heat-radiating substrate when described heat-radiating substrate was placed into cooling when radiating cylinder body expands, thereby set up unobstructed heat dissipation channel by outer ring surface between heat-radiating substrate and radiating cylinder body.

For better heat radiation, an end of described radiating cylinder body is provided with some radiating fins.

Perhaps as the alternative of cooling mechanism, described heat-radiating substrate is at the opposition side installing radiator of installing led light source, and described radiator comprises the heat radiator body of tight contact heat-radiating substrate and the some fin that extend from heat radiator body.

Preferably, further be provided with heat pipe on the described heat radiator body.

Specifically, described LED Down lamp also comprises the power supply unit of driving LED light source, the reflector that surrounds led light source guiding light and the transmissive mirror that is installed in LED Down lamp ejecting end.

Further, at least one picking up the ears of the periphery of described radiating cylinder body installing.

The utility model beneficial effect compared with prior art is: 1) in the LED Down lamp of the present utility model, periphery at heat-radiating substrate is provided with outer ring surface, utilize principle of expanding with heat and contracting with cold, the inwall of radiating cylinder body is close on the outer ring surface of heat-radiating substrate, change traditional some contact and be the face contact, increased heat dissipation path, can guide hot-fluid fast, effectively reduce thermal impedance, use LED Down lamp of the present utility model, temperature just raises to some extent after luminous 2 hours, in the service life of obviously improving the LED Down lamp, reduces the chance that luminous intensity decays; 2) LED Down lamp of the present utility model changes the contact of traditional point for face contacts, and has increased heat dissipation path, but on heat-radiating substrate additional heat such as attached heat sinks, heat pipe device also, good heat dissipation effect; 3) LED Down lamp of the present utility model is assembled by the mode of expanding with heat and contract with cold, and does not need the assembling of third party's element, does not need to offer lock solid structure, saves components and parts when increasing heat dissipation path, reduces cost of manufacture.

Description of drawings

Fig. 1 is the three-dimensional exploded view of first embodiment of the utility model LED Down lamp;

Fig. 2 is the cutaway view of first embodiment of the utility model LED Down lamp;

Fig. 3 is the combining structure schematic diagram of first embodiment of the utility model LED Down lamp;

Fig. 4 is the perspective exploded view of second embodiment of the utility model LED Down lamp;

Fig. 5 is the vertical view of second embodiment of the utility model LED Down lamp, and has indicated A-A, and B-B analyses and observe direction;

Fig. 6 be the utility model LED Down lamp second embodiment analyse and observe the cutaway view of direction along A-A;

Fig. 7 be the utility model LED Down lamp second embodiment analyse and observe the cutaway view of direction along B-B.

The specific embodiment

Also in conjunction with the accompanying drawings the utility model is described in further details below by concrete embodiment.

The utility model relates to a kind of LED Down lamp.

Please refer to Fig. 1 to Fig. 3, be first embodiment of the utility model LED Down lamp, it is a structure diagram.Described LED Down lamp comprises led light source 30, heat-radiating substrate 20 and radiating cylinder body 10.The radiating cylinder body 10 inner installation positions 11 that form.Led light source 30 is installed in a side of heat-radiating substrate 30.Heat-radiating substrate 20 peripheries have outer ring surface 22.Heat-radiating substrate 20 expands with heat and contract with cold by radiating cylinder body 10, fixes and is being housed in radiating cylinder body 10 inside, makes outer ring surface 22 be close to the inwall of radiating cylinder body 10, to form unobstructed heat dissipation path.

Concrete installation steps comprise:

Led light source 30 is installed in a side of heat-radiating substrate 20, in this example, led light source 30 is installed on the heat-radiating substrate 20 by the welding or the mode of pasting.For heat-radiating substrate 20 can be placed into when radiating cylinder body 10 expands, the external diameter of described heat-radiating substrate 20 need be slightly larger than the internal diameter of radiating cylinder body 10; In the preparation method of LED Down lamp of the present utility model, described radiating cylinder body 10 employing expansion rates are 3/1000ths aluminium cylindrical shell.Since aluminium 200 degrees centigrade under the situation of normal temperature thermal expansion be about 3/1000ths, the external diameter of described heat-radiating substrate 20 is zero internal diameter to 3/1000ths times of radiating cylinder bodies greater than the scope of radiating cylinder body 10 internal diameters.

Then, radiating cylinder body 10 is heated to 200～300 degrees centigrade, radiating cylinder body 10 adds thermal expansion, when described radiating cylinder body 10 internal diameters are slightly larger than heat-radiating substrate 20 external diameters, heat-radiating substrate 20 is inserted 11 places, installation position in the described radiating cylinder body 10;

At last, cool off described radiating cylinder body 10, make the inwall contraction of radiating cylinder body 10 be close to the outer ring surface 22 of heat-radiating substrate 20, thereby between heat-radiating substrate 20 and radiating cylinder body 10, set up unobstructed heat dissipation channel via outer ring surface 22.

Please refer to Fig. 4 to Fig. 7, be second embodiment of the utility model LED Down lamp, it is complete structure figure.

LED Down lamp in this example comprises radiating cylinder body 110, be installed in heat-radiating substrate 120 in the radiating cylinder body 110, be installed in a led light source 130 of heat-radiating substrate 120 1 sides and the power supply unit 50 that is positioned at heat-radiating substrate 120 opposite sides.In this example, described led light source 130 is fixed on the heat-radiating substrate by screw 32.The periphery of described heat-radiating substrate 120 forms the outer ring surface 122 that is used for connecting radiating cylinder body 110.The inwall of described radiating cylinder body 110 shrank and is close to the outer ring surface 122 of heat-radiating substrate 120 when described heat-radiating substrate 120 was placed into cooling when radiating cylinder body 110 expands, thereby set up unobstructed heat dissipation channel by outer ring surface 122 between heat-radiating substrate 120 and radiating cylinder body 110.

Described radiating cylinder body 110 is at top installing cover plate 40, and described power supply unit 50 is fixed on cover plate 40 belows by screw 42, and is housed in the radiating cylinder body 110.Cover plate 40 is provided with perforate, and the perforate that power line 80 passes cover plate 40 is connected on the power supply unit 50.Described power line 80 is at cover plate 40 tappings installing water joint 82.Described radiating cylinder body 110 is equipped with in the bottom decorates retainer plate 12, and described decoration retainer plate 12 can be used to fixedly transmissive mirror 36.Also be equiped with the reflector 34 that surrounds led light source 130 and be used for guiding light in the described radiating cylinder body 110.

The periphery installing of described radiating cylinder body 110 is at least one picks up the ears 60.Pick up the ears spring 62 to be set on 60, be used for the whole LED Down lamp is fixed on the ceiling.

In order to increase area of dissipation, described radiating cylinder body 110 is provided with some radiating fins at the top, and the heat that led light source 130 is dispersed diffuses in the air at the radiating fin place via heat-radiating substrate 120, outer ring surface 122, radiating cylinder body 110 and goes.

For further heat radiation, can on existing cooling mechanism, increase independent radiator.Described heat-radiating substrate 120 is at the opposition side installing radiator (figure does not show) of installing led light source 130, and described radiator comprises the heat radiator body of tight contact heat-radiating substrate and the some fin that extend from heat radiator body.

Adopt under the situation of great power LEDs at described led light source 130, caloric value is bigger, then can on the heat radiator body of described independent radiator heat pipe be set further.

Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims

1. a LED Down lamp comprises led light source, heat-radiating substrate and the radiating cylinder body of accommodating heat-radiating substrate, and described led light source is installed in a side of heat-radiating substrate, it is characterized in that: described heat-radiating substrate has the outer ring surface that is used for connecting radiating cylinder body; The inwall of described radiating cylinder body shrank and is close to the outer ring surface of heat-radiating substrate when described heat-radiating substrate was placed into cooling when radiating cylinder body expands, thereby set up unobstructed heat dissipation channel by outer ring surface between heat-radiating substrate and radiating cylinder body.

2. LED Down lamp according to claim 1 is characterized in that: an end of described radiating cylinder body is provided with some radiating fins.

3. LED Down lamp according to claim 1 is characterized in that: described heat-radiating substrate is at the opposition side installing radiator of installing led light source, and described radiator comprises the heat radiator body of tight contact heat-radiating substrate and the some fin that extend from heat radiator body.

4. LED Down lamp according to claim 3 is characterized in that: further be provided with heat pipe on the described heat radiator body.

5. according to any described LED Down lamp of claim 1-4, it is characterized in that: described LED Down lamp also comprises the power supply unit of driving LED light source, the reflector that surrounds led light source guiding light and the transmissive mirror that is installed in LED Down lamp ejecting end.

6. LED Down lamp according to claim 5 is characterized in that: at least one the picking up the ears of periphery installing of described radiating cylinder body.