CN201339887Y

CN201339887Y - LED fluorescent lamp

Info

Publication number: CN201339887Y
Application number: CNU200920050189XU
Authority: CN
Inventors: 吴乾; 陈新苗; 胡康乐; 王跃飞; 刘书宁; 李国平
Original assignee: Guangzhou Hongli Tronic Co Ltd
Current assignee: Hongli Zhihui Group Co Ltd
Priority date: 2009-01-15
Filing date: 2009-01-15
Publication date: 2009-11-04
Anticipated expiration: 2019-01-15

Abstract

The utility model discloses an LED fluorescent lamp, which comprises an LED lamp, a resistance, a substrate and a housing, wherein the substrate is a hollow metal tube with two enclosing ends; the cavity formed in the metal tube is a vacuum cavity; a circuit layer is arranged on the metal tube; the LED lamp and the resistance are welded on the metal tube; and heat-conducting liquid droplets are arranged in the vacuum cavity. As the cavity of the metal tube is the vacuum cavity and the heat-conducting liquid droplets are arranged in the vacuum cavity, the heat-conducting liquid droplets are vaporized into vapor from liquid by phase transformation theory to absorb a lot of heat; when the heat-conducting liquid droplets are liquefied into droplets from vapor, the heat is released, so as to emit the heat emitted by the LED lamp outside with high radiating efficiency, therefore, the service life of the LED lamp is prolonged and the drift of color temperature is inhibited.

Description

A kind of LED fluorescent lamp

Technical field

The utility model relates to the LED lighting field, especially a kind of LED fluorescent lamp.

Background technology

Because the LED fluorescent lamp has energy-saving and environmental protection and long service life, the application of LED fluorescent lamp increases day by day.The maximum characteristics of LED fluorescent lamp are exactly energy-conservation, because the situation of shortage of electric power appearred in most of city in recent years, place, many cities is all installed and used a large amount of LED fluorescent lamps, alleviates the situation of urban electricity supply deficiency greatly.This theme of " green Games " is released in Beijing Olympic Games, and the LED fluorescent lamp arises under this theme just, compares the environmental protection of LED fluorescent lamp with usual fluorescent lamp, does not bring pollution.And the matter of utmost importance that suppresses the development of LED fluorescent lamp at present is the life-span, a large amount of heats that the basic factor that influences the LED fluorescent lifetime is distributed when being the LED fluorescent lamp operation, therefore the radiating rate of LED fluorescent lamp is directly connected to the length in its life-span, and, the luminous efficient of LED also depends critically upon temperature, so the life-span of solution LED fluorescent lamp and the problem of luminous efficiency are the heat dissipation problem that will solve the LED fluorescent lamp after all.As Chinese patent, notification number is a kind of high-power LED street lamp of CN201043702Y, and the aluminium sheet that is connected with the LED lamp is connected with the copper heat pipe, and the copper heat pipe connects fin, and its internal cavities has heat-conducting liquid.This structure is passed to fin by the mobile heat that the LED lamp is distributed of the thermal cycle of heat-conducting liquid in the copper heat pipe, realizes the heat radiation to the LED lamp at last.Though this kind radiating mode is improved, still there is deficiency, the heat dissipation path of its LED lamp need be passed through aluminium sheet, copper heat pipe, fin, and radiating efficiency is affected to a certain extent.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of LED fluorescent lamp, and wherein, the colour temperature drift phenomenon of LED lamp is grown and can be suppressed to the radiating efficiency height of LED lamp, life-span.

For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of LED fluorescent lamp comprises LED lamp, resistance, substrate, shell; Described substrate is the metal tube of hollow and closed at both ends, and formed cavity is a vacuum cavity in the described metal tube, and described metal tube is provided with circuit layer, and described LED lamp and resistance are arranged on the described metal tube, are provided with the heat conduction drop in the described vacuum cavity.The LED lamp is directly welded on the metal tube of hollow, and the heat that is distributed during the work of LED lamp can directly distribute to the external world by metal tube.Because the metal tube internal cavities is a vacuum state, and be provided with the heat conduction drop in the cavity, conductive fluid drops in the heating that is subjected to metal tube in the metal tube, liquid heat conduction drop vaporization, in the cavity of vacuum, form gas, gas raises because of having absorbed a large amount of heat temperature, convection type according to gas, the gas of high temperature in metal tube to the diffluence of metal tube low-temperature end, the gas of high temperature gathers at the relative cold junction of metal tube, and according to heat exchange pattern, heat will be from the metal tube transmission of high-temperature gas to low temperature, gas heat is distributed, temperature reduces, and is liquefied as drop once more, and the heat conduction drop flows to the heating end of metal tube once more, continue to absorb the heat of metal tube, to enter thermal cycle next time.

As improvement, described inner wall of metal tube many strip metals striped that extends internally out forms concavo-convex inwall.Inner wall of metal tube concave-convex surface, inner wall area obtain increasing.After the vaporization of heat conduction drop formed gas, gas was not only carried a large amount of heats secretly, and its volume increase, and gas flows in the metal tube cavity, outwards conducts heat by inner wall of metal tube, and gas and inner wall of metal tube contact area are big more, and the radiating rate of gas is fast more.

As improvement, it is heat sink that described metal tube surface is provided with stamping forming LED lamp, and the corresponding LED lamp of described each LED lamp is heat sink.The LED lamp directly is connected with metal tube by the LED lamp is heat sink, and the heat that the LED lamp is distributed is delivered on the metal tube faster by the LED lamp is heat sink, and radiating efficiency is improved.

As improvement, described heat conduction drop is water or ethanol or ether.

As improvement, described metal tube is provided with power supply.The heat that is distributed during power work also can outwards distribute by metal tube.

As improvement, described metal tube two ends are provided with lamp holder.Holder structure has made things convenient for the installation of metal tube.

As improvement, described metal tube is located in the shell.Metal tube and shell directly are connected to form an overall structure.

As improvement, described metal tube is a copper pipe.As being used for conduction and heat conductive metal pipe, copper pipe has more good thermal conductivity, electric conductivity.

As improvement, described per 3～6 LED lamps series connection is one group of LED lamp string, and described one group of LED lamp string is provided with a resistance, and is in parallel between described lamp string and the lamp string.

The beneficial effect that the utility model is compared with prior art brought is:

The metal tube of hollow is as the substrate of LED lamp, and the LED lamp directly is arranged on the metal tube, and the heat that the LED lamp is distributed directly distributes to the external world by metal tube, the radiating efficiency height.

The metal tube cavity is a vacuum cavity, and the heat conduction drop is arranged in the cavity, pass through Transformation Principle, the heat conduction drop is vaporized into gas and is absorbed a large amount of heats by liquid state, release heat when the heat conduction drop is liquefied as drop by steam state, thereby the heat that the LED lamp is distributed outwards distributes, and radiating rate is further accelerated.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is located at stereogram on the metal tube for the LED lamp;

Fig. 3 is the cutaway view stereogram of metal tube;

Fig. 4 is the cross-sectional view of metal tube.

The specific embodiment

The utility model is described in further detail below in conjunction with Figure of description.

Shown in Fig. 1～3, a kind of LED fluorescent lamp comprises LED lamp 1, resistance 7, substrate, shell; Described substrate is the metal tube of hollow and closed at both ends, metal tube in the present embodiment is a copper pipe 4, the basic copper pipe 4 interior cavitys that form of described conduct are pumped into vacuum state, be provided with heat conduction drop (not indicating) in the described vacuum cavity, heat conduction drop in the present embodiment is a water droplet, and this water droplet can flow freely in vacuum cavity.Described copper pipe 4 surfaces are provided with circuit layer and stamping forming LED lamp heat sink 2, described each LED lamp 1 corresponding LED lamp heat sink 2, LED lamp 1 firmly is installed on the copper pipe 4, described resistance 7 is directly welded on the circuit layer (not indicating) of described copper pipe 4, per three LED lamps, 1 series connection is one group of lamp string, described one group of LED lamp string is provided with a resistance 7, be to be provided with a resistance 7 every three LED lamps 1 on the circuit layer, between described LED lamp string and the LED lamp string after the parallel connection again be located at copper pipe 4 on power supply (indicating) connect.The termination of 4 liang of sealings of copper pipe is provided with lamp holder 6, and copper pipe 4 is installed on the shell 3 by two lamp holders 6.As shown in Figure 4, the described copper pipe 4 inwalls many strip metals striped 5 that extends internally out, described metal stripe 5 is triangular in shape, forms concavo-convex inwall, has further increased copper pipe 4 inner wall areas.

Radiating principle of the present utility model is as follows:

Shown in Fig. 1～3, LED lamp 1 in the LED fluorescent lamp gets electric and luminous work, for satisfying the demand of fluorescent light flux, LED lamp 1 is selected high-power LED lamp 1 for use, though high-powered LED lamp 1 luminous flux is big, but the heat that is distributed during its work is also big, and this also is a key factor of restriction high-powered LED lamp 1 range of application.In the present embodiment, the heat that high-power LED lamp 1 gives out has two kinds and distributes approach: first, since high-powered LED lamp 1 directly be arranged at the LED lamp 1 of copper pipe 4 heat sink on, the end that copper pipe 4 is provided with LED lamp 1 is a heating end, not having an end that is welded with LED lamp 1 is colling end, the heat that LED lamp 1 distributes is directly conducted on the copper pipe 4 that is in contact with it, because copper pipe 4 thermal conductivity are good, in a large amount of heats that high-powered LED lamp 1 is distributed, wherein sub-fraction is carried out heat transmit by copper pipe 4 heating ends to colling end by the conductor heat transfer theory, and heat distributes to the external world after arriving copper pipe 4 colling ends.The second, copper pipe 4 internal cavities are vacuum state, and water droplet exists in the cavity and flows freely, and under the normal temperature state, water droplet is for liquid and be present in the heating end of copper pipe 4.When high-powered LED lamp 1 work and when copper pipe 4 transmits a large amount of heat, copper pipe 4 temperature sharply rise, the heat conduction of the heat of fraction by conductor distributed to the external world in the copper pipe 4, but wherein most heat has little time to distribute, and the heat of this part will heat the water droplets in the copper pipe 4.Because the volume of water droplet is little, copper pipe 4 internal gas pressures are low, and water droplet is easy to be heated to boiling point, and in the vaporization of copper pipe 4 internal cavities, steam forms gas in vacuum cavity.Gas raises because of having absorbed a large amount of heat temperature, according to the convection type of gas, the gas of high temperature in copper pipe 4 cavitys heating end to the colling end diffluence, and in copper pipe 4 cavitys relatively colling end gather, according to heat exchange pattern, heat will be from the copper pipe 4 inwall transmission to low temperature of the gas of high temperature.In order to increase the heat that copper pipe 4 inwalls absorb gas transfer, at the copper pipe 4 inwalls leg-of-mutton metal stripe 5 that extends internally out, make to have increased copper pipe 4 inner wall surface area by copper pipe 4 inwall concave-convex surfaces that gas and copper pipe 4 inwall contacts area increase, in the unit interval, gas increases to the heat that copper pipe 4 transmits, therefore, and in the unit interval, the heat that copper pipe 4 outwards distributes makes its radiating efficiency height also along with increase.After heat in the gas obtains distributing, temperature reduces and formation steam, and adhere at copper pipe 4 colling end inwalls, steam slowly is agglomerated into water droplet, when water droplet gathers constant weight, water droplet will be back to the heating end of copper pipe 4 once more, and the water droplet of backflow is heated by copper pipe 4 again, vaporize again successively then, liquefy, form a circulation.Water droplet becomes the carrier of heat delivery, and by the phase transition process of water droplet in copper pipe 4 cavitys, a large amount of heats that high-powered LED lamp 1 is distributed effectively distribute to the external world.

Hollow metal pipe in the utility model is as the substrate of LED lamp 1, LED lamp 1 can be welded on the metal tube together with support, perhaps LED lamp 1 is welded on the LED lamp heat sink 2 that comes out by the punching press of metal tube surface, the heat that LED lamp 1 is distributed directly distributes to the external world by metal tube, the radiating efficiency height.The metal tube cavity is a vacuum cavity, and the heat conduction drop is arranged in the cavity, pass through Transformation Principle, the heat conduction drop is by liquid state vaporization and become gas and absorb a large amount of heats, release heat when the heat conduction drop is liquefied as drop by steam state, thereby the heat that LED lamp 1 is distributed outwards distributes, and radiating rate is further accelerated.Described metal tube can be that copper pipe 4, aluminum pipe, iron pipe etc. have conduction, heat conductive metal pipe; Described heat conduction drop can be low-boiling drops such as water droplet, ethanol, ether.

All have the utility model structure and just in form change, and all belongs to protection category of the present utility model.

Claims

1. a LED fluorescent lamp comprises LED lamp, resistance, substrate, shell; It is characterized in that: described substrate is the metal tube of hollow and closed at both ends, formed cavity is a vacuum cavity in the described metal tube, described metal tube is provided with circuit layer, and described LED lamp and resistance are arranged on the described metal tube, are provided with the heat conduction drop in the described vacuum cavity.

2. a kind of LED fluorescent lamp according to claim 1 is characterized in that: described inner wall of metal tube many strip metals striped that extends internally out forms concavo-convex inwall.

3. a kind of LED fluorescent lamp according to claim 2 is characterized in that: it is heat sink that described metal tube surface is provided with stamping forming LED lamp, and the corresponding LED lamp of described each LED lamp is heat sink.

4. a kind of LED fluorescent lamp according to claim 3 is characterized in that: described heat conduction drop is water or ethanol or ether.

5. a kind of LED fluorescent lamp according to claim 4, it is characterized in that: described metal tube is provided with power supply.

6. a kind of LED fluorescent lamp according to claim 5 is characterized in that: described metal tube two ends are provided with lamp holder.

7. a kind of LED fluorescent lamp according to claim 6, it is characterized in that: described metal tube is located in the shell.

8. a kind of LED fluorescent lamp according to claim 7 is characterized in that: described metal tube is a copper pipe.

9. a kind of LED fluorescent lamp according to claim 8 is characterized in that: described per 3～6 LED lamps series connection is one group of LED lamp string, and described one group of LED lamp string is provided with a resistance, and is in parallel between described lamp string and the lamp string.