RU2549338C2 - Street light-emitting diode illuminator - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention relates to lighting fixtures based on solid-state semiconductor light sources. The device consists of the housing, made from heat-conducting material, and light modules. The housing has a central compartment intended for placement at least of one power supply and at least one lighting module and two peripheral compartments intended for placement of lighting modules. The mass of the lighting fixture and its power are related by the following relations: the lighting fixture mass at the lighting fixture power up to 100 W doesn't exceed 2 kg, the mass of the lighting fixture at the power up to 50 W doesn't exceed 0.9 kg.

EFFECT: improvement of efficiency of heat release which is achieved due to use of lighting support consoles or fastening arms, located outside the lighting fixture.

11 cl, 14 dwg, 2 tbl

Description

Technical field

The invention relates to the field of LED lighting devices and is intended for use in order to illuminate mainly streets, roads, small unloaded highways.

State of the art

A number of solutions of LED lamps are known, which are used to illuminate mainly streets and are mounted on a console pipe of a lighting support:

- RU 123495 U1, F21S 13/00, 05.25.2012;

- RU 122749 U1, F21S 13/00, June 15, 2012;

- RU 120190 U1, F21S 13/00, 02/10/2012;

- RU 109827 U1, F21S 8/00, 03/09/2010;

- EP 2206945 B1, F21S 8/00, F21V 29/00, F21K 99/00, 12/30/2008;

- RU 2473007 C1, F21V 19/00, 06/10/2011;

- RU 91617 U1, F21S 13/00, 10.27.2009;

- RU 125299 U1, F21S 13/10, June 13, 2012;

- RU 83587 U1, F21S 13/10, 01/20/2009;

- RU 117571 U1, F21S 4/00, 12/15/2011;

- RU 112340 U1, F21S 4/00, 08/11/2011;

- RU 83314 U1, F21S 4/00, F21V 14/00, 12/30/2008.

All of them are related to analogues of the claimed invention. In this case, the closest of the analogues are the solutions:

- RU 109827 U1, F21S 8/00, 03/09/2010;

- RU 125299 U1, F21S 13/10, June 13, 2012;

- RU 83314 U1, F21S 4/00, F21V 14/00, 12/30/2008.

They contain a minimum of components, the radiator case here is made of solid cast material from a heat-conducting material (usually an aluminum alloy).

For the prototype, an analogue was adopted - RU 83314 U1, F21S 4/00, F21V 14/00, 12/30/2008: housing-radiator-bracket with mounting on the console of the lighting support. The disadvantage of this device is the increased material consumption when applied on small streets and similar in nature areas with a device power in the range from 70 to 150 watts.

The specified device copes with the task of lighting, but when it is scaled down (reducing the luminous flux due to the installation of a smaller number and lower power of radiation sources), it becomes less economically justified, since in this case the radiator-body-bracket has an excess heat dissipation surface and, consequently, the mass, which, taking into account its implementation from a heat-conducting material (aluminum alloy), makes it many times more expensive.

The technical task in the development of this device was the task of providing the required lighting conditions with minimal costs for material, product assembly, its installation and operation, which is especially important for mass use devices.

SUMMARY OF THE INVENTION

The idea of the invention is to use structures external to the product, namely, metal consoles of lighting poles, mounting brackets, for the purpose of additional heat removal from a working device, i.e. in fact, the use of consoles of lighting poles (mounting brackets) as a radiator of a lamp. Operating experience of similar devices shows that part of the heat from the lamp is transferred to external structures. In addition, in such products, the luminous flux power is usually excessive and more than normal. Those. there are losses, they are relatively small, however, with long periods of operation (and LED devices belong to them), losses reach significant values. Therefore, if you select a luminaire power that is close to optimal, the external structures will play a significant role in heat dissipation and can be considered as part of the luminaire.

We give the thermophysical properties of the materials used and the external substance in table 1.

Table 1 Steel Aluminum Difference in Air Coefficient of thermal conductivity,
W / (mK) 43 200 4.7 0,026 Specific heat, J / (kg · K) 440 900 2,3 1005

Consequently, steel conducts heat worse than aluminum by 4.7 times, and in order to heat a unit of mass of a steel part by 1 degree, 2.3 times less heat is needed than for a unit mass of a part from aluminum. Obviously, the use of aluminum and alloys based on it as radiators for lighting devices and not only for them. However, the consoles of the lighting poles are made of steel.

Consider the temperature distribution on a steel console Ø 48 × 3, L = 1 m, at one end of which a temperature of 60 ° C is applied (the initial threshold for limiting the thermal mode of operation of the light fixture), which corresponds to the operation of a 20 W LED street lamp. The outside temperature is 18 ° C, laminar mode (indoors). The heat transfer coefficient of the steel pipe h = 13.81 W / m ² · K. Consider the simulation results (theoretical experiment): the temperature dependences presented along the length of the console pipe in Fig. 1 and the diagram of the temperature distribution along the console pipe in Fig. 2.

Conclusion: the temperature drops to room temperature after 20-25 cm, i.e. only 1/5 of the pipe works.

If we accept the turbulent mode (on the street), then the heat transfer coefficient of the steel pipe will be 2-2.5 times greater, therefore, on the street using the console, you can additionally "remove" heat from the light device 40-50 W.

Practical experiment:

We present the results of testing with painted paint in three layers of a steel pipe with an outer diameter of Ø48 mm and a wall thickness of 3 mm under the following conditions.

Indoor installation at a distance of 0.5 m from the floor horizontally. Temperature 18 ° C. The heat source - the transistor housing TO220 is fixed two cm from the end of the pipe, the temperature sensor - also, only on the opposite wall of the pipe.

The heating of the pipe is observed for 40-50 cm from the heat source. This difference compared with the theoretical experiment is explained by the presence of paint, which prevents heat loss (like an insulator) and the pipe warms up in length. The measurement results are shown in table 2.

table 2 The brought power, W twenty eighteen 16 fourteen 12 10 8 Temperature near the heat source, ° C 61 59 56 54 49 43 40 Temperature difference 43 41 38 36 31 25 22

Thus, in the room, the power limit of the light fixture is up to 20 W (corresponding to a temperature of 60 ° C). On the street - up to 50 watts.

The test results of a 36 W luminaire mounted on a painted Ø48 × 3 pipe indoors show a similar pattern. According to the thermal imager, the temperature of the lamp housing is 55 ° C, the temperature on the pipe at the junction with the lamp is 39-40 ° C and drops to a room temperature of 50-60 cm. Due to the presence of paint, the material itself “works” along the length of the console and, of course, the lamp housing itself, in comparison with the first practical experiment, where 20 W were supplied directly to the pipe.

If we take the power of the light device 100 W, then half of the radiated heat is able to dissipate the external structure. Therefore, the mass of the housing of the light fixture can be reduced by 2 times or not one, but two, of the fixtures can be manufactured with the same material costs, which, taking into account the cost of aluminum-based alloys and the mass of the product, leads to significant savings. Of course, since the thermophysical properties of steel are less advantageous than aluminum (or similar heat-conducting material), less heat will be dissipated by external structures. In addition, the technical result is manifested here at an ambient temperature of 25-30 ° C, i.e. in hot weather (at lower temperatures, the casing will cope with the task of heat dissipation on its own). However, it is hot weather that is the boundary condition for the functioning of the lamp.

Thus, it is most relevant for devices with power up to 100 watts. At greater power, due to the difference in the thermal conductivity of steel and aluminum (similar to it), the effect is lost, since the contribution of external structures in the overall picture becomes insignificant.

The task is to search for the smallest mass of the lamp housing and, as a result, the lamp itself while maintaining the quality of the product and its operational characteristics. Of particular relevance is the idea of the present invention for street lamps, since in the vast majority of cases they are installed on the console of the lighting support. The lamp may have the following implementation.

The case is made of heat-conducting material with the light module (s) installed in it, with solid-state (s) light source (s) and current source (s) for their power supply, which can be placed both inside the case (on the case) and outside, for example, in the console or in the body of the support. The case is made of a profile cast, stamped or prefabricated from these parts. For more efficient heat dissipation, cooling slots (openings) can be made in the housing. To form a half-wide KSS (typical for street lamps), part of the light modules are placed at an angle along the periphery of the housing. It is possible to use a plafond, which for obtaining different radiation patterns can have modular optics in the form of lenses of complex shape with a displacement (without displacement) of solid-state semiconductor light sources relative to their focus, or without it with compound filling with components. Light (s) modules (b) contain (contains) at least one solid-state semiconductor light source, incl. and made on chip-on-board technology (chip on the board) or monochrome (in this case, the inner surface of the lampshades is coated with a phosphor, as a result of which the monochrome light is converted to white). The light modules are fastened with self-tapping screws, screws, heat-conducting adhesive, heat-conducting adhesive tape.

Effect: - increase the efficiency of heat transfer per unit mass of the lamp, W / kg;

- improving the efficiency of light output, lighting characteristics, for example, the luminous flux per unit mass of the lamp, Lumen / kg;

- reducing the material consumption of the casing-radiator-bracket, as a result of the entire lamp.

The technical result is achieved:

- the ratio of the geometric configuration, the mass of the lamp and its power: the mass of the lamp with a power of up to 50 W does not exceed 0.9 kg; the mass of the lamp with a power of up to 100 W does not exceed 2 kg;

- the possible use of heat-conducting material between the body and the console.

List of drawings

The essence of one of the possible implementations of the invention is illustrated by the following graphic materials presented in FIG. 1-12:

FIG. 1 - LED street lamp (perspective view from below);

FIG. 2 - LED street lamp (front view);

FIG. 3 - Street LED lamp (side view);

FIG. 4 - LED street lamp (top view);

FIG. 5 - Street LED lamp (bottom view);

FIG. 6 - LED street lamp (perspective view from below, plafonds not shown conventionally);

FIG. 7 - Housing-radiator-bracket of the LED street lamp (perspective view from below);

FIG. 8 - LED street lamp (top view in perspective);

FIG. 9 - Street LED lamp of increased power (top view in perspective view);

FIG. 10 - Street LED lamp with increased power (perspective view from below);

FIG. 11 - Street LED lamp (bottom perspective view, illustration);

FIG. 12 - Street LED lamp with increased power (perspective view from above, illustration).

The list of items indicated in the figures

1 - Housing-radiator-bracket (housing) of the lamp;

1-1 - Central compartment of the lamp housing;

1-2 - Support area of the central light module of the lamp;

1-3 - Niche for installing peripheral light modules of the lamp;

1-4 - Hole for wiring the supply wires of peripheral light modules;

1-5 - Bracket of the lamp housing;

1-6 - Structural element for fixing the lamp on the console;

1-7 - The inner cavity of the bracket of the lamp housing;

1-8 - The peripheral compartment of the housing;

2 - power supply;

3 - Central light module of the lamp;

4 - Peripheral light module of the lamp;

5 - Central lamp shade;

6 - Peripheral lamp luminaire;

6-1 - Lens modular optics peripheral lamp luminaire.

The implementation of the invention

One of the possible implementations of the lamp is carried out and works as follows.

The power sources 2 are installed in the central compartment 1-1 of the body-radiator-bracket 1. Next, the light modules are installed: central 3 - along the support platform 1-2, peripheral 4 - in niches 1-3 of the peripheral light-emitting compartments, while the power wires for these modules are fed through holes 1-4. The presence of peripheral compartments is due to the half-wide KSS. The luminaire is sealed with two peripheral shades 6 and a central 5, which have lenses of modular optics for the formation of various KSS. The luminaire is mounted on the lighting support console by means of an arm 1-5, fixing is carried out by bolts according to structural elements 1-6. Previously, heat-conducting material (thermal grease, heat-conducting greases, etc.) can be applied to the internal cavity of the bracket 1-7, which reduces the thermal resistance at the interface between the casing and the console. When the luminaire operates in peripheral and central zones, the necessary KSS is formed (wide, half-wide or otherwise, depending on the location of the light sources relative to the focus of the lenses of modular optics). Part of the heat from the peripheral zones is independently dissipated by the side radiators, the heat from the central light module 3 along the reference sites 1-2 is removed by the central part of the casing-radiator-bracket and the external console structures.

Claims (11)

1. Street LED lamp containing a housing-radiator-bracket of heat-conducting material with installed (and) light (s) module (s) in it, closed or not closed shades, each of which has at least one solid-state light source and source ( i) current for their power supply, characterized in that it has a central compartment and two peripheral ones for accommodating light modules, the central compartment being designed to accommodate power source (s) and light module (s) or light module (s) ), while the mass of lights and a lamp power are related by:
- the mass of the lamp with a lamp power of up to 100 W does not exceed 2 kg;
- the mass of the lamp with a lamp power of up to 50 W does not exceed 0.9 kg.        2. The street LED lamp according to claim 1, characterized in that it has shades made of transparent, or translucent, or opaque diffusing material.        3. The street LED lamp according to claim 1, characterized in that a heat-conducting material is used to reduce thermal resistance between the external structures and the lamp housing.        4. The street LED lamp according to claim 1, characterized in that each of the light modules contains at least one solid-state semiconductor light source, implemented on chip-on-board technology (chip on the board).        5. The LED street lamp according to claim 1, characterized in that in each of the light modules solid-state semiconductor monochrome light sources are used, while the inner surface of the lampshades is coated with a phosphor, as a result of which the monochrome light is converted to white.        6. The LED street lamp according to claim 1, characterized in that the fastening of the light modules is carried out with self-tapping screws, or screws, or heat-conducting adhesive, or heat-conducting adhesive tape.        7. The street LED lamp according to claim 1, characterized in that it has shades made in conjunction with modular optics containing lenses.        8. The street LED lamp according to claim 7, characterized in that the light sources are located in the focus of the lenses of modular optics.        9. The LED street lamp according to claim 7, characterized in that the light sources are not in the focus of the lenses of modular optics.        10. The LED street lamp according to claim 1, characterized in that the housing-radiator-bracket has cooling slots.        11. The street LED lamp according to claim 1, characterized in that the housing-radiator-bracket of the lamp is made of a profile cast, stamped or prefabricated from these parts.

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