RU2678901C1 - Light-emitting diode lamp - Google Patents

Abstract

FIELD: lighting engineering.SUBSTANCE: invention relates to the structures of lighting devices, in particular to the structures of LED lamps. Claimed LED lamp consists of the base for fixing and connecting to an external electrical circuit, of a driver, of at least one LED light source installed in the light-transmitting flask, the heat-conducting substance that fills the cavity of the light-transmitting bulb. Moreover, the flask is made in the form of a flexible light-transmitting shell of a rigid thermodeformable material, and the heat-conducting substance is made in the form of a light-transmitting solidifying elastic after its hardening compound.EFFECT: increased reliability, durability, efficiency and low cost.3 cl, 4 dwg

Description

The invention relates to structures of lighting devices, in particular to structures of LED lamps.

The closest analogue of the invention is the "LED lamp" (Description of the invention to patent RU 2546469 C2 published 04/10/2015). In the known solution, one or more LED strips (filaments) are used as a light source, which are mounted with a holder in an airtight chamber filled with gas having a low viscosity coefficient and high thermal conductivity. During operation, LED strips emit heat. The problem of heat removal from the LED strip is solved by heat fluxes and convection in the gas filling the chamber.

A disadvantage of the known solution is the limitation of the power of LED strips due to the low thermal conductivity of the gas filling the chamber and weak convection, which is associated with heating of the gas in a small volume. In addition, for long-term gas retention, it is necessary to use sealed glass flasks, which increases the cost of the lamp. In addition, the known device (LED lamp) has an increased fragility due to the use of glass.

The problem solved by the invention and the technical result achieved is to create the next technical solution for an LED lamp having high reliability, strength, efficiency, low cost.

To solve the problem and achieve the claimed technical result, in the LED lamp, consisting of a base for fixing and connecting to an external electrical circuit, drivers, at least one LED light source installed in the light-transmitting bulb, a heat-conducting substance filling the cavity of the light-transmitting bulb, bulb made in the form of a flexible light-transmitting shell of a rigid thermally deformable material, and the heat-conducting substance is made in the form of light-transmitting hardening its elastic after hardening of the compound.

Besides,

- LED light source consists of several LEDs;

- The LED lamp contains an additional base for fixing and connecting to an external electrical circuit.

The invention is illustrated by drawings, which depict:

In FIG. 1 - LED lamp (in section),

In FIG. 2 - LED lamp with a convex-concave shell.

In FIG. 3 - LED lamp.

In FIG. 4 - LED lamp with two caps.

Terms and Definitions:

- rigidity means the ability of a material to resist deformation under external influence;

- the elasticity of the hardened compound implies its ability to restore size and shape after deformation;

- LED light source means a light source with one or more LEDs mounted on one board, substrate.

The invention is illustrated in FIG. 1. In FIG. 1 item 1 - LED light sources, pos. 10 - LEDs, pos. 3 - flexible light-transmitting shell, pos. 4 - light transmitting hardened elastic compound, pos. 5 - driver, pos. 6 - thermal relay, pos. 7 - holder, pos. 8 - base. Unlike the prototype, the lamp has a flexible light-transmitting shell, the heat released by the LEDs is removed due to heat fluxes in the hardened light-transmitting compound.

The claimed technical result is high reliability, strength, low cost is achieved through the use of a flexible light-transmitting shell filled with hardened elastic compound. Improving the lamp efficiency is achieved by improving the cooling of the LEDs and the driver through the use of a heat-conducting substance with a large coefficient of thermal conductivity. The thermal conductivity coefficient used in the prototype for heat removal of gases (hydrogen and / or helium) at the operating temperatures of the LEDs does not exceed 0.2 W / (m * K). Gravity convection, as specified in the description of the prototype, does not significantly affect the cooling of the lamp due to the small volume of the bulb. The compound used to remove heat has a thermal conductivity higher than the thermal conductivity of gases. For example, Silagerm 2206 transparent hardening silicone has a thermal conductivity of 0.4 W / (m * K). The thermal conductivity of the compound is increased by introducing heat-conducting transparent additives, for example, glass beads.

The temperature of the LED light sources of the lamp depends on the temperature of the shell, the length of the heat path from the light source to the shell, the heat-conducting cross sections of the heat fluxes and the thermal conductivity of the material of the heat conduit - compound and is expressed by the well-known Fourier heat equation:

where ΔТ is the temperature difference between the temperature of the light source and the lamp shell, P is the heat flux power, L is the heat path length, k is the compound's thermal conductivity coefficient, S is the area of the heat-conducting cross section of the heat flux. The temperature of the lamp shell is inversely proportional to its area with which heat is dissipated into the surrounding air due to convection and radiation. An increase in the sheath area can lead to an increase in the volume of the lamp and, accordingly, to an excessive increase in its weight, which is associated with the density of the compound filling it. The manufacture of a shell from a rigid thermally deformable material allows to give it any shape without technological costs, for example, as in FIG. 2. Depression pos. 9 in FIG. 2 can reduce the volume and accordingly the weight of the lamp while maintaining or increasing the area of the shell. In addition, the location of the LED source in the protrusion of the lamp shell leads to a reduction in the heat path L and an increase in the area of the heat-conducting cross section of the heat flux S (heat equation) and thus lowering the temperature of the LED light sources.

The area of the heat-conducting cross section of the heat flux S is determined by the areas of the heat-conducting cross sections through which the heat flux is directed, including the surface area of the bulb with which heat is dissipated and the surface area of the LED light source from which heat is removed. In general, such an area is defined as:

where F (x) is the function of the cross section of the variable body, L is the length of the heat path (Garwin's theorem). Thus, an increase in the area of the heat-conducting section of the heat flux S in the lamp is possible by increasing the area of the LED light source, for example, by increasing the area of the heat-conducting board on which the LEDs are mounted.

Unlike the prototype, the lamp may not have a holder for LED light sources - the compound will hold them after hardening. The hardened compound can act as a diffuser; for this, it is necessary to mix diffusing pigment or hollow glass microspheres into it. The lamp can be used with blue light emitting diodes and a remote phosphor emitting additional colors under the influence of blue light. The distant phosphor can be applied to a light-transmitting shell or evenly mixed in a transparent compound.

The practical implementation of the LED lamp is illustrated in FIG. 3.

The bulb of the lamp illustrated in FIG. 3, made of polyethylene terephthalate (PET, softening point 260 ° C) 0.35 mm thick. LED light sources of the lamp are made in the form of filaments - LED filaments, which are a glass or sapphire substrate, on which there are many LEDs coated with a common phosphor. By using two plinths, it is possible to make the lamp illustrated in FIG. four.

Claims (3)

1. LED lamp, consisting of a base for fixing and connecting to an external electrical circuit, a driver, at least one LED light source installed in a light-transmitting bulb, a heat-conducting substance filling the cavity of the light-transmitting bulb, characterized in that the bulb is made in the form of a flexible light-transmitting the shell is made of hard thermo-deformable material, and the heat-conducting substance is made in the form of a light transmitting hardening elastic compound after hardening. 2. The LED lamp according to claim 1, characterized in that the LED light source consists of several LEDs. 3. The LED lamp according to claim 1, characterized in that it contains an additional base for fixing and connecting to an external electrical circuit.

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