RU64321U1 - LIGHTING DEVICE - Google Patents

Abstract

The utility model relates to lighting devices based on LEDs and can be used for lighting museum, industrial, warehouse and other premises for various purposes, as well as in transport. The objective of the proposed device is to increase the service life, power and maximum operating temperature of lighting devices using LEDs, as well as expanding the scope of application of such devices. To solve the tasks, a lighting device containing an LED 1, which is mounted on a board 2 mounted in the housing 11, is supplemented with a heat removal unit from the LED. The exhaust unit contains a layer 6 of heat-conducting paste, heat-conducting wire 7 and a radiator 9. As a heat-conducting wire 7, the housing 11 of the lighting device or an independent T-shaped article in cross section can be used. The paste layer 6 can be applied between the board 2 and the heat conductor 7, as well as between the heat conductor and the radiator 9 and between the two parts of the heat conductor 7 and 7A. The radiator can have a different design, for example, with longitudinal or transverse ribs 10. 6 pf, 3 fig.

Description

The utility model relates to lighting devices based on LEDs and can be used for lighting museum, industrial, warehouse and other premises for various purposes, as well as in transport.

Modern technologies allow you to create light sources of small sizes and with low energy consumption, for example, LEDs that have sizes up to 1 cm and a power of about 0.1 watts. Such lamps are widely used in small flashlights or as a reading lamp. To create more powerful luminaires in one housing, several LEDs are usually used at once. However, this complicates the device, but does not create enough lighting for the rooms.

In recent years, LEDs with a power of 1 W to 5 W have appeared. However, their use in lighting devices is complicated by the fact that during operation such LEDs quickly overheat and fail. This is explained as follows. The heat generated by the light source and ballasts first heats the air inside the lamp, only then it is released through the lamp body. For better heat transfer, the outer walls of the luminaires are made ribbed. With such heat removal, the thermal resistance of the light source - the environment is large, the light source is heated to high temperatures, and this is unacceptable for LEDs.

An original solution is proposed for the removal of heat from LEDs in LED lamps.

The closest solution to the proposed can be considered a sealed light fixture with LEDs according to the invention patent No. 22448999, IPC: F21V 31/00; priority of March 20, 2005. The device contains a housing made of electrical insulating material, a LED lamp with contact elements of the power supply, and a power source. The disadvantage of this device is its short life due to overheating of the LEDs.

The objective of the proposed device is a significant reduction in thermal resistance of the LED / environment. As a result, the term increases

the service and power of LED lighting devices, and the scope of such devices is expanding (for example, the ability to work at higher temperatures).

To solve the tasks, a lighting device containing an LED that is mounted on a circuit board mounted in the housing, as well as contact elements and a power source, is supplemented with a heat removal unit from the LED. The tap assembly contains a layer of heat-conducting paste, a heat pipe and a radiator.

As a heat pipe, the housing of the lighting device or an independent T-shaped product (in cross section) can be used. The T-shape is used to increase the area of thermal contact between the board with LEDs and the heat conduit. With a large number of LEDs, the heat conduit may consist of several parallel working parts.

A paste layer can be applied between the board and the heat conduit, as well as between the heat conduit and the radiator.

The radiator can have a different design, for example, with longitudinal or transverse ribs (the location of the ribs is selected depending on the location of the lamp in space during operation).

The proposed design improvements make it possible to efficiently take out the heat generated in the LEDs directly from the board on which the LEDs are mounted (the board can be textolite metallized or all-metal made of metal with good thermal conductivity) and transfer this heat through the heat pipe to the radiator located outside the chamber where the LEDs are located lamp. The presence of an effective heat sink allows the use of more powerful LEDs in the lighting device, which helps to increase the power of the light source. Such luminaires can be used to illuminate significantly more voluminous rooms, for which previously LED sources were not applicable.

The proposed device is illustrated by drawings, which show:

Figure 1 - device with a single LED, where the heat pipe is made as an independent product.

Figure 2 - a device with three LEDs and a radiator with longitudinal ribs, the housing is made of a material with good thermal conductivity and therefore serves as a heat conduit.

Figure 3 - a device in which the function of the heat pipe performs a heat pipe.

The lighting device (Figs. 1-3) contains LED 1 (one or more), which are installed on the board 2. On the board 2 can also be mounted contact

elements, a control program block, a power supply, but the installation of this equipment does not fundamentally affect the heat removal scheme and therefore is not shown in the figures.

The back side of the board 2 is covered with a thin layer 6 of heat-conducting paste or glue. For these cases, highly effective pastes or adhesives based on powders of silver, copper, and aluminum are used.

Heat conductive spoil 6 is in contact with heat conduit 7, which is made of materials with high thermal conductivity (copper, aluminum). For LED fixtures of high power or with a significant distance of the LEDs from the radiators, it is proposed to use heat pipes 7A as a heat conduit (Fig. 3). The heat pipe may consist of several parts (figure 3)

The heat pipe 7 through an additional layer 8 of heat-conducting paste is connected to the radiator 9. The radiator can have a different design solution, for example, in the form of a pipe with transverse ribs 10 (Fig.1 and 3) or in the form of a pipe with longitudinal ribs (Fig.2).

LEDs 1, board 2, the first layer of heat-conducting paste 6, as well as part of the heat pipe are placed in the housing 11, which is designed to protect the LEDs from dust, water, mechanical damage.

Perhaps the combination of the functions of the housing and the heat conduit (figure 2).

The proposed design is much more effective than the known ones. In it, heat is removed from the LEDs directly from the metallized board on which they are mounted. Further, the heat leaves through a layer of heat-conducting paste, heat conduit and through a radiator. Around the fins of the radiator there is a constant circulation of air flows due to the movement of layers of air of different temperatures.

Such provision of the heat sink from the LEDs allows the use of more powerful LEDs in the proposed lighting devices (for example: 1 W, 2.5 W, 5 W) instead of the widely used 0.1 W), which were not widely used before, since they quickly failed due to overheating, they required frequent replacement and therefore were uneconomical. High-power luminaires can already be used for lighting large-volume rooms and at higher ambient temperatures. The use of LEDs for such purposes can reduce lighting costs and expand the scope of use of such light sources.

Claims (6)

1. A lighting device comprising an LED that is mounted on a board mounted in the housing, as well as contact elements and a power source, characterized in that it is provided with a heat dissipation unit from the LED, which contains a layer of heat-conducting paste, a heat conductor and a radiator. 2. The lighting device according to claim 1, characterized in that the paste layer is applied between the board and the heat conductor, as well as between the heat conductor and the radiator. 3. The lighting device according to claim 1, characterized in that the housing is a heat conduit. 4. The lighting device according to claim 1, characterized in that the heat pipe is made in a T-shaped section. 5. The lighting device according to claim 1, characterized in that the radiator is made with longitudinal or transverse fins. 6. The lighting device according to claim 1, characterized in that at least two LEDs are mounted in the housing.