CN203571485U - LED illumination system with heat recovery function - Google Patents

Abstract

The utility model discloses an LED lighting system with a heat recovery function. The lighting device and the heat recovery device are arranged separately, so that it can be ensured that the LED plane light source, the thermoelectric module and the heat dissipation fins can adapt to the space constraints. The unique arrangement greatly improves the practicability of the lighting system, simplifies the structure of the lighting system, and reduces the volume of the lighting system. By setting the thermoelectric module to absorb the heat generated by the LED planar light source, not only can the efficient heat dissipation of the LED planar light source be realized, but also part of the waste heat can be converted into thermoelectricity, and the electric energy can be output to the grid or energy storage battery through wires for reuse. As an auxiliary power supply for LEDs, it reduces waste of resources. In addition, by setting the cooling fins, the heat exchange area is effectively increased, and the remaining heat can be dissipated as soon as possible to ensure that the lighting system is always kept within the normal temperature range, so as to ensure the luminous quality and service life of the LED planar light source.

Description

A LED lighting system with heat recovery function

technical field

The utility model belongs to the technical field of LED lighting, in particular to an LED lighting system with heat recovery function.

Background technique

In order to improve luminous efficiency and prolong life, high-power light-emitting diodes (LEDs) are gradually replacing incandescent and fluorescent lamps. One of the main advantages of LEDs is their high efficiency. Traditional incandescent and fluorescent lamps have nearly 80% of the electrical energy converted into heat loss, while LEDs only lose 20% or less of heat energy. However, most of the heat generated by incandescent lamps and fluorescent lamps is transmitted to the outside of the bulb in the form of radiation, while a small amount of heat generated by LEDs cannot be transmitted to the outside, so the temperature of the LED lighting system will gradually increase, seriously affecting its luminous efficiency and service life. Therefore, it is necessary to effectively manage the heat of the LED lighting system to ensure its normal use and improve its service life.

At present, LED lights on the market mainly rely on natural heat dissipation. From the perspective of heat transfer, natural heat dissipation uses natural convection and thermal radiation as the basic heat dissipation principles. In natural heat dissipation, the basic idea is to use the outer wall of the lamp, especially the fins to convect the surrounding air and radiate heat to the surrounding objects. This form of heat dissipation relies on the structural form of the lamp itself (such as adding a heat sink) to achieve heat dissipation. The main way to improve the heat dissipation effect is to increase the heat dissipation area and ventilation convection effect and improve the surface radiation coefficient by optimizing the design, but the problems caused by this are to increase the size and cost. According to the survey, a 100W LED lamp requires at least 350 yuan for heat dissipation. And this mode requires very high to the structural form of lamps and lanterns, and outward appearance is bulky, influences attractive in appearance and grade. When the heating power increases, the heat dissipation cost increases sharply and the heat dissipation is limited.

The prior art discloses "an LED lighting device that can realize heat recovery (patent number: 200810017370.0)". The heat dissipation of the heat dissipation fan is controlled by electric energy to realize the heat dissipation of the LED. However, since the thermoelectric conversion device and the heat dissipation fan are integrated with the LED, the structure of the lighting device is relatively complicated, the volume is large, the cost is high, and maintenance and replacement are inconvenient.

In view of the above problems, it is necessary to propose a LED lighting system with heat recovery function to simplify the structure of the lighting system, reduce the overall volume of the lighting system, facilitate the use and operation, realize the full recovery and reuse of the heat generated by the LED, and improve the utilization and reduce cooling costs.

Utility model content

In view of this, the utility model provides an LED lighting system with heat recovery function to simplify the structure of the lighting system, reduce the volume of the lighting system, facilitate the use and operation, and realize the full recovery and reuse of the heat generated by the LED. Improve utilization and reduce cooling costs.

According to the purpose of this utility model, an LED lighting system with heat recovery function is proposed, which includes a lighting device and a heat recovery device, the lighting device is arranged separately from the heat recovery device, and the lighting device and the heat recovery device There are heat pipes connected between them;

The lighting device includes a circuit board, at least one heat dissipation substrate arranged on the circuit board, and an LED planar light source, and the LED planar light source is an LED arranged on the heat dissipation substrate in one-to-one correspondence;

The heat recovery device includes a thermoelectric module and an energy storage unit connected by wires, the heat pipe is in thermal contact with the upper surface of the thermoelectric module to form a hot end, and the lower end of the thermoelectric module is a cold end.

Preferably, the lighting system further includes a heat dissipation device.

Preferably, the heat dissipation device is a heat dissipation fin disposed under the thermoelectric module.

Preferably, the heat dissipation fins are in thermal contact with the lower surface of the thermoelectric module.

Preferably, the heat dissipation fins are composed of multiple U-shaped fins arranged side by side.

Preferably, a through hole is opened on the circuit board, a heat conduction element is connected between the heat dissipation substrate and the heat pipe, and the heat conduction element passes through the through hole.

Preferably, heat transfer oil is provided at the thermal contacts between the components in the lighting system.

Compared with the prior art, the advantage of the LED lighting system with heat recovery function disclosed by the utility model is that by arranging the lighting device and the heat recovery device separately, it can ensure that the LED planar light source, The adaptive arrangement of the thermoelectric module and the cooling fins greatly improves the practicability of the lighting system, simplifies the structure of the lighting system, reduces the overall volume of the lighting system, and is convenient for use and operation. By setting the thermoelectric module to absorb the heat generated by the LED planar light source, not only can the efficient heat dissipation of the LED planar light source be realized, but also part of the waste heat can be converted into thermoelectricity, and the electric energy can be output to the grid or energy storage battery through wires for reuse. As an auxiliary power supply for LEDs, it improves power utilization, reduces waste of resources, and achieves the purpose of energy saving.

In addition, by setting the cooling fins, the heat exchange area is effectively increased, and the remaining heat can be dissipated as soon as possible, so as to ensure that the lighting system is always kept within the normal temperature range, so as to ensure the luminous quality and service life of the LED planar light source.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a perspective view of an LED lighting system with heat recovery function disclosed by the utility model.

Fig. 2 is a top view of an LED lighting system with heat recovery function disclosed by the utility model.

Fig. 3 is a front view of an LED lighting system with heat recovery function disclosed by the utility model.

The names of the corresponding parts represented by numbers or letters in the figure:

1. LED planar light source 2, heat dissipation substrate 3, circuit board 4, heat pipe 5, thermoelectric module 6, heat dissipation fin 7, wire 8, heat conducting material 9, through hole

Detailed ways

At present, LEDs are more and more widely used in the field of lighting, but because the small amount of heat generated by LEDs cannot be transferred to the outside, their luminous efficiency and service life are seriously affected. However, LED lamps on the market mainly rely on natural heat dissipation. When the heating power of this method increases, the cost of heat dissipation increases sharply and the amount of heat dissipation is limited.

In the prior art, "an LED lighting device capable of realizing heat recovery (patent number: 200810017370.0)" is disclosed, which proposes to use a thermoelectric conversion device to recover waste heat, and convert the recovered waste heat into electric energy to control the cooling fan to dissipate heat. However, since the thermoelectric conversion device and the heat dissipation fan are integrated with the LED, the heat dissipation effect is not obvious, and the structure of the lighting device is relatively complicated, the volume is large, the cost is high, and maintenance and replacement are inconvenient.

The utility model aims at the deficiencies in the prior art, and provides an LED lighting system with heat recovery function, so as to simplify the structure of the lighting system, reduce the volume of the lighting system, facilitate the use and operation, and realize sufficient heat recovery of the LED. Recycling and reuse, improve utilization rate, reduce heat dissipation cost.

The technical solutions of the present utility model will be clearly and completely described through specific embodiments below. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to FIG. 1 to FIG. 3 together. FIG. 1 is a perspective view of an LED lighting system with heat recovery function disclosed by the utility model. Fig. 2 is a top view of an LED lighting system with heat recovery function disclosed by the utility model. Fig. 3 is a front view of an LED lighting system with heat recovery function disclosed by the utility model. As shown in the figure, an LED lighting system with heat recovery function includes a lighting device and a heat recovery device, the lighting device and the heat recovery device are arranged separately, and a heat pipe 4 is connected between the lighting device and the heat recovery device, through which the lighting The heat generated in the device is transferred to the heat recovery device for recycling. A liquid-absorbing core is arranged inside the heat pipe 4, and the liquid-absorbing core is filled with a liquid phase-change medium, and the inside of the tube is pumped into a negative pressure seal.

By arranging the lighting device and the heat recovery device separately, it can ensure that the lighting device and the heat recovery device can be arranged adaptively under the condition of limited space, which greatly improves the practicability of the lighting system and simplifies the structure of the lighting system. The overall volume of the lighting system is reduced, which is convenient for use and operation. In addition, the heat generated by the lighting device is effectively recovered to the heat recovery device, thereby improving the effectiveness of heat dissipation.

The lighting device includes a circuit board 3 , at least one heat dissipation substrate 2 arranged on the circuit board 3 , and LED planar light sources 1 . The LED planar light sources 1 are LEDs arranged on the heat dissipation substrate 2 in one-to-one correspondence. The lighting system may include one or more LEDs, and each LED is connected to a heat dissipation substrate and fixed on one or more circuit boards. Each circuit board can be connected to one or more thermoelectric modules through heat pipes. The specific structure is not limited.

There are electrical conductors on the circuit board that provide power to the LEDs, and other electronic components related to the LED planar light source are also fixed on the circuit board. The material of the circuit board can be glass or annular resin, preferably aluminum or other metal printed, so that it has good thermal conductivity. The heat dissipation substrate is generally made of copper or copper alloy. The heat dissipation substrate surrounds the LED plane light source and is in thermal contact with the LED base. It can effectively collect the heat generated by the LED plane light source and transfer it to the heat dissipation substrate to avoid excessive heat concentration and affect the LED. service life.

The heat recovery device includes a thermoelectric module 5 and an energy storage unit (not shown) connected by wires 7 , the heat pipe 4 is in thermal contact with the upper surface of the thermoelectric module 5 to form a hot end, and the lower end of the thermoelectric module is a cold end. By setting the thermoelectric module, the heat dissipation substrate can fully conduct the heat flow of the LED planar light source and absorb it through the heat pipe, and then use the thermoelectric module to convert the heat into electrical energy, which is temporarily stored and converted by the energy storage unit, and then output to provide supplementary electricity for LED lighting .

The lighting system also includes a heat dissipation device, which is a heat dissipation fin 6 arranged under the thermoelectric module 5 . The cooling fins 6 are in thermal contact with the lower surface of the thermoelectric module 5 . By setting cooling fins and increasing the heat exchange area, the remaining heat recovered by the thermoelectric module can be dissipated as soon as possible, ensuring that the LED lighting system is always kept within the normal temperature range, so as to ensure the luminous quality and service life of the LED planar light source.

Wherein, the cooling fins are composed of multiple U-shaped fins arranged side by side. Heat dissipation fins are generally made of metal, metal alloy or thermally conductive polymer material. Considering factors such as cost and efficiency, the heat dissipation fins are made of conventional aluminum heat dissipation fins.

A through hole 9 is opened on the circuit board 3 , a heat conduction element (not shown) is connected between the heat dissipation substrate 2 and the heat pipe 4 , and the heat conduction element passes through the through hole 9 .

By perforating holes on the circuit board, the heat-dissipating substrate is thermally contacted with the heat pipe by means of a heat-conducting member, and the heat collected in the heat-dissipating substrate is transferred out. The upper surface of the thermoelectric module (that is, the hot end) is in thermal contact with the other end of the heat pipe. The heat pipe continuously transfers the heat in the heat dissipation substrate to the upper surface of the thermoelectric module, while the lower surface of the thermoelectric module (that is, the cold end) is in contact with the heat dissipation fins. Thermal contact, so that there will be a temperature difference between the upper and lower surfaces of the thermoelectric module, and a current will be generated in the wire 7 to convert heat energy into electrical energy, and output the electrical energy to the grid or energy storage battery through the wire, which can be used as an auxiliary power supply for LEDs. Wherein, the heat-conducting oil is used as the heat-conducting material in each of the above-mentioned thermal joints to enhance heat transfer.

The thermoelectric module 5 is based on the Seebeck effect (Seebeck effect), that is, in a closed circuit composed of two different metals, if the temperature at the two joints is different, the circuit will generate an electromotive force, and the magnitude of the thermoelectric electromotive force Proportional to the junction temperature difference. The thermoelectric module 5 in the device of the utility model is composed of a semiconductor thermoelectric power generation component, and a commercially available TEC1-03180T125 thermoelectric power generation component can be selected (when the temperature difference reaches 60°C, the power generation voltage can reach 3.5V, and the current can reach 3-5A). Due to the different power of LEDs, the quantity and combination form of the thermoelectric modules 5 and the size, quantity and shape of the cooling fins 6 will vary according to the actual situation.

The working principle of the utility model is as follows:

When the LED lighting system operates with an external power supply, the LED planar light source 1 generates heat and transfers it to the heat dissipation substrate 2 and the circuit board 3, and the heat pipe 4 located under the circuit board 3 absorbs heat and transfers the heat to the top of the thermoelectric module 5 surface. At this time, due to the temperature difference between the upper and lower surfaces of the thermoelectric module 5, a current will appear in the wire 7, and the electric energy will be output to the energy storage unit. The heat that is not fully utilized will be dissipated through the cooling fins 6 on the lower surface of the thermoelectric module.

Compared with the existing lighting device, the system structure of the utility model has the following three advantages:

1. Separate arrangement of LED planar light source, thermoelectric module and cooling fins can realize reasonable layout of LED lighting system in a small space, further expanding the application range of LED lighting system.

2. The heat generated by the LED is transferred to the thermoelectric module through the heat pipe, which can transfer the heat generated by the LED out in time, ensuring that the working environment temperature of the LED planar light source will not increase with the increase of the working time, which greatly improves the LED performance. The service life and luminous efficiency of the planar light source.

3. Use thermoelectric modules to convert waste heat into electrical energy, and the generated electrical energy can be provided to the LED lighting system, which can reduce the overall energy consumption of the lighting system and achieve the purpose of saving energy. Moreover, with the continuous improvement of the thermoelectric conversion efficiency of the thermoelectric module, the energy-saving effect of the LED lighting system of the present invention will be more obvious.

The utility model discloses an LED lighting system with a heat recovery function. The lighting device and the heat recovery device are arranged separately, so that it can be ensured that the LED plane light source, the thermoelectric module and the cooling fins can adapt to the space constraints. The unique arrangement greatly improves the practicability of the lighting system, simplifies the structure of the lighting system, reduces the overall volume of the lighting system, and is easy to use and operate. By setting the thermoelectric module to absorb the heat generated by the LED planar light source, not only can the efficient heat dissipation of the LED planar light source be realized, but also part of the waste heat can be converted into thermoelectricity, and the electric energy can be output to the grid or energy storage battery through wires for reuse. As an auxiliary power supply for LEDs, it improves power utilization, reduces waste of resources, and achieves the purpose of energy saving.

In addition, by setting the cooling fins, the heat exchange area is effectively increased, and the remaining heat can be dissipated as soon as possible, so as to ensure that the lighting system is always kept within the normal temperature range, so as to ensure the luminous quality and service life of the LED planar light source.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. An LED lighting system with heat recovery function, characterized in that it includes a lighting device and a heat recovery device, the lighting device is arranged separately from the heat recovery device, and the lighting device is connected to the heat recovery device There are heat pipes; The lighting device includes a circuit board, at least one heat dissipation substrate arranged on the circuit board, and an LED planar light source, and the LED planar light source is an LED arranged on the heat dissipation substrate in one-to-one correspondence; The heat recovery device includes a thermoelectric module and an energy storage unit connected by wires, the heat pipe is in thermal contact with the upper surface of the thermoelectric module to form a hot end, and the lower end of the thermoelectric module is a cold end. 2. The LED lighting system with heat recovery function according to claim 1, characterized in that, the lighting system further comprises a cooling device. 3. The LED lighting system with heat recovery function according to claim 2, wherein the heat dissipation device is a heat dissipation fin disposed under the thermoelectric module. 4. The LED lighting system with heat recovery function according to claim 3, wherein the heat dissipation fins are in thermal contact with the lower surface of the thermoelectric module. 5. The LED lighting system with heat recovery function according to claim 3, wherein the heat dissipation fins are composed of a plurality of U-shaped fins arranged side by side. 6. The LED lighting system with heat recovery function according to claim 1, wherein a through hole is opened on the circuit board, a heat conducting member is connected between the heat dissipation substrate and the heat pipe, and the heat conducting member through the through hole. 7. The LED lighting system with heat recovery function according to any one of claims 1-6, characterized in that heat transfer oil is provided at the thermal contacts between the components in the lighting system.

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