RU2755678C1 - Led phyto-lamp with cooling system - Google Patents

Abstract

FIELD: lighting engineering.

SUBSTANCE: invention relates to lighting engineering, in particular to lighting devices with high-power LEDs with a cooling device designed for basic lighting during cultivation (growing) of plants in an enclosed space with a controlled environment. The device is a closed liquid cooling system. To remove heat, the LEDs 8 are installed on the cooler 9, which is located inside the housing 6 of the lamp 1. The cooler 9 is connected through the fitting 10 to the pipeline 2, through which the coolant is supplied from the cooling system. The coolant through the pipeline 2 enters the cooler 9, in which it is heated, while cooling the LEDs 8. The heated coolant enters the radiator 3 through the pipeline 2, which is installed outside the module.

EFFECT: improvement in heat removal from the LEDs, an improvement in the emitting characteristics of the LEDs.

1 cl, 4 dwg

Description

The invention relates to lighting engineering, in particular to lighting devices based on powerful LEDs, with a cooling device intended for the main lighting during the cultivation (cultivation) of plants indoors, without sunlight and with a controlled environment.

With the development of science and the emergence of new technologies, phyto-luminaires are being actively developed in lighting, in which LEDs of various colors are used as radiation sources, producing combined light with a spectrum optimized for photosynthesis and photo stimulation of plant growth.

There are various ways to dissipate heat in LED lighting fixtures.

Various methods of heat removal in LED lighting devices are known. Most of them do not spatially separate the heat source (LEDs) and heat dissipation (radiator), so LEDs are usually located on the entire surface of the radiator, and this significantly narrows the functionality of these cooling systems to enhance heat transfer and increase their service life.

Thus, phyto-luminaires on LEDs began to appear, containing a housing with radiation sources, which are blue and red LEDs, and a heat sink made in the form of a radiator, and the heat from the LEDs is transferred to the heat-conducting base, "stretched" over its entire area and then transferred to the radiator (US patent 20070058368, US patent 5278432). The authors of the patent US 6921182 found that a composition composed of blue, orange-red (612 nm) and red (660 nm) LEDs has the best characteristics. It was also recommended to use 12 red LEDs (660 nm), 6 orange (612 nm) and only one blue in the source of phytoactive illumination of plants.

Such phyto-LED luminaires are lighter, safer, have a longer service life and use less energy. However, such phyto-luminaires have the following disadvantages: high power consumption, since they require a voltage converter to operate; uneven illumination due to the lack of lenses on each LED; low heat dissipation, since the heat from the LEDs enters the radiator and is "stretched" over its entire area not evenly, which leads to an increase in the temperature of the luminaire, as well as to uneven illumination.

To improve heat dissipation, phyto-luminaires were developed, in which a channel for forced water cooling was used instead of a radiator to remove heat from the lamps.

Known Linear LED phyto-lamp (patent RU 2709465, IPC F21S 4/24, A01G7 / 0, op. 12/18/2019), containing an aluminum case, an LED strip installed in the lower part of the aluminum case, and a channel for forced water cooling, characterized in that that the aluminum case is made in the form of a Ω (omega) profile, in the lower flat part of which the indicated LED strip is installed, and in the upper rounded part of the profile, along the LED strip, there is a channel for forced water cooling, on the side ends of the aluminum case there are tips made in the form a fitting for cooling water supply with sealing rubber glands for isolating the body of the phyto-lamp, the LED strip contains LEDs of various emission spectra, while a lens is installed on each LED using a holder, creating a light beam with an angle of 60 °. At the same time, the LED strip contains LEDs of the red spectrum, blue spectrum, yellow spectrum and UV spectrum.

The disadvantage of the known technical solution is insufficient heat dissipation, the channel for forced water cooling is located in the middle of the aluminum case and is designed to remove heat not only from the LEDs, but also from the LED control circuit board, which is located on the opposite side of the channel, which leads to an increase in the operating temperature of the phyto-lamp, as well as uneven lighting. Also, the disadvantage of the prototype is uneven illumination, since the presence of light-transmitting glass along the entire LED strip, instead of lenses on each LED, leads to insufficient illumination necessary for the normal course of physiological processes. Another disadvantage of the prototype is the low tightness of the phyto-lamp, since the sealing strip is located on the front side of the LED strip and is designed to seal the LEDs, while there is no channel sealing for forced water cooling. There is also no possibility of connecting cooling systems to the luminaire.

Known LED lamp with liquid cooling (patent RU 125300, IPC F21S 15/00, publ. 02/27/2013), containing a body made of heat-conducting material, equipped with ribs installed on three sides around its perimeter, and filled with a heat-dissipating liquid, a light source presented LED strip protected by an optically transparent diffuser made of glassy material, hermetically sealed cover and opening for filling liquid, characterized in that the internal volume of the case is divided into three compartments by two longitudinally oriented strips of material with low thermal conductivity, installed with gaps relative to the end walls of the case , the light source is mounted in the center of the outer part of the housing base directly or through the printed circuit board with orientation in the longitudinal direction, the cover is provided with ribs located at an acute angle to its longitudinal axis. Antifreeze is used as a heat-dissipating fluid.

The disadvantages of the known technical solution include the fact that the lamp is made with a closed system of heat redistribution and uniform air cooling of the body, not connected to the active cooling system.

Closest to the proposed invention is a LED lighting device (RU, No. 103596 U1, F21S 10/00), taken as a prototype. The lighting device contains a heat transfer system made in the form of a sealed chamber, partially filled with a coolant (for example, water, alcohol, acetone, etc.) A heat-dissipating metal substrate with LEDs is mounted on the lower outer surface of the chamber. The side surface of the chamber is provided with ribs and serves as a radiator. For the circulation of the coolant, either gravitational forces or the capillary structure of the inner surface of the chamber are used, depending on the location of the metal substrate with LEDs.

The disadvantage of the described structures is the possibility of overheating under certain weather conditions, and, as a consequence, the failure of the luminaire.

The difference between this solution is that there is a liquid inside the body of a known lamp, which, when the LED is heated, begins to circulate inside the lamp body to efficiently transfer heat to the lamp body, which in turn is cooled by air around the lamp and does not provide heat removal from the room where it is installed.

The invention solves the problem of efficient heat removal from LEDs to increase their service life; it does not solve the problem of heat removal from the room where it is installed.

The objective of the present invention is to simplify the design of the LED lighting device while increasing the efficiency of heat removal from the LEDs, reducing energy consumption and increasing the service life of the lighting device.

The technical result of the claimed invention is to improve the heat removal from LEDs, improve the emitting characteristics of LEDs.

The claimed technical result is achieved due to the fact that a LED phyto-lamp with a cooling system, which is a closed system in the form of a sealed circuit for circulating a liquid coolant through it, including a body made of a heat-conducting material for filling with a heat-removing liquid, LEDs covered with optical transparent lenses and connected to the unit power supply, radiator, power supply unit, which is equipped with functional sensors that provide the functions of control, monitoring and reliability of the system in certain climatic conditions, according to the invention, the sealed circuit contains a cooler installed inside the lamp housing, a pipeline to which the cooler is connected through a fitting, a radiator with forced cooling by a fan, a pipeline for transporting the coolant to the radiator, a distribution manifold, a pump for circulating the coolant, while the LEDs are installed on the cooler, which is located inside In the case, the radiator is installed outside the sealed circuit.

A distinctive feature of the invention is as follows:

- in the known technical solutions, a closed autonomous system is used, the liquid is used only to transport heat to the lamp body, which is cooled by air;

- there is a liquid inside the luminaire body, which, when the LED is heated, begins to circulate inside the luminaire body for efficient heat transfer to the luminaire body, which in turn cools the air around the luminaire and does not provide heat removal from the room where it is installed;

- the invention uses a set of devices that provide the supply of a cooling medium to the LEDs of the luminaire and the removal of excess heat from them and from the room where they are installed, which should provide the greatest degree of cooling and the ability to maintain the thermal state of the luminaire within the required limits under various operating modes and conditions.

- to improve heat dissipation in the known technical solutions, phyto-lamps have been developed, in which a channel for forced water cooling was used instead of a radiator to remove heat from the lamps. The function of a radiator in the illumination device is performed by the side surface of the camera, free from LEDs.

The essence of the invention is illustrated by drawings, where:

fig. 1 shows an LED phyto lamp with a cooling system, general view;

fig. 2 - the same, LED phyto lamp, general view;

fig. 3 - the same, LED phyto-lamp, section;

fig. 4 - the same, LED phyto-lamp, side view.

Positions indicate: LED phyto lamp 1; pipeline 2; radiator 3; pump 4; distribution comb 5; body 6 of lamp 1, lens of LED 7, LED 8, cooler 9, cooler connection 10.

The device is a closed liquid cooling system.

LEDs 8, when glowing, emit a large amount of heat, phyto-lamp 1 serves as lighting for plant growth in modules, which is any room with a controlled environment (temperature, humidity), equipped for cultivating plants, the temperature in which is very important for normal growth and should be in aisles not higher than 18-22 degrees. To remove heat, the LEDs 8 are installed on a cooler 9, which is located inside the housing 6 of the lamp 1. The cooler 9 is connected through the fitting 10 to the pipeline 2, through which the coolant is supplied from the cooling system. The coolant through the pipeline 2 enters the cooler 9, in which it heats up and cools the LEDs 8. The heated coolant flows through the pipeline 2 to the radiator 3, which is installed outside the module.

The device works as follows.

LED phyto-lamp 1 is placed above the surface of the area with grown plants, setting it at a selected height. When power is applied, all LEDs emit light. Depending on the selected surface of the site for the grown plants (greenhouses, greenhouses, conservatories, agro-industrial complexes, or home conditions), the required number of phyto lamps is selected.

The system circulates a liquid coolant along a sealed circuit, heating up from a heat source - a cooler 9 installed in the housing 6 of the lamp 1, on which LEDs 8 are installed, and cooling down in a cooling circuit - a radiator 3 with forced cooling by a fan, which is installed in another room or on open air. LEDs 8, installed on cooler 9, transfer heat to the liquid coolant, which, through the fitting 10 through pipeline 2, is transported to the radiator 3, in which it is cooled to a predetermined temperature, controlled by a thermostat (not shown) and enters the liquid cooling system with a temperature not lower than + 15 ° C to prevent condensation after cooling. The liquid heat carrier through the pipeline 2 enters the distribution manifold 5, which is used to transport the liquid along the consumption circuits. With the help of comb 5, the coolant is distributed to each LED phyto-lamp, and enters the cooler 9 of the lamp through the fitting 10. The circulation of the coolant is provided by the pump 4.

An example of the application of the invention.

To implement the cooling process of phyto-lamps, the following technical means, sensors and actuators are installed:

1) Temperature controller, for example, two-channel with RS-485 ТРМ202-Щ2.РР.

2) Resistance thermometer, for example, TC054-Pt100.B3.100 / 2 - Temperature sensor with cable (Pt100, L = 100 mm, d = 6 mm, M16 × 1, 5, (-50 ... + 250 ° С).

3) Circulation pump for heating, for example, Compass 25/40, DZHILEKS.

4) Engine radiator, complete with fan 12V 16400-28350.

5) DENDOR Solenoid valve Vp-IA-15-n / c-V-Z2-B normally closed.

When the lamps are turned on at a specified time from 6:00 am to 01:00 am (a bio-day for plants is provided), circulation pump 4 is turned on (see "Functional diagram of automation. Cooling of phyto-lamps), the coolant moves along a small circuit inside the room, provided that the temperature value is in the range from 17 ° C - 21 ° C, the first valve (not shown) is open, the other valve is closed, the cooling radiator 3 is turned off.

When the temperature of the coolant is above 21 ° C, the first valve closes, the other valve opens and the cooling fan motor starts. Cooling of the coolant occurs along a large cooling circuit, cooling occurs to a set temperature of 17 ° C.

Claims (1)

LED phyto-lamp with a cooling system, which is a closed system in the form of a sealed circuit for circulating a liquid heat carrier through it, including a body made of a heat-conducting material for filling with a heat-removing liquid, LEDs covered with optical transparent lenses and connected to a power supply unit, a radiator, a power supply unit that is equipped with functional sensors providing control, monitoring and reliability functions of the system in certain climatic conditions, characterized in that it contains a cooler installed inside the luminaire body, a pipeline to which the cooler is connected through a fitting, a radiator with forced cooling by a fan, a pipeline for transporting a liquid coolant to the radiator , a distribution comb, a pump for circulating a liquid heat carrier, while the LEDs are installed on the cooler, which is located inside the case, the radiator is installed outside the sealed circuit.

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