Light diode radiator for plant growing

FIELD: agriculture.

SUBSTANCE: light diode radiator comprises a body from a heat conductive material, at least partially ribbed at the rear side. The body has an outlet hole, which is closed with an optically transparent protective glass or a diffuser. Inside the body there are linear boards installed with assembled groups of light diodes with a different spectrum of radiation in the range of spectral efficiency of photosynthesis /400-700 nm/ with optical axes, facing the outlet hole of the body, and connected to a source of supply. At least on two internal side walls of the concave body there is a cascade of longitudinal plates forming terraces from a heat conductive material, which create ribs of an internal radiator of a conductive heat sink. Longitudinal plates are in thermal contact with body walls and face the outlet hole with a flat part. On each plate there are linear boards /lines/ installed in thermal contact, mostly boards with an aluminium base with high-capacity light diodes or light diode modules, or separate light diodes, which are connected in series or in parallel-serial chains to a source of supply.

EFFECT: design will make it possible to improve thermal and spectral characteristics, to increase density of radiation flow with reduced dimensions of a radiator.

6 cl, 7 dwg

 

The present invention relates to lighting technology, in particular to protected equipment on the basis of LEDs used for growing plants in greenhouses and individual greenhouses.

The irradiator can be used also by irradiation of production areas to improve productivity of livestock and poultry.

The study of the ways of optimizing the parameters of irradiators for crop confirm a significant impact on the productivity of communities, such as vegetables, the spectral composition of radiation in the red, blue and green spectral regions used in greenhouses gas discharge lamps /1/ and offer to replace them with led lights /2/that allows you to control the intensity /amount of exposure and the composition of the emission spectrum of LEDs, allowing for significantly higher yields in a shorter /1.5-2 times/ dates.

However, despite the obvious benefits including lower /3 times/ power consumption compared with the agrarian lamps, hardly a third of the energy input is converted into useful light, and exceed their service life, led emitters have serious disadvantages, caused by the relatively large dimensions, due to the use of the alsogo number of powerful LEDs to obtain the required radiation intensity and unsolved problems cooling irradiators.

When using high power LEDs /1-3 W/placed on a flat finned heat sinks cooling, for example, for General lamps, the distance between the LEDs, including the composition of the line cards or modules, 30-40 mm, which significantly increases the dimensions of the lights. These shortcomings make it difficult simultaneous use in greenhouses sunlight and artificial irradiation plants.

Known led picoprojector /3/ for growing seedlings, vegetables or flowers, comprising a housing made in the form of a rectangular frame defined parallel to the outlet with a gap between a transparent sealed tubular shades, which provide the Board with LEDs with optical axes directed perpendicular to the plane of the outlet of the housing.

In picoprojector cannot be used in high-power LEDs, due to lack of funds conductive heat from the crystals of LEDs arranged in an acrylic pipe-ceiling, eliminating the possibility of obtaining increased intensity of radiation at a considerable acreage of greenhouses and polytunnels.

Known led irradiator for crop /4/containing long rectangular case with side reflectors and installed in the plane, parallel is Noah the outlet line cards with LEDs, connected to the power source, emitting in the blue and red spectral regions, with the optical axes directed perpendicular to the plane of the outlet of the feed.

The disadvantages of the prototype due to the lack of cooling of the LEDs, which complicates the application of high-power LEDs, increasing the number of radiating line cards to obtain the required radiation intensity.

In addition, the irradiator may not provide the desired spectral composition of radiation due to the lack of emission in the green region of the spectrum /500-570 nm/influencing spectral efficiency of photosynthesis.

The aim of the invention is the creation of the led irradiator for growing plants with improved thermal and spectral characteristics, with increased flux density of radiation at a reduced size.

This objective is achieved in that the led irradiator for crop production, comprising a housing of heat-conductive material at least partially fin from the back side, with the outlet blocked optically transparent protective glass or diffuser installed inside line cards collected on them by the groups of LEDs with different emission spectrum in the range of the spectral efficiency of the photos is of NASA /~400-700 nm/ s optical axes, facing the hole, and connected to a power source, at least two inner side walls of the concave body is the cascade forming terraces longitudinal plates made of heat conducting material, creating internal ribs of the heat sink conductive heat sink being in thermal contact with the walls of the casing and facing the flat part to the outlet, each of which is installed in thermal contact line card /line of/mainly Board with aluminum base with powerful LEDs or led modules, or individual LEDs connected in series or parallel-serial chain to the power source.

The objective is achieved by the fact that on the inner side walls of the concave housing made, for example, by the method of pressure casting, the cascade of long steps that are in thermal contact with the walls and creating terraces overlooking the outlet of the longitudinal plate G-shaped profile forming internal ribs of the heat sink conductive heat sink, collected them in thermal contact with the led strips or led modules, or individual LEDs with optical axes directed toward the outlet of the feed.

Target temperature is raised by the COA inner side walls of the concave housing, manufactured mainly by extrusion, made a cascade of long stairs of the internal heat sink conductive heat sink with a longitudinal groove on the side walls, mounted in thermal contact with the fixation in the grooves led strips with aluminum base or rulers of the heat-conducting ceramic material of the type rubalit /Al2O3or alunit /AlN/ collected on them by the LEDs, and on the back of the case is made of longitudinal compartment with the installed power supply and controls the operation modes of the LEDs with the protection of the end parts of the housing and compartment sealed lids.

The problem is solved and the fact that the long concave case is made with a profile in the shape of a trapezoid with the slope of the side walls to the plane of the outlet at an angle not exceeding the angle /90-θ°, where θ is half the angle of radiation used in the irradiator LEDs, but mainly at an angle in the range of 20-40°.

The problem is solved such that at least part of the long flat plates forming ribs cascade internal heat sink conductive heat sink, mounted in the housing with a transverse angle to the plane of the outlet within 6-12° deviation of the optical the fir axes of the LEDs from the normal in the direction predelnoi axis irradiator 00.

The objective is also achieved by the fact that the led bar, led modules, and individual LEDs selected from the dominant wavelength of the LEDs in the ranges of red and red-orange /600-680 them/blue and blue /430-485 nm/ green /500-570 nm/ emission range with a ratio of the output power of the radiation in these spectral ranges mainly as 5:3:2 respectively.

Preferred options led irradiator according to the invention shown in the drawings.

Figure 1. Led irradiator with a cascade of plates G-shaped profile with led strips. Side view, partly in section.

Figure 2. Same as in figure 1, the cross-section.

Figure 3. Same as in figure 1, a front view, partly in section.

Figa and B. Fragments of mounting the led bar or a module on the rung of the housing 1, 2 and 3.

Figure 5. Led irradiator with a cascade of ceramic led strips on the steps of the building, made by extrusion. Side view, partly in section.

6. Same as figure 5, the cross-section.

Shown in figures 1, 2, 5 and 4A and b led irradiator for crop contains mainly long concave body 1 of the heat-conducting material with ribs 2 cooling on the back side and with the outlet blocked convex optically transparent protective glass 3 or diffuser, set in a folding frame with 4 mounting spring locks 5.

The housing 1 is made of aluminum alloy by casting under pressure.

On the inner side and end walls extended concave housing 1 made cascade longitudinal and transverse flat steps 6 and 7 (see figures 1 and 2/, which are in thermal contact with the walls of the stairs longitudinal, T-shaped plates 8, 9 and 10, forming ribs, as well as plate 11 in the transverse rungs of the housing, forming internal ribs of the heat sink conductive heat sink. Each plate side frame 12 (see figure 2 and 4 and the main bearing part 13 adjacent to the walls of the respective steps of the cascade and mechanically clamped thereto by screws 14 and 15, respectively, forming terraces on the side and end walls of the housing 1.

The front supporting part 13 of each plate facing the outlet of the housing, parallel or installed with transverse angle to the plane of the outlet within 6-12° by changing the angle of the stairs cascade /see figb/ in the direction of the longitudinal axis 00 irradiator /see figure 2/, thereby altering the position of the optical axis 0'0' LEDs for redistribution and mixing of the radiation in the outgoing beam irradiator.

On the front supporting part plates 8-11, as well as on the bottom of the hour and the housing 1 are assembled in thermal contact with them line 16, 17, 18, I9 and 20 with LEDs 21, is pressed against the plate by the screws 14.

On the plates 8-11 can be installed also in thermal contact with the led modules or individual LEDs /Fig. not shown/.

Led line or modules executed in the form of long boards mainly with aluminum base or on the basis of heat-conducting ceramics using high-power LEDs /0.5 to 3 W/.

Collected on the strips, modules or individually mounted LEDs 21 have different radiation spectra in the range of spectral efficiency of photosynthesis /~400-700 nm/facing the optical axis 00 0'0' /see figa, b/ C at the outlet of the housing 1 of the irradiator and connected in series or parallel-serial chain to the power source 22 with controls operation modes of the LEDs installed in a protected box 23 with a stub or transit cable glands 24 for connection to the mains supply.

Box 23 is set and sealed at the rear of the chassis and provided with a lyre 25 for mounting irradiator object.

Shown in figure 5 and 6 a second embodiment of the led irradiator for crop production is made in the form of a concave elongated body 26 with outer fins 27, made of heat conducting material, an outlet opening which is blocked by the protective glass 28. On the inner side walls of the housing 26 is made cascade extended steps 29 of the internal heat sink conductive heat sink, with a longitudinal groove 30 on the side walls of each step.

On the front facing to the outlet of each step 29 cascade /see 6/ mounted in thermal contact with her line 31 with LEDs 32, held on the steps by fixing the edges of the strip line in the longitudinal grooves 30 and mechanical pressing to the front steps of the cascade screws 33, as described previously (see figa and 5/ mounting option.

This, along with the use of led modules based boards with aluminum base can be more successfully used long Board 31 on the basis of heat-conducting ceramic material of the type rubalit /Al2O3or alunit /AlN/ surface mounting LEDs due to the intermetallic compound crystal with ceramics.

The housing 26 with a longitudinal compartment 34 to accommodate the power source 35 with controls operation modes of the LEDs 32, for example, by changing the amount of current flowing through the p-n junctions crystals, which determines the radiation intensity or switching led modules, different emission spectrum.

The housing 26 with the cover 34 is made by extrusion followed the th protection of the mechanical parts of the caps 36 through the sealing gaskets 37, protected zirkulatornyi the screen 38.

In this version of the irradiator advantage of the heat-conducting ceramics: electrical insulation, high mechanical strength and chemical stability, allowing to reduce the width of the boards, while improving heat dissipation from the chip led.

Considered options irradiator using flat or G-shaped profile of the extended plates bearing the LEDs or which boards with LEDs and forming ribs cascade internal heat sink conductive heat sink, provide for the fabrication and installation of the fundamental elements of the irradiator in an extended case 1 or 26, is made with a profile in the shape of a trapezoid /shown by the dotted line in figure 2 and 6/ with the slope of the side walls defining the positions of the centers of radiation of the LEDs 21 or 32 to the plane of the outlet of the housing at an angle not exceeding the angle /90-θ°, where θ is half the angle of radiation used in the design of the irradiator LEDs, but mainly at an angle in the range of 20-40°. In this case, losses are minimized radiation on structural elements inside the body using powerful color LEDs with scattering angles mainly within 2θ0,5≅90-140° /5/.

Used in the design of the irradiator led bar,led modules or individual LEDs selected with a dominant wavelength in the range of red and red-orange /600-680 nm/, blue and blue /450-485 nm/ green /500-570 nm/ emission range with a ratio of the output power of the radiation in these spectral ranges mainly as 5:3:2 respectively, it's the closest to the area spectral efficiency of photosynthesis and is the most favorable for plant growth at all stages of development, helping to increase productivity and yield.

Line 16, gathered on the steps of the cascade of two side walls of the casing, and 19, mounted on the plate 11 of the cascade steps 7 /see figure 1/adjacent to the outlet, collected from the LEDs 21 red radiation, for example, family XP7090 firm GREE by more than 1 watt /5/.

On the plates 9 cascade set line 17 with LEDs 21 red-orange radiation of the same family.

The plates 10 and 11 are assembled line of blue and blue, and at the bottom of the hull mounted line 20 with LEDs 21 green radiation of the same family.

The whole line is equipped with mikrorayonami /Fig. not shown/ to connect to each other and to a power source 22.

Instead of the led lines on the plates of the cascade can be installed led module or the individual LEDs in the above sequence of installation colour options.

EN is logically mounted led bar, modules or individual LEDs in the embodiment of the irradiator, is shown in figure 5 and 6.

In the operation of the radiation of the LEDs of red, blue, green, and intermediate colors mixed in the beam emerging from the irradiator, with adjustable intensity and spectral composition.

Variants of designs of led irradiator have significantly improved thermophysical parameters due to the intensification of conductive heat exchange carrier led elements with the environment and provide the possibility of reducing 1.5-2 times the size of the body. At the same time maximize the flux density of radiation and improving the spectral composition of radiation with maximum spectral efficiency of photosynthesis.

Literature

1. Gstaricad. The productivity of communities of cucumbers and tomatoes in function of the spectral characteristics of the WASP. "Lighting", 2001, No. 2, pp. 27-29.

2. Prokofiev and other Prospects for the use of LEDs in crop production. "Semiconductor lighting technology", 2010, No. 5, p.60-63.

3. Patent OF the Russian Federation No. 2369086, CL A01G 9/20, publ. 10.10.2009, bull. No. 28. Led picoprojector.

4. Patent PA PM of the Russian Federation No. 103704, CL A01G 9/26, prior. 28.12.2010 Led irradiator for crop production.

5. The company's catalog "Prosolo", 2009, high-power LEDs GREE.

. Led irradiator for crop production, comprising a housing of heat-conductive material at least partially fin from the back side, with the outlet blocked optically transparent protective glass or diffuser installed inside line cards collected on them by the groups of LEDs with different emission spectrum in the range of spectral efficiency of photosynthesis /400-700 nm/ s optical axis, facing the outlet and connected to a power source, characterized in that at least two inner side walls of the concave body is the cascade forming terraces longitudinal plates made of heat conducting material, creating internal ribs of the heat sink conductive heat sink being in thermal contact with the walls of the casing and facing the flat part to the outlet, each of which is installed in thermal contact line card /line of/mainly Board with aluminum base with powerful LEDs or led modules, or individual LEDs connected in series or parallel-serial chain to the power source.

2. Led irradiator according to claim 1, characterized in that on the inner side walls of the concave housing made, for example, by a method of pouring the pressure made a cascade of long steps that are in thermal contact with the walls and creating terraces facing to the outlet plate G-shaped profile forming internal ribs of the heat sink conductive heat sink, collected them in thermal contact with the led strips or led modules, or individual LEDs with optical axes directed toward the outlet of the feed.

3. Led irradiator according to claim 1, characterized in that on the inner side walls of the concave housing, manufactured mainly by extrusion, made a cascade of long stairs of the internal heat sink conductive heat sink with a longitudinal groove on the side walls, mounted in thermal contact with the fixation in the grooves led strips with aluminum base or rulers of the heat-conducting ceramic material of the type rubalit /Al2O3or alunit /AlN/ collected on them by the LEDs, and on the back of the case is made of longitudinal compartment with the installed power supply and controls the operation modes of the LEDs with the protection of the end parts of the housing and compartment sealed lids.

4. Led irradiator according to claim 1, characterized in that the extended concave case is made with profiling a trapezoid shape with the slope of the side walls to the plane of the outlet at an angle, not exceeding the angle /90°-θ/, where θ is the half angle of radiation used in the irradiator LEDs, and predominantly in the range of 20°-40°.

5. Led irradiator according to claim 1, characterized in that at least part of the long flat plates forming ribs cascade internal heat sink conductive heat sink, mounted in the housing with a transverse angle to the plane of the outlet within 6°-12° deviation of the optical axes of the LEDs from the normal in the direction of the longitudinal axis of the irradiator.

6. Led irradiator according to claim 1, characterized in that the led bar, led modules, and individual LEDs selected from the dominant wavelength of the LEDs in the ranges of red and red-orange /600-680 nm/blue and blue /430-485 nm/ green /500-570 nm/ emission range with a ratio of the output power of the radiation in these spectral ranges mainly as 5:3:2 respectively.



 

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