RU2707082C2 - Led lamp (embodiments) for lighting of agricultural crops - Google Patents

Abstract

FIELD: lighting.

SUBSTANCE: group of inventions relates to LED lighting fixtures (embodiments) for illuminating agricultural crops. LED lamp comprises radiator housing in the form of longitudinal V-shaped profile of constant cross section along length, with angle α tilting to the horizontal of two faces of the profile, on each of which at least one LED module is placed. In the lighting fixture according to the first embodiment, the LED module is made in the form of a LED matrix, and the matrices are arranged on the profile edges uniformly along its length in a staggered order, differs by the fact that the thickness of the profile walls on each of its cross-section sections obeys the relationship a < b < c where a is thickness of wall of outer section of profile, b is the thickness of the wall of the middle section of the profile in the attachment point of the LED matrix, c is the wall thickness of the central section of the profile. In the lighting fixture according to the second embodiment, the LED module is made in the form of a linear board with a plurality of distributed point light-emitting diode light sources, characterized in that the thickness of the profile walls on each of its cross-section sections obeys the relationship a < b > c, for a < c, where a is the thickness of the wall of the outer section of the profile, b is the thickness of the wall of the middle section of the profile in the attachment point of the LED linear board, and c is the thickness of the wall of the central section of the profile.

EFFECT: technical result is achieving maximum efficiency of heat sink of radiator housing.

2 cl, 4 dwg

Description

The group of inventions relates to lighting technology, namely, to LED lamps and can be used in greenhouse crop production for lighting crops.

As is known from the prior art, the main factors hindering the widespread use of well-known horizontally located LED lighting devices for lateral illumination of plants in greenhouses, provided the lamp housing temperature is comfortable for plants, are:

- insufficient amount of luminous flux of side illumination, which is 80-100 μmol / s per 100 cm of the length of the lamp for the best known analogues, which, in most cases, does not provide economic feasibility of their use;

- a large mass of the device, and therefore the lighting installation as a whole, which increases the load on the supporting structures of the greenhouse;

- a high proportion of the total area of the lighting installation from the area of the greenhouse, which shields natural sunlight;

- the high initial cost of the LED lighting installation, which leads to a long payback period.

These factors are a consequence, including the insufficient heat transfer efficiency of the housing-radiator of the lamp in the environment.

An analogue of the proposed device according to the first embodiment is known as RU 149101 U1, 08.28.2014, “The module of the light-emitting device (device as a whole), the radiator case of the module of the light-emitting device (part of the whole)" [1], consisting of a radiator case and, according to at least one LED module, wherein the radiator case is made in the form of a longitudinal profile of heat-conducting material with a constant cross section in length, characterized in that the radiator case has a radiator base on which a thickening is made in the crepe LED module for quick and even distribution and removal of heat, and LED modules are mounted on a thickened area; the upper part of the radiator case is made in the form of vertically oriented fins of various shapes.

The design of the casing-radiator of the LED lamp has good convection cooling. This is achieved by creating a developed surface of the side walls and cooling fins of the radiator body, but at the same time leads to a large mass of the lamp. And, if for the purpose of lighting industrial and other premises, this parameter is not determining, then when using the well-known analogue for the purpose of lighting plants in a greenhouse, the large mass of the lamp will be its serious drawback.

The closest analogue to the technical result achieved, adopted for the prototype of the proposed device according to the first embodiment, is "LED lighting device" (Patent CN 200982551 (Y) 2007.11.28, IPC F21K 9/00, F21S 4/00, F21V 17/00, F21Y 115/10) [2], comprising a radiator body made of heat-conducting material in the form of a longitudinal V-shaped profile of constant cross section along the length, with an angle “α” of inclination to the horizontal of two profile faces, on each of which at least one LED module made in the form of LEDs one matrix. The specified profile has a horizontal central section, two middle sections with an angle "α" of inclination to the horizontal and two external sections. On the upper side of each section of the profile there are vertically oriented cooling fins.

The advantage of a radiator case in the form of a longitudinal V-shaped profile (in comparison with a profile having a flat horizontal base) is an increase in the efficiency of convective heat removal from the surfaces of the faces of the profile, which is achieved, including by arranging the faces of the profile at an angle α of inclination to the horizontal .

A well-known prototype when used for lighting crops in a greenhouse, including for side lighting inside a bush of plants, will have the following disadvantages:

- insufficient heat transfer efficiency of the radiator body to the environment. This is a consequence of the large difference in surface temperatures of different sections of the radiator profile, since the value of the heat transfer coefficient is proportional to the difference between the ambient temperature and the surface temperature of these sections. In other words, not all surfaces of different sections of the profile are equally effectively involved in the removal of heat into the environment. At the same time, the surface temperature of the external sections of the profile will have the highest temperature (equal to the admissible temperature of the lamp housing that is comfortable for plants) and the highest heat transfer coefficient. The surface temperature of the other two sections of the profile and their heat transfer coefficient, respectively, will be lower;

- the consequence of the desire to increase heat transfer will be the excessive mass of fins of the radiator and the lamp as a whole;

- the presence of a horizontal part in the central section of the profile increases the width of the lamp and, accordingly, increases the area of the lighting installation shielding natural sunlight.

A common disadvantage for analog and prototype is:

- the presence of ribs on the upper surface of the housing. This creates difficulties in cleaning the lamp. Such cleaning is dictated by the need to extend the life of the lamp in a greenhouse with high humidity, fumes and pollution from the vital processes of plants and insects.

The analogue of the proposed device according to the second embodiment is known, a lamp of the same purpose of the Phillips Green Power Interlighting model (http://www.lighting.philips.ru/b-dam/b2b-li/en_AA/products/Horticulture/Horticulture-products/cl- g-led_interlighting-ul-csa-en.pdf, July 24, 2017) [3] containing a profiled body in the form of a pipe of rectangular cross section, also serving as a radiator, two line cards with point LED sources emitting on it are installed on it light in two opposite directions, end caps.

An analogue is also known - a lamp of the same purpose of the Hortiled Inter model (http://www.hortilux.com/products/hortiledr-inter, July 24, 2017) [4], in which a special reflector is provided to provide illumination of plant leaves from above.

The advantages of known analogues [3, 4] with a lamp length of 2.5 m are the small mass of the device - 2.5 / 3.6 kg and small overall dimensions (diameter) of 6.5 / 5.6 cm (respectively).

Their common disadvantage is the insufficient amount of luminous flux of side lighting, which is 80/100 μmol / s per 100 cm of the length of the lamp at a power of 79/95 watts, respectively. At the same time, the working life of the Phillips Green Power Interlighting model according to the manufacturer is 25,000 hours (or 6-7 years), which is not so much. The reason for the low luminous flux and the short life of analogues is the small surface area of heat transfer (only the outer surface) of the luminaire, which does not allow to increase the electric power (luminous flux) of the luminaire, under conditions of such limiting factors as the temperature of the luminaire that is comfortable for plants and its mass and overall dimensions.

Another analog of the same purpose is the Union Power Star-160W-M LED lamp (http://union-ps.com /fitolampa-fitosvetilnik-dlya-teplic.php, http://vegmosreg.ru/upload/medialibrary/ 34f / Miller.pdf, July 24, 2017) [5], comprising a radiator case made of heat-conducting material in the form of a longitudinal hollow 6-tigered profile with a constant cross-section, with an angle of 60 degrees to the horizontal of two profile faces, on each of which contains at least one LED module in the form of a line card with point LED sources, end caps that cover rofil. The power of the lamp is 173 watts, weight 7.5 kg, overall dimensions 250 × 11.4 × 7.1 cm.

The disadvantages of the known analogue are:

- insufficiently efficient heat transfer of the radiator case, due to the fact that the upper edges of the profile are located at a considerable distance from the heat-generating LED modules and all faces of the profile have the same wall thickness. As a result, the temperature of the surfaces and, accordingly, the heat transfer efficiency of the various faces of the profile will vary greatly.

- a large mass of this device, due to the fact that only the external side of the profile is involved in heat transfer to the environment.

Disclosure of the invention.

The group of inventions related to the device is aimed at eliminating the above disadvantages of analogues and prototype associated with insufficient heat transfer from different parts of the surface of the radiator body.

The technical problem solved by the group of inventions is to create a LED lamp with a power of several hundred watts for lateral illumination of a crop.

The technical result of each of the claimed inventions of the group is the maximum heat sink efficiency of the casing-radiator.

The technical result in the proposed device according to the first embodiment is achieved due to the fact that, in contrast to the known LED lamp, which contains a radiator body made of heat-conducting material in the form of a longitudinal V-shaped profile of constant cross section along the length, with an angle α inclined to the horizontal of two faces of the profile, on each of which at least one LED module is placed, made in the form of an LED matrix and the matrix is placed on the faces of the profile evenly along its length in Akhmatically, in the claimed invention there are the following differences:

the wall thickness of the profile in each of the sections of its cross section obeys the dependence a <b <c, where:

a is the wall thickness of the outer section of the profile,

b is the wall thickness of the middle section of the profile at the attachment point of the LED matrix,

C is the wall thickness of the central section of the profile.

Between the set of essential features of the claimed device according to the first embodiment and the achieved technical result (maximum heat sink efficiency of the radiator body), there is a causal relationship, namely:

The implementation of the wall thickness of the profile in each of the sections of its cross-section of the subordinate dependence a <b <c will provide:

- redistribution of the heat flux transmitted by the profile of the LED matrix is approximately proportional to the thickness of the corresponding sections of the profile,

- approximately equal surface temperatures of all sections of the profile and, therefore, approximately equal heat transfer coefficient in all its sections,

величину конвективного теплообмена корпуса-радиатора в целом.-

the magnitude of convective heat transfer of the radiator body as a whole.

Thus, the essential features of the inventive device according to the first embodiment directly positively affect the receipt of a technical result (maximum heat sink heat sink).

The technical result in the proposed device according to the second embodiment is achieved due to the fact that, in contrast to the known LED lamp, which contains a radiator housing made of heat-conducting material in the form of a longitudinal V-shaped profile of constant cross section along the length, with an angle α inclined to the horizontal of two faces of the profile, on each of which at least one LED module is placed, made in the form of line cards with many point LED light sources, in the claimed invention There are the following differences:

the thickness of the walls of the profile in each of the sections of its cross section obeys the dependence a <b> c, for a <c, where:

a is the wall thickness of the outer section of the profile,

b is the wall thickness of the middle section of the profile at the mounting point of the LED line card,

C is the wall thickness of the central section of the profile.

Between the set of essential features of the claimed device according to the second embodiment and the achieved technical result (maximum heat sink efficiency of the radiator body), there is a causal relationship, namely:

The implementation of the wall thickness of the profile in each of the sections of its cross section obeying the dependence a <b> c, with a <c will provide:

- redistribution of the magnitude of the heat flux transmitted to the profile by a linear board, with many point LED light sources, approximately proportional to the thickness of the corresponding sections of the profile,

- approximately equal surface temperatures of all sections of the profile and, therefore, approximately equal heat transfer coefficient in all its sections,

величину конвективного теплообмена корпуса-радиатора в целом.-

the magnitude of convective heat transfer of the radiator body as a whole.

Thus, the essential features of the claimed device according to the second embodiment directly positively affect the receipt of the technical result (maximum heat sink efficiency of the radiator body).

The essence of the group of inventions is illustrated by the graphic materials presented in FIG. 1-4:

FIG. 1. The scheme of heat flows in the cross section of the profile of the casing-radiator according to 1 variant of the lamp.

FIG. 2. The scheme of heat flows on the scan of the lower surface of the profile according to 1 variant of the lamp.

FIG. 3. The scheme of heat fluxes in the cross section of the profile of the casing-radiator according to 2 versions of the lamp.

FIG. 4. The scheme of heat flows on the scan of the lower surface of the profile according to 2 versions of the lamp.

The LED lamp proposed by the group of inventions according to the first embodiment (Fig. 1) comprises a radiator casing made in the form of a longitudinal V-shaped profile 1, with an angle “α” of inclination to the horizontal of two profile faces, each of which has at least one LED module made in the form of LED matrices 2, diffuser 3, the central section 6 of the profile section with the wall thickness “c”, the middle section 5 of the profile section at the mounting point of the LED module with the wall thickness “b”, the outer section 4 of the profile section with the thickness "A" wall.

The device of the invention according to the first embodiment works as follows: The LED module is a light source and at the same time a heat source. The heat flux from the LED matrix by heat transfer in the profile is divided into separate streams in four directions: two sides from the matrix in the middle section 5 along the length of the profile and two sides across the length of the profile - one stream 7 at the nearest external section 4 and the other - stream 9 in the central section 6, then stream 8 in the middle section 5 and then stream 7 in the outer section 4. The magnitude of the heat fluxes 9, 8, 7, in a first approximation, is proportional to the thicknesses “c”, “b”, “a” of the walls of these plots.

In FIG. 2, it is shown that the placement of the LED matrices 2, on the edges of the profile evenly along its length in a checkerboard pattern, creates for each LED matrix its own zone 10 of the heat-transfer surface of the profile.

According to the second embodiment, the device (Fig. 3) comprises a radiator case made in the form of a longitudinal V-shaped profile 1, with an angle “α” of inclination to the horizontal of two profile faces, each of which has at least one LED module made in the form of a linear boards 12 with a plurality of distributed point-wise LED light sources, a diffuser 3, a central section 6 of a section of a profile with a wall thickness “c”, a middle section 5 of a section of a profile with a wall thickness “b” at the mounting point of the LED board, an external section 4 of a section il a thickness "a" wall.

The LED line card 12 is simultaneously a heat source distributed along the profile length. The heat flux from the LED line card 12 by heat transfer is divided into two streams 13 and 14 in separate sections 4, 6 of the cross section of the profile. The magnitude of the heat fluxes 13, 14, in a first approximation, is proportional to the thickness “c” and “a” of the walls of these sections, respectively.

долю потока теплопередачи от светодиодной платы 12 составляет поток 14 по центральному участку 4 профиля.The heat flow diagram (Fig. 4) shows that

the proportion of heat transfer from the LED board 12 is stream 14 in the Central section 4 of the profile.

Further, in the devices (according to the first and second options), heat transfer occurs from the external and internal surfaces of the radiator body to the environment by convection. The redistribution of heat fluxes proposed by the group of inventions in the cross section of the profile of the casing-radiator creates a more uniform temperature field of the surface of various sections of the profile and, as a result, maximizes the efficiency of heat removal of the casing-radiator.

In order to improve convective heat transfer from the inner surface of the radiator casing, through holes 11 are provided in the central section 6 of the profile section through which cool ambient air additionally enters the internal volume of the radiator casing.

The lamp proposed by the group of inventions according to any of the options can be used to illuminate a crop:

1) for overhead lighting of plants - a luminaire with an angle "α" of inclination to the horizontal of two profile faces in the range of 10-30 °;

2) for lateral lighting inside the plant bush - a lamp with an angle "α" of inclination to the horizontal of two profile faces in the range of 30-50 °.

The proposed LED lamp can be made in a wide range of capacities from 20 to 320 watts and a length of 350 to 2500 mm.

Claims (8)

1. An LED lamp comprising a radiator housing made of heat-conducting material in the form of a longitudinal V-shaped profile of constant cross section along the length, with an angle "α" of inclination to the horizontal of two profile faces, on each of which at least one LED module is placed, made in the form of an LED matrix, and the matrix is placed on the edges of the profile evenly along its length in a checkerboard pattern, characterized in that the thickness of the walls of the profile in each of the sections of its cross section obeys the dependence and a <b <c, where a is the wall thickness of the outer section of the profile, b is the wall thickness of the middle section of the profile at the attachment point of the LED matrix, C is the wall thickness of the central section of the profile. 2. An LED lamp comprising a radiator housing made of heat-conducting material in the form of a longitudinal V-shaped profile of constant cross section along the length, with an angle “α” of inclination to the horizontal of two profile faces, on each of which at least one LED module is placed, made in the form of a linear board with many distributed point LED light sources, characterized in that the wall thickness of the profile in each of the sections of its cross section obeys the dependence a <b> c, with a <c, where a is the wall thickness of the outer section of the profile, b is the wall thickness of the middle section of the profile at the mounting point of the LED line card, C is the wall thickness of the central section of the profile.

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