Note: Descriptions are shown in the official language in which they were submitted.
RADIATOR AND PLANT ILLUMINATION LAMP
Technical Field
The present invention relates to the field of heat radiation, and particularly
to a radiator
and a plant illumination lamp containing the radiator.
Background
The plant illumination lamp, as the name implies, is a luminaire used for
plants. The plant
illumination lamp simulates sunlight based on the principle that plants need
sunlight for
photosynthesis, and provides supplementary lighting or completely replaces the
sunlight for
plants. Accordingly, the light source of the plant illumination lamp has a
relatively larger
illumination, which is several times of the illumination of the ordinary desk
lamp and has a
value up to several thousands. Thus, a single lamp of the plant illumination
lamp has a very
high power, and there is a high requirement for the heat radiation performance
of the lamp.
At present, the structure of the radiator provided in the plant illumination
lamp is shown
in Fig. 1. The radiator 100 has a substantially U-shaped cross section, and
the radiator 100
includes a heat-radiating baseplate 101 extending horizontally, heat-radiating
side plates 102
configured at both ends of the heat-radiating baseplate 101 in the width
direction and extending
vertically. The heat-radiating baseplate 101 is connected to the lamp housing
of the plant
illumination lamp to perform the heat conduction, and heat is radiated through
the heat-
radiating baseplate 101 and the heat-radiating side plates 102.
Further, the amount of heat exchanged by the radiator is Q=h*A*AT, where h is
a heat
exchange coefficient (usually ranges 4-20), A is the total area of the
radiator involving in the
heat exchange, and AT is the temperature difference between the heat source
and the medium.
In the radiator having the above structure, the total area A is increased with
the configuration
of the heat-radiating side plates 102. However, in the radiator having the
above structure, the
convection efficiency of the hot and cold air is very poor, and the effective
heat radiation area
is small, so that the heat exchange coefficient h is small. In the most cases,
the heat exchange
coefficient h is equal to 4 or slightly greater than 4. Therefore, the design
of the radiator
available now overly focuses on the total area A involving in the heat
exchange while ignoring
the improvement of the value of the heat exchange coefficient h. As a result,
the heat radiation
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performance of the radiator is not the optimal, and the heat radiation
requirements of the plant
illumination lamp cannot be fully satisfied.
Summary
In view of the above-described drawbacks of the prior art, the objective of
the present
invention is to provide a radiator capable of greatly increasing the value of
the heat exchange
coefficient h and the effective heat radiation area.
To achieve the above objective, the present invention provides a radiator,
including a heat-
radiating baseplate configured for fixing a heat source, and heat-radiating
side plates connected
to the heat-radiating baseplate. The heat-radiating side plates are provided
with a plurality of
heat-exchanging through grooves running through the heat-radiating side
plates.
Further, the heat-radiating side plates are arranged on two sides of the heat-
radiating
baseplate; and the heat-radiating side plates are provided with a plurality of
heat-radiating fins.
Further, the heat-radiating fins are integrally formed on the heat-radiating
side plates by a
punching method. After the heat-radiating side plates are punched, torn
portions caused by
punching and through-groove portions in a one-to-one correspondence with the
torn portions
are formed on the heat-radiating side plates. The torn portions form the heat-
radiating fins, and
the through-groove portions form the heat-exchanging through grooves.
Further, the heat-radiating fins protrude from the heat-radiating side plates,
and the heat-
exchanging through grooves are formed between the heat-radiating side plates
and the heat-
radiating fins.
Further, in the plurality of heat-radiating fins, a part of the heat-radiating
tins protrude
inwardly from the heat-radiating side plates, and another part of the heat-
radiating fins protrude
outwardly from the heat-radiating side plates.
Further, the heat-radiating fins each include a fin bottom located at a middle
of the heat-
radiating fin and extending straightly, and a fin slanted plate portion
extending obliquely from
both ends of the fin bottom. One end of the fin slanted plate portion away
from the fin bottom
is connected to the heat-radiating side plates. The fin bottom is in a flat
plate shape or an arc
plate shape.
Further, when the radiator is used in a lamp, the heat-radiating baseplate is
integrally
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provided with a reflector. The heat-radiating baseplate and the reflector
constitute a lamp
housing for the lamp and form a light source cavity of the lamp.
Further, the heat-radiating side plates are integrally connected to the heat-
radiating
baseplate, and the radiator is an extruded aluminum profile or a bent plate.
The present application further provides a plant illumination lamp which
includes a lamp
housing having a light source cavity, a light source mounted in the lamp
housing and located
in the light source cavity, and the radiator as described above. The radiator
is mounted at an
upper end of the lamp housing.
Further, the lamp housing and the radiator form an integral structure. The
lamp housing
and the radiator share the heat-radiating baseplate; and the light source is
mounted on the heat-
radiating baseplate.
As described above, according to the present invention, the radiator and the
plant
illumination lamp have the following advantages.
In the present application, the heat-exchanging through grooves form a heat
exchange
channel for the internal-and-external temperature difference of the radiator,
i.e., form a heat
potential difference. As a result, the cold air outside the radiator would
pass through the heat-
exchanging through grooves on the heat-radiating side plates under the
influence of the heat
potential difference and then flow out through a hot air chamber and an air
outlet mounted at
an upper end of the hot air chamber after exchanging heat with the through
grooves on the heat-
radiating side plates, so as to form a stronger natural air convection.
Therefore, the value of the
heat exchange coefficient h of the radiator at the position near the heat-
exchanging through
grooves is improved by 4-6 times higher than that of the radiator without heat-
exchanging
through grooves. Moreover, the heat-exchanging through grooves increase the
effective heat
radiation area of the radiator during the processing, thereby greatly
improving the heat radiation
capability of the radiator, so that the heat radiation requirements of the
plant illumination lamp
can be satisfied.
Brief Description of the Drawings
Fig. 1 is a structural schematic diagram of a radiator in the prior art.
Fig. 2 is a structural schematic diagram of a radiator in the present
invention.
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Fig. 3 is a partially enlarged view of Fig. 2.
Fig. 4 is a cross-sectional view of the radiator of Fig. 2 at a position of
the heat-exchanging
through groove.
Fig. 5 is a structural schematic diagram of Embodiment 1 of the plant
illumination lamp
of the present application.
Fig. 6 is a structural schematic diagram of Embodiment 2 of a plant
illumination lamp of
the present application.
Fig. 7 is a cross-sectional view of a plant illumination lamp of the present
application at a
position of the heat-exchanging through groove of a radiator.
Figs. 8 -10 are schematic diagrams showing airflow of a radiator at different
viewing
angles.
Fig. 11 is a diagram showing the comparison of heat exchange coefficient and
temperature
of a radiator of the present application.
Fig. 12 is a diagram showing the comparison of heat exchange coefficient and
temperature
of a radiator of the prior art.
Description of the reference designators of the components
1. heat-radiating baseplate;
2. heat-radiating side plate;
21. heat-exchanging through groove
22. heat-radiating fin
221. fin bottom
222. fin slanted plate portion
23. mounting groove
3. hot air chamber
4. inner cavity
5. air outlet
6. reflector
61. fixing slot
7. light source cavity
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8. light source
9. lampshade
10. end cover
11. hook
12. lifting rope
13. beam
14. threaded hole
Detailed Description of the Embodiments
The implementations of the present invention are described hereinafter through
specific
embodiments. Those skilled in the art can readily learn other advantages and
functions of the
present invention from the disclosure in the specification.
It should be noted that the structure, proportion, size, etc. depicted in the
drawings of the
specification are merely intended to match the contents disclosed in the
specification for person
familiar with this technology to understand and read, rather than to limit the
implementation
requirements of the present invention, and therefore have no technical
significance. Any
modifications of the structure, variations of the proportional relationship,
or adjustments of the
size not affecting the desired function and purpose of the present invention
shall be considered
as falling within the scope of the technical contents disclosed by the present
invention.
Meanwhile, the terms such as "upper", "lower", "left", "right", "middle",
"one", etc. recited in
the specification are merely intended to create clear description rather than
limit implementable
scope of the present invention. Variations or adjustments to the relative
relationship, without
substantial variation of the technical contents, should also be considered as
falling within the
implementable scope of the present invention.
For the convenience of description, in the following embodiments, the width
direction of
the heat-radiating baseplate 1 in the radiator is defined as the left-right
direction, the length
direction of the heat-radiating baseplate 1 is defined as the front-rear
direction, and the
thickness direction of the heat-radiating baseplate 1 is defined as the up-
down direction.
Moreover, the left-right direction, the front-rear direction, and the up-down
direction also refer
to the width direction, the length direction, and the height direction of the
radiator, respectively.
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i As shown in Figs. 2-4, the present application provides a radiator which
includes the heat-
radiating baseplate I configured for fixing a heat source, and heat-radiating
side plates 2
connected to the heat-radiating baseplate I. The heat-radiating side plates 2
are provided with
a plurality of heat-exchanging through grooves 21 running through the heat-
radiating side
plates 2. Preferably, the heat-radiating side plates 2 are arranged on two
sides of the heat-
radiating baseplate 1, particularly on the edges of the heat-radiating
baseplate 1. The heat-
radiating side plates 2 may extend straightly along a plane where the heat-
radiating baseplate
1 is located. In this case, the heat-radiating side plates 2 and the heat-
radiating baseplate 1 come
from one flat plate. Or, the heat-radiating side plates 2 may extend in a
direction perpendicular
to the heat-radiating baseplate 1. In the radiator shown in Figs. 2-4, the
heat-radiating side
plates 2 are arranged at left and right ends of the heat-radiating baseplate 1
along the width
direction of the heat-radiating baseplate 1. A hot air chamber is formed
between the heat-
radiating baseplate 1 and the heat-radiating side plates 2. An air outlet 5
located at an upper
end of the hot air chamber 3 is formed between the upper ends of the two heat-
radiating side
plates 2. The heat-radiating baseplate 1 extends forward and backward in a
horizontal direction
and is a transverse plate. The heat-radiating side plates 2 extend forward and
backward in a
vertical direction and are vertical plates. Specifically, a plurality of heat-
exchanging through
grooves 21 run through the heat-radiating side plates 2 between the left and
right sides along
the width direction of the heat-radiating baseplate 1, so that each of the
heat-exchanging
through grooves 21 communicates with the outside of the radiator and the hot
air chamber 3.
The heat-exchanging through grooves 21, the hot air chamber 3, and the air
outlet 5 are
sequentially interconnected to each other to form air convection channels of
the radiator. In
addition, the heat-exchanging through grooves 21 are longitudinal elongated
grooves extending
upward and downward, and the plurality of heat-exchanging through grooves 21
are
equidistantly arranged forward and backward along the length direction of the
heat-radiating
side plates 2.
The radiator can be used in lamps, computers, or fans, etc. When the radiator
is used in a
lamp, the lamp may be a household lamp, a street lamp, or a plant illumination
lamp, etc. As
shown in Figs. 5 and 7, or Figs. 6 and 7, the plant illumination lamp having
an elongated
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1111
structure extending forward and backward includes a lamp housing, the light
source 8 mounted
on the lamp housing, the lampshade 9 mounted on a lower end of the lamp
housing, end covers
mounted on the front and rear ends of the lamp housing, and the radiator as
described above.
The lampshade 9 may be made of transparent glass. The closed light source
cavity 7 is formed
by the lamp housing, the lampshade 9, and the two end covers 10. The light
source 8 is located
in the light source cavity 7, and the light source 8 functions as a heat
source of the plant
illumination lamp. The radiator is mounted on the upper end of the lamp
housing.
In the radiator and the plant illumination lamp containing the radiator of the
present
application, when the air in the hot air chamber is heated up, the heat-
exchanging through
groove 21 forms a heat exchange channel for the internal-and-external
temperature difference
of the radiator, i.e., forms a heat potential difference. As a result, under
the influence of the
heat potential difference, the cold air outside the radiator passes through
the heat-exchanging
through grooves 21 on the heat-radiating side plates 2 to exchange heat with
the hot air in the
hot air chamber 3 inside the radiator. As shown in Figs. 8-10, the cold air
outside the radiator
passes through the radiator via the heat-exchanging through groove 21 and
flows into the hot
air chamber 3 for supplement and exchanging heat with the heat-exchanging
through groove
21 on the heat-radiating side plates 2. The air then flows out through the hot
air chamber 3 and
an air outlet 5 mounted at an upper end of the hot air chamber 3 to form a
strong natural air
convection. The cold air from the outside is continuously fed, the hot air
from the interior is
continuously discharged, and the circulation of the air takes away the heat in
the hot air
chamber 3. Therefore, the heat-exchanging through groove 21 provides a good
channel for the
cold air entering the radiator, and the convection efficiency of the hot and
cold air near the
heat-exchanging through groove 21 of the radiator is very high. Thus, the
value of the heat
exchange coefficient h of the heat-exchanging through groove 21 of the
radiator is improved
to 4-6 times higher than that of the radiator without heat-exchanging through
groove. Moreover,
the heat-exchanging through groove increases the effective heat radiation area
of the radiator
during the processing, and thus increases the amount of heat Q exchanged by
the radiator,
thereby greatly improving the heat radiation capability of the radiator and
meeting the heat
radiation requirements of the plant illumination lamp.
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1111
Further, the heat-radiating side plates 2 of the radiator is integrally
connected to the heat-
radiating baseplate 1 for fixing the light source. The heat-radiating
baseplate 1 and the heat-
radiating side plates 2 constitute a radiator body having a U-shaped
structure. The radiator body
can be formed by extrusion or by a bending method, and the length of the
radiator body can be
cut according to actual demands. As shown in figs. 3 and 4, each heat-
radiating side plate is
provided with a plurality of heat-radiating fins 22. Each of the heat-
radiating fins 22 is a
longitudinal elongated structure extending upward and downward. The plurality
of heat-
radiating fins 22 are equidistantly arranged with a predetermined interval
along the length
direction of the heat-radiating side plates 2, so the heat-radiating fins 22
can increase the heat
radiation surface area of the radiator, which facilitates the heat radiation.
Preferably, the heat-
radiating fins 22 are formed on the heat-radiating side plates 2 by a punching
method, so that
the heat-radiating fins 22 and the heat-radiating side plates 2 form an
integral structure.
Moreover, after being punched, the heat-radiating side plates 2 each forms
torn portions caused
by punching and through-groove portions in one-to-one correspondence with the
torn portions.
The torn portions form the heat-radiating fins 22, and the through-groove
portions form the
heat-exchanging through grooves 21. Adopting this structure, the following
advantages can be
obtained. I. The heat-radiating fins 22 and the radiator body form an integral
structure to
facilitate the heat conduction, so the heat emitted by the heat source is
transmitted to the heat-
radiating fins 22 with a minimum thermal resistance along the longitudinal
direction. 2. The
longitudinal heat-radiating fins 22 are formed by the punching process and the
longitudinal
heat-exchanging through grooves 21 are in one-to-one correspondence with the
longitudinal
heat-radiating fins 22. In one aspect, a new heat exchange surface is formed
on the offset
surface at the heat-exchanging through grooves 21, which increases the heat
radiation area
without increasing the use of any material, so the material cost and weight of
the radiator are
not increased. In the other aspect, the longitudinally punched end faces form
a heat potential
difference through the heat-exchanging through grooves 21, so as to provide a
good channel
for external cold air to pass through the radiator. The external cold air is
driven by the thermal
force to flow and circulate in the channel formed by heat-exchanging through
grooves 21 in an
unimpeded manner, forming a strong natural air convection, and thereby
effectively increasing
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the value of the heat exchange coefficient h of the radiator. The value of the
heat exchange
coefficient h can be increased to 12, 15 or above. Moreover, the external cold
air and the heat-
radiating fins 22 have a large contact area, which increases the effective
heat radiation area of
the radiator, and achieves the heat radiation capability for a higher power
with limited materials.
More specifically, Fig. 11 shows the comparison of heat exchange coefficient
and temperature
of the radiator having the heat-exchanging through grooves 21 and the heat-
radiating fins 22
in the present application. Fig. 12 shows the comparison of heat exchange
coefficient and
temperature of a radiator without the heat-exchanging through grooves 21 and
the heat-
radiating fins 22 in the prior art. Comparing Fig. 11 with Fig. 12, it can be
seen that, in the case
where the heat sources have the same power and the radiators have the same
size, compared
with the radiator not provided with the heat-exchanging through grooves 21 and
the heat-
radiating fins 22, the heat exchange coefficient and temperature of the
radiator provided with
the heat-exchanging through grooves 21 and the heat-radiating fins 22 are
significantly
different. In this Embodiment, the power of the heat source is 200 W, and the
outer dimension
of the radiator is 60 mm width * 50 mm height * 1200 mm length, and the wall
thickness of
the radiator is 2.5 mm.
Further, when performing the punching process to form the heat-radiating fins
22, the
heat-radiating side plates 2 may be punched inwardly to form the heat-
radiating fins 22, or the
heat-radiating side plates 2 may be punched outwardly to form the heat-
radiating fins 22. When
the heat-radiating side plates 2 are punched inwardly to form the heat-
radiating fins 22, as
shown in Figs 3 and 4, the heat-radiating fins 22 protrude inwardly from the
heat radiation side
plates 2 and are located inside the heat-radiating side plates 2, so the heat-
radiating fins 22 are
also located at the inner side of the hot air chamber 3. In this case, the
heat-exchanging through
grooves 21 are formed between the heat-radiating fins 22 and the heat-
radiating side plates 2.
An inner cavity 4 intercommunicated in front and rear sides that communicates
with the hot air
chamber 3 is formed between the heat-radiating fins 22 and the heat-radiating
side plates 2.
The heat-exchanging through grooves 21 communicate with the hot air chamber 3
through the
inner cavity 4. The direction of air convection is as follows. As shown in
Figs.8-10, the external
cold air flows into the hot air cavity 3 after successively passing through
the heat-exchanging
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through grooves 21 and the inner cavity 4 from different directions, and the
air after heat
exchange flows out from the air outlet 5 at the upper end of the hot air
chamber 3, so as to
provide a high cooling efficiency. When the heat-radiating side plates 2 are
punched outwardly
to form the heat-radiating fins 22, the heat-radiating fins 22 protrude
outwardly from the heat
radiation side plates 2 and are located at the outer side the heat-radiating
side plates 2. The
heat-exchanging through grooves 21 are formed between the heat-radiating fins
22 and the
heat-radiating side plates 2. An outer cavity intercommunicated in front and
rear sides that
communicates with the outside of the radiator is formed between the heat-
radiating fins 22 and
the heat-radiating side plates 2. The outer cavity communicates with the hot
air chamber 3
through the heat-exchanging through grooves 21. The direction of air
convection is as follows.
The external cold air flows into the hot air cavity 3 after successively
passing through the outer
cavity and heat-exchanging through grooves 21 from different directions, and
the air after heat
exchange flows out from the air outlet 5 at the upper end of the hot air
chamber 3, so as to
provide a high cooling efficiency. Among the plurality of heat-radiating fins
22 of the heat-
radiating side plates 2, the plurality of heat-radiating fins 22 may all
protrude inwardly from
the heat-radiating side plates 2, may all protrude outwardly from the heat-
radiating side plates
2, or may partially protrude inwardly from the heat-radiating side plates 2
and partially protrude
outwardly from the heat-radiating side plates 2, simultaneously. In addition,
a preferred
structure of the heat-radiating fins 22 is described as follows. As shown in
Fig. 4, the heat-
radiating fins 22 each includes the fin bottom 221 located in a middle and
extending straightly,
and the fin slanted plate portion 222 extending obliquely from both ends of
the fin bottom 221.
One end of the fin slanted plate portion 222 away from the fin bottom 221 is
connected to the
heat-radiating side plates 2. The fin bottom 221 has a flat plate shape, an
arc plate shape, or
other shape, which can effectively increase the heat radiation surface area of
the heat-radiating
fins 22 and facilitate the heat radiation.
In order to achieve the effective heat radiation of the radiator, the plant
illumination lamp
provided with the radiator should be installed in a suspended manner, so that
the upper part of
the hot air chamber 3 in the radiator is suspended to form an air circulation
channel. The
suspended installation of the plant illumination lamp can be achieved through
mounting slots
CA 3043076 2019-05-13
23 provided on the heat-radiating side plates 2 and additional hooks 11. Two
preferred
embodiments are listed below. Embodiment 1: as shown in Fig. 5, the front and
rear ends of
the heat-radiating side plates 2 are provided with mounting slots 23
intercommunicated in front
and rear sides. Two hooks 11 are provided and are respectively connected to
the mounting slots
23 at the front and rear ends of the radiator. The upper ends of the hooks 11
are connected to
lifting ropes 12, and the lifting ropes 12 can be connected to the ceiling to
realize a non-ceiling-
mounted installation of the plant illumination lamp. Embodiment 2: as shown in
Fig. 6, the
front and rear ends of the heat-radiating side plates 2 are provided with
mounting slots 23
intercommunicated in front and rear sides. Two hooks 11 are provided and are
respectively
connected to the mounting slots 23 at the front and rear ends of the radiator.
The hooks 11 are
hang on the beam 13 or a frame, and there is a space left between the beam 13
and the radiator
or between the frame and the radiator to achieve a non-ceiling-mounted
installation of the plant
illumination lamp. The above two structures make the installation and
disassembly of plant
illumination lamp very convenient and easy to operate.
Further, as shown in Fig. 7, the lamp housing and the radiator in the plant
illumination
lamp form an integral structure. The lamp housing and the radiator share the
heat-radiating
baseplate 1. The light source 8 is mounted on a lower end surface of the heat-
radiating baseplate
1, and the hot air chamber 3 is formed above the upper surface of the heat-
radiating baseplate
1, which greatly reduces the thermal resistance and facilitates the heat
radiation. A preferred
structure of the lamp housing is as follows. The lamp housing is integrally
provided with two
reflectors 6 arranged symmetrically at the left and right on the heat-
radiating baseplate 1, and
the two reflectors 6 both extend forward and backward. The inner surface of
the reflector 6 is
provided with the fixing slot 61, and the left and right edges of the
lampshade 9 are respectively
fixed in the fixing slots 61 of the two reflectors 6, thereby realizing the
connection between the
lampshade 9 and the lamp housing. In addition, a seal ring mounted in the
fixing slot 61 is
provided between the lampshade 9 and the reflector 6 for waterproofing. A
mounting cavity
intercommunicated in front and rear sides is formed among the heat-radiating
baseplate 1, the
reflector 6, and the lampshade 9. The two end covers 10 respectively seal and
block the front
and rear ends of the mounting cavity to form the closed light source cavity 7.
The end covers
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are fixed on the heat-radiating side plate 2 and the reflector 6 by screws, so
the upper end
of the heat-radiating side plate 2 and the outer end of the reflector 6 are
provided with threaded
holes 14 extending forward and backward. The components integrally formed by
the radiator
and the lamp housing are extruded aluminum profiles or bent plates, which can
realize a
complicated mounting structure on a single piece of radiator 12, so as to
reduce the problems
of large thermal resistance and high failure risk caused by multi-part
assembly. Therefore, the
products have the advantages of better strength, lighter piece weight, and
lower cost.
In summary, according to the radiator of the present application, the extruded
aluminum
profiles are subjected to the process of punching to form the heat-radiating
fins 22 and the heat-
exchanging through grooves 21, which can greatly increase the value of the
heat exchange
coefficient h and the effective heat-radiating area, using a small amount of
material without
increasing the material cost and product weight, thereby greatly improving the
heat-radiating
capability of the radiator.
Therefore, the present invention effectively overcomes various drawbacks in
the prior art
and has high industrial utilization value.
The above-described embodiments merely exemplify the principles and functions
of the
present invention and are not intended to limit the present invention. Various
modifications or
variations of the above-described embodiments may be made by those skilled in
the art without
departing from the spirit and scope of the present invention. Therefore, all
equivalent
modifications or variations made by those of ordinary skill in the art without
departing from
the spirit and technical idea of the present invention should be covered by
the appended claims
of the present invention.
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