JP2005203560A - Radiator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat exchange efficiency without increasing manufacturing costs as much as possible. <P>SOLUTION: Flat heat receiving bodies 1-1, 2-1, 3-1 for receiving heat are laminated on at least upper, middle, and lower layers for joining, an LD array 17 for generating heat is joined onto the upper surface of the upper heat generating body 3-1 in them, a radiating fin 10 for radiating heat in the LD array 17 is formed at the junction section with the middle heat receiving body 2-1 at the lower portion of the junction surface, a channel shown by an arrow for cooling heat from the radiating fin 10 by allowing cooling water to flow is formed, and further one of the channels penetrates a communicating hole 11 in the middle heat receiving body 2-1 and is connected to a water-supplying port 5 of the lower heat receiving body 1-1, and the other is connected to a drain port 16. In this configuration, one to a plurality of weirs are provided in the channel shown by the arrow (a weir 40 and partitions 100a, 100b) to connect to the radiating fin 10 for regulation so that cooling water flowing in a channel flows while meandering in upper and lower directions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water-cooled radiator that is applied to a device that generates high heat, such as a high-power LD (laser diode) array.

As this type of prior art, for example, there is a radiator for a high-power LD array shown in FIGS. 8 is a longitudinal sectional view of the entire radiator 4, FIG. 9A is a bottom view of the upper heat receiving body 3 viewed from A1-A2 shown in FIG. 8, and FIG. 8B is B1 shown in FIG. The top view seen from -B2, (c) is the top view seen from C1-C2 shown in FIG.
Since the high-power LD array 17 has a large heat generation density of about several tens to several hundreds W / cm ² , the laser output, efficiency, transmission wavelength, and element lifetime are greatly affected by the temperature rise of the LD array 17. Therefore, how to remove the heat generated in the LD array 17 is a very important issue.

In addition, since the LD array 17 has a length of about 10 mm × width of about 1 to 1.5 mm and the contact area with the upper heat receiving member 3 is extremely small, the temperature rise cannot be suppressed by the air cooling type. In the vessel 4, a water passage is provided inside to perform water-cooled heat dissipation.
The water channel of the radiator 4 has a three-layer structure provided with an upper surface water channel shown in FIG. 9A, a middle water channel shown in FIG. 9B, and a lower water channel shown in FIG.

The operation of the radiator having such a structure will be described with reference to FIGS.
The cooling water guided to the water supply port 5 of the heat receiving body 1 passes through the circular communication hole 6 of the heat receiving body 2 and reaches the water supply port 7 of the upper heat receiving body 3. Here, the cooling water spreads by the generally fan-shaped upper surface water channel 8 and reaches a large number of the radiation fins 10. Under the present circumstances, in order to reduce the pressure loss by the side of water supply, the cross-sectional area is expanded by providing the upper countersunk part 30. FIG. The upper countersunk portion 30 is formed up to the front of the heat radiating fin 10 and plays a role of improving the flow rate and increasing the heat exchange efficiency when cooling water flows into the heat radiating fin 10.

An LD array 17 is joined to the end of the upper surface of the heat radiating fin 10. The cooling water that has reached the heat radiating fin 10 is heat-exchanged by the heat radiating fin 10, passes through the circular communication hole 11 of the intermediate heat receiving body 2, passes between the heat radiating fins 13 provided in the lower heat receiving body 1, and reaches the lower surface water channel 14. To do.
Here, the cooling water is divided into two by the flow restrictor 15, merged again at the drain port 16, and discharged outside the radiator 4. At this time, in order to reduce the pressure loss of the drain port, the flow passage cross-sectional area is enlarged by providing the through-hole 31 in the intermediate heat receiving body 2.

The heat receiving bodies 1, 2, and 3 are manufactured using a metal material having good heat conduction, and each of the heat receiving bodies 1 to 3 is joined with solder or the like in an airtight and good heat conduction state.
Examples of this type of conventional radiator include those described in Patent Document 1 and Patent Document 2, for example.
WO00 / 11922 Japanese Patent Laid-Open No. 8-139479

  By the way, in the conventional radiator, the structure of the radiation fin 10 is such that the heat generated in the LD array 17 is received by the upper heat receiving body 3 and is conducted in the thickness direction, which is several times as long as the LD array 17. It is made to guide to the designed heat radiating fin 10. Moreover, since the heat radiation amount is not sufficient only by the heat radiation fins 10 provided on the upper heat receiving body 3, heat conduction is performed to the partition wall 11a of the middle heat receiving body 2, and further heat conduction is performed to the heat radiation fins 13 provided on the lower heat receiving body 1. Thus, the heat dissipation amount is increased.

In the structure of the heat radiating fin 10, the circular shape of the water supply port 5 is enlarged to a rectangular plane, the heat generated in the LD array 17 is heat-exchanged on the front surface in the width direction, and the heat-exchanged cooling water is supplied to the circular communication hole. 11 is led to the lower channel and discharged from the drain port 16, so that the heat of the LD array 17 can be efficiently removed.
Moreover, in order to suppress the temperature rise accompanying the further increase in the output of the LD array 17, it is necessary to further improve the heat exchange efficiency with the cooling water. If production costs are ignored, it is possible to increase the heat exchange efficiency.

However, since cost reduction is actually required, it is necessary to increase the heat exchange efficiency with the current structure, but in the current structure, the relationship between the radiating fin 10 and the cooling water flowing through the radiating fin 10 is Since it is fixed, it was impossible to obtain further cooling performance.
This invention is made | formed in view of such a subject, and it aims at providing the heat radiator which can be manufactured so that improvement in heat exchange efficiency may be aimed at, without raising manufacturing cost as much as possible.

  In order to achieve the above object, a radiator according to claim 1 of the present invention includes a plate-shaped heat receiving body that receives heat and is laminated and bonded to at least three layers of upper, middle, and lower layers, and of these, the upper surface of the upper heat receiving body. A heat generating body for generating heat is joined, and a heat radiation fin for radiating heat of the heat generating body is formed at a joint portion with the intermediate heat receiving body below the joint surface, and heat from the heat radiation fin is cooled with water. In a radiator in which a flow path for cooling by cooling is formed, and the flow path passes through the middle heat receiving body and is connected to a water supply port and a drain port of the lower heat receiving body, the upper heat receiving body and the middle heat receiving body The cooling water which is joined to the heat radiation fin and flows through the flow path flows in a meandering manner in the flow path for radiating the heat conducted to the heat radiation fin formed at the joint portion with the heat receiving body. One or more weirs that are restricted to It is set to.

According to this configuration, since the cooling water meanders up and down at the joint portion between the upper heat receiving body and the middle heat receiving body, when the cooling water flows upward, the cooling water , And the turbulent flow is generated by the meandering up and down, so that the heat exchange performance can be remarkably improved.
A radiator according to claim 2 of the present invention is characterized in that, in claim 1, the area of the flow path in the portion where the water supply port and the drain port are provided is widened.
According to this configuration, since the fluid resistance is reduced by widening the area of the flow path of the water supply port and the drain port, the cooling water meanders up and down the upper heat receiving member, the middle heat receiving member, and the joint portion. Therefore, even if the fluid resistance slightly increases, the total pressure loss of the flow path does not increase so much.

  According to a third aspect of the present invention, there is provided a radiator according to the first or second aspect, wherein the weir portion is formed with comb-shaped heat radiation fins in the upper heat receiving body and is an elongated plurality of portions serving as an upper portion of the flow path. One or a plurality of weirs are provided in the groove to regulate cooling water, and a communication hole is formed in the thickness direction of the intermediate heat receiving body so that a partition wall is formed on the intermediate heat receiving body. The communication hole is provided with a concave portion that penetrates the partition wall and communicates with the lower heat receiving body so that the concave portion is closed and a flow path is formed in the intermediate heat receiving body. A thin plate-shaped heat receiving body is further joined between the heat receiving body and the lower heat receiving body.

  According to this configuration, since the partition wall of the middle heat receiving body portion is joined to the weir joined to the heat radiating fin of the upper heat receiving body, heat generated in the heating element is conducted from the upper heat receiving body to the middle heat receiving body. Becomes easy. Further, since the heat radiation area is increased by the communication holes of the intermediate heat receiving body and the communication flow path connecting the communication holes formed by closing the recesses, the cooling water flows through the communication holes and the communication flow path. As a result, the amount of heat exchange can be increased.

A radiator according to claim 4 of the present invention is characterized in that, in claim 3, at least one of a slit and a hole penetrating the upper and lower surfaces at a predetermined interval is formed in a peripheral portion of the thin plate-shaped heat receiving body. Yes.
According to this configuration, when joining a total of four layers including the thin plate-shaped heat receiving body, the brazing material sheet is omitted between the lower heat receiving body and the thin plate-shaped heat receiving body without sandwiching the brazing material sheet between the respective layers. Can do. This is because when the brazing material sheet is melted at the time of joining, the brazing material sheet interposed between the intermediate heat receiving member and the thin plate heat receiving member flows into each slit or hole by capillary action, and further, the thin plate heat receiving member and Then, it enters between the lower heat receiving body below and joins both. At this time, the intermediate heat receiving member and the thin plate heat receiving member are joined together.

  As described above, according to the radiator of the present invention, there is an effect that it can be manufactured so as to improve the heat exchange efficiency without increasing the manufacturing cost as much as possible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, parts corresponding to each other in all the drawings in this specification are denoted by the same reference numerals, and description of the overlapping parts will be omitted as appropriate.
(Embodiment)
FIG. 1 is an overall longitudinal sectional view of a radiator 4-1 according to an embodiment of the present invention.
2 shows the structure of the upper heat receiving body 3-1 of the radiator 4-1 shown in FIG. 1, (a) is a sectional view of the upper heat receiving body 3-1 similar to FIG. 1, and (b) is the upper heat receiving body 3-1. It is a bottom view of the body 3-1.
3 shows the structure of the intermediate heat receiving body 2-1 shown in FIG. 1, (a) is a plan view of the intermediate heat receiving body 2-1, and (b) shows the intermediate heat receiving body 2-1. Sectional drawing at the time of cut | disconnecting by the D1-D2 line of (a), (c) is a bottom view of the intermediate | middle heat receiving body 2-1.

4 shows the structure of the thin plate-shaped heat receiving body 104 of the radiator 4-1 shown in FIG. 1, (a) is a plan view of the thin plate-shaped heat receiving body 104, and (b) shows the thin plate-shaped heat receiving body 104 (a). It is sectional drawing at the time of cut | disconnecting by E1-E2 line | wire.
5 shows the structure of the lower heat receiving body 1-1 of the radiator 4-1 shown in FIG. 1, (a) is a plan view of the lower heat receiving body 1-1, and (b) shows the lower heat receiving body 1-1. It is sectional drawing at the time of cut | disconnecting by the F1-F2 line of (a).

  The feature of the radiator 4-1 of the present embodiment is that, as shown in FIGS. 1 and 2, first, in the upper heat receiving body 3-1, between the radiating fins 10 and as close as possible to the LD array 17. A plurality of weirs 40 that regulate the flow of the cooling water in the arranged flow path portions are provided at predetermined intervals along the flow path. Although a plurality of weirs 40 are provided here, one may be used. Further, by providing the plurality of weirs 40, the concave flow path 108 is formed between the weirs 40 and the weirs 40 and between the weir 40 and the peripheral edge of the upper heat receiving body 3-1.

Further, as shown in FIGS. 1 and 3, in the middle heat receiving body 2-1, a partition wall 100 a is formed in a portion facing the weir 40 of the upper heat receiving body 3-1 and at the center position of each concave flow channel 108. A circular communication hole 101 is provided so that the partition wall 100b is formed, and a communication channel 102 is provided that communicates with the pair of circular communication holes 101 sandwiching the partition wall 100a as a channel.
Moreover, as shown in FIG.1 and FIG.4, the thin plate-shaped heat receiving body 104 was newly provided between the middle heat receiving body 2-1 and the lower heat receiving body 1-1. The thin plate-shaped heat receiving body 104 is provided with circular communication holes 11-1 at positions corresponding to the respective circular communication holes 11 of the intermediate heat receiving body 2-1, and the spot facing of the intermediate heat receiving body 2-1 (see FIG. 3). A communication hole 105 having the same planar shape as this is provided at a position corresponding to the portion 106, and a communication hole 114 having the same planar shape as this is provided at a position corresponding to the through-hole 113 of the intermediate heat receiving body 2-1. Is formed.

Further, as shown in FIGS. 1 and 5, in the lower heat receiving body 1-1, the front end spreads in a fan shape around the water supply port 5 at a position corresponding to the communication hole 105 of the thin plate heat receiving body 104 (see FIG. 4). The lower surface water channel 107 in which the heat radiating fins 13 are formed in the portion so as to be opposed to the heat radiating fins 10 at the top and bottom, and the counterbore that spreads in a fan shape around the drain port 16 at a position corresponding to the communication hole 114 of the thin plate heat receiving body 104 A portion 115 is provided.
When the lower heat receiving body 1-1, the thin plate-shaped heat receiving body 104, the middle heat receiving body 2-1 and the upper heat receiving body 3-1 having such a structure are stacked and joined in this order, they are continuously connected to the arrows in to out in FIG. As shown, a flow path of cooling water connected from the water supply port 5 to the drain port 16 is formed.

Next, the heat radiation operation by the heat radiator having such a structure will be described.
The cooling water led to the water supply port 5 of the lower heat receiving body 1-1 is spread by the generally fan-shaped lower surface water channel 107 and reaches the heat radiation fins 13. At this time, in order to reduce the pressure loss on the water supply side, the flow passage area is enlarged by the communication hole 105 and the spot facing portion 106 of the intermediate heat receiving body 2-1 in the thin plate heat receiving body 104.
The cooling water guided to the heat radiation fins 13 of the lower heat receiving body 1-1 flows upward in the order of the communication holes 11-1 of the thin plate heat receiving body 104 and the communication holes 11 of the middle heat receiving body 2-1. As indicated by the arrows, the cooling water flows in the order of a horizontal concave channel 108, a communication hole 101 perpendicular to the concave channel 108, and a further horizontal communication channel 102. That is, it flows while meandering in the vertical direction in the region where the radiation fins 10 are formed.

  In this manner, the upper and lower meanders are repeated several times, and then guided to the upper surface water passage 109 of the upper heat receiving body 3-1. This upper surface water channel 109 has a wide portion of the upper heat receiving body 3-1 as a water channel, and after being diverted by a land 111 provided at substantially the center of the water channel, the upper heat receiving body 3-1 passes through the flow restrictor 110. 1 joins again at one drain port 112. The land 111 is not used in the present invention as follows. However, when several heat radiators 4-1 are stacked and used, a communication hole is provided in the land 111 and cooling water is supplied to each radiator. It has the function to carry to

  Next, the cooling water guided to the drain port 112 of the upper heat receiving body 3-1 passes downward through the communication hole 113 of the middle heat receiving body 2-1 and the communication hole 114 of the thin plate heat receiving body 104, and passes through the lower heat receiving body 1. -1 is drained from the drain 16 to the outside. At this time, in order to reduce the pressure loss on the drainage side, the flow passage area is determined by the spot facing portion 115 of the lower heat receiving body 1-1, the communication hole 114 of the thin plate heat receiving body 104, and the communication hole 113 of the intermediate heat receiving body 2-1. Is expanding.

  The following heat exchange is performed by the cooling water flowing in this way. The heat generated in the LD array 17 diffuses with good thermal conductivity inside the upper heat receiving body 3-1. This heat is conducted to the tip of the weir 40 and the radiation fin 10 provided in the very vicinity of the LD array 17 mounting portion. The heat conducted to the tip is conducted to the partition wall 100 and the peripheral edge 116 of the intermediate heat receiving body 2-1. Thus, the heat received by the intermediate heat receiving body 2-1 diffuses in the thickness direction of the intermediate heat receiving body 2-1, passes through the thin plate-shaped heat receiving body 104, and the peripheral edge portion 117 of the lower heat receiving body 1-1. And conducted to the radiation fins 13.

  Thus, since the thin heat radiation fin 10 and the weir 40 of the upper heat receiving body 3-1 are directly joined to the thin partition wall 100 of the middle heat receiving body 2-1, the lower heat receiving body 1-1 to the middle heat receiving body 2-1. The heat conduction is significantly improved. Here, since the heat radiation area is increased by forming the plurality of communication holes 101 and the communication channels 102 in the intermediate heat receiving body 2-1, the cooling water passes through these communication holes 101 and the communication channels 102. By flowing, the amount of heat exchange increases.

Further, since the cooling water hits the right bottom surface of the LD array 17 as a heat source in the vertical direction, and turbulent flow is caused by the upper and lower meanders, the heat exchange performance is remarkably improved.
Moreover, in such a heat radiator 4-1, each heat receiving body 1-1,104,2-1,3-1 increases by one layer from 3 layers to 4 layers compared with a prior art. Therefore, when the joining method of the prior art is used, the lower heat receiving body 1-1, the brazing material sheet, the thin plate heat receiving body 104, the brazing material sheet, the middle heat receiving body 2-1, the brazing material sheet, and the upper heat receiving body 3 in order from the bottom. For example, three raw material sheets are required.

However, as shown in FIGS. 6 (a) and 6 (b), a plurality of slits 118 that penetrates the upper and lower surfaces at predetermined intervals along the peripheral edge are formed in the rectangular peripheral edge of the intermediate heat receiving body 2-1. 7, two brazing material sheets 119 are disposed between the upper heat receiving body 3-1 and the intermediate heat receiving body 2-1, and between the intermediate heat receiving body 2-1 and the thin plate heat receiving body 104. Thus, four layers were joined.
When joining in this way, the lower heat receiving body 1, the thin plate-shaped heat receiving body 104, the brazing material sheet 119, the middle heat receiving body 2-1, the brazing material sheet 119, and the upper heat receiving body 3 are laminated in this order and set on a jig. Join. At the time of melting of each brazing material sheet 119, the lower brazing material sheet 119 flows into each slit 118 as shown by an arrow in FIG. 7 due to a capillary phenomenon, and further, between the thin plate-shaped heat receiving body 104 and the lower heat receiving body 1 Go in between and join both. At this time, the thin plate-shaped heat receiving body 104 and the intermediate heat receiving body 2-1 are also joined at the same time.

That is, by forming the slit 118 in the thin plate-shaped heat receiving body 104 in this manner, it is possible to join four layers with the two brazing material sheets 119, and thus two brazing material sheets 119 as in the conventional three layers. Just do it. A through hole may be formed instead of the slit 118.
As described above, according to the radiator 4-1 of the present embodiment, it is easy to conduct heat generated in the LD array 17 from the upper heat receiving body 3-1 to the middle heat receiving body 2-1, and The amount of heat exchange can be increased by increasing the heat radiation area by the communication hole 101 and the communication channel 102 of the intermediate heat receiving body 2-1 and flowing cooling water through the communication hole 101 and the communication channel 102.

In addition, since the cooling water meanders up and down inside the intermediate heat receiving body 2-1, when the cooling water flows upward, the cooling water hits the direct lower surface of the LD array 17 and Since the turbulent flow is generated by the upper and lower meanders, the heat exchange performance can be remarkably improved.
In addition, the fluid resistance when flowing through the communication hole 101 and the communication channel 102 of the intermediate heat receiving body 2-1 slightly increases, but the fluid resistance is reduced by increasing the channel area on the water supply port 5 side and the drain port 16 side. Therefore, the total pressure loss does not increase so much. Furthermore, since the weir 40 and the concave channel 108 can be easily formed by etching, plastic working, etc., the manufacturing cost is hardly changed.

Moreover, although it will increase by 1 layer from 3 layers to 4 layers compared with a prior art, by providing the slit 118 in the thin plate-shaped heat receiving body 104, the same number of brazing material sheets 119 as the time of 3 layers joining of a prior art is provided. The cost increase can be suppressed because it is sufficient. Further, since the thin plate-shaped heat receiving body 104 can be easily formed by a press or the like, the cost is not greatly increased.
Therefore, the radiator 4-1 can be manufactured so as to improve the heat exchange efficiency without increasing the manufacturing cost as much as possible.

It is the longitudinal cross-sectional view of the whole heat radiator which concerns on embodiment of this invention. The structure of the upper heat receiving body of the heat radiator which concerns on the said embodiment is shown, (a) is sectional drawing of an upper heat receiving body, (b) is a bottom view of an upper heat receiving body. The structure of the intermediate | middle heat receiving body of the heat radiator which concerns on the said embodiment is shown, (a) is a top view of an intermediate | middle heat receiving body, (b) is a cross section at the time of cut | disconnecting an intermediate | middle heat receiving body by the D1-D2 line of (a). FIG. 4C is a bottom view of the intermediate heat receiving body. The structure of the thin plate-shaped heat receiving body of the radiator according to the above embodiment is shown, (a) is a plan view of the thin plate-shaped heat receiving body, and (b) is the thin plate-shaped heat receiving body cut along line E1-E2 of (a). FIG. The structure of the lower heat receiving body of the heat radiator which concerns on the said embodiment is shown, (a) is a top view of a lower heat receiving body, (b) is a cross section when the lower heat receiving body is cut | disconnected by F1-F2 line of (a) FIG. FIG. 4 shows a structure in which slits are provided in the thin plate-shaped heat receiving body of FIG. 4, (a) is a plan view of the thin plate-shaped heat receiving body, and (b) is a view when the thin plate-shaped heat receiving body is cut along the G1-G2 line of (a). It is sectional drawing. It is a figure which shows the arrangement | positioning state of the brazing material sheet | seat for joining the lower heat receiving body of the heat radiator which concerns on embodiment, the thin plate-shaped heat receiving body provided with the slit shown in FIG. 6, a middle heat receiving body, and an upper heat receiving body. It is the longitudinal cross-sectional view of the whole conventional radiator. The structure of the conventional heat radiator is shown, (a) is a bottom view of the upper heat receiving body seen from A1-A2 shown in FIG. 8, (b) is a plan view seen from B1-B2 shown in FIG. FIG. 10 is a plan view seen from C1-C2 shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1-1 Lower heat receiving body 2,2-1 Middle heat receiving body 3,3-1 Upper heat receiving body 4,4-1 Radiator 5 Water supply port 6 Circular communication hole 8 Upper surface water channel 10,13 Radiation fin 11,101 Circular Communication hole 11a, 100a, 100b Bulkhead 14 Lower surface water channel 15 Channel constriction part 16 Drainage port 17 LD array 30 Upper counterbore part 31 Through hole 40 Weir 104 Thin plate heat receiving body 105 Communication hole 106, 115 Spot face part 108 Concave flow path 113 Through-hole 114 Communication hole 107 Lower surface water channel 109 Upper surface water channel 110 Channel constriction part 111 Land 112 Drain port 113,114 Communication hole 117 Peripheral part of lower heat receiving body 118 Slit 119 Raw material sheet

Claims (4)

A plate-shaped heat receiving body that receives heat is laminated and bonded to at least three layers, upper, middle, and lower layers, and a heating element that generates heat is bonded to the upper surface of the upper heat receiving body, and the intermediate heat receiving body below the bonding surface. A heat dissipation fin for radiating the heat of the heating element is formed at a joint portion with the heat sink, and a flow path for cooling the heat from the heat dissipation fin by flowing cooling water is formed. In the radiator that penetrates the heat receiving body and is connected to the water supply port and the drain port of the lower heat receiving body,
The cooling water that is joined to the heat radiation fin and flows through the flow path is vertically connected to the flow path for radiating the heat conducted to the heat radiation fin formed at the joint portion between the upper heat receiving body and the middle heat receiving body. A radiator having one or more weir portions that are controlled to flow while meandering in a direction. The radiator according to claim 1, wherein an area of a flow path in a portion where the water supply port and the drain port are provided is widened. The weir is
Forming one or more weirs so as to regulate cooling water in a plurality of elongated grooves which form upper teeth of the flow path and form comb-like heat radiation fins in the upper heat receiving body;
A communication hole is formed in the thickness direction of the intermediate heat receiving body so that a partition wall to be joined to the weir is formed in the intermediate heat receiving body, and a concave portion that communicates with the communication hole through the partition wall is formed on the lower side. Provided on the surface facing the heat receiver,
A thin plate-shaped heat receiving body is further joined between the intermediate heat receiving body and the lower heat receiving body so that the recess is closed and a flow path is formed in the intermediate heat receiving body. The heat radiator according to claim 1 or 2. 4. The radiator according to claim 3, wherein at least one of a slit and a hole penetrating the upper and lower surfaces at a predetermined interval is formed in a peripheral portion of the thin plate-shaped heat receiving body.

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