JPH0685481A - Cooling structure for electronic equipment - Google Patents

Abstract

PURPOSE:To provide a cooling structure which uniformly cools printed boards housed in each shelf, where the shelves where printed boards are housed in parallel respectively are stacked up in layers in a rack in a forced-air cooling type electronic equipment. CONSTITUTION:An air intake-exhaust unit 5, a lower shelf 10-2, an upper shelf 10-1, and a fan unit 2 are successively stacked up in layers in a rack 1 from below toward a top in an air-forced cooling type electronic equipment, where printed boards 15 mounted in parallel in each shelf are air-forced cooled. Components of high heat release value are mounted on the front side of the printed board 15 mounted in the lower shelf 10-2, and air intake vents 20 are provided to the a front plate 18 or a separate front plate which blocks the opening of the lower shelf 10-2 corresponding to the component of high heat release value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced air cooling type electronic device cooling structure in which shelves accommodating printed boards in parallel are stacked on a rack.

[0002]

4 is a perspective view of a conventional electronic apparatus, FIG. 5 is a perspective view of essential parts of a shelf, FIG. 6 is a sectional view of a conventional example, and FIG. 7 is a perspective view of essential parts of another conventional shelf. .

In FIGS. 4 to 6, reference numeral 10-1 is a box-shaped upper shelf having an open front surface, which is composed of a lower plate, left and right side plates, and a backboard 13 on which a backboard connector 13A is arranged. Yes, 10-2 is a lower shelf having the same structure as the upper shelf 10-1.

Each of the shelves is provided with guide rails, which are arranged inside the lower plate and the upper plate, by squeezing. Insert the upper and lower side edges of the printed board 15 by selecting a pair of upper and lower guide rails,
A large number of printed boards 15 are accommodated in parallel in the respective shelves by plugging the printed board connectors 15A into the backboard connectors 13A facing each other.

Since the guide rails are squeezed out in this way, ventilation slits are formed in the upper and lower side plates, respectively. Further, after inserting and mounting all the printed boards 15 in the shelf, the front board 18 is attached to the opening side of the shelf to close the opening of the shelf.

Reference numeral 2 is a fan unit installed above the shelf to be cooled. The fan unit 2 is
A plurality of fans are two-dimensionally arranged in a rectangular frame having a shape that is the same as the plan view of the shelf, and the air in the lower shelf is sucked and discharged upward by the rotation of the fans.

Reference numeral 5 is a frame-shaped air intake / exhaust unit having four side surfaces surrounded by side plates and having the same shape as the plan view of the shelf. The air intake / exhaust unit 5 is provided with a shielding plate 6 inside the frame so as to be positioned on the diagonal line of the front downward in a side view, and divides the frame body into two spaces obliquely above and below.

Further, a window 7A for sucking cool air is provided on the front side plate of the air intake / exhaust unit 5, and a window 7B for discharging warm air is provided on the rear side plate. The electronic device includes, on a pedestal 1 installed on the floor, from the bottom to the top, an air intake / exhaust air unit 5, a lower shelf 10-2, an upper shelf 10-1, a fan unit 2, and other air intake / exhaust units 5, 5. The lower shelf 10-2, the upper shelf 10-1, and another fan unit 2 are stacked in this order.

Therefore, as shown in FIG. 6, by driving the fan unit 2 installed in the middle stage, the gantry 1
The window provided in the front of the air intake / exhaust unit 5 installed at the bottom of the
Cool air is sucked in from 7A, and the cool air passes through the ventilation slits in the lower plate of shelf 10 of lower shelf 10-2, and then lower shelf 10
-2 inside, takes up heat from the printed board 15 and the mounted parts, rises, and enters the upper shelf 10-1 through the ventilation slit of the upper board.

Then, the printed board 15 of the upper shelf 10-1
And, after cooling the mounted components, it goes up via the fan unit 2 and enters the air intake / exhaust air unit 5 installed in the middle stage, rises diagonally rearward along the shielding plate 6 of the air intake / exhaust air unit 5 in the middle stage, and the rear window 7B. And is discharged to the rear of the rack 1.

On the other hand, the fan unit 2 installed at the uppermost stage
By driving, the cool air is sucked in from the window 7A of the front side plate of the middle-stage air intake / exhaust unit 5, and the cool air travels obliquely upward along the shield plate 6 and enters the lower shelf 10-2 and its printed board 15 and The heat of the mounted components is taken away and rises, and enters the upper shelf 10-1 through the ventilation slit of the upper plate.

The printed board 15 of the upper shelf 10-1
After cooling etc., through the top fan unit 2,
It is discharged above the rack 1. In addition, an electronic device in which an individual front plate is attached to each printed board and the individual front surfaces are arranged in parallel to close the opening of the shelf is also used.

In the shelf shown in FIG. 7, the printed boards on which the box-shaped covers are mounted are accommodated side by side, and individual front boards are attached to the front side edges of the respective printed boards so as to be orthogonal to the printed boards. ing.

In FIG. 7, reference numerals 30-1 and 30-2 denote upper and lower main plate members 31, rear plate members, and ventilation holes 38 arranged in parallel in order to protect mounted components mounted on the respective printed boards 15.
A box-shaped cover composed of the lower plate member 32, in which the edge frame on the opening side is brought into contact with the mounting surface of the printed board 15 by screw means or the like,
It is attached to the printed board 15.

The box-shaped covers 30-1 and 30-2 have the same mounting height but have the same size and shape. The mounting height of the box-shaped cover is larger than the mounting height of the mounting components mounted on the printed board.

Therefore, as the mounting heights of the mounting components differ, the mounting heights of the respective box-shaped covers also differ. In the figure, the mounting height of the box cover 30-1 is the box cover 30-2.
It is as large as about 1.5 times the mounting height.

Further, the individual front plate 40-1 is attached to the printed board 15 having the box-shaped cover 30-1 having a high mounting height, and the other printed board 15 having the other box-shaped cover 30-2 is provided with the other. An individual front plate 40-2 is attached.

In addition, each of the individual front plates 40-1, 40-2
Is a box-shaped cover 30- mounted on each printed board 15.
It is also configured as a 1,30-2 front plate. On the other hand, the pitch of the guide rails of the shelf into which the printed board is inserted is equal.

Further, since the pitch of the guide rails of the shelf into which the printed board is inserted is the same pitch, it is assumed that the mounting height of the box-shaped cover 30-2 whose mounting height is low at present is smaller than the distance between the two pitches of the guide rails. The mounting height of the box-shaped cover 30-1 having a high mounting height is slightly larger than the distance between the two pitches of the guide rails.

Therefore, the box-shaped cover 30-2 has a low mounting height.
Although the distance between the main surface plate member 31 and the adjacent printed board is small, the distance between the main surface plate member 31 and the adjacent printed board of the box-shaped cover 30-1 having a high mounting height is large.

As a result, the box-shaped cover has a high mounting height.
A large gap is generated between the individual front plate 40-1 of the printed board 15 on which the 30-1 is mounted and another adjacent individual front plate. Therefore, by inserting the blank front plate 40B into this gap, the individual front plates 40-
1, 40-2, Blank Front plate 40B is closed.

The shelf having the above-described structure is constructed by stacking an intake / exhaust air unit, a lower shelf, an upper shelf, a fan unit, and another intake / exhaust air unit, a lower shelf, an upper shelf, and another fan unit on a rack in this order. Since the electronic device also has ventilation holes in the upper and lower side plate members of the box-shaped cover, it is possible to cool the printed board and the mounted components mounted on the printed board almost in the same manner as described above.

[0023]

By the way, in the former, that is, in an electronic device in which shelves for accommodating printed boards not having a box-shaped cover are stacked, the upper shelf is directly below the fan unit, and therefore suction of parallel fans is performed. The force acts regardless of the front-back direction of each printed board, and flows between the arrayed printed boards in a straight upward direction at almost the same high wind speed.

Therefore, the printed board housed in the upper shelf is cooled substantially uniformly. However, in the lower shelf, since the air sucked from the front window of the air intake / exhaust unit changes its direction by the shield plate and rises diagonally, there is unevenness in the rising flow velocity and flow rate. By this,
There was a problem that the cooling effect of the mounted components mounted on the lower shelf was low.

If the air intake / exhaust air units are installed under the respective shelves and the air intake / exhaust air units are installed on the shelves, respectively, the above problem can be solved. Is expensive, which is not preferable.

On the other hand, in the latter case, that is, in an electronic device in which shelves accommodating printed boards with box-shaped covers are stacked, the printed boards with box-shaped covers having a high mounting height have adjacent printed boards and box-shaped covers. There is a relatively large space between. Due to this, a larger amount of cooling air flows in this space, and the amount of air rising in the box cover decreases.

Therefore, there is a problem in that the mounted parts, especially the high heat generating parts, housed in such a box-shaped cover are not cooled to a desired temperature. The present invention has been made in view of the above circumstances, and an object thereof is to provide a cooling structure for an electronic device, which is capable of substantially uniformly cooling mounted components of a printed board housed in a lower shelf.

Another object of the present invention is to provide an electronic apparatus which can be applied to a shelf accommodating a printed board on which a box-shaped cover is mounted to cool the mounted components mounted on the printed board almost uniformly.

[0029]

In order to achieve the above-mentioned object, the present invention, as illustrated in FIG. 1, shows an intake / exhaust air unit, a lower shelf, an upper shelf, a fan unit on a rack from the lower side to the upper side. In order to forcibly air cool the printed boards mounted in parallel on each shelf, the printed boards 15 mounted on the lower shelf 10-2 are equipped with high heat-generating components near the front side. ,
A suction port 20 is provided on the front plate 18 or an individual front plate that closes the opening of the lower shelf 10-2 corresponding to each high heat generating component.

Further, as illustrated in FIG. 2, a printed board with individual front boards is formed by stacking the intake / exhaust air unit, the shelf, and the fan unit in this order from the bottom to the top on the rack, and mounting them in parallel on each shelf. In an electronic device configured to perform forced air cooling, in order to cover and protect all mounted components, a box-shaped cover including a main plate member 31, a rear plate member, and an upper / lower plate member 32 in which ventilation holes 38 are arranged in parallel is provided. It shall be mounted on the mounting surface of the printed board 15 of.

The individual front plates 40-1 and 40-2 are configured to also serve as the front side plates of the box-shaped covers 30-1 and 30-2 mounted on the printed boards 15, respectively. 30-1
The high heat generating component 35 is mounted near the front side of the selected printed board 15 in which the distance between the main surface plate member 31 and the adjacent printed boards is sufficiently large.

The individual front plate 40 of the selected printed board 15
-1 is provided with a suction port 45 facing the high heat generating component 35.

[0033]

According to the first aspect of the present invention, in the printed board mounted on the lower shelf, the high heat generating component is mounted near the front side of the printed board, and the front plate or the individual front plate is provided with the suction port. .

Therefore, the air on the front side of the rack is sucked into the shelf through the suction port, and cools the high heat generating component. Therefore, the printed board housed in the lower shelf is also cooled almost as much as the printed board housed in the upper shelf.

According to the second aspect of the present invention, the high heat generating component is mounted in the vicinity of the front side of the printed board, and the individual front plate is provided with the suction port at a position facing the high heat generating component. Therefore, the air on the front side of the rack is sucked into the box-shaped cover through these suction ports, and cools the high heat-generating component. Therefore, the mounting components mounted on the printed board are cooled almost equally without being affected by the mounting height of the box-shaped cover.

[0036]

The present invention will be described in detail with reference to the drawings. The same reference numerals denote the same objects throughout the drawings.

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a perspective view of a main part of another embodiment of the present invention, and FIG. 3 is a front view of another embodiment of the present invention. As shown in FIG. 1, the lower shelf 10-2 has a box shape with an open front surface and is composed of a lower plate, left and right side plates, and a backboard on which a backboard connector is arranged. -1 also has the same structure as the lower shelf 10-2.

These shelves are provided by arranging guide rails on the inside of each of the lower plate and the upper plate by squeezing, etc., and the upper and lower side edges of the printed board 15 are
By selecting and inserting a pair of upper and lower guide rails and plugging the printed board connectors into the opposing backboard connectors, a large number of printed boards 15 can be accommodated in parallel.

After inserting and mounting all the printed boards 15 into the shelf, the upper shelf 10-1 and the lower shelf 10
-A front plate 18 is attached to each opening side of -2 to close the openings.

The fan unit 2 is formed by arranging a plurality of fans in a plane in a rectangular frame having the same shape as the plan view of the shelf, and sucks air in the lower shelf and discharges the air upward by rotation of the fans.

The air intake / exhaust unit 5 has a frame shape in which four side surfaces are surrounded by rectangular side plates and has the same shape as the plan view of the shelf.
A shielding plate is provided in the frame so as to be located on the diagonal line of the front downward in a side view, and divides the frame body into two spaces, diagonally above and diagonally below.

Further, a window for sucking cool air is provided on the front side plate of the air intake / exhaust unit 5 and a window for discharging warm air is provided on the rear side plate. The electronic devices are installed on the floor mounted on the floor 1 from the bottom to the top of the air intake / exhaust unit 5, the lower shelf 10
-2, upper shelf 10-1, fan unit 2, and other air intake and exhaust unit 5, lower shelf 10-2, upper shelf 10
-1 and another fan unit 2 are laminated in this order.

A printed board 15 mounted on the lower shelf 10-2
Has a high heat generating component mounted near the front side. The front plate 18 attached to the lower shelf 10-2 is provided with slit-shaped suction ports 20 corresponding to the high heat-generating components.

In an electronic device having a structure in which the individual front plates are attached to the printed board and the individual front plates are arranged to close the opening on the front surface of the shelf, it goes without saying that the individual front plate is provided with the suction port. .

When the fan unit 2 of the electronic device constructed as described above is driven, cool air is sucked in through the window provided in the front part of the air intake / exhaust unit 5 mounted below the lower shelf 10-2, and the cool air is cooled by the lower shelf. After passing through the ventilation slits in the lower plate of the shelf 10 of 10-2, the inside of the lower shelf 10-2 is taken, the heat of the printed board 15 and the mounted components is taken up, and the upper shelf 10-1 is passed through the ventilation slits in the upper plate. to go into.

Then, the printed board 15 of the upper shelf 10-1
And, after cooling the mounted components, it rises via the fan unit 2, enters the upper air intake / exhaust air unit 5, rises diagonally rearward along the shielding plate of the middle air intake / exhaust air unit 5, and passes through the window in the rear part to the rack 1 Is discharged to the rear of.

At this time, high heat-generating components are mounted on the printed board 15 housed in the lower shelf 10-2 near the front surface, and the front plate 18 is further provided with the suction port 20. Therefore, when the fan unit is driven, the cool air on the front surface side of the front plate 18 is sucked into the shelf through the suction port 20, and the cool air robs the heat of the high heat generating component.

Therefore, not only the printed board and the mounted parts housed in the upper shelf but also the printed board and the mounted parts housed in the lower shelf are cooled substantially uniformly.
The shelves shown in FIGS. 2 and 3 accommodate printed boards having box-shaped covers arranged side by side, and individual front boards are provided at the front side edges of the respective printed boards so as to be orthogonal to the printed boards. It is attached.

More specifically, each printed board 15 has a box-shaped cover 30-1 for protecting mounted components mounted thereon.
Alternatively, the box-shaped cover 30-2 is installed. These box-shaped covers 30-1 and 30-2 differ only in their mounting heights, but are the same in other dimensions and shapes. The main surface plate member 31, the rear side plate member, and the upper and lower side plates in which the ventilation holes 38 are arranged side by side. By the member 32, the edge frame on the opening side is brought into contact with the mounting surface of the printed board 15 by screw means or the like,
It is attached to the printed board 15.

Since the mounting height of the box-shaped cover is larger than the mounting height of the mounting components mounted on the printed board, the mounting heights of the box-shaped covers differ as the mounting heights of the mounting components differ. . In the figure, the mounting height of the box cover 30-1 is about 1.5 times larger than the mounting height of the box cover 30-2.

Further, the individual front plate 40-1 is attached to the printed board 15 on which the box-shaped cover 30-1 having a high mounting height is mounted, and another printed board 15 on which the other box-shaped cover 30-2 is mounted is provided with another An individual front plate 40-2 is attached.

Also, each individual front plate 40-1, 40-2
Is a box-shaped cover 30- mounted on each printed board 15.
It is also configured as a 1,30-2 front plate. Further, since the pitch of the guide rails 19 of the shelf into which the printed board is inserted is an equal pitch, if the mounting height of the box-shaped cover 30-2, which has a currently low mounting height, is smaller than the distance between the two pitches of the guide rails, mounting The mounting height of the tall box-shaped cover 30-1 is slightly larger than the distance between the two pitches of the guide rails.

Therefore, the box-shaped cover 30-2 has a low mounting height.
Although the distance between the main surface plate member 31 and the adjacent printed board is small, the distance between the main surface plate member 31 and the adjacent printed board of the box-shaped cover 30-1 having a high mounting height is large.

Due to this, a box-shaped cover with a high mounting height
A large gap is generated between the individual front plate 40-1 of the printed board 15 on which the 30-1 is mounted and another adjacent individual front plate. Therefore, by inserting the blank front plate 40B into this gap, the individual front plates 40-1, 40-
2, Blocked with blank front plate 40B.

In the shelf having the above-described structure, the present invention provides the selected printed board 15 with a sufficiently large distance between the main surface plate member 31 of the box-shaped cover 30-1 and the adjacent printed boards. Mount the component 35 near the front side.

The individual front plate 40-1 mounted on the selected printed board 15 is provided with a suction port 45 at a position facing the high heat generating component 35. The shelf configured as described above is not shown in the drawing, but is shown on the rack from the bottom to the top,
The air intake / exhaust unit, the lower shelf, the upper shelf, and the fan unit are stacked in this order.

Therefore, when the fan unit is driven, cool air is sucked in from the window provided in the front part of the air intake / exhaust unit mounted below the lower shelf, and the cool air passes through the ventilation slit of the lower side shelf of the lower shelf, Enter the lower shelf, enter the respective box-shaped covers from the ventilation holes 38 of the lower plate members 32 of the box-shaped covers 30-1 and 30-2, cool the mounted components, and move up to raise the upper plate member 32. Exit from the ventilation hole 38,
After entering the upper shelf, the components mounted on the printed board 15 housed in the upper shelf are cooled in the same manner.

At this time, since the distance between the main surface plate member 31 of the box-shaped cover 30-1 having a high mounting height and the adjacent printed board is large, the air resistance is small. Therefore, a larger amount of air rises in this space, and the amount of air flowing into the box-shaped cover 30-1 is relatively small.

However, since the high heat generating component is mounted at a position closer to the front side and the individual front plate 40-1 is provided with the suction port 45, the cold air on the front side of the individual front plate 40-1 is protected by the box-shaped cover 30. -1
It is sucked into the inside and the cold air takes away the heat of the high heat-generating components.

Therefore, the high heat generating component is maintained at a predetermined low temperature.

[0061]

As described above, according to the present invention, in the rack, from the lower side to the upper side, the intake / exhaust air unit, the lower shelf,
In an electronic device that stacks the upper shelf and fan unit in this order, the printed board that is housed in the lower shelf has high heat-generating components near the front, and a suction port is provided on the front board (or individual front board). As a result, the printed board housed in the lower shelf can be cooled to almost the same temperature as the printed board housed in the upper shelf.

Further, a box-shaped cover is mounted on the printed board,
In a shelf with a structure that protects mounted components, high-heat-generating components are mounted near the front of the printed board, and suction holes are provided on each individual front panel, so the mounting height of the box-shaped cover is not affected. The effect is that the mounted components mounted on the printed board are cooled substantially uniformly.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of another embodiment of the present invention.

FIG. 3 is a front view of another embodiment of the present invention.

FIG. 4 is a perspective view of a conventional electronic device.

[Fig. 5] Perspective view of essential parts of shelf

FIG. 6 is a sectional view of a conventional example.

FIG. 7 is a perspective view of a main part of another conventional shelf.

[Explanation of symbols]

 1 rack 2 fan unit 5 air intake / exhaust unit 10-1 upper shelf 10-2 lower shelf 15 printed board 18 front board 20 inlet 30-1, 30-2 box cover 31 main surface plate member 32 upper and lower side plate members 38 ventilation holes 40 -1,40-2 Individual front plate 40B Blank front plate 35 High heat generating parts 45 Intake port

Claims (2)

[Claims] 1. An electronic device in which an air intake / exhaust unit, a lower shelf, an upper shelf, and a fan unit are stacked in this order from the bottom to the top of a rack, and printed boards mounted in parallel on the respective shelves are forcibly cooled by air. In the above, in the printed board (15) mounted on the lower shelf (10-2), high heat generating components are mounted near the front side, and the lower shelf (1
(0-2) on the front plate (18) or individual front plate that closes the opening,
A cooling structure for an electronic device, which is provided with (20). 2. An electronic device comprising a stack of an air intake / exhaust unit, a shelf, and a fan unit, which are stacked in this order from the bottom to the top of a rack, and a printed board with an individual front plate mounted in parallel on each shelf for forced air cooling. In order to cover and protect all mounted components in equipment, a box-shaped cover consisting of a main plate member, a rear plate member, and upper and lower plate members in which ventilation holes (38) are arranged in parallel is mounted on each printed board (15). Each of the individual front plates (40-1, 40-2) mounted on the surface is also used as the front plate of the box-shaped cover (30-1, 30-2) mounted on each of the printed boards (15). The selected printed board that is configured and has a sufficiently large gap between the main board member (31) of the box-shaped cover (30-1) and the adjacent printed board.
(15), the high heat-generating component (35) is mounted near the front side, the individual front plate (40-1) of the selected printed board (15), facing the high heat-generating component (35), A cooling structure for an electronic device, comprising a suction port (45).