JPH08236974A - Cooling structure of electronic device - Google Patents

Abstract

PURPOSE: To provide a cooling structure wherein air conditioning air does not lower cooling property of an electronic device when an electronic device is installed inside a building wherein air conditioning air flows. CONSTITUTION: In an electronic device of a structure wherein outlet hot air which the cooled an electronic part contained inside a frame is exhausted from an exhaust hole provided to a ceiling board 7 of a frame 2, a control board 10 whose windward side of air conditioning air P tilts downward and the lee side is opened is attached to an upper edge part of the frame 2 which is on the windward side of air conditioning air P blown from an air conditioner to cover above the ceiling board 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for electronic equipment. In recent years, electronic components have been mounted on a printed wiring board or the like with high density, and the printed wiring boards are accommodated in parallel on a shelf to form an electronic unit. Electronic equipment in which the electronic unit is mounted in multiple stages on a rack has been widely used. There is.

In such an electronic device, the electronic parts mounted on the printed wiring board are cooled by natural air cooling or forced air cooling.

[0003]

2. Description of the Related Art FIG. 5 shows an example of the above electronic device. In the figure, 3 is an electronic unit in which a large number of printed wiring boards are mounted in parallel on a box-shaped shelf.

More specifically, the shelf has a box shape with an open front surface composed of upper and lower side plates, left and right side plates, and a backboard provided with a backboard connector. Inside the lower and upper plates of the shelf, guide rails are installed in parallel by squeezing, etc., and the upper and lower side edges of the printed wiring board are inserted into the guide rails, and the backboard connector facing the printed board connector. The printed wiring board is attached in parallel to the shelf to form the electronic unit 3.

The electronic unit 3 is mounted on the rack 2 with the opening side being the front surface F. It should be noted that ventilation slits are arrayed on the upper and lower plates of the shelf by squeezing the guide rails described above.

Reference numeral 4 denotes a frame-shaped air intake / exhaust unit whose four side surfaces are surrounded by side plates and which is substantially the same as the shape of the electronic unit 3 in plan view, and is mounted on the frame 2 below the electronic unit 3. The air intake / exhaust unit 4 is provided with a partition plate 4A in the frame so as to be positioned on the diagonal line of the front downward direction in a side view, thereby partitioning the frame body into two spaces, obliquely above and diagonally below.

Further, a window for sucking cool air is provided on the front side plate of the air intake / exhaust unit 4, and a window for discharging warm air is provided on the rear side plate. On the rack 2 installed on the floor, from bottom to top,
The electronic device 1 is configured by stacking the intake and exhaust unit 4, the electronic unit 3, the intake and exhaust unit 4, and the electronic unit 3 in this order.

A large number of exhaust holes are arranged in the ceiling plate 7 of the rack 2. The electronic device 1 has a rear space 6 between the electronic unit 3, the air intake / exhaust unit 4 and the rear plate of the rack 2 for raising the warm air K discharged from the air intake / exhaust unit 4 through the rear window.

Therefore, the warm air K that has sucked in cool air from the window provided in the front part of the air intake / exhaust air unit 4 and the front surface F of the electronic unit 3 and cooled the electronic parts of the electronic unit 3 rises in the rear space 6 and rises to the ceiling. It is discharged above the rack 2 from the exhaust hole of the plate 7.

In the case of forced air cooling, the electronic unit 3
The fan unit is mounted between the upper and lower intake / exhaust air units 4, and the front opening of the electronic unit is closed by the front plate.

[0011]

In a building such as a station building in which electronic equipment is installed as described above, it is common to install an air conditioner in a room or the like to suppress a temperature rise of the electronic equipment.

By installing the air conditioner in this way,
As shown in FIG. 6, when the electronic device 1 is installed close to the wall 70 side, the conditioned air P blown by the air conditioner passes above the electronic device 1 and is reflected by the wall 70. Then, a part of the reflected air conditioning air Pr may flow toward the ceiling plate 7 of the electronic device 1 and flow into the upper part of the electronic device 1.

In such a case, the warm air K rising from the exhaust hole of the ceiling plate 7 of the electronic device 1 is prevented from being discharged, and the cooling performance of the electronic device 1 is deteriorated.

Further, when the low-height electronic device 1 and the high-height electronic device 60 are installed side by side, as shown in FIG.
The air-conditioning air P blown by the air conditioner 80 passes above the electronic device 1 and hits and is reflected by the upper side surface of the adjacent high-height electronic device 60. Then, a part of the reflected air conditioning air Pr may flow toward the ceiling plate 7 of the electronic device 1 and flow into the upper part of the electronic device 1.

In such a case, there is a problem that the cooling performance of the electronic device 1 is lowered. The present invention has been made in view of the above point, and when the electronic device is installed in a building in which air-conditioning air flows, the cooling of the electronic device does not reduce the cooling performance of the electronic device by the air-conditioning air. It is intended to provide a structure.

[0016]

In order to achieve the above-mentioned object, the present invention, as illustrated in FIG. 1, applies the warm air K obtained by cooling the electronic components housed in the rack 2 to the ceiling plate 7 of the rack 2. In an electronic device having a structure in which the air is exhausted from an exhaust hole provided in the air conditioner, the windward side of the air conditioning wind P is inclined downward to the front and the leeward side is opened at the upper edge of the rack that is the windward side of the air conditioning wind P blown by the air conditioner The control plate 10 is attached so as to cover the ceiling plate 7 from above.

As illustrated in FIG. 2, the mounting angle of the control plate 20 is variable. Further, the control plate 20 is provided with a curved portion 21 which is warped toward the conditioned air P side above the control plate 20. As illustrated in FIG. 4, in the electronic device 1 for discharging the warm air K obtained by cooling the electronic components housed in the rack 2 from the exhaust hole provided in the ceiling plate 7 of the rack 2, the high-height electronic device 60 adjacently installed. Frame 30 on top of rack 2 so that it is almost equal to the height of
Is fitted.

[0018]

According to the present invention, a control plate is installed at the edge of the upper part of the rack which is on the windward side of the air conditioning wind so that the windward side of the air conditioning wind is inclined downward to the front so as to cover above the ceiling plate. Since the wind flows diagonally upward along the control plate, it does not hit the upper part of the side surface of the high-height electronic device installed adjacent to the electronic device.

That is, since there is no air-conditioning wind reflection, there is no obstacle to the discharge of warm air of natural air cooling or forced air cooling rising from the exhaust hole of the ceiling plate of the electronic equipment. Even if the electronic device is installed close to the wall, the conditioned air blown by the air conditioner hits the upper part of the wall, so that the reflected conditioned air reflected by the wall does not flow toward the ceiling plate of the electronic device. Therefore, it does not hinder the discharge of warm air of natural air cooling or forced air cooling rising from the exhaust hole of the ceiling plate of the electronic device.

When the conditioned air is strong, the static pressure in the vicinity of the upper side edge of the control plate becomes a negative pressure, so that the discharge of warm air is urged. By changing the mounting angle of the control plate, the tilt angle of the control plate is selected according to the height of the high-height electronic device, and the position of the upper edge of the control plate is set sufficiently higher than the height of the high-height electronic device. Therefore, it is possible to prevent the air conditioning wind from hitting the side surface of the high-height electronic device.

By providing the curved portion on the upper side of the control plate which is curved toward the air conditioning wind side, when the electronic device is installed close to the wall, the air conditioning air blown by the air conditioner does not hit the wall. , It does not hinder the discharge of warm air of natural air cooling or forced air cooling rising from the exhaust hole of the ceiling plate of electronic equipment.

Further, in the case where the frame is fitted on the upper part of the rack, the conditioned air blown by the air conditioner does not hit the upper part of the side surface of the adjacent high-height electronic device. Therefore, the reflected air-conditioning air does not flow into the upper part of the electronic device, which does not hinder the discharge of warm air of natural air cooling or forced air cooling rising from the exhaust hole of the ceiling plate of the electronic device.

Further, since the frame has a chimney function, the cooling performance of the electronic equipment is improved.

[0024]

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

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing another embodiment of the present invention, FIG. 3 is a diagram showing the essential points of the embodiment of the present invention, and FIG. 4 is a diagram showing the present invention. It is a perspective view of another example of.

In the figure, the electronic unit 3 is a box-shaped shelf on which a large number of printed wiring boards are mounted in parallel. The shelf has a box shape with an open front surface, which is composed of upper and lower side plates, left and right side plates, and a backboard provided with a backboard connector. Guide rails are provided on the inside of each of the lower and upper plates of the shelf, and the upper and lower side edges of the printed wiring board are inserted into the guide rails, and the printed board connector is plugged into the opposing backboard connector to make the printed wiring board. Are installed in parallel.

Ventilation slits are formed in an array on the upper side plate and the lower side plate of the shelf of the electronic unit 3. The air intake / exhaust unit 4 has a frame shape whose four side surfaces are substantially the same as the plan view shape of the electronic unit 3 surrounded by the side plates, and the partition plate 4A is placed in the frame so as to be positioned on the diagonal line in the front downward direction in the side view. It is provided and divides the frame body into two spaces, diagonally above and diagonally below.

A window for sucking cool air is provided on the front side plate of the air intake / exhaust unit 4, and a window for discharging warm air is provided on the rear side plate. An electronic device 1 is configured by stacking an intake / exhaust air unit 4, an electronic unit 3, an intake / exhaust unit 4, and an electronic unit 3 in this order on a rack 2 installed on a floor from bottom to top.

A large number of exhaust holes are arranged in the ceiling plate 7 of the rack 2. Therefore, the cool air is sucked in from the window provided in the front part of the air intake / exhaust unit 4 and the front surface F of the electronic unit 3 to cool the electronic parts of the electronic unit 3, and the warm air K (indicated by the solid line) whose temperature has risen is generated in the rear space. 6 is lifted and discharged from the exhaust hole of the ceiling plate 7 to above the rack 2.

In the case of forced air cooling, although not shown, a fan unit is mounted between the electronic unit 3 and the upper air intake / exhaust air unit 4, and the front opening of the electronic unit 3 is closed by a front plate.

FIG. 1 shows an embodiment in which the electronic device 1 is arranged side by side with the high-height electronic device 60 and installed on the air conditioner side. Reference numeral 10 denotes a control plate in which the windward side of the conditioned air P (shown by the dotted line) is inclined downward toward the front. The control plate 10 has its lower side edge attached to the upper side of the rack 2 on the windward side (left side in the figure) of the conditioned air P. Therefore, the control plate 10 opens on the leeward side, and the ceiling plate 7
Is attached to the upper part of the rack 2 in a state of being inclined so as to cover the upper part of the rack.

The air-conditioning air P (shown by the dotted line) that is blown from the air conditioner and flows above the electronic device 1 flows obliquely upward along the control plate 10 to the electronic device 1 because of the above-described configuration. It does not hit the upper part of the side surface of the high-height electronic device 60 installed adjacently.

Therefore, the conditioned air P does not flow into the reflected conditioned air and does not flow into the upper part of the electronic device 1. Therefore, there is no obstacle to the discharge of the warm air K of natural air cooling or forced air cooling rising from the exhaust hole of the ceiling plate 7 of the electronic device 1.

When the conditioned air P is strong, the control plate 10
Since the static pressure in the vicinity of the upper side edge of N becomes negative, the warm air K discharge is urged. FIG. 2 shows an embodiment in which the electronic device 1 is installed near the wall 70.

Reference numeral 20 shown in FIGS. 2 and 3 indicates that the windward side of the conditioned wind P (shown by a dotted line) is inclined downward to the front, and the lower side edge of the conditioned wind P is set to the windward side of the conditioned wind P above the rack 2. It is a control plate attached to the edge (left side in the figure).

On the upper part of the control plate 20, there is formed a curved portion 21 which is curved toward the air conditioning airflow P side. The details of the structure with a variable mounting angle are shown in FIG. As shown in FIG. 3, the width of the control plate 20 is substantially equal to the width of the rack 2, and the lower side edge of the control plate 20 has a hinge 22.
Is connected to the side edge on the windward side of the conditioned air P above the rack 2.

An arm 23 projecting toward the ceiling plate 7 is provided at each of both ends of the lower side edge of the control plate 20, and a screw hole into which a screw portion of a bolt 24 is screwed is provided at a tip end portion of the arm 23. is there.

On the other hand, fixing metal fittings 25 that are in close contact with the arm 23 are attached so as to face both ends of the edge portion on the windward side (left side in the figure) of the conditioned air P above the rack 2, and the respective fixing metal fittings 25 are attached.
An arcuate hole 26 through which the threaded portion of the bolt 24 is loosely provided.

Therefore, when the bolt 24 is tightened after the control plate 20 is tilted at a desired angle, the control plate 20 maintains the tilt angle. As shown in FIG. 2, the control plate 20 is attached to the upper part of the rack 2 in a state where the windward side of the conditioned air P is inclined forward and downward by approximately 45 degrees, and the leeward side is open to cover the upper side of the ceiling plate 7. ing.

Therefore, the conditioned air P sent from the air conditioner
Rises obliquely upward along the control plate 20, reverses along the curved portion 21, and flows in the windward direction. Therefore, the electronic device 1
There is no obstacle to the discharge of the warm air K of natural air cooling or forced air cooling rising from the exhaust hole of the ceiling plate 7.

When the electronic device 1 is installed side by side with the high-height electronic device 60, the control plate is so placed that the curved portion 21 of the control plate 20 is sufficiently above the height of the high-height electronic device 60. The tilt angle of 20 shall be adjusted.

In FIG. 4, reference numeral 30 denotes a frame fitted on the upper part of the rack 2. The lower end surface of each frame 30 is used as an end surface having a step, and the step of the lowermost frame 30 is engaged with the upper edge of the rack 2 and fitted to the rack 2, and another frame 30 is placed on the upper stage thereof next. By fitting (three steps in the figure), the upper end surface of the uppermost frame 30 is made substantially equal to the height of the high-height electronic device 60.

Since the air-conditioning air P blown by the air-conditioner does not hit the upper portion of the side surface of the adjacent high-height electronic device 60 because of the above-mentioned structure. Therefore, the electronic device 1
It does not hinder the discharge of the warm air K of natural air cooling or forced air cooling that rises from the exhaust hole of the ceiling plate 7.

Further, since the frame 30 has a chimney function, the cooling performance of the electronic equipment is improved.

[0045]

Since the present invention is constituted as described above, it has the following effects.

Since the conditioned air flows obliquely upward along the control plate, it does not hit the upper part of the side surface of the high-height electronic device installed adjacent to the electronic device, and naturally rises from the exhaust hole of the ceiling plate of the electronic device. It does not hinder the discharge of warm air from air cooling or forced air cooling.

Therefore, the conditioned air blown by the air conditioner does not deteriorate the cooling performance of the electronic equipment. Even if the electronic device is installed close to the wall, the conditioned air blown by the air conditioner hits the upper part of the wall, so that the reflected conditioned air reflected by the wall does not flow toward the ceiling plate of the electronic device. Therefore, the conditioned air blown by the air conditioner does not deteriorate the cooling performance of the electronic device.

When the conditioned air is strong, the static pressure in the vicinity of the upper side edge of the control plate becomes a negative pressure, so that the discharge of warm air is urged.
By making the mounting angle of the control plate variable, it is possible to select the tilt angle of the control plate according to the height of the high-height electronic device, which is versatile.

The control plate having a curved portion on the upper side of the air-conditioning wind side is effective when applied to the case where the electronic device is installed close to the wall and does not deteriorate the cooling performance of the electronic device. The frame having the frame fitted to the upper part of the rack is applied to an electronic device installed side by side with a high-height electronic device, and has an effect of not lowering the cooling property of the electronic device.

Further, since the frame has a chimney function, the cooling performance of the electronic equipment is improved.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of the present invention.

FIG. 2 is a diagram of another embodiment of the present invention.

FIG. 3 is a diagram showing a main part of an embodiment of the present invention.

FIG. 4 is a perspective view of yet another embodiment of the present invention.

FIG. 5 is a side sectional view of an electronic device.

FIG. 6 is a diagram of a conventional example.

FIG. 7 is a diagram of another conventional example.

[Explanation of symbols]

 1 electronic device 2 frame 3 electronic unit 4 air intake / exhaust unit 4A partition plate 6 rear space 7 ceiling plate 10,20 control plate 21 curved part 22 hinge 25 fixing metal fitting 30 frame 60 high-height electronic device 70 wall 80 air conditioner P air conditioning wind K Warm air Pr Reflective air conditioning wind

Front page continued (72) Inventor Akemi Kasahara, 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (72) Inventor, Kunio Tadokoro, 1015, Kamikodanaka, Nakahara-ku, Kawasaki, Kanagawa Prefecture, Fujitsu Limited

Claims (4)

[Claims] 1. An electronic device having a structure in which warm air obtained by cooling electronic components housed in a rack is discharged from an exhaust hole provided in a ceiling plate of the rack, which is on the windward side of an conditioned air blown from an air conditioner. A cooling structure for an electronic device, comprising a control plate, which is installed on an upper edge portion of the rack so that a windward side of the conditioned air is inclined forward and downward and a leeward side is opened so as to cover an upper side of the ceiling plate. 2. The cooling structure for electronic equipment according to claim 1, wherein the mounting angle of the control plate is variable. 3. The cooling structure for an electronic device according to claim 1, further comprising a curved portion that is curved toward the air conditioning wind side at an upper portion of the control plate. 4. In an electronic device having a structure in which warm air obtained by cooling electronic components housed in the rack is discharged from an exhaust hole provided in a ceiling plate of the rack, the height is approximately equal to the height of adjacent high-height electronic devices. As described above, a frame is fitted to the upper part of the rack so as to provide a cooling structure for electronic equipment.