JP4599984B2 - Rack, electronic device mounting apparatus, and cooling method thereof - Google Patents

Description

  The present invention relates to a rack capable of mounting an electronic device therein, an electronic device mounting apparatus thereof, and a cooling method thereof.

  In general, a plurality of communication apparatuses are often mounted in a fixed space such as a standardized 19-inch rack. In recent years, with increasing market needs such as higher performance, more functions, and more channels, it has been emphasized how many communication devices can be mounted in the limited rack space. Accordingly, downsizing of communication devices is naturally progressing. Accordingly, in the communication device, heat concentration (higher heat density) due to high density mounting of electronic components is inevitable. As the heat density in the rack increases, especially for electronic parts with a severe operating temperature range, heat management that efficiently exhausts the heat in the rack and manages it at an appropriate temperature is very important. .

  A conventionally proposed cooling structure for a rack is shown in FIG. 15 (for example, FIG. 1 of Patent Document 1). Inside the rack 81, a plurality of unit devices 91 are mounted in multiple stages. An electronic component, a power supply unit, and the like (not shown) are mounted inside the unit device 91, and heat is generated from them. Therefore, the unit device 91 is provided with a fan 94 at the rear, an intake port 92 on the front surface, and an exhaust port 93 on the rear surface. The air sucked from the air inlet 92 by the fan 94 cools the heat inside the unit device 91, and the warm air is discharged from the air outlet 93. Further, the rack 81 is provided with an intake port 86 for taking in external air on the side surface 84 thereof. Thereby, the air taken into the rack 81 from the air inlet 86 is taken from the air inlet 92 of each unit device 91. The rack 81 is provided with an exhaust port 87 for exhausting air to the outside on the side surface 85. Thereby, the warm air discharged from the exhaust port 93 of each unit device 91 is discharged from the exhaust port 87 of the rack 81.

  In general, a gap exists between the rack 81 and the unit device 91 mounted therein due to the mounting structure. For this reason, a part of the warm air discharged from the exhaust port 93 of the unit device 91 passes through the gap between the side surface of the rack 81 and the unit device 91 and goes to the front surface of the unit device 91, and again the intake air in the unit device 91. A phenomenon of taking in from the mouth 92 occurs (hereinafter referred to as a circulation flow). As a result, the temperatures inside the rack 81 and the unit device 91 are increased, and the cooling efficiency is decreased. Therefore, in the structure of FIG. 15, a partition member 88 is arranged for each unit device 91. Thereby, the warm air exhausted from each unit device 91 is blocked by the partition member 88 and is not taken into another unit device 91 again.

Japanese Patent Laid-Open No. 5-128837

However, in the configuration as shown in FIG. 15, it is necessary to attach the partition member 88 for each unit device 91, which increases the number of parts. In addition, there is a problem that the installation work becomes complicated. Therefore, there is a problem that the cost is increased from the surface of the member and the man-hour. In the configuration of FIG. 15, since the partition members 88 that block between the unit devices 91 arranged in multiple stages are arranged, the circulation flow to other unit devices 91 can be prevented, but FIG. As shown, there is a fundamental problem that the circulation flow for each unit device 91 cannot be prevented. Therefore, there is a problem that the effect of suppressing the temperature rise cannot be obtained sufficiently.
[Object of the present invention]
Accordingly, it is an object of the present invention to provide a rack, an electronic apparatus mounting apparatus, and a cooling method thereof that can reduce an internal temperature rise with a simple configuration and method.

The rack according to the present invention is a rack in which a plurality of electronic devices are mounted, a main body, a first door attached to the main body so as to be openable and closable, and a first door attached at a position facing the first door. A plurality of electronic devices disposed and mounted on the inside of each of the first and second doors , an air inlet for sucking air into the rack, an air outlet for discharging air from the rack And a blocking means for blocking collectively a gap formed by the outside of the rack and the inside of the rack.

  As described above, the rack according to the present invention is provided with the blocking means that collectively blocks the gap formed by the outside of the plurality of electronic devices to be mounted and the inside of the rack, so that the electronic device mounted in the rack. It is possible to collectively block that the air that has been cooled and warmed flows backward through the gap and is taken into the electronic device again.

An electronic device mounting apparatus according to the present invention includes a rack and a plurality of electronic devices mounted inside the rack, and the rack includes a main body and a first door attached to the main body so as to be opened and closed. A second door attached to a position facing the first door, an intake port for sucking air into the rack, an exhaust port for discharging air from the rack, and the first and second doors, respectively. And a blocking means for blocking collectively a gap formed by the outside of the plurality of electronic devices and the inside of the rack.

  As described above, the electronic device mounting apparatus according to the present invention is mounted in the rack by including the blocking means that collectively blocks the gap formed by the outside of the plurality of electronic devices to be mounted and the inside of the rack. It is possible to collectively block that the air that has been cooled and warmed by the electronic equipment flowing back through the gap and taken into the electronic equipment again.

According to the cooling method for an electronic device mounting apparatus of the present invention, in a rack in which a plurality of electronic devices are mounted, a main body, a first door attached to the main body so as to be openable and closable, and the first door face each other. A second door mounted at a position, and sucks outside air from an intake port installed in the rack in response to heat generated in a plurality of electronic devices mounted in the rack. The outside air is taken into the plurality of electronic devices, the heat is cooled, and the air warmed by the cooling is exhausted from the inside of the plurality of electronic devices to the rack, and the warmed exhausted The warm air exhausted from the inside of the plurality of electronic devices is discharged from an exhaust port provided in the rack, and shut off means disposed inside each of the first and second doors. Backflow, Serial wherein the blocking collectively be taken back to the inside of the electronic device.

As described above, according to the cooling method of the electronic device mounting apparatus of the present invention, the air that has been cooled and warmed in the plurality of electronic devices is caused to flow backward by the blocking means disposed inside each of the first and second doors. Thus, it is possible to block all the electronic devices from being taken in again.

  The rack, the electronic device mounting apparatus, and the cooling method thereof according to the present invention have an effect of reducing an internal temperature rise by a simple configuration and method.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As Example 1 of the present invention, an example in which a communication device is used as an electronic device and a plate is used as a blocking means will be described.
[Description of configuration]
First, the configuration of the entire apparatus on which the rack, the communication apparatus, and the communication apparatus according to the first embodiment of the present invention are mounted will be described.

  1 shows the overall configuration of the electronic apparatus mounting apparatus including the rack and the mounted communication apparatus of the first embodiment, the configuration of the communication apparatus mounted in FIG. 2, and FIG. 3 shows the positions of the communication apparatus and the plate of the first embodiment. The schematic diagram which shows a relationship is shown.

  As shown in FIG. 1, the rack 1 can mount a plurality of communication devices 21 in multiple stages. Further, a part of the side surface of the rack 1 is constituted by a rack door 2 that is attached to the main body 13 so as to rotate and be opened and closed. Furthermore, a plate 3 is attached to the inside of the rack door 2 in the vertical direction. A similar rack door 2 and plate 3 are also attached to the side surface facing the rack door 2. Further, the rack 1 is provided with an intake port 6 for sucking air into the bottom plate 4 and an exhaust port 7 for discharging air into the top plate 5. In the present embodiment, taking into account high-density mounting of the rack 1 itself, an example in which the intake port 6 and the exhaust port 7 are installed on the bottom plate 4 and the top plate 5 is shown. With such a configuration, even if the racks 1 are mounted adjacent to each other, the intake port and the exhaust port are not blocked by the side surface of the adjacent rack.

  The communication device 21 includes various electronic components (not shown) for communication. The communication device 21 includes a transmission / reception function, a modulation function, a multiplexing / demultiplexing function, an amplification function, a signal reproduction function, and the like (not shown), and also includes a power supply unit and the like (not shown). As shown in FIG. 2, the communication device 21 is provided with an intake port 22 on the front surface and an exhaust port 23 on the rear surface. Further, a fan 24 is installed inside the communication device 21 so that the inside of the communication device 21 can be forcedly cooled.

  By closing the rack door 2 in FIG. 1, as shown in the schematic diagram in FIG. 3, the side surfaces of the communication devices 21 mounted in multiple stages are collectively sandwiched between the plates 3, and the side surfaces of the rack 1 and the communication device 21 are Can be prevented.

  In addition, about the wraparound of the air from the up-down direction of the communication apparatus 21, since it is mounted without a gap by high-density mounting, it is negligible. When a shelf (not shown) is provided for mounting each communication device 21, there is no substantial gap between the upper and lower sides of each communication device 21.

  Next, the configuration of the first embodiment of the present invention will be described in more detail with reference to FIGS. 4 and 5. FIG. 4 is a cross-sectional view of the first embodiment, and FIG. 5 is a detailed view of the fixing portion of the plate of the first embodiment.

  As shown in FIG. 4, the plate 3 installed on the inside is configured to sandwich the communication device 21 by closing the rack door 2. As a result, a gap formed between the side surface of the rack 1 and the side surface of the communication device 21 is closed. The communication device 21 is fixed to the column 10 or the like directly or via a fixing member or the like with respect to the main body of the rack 1.

  The plate 3 can be fixed to the rack door 2 by various configurations. FIG. 5 (a) shows an example of fixing with screws 11, and FIG. 5 (b) shows an example of fixing with rivets 12 such as nylon. In addition, the plate may be fixed to the rack door by bonding or welding. The plate can be formed of metal such as aluminum, iron, copper, stainless steel, brass, other alloys, plastic, ceramics, or the like. In particular, sheet metal is excellent in availability, easy to process, and can be manufactured at low cost.

[Description of operation]
Next, the operation of the first embodiment of the present invention will be described.
First, cooling in the communication device 21 will be described with reference to FIG.
When the communication device 21 is driven, heat is released from an internal power supply unit or the like. In order to cool this, the inside of the apparatus is forcibly cooled. By driving a fan 24 installed inside the communication device 21, air is taken in from the air inlet 22. The heat generated in the communication device 21 is cooled by the introduced air. The air that has cooled and heated is forcibly exhausted from the exhaust port 23 by the fan 24.

  Next, the overall operation of the first embodiment of the present invention will be described with reference to FIG. FIG. 6 schematically shows the entire air flow in the rack.

  As described above, the heat generated in the communication device 21 is cooled by the air taken in from the intake port 22 by driving the fan 24 and is forcibly exhausted from the exhaust port 23. Since the exhausted air is warm, the specific gravity is reduced and buoyancy is generated, and the air flows toward the top plate 5 of the rack 1. This is called the chimney effect. In this way, the heated air discharged from the exhaust port 23 of each communication device 21 goes to the upper side of the rack 1 one after another, and this flow is further increased. As shown in FIG. 6, this chimney effect is enhanced when the space formed on the right side of the rack 1 is long in the vertical direction. Thus, the space on the right side of the rack 1 serves as the exhaust duct 9.

  On the other hand, in the space on the left side of the rack 1, air is sucked from the air inlet 22 by the fan 24 of each communication device 21, and the pressure tends to be reduced. Therefore, new air is taken in from the intake port 6 installed in the bottom plate 4 of the rack 1 so as to compensate for this. Air sucked from the air inlet 6 passes through the space on the left side of the rack 1 and is supplied to each communication device 21. Thus, the space on the left side of the rack 1 serves as the intake duct 8. Therefore, as a whole of the rack 1, an air flow is created in which new air is sucked from the intake port 6 and cooled air is discharged from the exhaust port 7.

  Here, in the first embodiment of the present invention, as described above, the plate 3 is installed inside the rack door 2 as shown in FIG. Therefore, the gap formed between the rack 1 and the side surface of the communication device 21 is closed. For this reason, the warm air discharged from the exhaust port 23 of the communication device 21 does not go around the intake port 22 through the gap between the rack 1 and the communication device 21. Therefore, the warm air is not sucked from the intake port 22 again. In this way, with the plate 3 as a boundary, the left side of the rack 1 serves as the intake duct 8 and the right side serves as the exhaust duct 9. Therefore, in the rack 1, the air flow from the intake port 6 to the exhaust port 7 is improved, and the heat in the rack 1 can be efficiently discharged outside.

  As described above, since there is no substantial gap between the upper and lower sides of each communication device 21 due to a shelf or the like, or only an extremely narrow gap exists, there is almost no air wraparound.

[Explanation of characteristic results]
Next, the characteristic result of the Example of this invention is demonstrated.
The temperature rise inside the apparatus was confirmed by thermal simulation. Table 1 shows the analyzed conditions.

[Table 1]
(Analysis conditions)
・ Rack outline: W600 × D600 × H2200 mm
・ Appearance: W450 × D440 × H260 mm
・ Power consumption: 1140W (= 190W / device x 6 stages)
・ Environmental temperature: T = 40 ℃
・ Cooling method: Forced air cooling (fan: 90 squares x 4 / device)
Based on the above analysis conditions, analysis results of thermal simulation are shown for the case of the conventional configuration (without a plate) and the case of Example 1 (with a plate). FIG. 7 shows the temperature distribution in the case of the conventional configuration, and FIG. 8 shows the temperature distribution in the case of the first embodiment. As shown in FIG. 7, in the conventional configuration, the ambient temperature in the apparatus rises as it goes up, and exceeds 65 ° C. at the top. On the other hand, as shown in FIG. 8, in Example 1, the atmospheric temperature in the apparatus does not exceed 55 ° C.

  Next, Table 2 shows the result of the surface temperature of the electrical component (optical device) that is most likely to fail inside the apparatus as the ambient temperature in the apparatus rises.

[Table 2]
Surface temperature of electrical components (optical devices)
Conventional Configuration Example 1 Improvement Effect
Without plate With plate Top stage 73.8 ° C 54.7 ° C 19.1 ° C
Bottom stage 62.9 ° C 54.1 ° C 8.8 ° C
From the results in Table 2, the effect of temperature reduction was confirmed by attaching the plate. Here, the upper limit temperature that the electrical component (optical device) can withstand was assumed to be 65 ° C. On the other hand, in the uppermost stage of the rack, it is over about 9 ° C. without a plate, but with a plate, a margin of about 10 ° C. is obtained.

[Description of effects]
Next, effects of the first embodiment of the present invention will be described.
As described above, in the first embodiment of the present invention, the temperature inside the rack is increased by a simple configuration and method in which a plate is attached to the inside of the side surface of the rack and the side surfaces of the communication devices installed in multiple stages are shut off collectively. It has the effect that can be reduced. In addition, since there is no need to install each communication device, the number of parts can be reduced.

  In addition, when the plate is installed on a rack door that can be opened and closed, the plate can be easily attached or removed. This is because attachment or removal work can be performed with the door open. Further, the plate can be easily moved away from the position where the communication device is mounted by opening the door. Therefore, when the communication device is mounted in the rack, the plate does not interfere and can be mounted without being aware of the plate.

  Further, the plate can be formed of metal, plastic, or the like. Particularly, when the plate is formed of sheet metal, it can be easily processed and can be manufactured at low cost.

(Modification 1 of Example 1)
In the above, an example in which a plate is used as the means for blocking the gap has been shown, but other shapes may be used. FIG. 9 shows a configuration in which a block having a block shape is attached. Here, (a) is a block 31, and (b) is a plate 32 processed into a block. In addition, if the structure can block the gap, the cross-sectional shape is L-shaped, T-shaped, U-shaped, V-shaped, H-shaped, circle, semicircle, ellipse, a shape including a partial arc, The shape is not particularly limited, such as a polygon. Thus, a free shape can be selected as the means for blocking.

(Modification 2 of Example 1)
Moreover, what interrupts | blocks the backflow of air, such as a plate and a block, may be integrally formed with a rack door. Thereby, the number of parts can be further reduced. Further, the work of attaching the plate is not necessary.

(Modification 3 of an Example)
Further, as shown in FIG. 10, the plate 3 may be attached to the rack door 2 in accordance with the height and width where the communication device is actually mounted. In other words, the plate 3 does not have to be attached to the entire length of the rack door 2 and may be attached so as to cover only the place where the communication device is mounted. FIG. 10A shows an example in which the width of the plate 3 is changed, and FIG. 10B shows an example in which the attachment position of the plate 3 is changed. Thus, the plate 3 may change the width according to the width in the height direction in which the communication device is mounted, or may change the attachment position according to the position where the communication device is mounted.

  Next, as a configuration for further improving the air flow, a plate 41 protruding toward the bottom surface of the communication device 21 may be attached to the inside of the bottom plate 4 on the exhaust duct 9 side as shown in FIG. Similarly, a plate 42 protruding toward the communication device 21 may be attached inside the intake duct 8 of the top plate 5. In the second embodiment, air taken in from the intake port 6 can be prevented from flowing to the exhaust duct 9 side through the gap between the bottom surface of the communication device 21 and the rack 1. Similarly, it is possible to further prevent the air discharged from the exhaust port 7 from flowing toward the intake duct 8 through the gap between the upper surface of the communication device 21 and the rack 1. Therefore, the air flow of the entire rack is further improved, and the temperature rise inside the rack can be reduced more efficiently.

  In addition, as a configuration for further improving the air flow, as shown in FIG. 12, the installation position of the intake port 56 of the rack 51 is shifted to the intake duct 58 side, and the installation position of the exhaust port 57 is changed to the exhaust duct. It may be shifted to the 59 side. In the third embodiment, similarly to the second embodiment, the air taken in from the intake port 56 hardly flows to the exhaust duct 59 side, and the air discharged from the exhaust port 57 hardly flows to the intake duct 58 side. Therefore, the air flow of the entire rack 51 is further improved, and the temperature rise inside the rack can be reduced more efficiently.

  In the first to third embodiments, the rack configuration in which the air inlet is provided on the bottom plate and the air outlet is provided on the top plate is shown. However, the air inlet and the air outlet may be provided on the side surface. FIG. 13 shows a fourth embodiment in which an intake port 66 and an exhaust port 67 are provided on each of the opposing side surfaces. In addition, (a) is a longitudinal cross-sectional view, (b) is a cross-sectional view. As illustrated in FIG. 13B, the gap between the side surfaces of the rack 61 and the communication device 21 is blocked by the plate 63. Therefore, it is possible to prevent warm air exhausted from each communication device 21 from passing through the gap between the rack 61 and the communication device 21 to the intake port 22 side of the communication device 21.

  In the embodiments so far, in order to increase the mounting capacity of the communication devices in the rack or to reduce the cost, the rack as a whole has a configuration in which no fan is installed. However, as a fifth embodiment, in order to further reduce the temperature rise, a fan 72 may be installed at the upper or lower portion of the rack 71 to increase the air volume in the rack 71 as shown in FIG. Thereby, it becomes possible to further reduce the temperature rise.

  Examples of utilization of the present invention include not only communication devices that perform transmission / reception and relaying, but also switching devices such as routers, information processing devices such as servers, and storage devices that store data such as disk devices.

It is a block diagram which shows the whole structure of Example 1 of this invention. It is a block diagram which shows the structure of the communication apparatus in Example 1 of this invention. It is a schematic diagram which shows the positional relationship of the communication apparatus of Example 1 of this invention, and a plate. It is a cross-sectional view of Example 1 of the present invention. It is detail drawing of the fixing | fixed part of the plate of Example 1 of this invention. In addition, (a) shows the example fixed with a screw, (b) shows the example fixed with a rivet. It is a longitudinal cross-sectional view explaining the flow of the air of Example 1 of this invention. It is a schematic diagram which shows the thermal simulation result in the conventional structure. It is a schematic diagram which shows the thermal simulation result of Example 1 of this invention. It is a block diagram of the modification 1 of Example 1 of this invention. In addition, (a) is a block, (b) is the structure which processed the plate-shaped thing into the block shape. It is a block diagram which shows the attachment variation of a plate as the modification 3 of Example 1 of this invention. (A) shows an example of changing the width of the plate, and (b) shows an example of changing the mounting position of the plate. It is a block diagram of Example 2 of this invention. It is a block diagram of Example 3 of the present invention. It is a block diagram of Example 4 of this invention. In addition, (a) is a longitudinal sectional view, and (b) is a transverse sectional view. It is a block diagram of Example 5 of this invention. It is a longitudinal cross-sectional view which shows the conventional rack and the unit apparatus mounted. It is a longitudinal cross-sectional view which shows the circulation flow in the conventional rack and the mounted unit apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rack 2 Rack door 3 Plate 4 Bottom plate 5 Top plate 6 Intake port 7 Exhaust port 8 Intake duct 9 Exhaust duct 11 Screw 12 Rivet 13 Rack main body 21 Communication apparatus 22 Intake port 23 Exhaust port 24 Fan

Claims (28)

In racks with multiple electronic devices inside,
A main body, a first door attached to the main body so as to be openable and closable, and a second door attached to a position facing the first door;
An air inlet for sucking air into the rack;
An exhaust outlet for exhausting air from the rack;
Disposed inside each of the first and second doors, is provided with a blocking means that collectively blocks a gap formed by the outside of the plurality of electronic devices to be mounted and the inside of the rack. And rack. The rack according to claim 1, wherein the first and second doors are rotatably attached to the main body of the rack. The rack according to claim 1 or 2, wherein the blocking means is a plate. The rack according to claim 1 or 2, wherein the blocking means is a block. The rack according to any one of claims 1 to 4, wherein the blocking means is made of metal. The rack according to claim 5, wherein the blocking means is formed of sheet metal. The rack according to any one of claims 1 to 4, wherein the blocking means is made of plastic. The rack according to any one of claims 1 to 7, wherein the blocking means is integrally formed with the first or second door. The rack according to any one of claims 1 to 8, wherein the blocking means is disposed in a height range in which the plurality of electronic devices are mounted. The rack according to any one of claims 1 to 9, wherein the intake port is provided on a bottom plate of the rack, and the exhaust port is provided on a top plate of the rack. The rack according to any one of claims 1 to 9, wherein the intake port and the exhaust port are provided on opposite sides of the rack. The rack according to any one of claims 1 to 11,
Furthermore, the rack characterized by the fan being installed. Rack,
A plurality of electronic devices mounted inside the rack,
The rack is
A main body, a first door attached to the main body so as to be openable and closable, and a second door attached to a position facing the first door;
An air inlet for sucking air into the rack;
An exhaust outlet for exhausting air from the rack;
An electronic device disposed inside each of the first and second doors, and further comprising: blocking means for collectively blocking gaps formed by the outside of the plurality of electronic devices and the inside of the rack. Equipment mounted equipment. Wherein the first and second doors, with respect to the body of the rack, an electronic device mounting apparatus of claim 1 3, wherein the pivotably mounted. It said interrupting means, the electronic device mounting apparatus according to any one of claims 1 3 or claim 1 4, characterized in that a plate. It said interrupting means, the electronic device mounting apparatus according to any one of claims 1 3 or claim 1 4, characterized in that a block. It said interrupting means, the electronic device mounting apparatus according to any one of claims 1 3 to claims 1 to 6, characterized in that it is formed of metal. The electronic device mounting apparatus according to claim 17 , wherein the blocking means is formed of sheet metal. It said interrupting means, the electronic device mounting apparatus according to any one of claims 1 3 to claims 1 to 6, characterized in that it is formed of plastic. It said interrupting means, the electronic device mounting apparatus according to any one of claims 1 3 through claim 19, wherein the being the door and integrally molded. It said interrupting means, the electronic device mounting apparatus according to any one of claims 1 3 through claim 2 0, wherein the plurality of electronic devices are arranged in a range of height to be mounted. Wherein the bottom plate of the air inlet is said rack, an electronic device mounting apparatus according to any one of claims 1 3 through claim 2 1, wherein said exhaust port, characterized in that provided on the top plate of the rack. The intake port and the exhaust port, the electronic device mounting apparatus according to any one of claims 1 3 through claim 2 1, characterized in that are provided on opposite sides of the rack. The electronic device mounting apparatus according to any one of claims 1 3 through claim 2 3,
Furthermore, the electronic device mounting apparatus characterized by the fan being installed. Wherein the plurality of electronic devices, an intake port for sucking air, electronic equipment mounting apparatus according to any one of claims 1 3 to claims 2 to 4, characterized in that an exhaust port for discharging air . The electronic device mounting apparatus according to claim 25 , wherein the plurality of electronic devices further include a fan inside. A rack according to any one of claims 1 to 1 2,
A plurality of electronic devices mounted inside the rack,
The plurality of electronic devices are provided with an intake port for sucking air on a front surface and an exhaust port for discharging air on a rear surface,
The blocking means is disposed inside each of the first and second doors, and has a gap between a side surface located between the air inlet and the air outlet of the plurality of electronic devices and the inside of the rack. Electronic equipment mounting device characterized by blocking. In racks with multiple electronic devices inside,
A main body, a first door attached to the main body so as to be openable and closable, and a second door attached to a position facing the first door,
For heat generated inside a plurality of electronic devices mounted in the rack,
Inhale outside air from the air intake installed in the rack,
The inhaled outside air is taken into the plurality of electronic devices, the heat is cooled,
The air warmed by cooling is exhausted from the inside of the plurality of electronic devices to the rack,
The exhausted warm air is discharged from the exhaust port installed in the rack,
The blocking means disposed inside each of the first and second doors collectively causes the warm air exhausted from the plurality of electronic devices to flow backward and be taken into the electronic devices again. A method for cooling an electronic device mounting device, characterized in that the electronic device is blocked.

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