JP2008200472A - Electronic device and fire preventing mechanism of electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device and a fire preventing mechanism of the electronic device capable of improving self-extinguishing function as the device by improving the cooling capability as the device, preventing the fire spread to the outside even if fire breaks out indoor, and exhausting high-temperature heat and flammable gases to the outside. <P>SOLUTION: This electronic device 15 having an exhaust opening 25 configured to exhaust air outside includes a door part 30 configured to close the exhaust opening 25 when the electronic device has a predetermined temperature, wherein the door part 30 is rotated based on the own weight of the door part 30 and a wind pressure of the air taken in the electronic device and exhausted outside the electronic device, so that the exhaust opening 25 is closed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic device and a fire prevention mechanism of the electronic device, and more specifically, for example, an electronic device configured by mounting a plurality of electronic circuit units in a shelf and having a self-extinguishing function, and fire prevention of the electronic device. Regarding the mechanism.

  Conventionally, in an electronic device such as a communication device, a plurality of plug-in units (PIU: Plug In Unit) in which electronic components are mounted on a printed wiring board are accommodated in a shelf, and a plug-in method using a connector of the plug-in unit is used. A structure is adopted in which one electronic device is configured by being mounted on a backboard provided in the shelf, and the plurality of electronic devices are mounted in a plurality of stages in a superimposed manner in a cabinet.

  FIG. 1 is a perspective view of a conventional electronic device. Referring to FIG. 1, in a conventional electronic device 10, an electronic component such as an IC (Integrated Circuit) or an LSI (Large Scale Integration circuit) is printed on a printed circuit board (surface on the X1 side in FIG. 1). 1 is provided with a plurality of plug-in units (not shown) inserted in the X2 direction of FIG.

  On the back surface of the electronic device 10 (the surface on the X2 side in FIG. 1), the sub backboard 2 on which an external interface connector is disposed is provided outside the backboard 3.

  Also, since the temperature inside the electronic device 10 rises due to the heat generated by the electronic components and the like, a fan (not shown) is used as a forced air-cooling cooling means to keep the temperature inside the electronic device 10 at a desired temperature. It is provided in the lower part of the apparatus 10.

  With such a fan, air is forcibly taken in from the outside in the Z1 direction in FIG. 1 (intake), is circulated inside the electronic device 10, cools the electronic components that are generating heat, and the back surface of the electronic device 10 ( Warmed air is exhausted (exhausted) to the outside through an exhaust port 4 provided on the upper portion of the surface (X2 side in FIG. 1).

  By the way, such an electronic device is required to have a sufficient self-extinguishing function so that it does not burn like other electronic devices when a fire occurs inside. Therefore, in the electronic device 10, a punching metal 5, which is a metal plate in which many predetermined opening holes are formed, is attached to the exhaust port 4 in order to prevent the electronic device 10 from spreading to the outside. Even if a fire occurs inside the electronic device 10, the punching metal 5 prevents a fire from occurring outside the electronic device 10.

  Moreover, the punching metal 5 is coated with a foamed paint that foams when touched by a flame or a high-temperature gas, if necessary. When a fire occurs inside the electronic device 10 and the temperature rises to a predetermined temperature or higher due to heating, the paint foams, and a large number of opening holes formed in the punching metal 5 are sealed with the paint. As a result, the fire outside the electronic device 10 is prevented.

  In addition, for example, when a high temperature fuse has to be used, a ventilation port in which the shape of the thermal fuse is changed depending on the temperature has been proposed in order to prevent the low temperature fuse from being used by mistake (Patent Document). 1).

Furthermore, a mechanism has been proposed in which a butterfly damper is closed by a closing spring and a thermal fuse in the event of a fire (see Patent Document 2).
JP 2001-33089 A JP 2001-104503 A

  However, in such a conventional electronic device 10, since the punching metal 5 is attached to the exhaust port 4 for exhausting the air that has circulated inside the electronic device 10 to the outside, it is discharged to the outside of the electronic device 10. Will interfere with the air flow. Therefore, the cooling performance of the electronic parts that generate heat is reduced.

  Further, since the air flow discharged to the outside of the electronic device 10 is hindered by the punching metal 5, when a fire occurs inside the electronic device 10, high-temperature heat and flammable gas that has not yet burned are generated in the inside. It may become difficult to extinguish due to fullness and may hinder the self-extinguishing function.

  Furthermore, the above-mentioned foamed paint coated on the punching metal 5 cannot be easily obtained, and the cost is high.

  Therefore, the present invention has been made in view of the above points, and while improving the cooling performance as an apparatus, it prevents the spread of fire to the outside even when a fire occurs inside, while maintaining high temperature heat. It is an object of the present invention to provide an electronic device and a fire prevention mechanism for the electronic device that can improve the self-extinguishing function of the device by discharging gas or flammable gas to the outside.

  According to one aspect of the present invention, an electronic device having an exhaust port for exhausting air to the outside, comprising a door portion that closes the exhaust port when a predetermined temperature is reached, An electronic device is provided in which the exhaust port is closed by rotating the door portion based on the wind pressure of air taken into the electronic device and discharged to the outside.

  The door portion may be provided with a heat generation sensing member, and the door portion may be rotated by the operation of the heat generation detection member. The door portion is rotatably provided on a top plate of the electronic device, and the heat detection member is a first metal plate attached to the door portion and a second metal plate attached to the top plate. The first metal plate and the second metal plate may be bonded with a hot melt material.

  According to another aspect of the present invention, there is provided a fire prevention mechanism for an electronic device having an exhaust port for exhausting air to the outside. When a predetermined location inside the electronic device reaches a predetermined temperature, heat generation is detected. When the member is actuated, the door is unattached to the top plate, and the door rotates based on the weight of the door and the wind pressure of the air taken into the electronic device and discharged to the outside. And the fire prevention mechanism of the electronic device characterized by closing the said exhaust port by the said door part is provided.

  A plurality of the door portions for closing the exhaust port are provided, each door portion is provided with a heat generation temperature sensing member, and the door portion located immediately above the heat generation source is operated by the heat generation detection member provided on the door portion. When the temperature is reached, the heat detection member rotates based on the operation, closes the exhaust port, and the portion of the door portion provided at another location that does not reach the operation temperature of the corresponding heat detection member The door part may be in a state in which the exhaust port remains open.

  According to still another aspect of the present invention, an electronic apparatus having an exhaust port for exhausting air to the outside, the door unit closing the exhaust port when rotated, and a substantially full width of the door unit. A linear member that is stretched over and holds the door portion in an open state with respect to the exhaust port, and the linear member is cut or extended to a predetermined length or more, thereby the door portion is An electronic device is provided that rotates by its own weight to close the exhaust port.

  The exhaust port is provided with an elastic member, and the elastic member is elastically deformed by being attached to the linear member, and the elastically deformed elastic member supports the door portion and exhausts the door portion to the exhaust port. The open state is maintained with respect to the mouth, and when the linear member is cut or stretched to a predetermined length or more, the elastic member is restored, the support of the door part is released, and the door part is caused by its own weight. The exhaust port may be closed by turning.

  According to still another aspect of the present invention, there is provided a fire prevention mechanism for an electronic device having an exhaust port for exhausting air to the outside, wherein the electronic device closes the exhaust port when rotated. And a plurality of linear members that are stretched corresponding to each of the door portions and hold the door portion in an open state with respect to the exhaust port, and the linear members are cut or predetermined When extended beyond the length, the door portion rotates by its own weight to close the exhaust port, and when a fire occurs in the electronic device, at least one of the plurality of door portions is the exhaust port. And a fire prevention mechanism for the electronic device is provided in which at least one door portion maintains the open state of the exhaust port.

  According to the present invention, it is possible to improve the cooling performance of the apparatus and prevent the spread of fire to the outside even if a fire occurs inside, while discharging high-temperature heat and flammable gas to the outside. Thus, it is possible to provide an electronic device and a fire prevention mechanism for the electronic device that can improve the self-extinguishing function.

  Embodiments of the present invention will be described below.

1. First Embodiment of the Invention First, the structure of an electronic device according to a first embodiment of the present invention will be described, and then the operation thereof will be described.

[Structure of electronic device]
FIG. 2 is a front view of an electronic apparatus in which the electronic device according to the first embodiment of the present invention is provided in three stages. FIG. 3 is a rear perspective view of the electronic device according to the first embodiment of the present invention when viewed from below.

  Referring to FIG. 2, an electronic device 20 provided with the electronic device 15 according to the first embodiment of the present invention includes a plug-in unit (PIU: Plug In Unit, in which electronic components are mounted on a printed wiring board). A plurality of (not shown) are accommodated in the shelf S, and are mounted on a backboard provided in the shelf S by a plug-in method using a connector of the plug-in unit to constitute one electronic device 15. In the example shown in FIG. 2, three electronic devices 15 are attached in a cabinet 16 so as to be arranged in multiple stages (three stages in the example shown in FIG. 2). Each electronic device 15 (shelf S) is detachably attached to the cabinet 16 at a predetermined interval.

  Referring to FIG. 3, an electronic component such as an IC (Integrated Circuit) or an LSI (Large Scale Integration circuit) is printed on the shelf S provided on the front surface (X1 side surface of FIG. 3) of the electronic device 15. A plurality of the plug-in units mounted on the wiring board are inserted in the X2 direction in FIG. 3 with the main surface of the printed wiring board positioned in a direction perpendicular to the ground.

  A metal partition plate 24 (see FIG. 2) is provided in the shelf S, and partitions the slots in the shelf S. Thereby, when the electronic component of the plug-in unit or the printed wiring board burns due to a fire or the like, it is possible to prevent the flame from moving to the adjacent plug-in unit.

  The metal partition plate 24 (see FIG. 2) is provided up to a height at which the upper end of the printed wiring board of the plug-in unit is located, but is located above the back of the electronic device 15 (the surface on the X2 side in FIG. 3). It is not provided at a location where the exhaust port 25 formed with an opening is located, and a partition from an adjacent slot is not provided at the location.

  The exhaust port 25 formed in the upper part of the back surface of the electronic device 15 (the surface on the X2 side in FIG. 3) is closed by the rotation of the door 30 which will be described in detail later. In the example shown in FIG. 3, eight door portions 30 are provided, and when all the eight door portions 30 are rotated, the entire exhaust port 25 is closed.

  At the upper end of the electronic device 15, as shown by a dotted line in FIG. 3, the top plate 26 is provided obliquely with respect to the horizontal plane (XY plane). As a result, the upper end of the electronic device 15 is positioned such that the back side (X2 side in FIG. 3) is higher than the front side (X1 side in FIG. 3), and the exhaust port is located above the back side (surface on the X2 side in FIG. 3). An opening 25 is formed.

  Further, since the internal temperature of the electronic device 15 rises due to the heat generated by the electronic components and the like, the fan 27 is provided as a forced air cooling type cooling unit to maintain the internal temperature at a desired temperature. A plurality is provided at the bottom. That is, in the electronic device 15 of this example, an air inlet is formed at the lowermost portion of the device. In FIG. 2, the position where the fan 27 is provided is indicated by hatching for easy understanding.

  With such a fan 27, air is forcibly taken in (intake) from the outside in the Z1 direction in FIG. 3, and is circulated from the bottom to the top inside the electronic device 15 as shown by the black arrows in FIG. Cool down the electronic parts. The warmed air is bent in the direction of the inner surface of the top plate 26 provided obliquely at the upper end of the electronic device 15, and is provided on the upper portion of the back surface (the surface on the X2 side in FIG. 3) of the electronic device 15. Then, it is discharged (exhausted) to the outside through the exhaust port 25. In this way, a cooling structure is formed for each electronic device 15 by a series of air flows, that is, intake by the fan 27 and exhaust through the exhaust port 25. The fan 27 is set so as not to stop even if a fire occurs in the slot of the shelf S.

  Further, in the electronic apparatus 20 having a structure in which the electronic device 15 is mounted in a three-tiered manner in the cabinet 16 in a superimposed manner, as shown by a white arrow in FIG. Along the outer surface of the plate 26, it is taken into the fan 27 of the electronic device 15 provided immediately above it. Therefore, the top plate 26 provided obliquely at the upper end of one electronic device 15 can guide the air that has circulated through the electronic device 15 to the exhaust port 25, and the electronic device 15 provided immediately above the electronic device 15. The air taken into the fan 27 can be guided, the height of the electronic device 15 can be shortened, and a cabinet with a low height can be accommodated.

  As shown in FIGS. 2 and 3, a cable duct 28 is provided under the shelf S on the back surface (the surface on the X1 side in FIG. 3) of the electronic device 15, and is connected to the printed wiring board of the plug-in unit. The cable thus obtained is accommodated in the cable duct 28. Inside the electronic device 15, air taken in from the fan 27 is rectified and distributed in the shelf S at a location corresponding to the location where the cable duct 28 is located.

  Further, on the back surface of the electronic device 15 (the surface on the X2 side in FIG. 3), a sub backboard 22 provided with a connector for an external interface is provided outside the backboard 23.

  Here, the door portion 30 and the surrounding structure will be described with reference to FIG. As described above, in this example, eight door portions 30 are provided, but each has the same structure. Therefore, in the following description, one door portion 30 and the surrounding structure are described, and the other doors are described. It will be replaced with the description of the structure of the part 30 and its periphery.

  4 is a cross-sectional view of the upper portion of the electronic device 15 taken along line AA in FIG. The front side (X1 side in FIG. 3) of the electronic device 15 corresponds to the left side in FIG. 4, and the back side (X2 side in FIG. 3) of the electronic device 15 corresponds to the right side in FIG.

  Referring to FIG. 4, a top plate 26 is provided obliquely with respect to the horizontal plane at the upper end of the electronic device 15, and an exhaust port 25 is formed in the upper part of the back surface of the electronic device 15. On the back side of the electronic device 15 further than the exhaust port 25, the top plate 26 is formed substantially parallel to the horizontal plane. Below, the location arrange | positioned diagonally with respect to a horizontal surface among the top plates 26 is called the inclination part 26-1, and the location arrange | positioned substantially parallel with respect to a horizontal surface is called the horizontal part 26-2.

  The horizontal part 26-2 of the top plate 26 is provided with a shaft fitting 31 such as a hinge as a member for rotating the door part. The shaft fitting 31 is substantially composed of one rotating shaft 31-1 and two metal plates 31-2 and 31-3 rotatably connected to the rotating shaft 31-1, and one metal plate 31 is provided. -2 is fastened to the horizontal portion 26-2 of the top plate 26 with screws or the like, and the other metal plate 31-3 is fastened to the door portion 30 with screws or the like. The rotating shaft 31-1 of the shaft fitting 31 is located in the vicinity of the connection portion between the inclined portion 26-1 and the horizontal portion 26-2 of the top plate 26.

  Therefore, the door part 30 fastened to the metal plate 31-3 can be rotated around the rotation shaft 31-1 of the shaft fitting 31.

  In addition, a stopper 32 is provided as a door portion rotation stop member at the lower portion of the exhaust port 25 so as to stop the rotation of the door portion 30 in a direction perpendicular to the horizontal plane. As shown in FIG. 3, the stopper 32 has a shape in which a U-shape is rotated 90 degrees counterclockwise when viewed from the back side of the electronic device 15, that is, the side surface of the electronic device 15 (Y1 in FIG. 3). , The surface on the Y2 side) has a predetermined length in the vertical direction (Z1-Z2 direction) and is bent in the width direction (Y1-Y2 direction) of the electronic device 15.

  In addition, you may set the door part 30 to the magnitude | size of about 65 * 55 mm, for example.

  Reference is also made to FIG. FIG. 5 is a perspective view showing the structure of the door 30 and the periphery thereof, and the door 30 and the periphery thereof are viewed from the direction indicated by the arrow B with the top plate 26 and the shaft bracket 31 shown in FIG. 4 removed. FIG. A metal plate 31-3 of the shaft fitting 31 shown in FIG. 4 is joined to a part of the upper surface of the door 30 shown in FIG.

  Further, a thermal fuse 33 serving as a heat generation detection member is provided on the upper surface of the door portion 30 on the side facing the portion where the metal plate 31-3 of the shaft fitting 31 shown in FIG. Is installed.

  The thermal fuse 33 is formed by bonding a first metal plate 34 and a second metal plate 35 with a hot-melt material, the details of which will be described later.

  The first metal plate 34 has a predetermined length and a predetermined length on the upper surface of the door portion 30 by welding or a fastening member such as a screw, where the metal plate 31-3 of the shaft fitting 31 shown in FIG. 4 is joined. It is attached to the side facing away.

  The second metal plate 35 has a convex shape in plan view, and has a main body portion 35-1 and a convex tip portion 35-2 extending from the main body portion 35-1. A through hole 36 is formed in the main body 35-1 of the second metal plate 35. As shown in FIG. 4, the screw 37 is fitted into the through hole 36 of the second metal plate 35 and the through hole (not shown) formed in the inclined portion 26-2 of the top plate 26. The second metal plate 35 and the inclined portion 26 of the top plate 26 are joined.

  As described above, the first metal plate 34 and the second metal plate 35 having such a structure are bonded with a hot melt material. Such an adhesive structure will be described below.

  In this example, paste solder is used as the hot melt material. For example, lead-free solder may be used in consideration of environmental influences. Printing is performed using a metal mask at a bonding location described later, and melt-bonded in a furnace to provide solder. By such a method, the amount of solder adhesion can be stabilized. In general, it is difficult to solder a metal plate because heat escapes, but soldering can be easily performed by performing soldering using reflow as described above.

  However, the hot melt material for bonding the first metal plate 34 and the second metal plate 35 is not limited to solder, and for example, a thermoplastic adhesive may be used as the hot melt material.

The heat-melting material is provided on a part of the front end side of the lower surface of the convex front end portion 35-2 of the second metal plate 35 having a convex shape in plan view. The formation area of the hot melt material in the convex tip portion 35-2 is set to an area having a strength necessary for the convex tip portion 35-2 to maintain impact resistance. For example, the formation width of the hot melt material may be set to about 3 mm, and the formation area may be set to about 5 to 25 mm ² .

  The first metal plate 34 and a part of the tip side of the lower surface of the convex tip portion 35-2 of the second metal plate 35 are bonded to each other through the hot melt material.

  When a fire occurs in the slot of the shelf S (see FIG. 3) and the temperature reaches about 220 ° C., which is the melting point of the solder, the hot melt material made of solder is melted, and the first metal plate 34 and the second metal The adhesion with the metal plate 35 is released, and the door portion 30 to which the first metal plate 34 is attached rotates around the rotation shaft 31-1 of the shaft fitting 31 as indicated by an arrow in FIG. be able to.

  In particular, in this example, as described above, the hot-melt material is not a whole of the lower surface of the convex tip portion 35-2 of the second metal plate 35 having a convex shape in plan view, but a part on the tip side. It is provided only in. Therefore, between the end surface (shown in black in FIG. 5) of the main body portion 35-1 of the second metal plate 35 and the side edge portion of the first metal plate 34. In a state where the predetermined gap is formed, a part of the lower end side of the convex distal end portion 35-2 of the second metal plate 35 and the first metal plate 34 are bonded via the hot melt material. ing.

  As described above, when the temperature is about 220 ° C. or higher, which is the melting point of the solder, the heat melting material made of solder is melted, that is, the thermal fuse 33 operates by detecting heat generation. It depends on the bonding area of the solder material. A gap is provided between the end face (shown in black in FIG. 5) of the main body 35-1 of the second metal plate 35 and the side edge of the first metal plate 34. First, the hot melt material is formed on the entire lower surface of the convex tip portion 35-2 of the second metal plate 35, and the entire lower surface of the convex tip portion 35-2 of the second metal plate 35 and the first metal plate 35. When the metal plate 34 is bonded, the end surface (shown in black in FIG. 5) of the main body 35-1 of the second metal plate 35 on the side of the convex tip 35-2 is also made of solder. Will stick. As a result, the bonding area of the solder is different from that which has been set, which may affect the operating temperature of the thermal fuse 33.

  On the other hand, as in this example, the end surface (shown in black in FIG. 5) of the main body portion 35-1 of the second metal plate 35 and the side edges of the first metal plate 34. In a state where a predetermined gap is formed between the first metal plate 34 and the first metal plate 34, a part of the lower end of the convex tip portion 35-2 of the second metal plate 35 is interposed via a hot melt material. Can be accurately managed so as to maintain the solder bonding area at a predetermined value, and the operating temperature of the thermal fuse 33 can be stabilized.

  Here, the weight of the door part 30 which rotates is demonstrated with reference to FIG.2 and FIG.7.

  As described above, as indicated by the black arrows in FIG. 2, the air taken in from the outside by the fan 27 flows from the bottom to the top inside the electronic device 15, and is indicated by the white arrows in FIG. As described above, the direction is bent by the inner surface of the top plate 26, and the air is discharged to the outside through the exhaust port 25 provided in the upper part of the back surface of the electronic device 15.

  Therefore, when the operating temperature of the thermal fuse 33 reaches the operating temperature of the thermal fuse 33, the rotating door 30 starts to rotate against the wind pressure of the air flowing from the bottom to the top inside the electronic device 15. It is necessary to have a weight that can be

  More specifically, as shown in FIG. 7, when the weight of the door 30 is m, the gravitational acceleration is g, the wind pressure of the air taken in from the outside by the fan 27 is p, and the area of the door 30 is S. The weight m of the door portion 30 needs to satisfy the relationship of m × g × cos θ> p × S × cos θ, that is, m × g> p × S. Here, θ is an inclination angle of the inclined portion 26-2 of the top plate 26 with respect to the horizontal plane.

  In other words, the door part 30 needs to have a weight of a value larger than the value calculated from the air pressure p of the air × the area S of the door part 30 on which the wind pressure p acts ÷ the gravity acceleration g. As a result, when the operating temperature of the thermal fuse 33 is reached, the door portion 30 can start to turn against the wind pressure of the air that has circulated from the bottom to the top inside the electronic device 15.

[Operation of electronic device]
Next, the operation of the electronic device 15 having the above structure will be described.

  First, the case of a normal state where no fire has occurred inside the electronic device 15 will be described, and then the case where a fire has occurred inside the electronic device 15 will be described.

[In normal state]
Reference is again made to FIGS. 2 and 7.

  In a normal state in which no fire has occurred inside the electronic device 15, a cooling structure is ensured by a series of air flows, that is, intake by the fan 27 and exhaust through the exhaust port 25. That is, as indicated by black arrows in FIG. 2, the air taken in from the outside by the fan 27 to cool the electronic components of the plug-in unit provided in the slot in the shelf S is inside the electronic device 15. As shown by the white arrow in FIG. 7, the direction is bent by the inner surface of the top plate 26 and passes through an exhaust port 25 provided in the upper part of the back surface of the electronic device 15. And discharged to the outside.

  In this state, the door portion 30 is fixed to the top plate 26 via the temperature fuse 33 and the hinge 31. As described above, the thermal fuse 33 is formed by bonding the first metal plate 34 and the second metal plate 35 with the hot melt material. The first metal plate 34 is joined to the door portion 30, and the second metal plate 35 is joined to the inclined portion 26 of the top plate 26. Accordingly, the hot melt material that bonds the first metal plate 34 and the second metal plate 35 is pulled by the gravity of the door 30 and the first metal plate 34.

  Further, as described above, the air that has flowed from the bottom to the top inside the electronic device 15 is bent in the flow direction by the inner surface of the top plate 26 that is provided obliquely with respect to the horizontal plane, and thus the electronic device 15. The door portion 30 fixed to the top plate 26 via the temperature fuse 33 and the hinge 31 has a structure that is exhausted to the outside through the exhaust port 25 provided on the upper surface of the Pressure (wind pressure) acts upward, that is, in a direction opposite to the direction of gravity of the door 30 and the first metal plate 34.

  Thus, since the gravity and wind pressure of the door part 30 and the first metal plate 34 act in opposite directions, the pulling force acting on the hot-melt material becomes the gravity- (minus) wind pressure, and the door This is smaller than when only the weights of the portion 30 and the first metal plate 34 act. Therefore, a material having a low tensile strength can be selected as the hot melt material for bonding the first metal plate 34 and the second metal plate 35.

[When a fire occurs inside the electronic device 15]
In the shelf S of the electronic device 15, when a fire occurs in a certain slot, the door portion 30 located immediately above the slot is taken in from the outside by the weight of the door portion 30 and the first metal plate 34 and the fan 27. Using the wind pressure of the air, it rotates as described below.

  That is, when a fire occurs in a slot and the temperature in the slot rises to about 220 ° C. or higher, which is the melting point of the solder, the first metal attached to the door portion 30 located immediately above the slot. The hot-melt material made of solder for bonding the plate 34 and the second metal plate 35 is melted, and the bonding between the first metal plate 34 and the second metal plate 35 is released.

  Then, the door portion 30 to which the first metal plate 34 is attached subtracts the wind pressure from the gravity of the door portion 30 and the first metal plate 34 (the gravity of the door portion 30 and the first metal plate 34 − ( As shown by the arrow in FIG. 6, the rotating shaft 31-1 of the shaft bracket 31 is moved by the minus) wind pressure) force, that is, the wind pressure of the air flowing from the bottom to the top inside the electronic device 15. Begins to pivot to the center.

  FIG. 8 shows a state in which the door part 30 starts to rotate.

  As shown in FIG. 8, at the height portion where the exhaust port 25 of the electronic device 15 is located, the air circulated from the bottom to the top inside the electronic device 15 is provided on the top plate provided obliquely with respect to the horizontal plane. The flow direction is bent by the inner surface of 26 and flows in an obliquely upward direction from the front side to the back side of the electronic device 15.

  Therefore, when the door portion 30 starts to rotate, the direction of action of the wind pressure on the door portion 30 that has been acting in the direction opposite to the gravity of the door portion 30 and the first metal plate 34 before the rotation changes, The wind pressure acts in the direction in which the door 30 is further rotated.

  Therefore, the door part 30 can be rotated using this wind pressure, and the exhaust port 25 can be closed by the door part 30 in a short time. Thereby, even if a fire occurs inside the electronic device 10, the spread of fire to the outside can be instantaneously suppressed.

  Thus, when the door part 30 rotates and the door part 30 is located in the direction perpendicular | vertical to a horizontal surface, the door part 30 contact | abuts to the stopper 32 provided in the lower part of the exhaust port 25. FIG. This state is shown in FIG.

  As shown in FIG. 9, wind pressure is acting on the door 30 in the direction in which the door 30 is pushed out to the back side of the electronic device 15 (the direction indicated by the arrow in FIG. 9), while the stopper 32 is perpendicular to the horizontal plane. In such a direction, the rotation of the door 30 is stopped. Therefore, it can avoid that the door part 30 rotates further to the back side of the electronic apparatus 15 rather than the direction perpendicular | vertical to a horizontal surface, and once the door part 30 closes the exhaust port 25, the door part 30 will not flutter. The closed state can be maintained.

  By the way, the inventor of the present invention inserts a gas burner below the slot of the shelf S of the electronic device 15 according to the first embodiment of the present invention based on the standard GR-63-CORE to burn methane gas. The simulation shown in FIG. 10 to FIG. 12 is obtained. Here, FIG. 10 to FIG. 12 are front views (No. 1) to (No. 3) of the electronic device 15 showing simulation results of the fire test of the electronic device 15 according to the first embodiment of the present invention. 10 to 12, the temperature distribution in the shelf S is shown.

  In the example shown in FIG. 10, the width of the door portion 30 located above each slot is set to about 65 mm, that is, the hot melt material provided in each door portion 30 is provided at intervals of about 65 mm, A simulation result is shown in the case where a gas burner is inserted below the central slot and methane gas is burned to generate about 9 kW of heat.

  The hot melt material provided in the thermal fuse 33 located above the slot in which the gas burner is inserted melts, and the door 30 provided with the thermal fuse 33 partially closes the exhaust port 25. Therefore, it is possible to prevent the flame from blowing out to the outside of the electronic device, and to spread the fire to the outside of the electronic device 10.

  Further, although the temperature in the shelf S rises due to combustion of methane gas, a metal partition plate 24 (see FIG. 2) is provided up to a height at which the upper end of the printed wiring board of the plug-in unit inserted into the slot of the shelf S is located. Therefore, the fire spread to the plug-in unit inserted into the slot adjacent to the slot into which the gas burner is inserted is avoided.

  On the other hand, the partition plate 24 (see FIG. 2) is not provided at the location where the exhaust port 25 is located, and the partition with the adjacent slot is not formed at the location, so high temperature heat, smoke, and The flammable gas spreads in the lateral direction at the location, and is discharged to the outside of the electronic device 15 through the open portion of the exhaust port 25.

  According to the result of the simulation, a range extending about 80 mm to the left and right centering on the slot of the heat source has a temperature equal to or higher than the melting point (about 220 ° C.) of the solder constituting the hot melt material. From this, among the bonding materials (solder) provided at intervals of about 65 mm, it is possible to melt the hot-melt material located at the position closest to the heat source.

  In addition, in the part surrounded by the dotted line in FIG. 10, the temperature rise is hardly seen. This is because high-temperature heat and smoke spread in the lateral direction at the height where the exhaust port 25 is provided, and is discharged to the outside of the electronic device 15 through the open portion of the exhaust port 25. Because.

  In the example shown in FIG. 10, it is assumed that a gas burner is inserted below the slot in the substantially center of the shelf S to burn methane gas, and a heat amount of about 9 kW is generated. However, the slot of the heat source is changed. Example simulation results are shown in FIGS.

  In the example shown in FIG. 11, the case where the slot of the heat source is located on the left side of the example shown in FIG. 10 is shown. In the example shown in FIG. 12, the slot of the heat source is shown in FIG. The case where it is located on the right side of the example is shown.

  Also in the example shown in FIGS. 11 and 12, similarly to the example shown in FIG. 10, the thermal melting material provided in the thermal fuse 33 located above the slot in which the gas burner is inserted melts, and the thermal fuse 33 The door part 30 provided with a partly closes the exhaust port 25. Therefore, it is possible to prevent the flame from blowing out to the outside of the electronic device, and to spread the fire to the outside of the electronic device 10. Further, high-temperature heat, smoke, and flammable gas are discharged to the outside of the electronic device 15 through the opened portion of the exhaust port 25.

  Incidentally, as described above, in the example illustrated in FIG. 3, the eight door portions 30 are provided, but the closing operation of the other door portion 80 adjacent to the one door portion 80 that closes the exhaust port 25 is performed. Will be described with reference to FIGS. 13 and 14. FIG.

  Here, FIG. 13 and FIG. 14 are diagrams for explaining the closing operation of the other door portion 80 adjacent to the one door portion 80 that closes the exhaust port 25, and FIG. It is a back surface part expansion perspective view when the electronic device concerning a 1st embodiment is seen from the bottom. In FIGS. 13 and 14, the door portion 30 is illustrated as door portions 30-1 to 30-8 for ease of explanation.

  Referring to FIG. 13, a fire occurs in a slot located below the door portion 30-5, the temperature rises, and the hot melt material provided in the thermal fuse 33 provided in the door portion 30-5. When the melting point is reached, the door portion 30-5 partially closes the exhaust port 25.

  Then, as shown by black arrows in FIG. 13, the flame, high-temperature air, smoke, and flammable gas are prevented from flowing by the door portion 30-5 and wrap around the door portion 30-5 in the lateral direction. It spreads and tries to come out of the electronic device 15 through the open part of the exhaust port 25. At this time, the door portion 30-4 adjacent to the door portion 30-5 and the thermal fuse 33 provided in the door portion 30-6 are activated when the operating temperature is reached. Therefore, as shown in FIG. 4 and the door portion 30-6 also partially close the exhaust port 25.

  Nonetheless, flame, hot air, smoke, and flammable gas are blocked from flowing by the door portions 30-4 to 30-6, wrap around the door portions 30-4 to 30-6, and spread in the lateral direction. Even if it tries to go outside the electronic device 15 through the open portion of the mouth 25, the door portion 30-3 adjacent to the door portion 30-4 and the door portion 30-7 adjacent to the door portion 30-6. When the operating temperature reaches the operating temperature, the door portion 30-3 and the door portion 30-7 also partially close the exhaust port 25.

  Thus, in this example, it has the structure where the door parts 30-1 thru | or 30-8 close the exhaust port 25 in order. Therefore, it is possible to reliably prevent the flame from blowing out to the outside of the electronic device 15, and to avoid the spread of fire to the outside of the electronic device 10. Further, high-temperature heat, smoke, and flammable gas can be discharged to the outside of the electronic device 15 through the opened portion of the exhaust port 25.

  When a fire occurs in an arbitrary slot, the thermal fuse 33 provided in the door portion 30 located immediately above the slot is activated, and the exhaust port 25 immediately above the ignition point is closed by the door portion 30. As long as other door parts 30 adjacent to each other can be closed in order according to the state at that time, the number of door parts 30 that close the exhaust port 25 and the temperature fuses 33 provided in each door part 30 are arranged. There is no particular limitation on the position.

  In this way, by providing a plurality of door portions 30 so as to divide the exhaust ports 25 and partially closing (dividing) the exhaust ports 25 by the respective door portions 30, an arbitrary inside of the electronic device 15 is provided. Even if a fire occurs at the location, the exhaust port 25 can be partially closed by the appropriate door portion 30, and the fire spread to the outside of the electronic device 15 can be prevented. On the other hand, high-temperature heat, smoke, and flammable gas can be discharged to the outside of the electronic device 15 from the open portion of the exhaust port 25. Therefore, it is possible to avoid the high temperature heat, smoke, and flammable gas from filling the inside of the electronic device 15, and to prevent the flame from leaking from the front gap of the electronic device 15. Can do.

  As described above, according to the electronic device 15 according to the first embodiment of the present invention, the exhaust port 25 is opened in a normal state where no fire has occurred inside the electronic device 15, By closing the exhaust port 25 only when a fire occurs inside the electronic device 15, it is possible to prevent the electronic device 15 from spreading to the outside. Moreover, since the exhaust port 25 is closed only when a fire occurs inside the electronic device 15, the cooling performance of the electronic device 15 can be improved.

  In particular, in the electronic device 15 according to the first embodiment of the present invention, the exhaust port 25 is provided with a plurality of door portions 30, and the door portion 30 closes the exhaust port 25 in a divided manner. It has become.

  Therefore, when a fire occurs at an arbitrary location inside the electronic device 15, the thermal fuse 33 provided in the door portion 30 located immediately above the fire occurrence location is activated, so that the door portion 30 is It is possible to prevent the flame from coming out of the electronic device 15 by closing, and to prevent the electronic device 15 from spreading to the outside. Moreover, since the door part 30 adjacent to the door part 30 which closed the exhaust port 25 can also be closed in order, it can prevent reliably that a flame blows out of the electronic device 15.

  On the other hand, the door 30 where the temperature fuse 33 has not reached the operating temperature is left open without closing the exhaust port 25, and flammable gas generated by combustion, high-temperature heat and smoke are removed from the electronic device 15. It can be discharged to the outside and further combustion can be suppressed. Therefore, the self-extinguishing function of the electronic device 15 can be improved.

  In general, as a component provided in an electronic device such as the electronic device 15 according to the first embodiment of the present invention, a flame retardant having a high oxygen concentration (oxygen index) necessary for continuously burning the material. Material is used. This oxygen concentration increases as the temperature of the air decreases. Accordingly, the electronic device 15 cooling structure according to the first embodiment of the present invention releases heat with high cooling performance to lower the temperature of the air inside the electronic device 15, thereby allowing the electronic device 15 to self-extinguish. Can be improved.

  By the way, a stopper 32 is provided as a door part rotation stop member at the lower part of the exhaust port 25 so that the rotation of the door part 30 is stopped in a direction perpendicular to the horizontal plane. In the example shown in FIG. The stopper 32 has a shape in which a U-shape is rotated 90 degrees counterclockwise when viewed from the back side of the electronic device 15, that is, a side surface of the electronic device 15 (surfaces on the Y1 and Y2 sides in FIG. 3). A predetermined length is formed in the vertical direction (Z1-Z2 direction) at two nearby locations, and the electronic device 15 is bent in the width direction (Y1-Y2 direction).

  However, the present invention is not limited to such a mode, and the shape and mounting mode of the stopper are not particularly limited. For example, the structure shown in FIGS. 15 and 16 may be used. Here, FIGS. 15 and 16 are rear perspective views (No. 1) and (No. 2) when the electronic device 100 according to a modification of the electronic device shown in FIG. 3 is viewed from below. 15 and FIG. 16, the same parts as those shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 15 shows a state in which none of the door portions 30 closes the exhaust port 25, that is, a normal state in which no fire has occurred inside the electronic device 15.

  In the example shown in FIG. 15, the door rotation stop plate 110 formed with the same number of openings 115 having a predetermined size as the number of the doors 30 (eight in the example shown in FIG. 15) is the door. The door part 30 is attached to the entire surface of the exhaust port 25 as a door part rotation stop member that stops the rotation of the door part 30 by contact with the part 30.

  FIG. 16A shows a state in which all the door portions 30 are brought into contact with the door portion rotation stop plate 110 and the exhaust port 25 is closed, and FIG. In (a), the part surrounded by a dotted line is shown enlarged. 16A and 16B, the alternate long and short dash line indicates the outer shape of the door portion 30 that is in contact with the door portion rotation stop plate 110.

  Eight openings 115 are formed in the door rotation stop plate 110. Adjacent openings 115 are provided with an interval of length A. On the other hand, in order to rotate each door part 30, it is necessary to provide a slight gap (a gap of length B in this example) between the adjacent door parts 30.

  In this example, the length A between the adjacent openings 115 is set longer than the length B of the gap between the adjacent doors 30. Further, in this example, when the exhaust port 25 is closed by the door portions 30 adjacent to each other, the vertical portion of the outer periphery of the door portion 30 is positioned between the adjacent opening portions 115 of the door portion rotation stop plate 110. .

  Therefore, when the exhaust port 25 is closed by the door portions 30 adjacent to each other, a gap between the adjacent door portions 30 is located at a location where the opening portion 115 is not formed in the door portion rotation stop plate 110, and the adjacent door portions 30 are adjacent to each other. The gap between the door portions 30 can be closed at a location where the opening portion 115 is not formed in the door portion rotation stop plate 110. Therefore, it is possible to prevent the flame from leaking from the gap between the adjacent door portions 30 in the event of a fire, and to reliably spread the fire to the outside of the electronic device 100.

  Further, in the above-described embodiment, a plurality (three in the example shown in FIG. 2) of electronic devices 15 are mounted in a plurality of stages (three in the example shown in FIG. 2) in a superimposed manner in the cabinet 16. In each electronic device 15, a top plate 26 is provided obliquely with respect to the horizontal plane, and an exhaust port 25 of each electronic device 15 is formed in an upper part on the back surface (surface on the X2 side in FIG. 3) of the electronic device 15. .

  However, the present invention is not limited to such an embodiment. The electronic device of the present invention does not necessarily have to be mounted in a plurality of stages in a superimposed manner in the cabinet, and there is no particular restriction on the direction in which the top plate is disposed. Furthermore, the exhaust port of the electronic device may not necessarily be formed on the back surface of the electronic device, and may be formed on the front surface of the electronic device.

  In the above-described embodiment, the electronic device 15 includes the shelf S into which a plurality of plug-in units are inserted in a state where the main surface of the printed wiring board is positioned in a direction perpendicular to the horizontal plane.

  However, the present invention is not limited to such an embodiment. For example, for an electronic device having a structure in which multiple plug-in units are inserted with the main surface of the printed wiring board positioned in a direction parallel to the horizontal plane, and intake air from the front and exhaust air from the back However, the present invention can be applied.

2. Second Embodiment of the Present Invention Next, a second embodiment of the present invention will be described. The electronic device according to the second embodiment of the present invention is different from the electronic device 15 according to the first embodiment of the present invention in that the door closing structure and mechanism at the exhaust port are different from each other. It has the same structure as the electronic device 15 according to the first embodiment of the present invention.

  Therefore, in the following, with regard to the structure of the electronic device according to the second embodiment of the present invention, the door closing structure at the exhaust port will be mainly described, and then the operation of the electronic device will be described. 17 to 32, the same portions as those shown in FIGS. 3 to 16 are denoted by the same reference numerals, and the description thereof is omitted.

[Structure of electronic device]
FIG. 17 is a rear perspective view of the electronic device according to the second embodiment of the present invention when viewed from below.

  Referring to FIG. 17, an IC (Integrated Circuit) or an LSI (LSI) is provided in the shelf S provided on the front surface (X1 side surface in FIG. 17) of the electronic device 215 according to the second embodiment of the present invention. A plurality of the plug-in units in which electronic components such as a large scale integration circuit) are mounted on a printed wiring board are inserted in the X2 direction in FIG. 17 with the main surface of the printed wiring board positioned in a direction perpendicular to the ground. The

  In the shelf S, a metal partition plate (not shown in FIG. 17) is provided in the same manner as in the embodiment shown in FIG. Thereby, when the electronic component of the plug-in unit or the printed wiring board burns due to a fire or the like, it is possible to prevent the flame from moving to the adjacent plug-in unit.

  Such a metal partition plate is provided up to a height at which the upper end of the printed wiring board of the plug-in unit is located, but an exhaust port formed in an upper part on the back surface (surface on the X2 side in FIG. 17) of the electronic device 215. It is not provided at the location where the 225 is located, and the partition with the adjacent slot is not provided at the location.

  The exhaust port 225 formed in the upper part of the back surface of the electronic device 215 (the surface on the X2 side in FIG. 17) is closed by the rotation of a door portion 230, which will be described in detail later. In the example shown in FIG. 17, three door portions 230 (230A to 230C) are provided.

  At the upper end of the electronic device 215, as shown by the dotted line in FIG. 17, the top plate 26 is provided obliquely with respect to the horizontal plane (XY plane). Thus, the upper end of the electronic device 215 is positioned so that the back side (X2 side in FIG. 17) is higher than the front side (X1 side in FIG. 17), and the exhaust port is located above the back side (surface on the X2 side in FIG. 17). An opening 225 is formed.

  Further, since the internal temperature of the electronic device 215 rises due to heat generated by the electronic components and the like, a forced air-cooling type cooling unit similar to the fan 27 shown in FIG. 2 is used to maintain the internal temperature at a desired temperature. A plurality of fans (not shown in FIG. 17) are provided at the lowermost part of the electronic device 215. That is, in the electronic device 215 of this example, an air inlet is formed at the lowermost portion of the device.

  With such a fan, air is forcibly taken in (intake) from the outside in the Z1 direction of FIG. 17, and is circulated from the bottom to the top inside the electronic device 215 to cool the heat-generating electronic components and the like. The warmed air is bent in the direction of the inner surface of the top plate 26 provided obliquely at the upper end of the electronic device 215, and is provided on the upper surface of the back surface (the surface on the X2 side in FIG. 17) of the electronic device 215. Then, it is discharged (exhausted) to the outside through the exhaust port 225. The fan is set not to stop even if a fire occurs in the slot of the shelf S.

  Note that the electronic apparatus is formed by attaching the electronic device 215 in a plurality of stages in a superimposed manner, as with the electronic device 15 according to the first embodiment of the present invention (see FIG. 2).

  Here, the closing structure of the door 230 at the exhaust port 225 of the electronic device 215 will be described with reference to FIGS.

  First, referring to FIG. FIG. 18 is an exploded perspective view for explaining the structure of the exhaust port 225 of the electronic device 215 shown in FIG.

  As shown in FIG. 18, the upper portion of the electronic device 215 includes a top plate 26 provided obliquely at the upper end of the electronic device 215, and a door portion provided so as to be rotatable with respect to the top plate 26 via a hinge 201. 230A to 230C, three openings 205A to 205C corresponding to the doors 230A to 230C, the door rotation stop plate 210 attached to the entire surface of the exhaust port 225, the door 230B and the door 230A and 230C, a part of the two door part partition plates 220 attached to the top plate 26 and a part of the door part partition plate 220 and the electronic device 215 in the vicinity of the upper side surface. Is generally composed of a leaf spring 250 attached to the top plate 26 and a rope 255 stretched between the pair of leaf springs 250 in the openings 205A to 205C.

  Here, the door portions 230A to 230C will be described with reference to FIG. FIG. 19 is a perspective view of the exhaust port 225 of the electronic device 215 shown in FIG. 17 as viewed from below.

  As shown in FIG. 19, three door portions 230 </ b> A to 230 </ b> C are provided in the exhaust port 225 of the electronic device 215. The area of the door part 230B located substantially in the center of the exhaust port 225 is set larger than the door parts 230A and 230C located on the left and right sides thereof.

  Although details will be described later, when the electronic device 215 is in a normal state, the door portions 230A to 230C are located in the vicinity of the top plate 26 and are supported by the leaf spring 250 in contact with the leaf spring 250. Further, in this state, the side end portions of the door portions 230A to 230C are located directly above the partition plate 24 that partitions the slots in the shelf S.

  The door portions 230A to 230C are connected to the top plate 26 via a hinge 201. When the door portions 230A to 230C are rotated by their own weight with respect to the top plate 26, the exhaust port 225 is closed. Although details will be described later, when a fire occurs inside the electronic device 215, at least one door portion of the door portions 230A to 230C is closed, and at least one door portion is not closed. Therefore, at least a part of the exhaust port 225 is always open.

  When the door portions 230A to 230C rotate by their own weight and come into contact with the door portion rotation stop plate 210, the rotation of the door portions 230A to 230C is stopped. Then, by the above-mentioned fan, the air outlet 225 is forced to be taken in from the outside in the Z1 direction of FIG. The closed state is maintained.

  In this example, as described above, the door portion rotation stop plate 210 has three openings 205A to 205C.

  FIG. 20 is an enlarged view of a portion surrounded by a dotted line in FIG.

  Adjacent openings 205A and 205B are provided with an interval of length A. On the other hand, a slight gap (a gap of length B in this example) is provided between the adjacent door portions 230A and 230B so that the door portions 230A and 230B can rotate.

  In this example, the length A between the adjacent openings 205A and 205B is set longer than the length B of the gap between the adjacent doors 230A and 230B. Further, in this example, when the exhaust port 225 is closed by the door portions 230A and 230B adjacent to each other, the vertical direction of the outer periphery of the door portions 230A and 230B is between the adjacent opening portions 215 of the door portion rotation stop plate 210. The part is located. This dimensional relationship is the same in the adjacent openings 205B and 205C.

  Therefore, when the exhaust port 225 is closed by the door portions 230 adjacent to each other, a gap between the adjacent door portions 230 is located at a position where the opening portion 215 is not formed in the door portion rotation stop plate 210, and the adjacent door portions 230 are adjacent to each other. The gap between the door portions 230 can be closed at a location where the opening portion 215 is not formed in the door portion rotation stop plate 210. Therefore, it is also possible to avoid a flame leaking from the gap between the adjacent door portions 230 in the event of a fire, and to reliably spread the fire to the outside of the electronic device 215.

  Referring to FIG. 19 again, a door partition plate 220 is provided between the door 230B and the doors 230A and 230C, and the exhaust port 225 has three areas, that is, the door 230A. Are divided into a region where the door portion 230B is provided, and a region where the door portion 250C is provided.

  FIG. 21 shows a top view of the electronic device 215 with the top plate 26 (see FIG. 17) removed. The upper side of the paper surface of FIG. 21 is the back side of the electronic device 215.

  As shown in FIGS. 19 and 21, the door partition plate 220 includes a main body 220a having a main surface formed in the vertical direction, and a mounting portion 220b formed to bend and extend from the main body 220a by a predetermined angle. And is composed of. The attachment portion 220b is attached and fixed to the top plate 26 by a fastening member such as a screw.

  In FIG. 22, the area | region in which the door part 230B was provided among the exhaust ports 225 shown in FIG. 19 is expanded and shown.

  As shown in FIGS. 21 and 22, the exhaust port 225 is partitioned by the door partition plate 220 on the back side of the electronic device 215, but the front side of the electronic device 215 is partitioned in the same manner as the back side. Not in. That is, a region where the door partition plate 220 is not provided is formed on the front side of the electronic device 215.

  Therefore, as will be described in detail later, when a fire occurs inside the electronic device 215, the flame can wrap around the front side of the electronic device 215 in which a region where the door partition plate 220 is not provided is formed. It has a structure.

  And as shown in FIG. 21, the main-body part 220a of the door part partition plate 220 is located right above the partition plate 24 which partitions between the slots. Also, the end of the main body 220a on the front side of the electronic device 215 is located on the front side of the electronic device 215 with respect to the rope 255 stretched between the pair of leaf springs 250 in the openings 205A to 205C. is doing. The operation of this structure will be described later.

  Next, a leaf spring 250 provided in the vicinity of the inner partition of the upper part of the door partition plate 220 and the electronic device 215 and a part of the leaf spring 250 is attached to the top plate 26, and provided in a region in each of the openings 205A to 205C. The structure of the rope 255 stretched between the pair of leaf springs 250 will be described.

  FIG. 23 is a perspective view of an area where the door 230B shown in FIG. 22 is provided as viewed from below. In FIG. 23, the region where the door portion 230B is provided is mainly illustrated, but a similar structure is also formed in the region where the door portions 230A and 230C are provided.

  As shown in FIGS. 21 and 23, the leaf spring 250, which is an elastic member, is bent at a predetermined angle from the main body 250a having a main surface formed in the vertical direction and the main body 250a on the front side of the electronic device 215. A top mounting portion 250b that extends and a rope mounting portion 250c that extends from the main body portion 250a to the inside of the door portions 230A to 205C by bending about 90 degrees on the back side of the electronic device 215. It is roughly composed of

  The interval between the pair of leaf springs 250 provided in the openings 205A to 205C is set longer than the width of the doors 230A and 230C. The main body portions 250a of the pair of leaf springs 250 are provided so as to be substantially in contact with, for example, the main body portion 220a of the door partition plate 220 before the rope 255 is attached.

  The top plate mounting portion 250b is fixedly attached to the top plate 26 by a fastening member such as a screw. However, the top plate mounting portion 250b may not be provided, and the end portion of the main body portion 250a of the leaf spring 250 on the front side of the electronic device 215 may be fixed to the main body portion 220a of the door partition plate 220. .

  Both ends of the rope 255 are attached to the rope attachment portion 250c of the pair of leaf springs 250, and the rope 255 is stretched in the width direction of the door portions 230A to 230C.

  The rope 255 is a thread-like or linear thin and long member (for example, a wire or the like) that can be melted by heat at a predetermined temperature. The length of the rope 255 is shorter than the distance between the rope attachment portions 250c of the pair of leaf springs 250. When both ends of the rope 255 are attached to the pair of attachment portions 250c, the body portion 250a of the leaf spring 250 and the rope The attachment portion 250c is pulled by the rope 255 and is elastically bent (elastically deformed) inside the door portions 230A to 230C.

  The distance between the front end portions of the body portion 250a of the pair of elastically bent leaf springs 250 on the back side of the electronic device 215 is shorter than the width of the door portions 230A to 230C. Therefore, the front end portion of the main body portion 250a of the leaf spring 250 on the back side of the electronic device 215 is located directly below the door portions 230A to 230C that are about to rotate by its own weight with respect to the top plate 26 via the hinge 201. . Therefore, the door portions 230A to 230C are supported by the tip portion, and thereby the door portions 230A to 230C are held open.

  That is, when the electronic device 215 is in a normal state, the door portions 230A to 230C are located between the top plate 26 and the front end portion of the main body portion 250a of the leaf spring 250 on the back side of the electronic device 215.

  When the electronic device 215 is in a normal state, the air in the electronic device 215 is warmed by the heat generated by the electronic components provided in the electronic device 215, and the temperature of the air at the exhaust port 225 of the electronic device 215 is about 80, for example. Rise to ℃. In addition, since the rope 255 is always pulled by the restoring force of the leaf spring 250 to which both ends are attached, a creep phenomenon in which the deformation of the rope 255 proceeds with time can occur due to the pull.

  Therefore, the extension amount of the rope 255 due to heat or the creep causes the leaf spring 250 to shift to the outside of the door portions 230A and 230C due to the elongation, and the support of the door portions 230A and 230C by the leaf spring 250 is released. The elastic force of the leaf spring 250, the length of the rope 255, the material, and the like are set so as not to reach the length at which 230A and 230C close.

  In selecting the material of the rope 255, although it is melted by heat and not cut when the temperature of the air at the exhaust port 225 when the electronic device 215 is in a normal state (for example, about 80 degrees), the exhaust port It is also considered that the air can be melted with heat when the temperature of the air at 225 reaches a predetermined temperature higher than the temperature.

  On the other hand, when a fire occurs inside the electronic device 215, the door portions 230A to 230C rotate as shown in FIGS. Here, FIGS. 24 to 26 are views (No. 1) to (No. 3) for explaining the rotation operation of the door portions 230A to 230C when a fire occurs inside the electronic device 215. FIG. In FIG. 24 to FIG. 26, for the convenience of explanation, only the rotation operation of the door portion 230B is shown, but this also applies to the door portions 230A and 230C.

  When the rope 255 is cut by burning or melting of the rope 255 due to flame (see FIG. 24) or the rope 255 is stretched by heat, the leaf spring 250 is restored, and the plate as shown by the arrow in FIG. The spring 250 shifts to the outside of the door part 230B, and the support of the door part 230B by the leaf spring 250 is released. If it does so, as shown in FIG. 25, the door part 230B will rotate through the hinge 201 with dead weight.

  When the door 230B comes into contact with the door rotation stop plate 210 by the rotation, the rotation of the door 230B is stopped as shown in FIG.

  Then, the exhaust port 225 is closed by the door portion 230B by the wind pressure of the air that is forcibly taken in from the outside in the Z1 direction of FIG. 17 by the above-described fan and flows from the bottom to the top inside the electronic device 215. Is maintained.

  The operation of the electronic device 215 having such a structure for closing the door 230 at the exhaust port 225 will be described below.

[Operation of electronic device]
As described above, when the electronic device 215 is in the normal state, the front end portion of the main body portion 250a of the leaf spring 250 on the back side of the electronic device 215 is rotated by its own weight with respect to the top plate 26 via the hinge 201. It is located directly under the doors 230A to 230C to be moved (see FIGS. 21 and 23). Therefore, the door portions 230A to 230C are supported by the tip portion, and thereby the door portions 230A to 230C are held open.

  When a fire occurs inside the electronic device 215, the doors 230A to 230C operate as follows depending on the location of the fire.

1. When the Fire Occurrence Location is Near the Center of the Electronic Device 215 FIG. 27 is a diagram for explaining the operation of the door portions 230A to 230C when a fire occurs near the center of the electronic device 215.

  A fire occurred inside the electronic device 215 and below the door 230B near the center of the electronic device 215 (the location where the fire occurred is indicated by a cross in FIG. 27), and the flame is roped. When the height reaches the position, the rope 255 stretched in the region where the door portion 230B is located is cut by combustion or melting due to a flame, etc., the leaf spring 250 is restored, and the door portion 230B is It rotates through the hinge 201 by its own weight, and the region where the door 230B is located at the exhaust port 255 is closed.

  On the other hand, as described with reference to FIGS. 21 and 22, the exhaust port 225 is partitioned by the door partition plate 220 on the back side of the electronic device 215, but the front side of the electronic device 215 is the back side. Similarly, it is not partitioned. That is, a region where the door partition plate 220 is not provided is formed on the front side of the electronic device 215 (see FIGS. 21 and 22).

  Therefore, the air flow that is forcibly taken in from the outside in the Z1 direction of FIG. 17 by the fan and flows from the bottom to the top inside the electronic device 215 wraps around the door partition plate 220 to form the door portion. The flow is exhausted from the left and right regions of the region where 230B is provided. The front side of the electronic device 215 in which the area where the door partition plate 220 is not provided is formed as shown by the black arrows in FIG. Go around.

  However, as shown in FIG. 19, the area of the door part 230 </ b> B located substantially at the center of the exhaust port 225 is set larger than the door parts 230 </ b> A and 230 </ b> C located on the left and right sides thereof.

  Therefore, the flame does not reach the rope 255 stretched in the region where the door portions 230A and 230C located on the left and right of the door portion 230B are located, and the rope 255 is not cut. Therefore, the region where the door portion 230A and the door portion C are located in the exhaust port 255 is not closed.

  As described above, when the fire is generated near the center of the electronic device 215, the door 230B located at the approximate center of the exhaust port 225 is closed, so that it is possible to prevent the electronic device 215 from spreading to the outside. .

  Moreover, although a flame wraps around the front side of the electronic apparatus 215, since the door part 230A and the door part 230C are not closed, the exhaust port 255 is maintained in a partly open state. And from the said opening part, the flammable gas which generate | occur | produces by combustion, high temperature heat | fever, and smoke can be discharged | emitted outside the electronic device 215, and further combustion can be suppressed. Therefore, the self-extinguishing function of the electronic device 215 can be improved.

2. FIG. 28 and FIG. 29 show the door portion 230A when a fire occurs near the door partition plate 220 located between the door portion 230B and the door portion 230C. 4A to 2C are diagrams (part 1) and (part 2) for explaining the operation of 230C.

  A fire occurs in the vicinity of the door partition plate 220 located inside the electronic device 215 and below the door portion 230B and between the door portion 230B and the door portion 230C (the location where the fire occurred) When the flame reaches the height at which the rope is positioned, the rope 255 stretched in the region where the door portion 230B is positioned is cut by combustion or melting by the flame. As a result, the leaf spring 250 is restored, the door portion 230B is rotated by its own weight through the hinge 201, and the region where the door portion 230B is located at the exhaust port 255 is closed.

  The air that is forcibly taken in from the outside in the Z1 direction of FIG. 17 by the fan and flows from the bottom to the top inside the electronic device 215 wraps around the door partition plate 220, and the door portion 230B The flow is exhausted from the left and right regions of the provided region. The flame also rides on the air flow, and wraps around the front side of the electronic device 215 in which the region where the door partition plate 220 is not provided is formed (the lower side of the drawing in FIG. 27).

  Therefore, as shown by the black arrow in FIG. 28, the flame is provided with an adjacent region (in the example shown in FIG. 28, the door portion 230C) via the door partition plate 220 located near the location where the fire has occurred. And the flame reaches the rope 255 stretched in the region, and the rope 255 is cut by combustion or melting by the flame, so that the leaf spring 250 is restored, and the door portion 230C is caused by its own weight. It rotates via the hinge 201, and the region where the door portion 230C is located at the exhaust port 255 is closed (see FIG. 28).

  Then, the door part which is not closed becomes only the door part 230A located on the side far from the place where the fire has occurred, and is exhausted therefrom. The flame is directed toward the door portion 230A, but does not reach the rope 255 stretched in the region where the door portion 230A is located, and the rope 255 is not cut. Accordingly, the region where the door portion 230A is located at the exhaust port 255 is not closed (see FIG. 29).

  Thus, when the fire occurrence location is in the vicinity of the door partition plate 220, the door portion 230B located at the approximate center of the exhaust port 225 and the door portion 230C located near the fire occurrence location are closed. Therefore, it is possible to prevent the electronic device 215 from spreading to the outside.

  Further, although the flame wraps around the front side of the electronic device 215, the door portion 230 </ b> A located at a location far from the location where the fire occurs is not closed, so that a part of the exhaust port 255 is maintained open. And from the said opening part, the flammable gas which generate | occur | produces by combustion, high temperature heat | fever, and smoke can be discharged | emitted outside the electronic device 215, and further combustion can be suppressed. Therefore, the self-extinguishing function of the electronic device 215 can be improved.

3. When the location where the fire is generated is an area where the door portion 230A (230C) is provided The inside of the electronic device 215, the location below the door portion 230A or the door portion 230C provided on the left or right side of the door portion 230B When a fire occurs at the point where the flame reaches the height of the rope 255 stretched in the region where the door portion 230A (230C) is located, the rope 255 is cut by combustion or melting by the flame, etc. As a result, the leaf spring 250 is restored, the door portion 230A (230C) is rotated by its own weight through the hinge 201, and the region where the door portion 230A (230C) is located at the exhaust port 255 is closed.

  The air that is forcibly taken in from the outside in the Z1 direction of FIG. 17 by the fan and flows from the bottom to the top inside the electronic device 215 wraps around the door partition plate 220, and the door portion 230B It becomes the flow which exhausts from the area | region provided. The flame also rides on the air flow and turns around to the front side of the electronic device 215 in which the area where the door partition plate 220 is not provided is formed.

  The location where the fire occurred is far from the door partition plate 220 provided between the door portion 230A (230C) and the door portion 230B, and the rope 255 stretched in the region where the door portion 230B is provided. If the flame does not reach, the rope 255 is not cut. Therefore, the region where the door portion 230B is located at the exhaust port 255 is not closed. That is, in this case, only the door portion 230A (230C) is opened.

  On the other hand, the location where the fire occurred is close to the door partition plate 220 provided between the door portion 230A (230C) and the door portion 230B, up to the rope 255 stretched in the region where the door portion 230B is provided. When the flame reaches, the rope 255 is cut by combustion or melting by the flame, and as a result, the leaf spring 250 is restored, the door portion 230B rotates through the hinge 201 due to its own weight, and the door portion 230B is formed at the exhaust port 255. The area where is located is closed.

  Then, the door part which is not closed becomes only the door part 230C (230A) located on the side far from the place where the fire has occurred, and is exhausted therefrom. At this time, the flame is directed toward the door 230C (230A), but does not reach the rope 255 stretched in the region where the door 230C (230A) is located, and the rope 255 is not cut. Therefore, the region where the door portion 230C (230A) is located in the exhaust port 255 is not closed.

  As described above, when the location of the fire is within the region of the door portion 230A (230C) provided on the left side (right side) of the door portion 230B, at least the door portion 230A (230C) is closed, and thus the electronic device 215 is closed. Can be spread to the outside.

  In addition, the flame wraps around the front side of the electronic device 215, but at least the door portion 230 </ b> C (230 </ b> A) located on the far side from the location where the fire occurred is not closed, so that a part of the exhaust port 255 is kept open. The And from the said opening part, the flammable gas which generate | occur | produces by combustion, high temperature heat | fever, and smoke can be discharged | emitted outside the electronic device 215, and further combustion can be suppressed. Therefore, the self-extinguishing function of the electronic device 215 can be improved.

  Thus, according to the second embodiment of the present invention, the rope 255 is stretched longer than the width of the door portions 230A to 230C in the region where the door portions 230A to 230C are provided. Even if a fire occurs in any slot in the area where the doors 230A to 230C are provided, no matter what temperature distribution is formed in the area (even if only a specific part becomes hot) ), The rope 255 is cut by the combustion, melting or elongation of the flame, and as a result, the leaf spring 250 is restored. Then, the door portions 230A to 230C are rotated by the dead weight via the hinge 201, and the region where the door portions 230A to 230C are located in the exhaust port 255 is closed, and it is possible to prevent the electronic device 215 from spreading to the outside. .

  Since a region where the door partition plate 220 is not provided is formed on the front side of the electronic device 215, the electronic device 215 is forcibly taken in from the outside by the fan and moves from the bottom to the top inside the electronic device 215. The flow of the air that circulates in this manner is a flow that goes around the door partition plate 220. The flame also rides on the air flow and turns around to the front side of the electronic device 215 in which the area where the door partition plate 220 is not provided is formed.

  Accordingly, after the one door portion 230A to 230C is formed, the flame wraps around the vicinity of the one door portion 230A to 230C, and the other side door portion 230A to 230C is provided from the back side of the electronic device 215 provided. It is possible to prevent a fire from occurring outside the electronic device 215.

  Further, since the flame wraps around the front side of the electronic device 215 in which the region where the door partition plate 220 is not provided is formed, the length of the flame in the electronic device 215 becomes long. Therefore, since the flame can be interrupted in the electronic device 215, it is possible to prevent the fire from being generated outside the electronic device 215.

  Furthermore, even if the flame is not interrupted in the electronic device 215, the flame is applied to the rope 255 which is located in front of the exhaust port 225 and is provided in the region where the other door portions 230A to 230C are provided. When it reaches, the rope 255 is cut by burning, melting or stretching by the flame, and as a result, the leaf spring 250 is restored. Then, the other door portions 230A to 230C are rotated by the dead weight through the hinge 201, the region where the other door portions 230A to 230C are located in the exhaust port 255 is closed, and the fire spreads to the outside of the electronic device 215. Can be prevented.

  Regardless of where the fire occurs in the electronic device 215, at least one of the door portions 230A to 230C is not closed and a part of the exhaust port 225 is always open. Therefore, flammable gas, high-temperature heat and smoke generated by combustion can be discharged from the electronic device 215 from the portion opened at the exhaust port 225, and further combustion can be suppressed. Therefore, the self-extinguishing function of the electronic device 215 can be improved.

  That is, according to the second embodiment of the present invention, when a fire occurs in the electronic device 215, the three door portions 230 </ b> A to 230 </ b> C are opened with the locations closed at the exhaust port 225. Can be formed. By partially closing the exhaust port 225, it is possible to prevent the outside of the electronic device 215 from spreading, and from the open portion, flammable gas generated by combustion, high-temperature heat and smoke are removed from the electronic device 215. It can be discharged to the outside and further combustion can be suppressed. Therefore, the self-extinguishing function of the electronic device 215 can be improved.

  Incidentally, in the example shown in FIGS. 17 to 29 described above, the three door portions 230A to 230C are provided in the exhaust port 225. However, the present embodiment is not limited to this example, and FIG. 30 and FIG. As shown in FIG. 31, the one door part may be provided in the exhaust port.

  Here, FIGS. 30 and 31 are perspective views (No. 1) and (No. 2) of the exhaust port of the electronic device according to the first modification of the electronic device 215 shown in FIG.

  As shown in FIG. 30, in this modification, one door 330 having a length slightly shorter than the overall width of the exhaust port 325 is provided, and the hinge 201 is changed in the same manner as the doors 230A to 230C described above. The top plate 26 is rotatably provided by its own weight.

  Further, the exhaust port 325 is provided with a door rotation stop plate 310 having an opening 305 that is slightly larger than the door 330, and the door 330 is provided in the same manner as in the examples shown in FIGS. Rotation of the door part 330 is stopped when it rotates by its own weight and comes into contact with the door part rotation stop plate 310. And the closed state of the exhaust port 325 by the door part 330 is maintained by the wind pressure of the air which distribute | circulates from the bottom to the inside in the inside of the electronic apparatus 315 with the fan provided in the lower part of the electronic apparatus 315.

  In the vicinity of the upper inner surface of the electronic device 315, a pair of leaf springs 250 partially attached to the top plate 26, and a rope 255 is stretched between the pair of leaf springs 250. The pair of leaf springs 250 in this modification has the same arrangement interval, the mounting structure to the top plate 26, and the shape as the pair of leaf springs 250 in the examples shown in FIGS. Further, the rope 255 in this modification is also attached to the leaf spring 250 in the same manner as the rope 255 in the example shown in FIGS.

  Further, in this modification, a large number of small opening holes 350 having a diameter of about 1 mm to 3 mm are formed in the door 330 at intervals of about 10 mm to 30 mm, for example.

  When the electronic device 215 is in a normal state, the door 330 is located between the top plate 26 and the front end portion of the main body 250a of the leaf spring 250 on the back side of the electronic device 215.

  On the other hand, when a fire occurs inside the electronic device 215, the portion near the fire occurrence location in the rope 255 is cut by combustion or melting by a flame or the rope 255 is extended by heat, The leaf spring 250 is restored, and the leaf spring 250 is displaced to the outside of the door portion 330 so that the support of the door portion 330 by the leaf spring 250 is released. If it does so, the door part 330 will rotate via the hinge 201 with dead weight.

  When the door 330 is brought into contact with the door rotation stop plate 210 by the rotation, the rotation of the door 230B is stopped as shown in FIG. The closed state of the exhaust port 325 by the door 330 is maintained by the wind pressure of the air that is forcibly taken in from the outside by the above-described fan and flows from the bottom to the top inside the electronic device 315.

  As described above, in this modification, the rope 255 is stretched over the substantially entire length of the exhaust port 325, and one door portion 330 is provided. Therefore, even if a fire occurs in any part of the electronic device 315, a portion of the rope 255 close to the fire occurrence part is cut, and the entire exhaust port 325 is closed by the single door 330. Therefore, it is possible to prevent the spread of the electronic device 315 to the outside.

  In this modification, a large number of opening holes 350 are formed in the door 330. Therefore, flammable gas, high-temperature heat, and smoke generated by combustion can be discharged to the outside of the electronic device 315 through the opening hole 350, and further combustion can be suppressed. Therefore, the self-extinguishing function of the electronic device 315 can be improved.

  In other words, in the present modification, a large number of opening holes 350 formed in the door portion 330 are formed in the three door portions 230A to 230C when a fire occurs in the electronic device 215 in the example shown in FIGS. The door part which has opened the exhaust port 325 partially is played without closing.

  The flame spreads along the closed door portion 330 and a part of the flame goes out of the electronic device 315 through the opening hole 350 formed in the door portion 330. However, the opening hole 350 is a small hole. For this reason, the length of the flame jumping is short, and the spread of the flame to the outside of the electronic device 315 is prevented.

  Furthermore, in this modification, the number of door portions is one, and only one pair of leaf springs 250 is required, so that the number of parts can be reduced, and thus the manufacturing cost can be reduced. it can.

  In FIGS. 17 to 29, the end of the rope 255 is attached to a leaf spring 250 (rope attachment portion 250c) partially attached to the top plate 26, and the rope 255 is connected to the door portion 230A to 230A. It is stretched in the width direction of 230C. However, the present embodiment is not limited to this example, and may be an embodiment shown in FIG. Here, FIG. 32 is a perspective view of the exhaust port 425 of the electronic device 415 according to the second modification of the electronic device 215 shown in FIG.

  Referring to FIG. 32, in this example, the leaf spring 250 (for example, see FIG. 19) is not provided, and the rope 255 is provided between the door portion 230B and the door portion 230A and between the door portion 230B and the door portion 230C. Between the door partition plate 220 and the upper inner surface of the electronic device 215, and is stretched between the door partition plate 220 and the upper inner surface of the electronic device 215. .

  When the electronic device 415 is in a normal state, the doors 230A to 230C are directly supported from below by the rope 255 so that the doors 230A to 230C do not rotate due to their own weight.

  On the other hand, when a fire occurs inside the electronic device 215, the rope 255 is cut by burning or melting of the rope 255 due to flame, and the support of the door portions 230A to 230C by the rope 255 is released. Then, the door portions 230A to 230C rotate through the hinge 201 by their own weight. When the door portions 230A to 230C come into contact with the door portion rotation stop plate 210 by the rotation, the rotation of the door portions 230A to 230C is stopped. Then, the closed state of the exhaust port 425 by the door portions 230A to 230C is maintained by the wind pressure of the air that is forcibly taken in from the outside by the above-described fan and flows from the bottom to the top inside the electronic device 415. .

  Also in this structure, as in the example shown in FIGS. 17 to 29, when a fire occurs in the electronic device 415, the three door portions 230A to 230C are closed at the exhaust port 425 and the opening is closed. Can be formed. By partially closing the exhaust port 425, it is possible to prevent the outside of the electronic device 415 from spreading, and from the open portion, flammable gas generated by combustion, high-temperature heat and smoke are removed from the electronic device 415. It can be discharged to the outside and further combustion can be suppressed. Therefore, the self-extinguishing function of the electronic device 415 can be improved.

  Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and various modifications and changes are within the scope of the gist of the present invention described in the claims. It can be changed.

Regarding the above description, the following items are further disclosed.
(Appendix 1)
An electronic device having an exhaust port for exhausting air to the outside,
Comprising a door for closing the exhaust port when a predetermined temperature is reached;
The electronic device is characterized in that the exhaust port is closed when the door portion rotates based on the weight of the door portion and the wind pressure of air taken into the electronic device and discharged to the outside.
(Appendix 2)
An electronic device according to attachment 1, wherein
The door part is provided with a heat generation sensing member,
The electronic device according to claim 1, wherein the door portion is rotated by the operation of the heat detection member.
(Appendix 3)
An electronic device according to attachment 1, wherein
The exhaust port is formed in the upper part of the electronic device,
The electronic device is characterized in that the door portion is rotatably provided on a top plate of the electronic device.
(Appendix 4)
The electronic device according to attachment 2, wherein
The door portion is rotatably provided on a top plate of the electronic device, and the heat detection member is a first metal plate attached to the door portion and a second metal plate attached to the top plate. And
The electronic device, wherein the first metal plate and the second metal plate are bonded with a hot melt material.
(Appendix 5)
An electronic device according to appendix 4, wherein
The first metal plate and the second metal plate are bonded with the hot melt material in a state in which a separation portion is formed between the first metal plate and the second metal plate. An electronic device characterized by being made.
(Appendix 6)
An electronic device according to attachment 1, wherein
The door portion has a weight of a value larger than a value calculated from a wind pressure of the air taken into the electronic device and discharged to the outside × an area of the door portion on which the wind pressure acts ÷ gravitational acceleration. Electronic device characterized.
(Appendix 7)
The electronic device according to attachment 2, wherein
A plurality of the door portions are provided,
An electronic device, wherein each door portion is provided with the heat detection member. (Figure 3)
(Appendix 8)
The electronic device according to appendix 7,
The door part rotation stop member is a door part rotation stop plate in which a plurality of openings are formed,
The length between the adjacent openings is set longer than the length of the gap between the adjacent doors, and when the exhaust port is closed by the doors adjacent to each other, An electronic device in which an outer peripheral portion of the door portion is located between the opening portions adjacent to each other of the movement stop plate.
(Appendix 9)
A fire prevention mechanism of an electronic device having an exhaust port for exhausting air to the outside,
When a predetermined location inside the electronic device reaches a predetermined temperature, the heat generation sensing member is activated, and the door is not attached to the top plate,
The door portion rotates based on its own weight and the wind pressure of air taken into the electronic device and discharged to the outside, and the exhaust port is closed by the door portion. Fire prevention mechanism for electronic devices.
(Appendix 10)
A fire prevention mechanism for an electronic device according to appendix 9,
The rotation of the door part is started by the dead weight of the door part,
Due to the dead weight of the door part and the wind pressure of the air taken into the electronic device and discharged to the outside, the rotation of the door part is continued,
A fire prevention mechanism for an electronic device, wherein rotation of the door portion is stopped in a direction perpendicular to a horizontal plane, and the exhaust port is closed by the door portion.
(Appendix 11)
A fire prevention mechanism for an electronic device according to appendix 9,
A plurality of the door portions for closing the exhaust port are provided, and a heating temperature sensing member is provided for each door portion,
When the door portion located immediately above the heat source reaches the operating temperature of the heat generation detection member provided in the door portion, the heat generation detection member rotates based on the operation to close the exhaust port,
Of the doors provided at other locations, the doors at locations where the operating temperature of the corresponding heat generation detecting member has not been reached are in a state in which the exhaust port remains open. mechanism.
(Appendix 12)
An electronic device having an exhaust port for exhausting air to the outside,
A door portion that closes the exhaust port when rotated;
A linear member that is stretched over substantially the entire width of the door portion and holds the door portion in an open state with respect to the exhaust port;
The electronic device according to claim 1, wherein when the linear member is cut or extends beyond a predetermined length, the door portion is rotated by its own weight to close the exhaust port.
(Appendix 13)
The electronic device according to attachment 12, wherein
The exhaust port is provided with an elastic member,
The elastic member is elastically deformed by attaching the linear member,
The elastic member that is elastically deformed supports the door portion, and the state where the door portion is opened with respect to the exhaust port is maintained.
When the linear member is cut or extended beyond a predetermined length, the elastic member is restored, the support of the door part is released, and the door part is rotated by its own weight to close the exhaust port. An electronic device characterized by that.
(Appendix 14)
The electronic device according to attachment 13, wherein
The elastic member is disposed near both ends of the door portion,
The length of the linear member in a state before being attached to the elastic member is shorter than the interval between the elastic members,
The electronic device, wherein the linear member is attached to the elastic member, and is elastically deformed inside the door portion by being pulled by the linear member.
(Appendix 15)
The electronic device according to attachment 12, wherein
At least three door portions that close the exhaust port when rotated are provided,
The electronic device according to claim 1, wherein an area of a door portion located in a substantially central region of the exhaust port is larger than an area of a door portion located in a region adjacent to the substantially central region.
(Appendix 16)
The electronic device according to appendix 15, wherein
Between the adjacent door parts, a door part partition plate is provided,
The exhaust port is partitioned by the door partition plate,
The electronic device is characterized in that a portion that is not partitioned by the door partition plate is formed on the side opposite to the side where the exhaust port is provided.
(Appendix 17)
The electronic device according to attachment 12, wherein
One electronic device is provided that closes the exhaust port when rotated, and an opening hole is formed in the door.
(Appendix 18)
A fire prevention mechanism of an electronic device having an exhaust port for exhausting air to the outside,
The electronic device is
A plurality of doors closing the exhaust port when rotated;
A plurality of linear members that are stretched corresponding to each of the door portions and hold the door portion in an open state with respect to the exhaust port,
When the linear member is cut or extended to a predetermined length or more, the door portion rotates by its own weight to close the exhaust port,
When a fire occurs in the electronic device, among the plurality of door portions, at least one door portion closes the exhaust port, and at least one door portion maintains the open state of the exhaust port. .
(Appendix 19)
A fire prevention mechanism for an electronic device according to appendix 18,
Between each door part, provided with a door part partition plate having an opening on the side far from the exhaust port,
A fire prevention mechanism for an electronic device, wherein when a fire occurs in the electronic device and one of the doors is closed, a flame is guided to a side far from the exhaust port.

It is a perspective view of the conventional electronic device. 1 is a front view of an electronic device in which electronic devices according to a first embodiment of the present invention are provided in a plurality of stages. It is a back perspective view when the electronic device concerning a 1st embodiment of the present invention is seen from the bottom. FIG. 4 is a cross-sectional view of the upper portion of the electronic device taken along line AA in FIG. 3. It is a perspective view which shows a door part and the structure of its periphery. It is FIG. (1) which shows rotation of a door part. It is a figure for demonstrating the weight of a door part. It is a figure (the 2) which shows rotation of a door part. It is a figure (the 3) which shows rotation of a door part. It is a front view (the 1) of an electronic device showing a simulation result of a fire prevention test of an electronic device concerning a 1st embodiment of the present invention. It is a front view (the 2) of the electronic device which shows the simulation result of the fire prevention test of the electronic device which concerns on the 1st Embodiment of this invention. It is a front view (the 3) of the electronic device which shows the simulation result of the fire prevention test of the electronic device which concerns on the 1st Embodiment of this invention. It is FIG. (1) for demonstrating the closing operation | movement of the door part adjacent to the one door part which has closed the exhaust port. It is FIG. (2) for demonstrating the closing operation | movement of the door part adjacent to the one door part which has closed the exhaust port. FIG. 10 is a rear perspective view (No. 1) of an electronic device according to a modification of the electronic device shown in FIG. 3 when viewed from below. FIG. 7 is a rear perspective view (No. 2) of an electronic device according to a modification of the electronic device shown in FIG. 3 when viewed from below. It is a back perspective view when the electronic device which concerns on the 2nd Embodiment of this invention is seen from the bottom. It is a disassembled perspective view for demonstrating the structure of the exhaust port of the electronic device shown in FIG. It is the perspective view which looked at the exhaust port of the electronic device shown in FIG. 17 from the downward direction. It is a figure which expands and shows the part enclosed with the dotted line in FIG. FIG. 18 is a top view of the electronic device shown in FIG. 17 with the top plate removed. It is a figure which expands and shows the area | region in which the door part 230B was provided among the exhaust ports shown in FIG. It is the perspective view which looked at the area | region in which the door part 230B shown in FIG. 22 was provided from the bottom. FIG. 18 is a view (No. 1) for explaining the turning operation of the door portion when a fire occurs inside the electronic device shown in FIG. 17; FIG. 18 is a diagram (No. 2) for explaining the turning operation of the door portion when a fire occurs inside the electronic device shown in FIG. 17; FIG. 18 is a diagram (No. 3) for explaining the pivoting operation of the door portion when a fire occurs inside the electronic device illustrated in FIG. 17; It is a figure for demonstrating operation | movement of a door part when a fire generate | occur | produces near the center of the electronic device shown in FIG. It is FIG. (1) for demonstrating operation | movement of a door part when a fire generate | occur | produces in the door part partition board vicinity. It is FIG. (2) for demonstrating operation | movement of a door part when a fire generate | occur | produces in the door part partition board vicinity. FIG. 18 is a perspective view (No. 1) of an exhaust port of an electronic device according to a first modification of the electronic device shown in FIG. 17. FIG. 18 is a perspective view (No. 2) of an exhaust port of an electronic device according to a first modification of the electronic device shown in FIG. 17. It is a perspective view of the exhaust port of the electronic device which concerns on the 2nd modification of the electronic device shown in FIG.

Explanation of symbols

15, 100, 215, 315, 415 Electronic device 24 Partition plate 25, 225, 325, 425 Exhaust port 26 Top plate 27 Fan 30, 230, 330 Door 32 Stopper 33 Thermal fuse 34 First metal plate 35 Second Metal plates 110 and 210 Door rotation stop plates 115 and 205 Opening 220 Door partition plate 255 Rope 250 Plate spring 350 Opening hole

Claims (5)

An electronic device having an exhaust port for exhausting air to the outside,
Comprising a door for closing the exhaust port when a predetermined temperature is reached;
The electronic device is characterized in that the exhaust port is closed when the door portion rotates based on the weight of the door portion and the wind pressure of air taken into the electronic device and discharged to the outside. A fire prevention mechanism of an electronic device having an exhaust port for exhausting air to the outside,
When a predetermined location inside the electronic device reaches a predetermined temperature, the heat generation sensing member is activated, and the door is not attached to the top plate,
The door portion rotates based on its own weight and the wind pressure of air taken into the electronic device and discharged to the outside, and the exhaust port is closed by the door portion. Fire prevention mechanism for electronic devices. An electronic device having an exhaust port for exhausting air to the outside,
A door portion that closes the exhaust port when rotated;
A linear member that is stretched over substantially the entire width of the door portion and holds the door portion in an open state with respect to the exhaust port;
The electronic device according to claim 1, wherein when the linear member is cut or extends beyond a predetermined length, the door portion is rotated by its own weight to close the exhaust port. The electronic device according to claim 3,
The exhaust port is provided with an elastic member,
The elastic member is elastically deformed by attaching the linear member,
The elastic member that is elastically deformed supports the door portion, and the state where the door portion is opened with respect to the exhaust port is maintained.
When the linear member is cut or extended beyond a predetermined length, the elastic member is restored, the support of the door part is released, and the door part is rotated by its own weight to close the exhaust port. An electronic device characterized by that. A fire prevention mechanism of an electronic device having an exhaust port for exhausting air to the outside,
The electronic device is
A plurality of doors closing the exhaust port when rotated;
A plurality of linear members that are stretched corresponding to each of the door portions and hold the door portion in an open state with respect to the exhaust port,
When the linear member is cut or extended to a predetermined length or more, the door portion rotates by its own weight to close the exhaust port,
When a fire occurs in the electronic device, among the plurality of door portions, at least one door portion closes the exhaust port, and at least one door portion maintains the open state of the exhaust port. .