JP2005050989A - Shelf for housing printed wiring board and shelf structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shelf and a shelf structure that can improve the cooling capacity by reducing the ventilation resistance and improving the fan efficiency. <P>SOLUTION: In a shelf 1, an open air introduced through an end opening from the outside of a second guide rail group flows between the adjoining printed wiring boards 50 in the shelf 1, and it is discharged to the outside from the end opening of a first guide rail group by a fan 105. Since the cross sections of the respective guide rails 10 of all the guide rail groups are circular or elliptical, the forced-draft open air can be smoothly introduced along the guide rail 10 of the second guide rail group when the open air is introduced into the shelf 1, and it can be also smoothly discharged along the curved face of the guide rail 10 of the first guide rail group when the open air is discharged to the outside of the shelf 1. Therefore, the fan efficiency and the cooling capacity for the printed wiring board 50 can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shelf for storing a plurality of printed wiring boards on which electronic components are mounted in parallel, and a shelf structure including a plurality of shelves, and in particular, configured to cool the printed wiring board by forced ventilation by a fan. Shelf and shelf structure.

  For example, as shown in the perspective view of FIG. 30 and the exploded perspective view of FIG. 31, the conventional communication device 101 has shelves 103 and 104, a fan 105, a heat, and a rack 102 formed by welding metal sheet metal parts. A shielding plate 106 or the like is attached, and is installed in a base station building or the like. A plurality of printed wiring boards 50 on which electronic components are mounted are accommodated in parallel in the shelves 103 and 104, and each printed wiring board 50 is mounted on a back wire board 108 provided in each shelf 103 and 104 to be electrically connected. Functional.

  Further, as shown in a schematic configuration diagram showing the inside of the communication apparatus 101 in FIG. 32, the shelf 103 is cooled by forced ventilation by the fan 105, while the other shelf 104 in which the exhaust heat is arranged is heated. In order to avoid this, a heat shielding plate 106 is disposed between the shelves 103 and 104. The fan 105 is composed of, for example, two rows of a first fan 105a and a second fan 105b. The heat shielding plate 106 is a partition that obliquely partitions an exhaust path for discharging warm air discharged from the shelf 103 through the fan 105 to the back side and an introduction path for passing outside air from the front side to the shelf 104. It has the board 106a and is arrange | positioned so that the fan 105 may be covered above it.

  For example, as shown in FIG. 33, the shelf 103 is configured by a side plate 111, 112, lower beams 121, 122, 123 and upper beams 131, 132, 133 assembled by rivets or the like to form a rectangular parallelepiped frame. A plurality of guide rails 110 are fitted and attached so as to bridge the upper and lower beams. In some cases, a partition plate 141 is provided to bridge the center of each beam in order to prevent the entire shelf 103 from bending. When the fan 105 provided on the upper portion of the shelf 103 is driven, air is sucked up from below, and the cooling air flows through the shelf 103 to cool the internal printed wiring board 50.

  In recent years, there has been a demand for an increase in capacity and output of such a communication device, and accordingly, the number of printed wiring boards 50 to be accommodated has increased and power consumption has increased. However, in the above conventional configuration, the guide rail 110 as shown in a perspective view in FIG. 34A is provided at the entrance (one end opening of the shelf 103) and the exit (the other end opening of the shelf 103) of the ventilation path. Since a plurality of them are arranged, there is a problem that they become ventilation resistance and fan efficiency does not increase. This is because the air is disturbed particularly when the air collides with the edge portion 110a of the guide rail 110, as shown in FIG. It is thought that this is because ventilation resistance increases.

  In particular, as shown in FIG. 33, when the beams 122 and 132 that support the middle of the guide rail 110 are provided in order to ensure the support strength of the guide rail 110, the ventilation resistance is further increased. As a result, there was a problem that the cooling performance was further lowered.

  Furthermore, in the configuration of the conventional heat shield plate 106 of FIG. 32, the interval between the discharge portions (A portion) on the first fan 105a side is narrowed by the partition plate 106a, so the pressure loss resistance of the first fan 105a is reduced. As a result, the amount of exhaust air from the shelf 103 was reduced, and as a result, the amount of heat released was reduced. Moreover, since the pressure of this discharge part is large, even if the first fan 105a fails, the air discharged from the second fan 105b flows back to the first fan 105a side, and even if the first fan 105a is restored, Since the torque at the initial startup of the fan is small, the first fan 105a may rotate in the reverse direction. As a result, there is a problem that the ventilation resistance of the fan 105 is increased and the cooling performance is lowered.

The conventional configuration described above is related to known and publicly used technologies. On the other hand, for example, the cross-sectional shape of the guide rail is made triangular, Y-shaped or V-shaped to reduce the ventilation resistance in the shelf. Techniques to be performed are disclosed in prior art documents (for example, Patent Document 1 and Patent Document 2).
JP-A-11-97866 (paragraph number [0006] etc.) JP-T-2002-516494 (paragraph number [0022] etc.)

  However, even if the cross-sectional shape of the guide rail is made as described in the above-mentioned patent document, the ventilation resistance at the guide rail portion is still due to the influence of the edge portion, as can be seen from the experimental results of the inventors described later. high. As a result, there is a problem that sufficient ventilation cannot be obtained in the shelf due to pressure loss in the guide rail portion, and the cooling performance cannot be sufficiently improved.

  This invention is made in view of such a point, and it aims at providing the shelf and shelf structure which can improve cooling performance by reducing ventilation resistance and improving fan efficiency. .

  In the present invention, in order to solve the above problem, as shown in FIGS. 1 to 3, a pair of side plates 11 and 12 facing each other and a plurality of bridges connecting the pair of side plates 11 and 12 in the facing direction. A shelf 1 for housing a plurality of printed wiring boards 50 on which electronic components are mounted in parallel, and comprising a frame formed by the beams 21, 22, 31, 32, A first guide rail group including a plurality of guide rails 10 arranged in parallel so as to bridge a pair of adjacent beams 21 and 22 constituting two adjacent sides, and a pair constituting the other two adjacent sides of the frame body The plurality of guide rails 10 are arranged in parallel so as to bridge the beams 31 and 32, and the guide rails 10 are arranged to face the guide rails 10 of the first guide rail group. The A second guide rail group configured to guide the insertion of the printed wiring board 50, and by forced ventilation by driving of the fan 105 installed in the end opening on the first guide rail group side. The second guide rail group side is configured to cool the plurality of printed wiring boards 50 by introducing outside air from the end opening on the side of the second guide rail group, and each guide rail 10 is a portion disposed at least in the ventilation path A shelf 1 is provided in which the cross section is formed in a circular shape or an elliptical shape.

  In such a shelf 1, the outside air introduced from the outside of the second guide rail group through the end opening flows between adjacent printed wiring boards 50 in the shelf 1, and the first guide rail group It is discharged to the outside through the fan 105 from the side end opening. Since the cross-section of each guide rail 10 of any guide rail group is circular or elliptical, the forced outside air is introduced along the guide rails 10 of the second guide rail group when introduced into the shelf 1. When the sheet is discharged out of the shelf 1, it is smoothly led out along the curved surface of the guide rail 10 of the first guide rail group.

  Further, the beam passes through the guide rail in the extending direction thereof, and the guide is inserted through the edge along the insertion direction of the printed wiring board to be engaged with the guide rail. A slit extending along the rail, and the guide rail has a cross-sectional shape that is locked to the wall surface of the beam that forms the through hole at the position of at least one beam that supports both ends of the guide rail. It is preferable that the guide rail is configured to be prevented from rotating about its own axis.

  The shape of this rotation prevention is determined by the relationship with the shape of the through hole of the beam, but the shape of the guide rail may be set based on the shape of the through hole of the beam, or conversely, based on the shape of the guide rail You may make it set the shape of a through-hole. In addition, this anti-rotation shape can prevent rotation of the guide rail if it is applied to either end of the guide rail, but it is more stable if it is applied to both ends of the guide rail. The guide rail can be fixed to

Further, at least a side surface of the beam facing the ventilation path may be formed in a rounded curved shape.
According to such a configuration, the draft resistance is reduced by the round shape of the beam portion as well as the guide rail.

  In the present invention, the printed wiring board includes a frame formed by a pair of side plates facing each other and a plurality of beams that bridge and connect the pair of side plates in the facing direction. A first guide rail group comprising a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting two adjacent sides of the frame And a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting the other two adjacent sides of the frame, each guide rail of each guide rail of the first guide rail group And a second guide rail group configured to guide insertion of the printed wiring board by both guide rails, and installed in an end opening on the first guide rail group side. By driving the fan, the plurality of printed wiring boards are cooled by forcibly venting outside air from the end opening on the second guide rail group side, and the guide rail and the beam are each a plate material A shelf is provided that is configured to stand up in the width direction and fixed to each other by cross-fitting through slits provided in the width direction.

  According to such a shelf, since the plate material is erected in the width direction, the cross sections of the guide rail and the beam are small, and the flow path cross section of the outside air is large. Further, since each beam does not extend long along the end portion of the guide rail, the ventilation region can be configured to be large at both end portions of the guide rail.

  Furthermore, in the present invention, a first shelf and a second shelf that are arranged in close proximity to each other and house a plurality of printed wiring boards on which electronic components are mounted in parallel therein, and an end of the first shelf A fan that is installed in the opening and forcibly ventilates the inside of the first shelf to cool the printed wiring board; and is installed between the fan and the second shelf. The fan extends from the first shelf to the fan. A partition plate for diagonally partitioning a discharge path for discharging the warm air discharged through and an introduction path for passing outside air through the second shelf, and is arranged to cover the fan There is provided a shelf structure characterized in that the partition plate has a curved portion so as to protrude toward the second shelf.

  According to such a shelf structure, since the space of the discharge path is increased due to the convex shape of the partition plate, the pressure loss resistance of the air discharged from the first shelf via the fan to the discharge path is reduced.

  Since the shelf of the present invention is formed so that the cross section of at least the portion of the guide rail disposed in the ventilation path has a circular shape or an elliptical shape, the ventilation resistance in the guide rail portion can be reduced. As a result, fan efficiency can be improved and the cooling performance of the printed wiring board can be improved.

  And by solving the problem that the shape of the guide rail is a shape that is locked at the through-hole portion of the beam, the cross section is circular or elliptical, so that it is easy to rotate around its own axis. Can do.

  In addition, if the side of the beam facing the ventilation path is formed in a curved shape with a rounded shape, it is possible to reduce the ventilation resistance at the beam due to the rounded shape, further improving the cooling performance of the entire shelf. Can be improved.

  In another shelf according to the present invention, the guide rail and the beam are configured by standing the plate material in the width direction, respectively, so that the cross section of the outside air flow path at the guide rail and the beam portion is increased, and the ventilation resistance is reduced. The ventilation efficiency of the shelf can be improved. In addition, since the guide rail and the beam are made of a plate material, the structure is simple and can be manufactured at low cost.

  In the shelf structure of the present invention, since the partition plate of the heat shielding plate provided between the first shelf and the second shelf is curved so as to protrude toward the second shelf, The pressure loss resistance of the air exhausted from the shelf is reduced. As a result, fan efficiency can be improved and cooling performance can be improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
In this embodiment, the shelf of the present invention is applied to a communication apparatus, and FIG. 1 is a perspective view showing a schematic configuration of the shelf. The configuration of the entire communication apparatus is substantially the same as the configuration of FIG. 30 and FIG. 31 described above except for the configuration of the shelf portion. Therefore, the same reference numerals are assigned to the same configurations as necessary. The description thereof will be omitted as appropriate.

  As shown in FIG. 1, the shelf 1 includes a pair of left and right side plates 11 and 12 facing each other, and lower beams 21 and 22 and an upper beam 31 that connect the pair of side plates 11 and 12 by bridging them in the facing direction. 32 and a rectangular parallelepiped frame. The lower beams 21 and 22 and the upper beams 31 and 32 are assembled to the side plates 11 and 12 by riveting or the like at both ends thereof. A plurality of elongate guide rails 10 are juxtaposed so as to bridge the lower beams 21 and 22 and the upper beams 31 and 32, respectively, and fitted to each beam at both ends in the longitudinal direction. (Note that the guide rail 10 that bridges the upper beams 31 and 32 is disposed under the fan 105). A plurality of guide rails 10 that bridge the upper beams 31 and 32 form a first guide rail group, and a plurality of guide rails that bridge the lower beams 21 and 22 form a second guide rail group. The guide rails 10 provided in each of the first guide rail group and the second guide rail group are arranged so as to be opposed to each other vertically and guide the printed wiring board 50 on which electronic components are mounted. And housed in the shelf 1.

  At the upper part of the shelf 1, a fan 105 including a first fan 105a and a second fan 105b arranged in two rows is provided. When the fan 105 is driven, air is sucked from below and introduced into the shelf 1. That is, outside air introduced from the outside of the second guide rail group through the end opening of the shelf 1 (the gap between the guide rails 10 on the second guide rail group side) is the adjacent printed wiring in the shelf 1. It flows between the substrates and is discharged to the outside through the fan 105 from the end opening of the shelf 1 on the first guide rail group side (the gap between the guide rails 10 on the first guide rail group side). Then, the printed wiring board 50 is cooled while the outside air flows through the shelf 1.

2A and 2B are explanatory views showing the configuration of the guide rail 10, wherein FIG. 2A shows a perspective view thereof, and FIG. 2B shows a side view thereof.
As shown in the figure, the guide rail 10 has a long cylindrical main body, and connection portions 13 connected to the beams are provided at both ends thereof.

  3A is a cross-sectional view taken along the line AA of FIG. 2B, and FIG. 3B is a cross-sectional view taken along the line BB of FIG. The main body has an elliptical cross section, and has a shape in which the lower half cross section of the connecting portion 13 is cut off. That is, the lower surface of the connection portion 13 is formed flat to form a contact portion with the beam surface, and a fitting projection 13a is provided at the center portion thereof. In other words, each guide rail 10 is formed so that its cross section is larger than the guide rail of the conventional configuration described above by making the cross section elliptical at the portion arranged in the ventilation path. It is supposed to be bigger. A guide groove 10a is formed in the upper part of the guide rail 10 for inserting and guiding the edge of the printed wiring board over the entire length thereof.

  On the other hand, each beam is formed of a member having a U-shaped cross section formed by bending a long plate material at a plurality of positions in a direction perpendicular to the longitudinal direction, and fitting holes are provided at equal intervals in a horizontal plane extending in the longitudinal direction. Is drilled. The guide rail 10 is connected and fixed to each beam by fitting the fitting projection 13a into the fitting hole of the beam.

  As shown in FIG. 3C, the guide rail 10 has an elliptical cross section so that the outside air flowing in the vicinity of the guide rail 10 of each guide rail group has an elliptical cross section. Is smoothly introduced along the guide rail 10 of the second guide rail group, and is smoothly led out along the curved surface of the guide rail 10 of the first guide rail group when discharged to the outside of the shelf 1. Will be. That is, since there is no edge portion where the outside air collides with the guide rail 10, the ventilation resistance at the guide rail portion can be reduced. As a result, the fan efficiency of the fan 105 can be improved and the cooling performance of the printed wiring board 50 can be improved.

In this embodiment, the cross-sectional shape of the guide rail 10 is an elliptical shape, but it may be a perfect circle.
4 to 6 are explanatory diagrams for confirming the effect of the shelf according to the present embodiment. FIG. 4 shows the analysis result of the ventilation resistance of the shelf according to the present embodiment. Represents the analysis result of the draft resistance of the conventional shelf. In each figure, the analysis model and the analysis result are shown on the left side, and the parameters of ventilation pressure (kg / m ² ) and flow velocity (m / s), which are the analysis results, are shown on the right side. In other words, in these analysis results, the ventilation pressure obtained by the analysis is indicated by a color-coded region, and the magnitude of the flow velocity at each part is indicated by the size of the arrow. As the analysis conditions, a printed wiring board having a height of 400 mm and a width of 240 mm, an interval between adjacent printed wiring boards of 20 mm, and a fan having the static pressure-air flow characteristics shown in FIG. 7 were adopted.

In the comparative example of FIG. 5, the cross-sectional shape of the guide rail is a square having a side of 10 mm. However, after passing through the guide rail, the ventilation pressure is greatly reduced and the flow velocity is also reduced. That is, it can be seen that the guide rail receives a large draft resistance. The average static pressure of the fan was 0.669 mmH ₂ O, and the air volume of the fan was 0.0381 m ³ / s.

In the comparative example of FIG. 6, the cross-sectional shape of the guide rail is a V-shape of 52 ° having a bottom surface portion of 4 mm and a top surface portion of 12 mm. Is greatly reduced, and the flow velocity is also reduced. That is, it can be seen that the guide rail receives a large draft resistance. The average static pressure of the fan was 0.921 mmH ₂ O, and the air volume of the fan was 0.0369 m ³ / s. That is, the fan efficiency is reduced by 3.2% compared to the case of FIG.

On the other hand, in the embodiment of FIG. 4, the cross-sectional shape of the guide rail is a circular shape having a diameter of 10 mm, but the ventilation pressure is maintained even after passing through the guide rail, and the decrease in the flow velocity is reduced. ing. That is, it turns out that the ventilation resistance in a guide rail is reduced. The average static pressure of the fan was 0.559 mmH ₂ O, and the air volume of the fan was 0.0388 m ³ / s. That is, the fan efficiency is improved by 2.0% compared to the case of FIG.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The present embodiment is the same as the configuration of the first embodiment except that the configuration of the guide rail and the beam is different. Therefore, the same components are denoted by the same reference numerals and the description thereof will be given. Is omitted. FIG. 8 is a perspective view illustrating a schematic configuration of the shelf according to the present embodiment, and FIG. 9 is an exploded perspective view of the shelf (however, a fan is omitted).

  As shown in FIGS. 8 and 9, also in the shelf 201 of the present embodiment, the lower beams 221, 222 and the upper beams 231, 232 are assembled to the side plates 11, 12 by riveting or the like at both ends thereof. Yes. A plurality of elongate guide rails 210 are arranged so as to bridge the lower beams 221 and 222 and the upper beams 231 and 232, and are fitted and attached to the beams at both ends in the longitudinal direction. Yes. A plurality of guide rails 210 that bridge the upper beams 231 and 232 form a first guide rail group, and a plurality of guide rails 210 that bridge the lower beams 221 and 222 form a second guide rail group. The guide rails 210 provided on each of the first guide rail group and the second guide rail group are paired up and down to guide the printed wiring board 50 and accommodate it in the shelf 201.

  FIG. 10 is an explanatory view showing an assembly structure of the guide rail 210 and the beams 221 and 222 constituting the second guide rail group, and FIG. 10A is a schematic exploded perspective view showing the assembly structure. FIG. 4B is a transverse sectional view showing the assembly structure, and FIG. 4C is an explanatory view of the assembly structure as viewed from the front.

  As shown in these drawings, the beam 221 is formed in a U-shaped cross-section by bending a long plate material at a plurality of positions in a direction perpendicular to the longitudinal direction, and at corresponding positions on both side surfaces thereof. A through hole 221a having a square cross section for penetrating the guide rail 210 in the extending direction is formed. A slit 221b extending along the guide rail 210 is formed on the upper surface (horizontal plane) of the beam 221 at the position of the through hole 221a.

  The beam 222 has a slit 222b along the guide rail 210 like the beam 221, but the through hole 222a is provided only on one side surface. Therefore, the guide rail 210 is sequentially inserted from the front side of the beam 221 into the through-holes of both beams 221 and 222, and the tip of the guide rail 210 hits the inner wall 222 c on the back side of the beam 222 and is locked. Then, in a state where all the guide rails 210 are inserted in this way, the elongated locking plate 241 is screwed and attached to the front surface of the beam 221 via the screw 242 so as to cover the through hole 221a. The movement of the guide rail 210 in the front-rear direction is fixed.

  On the other hand, as shown in FIG. 11A, a cross-section of the guide rail 210 is such that the guide rail 210 has a cross-section in which a circular upper end is cut out in a predetermined amount, and a flat engagement is caused by the cut-out portion. A stop surface 210a is configured. And the guide groove 210b which guides the printed wiring board 50 is formed so that the center of this latching surface 210a may be extended in a longitudinal direction. Then, the locking surface 210a of the guide rail 210 abuts and locks on the upper wall surface of each beam forming the through holes 221a and 222a, thereby preventing the guide rail 210 from rotating around its own axis. It is configured as follows.

  The assembly structure of the guide rail 210 and the beams 231 and 232 constituting the first guide rail group is vertically symmetrical with the above-described assembly structure on the second guide rail group side. Since it becomes a structure, it abbreviate | omits about the description.

  As shown in FIG. 11 (b), the guide rail 210 has a circular cross section so that the outside air flowing in the vicinity of the guide rail 210 of the second guide rail group has a circular cross section. At the time of introduction to the inside, it is smoothly introduced along the guide rail 210 of the second guide rail group. That is, since there is no edge portion where the outside air collides with the guide rail 210, the ventilation resistance at the guide rail portion can be reduced. As a result, the fan efficiency of the fan 105 can be improved and the cooling performance of the printed wiring board 50 can be improved. Further, by making the shape of the guide rail 210 a shape that is locked at the through-hole portion of the beam, it is possible to prevent rotation around its own axis. Thereby, the guide groove 210b of the guide rail 210 is always held at a fixed position, and the printed wiring board 50 can be stably guided.

  However, in this case, since the flat locking surface 210a on the first guide rail group side faces the shelf 201, it is preferable to make the locking surface 210a as small as possible. About the magnitude | size of this latching surface 210a, it can set suitably, considering the grade of ventilation resistance reduction.

  In the present embodiment, from the viewpoint of preventing the rotation of the guide rail 210, a locking surface 210a is formed over the entire length of the guide rail 210, and this is locked at the through hole portions of both beams 221 and 222. The configuration to be shown However, for example, such a locking structure is provided only at one end (on the beam 222 side in the present embodiment) of the guide rail 210 in the insertion direction, and the other guide rail 210 has a circular cross section. You may do it. In this way, since the cross section of the guide rail portion is circular, the effect of reducing the airflow resistance of the present embodiment can be exhibited more remarkably.

  In this embodiment, the cross-sectional shape of the guide rail 210 is substantially circular, but it may be elliptical. FIG. 12 is an explanatory diagram showing an assembly structure of guide rails and beams in that case. The figure (a) shows the cross-sectional shape of a guide rail, The figure (b) is explanatory drawing which looked at the said assembly structure from the front.

  As described above, the guide rail 210 ′ has an elliptical cross section, and the through-hole 221a ′ of the beam 221 ′ has a rectangular shape with the major axis and the minor axis of the ellipse having two sides. Its rotation is prevented and it is stably fixed in place. Further, in this case, since there is no flat portion as described above, no edge portion appears on the first guide rail group side, and the effect of reducing the ventilation resistance of the present embodiment can be remarkably exhibited.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. The present embodiment is the same as the configuration of the first embodiment except that the configuration of the guide rail and the beam is different. Therefore, the same components are denoted by the same reference numerals and the description thereof will be given. Is omitted. FIG. 13 is a perspective view illustrating a schematic configuration of the shelf according to the present embodiment.

  As shown in the figure, in the shelf 301 of the present embodiment, the guide rail 310 and each beam are configured by standing up a plate material in the width direction, respectively, and connect the pair of left and right side plates 11 and 12. Three beams and three lower beams are provided. That is, in addition to the lower beams 321 and 323 and the upper beams 331 and 333 that form the frame of the shelf 301, a lower beam 322 and an upper beam 332 that further support the guide rail 310 at the center thereof are provided to reinforce the shelf 301. is doing. A plurality of guide rails 310 that bridge the upper beams 331, 332, and 333 form a first guide rail group, and a plurality of guide rails 310 that bridge the lower beams 321, 322, and 323 form a second guide rail group.

FIG. 14A is an explanatory view showing the shapes of guide rails and beams and their connection structures, FIG. 14B is a detailed longitudinal sectional view of C part thereof, and FIG. 14C is its D part thereof. It is a detailed longitudinal cross-sectional view.
As shown in FIG. 2A, the guide rail 310 is a long plate having a rectangular cross section and having a thickness larger than that of the printed wiring board 50, and the center of the upper surface is in the longitudinal direction. A guide groove 310a is formed so as to extend in the direction. In addition, slits 310b, 310c, and 310d having a predetermined depth penetrating in the lateral direction are formed at joint positions of the beams 321, 322, and 323 on the lower surface side of the guide rail 310.

  On the other hand, each beam 321, 322, 323 is formed by standing a thin plate, its lower end edge is bent at a right angle for a predetermined length for reinforcement, and both longitudinal ends thereof are connected to the side plates 11, 12. In order to provide a rivet insertion hole for this purpose, it is bent at a right angle. In addition, slits 321a, 322a, and 323a are provided at fixed intervals at the upper end edges of the beams 321, 322, and 323, respectively, so that the beams can be fitted into the slits 310b, 310c, and 310d of the guide rail 310. .

As shown in FIGS. 4B and 4C, the width of the slit 310c at the center of the guide rail 310 is substantially equal to the thickness of the beam 322, but the widths of the slits 310b and 310d at both ends are respectively It is larger than the thickness of the beams 321 and 323. That is, a locking projection 310e protrudes from the center of one of the opposing surfaces of the slit 310b, and a locking hole 321b is formed at a corresponding position when the beam 321 is fitted. When the guide rail 310 is connected to the beam 321, the beam 321 is temporarily elastically deformed to bend in the slit 310 b and get over the locking projection 310 e, and the locking projection 310 e is fitted into the locking hole 321 b. By doing so, it is elastically restored and fixed. The same applies to the structure and assembly structure of the guide rail 310 and the beam 323.

The connection structure between the upper beams 331, 332, and 333 and the guide rail 310 is the same as described above, and thus the description thereof is omitted.
As described above, as shown in FIG. 13, the upper beams 331, 332, 333 and the lower beams 321, 322, 323 and the guide rail 310 are cross-fitted and joined in a lattice shape.

  According to the present embodiment, the cross section of the outside air flow path in the guide rail 310 and each beam portion is increased, the ventilation resistance is reduced, and the ventilation efficiency of the shelf 301 can be improved. Moreover, since the guide rail 310 and each beam are comprised from a board | plate material, a structure is simple and it can manufacture at low cost.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. In addition, since it is the same as that of the said 1st Embodiment except having the characteristic in the structure of a beam, the description is abbreviate | omitted by attaching | subjecting the same code | symbol about the same component. FIG. 15 is a side sectional view showing a schematic configuration of the shelf according to the present embodiment, and FIG. 16 is an explanatory view showing the function and effect thereof.

  As shown in FIG. 15, in the shelf 401 of the present embodiment, the upper beams 431 and 432 and the lower beams 421 and 422 are each configured by bending a long plate material at a plurality of positions in a direction perpendicular to the longitudinal direction. The cross section is made of a substantially U-shaped member, and fitting holes are formed at equal intervals on a horizontal plane extending in the longitudinal direction. The guide rail 10 is connected and fixed to each beam by fitting the fitting projection 13a into the fitting hole of the beam.

And especially the side surface which faces the ventilation path | route of each beam is formed in the curved shape with roundness. 16A is an enlarged view of a portion E in FIG. 15, and FIG. 16B is an enlarged view of a portion F in FIG.
As shown in FIG. 16 (a), the beam 421 has an R-shaped side surface 421a that forms a ventilation path between the beam 421 and the outside air introduced into the shelf 401 from below. The side surface 421a hits the shelf 401 smoothly. In addition, as shown in FIG. 5B, the beam 431 also has a side surface 431a that forms a ventilation path between the beam 431 and the guide rail 10 and has an R shape. It hits the side surface 431a and flows out of the shelf 401 smoothly. The beams 422 and 432 are arranged symmetrically with the beams 421 and 431 in the shelf 401, respectively, but the shapes thereof are the same, and the description thereof is omitted.

According to this Embodiment, ventilation resistance can be reduced by the R-shaped part of each beam, and ventilation efficiency can be improved as the whole shelf.
FIG. 17 shows a modification of the present embodiment.

  In the present embodiment, for example, the beam 421 having a U-shaped cross section shown in FIG. 16A is used. However, as shown in FIG. 17A, for example, the beam 421 has a S-shaped cross section. You may comprise as beam 421 '. By doing in this way, rigidity increases by the increase in the secondary moment of the section of the beam, and the shelf 401 can be reinforced. Of course, the beams 422, 431, and 432 can similarly have a S-shaped cross section.

  Further, when a beam is also provided in the center of each guide rail 10, it is preferable that the position of the center beam facing the ventilation path is a rounded curved shape. For example, as shown in FIG. 2B, an example of the central beam 423 provided on the second guide rail group side, it is conceivable that the both side surfaces 423a have an R shape. The same shape can be obtained when the central beam is provided on the first guide rail group side.

  In the present embodiment and the modification thereof, an example is shown in which the side surface facing the ventilation path of each beam is formed in a rounded curved shape, but the entire cross section of the beam is made to have a rounded curved shape. May be. Moreover, although the example which formed each beam by bending a board | plate material was shown, these can also be comprised from the cylindrical member which has a curved cross section.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described. The present embodiment is the same as the configuration of the first embodiment except that the configuration of the guide rail and the beam is different. Therefore, the description of the same components is omitted. FIG. 18 is a perspective view illustrating a schematic configuration of the shelf according to the present embodiment.

  As shown in the figure, in the shelf 501 of the present embodiment, a pair of left and right side plates 511 and 512, lower beams 521 and 522 that connect the pair of side plates 511 and 512 by bridging in the facing direction, and an upper It consists of a rectangular parallelepiped frame composed of beams 531 and 532. A plurality of twin rails 510 are arranged so as to bridge the upper beams 531 and 532 and the lower beams 521 and 522, respectively. A plurality of twin rails 510 that bridge the upper beams 531 and 532 form a first guide rail group, and a plurality of twin rails 510 that bridge the lower beams 521 and 522 form a second guide rail group. In addition, in order to reinforce the shelf 501, a partition plate 541 is provided so as to bridge the center of each beam.

FIG. 19 shows the structure of the twin rail 510, the lower beams 521, 522 and the side plates 511 and the mounting structure thereof.
As shown in the figure, the twin rail 510 is configured by connecting two guide rails 513 and 514 adjacent in parallel to each other at both ends in the longitudinal direction via positioning members 516 and 517. Both guide rails 513 and 514 each have a semi-elliptical cross section, and guide grooves 513a and 514a extending in the longitudinal direction at the center of the flat upper surface are formed. The positioning members 516 and 517 are made of a rectangular plate and are connected to the both guide rails 513 and 514 at a right angle. Further, a rib 515 that connects the guide rails 513 and 514 at the center thereof is provided to increase the rigidity of the twin rail 510.

On the other hand, each of the lower beams 521 and 522 has a U-shaped cross section, and is configured to fit the positioning members 516 and 517 to support the twin rail 510.
Further, locking projections 516a and 517a project from the center of the upper surface of the positioning members 516 and 517, respectively, while the upper surfaces of the lower beams 521 and 522 can be fitted into the locking projections 516a and 517a, respectively. Locking holes 521a and 522a are formed at regular intervals. When the twin rail 510 is connected to the lower beams 521 and 522, the positioning members 516 and 517 slide in the lower beams 521 and 522 while the locking projections 516a and 517a are temporarily elastically deformed and pressed. Move. Then, when the locking protrusions 516a and 517a come to the positions of the locking holes 521a and 522a, they are elastically restored and fitted into the locking holes 521a and 522a. In this way, the twin rail 510 is fixed at the set positions of the lower beams 521 and 522.

  In the above description, the attachment structure between the lower beams 521 and 522 and the twin rail 510 has been described. However, the same applies to the attachment structure between the upper beams 531 and 532 and the twin rail 510, and the description thereof will be omitted. .

FIG. 20 is an explanatory diagram illustrating a cross-sectional structure of a connection portion between the side plate 511 and the lower beam 521.
At positions corresponding to the beams 521, 522, 531 and 532 of the side plate 511, connection flanges 518 extending in the direction of the beams are provided. A locking projection 518 a is projected from the center of the connecting flange 518.

  On the other hand, a locking hole 521b is formed in the lower beam 521 at a position corresponding to the locking projection 518a when the side plate 511 is assembled, and a tool insertion hole 521c is formed at a position corresponding to the tip of the connecting flange 518. Is formed.

  When the side plate 511 is assembled to the lower beam 521, the tip end portion of the lower beam 521 is provided with the connecting flange 518 with the tapered spacer 551 interposed on the surface opposite to the locking projection 518a. Insert into. At this time, the connecting flange 518 is inserted in a state where it is elastically deformed along the tapered surface of the spacer 551 at a position in the vicinity of the locking projection 518a. The side plate 511 is fixed to the lower beam 521 by fitting 518a into the locking hole 521b.

  When the side plate 511 is removed from the lower beam 521, the locking projection 518a is locked by inserting the tip of a predetermined removal tool 552 into the tool insertion hole 521c and pushing the tip of the connecting flange 518. The side plate 511 is pulled out from the lower beam 521 by being detached from the hole 521b.

  In the above description, the mounting structure of the lower beam 521 and the side plate 511 has been described. However, since the mounting structure of the lower beam 521, 522 and the upper beam 531, 532 and the side plates 511, 512 is the same, the description thereof is omitted. Omitted.

  In this embodiment, the guide rail is configured as a twin rail 510, and a plurality of mounting positions are provided on each beam. For this reason, it becomes easy to cope with the increase or decrease of the twin rail 510. In addition, since the engagement between the engagement protrusion and the engagement hole can be performed elastically by simply inserting it, simple attachment / detachment can be realized.

  Further, since the guide rails 513, 514 constituting the twin rail 510 are connected by the positioning members 516, 517 at the both ends and the central rib 515, sufficient strength can be ensured. For this reason, it is not necessary to provide a bridging member for bridging them between the adjacent twin rails 510, and the ventilation resistance can be reduced at that portion, and the cooling performance can be improved.

  In the present embodiment, an example in which the first guide rail group and the second guide rail group are configured by twin rails in which two adjacent guide rails are integrally formed has been described. These guide rails can be integrally formed.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described. The present embodiment relates to a shelf structure in which the shelf is configured in two upper and lower stages, and a fan and a heat shield plate are interposed between them. The description will be focused on the parts, and the same components as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted. FIG. 21 is a perspective view showing a schematic configuration of a part of the shelf structure of the present embodiment, and FIG. 22 is a sectional side view of the shelf structure.

  As shown in FIGS. 21 and 22, in the shelf structure of the present embodiment, the lower first shelf 601 is cooled by forced ventilation by the fan 105 provided in the upper end opening thereof, A heat shielding plate 610 is disposed between the shelves 601 and 602 so that the exhaust heat does not heat the second shelf 602 disposed above. The fan 105 includes a first fan 105a and a second fan 105b arranged in two rows in the front and rear, and the heat shielding plate 610 discharges the warm air discharged from the first shelf 601 through the fan 105 to the back side. And a partition plate 613 that obliquely partitions the discharge path 611 and the introduction path 612 for allowing outside air to pass through the second shelf 602 from the front side, and is arranged so as to cover the fan 105 above.

  In particular, the partition plate 613 is curved and formed so as to protrude toward the second shelf 602 (introduction path side). That is, the partition plate 613 widens the flow path cross section of the discharge path 611 from the base end side (left side in the figure) to the terminal end side (right side in the figure). It is more convex toward the introduction path 612 than the conventional slope indicated by the dotted line. For this reason, in particular, the flow path cross section on the base end side of the discharge path 611 is larger than the conventional one.

  According to the present embodiment, since the cross section of the flow path becomes large especially on the base end side of the discharge path 611 where the pressure loss resistance becomes high, the pressure loss resistance of the air discharged from the first shelf 601 is reduced. Ventilation efficiency can be improved.

Moreover, the reduction | decrease of the exhaust air volume of the 1st shelf 601 can be suppressed, and as a result, the heat dissipation can be increased and the cooling performance can be improved.
Furthermore, since the pressure of the A portion discharge portion can be reduced as compared with the conventional case, the air discharged from the second fan 105b can be prevented or suppressed from flowing backward to the first fan 105a side. As a result, it is possible to prevent the first fan 105a from rotating backward when the first fan 105a is returned.

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described. Since the present embodiment has the same configuration as that of the sixth embodiment except that the configuration of the heat shielding plate is different, the same reference numerals are given to the same components as those of the sixth embodiment. A description thereof will be omitted, for example. FIG. 23 is a perspective view showing a schematic configuration of the shelf structure of the present embodiment, and FIG. 24 is a side sectional view of the shelf structure.

  As shown in FIG. 23 and FIG. 24, in the shelf structure of the present embodiment, the partition plate 713 of the heat shielding plate 710 protrudes toward the second shelf 602 at the base end portion of the discharge path 711. It is curved and formed flat from the middle part of the discharge path 711 toward the end part side.

  In FIG. 24, for the sake of convenience, the shape of the conventional partition plate is indicated by a two-dot chain line, and the shape of the partition plate in the sixth embodiment is indicated by a broken line. As can be seen from the figure, the discharge path 711 is wide at the base end portion (A portion), but is wider at the intermediate portion (G portion) than the conventional configuration and from the sixth embodiment. Is also narrower. For this reason, the flow path cross section of the introduction path 712 can be secured to some extent at the intermediate portion.

  Also in the present embodiment, since the cross section of the flow path becomes large especially on the base end side of the discharge path 711 where the pressure loss resistance becomes high, it is possible to reduce the pressure loss resistance of the air discharged from the first shelf 601. it can. For this reason, the effect similar to 6th Embodiment can be acquired.

  In addition, since the partition plate 713 is formed flat from the middle portion toward the terminal end side, an increase in air pressure loss resistance on the introduction path 712 side can be suppressed, and the cooling performance of the second shelf 602 can be suppressed. Can also be secured.

[Eighth Embodiment]
Next, an eighth embodiment of the present invention will be described. Since the present embodiment has the same configuration as that of the sixth embodiment except that the configuration of the heat shielding plate is different, the same reference numerals are given to the same components as those of the sixth embodiment. A description thereof will be omitted, for example. FIG. 25 is a perspective view showing a schematic configuration of the shelf structure of the present embodiment, and FIG. 26 is a side sectional view of the shelf structure.

  As shown in FIGS. 25 and 26, in the shelf structure of the present embodiment, the partition plate 813 of the heat shielding plate 810 has an S-shaped cross section as a whole, and the second end at the base end portion of the discharge path 811. It is curved so as to be convex toward the shelf 602 side, is formed flat at the intermediate portion of the discharge path 811, and is further convex toward the first shelf 601 side in the vicinity of the discharge port which is the terminal end of the discharge path 811. It is configured to be curved.

  In FIG. 26, the shape of the conventional partition plate is shown by a two-dot chain line for convenience. As can be seen from the figure, the discharge path 811 is wide at the base end (A part), but the introduction path 812 is wide at the terminal end (H part). For this reason, the flow path cross section of the introduction path 812 can be secured to some extent at the end portion.

  According to the present embodiment, in each of the discharge path 811 and the introduction path 812, the flow passage cross section of the portion where the pressure loss resistance is particularly high is increased, so that the ventilation efficiency of the discharge path 811 and the introduction path 812 can be improved. In addition, the cooling performance of the entire shelf structure can be improved.

[Ninth Embodiment]
Next, a ninth embodiment of the present invention will be described. Since the present embodiment has the same configuration as that of the sixth embodiment except that the configuration of the heat shielding plate is different, the same reference numerals are given to the same components as those of the sixth embodiment. A description thereof will be omitted, for example. FIG. 27 is a perspective view showing a schematic configuration of the shelf structure of the present embodiment, and FIG. 28 is a side sectional view of the shelf structure.

  As shown in FIGS. 27 and 28, in the shelf structure of the present embodiment, the partition plate 913 of the heat shielding plate 910 includes a plurality of openings 915 that allow the discharge path 911 and the introduction path 912 to communicate with each other. A diaphragm 916 that closes or opens 915 is provided.

  As conceptually showing the operation of the diaphragm 916 in FIG. 29, the diaphragm 916 is normally energized so as to cover and close the opening 915, while the pressure of the discharge passage 911 is equal to or higher than a predetermined set value. Then, it is configured to open to the introduction path 912 side.

  According to the present embodiment, similar to the sixth embodiment, the cross section of the flow path becomes large particularly on the base end side of the discharge path 911 where the pressure loss resistance is high, so that the first shelf 601 is discharged. The pressure loss resistance of the air can be reduced, and the diaphragm 916 is opened when the pressure loss resistance of the portion becomes larger than a predetermined value. For this reason, the same effect as that of the sixth embodiment can be obtained, and an excessive increase in the pressure loss resistance can be reliably prevented.

The present invention can be applied to a device that includes a shelf for housing a plurality of printed wiring boards on which electronic components are mounted in parallel, and cools the shelf by forced ventilation.
(Appendix 1)
It consists of a frame formed by a pair of side plates facing each other and a plurality of beams that bridge and connect the pair of side plates in the facing direction, and a plurality of printed wiring boards on which electronic components are mounted are arranged in parallel inside. A shelf for accommodating
A first guide rail group composed of a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting two adjacent sides of the frame body;
It comprises a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting the other two adjacent sides of the frame, and each guide rail is arranged opposite to each guide rail of the first guide rail group A second guide rail group configured to guide insertion of the printed wiring board by both guide rails;
With
The fan installed in the end opening on the first guide rail group side drives the outside air from the end opening on the second guide rail group side to cool the plurality of printed wiring boards. Configured to
Each of the guide rails is formed so that a cross section of at least a portion arranged in the ventilation path has a circular shape or an elliptical shape.

(Appendix 2)
Each guide rail is
The additional section according to claim 1, wherein the cross section of the portion disposed in the ventilation path is circular or elliptical so that the cross section is larger than the portion connected to the beam. Shelf.

(Appendix 3)
The beam passes through the guide rail in order to pass through a through hole for penetrating the guide rail in its extending direction and an edge along the insertion direction of the printed wiring board. A slit extending along the
The guide rail has a cross-sectional shape that is locked to the wall surface of the beam that forms the through hole at the position of at least one of the beams that supports both ends of the guide rail, and the guide rail rotates around its own axis. The shelf according to appendix 1, wherein the shelf is configured to be prevented.

(Appendix 4)
The beam is formed by bending a long plate material at a plurality of positions in a direction perpendicular to the longitudinal direction, a through hole having a square cross section for penetrating the guide rail in the extending direction, and the printed wiring board. A slit extending along the guide rail to engage the guide rail through an end edge;
The guide rail is provided with a locking surface formed flat along a guide groove for guiding the printed wiring board,
The locking surface of the guide rail is configured to be locked to the wall surface of the beam forming the through hole, so that rotation of the guide rail around its own axis is prevented. The shelf according to appendix 1.

(Appendix 5)
It consists of a frame formed by a pair of side plates facing each other and a plurality of beams that bridge and connect the pair of side plates in the facing direction, and a plurality of printed wiring boards on which electronic components are mounted are arranged in parallel inside. A shelf for accommodating
A first guide rail group composed of a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting two adjacent sides of the frame body;
It comprises a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting the other two adjacent sides of the frame, and each guide rail is arranged opposite to each guide rail of the first guide rail group A second guide rail group configured to guide insertion of the printed wiring board by both guide rails;
With
The fan installed in the end opening on the first guide rail group side drives the outside air from the end opening on the second guide rail group side to cool the plurality of printed wiring boards. Configured to
The guide rail and the beam are each configured by standing a long plate material in the width direction and fixed to each other by cross-fitting through a slit provided in the width direction. A featured shelf.

(Appendix 6)
The shelf according to claim 1, wherein at least a side surface of the beam facing the ventilation path is formed in a rounded curved shape.

(Appendix 7)
It consists of a frame formed by a pair of side plates facing each other and a plurality of beams that bridge and connect the pair of side plates in the facing direction, and a plurality of printed wiring boards on which electronic components are mounted are arranged in parallel inside. A shelf for accommodating
A first guide rail group composed of a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting two adjacent sides of the frame body;
It comprises a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting the other two adjacent sides of the frame, and each guide rail is arranged opposite to each guide rail of the first guide rail group A second guide rail group configured to guide insertion of the printed wiring board by both guide rails;
With
The fan installed in the end opening on the first guide rail group side drives the outside air from the end opening on the second guide rail group side to cool the plurality of printed wiring boards. Configured to
Each of the first guide rail group and the second guide rail group is integrated so that at least two adjacent guide rails are connected via plate-shaped positioning members provided at both ends in the longitudinal direction. It consists of multiple molded rail units,
The shelf according to claim 1, wherein each rail unit is fixed to the beam by the positioning member being locked to a predetermined setting position of the beam.

(Appendix 8)
The shelf according to appendix 7, wherein the positioning member is provided with a positioning projection or a positioning hole that can be elastically attached to and detached from a positioning hole or a positioning projection provided in the beam.

(Appendix 9)
Each of the first guide rail group and the second guide rail group is integrally formed such that two adjacent guide rails are connected via plate-shaped positioning members provided at both ends in the longitudinal direction. Consisting of multiple twin rails,
The shelf according to appendix 7, wherein the positioning member is provided with a positioning protrusion or a positioning hole that is elastically fitted to a positioning hole or a positioning protrusion provided in the beam.

(Appendix 10)
The shelf according to appendix 7, wherein a reinforcing rib for connecting the guide rail constituting the rail unit at an intermediate portion in the longitudinal direction thereof is provided.

(Appendix 11)
A first shelf and a second shelf that are arranged in close proximity to each other and house a plurality of printed wiring boards on which electronic components are mounted in parallel;
A fan that is installed at an end opening of the first shelf and forcibly ventilates the first shelf to cool the printed wiring board;
A discharge path installed between the fan and the second shelf, for discharging air discharged from the first shelf through the fan, and for passing outside air through the second shelf; A heat shielding plate that has a partition plate that obliquely partitions the introduction path, and is arranged to cover the fan;
With
The shelf structure, wherein the partition plate has a curved portion so as to protrude toward the second shelf.

(Appendix 12)
The shelf structure according to appendix 11, wherein a plurality of the fans are provided and arranged in a plurality of rows from the base end side to the terminal end side of the discharge path.

(Appendix 13)
The shelf according to claim 11, wherein the partition plate is curved so as to protrude toward the second shelf at a base end portion of the discharge path, and is formed flat at an intermediate portion of the discharge path. Construction.

(Appendix 14)
14. The shelf structure according to appendix 13, wherein the partition plate is configured to be curved so as to protrude toward the first shelf in the vicinity of a discharge port that is a terminal portion of the discharge path.

(Appendix 15)
The partition plate is
A plurality of openings for communicating the discharge path and the introduction path;
A diaphragm configured to open to the introduction path side when the pressure of the discharge path reaches a predetermined set value while being urged to cover and close the opening.
The shelf structure according to appendix 11, wherein the shelf structure is provided.

(Appendix 16)
The shelf structure according to appendix 11, wherein at least the first shelf has the shelf structure according to appendix 1.

It is a perspective view showing schematic structure of the shelf concerning the 1st Embodiment of this invention. It is explanatory drawing showing the structure of the guide rail which comprises the shelf of 1st Embodiment. It is explanatory drawing showing the structure of the guide rail which comprises the shelf of 1st Embodiment. It is explanatory drawing for confirming the effect of the shelf concerning a 1st embodiment. It is explanatory drawing for confirming the effect of the shelf concerning a 1st embodiment. It is explanatory drawing for confirming the effect of the shelf concerning a 1st embodiment. It is explanatory drawing for confirming the effect of the shelf concerning a 1st embodiment. It is a perspective view showing schematic structure of the shelf concerning the 2nd Embodiment of this invention. It is a disassembled perspective view of the shelf concerning 2nd Embodiment. It is explanatory drawing showing the assembly structure etc. of the guide rail and beam which comprise the 2nd guide rail group concerning 2nd Embodiment. It is explanatory drawing showing the assembly structure etc. of the guide rail and beam which comprise the 2nd guide rail group concerning 2nd Embodiment. It is explanatory drawing showing the assembly structure etc. of the guide rail and beam concerning the modification of 2nd Embodiment. It is a perspective view showing schematic structure of the shelf concerning the 3rd Embodiment of this invention. It is explanatory drawing showing the shape of the guide rail and beam concerning 3rd Embodiment, and those connection structures. It is a sectional side view showing the schematic structure of the shelf concerning the 4th Embodiment of this invention. It is explanatory drawing showing the effect of the shelf concerning 4th Embodiment. It is a sectional side view showing the schematic structure of the shelf concerning the modification of 4th Embodiment. It is a perspective view showing schematic structure of the shelf concerning the 5th Embodiment of this invention. It is explanatory drawing which shows the structure of the twin rail concerning a 5th Embodiment, a lower beam, and a side plate, and its attachment structure. It is explanatory drawing showing the cross-section of the connection part of the side plate and lower beam concerning 5th Embodiment. It is a perspective view showing schematic structure of the shelf structure concerning the 6th Embodiment of this invention. It is one side sectional drawing of the shelf structure concerning 6th Embodiment. It is a perspective view showing schematic structure of the shelf structure concerning the 7th Embodiment of this invention. It is one side sectional drawing of the shelf structure concerning 7th Embodiment. It is a perspective view showing schematic structure of the shelf structure concerning the 8th Embodiment of this invention. It is one side sectional drawing of the shelf structure concerning 8th Embodiment. It is a perspective view showing schematic structure of the shelf structure concerning the 9th Embodiment of this invention. It is one side sectional drawing of the shelf structure concerning 9th Embodiment. It is explanatory drawing which shows notionally the operation | movement of the diaphragm which comprises the shelf structure concerning 9th Embodiment. It is a perspective view showing schematic structure of the conventional communication apparatus. It is a disassembled perspective view showing schematic structure of the conventional communication apparatus. It is a schematic block diagram showing the inside of the conventional communication apparatus. It is a perspective view showing schematic structure of the conventional shelf. It is explanatory drawing showing the schematic structure of the guide rail which comprises the conventional shelf.

Explanation of symbols

1,201,301,401,501 Shelf 10, 210, 310 Guide rail 11, 12, 511, 512 Side plate 13a Fitting protrusion 21, 22, 221, 222, 321, 322, 323 Lower beam 421, 422, 423 521, 522 Lower beam 31, 32, 231, 232, 331, 332, 333 Upper beam 431, 432, 531, 532 Upper beam 50 Printed wiring board 221a, 222a Through hole 221b Slit 310a Guide groove 310b, 310c, 310d, 321a Slit 310e Locking protrusion 321b Locking hole 510 Twin rail 513, 514 Guide rail 515 Rib 516 Positioning member 516a Locking protrusion 521a, 522a Locking hole 601 First shelf 602 Second shelf 610, 710, 810, 910 Heat shielding plate 611,711,811,911 discharge path 612,712,812,912 introduction path 613,713,813,913 partition plate 915 opening 916 diaphragm

Claims (5)

It consists of a frame formed by a pair of side plates facing each other and a plurality of beams that bridge and connect the pair of side plates in the facing direction, and a plurality of printed wiring boards on which electronic components are mounted are arranged in parallel inside. A shelf for accommodating
A first guide rail group composed of a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting two adjacent sides of the frame body;
It comprises a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting the other two adjacent sides of the frame, and each guide rail is arranged opposite to each guide rail of the first guide rail group A second guide rail group configured to guide insertion of the printed wiring board by both guide rails;
With
The fan installed in the end opening on the first guide rail group side drives the outside air from the end opening on the second guide rail group side to cool the plurality of printed wiring boards. Configured to
Each of the guide rails is formed so that a cross section of at least a portion disposed in the ventilation path has a circular shape or an elliptical shape. The beam passes through the guide rail in order to pass through a through hole for penetrating the guide rail in its extending direction and an edge along the insertion direction of the printed wiring board. A slit extending along the
The guide rail has a cross-sectional shape that is locked to the wall surface of the beam that forms the through hole at the position of at least one of the beams that supports both ends of the guide rail, and the guide rail rotates around its own axis. The shelf according to claim 1, wherein the shelf is configured to be prevented. It consists of a frame formed by a pair of side plates facing each other and a plurality of beams that bridge and connect the pair of side plates in the facing direction, and a plurality of printed wiring boards on which electronic components are mounted are arranged in parallel inside. A shelf for accommodating
A first guide rail group composed of a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting two adjacent sides of the frame body;
It comprises a plurality of guide rails arranged in parallel so as to bridge a pair of beams constituting the other two adjacent sides of the frame, and each guide rail is arranged opposite to each guide rail of the first guide rail group A second guide rail group configured to guide insertion of the printed wiring board by both guide rails;
With
The fan installed in the end opening on the first guide rail group side drives the outside air from the end opening on the second guide rail group side to cool the plurality of printed wiring boards. Configured to
The guide rail and the beam are each configured by standing a long plate material in the width direction and fixed to each other by cross-fitting through a slit provided in the width direction. A featured shelf.   The shelf according to claim 1, wherein at least a side surface of the beam facing the ventilation path is formed in a rounded curved shape. A first shelf and a second shelf that are arranged in close proximity to each other and house a plurality of printed wiring boards on which electronic components are mounted in parallel;
A fan that is installed at an end opening of the first shelf and forcibly ventilates the first shelf to cool the printed wiring board;
A discharge path installed between the fan and the second shelf, for discharging air discharged from the first shelf through the fan, and for passing outside air through the second shelf; A heat shielding plate that has a partition plate that obliquely partitions the introduction path, and is arranged to cover the fan;
With
The shelf structure, wherein the partition plate has a curved portion so as to protrude toward the second shelf.