JPH06164179A - Shutter mechanism of shelf - Google Patents

Abstract

PURPOSE:To realize a shutter mechanism of shelf providing a function to making smooth the flow of cooled air. CONSTITUTION:A V-shaped blade 31-2a having a folding 32 at the center is provided as a shutter. A pushing bar is built into a guide rail 15. Under the condition that a printed circuit board assembly 1 is inserted, a blade 31-2a is formed in the shape of character V having a small opening angle by the pushing bar 50, opening a path 60 for the cooled air. Under the condition that the printed circuit board assembly 1 is removed, the blade 31-2a is restored by its elastic property to the condition having a large opening angle, maintaining the shape of the character V in order to shield the path 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shelf for active maintenance, and more particularly to a shutter mechanism provided in a passage of cooling air in the shelf.

[0002] In recent years, in electronic parts such as computers, active maintenance has been carried out to maintain the printed circuit board assembly while it is in operation in order to improve the operation efficiency.

Even if one printed circuit board assembly is removed for maintenance, the remaining printed circuit board assemblies that are still housed in the shelves are still energized and need to be cooled.

[0004]

2. Description of the Related Art The applicant of the present invention filed Japanese Patent Application No. 4-100905.
In the title of the invention, "Air-sealing structure of substrate storage shelf", when a printed circuit board covered with an air cover is inserted into the shelf, a ventilation hole through which cooling air flows is opened, and when the printed circuit board is removed, the ventilation hole is blocked. A shutter mechanism was proposed.

When the printed circuit board is removed, the vent hole of this portion is closed by the shutter, and the flow (leakage) of the cooling air into the space where the printed circuit board is removed is limited. As a result, the cooling air exclusively reaches the printed circuit board remaining in the shelf, and the printed circuit board in the energized state continues to be cooled.

As a result, active maintenance is normally performed.

[0007]

The shutter mechanism 7 described above is used.
In the configuration of 0, as shown by the chain double-dashed line in FIG. 2, the ventilation port is closed by a flat surface orthogonal to the direction in which the cooling air is sent.

Therefore, regarding the location of the shutter mechanism, the cooling air is not rectified and the resistance received is large. Therefore, the flow rate to the printed circuit board in the energized state is reduced accordingly.

As a result, there is a problem that the printed circuit board in the energized state may be heated due to insufficient cooling in some cases.

Therefore, it is an object of the present invention to provide a shelf shutter mechanism having a function of rectifying cooling air.

[0011]

According to a first aspect of the present invention, a printed circuit board is surrounded by a rectangular cylindrical protective cover to protect the periphery thereof, and a printed circuit board assembly having openings on the upper and lower sides is inserted therein. A printed circuit board assembly is provided on a shelf in which the printed circuit board assemblies are accommodated side by side. When the printed circuit board assembly is inserted, a passage for cooling air corresponding to the inserted printed circuit board assembly is formed. A shutter mechanism that opens and shuts off the passage when the printed circuit board assembly is removed, has a slender shape in the depth direction of the shelf, has a fold line at the center along the longitudinal direction, and has both sides of the fold line. A pair of blade parts of the V-shaped,
A blade, which is deformable in a direction in which the opening angle of the pair of blade portions changes, is provided at a lower portion of the passage, and in a state where the printed circuit board assembly is inserted, the blade is opened at the opening angle. When the printed circuit board assembly is removed, the blade has a folding and unfolding means for unfolding the blade so that the opening angle becomes large, and the blade is folded to open the passage. In addition, the passage is shielded in a state where the blade is deployed and still forms a V shape.

According to a second aspect of the present invention, the blade is configured such that the pair of blade portions can be elastically deformed in a direction in which the opening angle changes, and the folding and unfolding means has the tips of the pair of blade portions. And a supporting mechanism for supporting the printed circuit board assembly so that the printed circuit board assembly can be moved toward and away from each other, and the lower end of the printed circuit board assembly is abutted against the fold line. Then, it is pushed down by the printed circuit board assembly to press the folds to elastically deform the blade portion to reduce the opening angle, and when the printed circuit board assembly is removed, the pressing force is released and the blade is opened. The push rod is configured to allow elastic restoration in the direction in which the angle is large.

[0013]

The blade of claim 1 acts to open the passage and straighten the cooling air in the folded state.

In the expanded state, the blade shields the passage and is still V-shaped, and acts to straighten the cooling air.

The structure in which the blade of claim 2 is elastically deformable acts so that the elasticity of the blade itself can be used for deployment.

The construction in which the push rod is incorporated in the guide rail cooperates with the fact that the blade itself has elasticity,
The blade operates in conjunction with the removal of the printed circuit board assembly.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS For convenience of explanation, first, a printed circuit board assembly 1 will be described with reference to FIGS.

The printed circuit board assembly 1 includes a printed circuit board 2
IC components 3 are mounted on the front and back surfaces of the connector, a connector 4 is attached to the end of the printed board 2 in the insertion direction, and a protective cover 5 made of metal and surrounding the printed board and having a rectangular tubular shape is attached. is there.

5a is a front plate portion, 5b is a rear plate portion, 5c,
5d is a side plate part, respectively.

An opening 6 is provided on the lower surface side of the printed circuit board assembly 1.
There is also an opening 7 on the upper surface side.

The protective cover 5 protects the printed circuit board 2 and the IC component 3 mechanically and electrostatically with a cooling air passage secured.

Next, the shelf 10 will be described.

The shelf 10 comprises a back panel 11, left and right side plates 12 and 13, front opening / closing doors (not shown), and the like.

On the back panel 11, a plurality of connectors 14 are attached side by side.

Further, a plurality of pairs of guide rails are provided so as to extend forward from the back panel 11 and have the guide rails 15 and 16 as a pair.

The lower guide rail 15 includes a support beam 17,
18 is supported by the upper guide rail 16
Are supported by support beams 19 and 20.

Further, the shelf 10 is provided with an air blowing mechanism 21 for blowing the cooling air upward at the lower part and an air blowing mechanism 22 for sucking the cooling air at the upper part.

The above-mentioned printed circuit board assembly 1 is inserted in the X ₁ direction by fitting and guiding the upper and lower ends of the printed circuit board 2 into the guide rails 16 and 17 (FIG. 3 shows the insertion process).
The connector 4 is connected to the connector 14, and the shelf 10
It is stored inside.

Inside the shelf 10, left and right side plates 12, 1
Four printed circuit board assemblies 1 _-1 to 1 _-4 are housed side by side in close contact with each other without a gap.

Next, the shutter mechanism 3 forming the essential part of the present invention
0 will be described with reference to FIGS. 4 to 6.

FIG. 4 shows the blade 31. Blade 31
Has a fold 32 at the center in the width direction of the elongated rectangular metal plate. The blade portions 33 and 34 have an opening angle α ₁ close to 180 degrees, and the blade 31 is V-shaped with a large opening angle.

At both ends in the width direction of the blade 31, that is,
Long pins 35, 36 are attached to the tips of the blade parts 33, 34.
Is provided. The ends of the pins 35 and 36 slightly project from both upper ends of the blade 31 in the longitudinal direction.

One blade 31 is provided for each guide rail.

As shown in FIG. 1, a printed circuit board assembly 1
_The blade 31 _-2a corresponding to the lower guide rail 15 of the portion _{-2 in} which _-2 is accommodated has one end of the pins 34, 35 fitted into the long hole 37 formed in the support beam 17 in this longitudinal direction. In addition, the other ends of the pins 34 and 35 are fitted into the long holes (not shown) formed in the support beam 18 in the longitudinal direction, and the upper and lower sides in the longitudinal direction are supported. It is provided on the side part.

[0035] Also, the blade _31-2b corresponding to the upper guide rail 16 of the portion 38 of printed circuit board assembly 1 _-2 is accommodated also, as with the blade _31-2b, the pin length of the support beam 19, 20 It is supported by the hole and is supported on the upper side of the guide rail 16.

Other printed circuit board assemblies 1 _-1 , 1 _-3 , 1 _-4
There corresponding blade 31 _-1a in the portion of the guide rails 40 to 46 to be _{accommodated, 31 -1b, 31 -3a 31 -3b} , 31
_-4a, 31 _-4b is, the blade 31 _{-2a, 31-2b}
It is provided similarly to.

Further, the guide rail 15 is provided with push rods 50 as folding and unfolding means on the inlet side and the back side of the shelf 10.

The push rod 50 is shown in FIGS. 5 (B) and 6 (B).
As shown in FIG. 5, it is fitted in the hole 15 of the guide rail 15, is slidable in the Z ₁ and Z ₂ directions, and has an inclined portion 5 at the upper end.
0a, a wedge 50b at the lower end, and a stopper 50c in the middle. The wedge portion 50b is in contact with the fold 32.

[0039] In a state where the printed circuit board assembly 1 _-2 are accommodated is inserted into the receiving portion 37, as shown in FIG. 5 (A), (B) , the push rod 50, the guide rails of the printed circuit board 2 It is pushed by the lower end surface 2a fitted to 15 and pushed down in the direction of arrow Z ₁ .

As a result, the blade 31 _-2a is pushed under the crease 32 by the wedge portion 50b, the pins 35 and 36 are elastically folded toward each other, and is located right below the guide rail 15 and has an opening angle. α ₂ has a V-shape with an acute angle (see FIG. 4B), and the shutter is open.

As a result, the printed circuit board assembly 1
_-2 Passageway 60 for the cooling air to pass through (accommodation section 38)
Is open.

The upper blade 31 _-2a is also bent in an inverted V shape to open the shutter, and the upper passage 61 is opened.
Is also open.

[0043] Thus, the cooling air 65 in FIG. 5 (A) fed by the blower 21, as indicated by arrow 65 _-1, is supplied to the printed circuit board assembly 1 in _-2 PBA 1 It flows through the inside of _-2 and the IC component 3 is cooled.

The blade 31 _-2b is shown in FIG. 5 (A).
As shown in FIG. 7, the V-shaped portion is located upstream of the guide rail 15 in the direction of the flow of the cooling air, and has an arrow 65.
_As indicated by _-2 , it has a function of rectifying the cooling air supplied into the printed circuit board assembly 1.

Therefore, the flow resistance of the cooling air is reduced as compared with the case where the cooling air directly impinges on the guide rails 15 without the blade 31 _-2b , and a large amount of the cooling air is correspondingly generated. _-2 , the IC component 3 is cooled more efficiently.

Next, the case where the removal of the printed circuit board assembly 1 _-2 for maintenance.

[0047] When the printed circuit board assembly 1 _-2 is withdrawn,
The force pushing the push rod 50 downward is released. Blade 31
Is restored from the state of FIG. 4B to the state of FIG. 4A by its own elastic force.

At this time, the pins 35 and 36 move in the directions away from each other, and the push rod 50 is pushed up in the Z ₂ direction.

The upward movement of the push rod 50 is limited in a state where the stopper 50c is locked to the lower surface of the guide rail as shown in FIGS. 6 (A) and 6 (B). Restoration of the blade 31 is also limited with the upward movement of the push rod 50 being limited.

As shown in FIG. 6A, the pins 35 and 36 are
Adjacent printed circuit board assembly 1_-3, 1 _-1Oppose to
The blade 31 is moved to the position, and the blade 31 is in the state shown in FIG.
It spreads out to the left and right and is deployed, as shown in Fig. 6 (A).
Then, the passage 60 is shielded. This allows the shutter closed state
It becomes a state.

Even in this state, the blade 31 has an opening angle of α ₃ though it is an obtuse angle and forms a V shape.

Therefore, although the blade 31 is in the closed state, it still has the rectifying function.

[0053] Therefore, the cooling air impinging on the blade 31, in FIG. 6 (A), the bottom of which is rectified as indicated by arrow 65 _-3, the printed circuit board assembly of two neighboring steric 1 _-1 and 1 _-3 Guided to the side opening.

As a result, as compared with the shutter 70 which is flat as shown by the chain double-dashed line in FIG. 2, the flow resistance of the cooling air is smaller and the cooling air is efficiently supplied by the printed circuit board assembly which is energized. .

Therefore, even during maintenance, the printed circuit board assembly accommodated in the shelf and operating is kept sufficiently cooled, continues to operate normally, and the active maintenance work is normally performed.

The upper blade 31 _-1b is also in the same state as the above blade 31 _-1a, and shields the upper passage 61 of the accommodating portion 38.

As shown in FIG. 6B, the push rod 50 has a slanted portion 50a protruding from the guide rail. Therefore, when the printed circuit board assembly is inserted after the maintenance is completed, the push rod 50 is pushed down and the blade 30 is automatically folded to be in the open state shown in FIG.

The blades 31 _-1a and 31 _-1b are not limited to metals, but may be plastics, canvases or the like as long as they have elastic restoring force.

[0059]

As described above, according to the invention of claim 1, even during the active maintenance work (the state in which the shutter is closed), cooling air is applied to the printed circuit board assembly in operation as compared with the prior art. It can be sent efficiently, can reliably prevent overheating accidents, and can perform active maintenance work safely.

Even when the shutter is closed,
The flow path resistance of the cooling air can be made smaller than in the conventional case, and the printed circuit board assembly can be cooled more effectively than in the conventional case.

According to the second aspect of the invention, by utilizing the elasticity of the blade itself, the construction for expanding the blade can be realized with a simple structure.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a shutter mechanism of a shelf according to the present invention.

FIG. 2 is a front view of a shutter mechanism of the shelf shown in FIG.

FIG. 3 is a plan view of the shelf shown in FIG.

FIG. 4 is a perspective view showing the shape of the blade in the original state and the shutter opened / closed state.

FIG. 5 is a diagram showing a shutter open state.

FIG. 6 is a diagram showing a shutter closed state.

[Explanation of symbols]

1 Printed Circuit Board Assembly 2 Printed Circuit Board 3 IC Component 4 Connector 5 Protective Cover 5a Front Plate 5b Back Plate 5c, 5d Side Plate 6 Front Plate 7 Upper Opening 10 Shelf 11 Back Panel 12, 13 Side Plate 14 Connector 15, 16 Gaidoru 17,18,19,20 supporting beams 21 and 22 blowing mechanism 30 shutter mechanism 31 blade 32 folds 33 and 34 parts 50 push the blade portion 35, 36 the pin 37 elongated holes 38 PBA 1 _-2 are accommodated Bar 50a inclined part 50b wedge part 50c stopper 60,61 passage 65 cooling air 65 _-2 , 65 _-3 rectified cooling air

Claims (2)

[Claims] 1. A printed circuit board (2) is surrounded by a rectangular tubular protective cover (5) to protect its periphery, and a printed circuit board assembly (1) having openings (6, 7) on the upper and lower sides is inserted. A shelf (10) in which a plurality of the printed circuit board assemblies are adjacently arranged side by side is provided, and when the printed circuit board assemblies are inserted, cooling corresponding to the inserted printed circuit board assemblies is performed. A shutter mechanism that opens a passage (60) for passage of air and blocks the passage when the printed circuit board assembly is removed, the shutter mechanism being elongated in the depth direction of the shelf and extending along the longitudinal direction. Has a fold (32), and the pair of blades (33, 34) on both sides of the fold form a V-shape, and the pair of blades can be deformed in a direction in which the opening angle changes. The blade (31) above When the blade is folded at a position below the path (60) and the printed circuit board assembly is inserted so that the opening angle is small and the printed circuit board assembly is removed. A folding and unfolding means (37, 50) for unfolding the blade so that the opening angle becomes large, and the blade (31) is folded to form the passage (60).
The shack mechanism of the shelf characterized in that the passage (60) is shielded in a state in which the blade is opened and the blade is expanded to form a V shape. 2. The blade (31) is configured such that the pair of blade portions (33, 34) can be elastically deformed in a direction in which the opening angle changes, and the folding and unfolding means includes the pair of blades. A support mechanism (35, 36, 37) that supports the tip ends of the parts (33, 34) so that they can be moved closer to and away from each other, and a guide rail that guides the insertion of the printed circuit board assembly with the lower end in contact with the fold line. (15) When the printed circuit board assembly is inserted, the printed circuit board assembly is pushed down by the printed circuit board assembly to press the fold line and elastically deform the blade portion to reduce the opening angle. When the assembly is removed, the push-down force is released, and the blade is configured to include a push rod (50) that elastically restores in the direction in which the opening angle increases. The shutter mechanism for a shelf according to claim 1, wherein: