JPH04266090A - Blocking plate for placing frame for mounting on casing - Google Patents

Abstract

PURPOSE:To provide a blocking plate for a placing frame of an inexpensive simple structure to be easily attached and detached from a front surface in the plate to be so mounted in the frame as to block a rear surface instead when a casing is vertically forcibly air-cooled upward and a circuit unit is not mounted, regarding the frame so mounted as to install the unit having a plurality of circuit packages therein and plugged in the rear surface, in the casing. CONSTITUTION:Fixing parts 5 formed by bending upper and lower edges of a placing frame 3 made by installing a bottom plate 32 and upper front and rear frames 34 at both side plates 31 for loosely holding the rear bent edge 35 of the plate 32 and the frame edge 36 of the frame 34, and grips elastically bent to be contracted in size for passing between the edged 35 and 36, are provided, or fittings molded integrally with the fixing parts and the grips are provided at the upper and lower edges.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a mounting frame in which a plurality of circuit packages are arranged side by side and a circuit unit, which is plug-in mounted on the rear side, is mounted on a device casing. , the case is forcedly air-cooled from the bottom upwards, and relates to a closing plate that is attached to cover the rear surface of the case when a circuit unit is not mounted.

With the miniaturization of circuit components, circuit configurations have also become more densely packaged and miniaturized, but at the same time, the amount of heat generated per device mounting volume has been increasing. For this reason, cooling is performed, and forced air cooling has become commonplace in case mounting devices. In this forced air cooling, it is necessary to ensure that the air flow path for cooling is not affected by the increase or decrease in the number of circuit units to be mounted.

0003

3 shows an example of a device using forced air cooling, (a) is a sectional side view of the housing, (b) is a perspective view of a circuit unit mounting frame, and FIG. 4 is a perspective view of an example of a conventional empty unit. be.

[0004] In general, for housing-type electronic devices, with emphasis on mounting efficiency and productivity, a circuit package is selected as a unit for mounting parts on a printed circuit board, configuring the circuit, connecting it to an external connector, and handling maintenance. , defines this dimension series and collective mounting method.

That is, as shown in FIG. 3(b), the circuit package 1 consists of printed circuit boards placed upright and closely arranged side by side at predetermined intervals (physical intervals determined by the height of the mounted components). It is mounted on the circuit unit 11 by making a plug-in connection to a connector. The width and depth dimensions of this circuit unit 11 match the internal mounting dimensions of the housing 2.
Therefore, as shown in FIG. 3(a), it can be efficiently mounted in the vertical direction in the casing 2. Thereby, the circuit package 1 is mounted inside the casing 2 in an orderly manner without waste.

[0006] In order to mount the circuit unit 11 in the casing 2, it is generally fixed directly to the casing frame, but for a casing 2 with a special structure or dimensions, it may be mounted as shown in FIG. 3(b). , the circuit unit 11 is a standard product and is mounted via the mounting frame 3.

[0007] This mounting frame 3 consists of a simple frame structure and a surface plate 37 that covers the front surface, and the circuit unit 11 of the housing 2
The circuit unit 11 is inserted and mounted from the front side, and is fixed to the mounting frame 3 with fixing screws from the front side.Furthermore, the surface plate 37 is fixed to the mounting frame 3.

The heat generated in the circuit package 1 is cooled by having all printed circuit boards arranged vertically at predetermined intervals, and the spaces partitioned by the printed circuit boards serving as air cooling channels, which are ventilated from the bottom to the top. However, in natural air cooling, for the circuit package 1 that generates a large amount of heat, cooling intervals such as making the adjacent spacing larger than the physical spacing or increasing the spacing from the circuit unit 11 mounted below are required. It has become necessary to establish one. If the number of circuit packages 1 mounted in the casing 2 is small, implementation can be done by reducing the mounting efficiency, but if it is necessary to increase the mounting efficiency, the first step is to perform forced air cooling using a fan, and then , liquid cooling, etc., which exhibits high cooling capacity, is used.

An example of this forced air cooling is as shown in FIG. 3(a), in which fan units 8 are disposed at the bottom and top of the housing 2, and outside air is sucked in at the bottom as shown by the arrow, and the circuit unit is heated. Feed from below 11, and connect circuit unit 1 at the top.
The warm air that has passed through casing 1 is sucked in and discharged to the outside of casing 2. Therefore, the circuit unit 11 mounted between the upper and lower fan units 8 is forcibly cooled by forced ventilation at a high speed from the bottom to the top. In this case, the rear surface of each circuit unit 11 is covered with a backboard made of a printed wiring board to form a wall, the front portion is covered with a front plate 37 and closed, both sides are covered with side plates, and the upper and lower surfaces are Ventilation holes are drilled on one side, so both side panels, backboard,
The top plates form a chimney connected in the vertical direction, forming a forced air flow path to ensure efficient cooling without leaks.

However, depending on the type and function of the device, some of the circuit units 11 may be unnecessary or may be left open for expansion. In this case, the chimney of the cooling channel is
At the non-mounted position of the circuit unit 11, the rear surface is opened without being blocked, and cooling air leaks from the opening, and the circuit unit 11 mounted above the circuit unit 11 cannot be cooled sufficiently. This must be prevented at all costs.

As a conventional example, an empty unit 9 shown in FIG. 4 has been used to close the rear opening caused by such non-mounting of the circuit unit 11. Empty unit 9
is a thin iron plate molded product that imitates the external shape of the circuit unit 11 as it is, and has a bottom plate 91 with a large ventilation hole 99 extending almost over the entire surface and bent opposite ends to form a side plate, and a bottom plate 91 with similar ventilation holes 99. A top plate 92 with a hole in one side and a back plate formed by bending one side at right angles is assembled into a box shape with ventilation holes 99 facing each other vertically, and a fixed bent plate with an elongated L-shaped cross section on the upper and lower front edges. Iron 93 is attached to the outside of the top and bottom.

When this empty unit 9 is inserted into the mounting frame 3 with the rear plate first and mounted, the fixed curved iron 93 comes into contact with the fixed position of the mounting frame 3 and is fixed with the fixing screw. In this state, the rear plate of the empty unit 9 performs the same function as the back board of the circuit unit 11, and the rear opening at the non-mounted position is closed. When the circuit unit 11 is to be mounted later, the empty unit 9 at the mounting position is removed and mounted.

[0013]

[Problem to be solved by the invention] However, ■
The empty unit 9 may have a luxurious structure as long as the plate portion (rear plate) corresponding to the backboard of the circuit unit 11 can be easily attached and detached. (2) Compared to its functions, the empty unit 9 is relatively expensive in terms of manufacturing, transportation, etc., and also requires a large storage space. There are other problems.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a mounting frame closing plate with a simple structure and low cost, which can be easily attached and detached from the front.

[0015]

[Means for Solving the Problems] As shown in FIGS. 1 and 2, the above object is to provide a circuit unit 11 in which a plurality of circuit packages 1 mounted on printed wiring boards are arranged side by side inside and plug-in mounted on the rear surface. Regarding the mounting frame 3 attached to the device casing 2, when the circuit unit 11 is not mounted, the casing 2 is forcedly cooled upward through the top and bottom, so that when the circuit unit 11 is not mounted, the rear surface is closed instead. A closing plate 4 is attached to the mounting frame 3 at the same time, and includes a bottom plate 32 and an upper front frame 33 on both side plates 31.
The upper and lower edges of the mounting frame 3 constructed by constructing the upper and rear frames 34 are bent so as to loosely sandwich the rear bent edges 35 of the bottom plate 32 and the frame edges 36 of the upper and rear frames 34. The fixed part 5 formed,
This is achieved by the housing-mounted mounting frame closing plate 4 of the first invention, which includes a handle portion 6 that is elastically curved and contracted to a dimension that passes between the rear bent edge 35 and the frame edge 36.

Furthermore, the rear bent edge 35 of the bottom plate 32 and the upper rear frame 34
The fixing part 51 loosely holds the frame edge 36 of the frame edge 36, and the rear bent edge 3
5 and a handle portion 61 that is elastically curved and retracted to a dimension passing between the frame edge 36 and a metal fitting 7 integrally formed on the upper and lower edges. Closing plate 41
It can also be applied by

[0017]

[Operation] That is, it is sufficient to provide a closing plate at the position of the backboard when the circuit unit 11 is mounted. In order to achieve this state, it is necessary to pass the board between the recessed edges, and it must be possible to do so from one side in front, but if the board is curved, it will pass in the chord direction. Since the dimensions of will shrink, it can be passed through, and after passing through, it may be made of an elastic plate to restore the original dimensions.
Handles 6 and 61 are provided to generate bending force for bending.

The closing plate 4 of the first invention, as shown in FIG.
It is an elastic plate having the same external shape as the backboard of the circuit unit, and the upper and lower edges are respectively folded back to form a fixing part 5.
This fixing part 5 can be inserted into the rear bent edge 35 or the frame edge 36 and held therebetween.

[0019] Also, a handle part 5 is provided on the front side with an interval above and below.
are arranged facing each other, and by pinching their tips and applying force in the approaching direction, they can be easily bent and the vertical dimension reduced. First, bend the fixed part 5 on the lower edge backwards. Edge 3
5, and while keeping one side clamped, apply force to the handle part 6 to force it backwards while bending it, and when the fixing part 5 on the upper edge reaches a position where it can clamp the frame edge 36, loosen it. When the fixing part 5 returns to its original state due to its elasticity, the fixing part 5 can be held, and the opening in between is closed by the closing plate 4 attached. To remove it, hold the handle part 6 and pull it downward and forward while applying force.The fixing part 5 on the upper edge will curve and come off, so you can loosen it and take it out.

The closing plate 41 of the second invention, as shown in FIG. 2, has a metal fitting 7 formed integrally with a fixing part 51 and a handle part 61, which are fixed to the front side so as to face each other vertically. In addition, the fixing part 51 can be clamped and fixed between the rear bent edge 35 and the frame edge 36, and at this time, a pushing force can be applied to the handle part 61 to curve it and push it in to clamp it.

Both of the closing plates 5 and 51 have a simple plate structure, unlike the box-shaped frame structure, and are superior to the conventional empty unit mentioned above in terms of productivity, cost, transportation, and storage. This will give you a much better profit.

[0022] Thus, it is possible to provide a mounting frame closing plate that is easy to attach and detach from the front and has a simple structure at low cost.

[0023]

EXAMPLES The present invention will be specifically explained below with reference to examples shown in the drawings. The same reference numerals indicate the same objects throughout the figures. FIG. 1 shows an embodiment of the first invention, (a) is a perspective view of the closure plate, (b) is a side view of the closure plate when it is bent, and FIG. 2 is a perspective view of the closure plate of the embodiment of the second invention. show.

Each of the present embodiments is applied to the forced air cooling device shown in FIG. 3, which was explained in the conventional example above, and a duplicate explanation of the applied device will be avoided with reference to FIG. , We will add a little more explanation to the parts related to the mounting frame 3 of the circuit unit 11.

As shown in FIG. 3(b), the mounting frame 3 is
Two side plates 31 whose front edges are bent to form fixing parts to the casing 2 are provided with a large ventilation hole 99 that covers almost the entire surface, and a bottom plate whose front edges are bent outward and the rear edges are bent inward. 32, an elongated upper front frame 33 having an L-shaped cross section, and an elongated upper rear frame 3 having a U-shaped cross section.
The backboard on the rear surface of the mounted circuit unit 11 is located just in front of the rear bent edge 35 of the bottom plate 32, and is located on one side of the upper rear frame 34 of the U-shaped cross section. It is also located just in front of the front frame edge 36.

[0026] Therefore, these edges 35 and 36 can be covered with flat plates that sandwich the upper and lower fixing parts. As shown in FIG. 1(a), the closing plate 4 of the first invention is a thin stainless steel plate with a thickness of 0.3 mm that has the same external shape (20 x 60 cm) as the backboard of the circuit unit 11 and is easy to bend elastically.
Fold the top and bottom edges (60cm sides) to the same side,
Furthermore, the end edge is folded back again with a predetermined gap and bent into a U-shape to form the fixed part 5, and the predetermined gap is suitable for inserting into the bent edge 35 or frame edge 36 and holding it. There is a gap, and the final edge 43 is the folded edge 4.
I set it lower than 2 so that I don't have to travel on business.

Furthermore, on the front side opposite to the side where the fixing part 5 is provided, a handle part 6 of an L-shaped metal fitting is placed at a distance of 10 cm vertically.
are placed facing each other, and the handle length is 5 cm. On this occasion,
It is important to weld the other side of the L-shaped metal fitting outward by 10cm so that it can easily be bent.Since this closing plate 4 is horizontally long, two sets of handles 6 are provided at 30cm intervals with center distribution. There is.

To install the closing plate 4, as shown in FIG. 1(b), hold the handle 6 and insert it from the front of the mounting frame 3, then bend the fixing part 5 on the lower edge of the bottom plate 32. By inserting it into the edge 35 and pinching it, and then pushing the handle part 6 downward and rearward while applying force and bending it, the vertical dimension is shortened and the edge 43 of the upper edge is aligned with the upper rear frame 34. It passes through the tip of the front frame edge 36 and stops when the folded edge 42 hits.
By loosening the force in this state, the curve returns to its original shape due to the elastic reaction force, and the vertical dimension also returns to its original shape, and the fixing part 5 is mounted with the frame edge 36 sandwiched therebetween.

To remove, pinch the handle part 6 and pull it downward and forward while applying force to curve it.The vertical dimension will be reduced.
The fixing part 5 on the upper edge comes off from the frame edge 36 and falls forward, so if you immediately relax and pull it out, the fixing part 5 on the lower edge will come off and be taken out without any resistance.

As shown in FIG. 2, the closing plate 41 of the second invention is made of a thin stainless steel plate with an outer diameter of 20 x 60 cm and a thickness of 0.3 mm, and is formed into an L-shape in which a fixing part 51 and a handle part 61 are integrated. The metal fittings 7 are vertically opposed and fixed by welding in the same manner as in the previous embodiment.

The metal fitting 7 has a handle portion 61 with a length of 5 cm on one side of the L-shape, and the tip of the other side is bent to form a fixed portion 51 with a predetermined distance from the welding surface. The rear bent edge 35 of the bottom plate 32 of the mounting frame and the frame edge 36 of the upper rear frame 34 are sandwiched between the gaps.

[0032] The edge of the fixing portion 51 protrudes from the edge of the plate and is fixed thereto to facilitate installation. In addition, since the closing plate 41 is a horizontally long thin plate and has no horizontal ribs, a 10 x 10 mm U-shaped bent groove 44 is provided at the horizontal center line of the plate so as to protrude on the same side as the metal fitting 7. There is.

The installation and removal of this closing plate 41 is the same as in the embodiment of the first invention, and will therefore be omitted. The above embodiment shows an example, and the shapes, dimensions, and materials of each part are not limited to those described above.

Although the fixing portion 5 of the closing plate 4 is provided over the entire length of the upper and lower edges, it is not limited to the entire length, but may be of a predetermined length, or may be partially shortened and provided at several locations. In addition, folds may be provided on the upper and lower edges of the closing plate 41 to make it easier to attach and increase the strength.The fixing portion 51 and the handle portion 61 may be made wider in the metal fitting 7, and one each may be provided on the upper and lower sides. No problem.

Note that the rear bent edge 35 and the frame edge 36 of the upper rear frame 34
If they are not on the same plane and there is a difference in level, it is sufficient to use a plate that is bent over the difference in level.Also, the bending groove 44 for reinforcing the horizontally long thin plate can be formed by changing the U-shape to a V-shape, and folding the U-shape into a V-shape. There is no problem with the shape, and a plurality of pieces may be provided in parallel as necessary.

[0036]

As described above, the present invention provides a mounting frame closing plate that is easy to attach and detach from the front, has a simple structure, reduces the number of man-hours for manufacturing, transportation, and installation work, and reduces costs. Does not require a large storage space and can be stacked,
The practical effects are significant.

[Brief explanation of the drawing]

[Fig. 1] Embodiment of the first invention (a) Perspective view of the closing plate (b) Side view of the closing plate when it is bent

[Figure 2] A perspective view of the closing plate of the embodiment of the second invention

[Figure 3]
An example of a device using forced air cooling (a) Cross-sectional view of the housing side
(b) Perspective view of circuit unit mounting frame

[Figure 4] A perspective view of an example of a conventional empty unit

[Explanation of symbols]

1 Circuit package 9 Empty unit
37 Surface plate 2 Housing 11
Circuit unit 42 Folded edge 3 Mounting frame 31 Side plate 43 Edge 4, 41 Closing plate 32, 9
1 Bottom plate 44 Bending grooves 5, 51 Fixed part 33
Upper front frame 92 Upper plates 6, 61 Handle portion 34
Upper and rear frames 93 Fixed bent iron 7 Metal fittings 35
Back bent edge 99 Ventilation hole

Claims (2)

[Claims] [Claim 1] A circuit unit (11) in which a plurality of circuit packages (1) mounted on printed wiring boards are arranged side by side and plug-in mounted on the rear surface is mounted on a device housing (2). Regarding the installed loading frame (3),
If the circuit unit (11) is not mounted because forced air is cooled upward through the housing (2), a closing plate (4) is attached to the mounting frame (3) to cover the rear surface instead. ), the mounting frame (3) is constructed by constructing a bottom plate (32), an upper front frame (33), and an upper rear frame (34) on both side plates (31), and the rear folding of the bottom plate (32) a fixing part (5) formed by bending the upper and lower edges so as to loosely sandwich the curved edge (35) and the frame edge (36) of the upper and rear frame (34);
A handle portion (6) that is elastically curved and compressed to a dimension that passes between the rear bent edge (35) and the frame edge (36). Closing board. 2. A fixing portion () that loosely holds the rear bent edge (35) of the bottom plate (32) and the frame edge (36) of the upper rear frame (34).
51), and a handle portion (61) that is elastically curved and contracted to a dimension passing between the rear bent edge (35) and the frame edge (36).
The closing plate for a mounting frame mounted on a housing according to claim 1, characterized in that metal fittings (7) integrally formed with are provided on the upper and lower edges.