JPH062787U - Electronic device cabinet cable hole structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cable hole structure for an electronic device cabinet that is capable of effectively suppressing the leakage and intrusion of radiation noise from the cable hole and is structurally simple and has good workability. In an electronic device cabinet having a flat opening or a cylindrical opening for pulling out a cable, this opening is divided by a flat partition plate 2 or a three-dimensional partition plate to form a small opening. It is designed to be formed. Further, instead of using the partition plate 2, a ferrite plate is placed along the inner wall surface in the cylindrical opening. The partition plates are made of a conductive material, and they are in contact with each other so that electrical conduction can be established. Further, the respective ferrite plates are placed so as to be in contact with each other. In this way, the cable hole is divided into a plurality of pieces or the inner wall surface of the opening is covered with a ferrite core.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cable hole structure in an electronic device cabinet.

[0002]

[Prior art]

 The electronic device cabinet is usually provided with a cable hole for pulling out an interface cable for connecting between devices forming a system or between a device and an end. Among electronic devices, communication devices have a large number of interface cables, so the shape of the cable hole is also large. From the viewpoint of suppressing the leakage of radiated noise from electronic devices or the intrusion of radiated noise from the outside, the cable hole (opening) should be as small as possible.

FIG. 3 is a perspective view showing a structure of a cable hole portion of a conventional cabinet. A cable hole 1a corresponding to the maximum number of interface cables of the device is provided on a predetermined surface of the cabinet 1. In the method of forming the cable holes 1a corresponding to the maximum number of such cables, radiation noise from the cable holes 1a and radiation noise that enters through the cable holes 1a are mostly reduced. You cannot do it. FIG. 4 is a perspective view showing the structure of another conventional cable hole portion. In order to reduce the opening area, a plurality of cable holes 1a are provided to divide and secure the required area.

[0004]

[Problems to be solved by the device]

 However, as shown in Fig. 4, the method of providing multiple cable holes to reduce the effective opening area and prepare for radiation noise leakage and intrusion increases the processing man-hours and deteriorates the workability of cable laying work. There was a point. In addition, when determining the opening area of the cable hole, the size must be determined in consideration of the maximum cable amount and the margin size that allows the connectors attached to the tip of the last cable to pass through. I have to. Therefore, when a plurality of cable holes are provided, each cable hole has an excess area, which is more wasteful than when a single cable hole is provided.

Therefore, even if a plurality of cable holes are provided as shown in FIG. 4, since the number is naturally limited and the area of each cable hole cannot be made so small, the effect of suppressing the radiation noise is reduced. It wasn't necessarily big. In addition, if the countermeasures for suppressing the radiated noise after the completion of the equipment were insufficient, it was difficult to reduce the number of individual cable holes and increase the number of cable holes as a subsequent measure.

From the viewpoint of reducing the opening area, a structure having a cylindrical opening as shown in FIG. 5 is also known. In this structure, a flange 4 is provided around the edge of the cable hole to form a waveguide as a tubular duct 5. However, when the cable hole has a duct structure, there is a problem that the workability is extremely poor because the cable has to be pulled out through the duct during the cable laying work. This decrease in workability is remarkable when handling cables with connectors attached.

Further, since the attenuation amount of radiation noise due to the duct structure, that is, the waveguide, is inversely proportional to the dimension in the longitudinal direction of the rectangular cable hole and proportional to the depth of the duct, the larger the cable hole, the more the duct becomes The depth will have to be deep. Therefore, there was a problem that the workability of the cable laying work declined accordingly. Furthermore, if the duct portion is deep, the mounting area of the cabinet internal unit becomes narrower.

FIG. 12 is a diagram showing another conventional cable hole structure provided as a countermeasure for suppressing radiation noise. When the cable is taken out from the cable hole 1d, the ferrite core 12 is attached to each cable, and the cable is taken out through this. However, the method using the ferrite core 12 as described above is not preferable in terms of workability and appearance. Also, it is difficult to select a ferrite core size that matches the thickness of the cable and the number of cables. Also, the workability of attaching a ferrite core to the cable was poor.

Especially for devices with many interfaces, large-sized ferrite cores are not available as commercial products unless a dedicated ferrite core is manufactured, and as a result, a large number of ferrite cores must be installed to handle them. There was a problem of disappearing. Therefore, the material cost and the cable wiring work cost have increased.

The present invention has been made in order to solve the above-mentioned problems, and can effectively suppress the leakage and intrusion of radiation noise from a cable hole, and it is structurally simple and has good workability. It aims to provide a good electronic equipment cable hole structure.

[0011]

[Means for Solving the Problems]

 The present invention is an electronic equipment cabinet having a flat opening or a cylindrical opening for pulling out a cable, and the opening is divided by a flat partition plate or a three-dimensional partition plate to form a small opening. Are formed. Further, instead of using a partition plate, a ferrite plate is placed along the inner wall surface in the cylindrical opening. The partition plates are made of a conductive material, and they are in contact with each other so that electrical conduction can be achieved. Also, the ferrite plates are placed so as to be in contact with each other. In this way, the cable hole is divided into multiple pieces or the inner wall surface of the opening is covered with a ferrite core.

[0012]

[Action]

 In this invention, the cable hole is divided into a plurality of small openings, so that the cable can be taken out easily. In addition, since each cable is pulled out from the small opening, the effect of suppressing radiation noise is increased. Further, when the structure using the ferrite plate is adopted, the duct structure for taking out the cable can be easily formed and the workability of the cable laying work can be improved.

[0013]

【Example】

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

FIG. 1 is a perspective view showing a structure of a cable hole portion of a cabinet showing a first embodiment of the present invention. FIG. 2 is a perspective view showing the detailed structure of the partition plate used in this embodiment.

In the present embodiment, the cable hole 1a is divided into a plurality of small holes in order to prevent the radiation noise from leaking and entering from the cable hole 1a provided in the electronic device cabinet 1. For this reason, a partition plate 2 having a plurality of partition pieces 2a as shown in FIG. 2 is attached to the cabinet 1 around the cable hole 1a with screws 3 or the like.

In this case, the partition plate 2 is made of a conductive material such as iron so that it can be electrically connected to the cabinet 1 when it is attached by the screw 3. In particular, if the cabinet 1 has been painted and the mounting portion 1b of the end face of the cable hole 1a to the partition plate 2 is in an insulated state, remove the paint in the area in contact with the partition plate 2. It is necessary to ensure that conduction can be established.

Further, it is desirable to provide a round hole 2c for screwing and a file for attaching and electrically connecting to the tip of the partition piece 2a of the partition plate 2. The larger the number of partition pieces 2a is, the smaller holes can be formed when the partition pieces 2a are attached to the cable hole 1a portion, and the noise radiation suppressing effect is enhanced accordingly. Further, by inserting the cable lashing notch 2b in the partition plate 2 as shown in the figure, the cable alignment and lashing can be easily performed when the cable is pulled out.

As described above, in the embodiment shown in FIGS. 1 and 2, since the detachable partition plate made of a conductive material such as an iron plate is attached to the cable hole portion of the cabinet, it is simpler than the conventional structure. The wiring work is greatly improved by the work of moving cables in and out of the cable hole with the largest opening area. In addition, the partition plate can be easily installed after the wiring work is completed, and the cable hole is made smaller after installation, so radiation noise can be effectively suppressed. If the number of holes is not sufficient, it is possible to increase the number of partition pieces and use another partition plate to achieve a smaller hole. Also, by providing a notch for cable lashing on the partition plate, it can also serve as a cable support, so that cable laying can be performed more reliably.

FIG. 6 is a perspective view showing a structure of a cable hole portion of a cabinet showing a second embodiment of the present invention. Further, FIG. 7 is a perspective view showing a detailed configuration of the duct constituent portion in the structure of FIG. An embodiment is shown in which the cable hole 1c has a duct structure in order to suppress leakage and intrusion of radiation noise from the cable hole 1c provided in the electronic device cabinet 1.

To form this duct structure, the flange 7 is attached to the cable hole 1c with screws 3 or the like. At the mounting portion, the flange 7 and the cabinet 1 are electrically connected to each other via the screw 3 or the like. In particular, when the electronic device cabinet 1 is applied with a coating treatment, as in the case of the first embodiment, the portion of the portion that comes into contact with the flange 7 is removed so that the electrical conduction is ensured. Further, the respective flanges 7 are also brought into contact with each other in the depth direction of the flanges 7 at the corners after attachment so that electrical conduction can be established.

The flange 7 is made of a conductive material such as an iron plate as in the partition plate 2 of the first embodiment. Further, in order to divide the cable hole 1c into a plurality of small openings to form a plurality of duct structures, a partition plate 8 made of an electrically conductive material such as an iron plate is inserted into the duct 10 formed by the flange 7. And place it. At this time, the dimension is set so that each end surface 8b of the partition plate 8 comes into contact with the flange 7 to establish electrical conduction.

The larger the number of partition pieces 8a attached to the partition plate 8, the more the cable hole can be formed in the small duct. In order to obtain the same shielding effect, the depth L of the duct can be made shallower as the front dimension of the duct becomes smaller. Therefore, it is preferable to increase the number of partition pieces 8a to divide the duct into small openings.

In the second embodiment, since the detachable flange and the partition plate made of a conductive material such as an iron plate are provided, it is not necessary to pass the cable through the deep duct as in the conventional case. Without cables, the work of putting in and out and the work of laying are greatly improved. In addition, the flange and partition plate can be easily attached after the cable installation work, and the small duct for the cable hole can be achieved, so that the effect of suppressing radiated noise is also increased. Furthermore, by making the duct smaller, the depth of the duct can be made shallower, which reduces pressure on the cabinet internal unit and eliminates wasted space. If the size of the duct is not sufficient, it is sufficient to increase the number of partition pieces, and it is possible to quickly prepare partition plates and flanges with a smaller size of duct.

FIG. 8 is a perspective view showing a structure of a cable hole portion of a cabinet showing a third embodiment of the present invention. FIG. 9 is a diagram showing a cross-sectional structure of the cable hole portion in FIG.

In the third embodiment, a flange 7 is provided around the edge of the cable hole 1 d in order to suppress leakage and intrusion of radiation noise from the cable hole 1 d provided in the cabinet 1, and a duct 10 structure is provided. Constitute. The structure of the duct 10 is the same as that of the second embodiment. At this time, electrical connection between the flange 7 and the cabinet 1 having the cable hole 1d is achieved as in the first and second embodiments. In order to suppress radiation noise from the interface cable, the ferrite core 9 is inserted along the inner wall surface of the duct 10.

FIGS. 10 and 11 are views showing a fourth embodiment of the present invention in which a ferrite plate is used instead of the ferrite core 9. The flanges 7a and 7b divided into a plurality of pieces are attached to the cable hole 1d with screws 3 or the like. At this time, it is the same as the previous example that the flanges 7a, 7b and the cabinet 1 are electrically connected to each other through the same bottom. It should be noted that the ferrite plate is not a conductive material, and when it is separated into plates, it is necessary to close them so that they come into contact with each other when mounting.

Further, the flanges 7a and 7b are also dimensioned so that the flange end surface 7e is in contact with the flange body surface 7d in the depth direction thereof so that electrical continuity can be established. Since the duct 10 is formed by attaching the flanges 7a and 7b, the ferrite plates 11a and 11b are inserted into the duct 10. The inserted ferrite plates 11a and 11b can also be brought into contact with each other at their respective end faces, and the periphery can be closed to provide the function as a ferrite core for suppressing radiation noise. At this time, if the end of the ferrite plate 11a is stepped 11c as shown in FIG. 11, a large contact area with the ferrite plate 11b can be secured, and the flanges 7a and 7b are prevented from falling off after the insertion and assembly. It is possible and no extra stop is required.

As described above, a flange made of a conductive material such as an iron plate is provided around the edge of the cable hole, a waveguide is formed as a duct structure, and then a ferrite core is mounted along the inner wall of the duct, which is conventionally used. In comparison, it is possible to greatly reduce the leakage and intrusion of radiation noise. In this case, the duct or waveguide acts as an attenuator for the radiation noise and suppresses the radiation noise. The amount of attenuation is a function of duct depth.

By adopting such a duct structure, it is not necessary to take measures in the internal circuit such as a package, which has been conventionally costly, and a simple and inexpensive cable hole structure can be realized. In addition, in the case of the third and fourth embodiments, the interface cable is taken out through the ferrite core mounted along the inner wall of the duct, so that the high frequency current that becomes a source of radiation noise conducted through the cable. Are removed by the ferrite core.

Therefore, as compared with the case where a plurality of ferrite cores are mounted as shown in FIG. 12 and countermeasures against them are taken, the appearance is neat and the difficulty of mounting the ferrite cores can be eliminated. As a result, the workability of cable laying work is improved, and the material cost and work cost are also reduced. Further, in the structure shown in FIG. 10 in which the flange and the ferrite core are divided into a plurality of pieces, after the cable laying work is completed, it is possible to attach the ferrite core to the cable hole portion of the cabinet to form a duct and easily attach the ferrite core. Therefore, the trouble of taking out the interface cable through the duct and the ferrite core is eliminated, and the workability of laying the cable can be further improved. Also, since each member of the ferrite core is a flat plate, cutting is relatively easy, and flexibility of cable hole size can be provided.

[0031]

[Effect of device]

 As described in detail based on the above embodiments, in the present invention, the opening for pulling out the cable is partitioned into a plurality of small openings or formed by a duct structure using a ferrite plate. There is an advantage that the installation work can be improved and the radiation noise can be effectively reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a cable hole portion of a cabinet showing a first embodiment of the present invention.

FIG. 2 is a detailed perspective view of a partition plate.

FIG. 3 is a perspective view of a cable hole portion of a cabinet showing a conventional example.

FIG. 4 is a perspective view of a cable hole portion of a cabinet showing a conventional example.

FIG. 5 is a perspective view of a cable hole portion of a cabinet showing a conventional example.

FIG. 6 is a perspective view of a cable hole portion of a cabinet showing a second embodiment of the present invention.

FIG. 7 is a detailed perspective view of a duct component.

FIG. 8 is a perspective view of a cable hole portion of a cabinet showing a third embodiment of the present invention.

FIG. 9 is a sectional view of a cable hole.

FIG. 10 is a perspective view of a cable hole portion of a cabinet showing a fourth embodiment of the present invention.

FIG. 11 is a partial detailed perspective view of a duct part and a ferrite core constituent member.

FIG. 12 is a perspective view of a cable hole portion of a cabinet showing a conventional example.

[Explanation of symbols]

 1 Cabinet 1a, 1c, 1d Cable hole 2 Partition plate 2a Partition piece 2b Cable lashing notch 7 Flange 8 Partition plate 8a Partition piece 9 Ferrite core 10 Duct 11a, 11b Ferrite plate

Claims (4)

[Scope of utility model registration request] 1. An electronic device cabinet having an opening for pulling out a cable, wherein a conductive partition plate for partitioning the opening into a plurality of small openings is electrically provided between the cabinet and the opening surface. A cable hole structure for electronic device cabinets, which is mounted detachably so as to establish continuity. 2. The cable hole structure for an electronic device cabinet according to claim 1, wherein a notch for securing a cable is provided at a desired position of each partition piece of the partition plate. 3. An electronic device cabinet having a tubular opening for pulling out a cable, characterized in that a ferrite plate is placed along an inner wall surface of the tubular opening. Hall structure. 4. An electronic device cabinet having a tubular opening for pulling out a cable, wherein a conductive partition plate for partitioning the tubular opening into a plurality of tubular small openings is provided inside the tube. A cable hole structure for an electronic device cabinet, which is detachably mounted so that electrical continuity can be established with the cabinet.