JP2007194242A - Cabinet for containing electrical and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cabinet for containing an electrical and electronic apparatus which can deal with strong and weak seismic waves broadly. <P>SOLUTION: Double layer structure of an outer cabinet and an inner cabinet is employed and a damping member 3 is arranged between them. The damping member 3 has a two layer laminate structure of viscoelastic bodies 9 and 11, and a stopper 14 touching the viscoelastic body 9 in a partial layer when a predetermined amplitude is exceeded is built in. Upon receiving a weak seismic wave, the damping member 3 displaces with a small sprint constant by the viscoelastic bodies 9 and 11 of two layers, and upon receiving a strong force by a strong seismic wave, the damping member 3 can absorb vibration of the inner cabinet 2 with a large spring constant by the viscoelastic body 11 of one layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cabinet for storing electrical and electronic equipment with improved seismic performance.

  Electrical and electronic equipment storage cabinets such as switchboards, distribution boards, and communication equipment storage boards house important lifelines such as power lines and communication lines inside them, so that internal equipment can be securely installed even in the event of an earthquake. A function to protect is required.

  Therefore, as shown in Patent Document 1, it has been proposed to suppress the maximum acceleration during an earthquake by interposing a damping member made of a viscoelastic body between the floor surface and the cabinet body. Patent Document 2 proposes a structure in which the cabinet has an internal / external double structure and a buffer member is provided between the cabinets to protect internal equipment.

  Although it is for a building, not for a cabinet, in Patent Document 3, a ring is brought into close contact with the outer periphery of a laminated rubber having a circular cross section, and the elastic deformation in the radial direction is restricted, thereby controlling the natural frequency of the building. A vibration damping device that can be adjusted to a corresponding spring constant has been proposed.

However, in the conventional structure described above, the spring constant of the vibration damping device after installation is constant. However, seismic waves are strong and weak, and if you set a large spring constant in preparation for a strong seismic wave, there will be little effect on weak seismic waves. Conversely, if you set a small spring constant, the amplitude will be excessive when you receive a strong seismic wave. The internal equipment may be destroyed. Especially for electrical and electronic equipment storage cabinets, there are various mounting conditions for internal equipment, and it is not rare to add internal equipment with a large mass after installation, so install a damping device with an optimal spring constant. It was also difficult.
JP 10-1332023 A Japanese National Patent Publication No. 11-501499 JP 2004-332869 A

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a cabinet for storing electrical and electronic equipment that can cope with a wide range of changes in equipment mounting conditions in the cabinet and the intensity of seismic waves. is there.

  The present invention, which has been made to solve the above-mentioned problems, is an electrical and electronic equipment storage cabinet provided with a vibration damping member made of a viscoelastic body, and the vibration damping member has a structure in which a plurality of viscoelastic bodies are laminated. And a stopper that contacts the viscoelastic body of a part of the layer when a predetermined amplitude is exceeded. In addition, it is preferable to set it as the structure where the contact surface with the viscoelastic body of a stopper was inclined, and it is preferable to set it as the structure which provided the double structure of the outer cabinet and the inner cabinet, and has arrange | positioned the damping member between them. .

  The cabinet for storing electrical and electronic equipment according to the present invention combines a damping member having a structure in which a plurality of viscoelastic bodies are stacked with a stopper that contacts a viscoelastic body of some layers when the amplitude exceeds a predetermined amplitude. It is a thing. For this reason, when the seismic wave is weak and the cabinet amplitude is small, the damping member itself is deformed with a relatively small spring constant to absorb the vibration. When a strong seismic wave is received and the amplitude of the cabinet becomes larger than a predetermined value, the stopper comes into contact with the viscoelastic body of some layers to increase the spring constant of the damping member, and absorbs vibration with a large spring constant. In this way, it is possible to deal widely with the strength of seismic waves with the same damping member. Also, the vibration characteristics of the cabinet change depending on the equipment mounting conditions, but since the spring constant increases when the specified amplitude is exceeded, the same vibration damping member can be used to change the equipment mounting conditions as described above. can do.

  In addition, if the contact surface of the stopper with the viscoelastic body is inclined as in claim 2, the inclined viscoelastic body and the stopper are smoothly contacted by strong vibration, and the impact of the contact is minimized. It can be suppressed to the limit. Furthermore, if it is set as the structure which has arrange | positioned the damping member between the outer cabinet and the inner cabinet like Claim 3, it is not necessary to incorporate a damping member at the time of field installation, and a special installation operation is not required.

  FIG. 1 is an overall perspective view showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a main part. The electrical and electronic equipment storage cabinet of this embodiment has a double structure including an outer cabinet 1 having a normal skeleton structure and an inner cabinet 2 provided therein. A vibration damping member 3 is disposed between them to protect the electric and electronic equipment housed in the inner cabinet 2 from vibration. The inner cabinet 2 in FIG. 1 has a structure in which equipment mounting rails 6 are attached to upper and lower rail mounting plates 4 via metal fittings 5, but the inner cabinet 2 can be variously modified as will be described later.

  3 is a perspective view of the damping member 3, and FIG. 4 is an exploded perspective view thereof. As shown in these drawings, the damping member 3 includes a lower plate 7, a lower mounting plate 8, a lower layer viscoelastic body 9, a middle plate 10, an upper layer viscoelastic body 11, an upper mounting plate 12, and an upper plate in order from the bottom. A plate 13 is laminated. The lower plate 7 is fixed to the outer cabinet 1 and the upper plate 13 is fixed to the rail mounting plate 4 of the inner cabinet 2. A commercially available viscoelastic rubber can be used as the viscoelastic bodies 9 and 11.

  The middle plate 10 projects outwardly larger than the viscoelastic bodies 9 and 11, and a stopper 14 having a shape as shown in FIG. The stopper 14 has an L-shaped cross section, and the distal end portion 15 is bent downward. The tip portion 15 is slightly separated from the lower plate 7 but extends to a position where it contacts the end portion of the lower mounting plate 8 when horizontally moved. An inner surface of the flat portion of the stopper 14 is an inclined surface 16. As shown in FIG. 6, the inclined surface 16 is at a position several mm away from the viscoelastic bodies 9 and 11, and the stopper 14 and the viscoelastic bodies 9 and 11 are not in contact with each other at normal times.

  In this embodiment, the damping member 3 is a quadrangle, and four stoppers 14 are fixed to the four sides of the middle plate 10. However, the stoppers 14 can be provided only on the two opposing sides of the middle plate 10. Alternatively, the damping member 3 can be a circular horizontal section, and a ring-shaped stopper can be used.

  Next, the effect | action of the damping member 3 is demonstrated using FIG. 6 and FIG. FIG. 6A shows a normal state, and the stopper 14 is not in contact with the viscoelastic bodies 9 and 11 as described above. FIG. 6B shows a state in which a weak seismic wave is received, and the stopper 14 is deformed without contacting the viscoelastic bodies 9 and 11 to absorb vibrations and protect the inner cabinet 2. If the single spring constant of each of the viscoelastic bodies 9 and 11 is k, the spring constant of the damping member 3 laminated in two layers is k / 2, and is greatly deformed by a small external force as shown in the graph of FIG. . As a result, vibrations of the inner cabinet 2 due to weak seismic waves can be quickly absorbed, and an accident in which the inner cabinet 2 is shaken before the viscoelastic bodies 9 and 11 are deformed to damage internal devices can be prevented.

  However, when a strong force is applied to the cabinet in response to a strong seismic wave, the amount of displacement of the inner cabinet 2 becomes too large as it is, causing a problem such as collision with the outer cabinet 1. However, in the present invention, when the viscoelastic bodies 9 and 11 exceed a predetermined amplitude, the stopper 14 starts to come into contact with the side surface of the lower layer viscoelastic body 9 as shown in FIG. The deformation of the body 9 is gradually restrained.

  As a result, the lower layer viscoelastic body 9 is gradually restrained, and only the upper layer viscoelastic body 11 is deformed. Since the spring constant is k, the spring constant of the entire damping member 3 is close to k as the stopper 14 starts to be contacted, and is close to the case where the force-displacement curve is one layer as shown in FIG. When a stronger force is applied, the tip 15 of the stopper 14 contacts the end of the lower mounting plate 8 as shown in FIG. 6D, and the lower layer viscoelastic body 9 cannot be further deformed. When this state is reached, displacement occurs only in the upper layer viscoelastic body 11, and the force-displacement curve further approaches one layer.

  Therefore, according to the present invention, when the damping member 3 receives a weak force due to a weak seismic wave, the damping member 3 is displaced with a small spring constant by the viscoelastic bodies 9 and 11 for two layers, and quickly absorbs the vibration of the inner cabinet 2. To do. When receiving a strong force from a strong seismic wave, the vibration of the inner cabinet 2 is absorbed by a large spring constant by the viscoelastic body 11 for one layer. Since the force for the allowable maximum displacement increases as the spring constant increases, the vibration of the inner cabinet 2 can be absorbed and the internal equipment can be protected even when a strong seismic wave is received.

  As described above, in the present invention, the stopper 14 comes into contact with the side surface of the lower layer viscoelastic body 9 when a predetermined amplitude is exceeded. The contact surface of the stopper 14 with the viscoelastic body 9 is defined as the inclined surface 16. If it puts in, both will contact smoothly and the impact of a contact can be suppressed to the minimum.

  In the above embodiment, the viscoelastic bodies 9 and 11 have two layers, but may have three or more layers. Instead of contacting the stopper 14 provided on the middle plate 10 with the lower layer viscoelastic body 9 when a predetermined amplitude is exceeded, the stopper 14 may be brought into contact with the upper layer viscoelastic body 11. In addition, an appropriate load supporting member that supports the vertical load can be combined with the damping member 3. In FIG. 1, the damping members 3 are arranged at four locations on the upper and lower sides of the inner cabinet 2, but the upper part is a general damping member without the stopper 14 on the lower side, or an elastic member such as rubber, It can also be connected with a wire or the like.

  In the embodiment described above, the inner cabinet 2 has a structure in which the device mounting rail 6 is attached to the upper and lower rail mounting plates 4 via the metal fittings 5. However, as shown in FIG. It is also possible to attach the rails 17 and attach the equipment mounting rails 6 to these auxiliary rails 17. With such a structure, the position adjustment of the device mounting rail 6 becomes easy. Further, as shown in FIG. 9, the rail mounting plate 4 can be formed into a frame shape, and the inner cabinet 2 can be formed into a box shape. Thus, various modifications are possible for the form of the inner cabinet 2.

1 is an overall perspective view showing an embodiment of the present invention. It is a disassembled perspective view of the principal part. It is a perspective view of a damping member. It is a disassembled perspective view of a damping member. It is a perspective view of a stopper simple substance. It is explanatory drawing of the operation state of a damping member. It is a graph which shows the relationship between the force and the displacement which a damping member receives. It is a perspective view which shows the modification of an inner cabinet. It is a perspective view which shows the other modification of an inner cabinet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer cabinet 2 Inner cabinet 3 Damping member 4 Rail mounting plate 5 Metal fitting 6 Equipment mounting rail 7 Lower plate 8 Lower mounting plate 9 Lower layer viscoelastic body 10 Middle plate 11 Upper layer viscoelastic body 12 Upper mounting plate 13 Upper plate 14 Stopper 15 Tip 16 Slope 17 Auxiliary rail

Claims (3)

  An electrical and electronic equipment storage cabinet provided with a damping member made of a viscoelastic body, wherein the damping member has a structure in which a plurality of viscoelastic bodies are stacked, and a part of the damping member exceeds a predetermined amplitude. A cabinet for storing electrical and electronic equipment, comprising a stopper that contacts the viscoelastic body of the layer.   The electrical / electronic equipment storage cabinet according to claim 1, wherein a contact surface of the stopper with the viscoelastic body is inclined.   The electric and electronic equipment storage cabinet according to claim 1 or 2, wherein a double structure of an outer cabinet and an inner cabinet is provided, and a vibration damping member is disposed between them.

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