JPH0353457Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cooler attached to electrical equipment such as a power transformer or a reactor.

[Conventional technology]

Fig. 3 is a front view showing a conventional cooler attached to a reactor of this kind, for example, 1 is the cooler main body, 2 is a heat dissipation hoop made of a corrugated thin steel plate, and 3 is a rod-shaped hoop reinforcement. It is a member and is fixed to each hoop 2 by welding and extends.

[Problem that the invention attempts to solve]

When the cooler main body 1 receives vibration from the reactor side, this vibration is transmitted to the hoop 2, and a resonance phenomenon occurs in the hoop 2 whose natural frequency matches or is close to this vibration frequency.In order to prevent this, a rod-shaped member is used. 3 is provided.

However, in this configuration, the distance l between the hoop support points is fixed, so if it becomes necessary to change the natural frequency of the hoop 2 during a reactor installation test, etc., it is necessary to additionally fix a rod-shaped member. The problem was that it was a time-consuming and expensive improvement work.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a cooler that can easily adjust the natural frequency of the hoop and prevent the natural vibration of the hoop at a low cost. .

[Means to solve the problem]

The cooler of this invention is provided with a clamp member for adjusting the natural frequency characteristic of the hoop, which can be detachably attached to any location of the hoop. This clamp member consists of two hoop holding plates that sandwich the hoop in the width direction and bridge adjacent hoops, and a bolt/nut device that locally connects and restrains both hoops via both hoop holding plates. Become.

[Effect]

In this invention, by attaching and detaching the clamp member to and from the hoop, the hoop restraint points can be easily increased or decreased, and the position of the hoop restraint points can be changed, thereby making it possible to shift the hoop natural frequency as desired.

〔Example〕

FIG. 1 is a front view showing an embodiment of this invention, and reference numeral 4 denotes a clamp member for adjusting the natural frequency of the hoop, which has the structure shown in FIG. 2.

In FIG. 2, reference numerals 5 and 6 are hoop holding plates, which have a shape in which a pair of opposing sides have a length not smaller than the distance between adjacent hoops, and other opposing edges are mutually H-shaped. It is a slip stopper A that is bent in the same direction. 7 is a bolt installed in the center of the hoop holding plate 5, and 8 is a tightening nut. Holes are formed in the hoop presser plate 6 to allow bolts to pass therethrough.

This clamp member 4 is assembled by sandwiching the adjacent hoops 2, 2 in the width direction between the hoop press plates 5, 6, and rotating and tightening the tightening nut 7.
are bridged and fixed to adjacent hoops 2,2.

Adjacent hoops 2, 2 of this clamp member 4
The restraint points of the hoop 2 can be easily increased or decreased by attaching and detaching it to the hoop 2. Also, since the distance between the restraint points changes, the natural frequency of the hoop 2 changes, causing a resonance phenomenon. Vibration can be suppressed.

Since the clamp member of this embodiment is tightened and fixed using a bolt and nut device, it is easy to attach and detach. The resonance phenomenon described above may occur when a cooler is attached to an electrical device such as a reactor and the electrical device is operated.Adjustment of the natural frequency using the clamp member 4 Do this after observing the occurrence of the phenomenon.

In addition, in this embodiment, since the hoop holding plates 5 and 6 are tightened with bolts and nuts, both hoop holding plates 5 and 6 are bent in the direction in which their central portions approach each other, and the spring reaction force due to this bending causes both hoop holding plates 5 and 6 to be tightened with bolts and nuts. The V-shaped portions of the hoop presser plates 5 and 6 are pressed into contact with both hoops 2, and the nut 8 is prevented from loosening.

[Effect of idea]

As explained above, with this invention, by providing the hoop with a removable clamp member, the natural vibration of the hoop can be easily prevented at low cost.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of this invention, FIG. 2 is a front view of the clamp member in the above embodiment, and FIG. 3 is a front view of a conventional cooler. In the figure, 2... Hoop, 4... Clamp member, 5, 6... Hoop holding plate, 7... Bolt, 8
...Natsuto. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] For hoop natural frequency adjustment, it consists of two hoop holding plates that sandwich the hoop in the width direction and bridge adjacent hoops, and a bolt/nut device that locally connects and restrains both hoops via both hoop holding plates. 1. A cooler comprising a clamp member, the clamp member being detachable after the cooler is attached to an electrical device.