JPS5928973B2 - Iron core tightening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Description of the Technical Field The present invention relates to a core tightening device for laminated cores in electrical equipment such as transformers and reactors.

(b) Description of the prior art Two methods of tightening a laminated iron core using a tightening band include a method of wrapping only the tightening band without using a tightening fitting or tightening device, and a tightening fitting that uses the tension of the bolt to tighten the tightening band. Alternatively, there is a method of tightening using a tightening device.

In the tightening method using only tightening bands, when assembling the core,
A device is required to compress the core in the stacking direction more than the tightening surface pressure required for core rigidity, resulting in poor assembly workability. In addition, in the tightening method using tightening fittings using bolts,
Because bolts and screw parts are used, the structure of the metal fittings themselves becomes larger, which reduces the space factor of the core, and requires the work of tightening bolts for each tightening band during the core assembly process. Workability deteriorates. Furthermore, since there are extra parts, there is a risk that eddy current will occur in these parts, causing loss. Therefore, a tightening device using a tightening fitting must be as compact as possible, have a large space factor for the core within the winding insulating cylinder, and be easy to assemble the core. .

(c) Purpose of the Invention The present invention takes the above-mentioned points into consideration, and improves the clamping fittings of the core clamping band, improves the space factor of the core, facilitates the assembly work of the core, and generates heat due to eddy current. The purpose of the present invention is to provide an iron core tightening device that can suppress the

(d) Structure of the Invention The present invention will be described below with reference to the embodiment shown in FIGS. 1a and 1b.

FIG. 1 shows a part of a core yoke 1 and a core rectangle 2 made of a laminated core.

A tightening band 3 made of glass fiber or the like is wrapped around the outer periphery of the locking leg 2, and tightening fittings 4 are attached to both ends of the tightening band 3.
is fixed to a backing plate 5 disposed on the outside of the iron core leg 2. Details of the fastening fitting 4 and the backing plate 5 are shown in FIGS. 2a and 2b. The patch plate 5 has windows 6 at the parts where both ends of the tightening band 3 are located.
is formed, and a protrusion 1 is formed on the outside of the periphery of this window 6 toward the inside of the window 6. On the other hand, the tightening fitting 4 has a backing plate 5.
The locking piece 8 is formed into a groove shape so as to engage with the protruding portion □, and has a claw portion Ba. Therefore, the tightening band 3 is wound around the outer periphery of the iron core rectangle 2, and the claws 8a of the locking pieces 8 of the tightening fitting 4 attached to both ends of the tightening band 3 are hooked to the protruding portion 7 of the backing plate 5 to be integrated. As a result, the tightening band 3 maintains the necessary tension and tightens the core leg 2. The tightening band is attached to the outer periphery of the iron core leg 2 only by engagement between the claw portion 8a and the protrusion portion 7. (e) Effect of the invention Since the elastic modulus in the circumferential direction of the core due to expansion and contraction in the core lamination direction is several times larger than that of the tightening band 3 using glass fiber,
Even if a slight elongation occurs in the tightening band 3, the tightening surface pressure of the iron core hardly changes.

Therefore, since the tightening band 3 is fixed to the backing plate 5 from a short state, even if the iron core shrinks in the stacking direction due to drying or aging, the tension of the tightening band 3 will be significantly reduced. There is no possibility that the joint between the fastening fitting 4 and the backing plate 5 will separate. With this configuration, the structure of the fastening fitting 4 is very simple, so it can be made as small as possible and the space factor of the core within the winding insulating cylinder can be maximized.

It also has the advantage of being extremely easy to assemble the core. Incidentally, the shape of the protrusion 7 formed at the periphery of the window 6 of the backing plate 5 is not limited to the above embodiment, but the shape of the protrusion 7 formed at the periphery of the window 6 of the backing plate 5 may be formed into a chevron shape, and a locking piece that fits into this chevron-shaped protrusion may be provided on the fastening metal fitting 4. may be formed.

Further, the window 6 of the backing plate 5 may be formed in the shape of a groove without being open. (f) Overall effect As mentioned above, in the present invention, the iron core is tightened from its outer periphery by simply locking the tightening fittings of the iron core tightening band on the backing plate, so the space factor of the iron core is improved. This has the effect of making it possible to manufacture a larger-capacity core, and greatly improving core assembly workability.

In addition, there is an effect that heat generation due to the whirlpool current is suppressed to a low level and loss is reduced.

[Brief explanation of drawings]

FIG. 1a is a front view showing the iron ′υ fixing device according to the present invention, FIG. 1b is a sectional view taken along the - line of FIG. Figure a is an enlarged front view of the main part, and Figure 2b is an enlarged sectional view of the main part of Figure 1b. DESCRIPTION OF SYMBOLS 1... Core yoke, 2... Core leg, 3... Tightening band, 4... Tightening metal fitting, 5... Core backing plate, 6...
...Plate window, 7...Protruding part, 8...Locking part.

Claims (1)

[Claims] 1. Wrap a tightening band around the outer periphery of the laminated core, with clamping metal fittings formed at both ends formed with locking pieces with claws, and arrange the claws of the locking pieces formed on the tightening metal fittings on the outside of the laminated iron core. An iron core tightening device characterized in that the tightening band is engaged with a window formed in a patch plate, and the tightening band is tightened around the outer periphery of the iron core only by the engagement between the claw portion and the window.