JPS6118846B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an induction electric device such as a core transformer or a reactor.

A conventional induction electric appliance, for example, a core type transformer 1, has groove shaped steel on both sides of each core yoke 2 in order to tighten the upper and lower core yokes 2, as shown in FIGS. 1 and 2. A clamp 3 having a U-shaped cross section is provided, and a through hole 4 is bored in the core yoke 2.
This was accomplished by screwing a nut 6 onto the end of a bolt 5 that was inserted into the through hole 4 and passed through the clamp 3. In FIGS. 1 and 2, reference numeral 7 denotes a clamping plate interposed between both ends of the coil 8 and the upper and lower clamps 3, which is formed by punching an insulating plate into a ring shape. The upper and lower clamps 3 are integrally connected by a plurality of connecting bolts 9, and the flange of the upper clamp 3 is connected to the upper clamp through a disc-shaped insulating material 10 attached to the tip. Clamping plate 7
A plurality of pressing bolts 11 are screwed in to press the coil 8 by pressing. 8a is coil 8
This is the inside lead pulled out from the inside.

However, by drilling the through hole 4 in the core yoke 2, the magnetic flux density increases in the peripheral area due to a decrease in the cross-sectional area, which becomes a factor in increasing the core loss of the core type transformer 1. Ta. In addition, since the upper and lower core yokes 2 are made of laminated iron plates, in order to integrate them,
Clamps 3 are applied from both sides of the iron core yoke 2, and these clamps 3 are tightened together with bolts 5.Furthermore, since the bolts 5 are arranged at predetermined intervals, the bolts 5, 5 Since the tightening force acting on the laminated iron plate differs between the part where it is tightened and the approximately central part between the bolts 5 and 5, the problem is that the unbalanced tightening force on the laminated iron plate causes the laminated iron plate to vibrate and generate noise. There was a problem of insufficient rigidity of the clamp 3 due to this.

The present invention was made in view of the above-mentioned problems, and its purpose is to tighten each core yoke using a highly rigid and insulating clamping member without drilling holes in the core yoke. Therefore, iron loss,
The object of the present invention is to provide an induction electric appliance with reduced vibration and noise, and preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a partially omitted front view of a core type transformer 12, which is an example of an induction electric device according to the present invention. As shown in FIGS. 3 and 4, an insulating clamping member 14, which is longer and wider than the lower core yoke 13, extends horizontally. The clamping member 14 is made of resin concrete with a sufficient cross section to increase its rigidity, and inside thereof,
As shown in FIG. 5, reinforcing materials 15 made of reinforcing bars or glass fiber bars are embedded in a grid pattern. Further, near the upper and lower edges of the clamping member 14, a plurality of tubes 16 through which tightening bolts are inserted are horizontally embedded as described below, and one (upper in FIG. 5) edge is embedded horizontally as described below. It is formed slightly thinner than the other edge so that the coil lead can be easily pulled out. The tube 16 is buried near the end of the clamping member 14 and near the upper and lower edges between the core legs 17, and is fixed in a predetermined position by the reinforcing material 15 during manufacture. It is something that Further, the outer surface of the clamping member 14 is covered with an inorganic fiber sheet 18 such as a glass sheet that is spread when injecting the resin.
This sheet 18 is completely made into a reinforced plastic by leaching the resin, and prevents the surface of the holding member 14 from becoming powdery due to deterioration.

The lower core yoke 13 has clamping members 14 on both sides.
The upper and lower edges near the ends of the core legs 17 are tightened by the end tightening bolts 19, and the upper and lower edges between the core legs 17 are tightened by the inside-window tightening bolts 20 and the outside-window tightening bolts 21. has been done. That is, as shown in FIGS. 3 and 4, the end tightening bolt 19 is inserted into the tube 16 at the upper and lower edges near the end, and a nut 22 is attached to the clamping member at the end. 1
4 and are screwed together. In addition, the tube 16 at the upper edge between each core leg 17
As shown in FIGS. 6 and 7, a window tightening bolt 20 whose base is integrally attached via reinforcing plates 24 welded to both ends of the connecting plate 23 is inserted into the clamping member 14. A nut 25 is screwed into contact with the outer surface of the clamping member 14 at the tip of the window internal tightening bolt 20 protruding from the window. Note that an insulating material 26 is interposed between the connection plate 23 and the lower core yoke 13. Further, the outside window tightening bolt 21 is the end tightening bolt 19.
It is inserted into the tube 16 in the same way, and
At its end, a nut 27 is screwed into contact with the outer surface of the clamping member 14, but if the width of the clamping member 14 with respect to the lower core yoke 13 is small, it may be difficult to tighten the bolt inside the window. Similarly to the bolts 20, they may be connected by connecting plates.

A coil 29 from which an appropriate number of lead leads 28 are drawn out is fitted into each of the core legs 17,
A ring-shaped insulating plate 30 is interposed between the coil 29 and the clamping members 14 on both sides. The lower surface of the insulating plate 30 protruding from the clamping member 14 is supported by a plurality of supports 31 appropriately attached to the clamping member 14. On both sides of the upper core yoke 32, the above-mentioned clamping members 1 are attached.
A clamping member 33 configured in substantially the same manner as 4 is provided, and the upper and lower edges near the end of the clamping member 33 are secured by an end tightening bolt 34 and a nut 35.
Tighten the upper and lower edges between each core leg 17 with the window inner tightening bolts 36 and nuts 37 and the window outer tightening bolts 3.
8 and nuts 39, the upper core yoke 32 is firmly tightened. The upper and lower holding members 1
A plurality of connecting bolts 40 in the vertical direction pass through the body portions 4 and 33, and nuts 41 that abut on the respective clamping members 14 and 33 are screwed into the outer ends of the connecting bolts 40. It has been done. In addition, the connecting bolt 40
is inserted into a vertical tube (not shown) embedded near the end of each clamping member 14, 33 and between each coil 29. As shown in FIG. 3, a plurality of pressing bolts 42 extending in the vertical direction are inserted through the upper clamping member 33. As shown in FIG. Each pressing bolt 42 is screwed into a female threaded tube (not shown) embedded in the clamping member 33, and a ring-shaped insulating plate 43 on which the coil 29 is placed is connected to the lower end of the female threaded tube (not shown). A disc-shaped insulating material 44 to be pressed is integrally attached.

Note that a plurality of supports 45 attached to the upper clamping member 33 are in contact with the upper surface of the insulating plate 43 .

As described above, in the present invention, insulating clamping members are disposed at both ends of an iron core yoke, and the upper and lower edges of the clamping members are tightened with a plurality of fasteners. Even if the spatial leakage magnetic flux crosses, no circulating current will flow, and an increase in local loss can be prevented. Further, since the joint between the core yoke and the core leg can be tightened without drilling holes, iron loss can be reduced.
Furthermore, since the clamping member includes a reinforcing material therein, it has sufficient rigidity when the clamping member is tightened.
No damage or lack of tightening pressure.
Furthermore, the clamping member is made thinner on the coil side, making it easier to lead out the lead wire, and the rigidity can be increased by using reinforcing materials, tubes, and sheets to compensate for the lack of strength caused by making the coil side thinner. Therefore, the clamping member as a whole has excellent insulation properties and rigidity, and has remarkable effects such as reducing vibration and noise, and reducing iron loss at the same time.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
2 are a partially cutaway front view and a side view of a conventional induction electric appliance, respectively, and FIGS. 3 and 4 are a partially cutaway front view and side view of an induction electric appliance according to the present invention. FIG. 5 is an enlarged cross-sectional view of the main part, FIG. 6 is an enlarged cross-sectional view taken along the - line in FIG. 3, and FIG. 7 is a plan view thereof. 13... Lower core yoke, 14... Clamping member, 1
5... Reinforcement material, 16... Tube, 18... Sheet, 32... Upper core yoke, 33... Clamping member.

Claims (1)

[Claims] 1. In an induction electric appliance in which insulating clamping members 14 and 33 are arranged on both sides of iron core yokes 13 and 32, respectively, and these are connected to each other by a plurality of tightening members,
The clamping members 14, 33 are made of resin concrete with a reinforcing material 15 embedded therein, and the outer surface thereof is covered with an inorganic fiber sheet 18 impregnated with resin, and the coil 29 side of the clamping members 14, 33 is An induction electric appliance characterized in that an edge portion of the inductor is formed to be thinner than other portions, and a tube 16 through which the tightening member passes is embedded.