JPH07211554A - Vibrationproof supporting structure of winding iron core - Google Patents

Abstract

PURPOSE:To lower the noise level of a molded transformer by preventing the transmission of magnetostrictive vibration caused in an iron core to a frame. CONSTITUTION:A band for suspension is allowed to run from the lower face of a winding iron core and then pass through a through-hole 74 via both side faces of the iron core. Then, it comes above an upper frame and its both ends are connected with a connecting fitting 72. At the same time, necessary tension can be applied to the band for suspension. Since the winding iron core 1 is hanged down by the upper frame 31A via the band for suspension 71, a lower frame 32A receives only a small amount of weight. Therefore, vibration-free rubbers 56 of a small area can be used between the lower face of the iron core 1 and the lower frame 32A and thereby transmission of vibration from the iron core 1 to the lower frame 32A is remarkably reduced. By inserting vibration-free rubbers 54, 55 into spaces formed between the side face of a yoke section of the iron core 1 and the upper frame 31A and the lower frame 32A, the iron core 1 can be fixed flexibly and the transmission of vibration from the iron core 1 to the upper and the lower frame 31A, 32A is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a wound core adopted in a core of a molded transformer having a relatively small capacity,
In particular, the present invention relates to an antivibration support structure for a wound iron core for suppressing magnetostrictive vibrations generated in the wound iron core from being transmitted to another member such as a mold winding to amplify the vibration and increase noise.

[0002]

2. Description of the Related Art FIG. 3 is an elevational view of a molded transformer having a wound iron core. In this figure, a molded transformer is a three-phase three-legged winding core 1, a high-voltage winding and a low-voltage winding are integrally molded, and the three cores 11, 12 and 13 of the winding iron core 1 are wound around three cores. Mold windings 21, 22, 23 of this book, upper yoke 14 that magnetically connects the upper parts of core legs 11, 12, 13; lower yoke 15 that magnetically connects the lower part; upper yoke 14 It is composed of an upper frame 31 provided so as to cover the lower frame and a lower frame 32 provided so as to sandwich the lower yoke 15. The three mold windings 21, 22, and 23 are collectively referred to as the mold winding 2, and the upper and lower frames 31 and 32 are collectively referred to as the frame 3. In this figure, the mold winding 21
In a sectional view, the left half of the front portion of the frame 3 is cut away. The capacity of the molded transformer in which the wound iron core is used is a relatively small capacity of several 100 kVA.

The frame 3 is vertically connected by a connecting plate 33 and fixed and vertically tightened by bolts 331 and 332. Connection plate 33 as shown
Is a thin plate-like member that penetrates between the iron core leg 11 and the mold winding 21. The connecting plate 33 is also provided on the right side of the drawing, and the frame 3 is applied with a compressive force in a direction toward each other at both ends of the drawing. A plurality of coil receivers 41 are inserted and arranged between the mold winding 2 and the frame 3, and when the frame 3 is given a compressive force by the connecting plate 33, the mold winding 2 passes through the coil receivers 41. A compressive force is applied and fixed. A plurality of coil receivers 42 are also provided between the yokes 14 and 15 and the mold winding 2 to fix the positional relationship between the wound core 1 and the mold winding 3. The lower frame 32 is fixed to the base 6 via a vibration-proof rubber 53. Reference numerals 51 and 52 are also anti-vibration rubbers, which fix the vertical position of the frame 3 and the winding core 1 in the drawing. The vibration-proof rubbers 51 and 52 are used as the spacing pieces because the vibration of the iron core due to the well-known magnetostriction vibration is caused by the frame 3
This is to reduce the vibration noise of the entire molded transformer by making it difficult to transmit to the mold transformer. For the same reason, the coil retainers 41 and 42 are also made of an insulating material such as porcelain and a rubber plate.

FIG. 4 is a partial detailed view of FIG. 3 and its arrow A view, FIG. 4 (a) is a partial detailed view of the periphery of the connecting plate 33 of FIG. 3, and FIG. 4 (b) is its arrow A view. In addition to the figure, it is also a side view on the right side when the mold winding 21 of FIG. 3 is omitted. It should be noted that, of the members shown in FIG. 4, the same members as those in FIG.
In these figures, two steel plate bands 34 that surround the iron core leg 1 once are provided. As shown in FIG. 4 (b), the four corners of the connecting plate 33 are notched so that the band 34 can pass through the notches. Since the band 34 is tightened by a tightening member (not shown) and a large tension is applied, the winding core 1 and the connecting plate 33 are mechanically integrated as a result, and the winding core 1 is fixed in the left-right direction in FIG. become. However, since the connecting plate 33 is a thin plate, the winding iron core 1
The vibration in the left-right direction is absorbed by the bending of the connecting plate 33 and is difficult to be transmitted to the frame 3.

[0005]

By the way, the weight of the wound core 1 is received by the lower frame 32 via the vibration-proof rubber 53. The vibration-proof rubber 53 needs to have a large pressure-receiving area in order to withstand the weight of the wound iron core 1, and as a result, is configured to be spread over the entire area corresponding to the lower surface of the wound iron core 1. Therefore, there is a problem that the anti-vibration effect of the anti-vibration rubber 53 cannot be obtained as expected. Also the connecting plate
Since the band 33 firmly presses the winding 33 and the winding core 1, the vibration is transmitted from the winding core 1 to the connecting plate 33 without being damped. As described above, this vibration is partly absorbed by the bending of the connecting plate 33, but there is a problem that it is not sufficient as a vibration isolation effect.

An object of the present invention is to solve the above problems and to provide a vibration-proof support structure for a wound iron core which can suppress the transmission of magnetostrictive vibrations occurring in the iron core to the frame and the mold winding to reduce the noise level. To provide.

[0007]

In order to solve the above-mentioned problems, according to the present invention, at least two iron core legs and a yoke part connecting these iron core legs are provided, and an upper yoke part is provided. In a vibration-proof support structure for a wound core, which is provided with an upper frame for sandwiching and a lower frame for sandwiching a lower yoke part, a suspending band that circulates a portion of the winding core and the upper frame and suspends the winding core from the upper frame. Shall be provided.
Further, a hanging band is provided along the lower surface and the side surface of the wound core and the upper surface of the upper frame, and both ends thereof are connected by the connecting fittings on the upper surface of the upper frame to form one ring. Tension shall be given by the metal fittings. Further, it is assumed that two through holes are provided on the upper surface of the upper frame, and the hanging band is pulled out from the lower portion of the upper frame to the upper portion through the through holes. Further, it is assumed that a vibration isolating spacer is inserted between the wound core and the upper frame and the lower frame. Also, the anti-vibration spacing piece
Between the side faces on both sides of the upper frame that sandwich the upper yoke of the wound core and the faces of the upper yoke that face it, the side faces on both sides of the lower frame that sandwich the lower yoke of the wound core and the lower yoke that faces this And the bottom surface of the lower frame and the bottom surface of the lower frame. Further, it is assumed that the antivibration spacing piece is made of rubber.

[0008]

In the structure of the present invention, the weight of the winding core is reduced by the upper frame by providing the hanging band that circulates the winding core and a part of the upper frame and suspending the winding core by the upper frame. Since there is no need to receive it, there is no need to insert a large area anti-vibration rubber between them.

Further, a suspending band is provided along the lower surface and the side surface of the wound core and the upper surface of the upper frame, and both ends thereof are connected by a connecting fitting on the upper surface of the upper frame to form one round. By adopting a configuration that gives the hanging band sufficient tension to suspend the wound iron core with metal fittings,
Tension can be easily applied to the hanging band. In addition, when two through holes are provided on the upper surface of the upper frame, and the hanging band that goes upward from the side surface of the winding core through these through holes is pulled out from the lower portion to the upper portion of the upper frame, the upper frame is Even if the size of the winding core is larger, the position of the through hole is adjusted to the size of the winding core, so that the hanging band can be easily routed.

Further, by inserting a vibration-proof spacing piece made of an elastic material between the winding core and the upper frame and the lower frame, the positional relationship between them is flexibly fixed, and The transmission of the vibration of is suppressed. In addition, the spacing piece is placed between the side surfaces on both sides of the upper frame that sandwich the upper yoke of the winding core of the upper frame and the surfaces of the upper yoke opposite to this, and the lower frame that sandwiches the lower yoke of the winding core of the lower frame. It is possible to fix the position of the winding core in this direction by inserting it between the side surfaces on both sides of the winding and the surface of the lower yoke opposite to it, and it is provided between the lower surface of the winding core and the bottom surface of the lower frame. As a result, the vertical position of the mold winding can be fixed.

[0011]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is an elevational view including a partial cross-sectional view of a molded transformer showing an embodiment of the present invention, and the same members as those in FIG. 3 are designated by common reference numerals and detailed description thereof will be omitted. Further, FIG. 2 is a side view including a sectional view in which a part of the molded transformer of FIG. 1 is omitted. In these figures, it is not the connecting plate 33 as shown in FIG. 3 but the connecting pipes 35 provided on the left and right of FIG. 1 that fixedly support the upper frame 31A and the lower frame 32A constituting the frame 3A. The length of the frame 3A in the left-right direction in FIG. 1 is the length protruding from both ends of the mold winding 2, and the connecting pipe 35 is connected to this protruding portion.

The wound iron core 1 is suspended from the upper frame 31A by a suspending band 71. That is, the suspending band 71 is drawn from above the lower frame 31A through the through holes 74 provided in the upper portion of the upper frame 31A from the lower surface of the wound core 1 through the side surfaces on both sides, as shown by the thick line. Both ends are connected by the metal fitting 72 to form one ring. The weight of the wound iron core 1 is supported by the suspending band 74 and is supported in a floating state. Its weight is supported by the connecting pipe 35 via the upper frame 31A. Therefore, the force applied to the connecting pipe 35 is a compressive force. The connecting plate 33 in FIG. 3 is the opposite of being tensioned. Therefore, the cylindrical connecting pipe 35 is adopted as shown in the figure. However, since the mold winding 2 is supported by the frame 3 via the coil retainer 41, the upper frame 31A
A part of the weight of the wound core 1 is received by the coil retainer 41 and the mold winding 1. Therefore,
The mechanical strength and configuration of the connecting pipe 35 vary depending on the share of the weight of each. In addition to the structure in which the frame 3 is directly attached to the frame 3 by welding or the like as shown in the figure, a structure in which it is attached by a bolt can be naturally adopted.

An anti-vibration rubber 56 is inserted between the lower surface of the wound core 1 and the bottom surface of the lower frame 32A. This anti-vibration rubber 56
Is different from the vibration proof rubber 52 of FIG. 3 in that it does not receive the entire weight of the winding core 1 and the mold winding 2, but only for fixing the vertical position of the winding core 1, so the lower surface of the winding core 1 It suffices to insert it so that it hits a part of.
In the figure, it is inserted in two places on the left and right ends of the lower surface of the wound core 1.

As described above, since the vibration-proof rubber 56 has such a small cross-sectional area that it hits a part of the lower surface of the wound iron core 1, the vibration of the wound iron core 1 is difficult to be transmitted to the lower frame 32A and a good vibration-proof effect can be obtained. . Anti-vibration rubber 54 on the upper yoke 14
An anti-vibration rubber 55 is provided at 15 to fix the position of the wound core 1 in the left-right direction in FIG. In Figure 2, anti-vibration rubber 54,55
Is inserted into the gap between the winding core 1 and the frame 3A, but the tension of the suspending band 74 is adjusted so that the antivibration rubber 56 bears a part of the weight of the winding core 1. Since the horizontal movement of the winding iron core 1 in FIG. 2 can be suppressed,
Even if the anti-vibration rubbers 54 and 55 are omitted or provided, the wound core 1
Side or frame 3A side with a slight gap provided
It is also possible to adopt a configuration in which 5 does not come into direct contact with either one to further reduce the transmission of vibration of the wound iron core 1.

Although the detailed structure of the connecting metal fitting 72 is not mentioned, a steel plate band is used as a material capable of withstanding a large tension for the hanging band 74. There are commercially available metal fittings for connecting and applying tension, so that an appropriate one may be selected from them. Further, the anti-vibration rubbers 54, 55, 56 play the role of spacing pieces for ensuring a predetermined gap between the wound iron core 1 and the frame 3A, but these are made of anti-vibration rubber alone. Instead, it is also possible to use a laminated material of an insulating material and a vibration-proof rubber, which is less elastic than the vibration-proof rubber. In any case, the material is not limited to the vibration isolating rubber as long as it is a vibration isolating spacing piece that fulfills both functions of fixing the position of the wound core 1 and suppressing the transmission of vibration.

[0016]

As described above, according to the present invention, the weight of the winding iron core is reduced by adopting the structure in which the winding iron core and the hanging band that circulates a part of the upper frame are provided and the winding iron core is hung by the upper frame. Since there is no need for the lower frame to receive it, there is no need to insert a wide anti-vibration rubber between them, so the vibration transmission from the winding core to the lower frame is reduced and the vibration noise of the entire mold transformer can be reduced. The effect is obtained.

Further, a suspending band is provided along the side surface and the lower surface of the wound iron core and the upper surface of the upper frame, and both ends of the upper frame of the upper frame are connected by connecting metal fittings to form one round. By adopting a configuration in which the metal fitting provides sufficient tension for suspending the wound iron core, it is possible to obtain an effect that tension can be easily applied to the suspension band.

Further, if two through holes are provided on the upper surface of the upper frame and a hanging band extending upward from the side surface of the wound core through these through holes is drawn out from the lower part to the upper part of the upper frame, Even if the upper frame is larger than the size of the wound core, by adjusting the position of the through hole to the size of the wound core, it is possible to obtain an effect that the hanging band can be easily routed.

Further, by inserting a vibration-proof spacing piece made of an elastic material between the winding core and the upper frame and the lower frame, the positional relationship between them is flexibly fixed and the winding core is removed. It is possible to obtain the effect of suppressing the transmission of the vibration. Also, install the anti-vibration spacing piece between the side surfaces on both sides of the upper frame that sandwich the upper yoke of the winding core of the upper frame and the surfaces of the upper yoke opposite to this, and the lower yoke of the winding core of the lower frame. The position of the winding core in this direction can be fixed by inserting it between the side surfaces on both sides of the lower frame to be sandwiched and the surface of the lower yoke opposite to this, and the lower surface of the winding core and the bottom surface of the lower frame can be fixed. By providing the space between them, the vertical position of the mold winding can be fixed.

[Brief description of drawings]

FIG. 1 is an elevation view including a partial cross-sectional view of a molded transformer showing an embodiment of the present invention.

FIG. 2 is a side view including a cross-sectional view with a part of the molded transformer of FIG. 1 omitted.

FIG. 3 is an elevation view of a conventional mold transformer using a wound core.

FIG. 4 (a) is a partial detailed view of the molded transformer of FIG.
(b) is a view from arrow A in Fig. 4 (a)

[Explanation of symbols]

1 winding iron core 2 mold winding 3,3A frame 31,31A upper frame 32,32A lower frame 51,52,53,54,55,56 anti-vibration rubber (vibration isolation gap piece) 71 hanging band 72 for connection Metal fitting 74 Through hole

Claims (6)

[Claims] 1. A winding comprising at least two iron core leg portions and a yoke portion connecting these iron core leg portions, wherein an upper frame sandwiching the upper yoke portion and a lower frame sandwiching the lower yoke portion are provided. An anti-vibration support structure for a winding core, comprising: a vibration-supporting structure for the iron core; and a suspension band that circulates a part of the winding core and the upper frame and suspends the winding core from the upper frame. 2. A suspending band is provided along a lower surface and side surfaces of a wound iron core and an upper surface of an upper frame, and both ends thereof are connected to each other by a connecting fitting on the upper surface of the upper frame to form one ring. The vibration-proof support structure for a wound core according to claim 1, wherein tension is applied by the connecting fitting. 3. The upper frame is provided with two through holes on the upper surface thereof, and the hanging band is pulled out from the lower portion to the upper portion of the upper frame through the through holes. Anti-vibration support structure for the winding core. 4. A vibration-damping support structure for a wound iron core according to claim 1, wherein a vibration-proof spacing piece is inserted between the wound iron core and the upper frame and the lower frame. 5. A lower frame having a lower yoke of the winding core sandwiched between side surfaces on both sides of the upper frame having an upper yoke of the winding core sandwiched between the side surfaces of the upper yoke and the surfaces of the upper yoke opposite thereto. 5. The wound core according to claim 4, wherein the wound iron core is provided between the side surfaces on both sides of the lower yoke and the surface of the lower yoke opposite thereto, and between the lower surface of the wound iron core and the bottom surface of the lower frame. Anti-vibration support structure. 6. A vibration-damping support structure for a wound iron core according to claim 4, wherein the vibration-proof spacing piece is made of rubber.