JP2019036570A - Outer iron type stationary induction machine and manufacturing method thereof - Google Patents

Abstract

To suppress the distortion of a leg of a wound core without applying local stress to the wound core and improve and stabilize the deterioration of the magnetic characteristics and the noise of the wound core.SOLUTION: In an outer iron type stationary induction machine 1 including a plurality of adjacent wound iron cores 4 and a coil 2 inserted into the wound iron core 4, an elastic member 3 having insulation is provided between the exterior of the coil 2 and the inner circumferential side of a leg 4a of the wound iron core 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a static induction electric device such as a transformer or a reactor.

  In a static induction machine such as a transformer, distortion of the iron core increases iron loss and generated noise. For this reason, conventionally, when assembling a transformer having an outer iron type structure, a press board in which paper is compressed is inserted between the coil exterior and the core leg in order to suppress distortion of the core leg.

  Patent Document 1 states that, in an outer iron-type wound core transformer in which an iron core cut for insertion into a coil is assembled into a coil and then fastened with an iron core fastening band, the outermost coil surface facing the iron core The outer iron-type wound core transformer in which inclusions are wrapped and fixed with the outermost insulating paper of the coil and the finished coil thickness is matched to the core design window dimensions. (Scope of claim for registration of utility model) ing.

Japanese Utility Model Publication No. 61-12655

  When assembling the transformer, the press board is inserted after the core wrap and band tightening work. There is an error in the production of the coil and the iron core, and the distortion of the iron leg cannot be removed only by tightening the band. Therefore, press board insertion work is indispensable. However, the press board insertion work takes a lot of man-hours for the adjustment and relies heavily on the skill of the operator. Moreover, local stress is applied to the iron core by inserting the press board.

  An object of the present invention is to suppress distortion of leg portions of a wound core without applying local stress to the wound core, and to improve / stabilize deterioration of magnetic characteristics and noise of the wound core.

  In order to solve the above problems, the present invention suppresses distortion without applying local stress by applying an elastic member such as rubber to the innermost circumference of the core in advance and performing an iron core wrap and band tightening operation. Eliminate adjustment work.

If you give an example of the “coating-type static induction electric appliance” of the present invention,
An outer iron type static induction electric machine comprising a plurality of adjacent wound iron cores and a coil inserted into the wound iron core, and has an insulating property between the exterior of the coil and the inner peripheral side of the leg of the wound iron core An elastic member is arranged.

In addition, if an example of the “method for manufacturing an outer iron type static induction appliance” of the present invention is given,
A method of manufacturing an outer iron type static induction electric appliance comprising a plurality of adjacent wound cores and a coil inserted into the wound core, wherein an insulating elastic member is attached to the core leg of the wound core that is open on one side Alternatively, an insulating elastic member is affixed to the exterior of the coil, and the wound core is inserted into the coil, and the insulating elastic member is disposed between the exterior of the coil and the leg of the wound core. A step of performing a lapping operation for closing the wound iron core, and a step of tightening an outer periphery of the wound iron core with a band.

  ADVANTAGE OF THE INVENTION According to this invention, distortion of the leg part of a wound iron core can be suppressed, without applying a local stress to a wound iron core, and the deterioration of the magnetic characteristic and noise of a wound iron core can be improved and stabilized. In addition, adjustment work during assembly of the transformer can be eliminated, and the number of assembly steps can be reduced.

It is a figure which shows an example of a shell type transformer. It is a figure which shows an example of the outer iron type transformer of Example 1. FIG. It is a figure which shows an example of the manufacture procedure of the outer iron type transformer of Example 1. FIG. It is a figure which shows an example of the outer iron type transformer of Example 2. FIG. It is a figure which shows an example of the outer iron type transformer of Example 3. FIG. It is a figure which shows an example of the outer iron type transformer of Example 4. FIG. It is a figure which shows an example of the outer iron type transformer of Example 5. FIG.

Before describing an embodiment of the present invention, the structure of a general outer iron type transformer will be described.
FIG. 1 shows an example of a shell-type transformer 1. The outer iron type transformer is an iron core that is a magnetic circuit around a coil (winding). The coil is surrounded by a plurality of iron cores, the coil is on the inside, and the outside is surrounded by the iron core. Yes. FIG. 1 is an example of a single-phase outer iron type transformer. The coil 2 has a magnetic circuit surrounding the coil 2 by inserting two wound iron cores 4 adjacent to each other. The coil 2 is configured by winding a primary coil and a secondary coil. The wound iron core 4 is configured by laminating electromagnetic steel plates or amorphous ribbons. A band 5 such as a steel band for fastening the wound core is wound around the outer periphery of the wound core 4. A space (gap) 8 is provided between the exterior of the coil 2 and the inner peripheral side of the leg portion of the wound core 4.

  When the transformer is operated, the wound iron core 4 distorts and vibrates, generating noise. Therefore, for example, a press board is inserted between the coil exterior and the core leg in order to suppress distortion of the core leg, but there is a problem in the insertion work.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that, in the drawings for explaining the embodiments, the same constituent elements are given the same names and symbols as much as possible, and the repeated explanation thereof is omitted.

  FIG. 2 shows an example of the outer iron type transformer according to the first embodiment of the present invention. Example 1 arrange | positions elastic members, such as rubber | gum, between a coil exterior and an iron core leg part.

  The outer iron type transformer 1 of the present embodiment has a coil 2, two wound cores 4 that are inserted into the coil 2 and surround the coil 2, and a band 5 that is wound around the outer periphery of the wound core 4 and fastens the wound core 4. And rubber 3 which is an elastic member is provided between the coil exterior and the leg part of the wound core. The rubber 3 is disposed over substantially the entire axial length of the coil 2. As the rubber, for example, oil resistant nitrile rubber (oil resistant NBR) can be used.

  In assembling the outer iron type transformer, when inserting the wound iron core into the coil, rubber is affixed in advance to the innermost circumference of the iron core leg. Insert the iron core into the coil, wrap the iron core, and tighten the iron core with a band. FIG. 3 shows this manufacturing procedure. As shown in FIG. 3A, a plate-like rubber 3 is affixed to the inside of the core leg of the wound core 4 that is open on one side. The rubber 3 may be attached using an adhesive tape such as a double-sided tape or an adhesive. Next, as shown in FIG. 3B, the wound iron core 4 is inserted into the coil 2, the rubber 3 is disposed between the exterior of the coil 2 and the legs of the wound iron core 4, and the wound iron core 4 is closed. Do lap work. Then, as shown in FIG. 3 (c), the wound iron core 4 that has finished the lapping work is fastened and fixed with the band 5 together with the rubber 3.

  In FIG. 3, the plate-like rubber 3 is attached to the inside of the core leg of the wound iron core 4, but the plate-like rubber 3 may be attached to the exterior of the coil 2.

  The rubber 3 is disposed between the exterior of the coil 2 and the inner peripheral side of the iron core leg, and the iron core leg and the coil 2 support each other via the rubber 3 by the rubber 3 being crushed by the band tightening operation. . The elastic rubber 3 suppresses distortion of the leg portion without applying local stress to the wound iron core 4.

  According to the present embodiment, by disposing an elastic member such as rubber between the coil sheath and the core leg, distortion of the wound core is suppressed without applying local stress to the wound core, and the magnetic characteristics of the wound core are deteriorated. And noise can be improved and stabilized. In addition, adjustment work during assembly of the transformer can be eliminated, and the number of assembly steps can be reduced.

  FIG. 4 shows an example of the outer iron type transformer according to the second embodiment of the present invention. In Example 2, two elastic members such as rubber disposed between the coil exterior and the core leg are stacked.

  As shown in the figure, the elastic member disposed between the coil exterior and the core leg is composed of a first rubber 3a on the core leg side and a second rubber 3b on the coil side. The first rubber 3a is disposed over substantially the entire length of the coil 2 in the axial direction. On the other hand, the second rubber 3b has a length shorter than the overall length of the coil 2 in the axial direction, and is disposed at the central portion of the coil 2 in the axial direction, that is, at the central portion of the iron core leg portion 4a. Yes.

  In the rectangular wound iron core 4 as shown in the figure, the central portion of the iron core leg portion 4a is easily spread laterally. Therefore, the gap can be eliminated by overlapping the second rubber 3b on the central portion of the iron core leg portion 4a, that is, the central portion in the axial direction of the coil 2 to increase the thickness of the elastic member. And since the elastic member is thin only by the 1st rubber | gum 3a in the upper end part and the lower end part of the coil 2, when the wound iron core 4 is clamp | tightened with the band 5, it becomes a clearance of rubber | gum.

  In the manufacture of the outer iron type transformer of the present embodiment, the first rubber 3a and the second rubber 3b may be overlapped and attached to the inside of the iron core leg portion 4a, and inserted into the coil 2, Alternatively, the first rubber 3a may be affixed to the inside of the core leg 4a, the second rubber 3b may be affixed to the exterior of the coil 2, inserted into the coil 2, and overlapped.

  FIG. 5 shows an example of the outer iron type transformer according to the third embodiment of the present invention. The third embodiment is obtained by dividing the second rubber 3b in the axial direction of the coil in the outer iron type transformer of the second embodiment.

  As shown in the figure, the elastic member disposed between the coil exterior and the core leg is composed of a first rubber 3a on the core leg side and a second rubber 3b on the coil side. The first rubber 3a is disposed over substantially the entire length of the coil 2 in the axial direction. On the other hand, the second rubber 3b has a length shorter than the overall length of the coil 2 in the axial direction, and a plurality of the second rubbers 3b are arranged at intervals in the axial direction of the coil 2.

  In the outer iron type transformer of the present embodiment, a plurality of second rubbers 3b are arranged at intervals in the axial direction of the coil, so that a gap is formed between the second rubbers 2b. Therefore, when the outer iron type transformer is an oil-filled transformer, heat can be transmitted to the oil that has entered the gap, and heat dissipation is improved. Also, in the case of a molded transformer that does not use oil, heat can be transferred to the air that has entered the gap, and similarly, heat dissipation is improved.

  FIG. 6 shows an example of the outer iron type transformer according to the fourth embodiment of the present invention. The fourth embodiment is obtained by dividing the rubber 3 in the axial direction of the coil in the outer iron type transformer of the first embodiment.

  As shown in the drawing, the elastic member disposed between the coil exterior and the iron core leg portion is constituted by a plurality of divided rubbers 3c. The rubber 3 c has a length that is shorter than the overall length of the coil 2 in the axial direction, and a plurality of the rubbers 3 c are arranged at intervals in the axial direction of the coil 2.

  In the outer iron type transformer of the present embodiment, since a plurality of rubbers 3c are arranged at intervals in the axial direction of the coil, a gap is formed between the rubbers 3c. Therefore, when the outer iron type transformer is an oil-filled transformer, heat is transmitted to the oil that has entered the gap, and the heat flows, so that the heat radiation is improved. In the case of a molded transformer that does not use oil, heat is transferred to the air that has entered the gap, and the air flows, so that the heat dissipation is also improved.

  FIG. 7 shows an example of a shell-type transformer according to the fifth embodiment of the present invention. In the outer iron type transformer of the first embodiment, the fifth embodiment uses rubber with a hole as an elastic member provided between the coil exterior and the legs of the wound core.

  As shown in the figure, the elastic member disposed between the coil exterior and the core leg is composed of rubber 3d having a plurality of holes.

  In the outer iron type transformer of the present embodiment, the rubber 3d has a plurality of holes. Therefore, when the outer iron type transformer is an oil-filled transformer, heat is transmitted to the oil that has entered the hole, and the heat flows, so that the heat radiation is improved. Also, in the case of a molded transformer that does not use oil, heat is transferred to the air that has entered the hole, and the air flows, so that heat radiation is similarly improved.

  In each of the above embodiments, a single-phase transformer has been described as an example. However, the present invention can be used for a three-phase transformer, and can also be used for a stationary induction device such as a reactor device.

DESCRIPTION OF SYMBOLS 1 ... Outer iron type transformer 2 ... Coil 3 ... Rubber | gum 3a ... 1st rubber | gum 3b ... 2nd rubber | gum 3c ... Divided rubber 3d ... Perforated rubber | gum 4 ... Winding iron core 4a ... Iron core leg | leg part 5 ... Band 8 ... Space ( gap)
9 ... hole

Claims (14)

A plurality of adjacent wound iron cores, and an outer iron type static induction electric appliance comprising a coil inserted into the wound iron core,
An outer iron type static induction electric device characterized in that an elastic member having an insulating property is disposed between the outer casing of the coil and the inner peripheral side of the leg portion of the wound core. In the outer iron type static induction electric appliance according to claim 1,
The outer iron-type static induction device, wherein the insulating elastic member is rubber. The outer iron type static induction electric appliance according to claim 1, further comprising:
An outer iron type static induction electric appliance comprising a band for tightening an outer periphery of the wound iron core. In the outer iron type static induction electric appliance according to claim 1,
The outer iron type static induction electric appliance characterized in that the elastic member having an insulating property is disposed over substantially the entire axial length of the coil. In the outer iron type static induction electric appliance according to claim 1,
The insulating elastic member is
A first rubber disposed over substantially the entire axial length of the coil;
A second rubber having a length shorter than the overall axial length of the coil and disposed in the axial central portion of the coil;
An outer iron type static induction electric machine characterized by comprising. In the outer iron type static induction electric appliance according to claim 5,
A plurality of the second rubbers are arranged at intervals in the axial direction of the coil. In the outer iron type static induction electric appliance according to claim 1,
The insulating elastic member is
A plurality of outer iron type static induction electric appliances arranged at intervals in the axial direction of a coil. In the outer iron type static induction electric appliance according to claim 2,
An outer iron type static induction electric appliance, wherein the rubber has a plurality of holes. An outer iron type static induction electric machine having an iron core and a coil wound around the iron core,
An outer peripheral coil wound around the outermost iron core of the iron core and the iron core adjacent to the outermost iron core;
An elastic member having an insulating property is disposed between an inner peripheral surface of the outermost peripheral iron core and a surface facing the inner peripheral surface of the outer peripheral coil,
An outer iron type transformer characterized in that an outer periphery of the outermost iron core is fastened by a band. In the outer iron type static induction electric appliance according to any one of claims 1 to 9,
The outer induction type static induction device, wherein the static induction device is a transformer or a reactor device. A method of manufacturing a shell-type static induction electric device comprising a plurality of adjacent wound cores and a coil inserted into the wound core,
A step of affixing an insulating elastic member to the core leg of the wound iron core, one of which is opened, or a step of affixing an insulating elastic member to the exterior of the coil;
Inserting the wound iron core into the coil, and disposing the insulating elastic member between the exterior of the coil and the leg of the wound core;
Performing a lapping operation for closing the wound core;
Tightening the outer periphery of the wound core with a band;
The manufacturing method of the outer iron type static induction electric machine provided with this. In the manufacturing method of the outer iron type static induction appliance according to claim 11,
The method for manufacturing an outer iron type static induction electric device, wherein the insulating elastic member is attached to a position corresponding to the entire axial length of the coil. In the manufacturing method of the outer iron type static induction appliance according to claim 11,
The insulating elastic member is affixed at a position corresponding to the entire axial length of the coil and a position corresponding to a substantially central portion in the axial direction of the coil. Method. In the manufacturing method of the outer iron type static induction appliance according to claim 11,
The method for manufacturing an outer iron type static induction device, wherein the insulating elastic member is rubber.

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