JP2017028014A - coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure insulation between primary and secondary windings, in a coil comprising a core and the primary and secondary windings.SOLUTION: A primary winding 4 is wound around an outer periphery of a columnar core 2, and the core 2 around which the primary winding 4 is wound is accommodated in a bobbin 6 formed of an insulator in a length direction. Both ends of the core 2 are located inside opened both ends of the bobbin 6. A closing member 8 is entered in the opened both ends of the bobbin 6 to close both ends of the bobbin 6 and support both ends of the core 2 in noncontact with an inner peripheral surface of the bobbin 6. A secondary winding 12 is wound around an outer peripheral surface of the bobbin 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coil having at least two windings wound around a core and mutually inductively coupled, such as a transformer or a coupling coil.

  Conventionally, as a coil in which two coil elements wound around a core are mutually inductively coupled, there is a transformer as disclosed in Patent Document 1, for example. According to the technique of Patent Document 1, a secondary winding is wound around the outer peripheral surface of a cylindrical bobbin, and the primary winding is wound on the outer side of the secondary winding, approaching the secondary winding. A cylindrical core is inserted into the bobbin. No separate insulator is disposed between the primary winding and the secondary winding.

JP 2007-149797 A

  In the technique of Patent Document 1, for example, the primary winding and the secondary winding may be appropriately selected to generate a high voltage in the secondary winding. In this case, according to the technique of Patent Document 1, since the primary winding and the secondary winding are arranged close to each other on the bobbin, a sufficient insulation distance cannot be ensured. Since an insulator is not disposed between the secondary winding and the secondary winding, the two cannot be sufficiently insulated. In addition, a core is inserted in the bobbin to increase the magnetic flux interlinking with the primary and secondary windings. If the positional relationship between the core and the two windings changes, mutual inductive coupling Changes and stable operation cannot be performed. There is no specific disclosure in Patent Document 1 on how to fix the core.

  According to the present invention, in a coil including a core and primary and secondary windings, insulation of the primary and secondary windings can be sufficiently secured, and the core can be stably fixed. Aim to provide coils

  The coil of one embodiment of the present invention has a columnar core. This core can be, for example, cylindrical or prismatic. At least one first winding is wound around the outer periphery of the core. The at least one first winding can be a primary winding or a secondary winding. One first winding may be used as a primary winding, and the other first winding may be used as a secondary winding and wound on the core. The at least one first winding may have a circular or square longitudinal cross-sectional shape. A core around which the first winding is wound is accommodated in a cylindrical body made of an insulator along the length direction thereof. The core is preferably arranged so that the central axis of the core is located on the central axis of the cylindrical body. Both ends of the cylindrical body are open, and both ends of the core are located inside the ends. That is, the core has a shorter length than the cylindrical body. The cylindrical body can be cylindrical or rectangular. A closing member enters the open ends of the cylindrical body to close both ends of the cylindrical body, and supports both ends of the core in contact with the inner peripheral surface of the cylindrical body. At least one second winding is wound around the outer peripheral surface of the cylindrical body. The at least one second winding may be a secondary winding when the at least one first winding is a primary winding and when the at least one first winding is a secondary winding. It can be a primary winding. One second winding may be a primary or secondary winding, and another second winding may be another secondary winding. As the at least one second winding, one having a circular or square longitudinal section can be used, or one having an insulating coating can be used.

  In the coil configured as described above, at least one first winding and at least one second winding are arranged with a cylindrical body interposed therebetween, and the first winding is wound. The core that is being arranged is arranged in the cylindrical body in a non-contact state with the cylindrical body. Therefore, the at least one first winding and the at least one second winding can secure a sufficient insulation distance and are suitable as a coil for generating a high voltage. The core is held in the cylindrical body by the closing member, the position of the core is constant, and the positional relationship between the core and the first and second windings does not change. Moreover, the core can be easily held in the cylindrical body. Since the at least one second winding can be wound around the outer peripheral surface of the cylindrical body, the at least one second winding can be easily wound. In addition, since both ends of the cylindrical body are closed by the closing member, there is a dustproof effect on the core and at least one first winding.

  Both ends of the at least one first winding may be led out through the closing member. If comprised in this way, the electrical connection to the at least 1 1st coil | winding in a cylindrical body can be performed easily.

  In the closing member, the outer peripheral surface of the portion that has entered the cylindrical body is in contact with the inner peripheral surface of the cylindrical body, and the end of the core enters the inner surface of the cylindrical member of the closing member. And it can have the accommodating part which touches the outer peripheral surface of the edge part of the said core.

  If comprised in this way, a core will be reliably fixed to a cylindrical body via a closure member, the position does not fluctuate, and it can maintain insulation of at least 1st and 2nd winding. it can.

  The closing member can also be configured by injecting silicone rubber into both ends of the cylindrical body. With this configuration, after the core is accommodated in the cylindrical body, the end portion of the core is surrounded by silicone rubber and injected so as to contact the inner peripheral surface of the insulator. Can be easily attached to the body.

  Further, the closing member can be made of synthetic resin. If comprised in this way, one end part of a core will be inserted in one of two obstruction members manufactured beforehand, a core will be inserted in a cylindrical body, and a closure member in which an end part of a core is inserted will be cylindrical. When the other end of the core is inserted into the other closing member and the other end of the core is inserted into the other closing member, the other closing member may be attached to the other end of the cylindrical body. It becomes easy.

  As described above, in the coil according to the present invention, the core is disposed in a non-contact manner in the cylindrical body, at least one first winding is wound around the core, and at least one second winding is provided on the outer peripheral surface of the cylindrical body. Since at least one first winding and at least one second winding are arranged at a distance from each other, the insulation between the two can be reliably ensured, Suitable for generating high voltage. In addition, for this purpose, the core disposed in the cylindrical body made of an insulator is supported by the closing member, and the closing member is attached to the cylindrical body. The insulation distance between the first winding and the at least one second winding does not change. Moreover, since the both ends of the cylindrical body are closed by the closing member, the dustproof effect on the core and at least one first winding is high.

It is a partially broken front view of the coupling coil of the 1st Embodiment of this invention. It is a vertical front view of the coupling coil of the 2nd Embodiment of this invention. It is a vertical front view of the modification of the closure member used in the coupling coil of 2nd Embodiment.

  The coil according to the first embodiment of the present invention temporarily applies a high-frequency high-frequency voltage at the time when supply of voltage to the welding load is started so that an arc is generated in the welding load, for example, in an electric arc welder. The present invention is applied to a coupling coil that boosts a high-frequency voltage and supplies it to the welding load in order to break the insulation by applying it to the welding load.

  As shown in FIG. 1, the coupling coil has a core 2. The core 2 has a columnar shape, for example, a columnar shape. At least one first winding, for example, a primary winding 4 is wound around the outer peripheral surface of the core 2. The primary winding 4 is wound in a predetermined number of turns at a predetermined pitch along the length direction of the core 2. As the primary winding 4, for example, an insulation-coated wire having a predetermined diameter with a circular longitudinal cross-sectional shape is used.

  A cylindrical body, for example, a cylindrical bobbin 6 is disposed so as to surround the core 2 around which the primary winding 4 is wound. For example, the central axis of the core 2 is disposed on the central axis of the bobbin 6. The bobbin 6 is made of an insulator having both ends opened, and the inner diameter thereof is selected to be larger than the diameter of the primary winding 4 * 2 + the diameter of the core 2. The inner peripheral surface of the bobbin 6 is in a non-contact state with a predetermined distance from the primary winding 4 by a predetermined distance. The length of the bobbin 6 is such that the core 2 is entirely located inside the bobbin 6 and both ends of the core 2 are located somewhat inside the both open ends of the bobbin 6. Is selected to be longer than the length dimension.

  In order to hold the core 2 around which the primary winding 4 is wound in the bobbin 6, a closing member, for example, silicone rubber 8 is injected into the bobbin 6 from both open ends of the bobbin 6. It is cured. The injected silicone rubber 8 comes into contact with the inner peripheral surface of the open end portion of the bobbin 6, and the end portion of the core 2 enters the inside from the inner peripheral surface, and the periphery of the end portion of the core 2 is silicone rubber. 8 surrounds. The silicone rubber 8 holds the core 2 such that the central axis thereof is positioned on the central axis of the bobbin 6. The core 2 maintains a uniform distance with respect to the inner peripheral surface of the bobbin 6. Further, both ends of the primary winding 4 pass through the silicone rubber 8 and are respectively drawn out from both ends of the bobbin 6. Both ends of the primary winding 4 are connected to a high frequency voltage generator.

  An insulating tube 10 is placed on the outer peripheral surface of the bobbin 6. At least one second winding, for example, a secondary winding 12, is wound along the length direction of the bobbin 6 in contact with the tube 10. For example, a rectangular coated wire having a vertical cross-sectional shape is used for the secondary winding 12, and the number of turns is larger than the number of turns of the primary winding 4. Accordingly, the high frequency voltage applied to the primary winding 4 is boosted and generated across the secondary winding 12.

  In the coupling coil configured as described above, the core 2 around which the primary winding 4 is wound is disposed in the bobbin 6, and the secondary winding 12 is disposed outside the bobbin 6, The physical distance between the primary winding 4 and the secondary winding 12 is increased, and the insulation distance between them can be increased. As a result, sufficient insulation between the two can be ensured. In addition, since the insulating tube 10 is also disposed on the outer peripheral surface of the bobbin 6 and the secondary winding 12 is wound thereon, further insulation between the primary winding 4 and the secondary winding 12 is ensured. can do. Further, since the core 2 having a shorter length than the bobbin 6 is used and the core 2 is held in the bobbin 6 by the silicone rubbers 8 and 8, the distance of the core 2 to the secondary winding 12 varies. Insulation can be kept constant, and dust and dust can be prevented from entering the bobbin 6.

  A coupling coil according to a second embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the same part as the coupling coil of 1st Embodiment. Also in the coupling coil of this embodiment, the core 2 is placed in the bobbin 6 so that the primary winding 4 is wound around the outer peripheral surface of the core 2 and the central axis of the core 2 is positioned on the central axis of the bobbin 6. Has been placed. The length dimension of the core 2 is shorter than the length dimension of the bobbin 6, and both ends of the core 2 are positioned inside the open ends at both ends of the bobbin 6.

  In order to hold the core 2 in the bobbin 6, closing members, for example, lid bodies 8 a and 8 b are attached to both ends of the bobbin 6. The lid bodies 8a and 8b are, for example, substantially short cylindrical shapes of the same shape made of synthetic resin, and their outer peripheral surfaces are in surface contact with the inner peripheral surface of the bobbin 6. It coincides with the open end face of. On the other end surfaces of the lids 8a and 8b, that is, the inner end surfaces, there are recesses 81 and 81 having a central axis that coincides with the central axis of the bobbin 6 and having the same diameter as that of the housing portion, for example, the core 2. The ends of the core 2 are inserted into the recesses 81 and 81, respectively. These recesses 81, 81 have a sufficient depth to hold the end of the core 2. With these lids 8a and 8b, the core 2 is held in the bobbin 6 at a distance equal to the inner peripheral surface of the bobbin 6. In order to lead out both ends of the primary winding 4 to the outside of the bobbin 6, lead-out passages 82 and 82 penetrating into and out of the bobbin 6 are formed in the lids 8a and 8b. The passages 82 and 82 have a width equal to the diameter of the primary winding 4 from the outer peripheral surfaces of the lid bodies 8a and 8b toward the center, and the lid bodies 8a and 8b are omitted.

  A secondary winding 12 a is wound around the outer peripheral surface of the bobbin 6. The secondary winding 12a is wound in two layers, and the insulating tube 14 is disposed between the first layer and the second layer. The number of turns of the secondary winding 12 a is larger than the number of turns of the primary winding 4.

  The core 2 around which the primary winding 4 is wound is fixed to the bobbin 6 as follows. One end of the core 2 is inserted into, for example, the recess 81 of the lid 8a, and the other end of the core 2 to which the lid 8a is not attached is connected to the inside of the bobbin 6 from the one end of the bobbin 6. The lid 8a is fixed to one end side of the bobbin 6. Thereafter, the lid 8b is attached to the other end of the bobbin 6 while the other end of the core 2 in the bobbin 6 is inserted into the recess 81 of the lid 8b. Conversely, after the other end portion of the core 2 is inserted into the lid body 8b and fixed to the other end portion of the bobbin 2, the one end portion of the core 2 is the recess 81 of the lid body 8a. The lid 8 a may be attached to one end side of the bobbin 6 while being inserted into the bobbin 6. After the core 2 is attached to the bobbin 6, the secondary winding 12 a is wound around the outer peripheral surface of the bobbin 6. Alternatively, the core 2 may be mounted in the bobbin 6 after the secondary winding is wound around the bobbin 6 first.

  Even in this coupling coil, the insulation distance between the primary winding 4 and the secondary winding 12a can be increased, and the insulation between the two can be sufficiently ensured, similarly to the coupling coil of the first embodiment. In addition, the insulation can be kept constant without the distance of the core 2 from the secondary winding 12a changing due to the use of the lids 8a and 8a. The lids 8a and 8a are made of synthetic resin, and after inserting the core 2 into the bobbin 2, the end of the core 2 is inserted into the recess 81 of the lid 8a so that the lid 8a is connected to the open end of the bobbin 2. Since it suffices to attach it to the part, the manufacture becomes easy.

  In 1st and 2nd embodiment, although this invention was implemented in the coupling coil, it is not restricted to this, For example, this invention can also be implemented in a transformer. In the first and second embodiments, only the primary winding 4 is wound around the core 2 as the first winding. However, in addition to the primary winding 4, another first winding is provided. It is also possible to use another first winding as another secondary winding wound around the core 2. Similarly, the secondary windings 12 and 12a are wound around the outer peripheral surface of the bobbin 6 as the second winding. However, the present invention is not limited to this, and other than the secondary windings 12 and 12a, Another second winding can be wound around the outer peripheral surface, and this second winding can be used as another secondary winding. In the first and second embodiments, the core 2 is a cylindrical one, but a prismatic one can be used. Similarly, in the first and second embodiments, the bobbin 6 has a cylindrical shape, but a rectangular tube shape can also be used. In the second embodiment, only one passage 82 is formed for one lid 8a, 8b. However, a plurality of passages 82 may be formed in the closing members 8a, 8b. In the first embodiment, the insulating tube 12 is used, and in the second embodiment, the insulating tube 14 is used. However, these are unnecessary depending on circumstances.

  Further, in the second embodiment, the concave portion 81 is formed in the short cylinder to form the lids 8a and 8b. However, as shown in FIG. What formed the short cylinder 86 in which the end which has the same internal peripheral surface was open | released can also be used as the cover bodies 8a and 8b. If the lids 8a and 8b are configured in this manner, the lid can be reduced in weight.

2 core 4 primary winding (at least one first winding)
6 Bobbins (tubular bodies)
8 Silicone rubber (blocking member)
8a, 8b Lid (closing member)
12 12a Secondary winding (at least one second winding)

Claims (5)

Columnar core,
At least one first winding wound around the outer periphery of the core;
The core around which the first winding is wound is accommodated along the length direction inside, and is made of an insulator in which both ends of the core are located inside the both ends in a cylindrical shape with both ends open. A cylindrical body,
A closing member that enters the both ends of the cylindrical body and closes both ends of the cylindrical body, and supports both ends of the core in non-contact with the inner peripheral surface of the cylindrical body;
At least one second winding wound around the outer peripheral surface of the cylindrical body,
Coil provided.   The coil according to claim 1, wherein both ends of the at least one first winding pass through the closing member and are led out to the outside.   2. The coil according to claim 1, wherein an outer peripheral surface of a portion of the closing member that has entered the cylindrical body is in contact with an inner peripheral surface of the cylindrical body, and is located inside the cylindrical body of the closing member. An end portion of the core enters the surface and has a receiving portion that contacts the outer peripheral surface of the end portion of the core.   3. The coil according to claim 1, wherein the closing member is obtained by injecting silicone rubber into both ends of the cylindrical body.   The coil according to claim 1 or 2, wherein the closing member is made of synthetic resin.

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