JPH0621216U - Insulation case and magnetic core - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an insulating case having good dimensional accuracy and good workability for a small core, and a magnetic core using the same. The outer cylinder is formed higher than the inner cylinder, and after the magnetic core is inserted, the portion of the outer cylinder protruding from the inner cylinder is bent.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an insulating case for protecting a magnetic core such as a ferrite core used as a circuit component, an amorphous magnetic alloy winding core, and an ultrafine crystal magnetic alloy winding core, and a magnetic core using the insulating case.

[0002]

[Prior art]

 Conventionally, magnetic cores used as circuit components have a coating or case to protect from short circuit with live parts, contamination such as oxidation, and damage due to external force, except for some Ni-Zn ferrite cores. Etc. are being protected. In general, for large and medium-sized cores (up to about 6 mm in inner diameter), coating and case encapsulation are relatively easy. However, since the Ni-Zn ferrite core having a high specific resistance was mainly used for the small core, it was used without coating or encapsulation. On the other hand, metal magnetic materials such as amorphous magnetic alloys and ultra-fine crystalline magnetic alloys, which have become widespread in recent years, require a protective or insulating treatment such as coating or case encapsulation before use because the core is fragile and the specific resistance of steel materials is low. Has become. This small core made of ferrite and magnetic metal material was mainly protected and insulated by coating when protection and insulation treatment were required. This is because when a small core is sealed in a case, it is difficult to process a large amount, the workability is poor, and the cost is high.

[0003]

[Problems to be solved by the device]

 When coating conventional small cores, epoxy resin coating was mainly used. Although this epoxy resin coating enables a large amount of treatment, there were problems that the small core had an excessively small inner diameter and poor dimensional accuracy. In particular, a wound magnetic core of an amorphous magnetic alloy or an ultrafine crystalline magnetic alloy is formed by winding a ribbon-shaped alloy, and thus contains air between ribbon layers. Therefore, air bubbles and pinholes are easily generated on the coating surface, resulting in a decrease in yield. In addition, if the case is enclosed, the above-mentioned problem of reduced yield can be solved, but with a small core, the lid member is a small part, so handling and mounting becomes difficult, workability is poor, and cost rises. It was not the target. In view of the above, it is an object of the present invention to provide an insulating case and a magnetic core that have good dimensional accuracy and good workability in a small core.

[0004]

[Means for Solving the Problems]

 The present invention relates to an insulating case for protecting a magnetic core from short circuit, contamination, damage, etc., wherein the insulating case includes an inner cylinder, an outer cylinder and a bottom portion connecting them, and is surrounded by the inner cylinder, the outer cylinder and the bottom portion. It is an insulating case in which a ring-shaped magnetic core is inserted in the recess, the outer cylinder is formed higher than the inner cylinder, and after inserting the magnetic core, the portion of the outer cylinder protruding from the inner cylinder is bent to form a lid. is there. Further, the present invention comprises a cylinder, an outer case formed higher than the cylinder, an insulating case composed of a bottom portion connecting the cylinder, and a wound magnetic core made of an amorphous magnetic alloy or an ultrafine crystalline soft magnetic alloy. A portion of the outer cylinder projecting from the inner cylinder is a magnetic core that is inserted into the wound magnetic core and then bent by heat and pressure to form a lid. In the present invention, the insulating case is composed of one part, and unlike the conventional insulating case, a separately molded lid is not used, so that the handling and workability are good.

Further, in the present invention, by using an insulating case made of a thermoplastic resin, the case side wall is formed higher than the core to be enclosed in advance, and the case side wall is bent and shaped by applying heat and pressure to form a lid. The magnetic core case can be easily enclosed. Examples of the thermoplastic resin used in the present invention include PBT, PPO, PP, nylon and the like, but the present invention is not limited to these examples. Examples of the shaping tool for shaping the side wall of the case include a commercially available heat staking tool, and a soldering iron having a mortar-shaped depression at the tip and a Teflon process on the depression.

[0006]

[Embodiment] FIG. 1 is a sectional view of an insulating case according to an embodiment of the present invention. This embodiment is an insulating case molded of PBT resin (without filler), and is composed of an inner cylinder 1, an outer cylinder 2 and a bottom portion 3 connecting them, and the outer cylinder 2 is higher than the inner cylinder 1. Has been formed. FIG. 2 shows a sectional view in which the magnetic core is enclosed in the insulating case of this embodiment. In FIG. 2, a winding core 4 of Amorphus magnetic alloy is inserted into a recess surrounded by an inner case 1, an outer case 2 and a bottom 3 of an insulating case, and a protruding portion 2a of the outer case 2 is bent by heat and pressure. , Which constitutes the lid. The manner in which this lid is constructed is shown in FIGS. First, as shown in FIG. 3, the magnetic core 4 is inserted into the insulating case. Next, the shaping tool 5 is lowered from above. This orthopedic tool 5 has a tapered recess 6 which is formed by cutting the tip of a cone. The shaping tool 5 is heated to about 160 ° C. and pressed against the insulating case as shown in FIG. Thereby, the protruding portion 2a of the outer cylinder 2 is bent to form a lid. The angle θ of the depression 6 may be gradually changed from, for example, about 45 degrees to 180 degrees, and the molding may be performed stepwise.

[0007]

[Effect of device]

 According to the present invention, it is possible to use a monolithic insulating case, insert the magnetic core into the insulating case, shape the insulating case with a shaping tool, and cover the magnetic core with a lid, which improves workability. Good and dimensional accuracy is also good. It is particularly effective for small cores, and is also effective as a wound magnetic core of amorphous magnetic alloy or ultrafine crystalline magnetic alloy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an insulating case according to an embodiment of the present invention.

FIG. 2 is a sectional view of a magnetic core according to an embodiment of the present invention.

FIG. 3 is a sectional view of a manufacturing process of an embodiment according to the present invention.

FIG. 4 is a sectional view of a manufacturing process of an embodiment according to the present invention.

[Explanation of symbols]

 1 inner cylinder 2 outer cylinder 3 bottom 4 magnetic core 5 shaping tool

Claims (2)

[Scope of utility model registration request] 1. An insulating case for protecting a magnetic core from short circuit, contamination, damage, etc., wherein the insulating case is composed of a cylinder, an outer cylinder and a bottom connecting them, and is surrounded by the inner cylinder, the outer cylinder and the bottom. It is an insulating case in which a ring-shaped magnetic core is inserted in the recess, the outer cylinder is formed higher than the inner cylinder, and the portion protruding from the outer cylinder after the magnetic core is inserted is bent to form a lid. Insulation case characterized by 2. An insulating case including an inner cylinder, an outer cylinder formed higher than the inner cylinder, and a bottom portion connecting them, and a wound magnetic core made of an amorphous magnetic alloy or an ultrafine crystalline soft magnetic alloy. A magnetic core, wherein a portion of the outer cylinder protruding from the inner cylinder is a lid that is bent by heat and pressure after the wound magnetic core is inserted.