JPH0747859Y2 - Core cover for choke coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cover that houses a core of a choke coil of a noise filter.

(Prior Art) FIG. 3 is a partial cross-sectional view showing a choke coil of a conventional nozzle filter, in which a cylindrical core 1 is constructed by combining two plastic division covers 3 and 4. The coil 5 is housed in the core cover 2, and the coil 5 is wound around the core 1 via the core cover 2. Reference numeral 6 denotes a hetero-phase coil isolation ridge formed around the core cover 2 in the winding direction of the coil 5.

(Problems to be solved by the invention) In such a choke coil having a relatively small size, the core 1 is small, and the amount of shrinkage of the volume at the time of firing the core is small, so that the dimensional variation of the core 1 is small. Since the dimensional tolerance can be set small, the gap between the core 1 and the core cover 2 can be narrowed, and the core cover 2 can be thin in order to accommodate and support the lightweight core 1. When the core 1 is housed in the core cover 2 and the coil 5 is wound, the core cover 2 is deformed and comes into close contact with the core 1, and no gap is created between the core 1 and the core cover 2.

However, in the case of a large choke coil, the core 1 also becomes large, and the volume shrinkage during firing of the core also becomes large. Therefore, the dimensional variation of the core 1 also becomes large, and the dimensional tolerance of the core 1 also increases due to the yield. Inevitably, the core cover 2 has to be manufactured in consideration of the dimensional tolerance, so that the gap between the core 1 and the core cover 2 may be wide and large. In order to house the core 1 in the core cover 2, the core cover 2 is also thick enough to support a relatively large weight of the core 1. Therefore, the core 1 is housed in the core cover 2 and the coil 5 is wound. Core cover 2 is not deformed, the core 1 of the core cover 2
A gap 9 is formed between and. Therefore, the core 1 may be cracked by vibration, impact, or the like applied to the choke coil from the outside.

In view of the above-mentioned problems of the prior art, the present invention has a structure in which the core of the choke coil can be accommodated in the core cover without rattling, thereby preventing core cracking, and in terms of insulation between the coil and the core. Another object is to provide an excellent core cover for choke coil.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a choke coil core cover that accommodates a ring-shaped or tubular core, which is formed around the core cover and separates the coils of different phases. A core fixing resin injecting slit for communicating the inside and outside of the core cover is provided on the separating ridge.

Further, as a preferred structure for carrying out the present invention, the coil cover is composed of two split covers, and the abutting portions of the split covers are spaced apart from each other in the circumferential direction.
The present invention is characterized in that projections and recesses are provided, both split covers are formed in the same shape and the same size, and the corresponding projections and recesses of the split covers are fitted to each other to combine the split covers.

(Operation) In the structure of the present invention, since the inner surface of the core cover and the core are integrated by the resin, rattling of the core is prevented. Moreover, when a plurality of cores are stacked and housed in the core cover, the cores do not collide with each other even when vibration is applied. Further, by providing the resin injection slit on the protrusion of the core cover, the insulation distance between the coil and the core is not impaired.

Further, by adopting a structure in which both split covers have the same shape and the same size, both split covers can be manufactured by the same mold.

(Embodiment) FIG. 1 is a perspective view showing an embodiment of a core cover for a choke coil according to the present invention in a state before assembly, and FIG. 2 is a partial sectional view showing a state after assembly.

The core cover 10 is configured by combining two divided covers 11 and 12 made of a plastic molding material, and each divided cover 11 and 12 has an outer cylinder 13 and 14 and an inner cylinder 15 and 16, respectively.
And, by forming a single-sided opening shape consisting of the bottom plate portions 17, 18 closing one end of the inner and outer cylinders, a ring-shaped core accommodating portion is formed between them, and the opening portion is abutting surfaces 19, 20. Become. This example shows an example in which a three-phase coil 5 (see FIG. 2) is wound, and three ridges 23 to 25, 26 to be wound around the respective divided covers 11 and 12 in the winding direction. 28 are formed at intervals of 120 degrees.

A protrusion 29 is formed on the end face of the protrusion 23 of the split cover 11 on the outer cylinder 13 side, and a recess 30 into which the protrusion 29 is fitted is formed at the corresponding portion of the protrusion 26 of the other split cover 12. To be done. Also,
On the contrary, a protrusion 31 is formed on the end face of the protrusion 27 of the split cover 12 on the outer cylinder 14 side, and a recess 32 into which the protrusion 31 is fitted is formed at the corresponding portion of the protrusion 24 of the split cover 11. Is formed. In the portion provided along the inner cylinders 15 and 16 of each of the ridges 23 to 28,
A groove 33 is formed into which a separator (not shown) having a Y-shaped cross section for fitting between the different-phase windings is fitted.

Core fixing resin injecting slits 34 are formed at the portions of the protrusions 23 to 28 provided along the bottom plates 17 and 18, respectively.

As will be understood from the above description, these split covers 11 and 12 are formed in the same shape, and are molded using the same mold.

As shown in FIG. 2, these split covers 11 and 12 accommodate a plurality of ring-shaped cores 21 in a cylindrical shape or a stack, as shown in the drawing, and accommodate a protrusion 29 and a recess. 30 are fitted together, the projections 31 and the recesses 32 are fitted together, and the abutting surfaces 19 and 20 are brought into contact with each other to be assembled.

In the state where the divided covers 11 and 12 are combined, the ridges 23 and 26, 24 and 27, 25 and 28 are respectively continuous, and the coil 5 is wound between these continuous ridges. It In this way, after the coil 5 is wound and the choke coil is electrically connected and set in the case (not shown) of the noise filter, the resin 35 is injected. By the injection of the resin 35, the resin 35 enters the core cover 10 through the slit 34, and a part of the resin enters between the cores 21 and is cured, so that the core 21 is fixed in the core cover 10.

In this way, when the core 21 is fixed in the core cover 10 and vibration or impact is applied to the choke coil,
The core 21 is held in the core cover 10 without rattling,
Further, adjacent cores 21 do not collide with each other.

In the above embodiment, each split cover 11, 12 has three ridges.
Although an example of forming each book is shown, two or four books are formed.
The present invention can be applied to the case where more than one piece is formed, and the present invention can be applied to a case where one divided cover is configured to close the other cover-shaped divided cover.

(Effect of the Invention) According to claim 1, the core cover is filled with resin and the core is fixed in the core cover, so that the core can be housed in the core cover without rattling, and vibration or impact is applied to the choke coil. The core does not rattle in the core cover,
Prevents core cracking. Further, when a plurality of cores are accommodated in the core cover, collision between cores can be avoided, and thus core damage due to collision between cores can be prevented.

Also, since resin injection slits are provided on the ridges around the core cover, the insulation between the coil and the core, and thus the insulation between the coils of different phases, is compared to when slits are provided on the bottom plate of the core cover. Sex is secured.

According to the second aspect, since the split covers are formed in the same shape and in the same FIG. 3, both split covers can be manufactured by the same mold, and economical efficiency can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a core cover for a choke coil according to the present invention in a state before assembly, FIG. 2 is a partial sectional view showing a state after the assembly, and FIG. 3 is a conventional core cover. FIG.

Claims (2)

[Scope of utility model registration request] 1. A core cover for a choke coil that accommodates a ring-shaped or tubular core, and a core fixing resin injection for communicating the inside and outside of the core cover with a protrusion formed around the core cover and separating coils of different phases. A core cover for a choke coil, which is provided with a slit for use. 2. The core cover is composed of two divided covers, and the abutting portions of the divided covers are provided with protrusions and recesses at intervals in the circumferential direction, and both divided covers have the same shape and the same shape. The choke coil core cover according to claim 1, wherein the choke coil core cover is formed in a size, and the corresponding projections and recesses of the split cover are fitted to each other to combine the split covers.