JPH0767014B2 - Insulation case - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an insulating case used to insulate an annular core and a winding applied to the annular core and to insulate the windings from each other. It is a thing.

[Conventional technology]

FIG. 2 is an exploded perspective view showing a conventional insulating case disclosed in, for example, Japanese Utility Model Publication No. 55-135409.
Is a ring-shaped core, 2B is a case body made of synthetic resin having a ring-shaped hollow portion 5 with one end opened so that the ring-shaped core 1 can be housed, and 3B is a hollow cylindrical portion 6 in the center of the case body 2B. The partition plate is made of synthetic resin and has a predetermined thickness that is equally divided into a plurality of parts parallel to the axial direction. The partition plate protrudes from the upper end surface f of the hollow portion 6 in the cylinder for a predetermined length. A partition plate 3B projects from the bottom surface by a predetermined length at the bottom of 2B, and a projection 2d is formed continuously in the radial direction and having a predetermined width up to the outer periphery. The partition plate 3B is formed integrally with the case body 2B. 4B is an annular top plate made of synthetic resin that can close the annular hollow portion 5 of the case body 2B. 4d is a protrusion that is formed integrally with the annular top plate 4B, has the same height as the protruding height of the partition plate 3B, and has a predetermined width and that is present at symmetrical positions in the radial direction of the annular top plate 4B,
It has a part 4e slightly protruding from the inner diameter part in a substantially triangular shape, and a partition plate is provided at the tip of the substantially triangular protruding part 4e.
Vertical grooves 4c are formed so that they can be fitted to both ends of 3B. Reference numeral 7 denotes a hollow portion inside the cylinder of the annular core.

[Problems to be Solved by the Invention]

In the conventional insulating case, the partition plate is in the hollow portion inside the cylinder of the case body, is integrally molded with the case body, and has a thin wall thickness and a long axial length. Therefore, there has been a problem that a mold for molding this is complicated and difficult to make.

In addition, there is a problem that the resin flow is bad and a shrinkage cavity defect occurs when the insulating case is molded using a mold.

The present invention has been made to solve the above problems, and provides an insulating case that simplifies the structure of a resin molding die and facilitates the flow of resin during molding to facilitate molding. The purpose is to do.

[Means for Solving the Problems]

The present invention is a case body formed of a synthetic resin having an annular hollow portion having an open end for accommodating an annular core and an in-cylinder hollow portion, and a synthetic resin closing the annular hollow portion of the case body. And a ring-shaped top plate.The ring-shaped top plate has a protrusion located at a symmetrical portion in the radial direction on the upper surface and protruding inward from the upper and inner diameters. A partition plate that divides the hollow portion in the axial direction is integrally formed, and a vertical groove that fits on both side edges of the partition plate is formed on the inner peripheral surface of the hollow portion inside the cylinder of the case body. The above-mentioned object is to be achieved by the constitution characterized by the above.

[Action]

Since the case body having the annular hollow portion and the hollow portion inside the cylinder does not require the partition plate to be integrally molded, the structure of the mold molded with synthetic resin is simple, and the resin flow at the time of molding is good. It does not cause defects such as scars.

The annular top plate is integrally formed with a partition plate that extends from the protrusion and divides the hollow portion inside the cylinder of the annular core in the axial direction, but since the shape is simple, the flow of resin during molding is good. It does not cause defects such as scars.

When the case body is covered with an annular top plate, both side edges of the partition plate fit into the vertical grooves on the inner peripheral surface of the hollow inside of the case body, so the partition plate can be easily and securely fixed in place. To be done.

〔Example〕

An embodiment of the present invention will be described below with reference to the exploded perspective view of FIG. 1. Parts that are the same as or correspond to those of the conventional example will be denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, 2A is a case main body having an annular hollow portion 5 and an inner cylindrical hollow portion 6 capable of accommodating the annular core 1, and 2a is provided in the axial direction of the cylindrical portion existing in the central portion of the case main body 2A. It is a triangular portion that slightly protrudes, and protrudes a predetermined length from the bottom surface of the cylindrical portion. 2b is a substantially triangular protrusion
A protrusion having the same height as the bottom-side protruding height of 2a, a predetermined width, and being provided continuously with this substantially triangular protrusion 2a and existing at symmetrical positions in the radial direction. Reference numeral 2c is a vertical groove provided over the entire length in the axial direction at the tip of the substantially triangular protrusion 2a so that the partition plate 3A can be fitted at both ends thereof.

3A is a partition plate that fits both side edges into the vertical groove 2c and divides the hollow cylindrical portion 6 of the case main body 2A into a plurality of parts parallel to the axial direction. Ring top plate
It is molded integrally with 4A.

4A is an annular top plate capable of closing the annular hollow portion 5 of the case main body 2A, 4a is integrally formed with the annular top plate 4A, and is a protrusion having a predetermined width and height, which are present at symmetrical positions in the radial direction, and,
It protrudes from the inner diameter part in a substantially triangular shape, and this protruding part 4b
Is connected to the partition plate 3A.

All of the insulating cases having the above-mentioned structure are molded with synthetic resin. Conventionally, since the partition plate 3A was molded integrally with the case body 2A, there was a problem that the flow of the resin deteriorates during molding and a shrinkage cavity defect occurs, but the case body 2A of the insulating case according to the present invention has a partition Since the plate 3A is not integrally molded, the structure of the resin molding die is simplified and the die is easily manufactured.
Since the number of branch points during mold molding was small, the resin flow was smooth and shrinkage cavity defects did not occur.

Further, the partition plate 3A is formed integrally with the annular top plate 4A, but since it is formed in a substantially T-shape, it does not hinder the flow of resin at the time of mold molding and does not cause a shrinkage cavity defect. .

〔The invention's effect〕

As described above, according to the present invention, since the case main body having the annular hollow portion and the hollow portion inside the cylinder does not need to integrally mold the partition plate, the structure of the mold for molding the synthetic resin is simple. In addition, the flow of resin at the time of molding is improved and shrinkage cavity defects are not caused.

The annular top plate is integrally formed with a partition plate that extends from the protrusion and divides the hollow portion inside the cylinder of the annular core in the axial direction, but since the shape is simple, the flow of resin during molding is good. It does not cause defects such as scars.

When the case body is covered with an annular top plate, both side edges of the partition plate fit into the vertical grooves on the inner peripheral surface of the hollow inside of the case body, so the partition plate can be easily and securely fixed in place. To be done.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an insulating case showing an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a conventional insulating case. 1 is an annular core, 2A is a case body, 2a is a substantially triangular protrusion, 2b is a bottom protrusion, 2c and 4c are vertical grooves, 3A is a partition plate, 4A is an annular top plate, and 4a is an annular top plate protrusion. , 4b is a substantially triangular protrusion, 5 is an annular hollow portion, 6 is a hollow portion in the cylinder of the case body, and 7 is a hollow portion in the cylinder of the annular core. In each drawing, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A case body formed of a synthetic resin having an annular hollow portion having an open end for accommodating an annular core therein, and a hollow portion inside a cylinder, and a synthetic resin closing the annular hollow portion of the case body. A ring-shaped top plate, and the ring-shaped top plate has a protrusion located at a radially symmetrical portion of the upper surface and protruding upward and inward from the inner diameter, and extending from the protrusion to project from the cylinder of the case body. A partition plate that divides the inner hollow portion in the axial direction is integrally formed, and a vertical groove that fits on both side edges of the partition plate is formed on the inner peripheral surface of the cylindrical inner hollow portion of the case body. Insulation case characterized by