JPH0619149Y2 - Plug-in with built-in noise filter element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a plug-in plug having a choke coil as a noise filter element, and particularly, to improve heat dissipation and assembling workability of the choke coil and to reduce the size thereof. The present invention relates to an insertion plug with a built-in noise filter element.

(Prior Art) In recent years, there has been a remarkable increase in the multifunctionality of various devices such as general household appliances and office equipment, and devices with various electronic components such as microprocessors and high-speed switching devices mounted in high density It is being offered to the market.

However, such devices tend to have low resistance to external noise because the electronic components are mounted at high density as described above. For this reason, there have been many failures such as malfunction due to the influence of noise entering the equipment via the power line from the outside.

Therefore, various plugs with a built-in noise filter element have been proposed and put into practical use in order to prevent external noise from entering the equipment and prevent the above-mentioned troubles.

A conventional insertion plug having a built-in noise filter element is generally one in which a choke coil which is a noise filter element is interposed between the blade and the wire core of the cord (for example, Japanese Utility Model Publication No. 61-157288). Gazette, Actual Kaihei 1-8188
No. 0 publication).

Conventionally, such an insertion plug with a built-in noise filter element has a structure in which a choke coil which is a noise filter element is wrapped in an integrally molded insulating case, and the enclosed body is further integrally molded. It was a thing.

(Problems to be solved by the invention) However, since the above-described plug-in is based on double molding, the thickness of the insulating layer from the choke coil which is the noise filter element to the outer portion of the molded product Was a big thing.

Therefore, there is a problem in that the thick insulating layer hinders the dissipation of heat generated from the choke coil.

Further, there is a problem in that the entire plug may be in a high temperature state by hindering the heat dissipation.

In addition, since it is double-molded, there is a problem that it is impossible to reduce the overall size.

Further, in this type of conventional plug, the choke coil and the choke coil are connected after the choke coil and choke coil are set in the case. Since the periphery of the blade base is surrounded by a case, there is a problem in that the connection work must be performed in a case where there is not enough space, and thus assembly workability is poor.

The present invention was devised to solve the above-mentioned conventional problems, and improves the heat dissipation of the choke coil and downsizes it by eliminating the members surrounding the choke coil. At the same time, the present invention provides an insertion plug with a built-in noise filter that also improves assembly workability.

(Means for Solving the Problems) A plug-in plug with a built-in noise filter according to the present invention uses a choke coil as a noise filter element, and a plug blade connected to one end of a winding of the choke coil is inserted into a base body. A plug plug formed by resin-molding the end of the cord connected to the other end of the winding of the choke coil, the choke coil, the base body, and the base of the blade,
At the center of the base body, a choke coil support body fitted in the hole of the core of the choke coil is provided so as to project in a direction opposite to the direction of the blade, and the choke coil support body causes the choke coil on the base body. It is fixed and supported in a skewered shape.

(Function) Since the choke coil is fixedly supported on the base body in a skewered manner by the choke coil support, there are no members such as a case found in the conventional one around the choke coil. Therefore, it is possible to form the whole by single molding.

Further, since it is possible to form the whole by single molding in this way, the thickness of the insulating layer from the choke coil to the outer portion of the molded product can be formed as thin as possible. The heat is efficiently dissipated from the coil.

Moreover, since there are no other members around the substrate, let alone the choke coil, it is extremely easy to connect the choke coil winding to the cord and blade even after the choke coil is fixedly supported on the substrate. You can do it. Further, since the direction of inserting the choke coil support into the hole of the core of the choke coil and the direction of inserting the blade into the base are the same direction, the above-mentioned connection is made in advance before the choke coil is fixedly supported on the base. It is also possible to carry out work.

(Embodiment) An embodiment of the noise plug element built-in plug according to the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of an essential part of a noise filter element built-in plug according to the present invention, FIG. 2 is a perspective view at the end of assembly, and FIG. 3 is a front view thereof.

The plug 1 uses a choke coil 2 as a noise filter element, and plug blades 3 connected to the choke coil 2 are inserted into a base 4.

In the choke coil 2, a core 21 has a cylindrical shape, and two windings 22 and 22 are wound around the core 21, and one end of each of the windings 22 and 22 is a blade 3 ，
3 and the other end is connected to the wire cores 51, 51 of the cord 5.

The base body 4 has a convex shape in a front view, and the base body 4 is provided with through holes 41, 41 for inserting and fixing the blades 3, 3.

Further, in this invention, a flat plate-shaped choke coil support body 43 fitted in the hole portion 23 of the core 21 of the choke coil 2 is provided in the center of the upper surface portion 42 of the base body 4 in the insertion direction of the blades 3, 3. Are projected in the opposite direction.

Line grooves 431 and 431 having a V-shaped cross section are provided on both side edges of the choke coil support body 43.

Corresponding to this, projecting ridges 24, 24 having a V-shaped cross section are formed in the hole 23 of the choke coil 2 from the core 21 toward the inside.

Incidentally, reference numerals 44, 44 are wire cores 5 connected to the blades 3, 3.
It is a recessed portion for hiding 2, 52.

Next, the assembling of the respective parts formed as described above will be described.

From the disassembled state of FIG. 1, insert the blades 3 and 3 into the through hole 4 of the substrate 4.
1 and 41, the choke coil support 43 provided at the center of the base body 4 is fitted into the hole 23 of the choke coil 2.

At this time, the groove grooves 431, 4 of the choke coil support body 43
31 is a protruding ridge portion 24 of the hole portion 23 of the choke coil 2,
24 is guided, the base body 4 and the choke coil 2 are integrated, and there are no other members around the choke coil 2 and the base body 4 (see FIG. 2).

Then, in the state in which the base body 4 and the choke coil 2 are integrally formed in this manner, the base body 4 and the choke coil 2 are resin-molded to integrally form the insulating layer 6, as shown by a chain line in FIG. .

Since the entire structure can be formed by single molding in this way, the thickness of the insulating layer 6 made of resin from the choke coil 2 to the outer peripheral portion of the molded product can be formed to be as thin as possible. It is possible to efficiently dissipate heat from the choke coil 2.

Incidentally, in this embodiment, the core 2 of the choke coil 2 is
Although 1 has been described as having a cylindrical shape, the shape of the core 21 is not limited to this, and other shapes such as a rectangular tube shape can be applied.

(Effects of the Invention) As described above, in the plug-in plug with a built-in noise filter element according to the present invention, the choke coil support body fitted in the hole portion of the core of the choke coil is arranged in the center of the base body in the direction of the blade. Is projecting in the opposite direction, and the choke coil support is fixedly supported in a skewered shape on the base body by this choke coil support, so unlike the conventional plug using a case, the surroundings of the choke coil There are no other components in. Therefore, the thickness of the insulating layer from the choke coil to the outer part of the molded product can be made as thin as possible, which results in efficient heat dissipation from the choke coil and maximizes choke coil performance. It can be used for a limited period of time, and the intrusion of external noise can be effectively prevented.

Further, as described above, the thickness of the insulating layer from the choke coil to the outer portion of the molded product can be made as thin as possible, so that it is possible to easily achieve miniaturization compared to the conventional case type. At the same time, it is possible to increase the number of turns of the choke coil as compared with the conventional one, in which case the characteristics as a noise filter can be further improved.

Moreover, since there are no other members around the substrate, let alone the choke coil, it is extremely easy to connect the choke coil winding to the cord and blade even after the choke coil is fixedly supported on the substrate. You can do it. Also, since the direction of inserting the choke coil support into the hole of the core of the choke coil and the direction of inserting the blade into the base are the same direction, the above-mentioned formation is performed before the choke coil is fixedly supported on the base. It is also possible to carry out work. Therefore, the assembling workability is also excellent.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part of an embodiment of a noise filter element built-in plug according to the present invention, FIG. 2 is a perspective view at the end of assembly, and FIG. 3 is a front view thereof. 1 ... Plug-in 2 ... Choke coil 21 ... Core 23 ... Hole 3 ... Plug blade 4 ... Base 43 ... Choke coil support 5 ... Cord 6 ... Insulation layer

Claims (1)

[Scope of utility model registration request] 1. A choke coil is used as a noise filter element, a plug blade connected to one end of a winding of the choke coil is inserted into a base body, and a cord connected to the other end of the winding of the choke coil. Is an insertion plug formed by resin-molding the end portion of the choke coil, the base body, and the base portion of the blade, and a choke coil support body fitted in the hole portion of the core of the choke coil at the center of the base body. A plug plug with a built-in noise filter element, which is provided so as to protrude in a direction opposite to the direction of the blade, and the choke coil is fixedly supported on the base body in a skewered shape by the choke coil support.