JPH054171Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a power cord with a noise filter, which has a plug at one end and a noise filter element at the other end, and particularly relates to a power cord with a noise filter, which has a plug at one end and a noise filter element at the other end. The present invention relates to a power cord with a noise filter that is easy to clean and that prevents damage to the noise filter element and improves reliability.

[Background technology] For example, as a power cord with a noise filter,
Some of these have been proposed in Utility Model Application No. 61-105969 (Utility Model Application No. 63-12177) and Utility Model Application No. 61-107522 (Utility Model Application No. 63-14375). This power cord with a noise filter has a noise filter element made up of a series inductance and a parallel capacitance built into the plug provided at one end of the power cord. It is designed to block out noise that comes in from the power supply that is plugged in.

[Problem that the invention attempts to solve]

However, according to this power cord with a noise filter, even if the power cord has a shield, when the noise frequency becomes high (for example, 3MHz or higher),
When the induced current in the shielding layer leaks into the wire core, the power cord becomes an antenna and receives external radiated noise, or radiates noise inside the device to the outside.

[Means for solving problems]

This invention was made in view of the above, and in order to prevent the power cord from receiving radiation noise as an antenna and from radiating noise to the outside,
This product provides a power cord with a noise filter, which has a noise filter installed at the end of the power cord on the device side.In addition, the noise filter is installed at one end in order to facilitate the installation of the noise filter, prevent damage, and improve reliability. In a power cord that supplies power to a device located at the other end by plugging a plug into a power source, the power cord is located at the other end of the power cord, receives the other end of the power cord, and is connected to a pair of power sources. A cord receiving part that branches the wire core in a predetermined direction, an element housing part that stores a noise filter element whose one end is connected to the power supply wire core, and another pair of cords that are connected to the other end of the noise filter element. an insulating casing consisting of a wire core pull-out part for drawing out the power wire core to the power supply section of the device; and the other pair of power wire cores formed from the other end of the power cord to the insulating casing. It has a molded protector coated so that the terminal end is guided outside by a predetermined length, and the insulating casing includes a core guide groove formed around the element accommodating part, the core lead-out part, and the core guide groove formed around the element accommodating part. A shielding core and a grounding core are provided, each having an integrated connection terminal for connecting the power supply core located in the core guide groove and the noise filter element, and formed in layers with the core guide groove. This invention provides a power cord with a noise filter, which is characterized by having another guide groove for guiding the wire core.Hereinafter, the power cord with a noise filter of the present invention will be explained in detail.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which a molded protector 200 is formed at the end of a power cord 100 having a pair of power cores 110, 120, a grounding core 130, and a shielding layer 140. Power wire cores 110 and 12 from the opposite side of the mold protector 200
0, the shielding wire 150 connected to the grounding wire 130 and the shielding layer 140 is connected to the power supply section of the device (not shown)
It is growing to. The mold protector 200 is a cord protector 210 that protects the end of the power cord 100.
and a main body portion 220 that protects an insulating casing, which will be described later.
It has a plate-shaped locking part 240 that is provided by forming a groove 230 of a predetermined width between the main body part 220 and the main body part 220 . Reference numeral 300 indicates a device attachment portion having a recess 310, and by fitting the attachment portion 300 into the groove 230 of the mold protector 200, the power cord 100 with a noise filter is fixed to the recess 310.

FIG. 2 shows an exploded state of the embodiment shown in FIG. 1 before the mold protector 200 is formed, and the same reference numerals indicate the same parts, so redundant explanation will be omitted. However, a noise filter element 400 and an insulating casing 500 are newly illustrated. The noise filter element 400 is formed by winding a pair of coils 420 and 430 around a magnetic core 410.
430 is the connecting end 421, 422 and 43
It has 1,432. Further, the insulating housing 500 receives the terminal end of the power cord 100 and the wire core 11
0, 120, 130, 150, and a cord receiving part 510 which is surrounded by walls 521 on all sides, and has four slits 522, 523, 524, 5.
25 and reinforced by ribs 526 and 527;
It has a wire core guide groove 530 formed to surround 0. The cord receiving parts 510 are connected at the upper part by a connecting part 511, and a pair of connecting terminals 531 (only one shown) is provided at the end of the wire core guide groove 530.

FIG. 3 shows the insulating casing 500 of FIG. 2 from the bottom, where the bottom of the element accommodating portion 520 is shown as 528, and other core guide grooves 540 are provided at both ends of the core guide as described above. It is formed in a layered manner with the groove 530. An elastic portion 543 is formed in the outer wall 541 of the wire core guide groove 540 by providing a slit 542, and the inner wall portion 544 thereof is configured to protrude so as to be thicker than the other wall surface 545.

Returning to FIG. 2 again, the shielding layer 140 of the power cord 100 is bundled into a bundled wire 140A, and the shielding wire core 150 is connected to the shielding wire core 150 by the connection terminal 141.
The conductor is connected to the conductor, and is covered from the outside with a heat-shrinkable tube 142. Further, other power cores 110 and 120 connected to the power cores 110 and 120 of the power cord 100 via the noise filter element 400 are prepared on the upper right side of the insulating casing 500.

Figure 4 shows a power cord 100 and an insulating casing 500.
The figure shows a state in which the noise filter element 400 housed in the housing is electrically connected and assembled in a predetermined positional relationship. 120
A wire core pull-out section 55 that pulls out the wire toward the power supply section of the device.
0 is formed, and a connecting terminal 551 is provided in the wire core pull-out portion 550.

In the above configuration, at the terminal end of the power cord 100, the power wire cores 110, 120 and the ground wire core 130
are branched, and the shielding layer 140 is focused and connected to the shielding wire core 150. The terminal end of the power cord 100 is located in the cord receiving part 510, and the power wire cores 110, 120 are placed in the wire core guide groove 530,
Further, the grounding wire core 130 and the shielding wire core 150 are inserted into the wire core guide groove 540. At the same time, the noise filter element 400 is housed in the element housing part 520, and the ends 421, 422, 431,
432 and connect the power wire core 110 and the end portion 432 of the coil 430 through the connection terminal 531, and the power wire core 120 and the end portion 422 of the coil 420 through the connection terminal 551. coil 4
The ends 421, 431 of the wires 20, 430 are connected to other prepared power wire cores 110, 120. Thereafter, by forming the mold protector 200, a power cord with a noise filter is obtained.

As is clear from the above explanation, since the connection terminal is pre-installed on the housing, connection can be made by simply wrapping the ends of the power wire core and the coil and pressing them into the connection terminal. Since the shielding wire core is held by simply pushing out the elastic part of the guide groove and inserting it, excellent workability can be obtained.

Furthermore, since the mold protector is composed of the cord protector, the plate-shaped locking part, the fixing groove, and the main body, it is possible to prevent the tension and bending force of the electric wire from being applied to the noise filter element. , making it easier to attach to equipment. Furthermore, as is clear from the drawings, since the wire cores are arranged in parallel, the configuration can be simplified and wiring errors can be reduced.

In the above embodiments, a noise filter having a coil was shown, but the characteristics can be further improved by using a combination of a coil and a capacitor. In this case, the insulating casing will have a portion that accommodates the capacitor.

[Effect of idea]

As explained above, according to the power cord with a noise filter of the present invention, a noise filter is provided at the end of the power cord on the equipment side, so that the power cord does not receive radiation noise as an antenna or radiate noise to the outside. In addition, an insulating casing including a cord receiving portion, an element housing portion, a wire core pull-out portion, a wire core guide groove, and a connection terminal is provided,
The entire structure is covered with a molded body after the noise filter element is housed and the specified connection work is completed, making it easier to install the noise filter, preventing damage to the noise filter, and improving reliability. can.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
FIG. 1 is an overall perspective view, FIG. 2 is an exploded view, FIG. 3 is a perspective view of the insulating casing, and FIG. 4 is a perspective view before the molded body is covered. Explanation of symbols, 100...Power cord, 110,
120...Wire core for power supply, 130...Wire core for grounding,
140... Shielding layer, 150... Shielding wire core, 20
0... Mold protector, 210... Cord protector, 220... Main body, 230... Groove, 240...
... Locking part, 300 ... Equipment mounting part, 400 ... Noise filter element, 500 ... Insulating casing, 51
0... Cord receiving section, 520... Element accommodating section, 530, 540... Wire core guide section, 550...
Core drawer.

Claims (1)

[Claims for Utility Model Registration] (1) In a power cord 100 that supplies power to a device located at the other end by plugging a plug provided at one end into a power source, the power cord 100 is located at the other end of the power cord 100. death,
A cord receiving part 510 that receives the other end of the power cord 100 and branches the pair of power cores 110 and 120 in a predetermined direction, and a noise filter element 400 that has one end connected to the power cores 110 and 120. Element housing section 5 that accommodates
20, and another pair of power supply wire cores 11 connected to the other end of the noise filter element 400.
an insulating casing 500 consisting of a wire core pull-out section 550 for drawing out 0.0, 120 to the power supply section of the device; It has a mold protector 200 that covers the terminal ends of the wire cores 110 and 120 so as to lead them out by a predetermined length, and the insulating casing 500 is connected to the element housing section 5
A wire core guide groove 530 formed around 20;
The wire core pull-out portion 550 and the wire core guide groove 5
The power supply cores 110, 120 located at 30
and another wire core guide for guiding the shielding wire core 150 and the grounding wire core 130 formed in a layered manner with the wire core guide groove 530 and having an integrated connection terminal 531 for connecting the noise filter element 400 and the wire core guide groove 530. A power cord with a noise filter characterized by having a groove 540. (2) The mold protector 200 is located on the power cord 100 side with a groove 230 having a predetermined width formed between the main body 220 that protects the insulating casing 500 and the main body 220. Practical use of a structure that is composed of a plate-shaped locking part 240 and a cord protection part 210 that protects the other end of the power cord 100, and a corresponding mounting part 300 of the device is fitted into the groove 230 of a predetermined width. A power cord with a noise filter according to claim 1 of the patent registration claim.