JPS6138275Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cylindrical noise filter suitable for power line filters and the like.

1 and 2 show the structure of a conventional cylindrical filter, and FIG. 3 shows its electrical connection. In those figures, a resin insulating tube 2 is arranged inside a cylindrical conductor case 1, and inside this is a common mode York coil 5, which has a pair of windings 4A and 4B wound around a toroidal core 3, and a line capacitor 6
and line bypass capacitors 7A and 7B are housed. An insulated terminal plate 8 is attached to the opening of the cylindrical conductor case 1.
are provided with metal terminals 9A to 9D. Winding 4A of common mode York coil 5 is connected between metal terminals 9A and 9C, winding 4B is connected between metal terminals 9B and 9D, and line capacitor 6 is connected between metal terminals 9A and 9B. be done. Further, a series circuit of line bypass capacitors 7A and 7B is connected between metal terminals 9A and 9B, and an intermediate connection point between both capacitors is drawn out as an earth lead 10. Incidentally, a mounting screw portion 11 is integrally formed in the cylindrical conductor case 1.

By the way, in the conventional cylindrical noise filter, all the metal terminals 9A to 9D are provided on the terminal plate 8 located on one end surface of the case 1.
Electrostatic and electromagnetic coupling is likely to occur between the metal terminals 9A, 9B serving as input terminals and the metal terminals 9C, 9D serving as output terminals. For this reason, the noise attenuation characteristic deteriorates in the high frequency region. In addition, metal terminal 9
The soldering work of the chain coils 5 and capacitors 6, 7A, and 7B for A to 9D is troublesome. That is, after soldering the metal terminals 9A and 9B, the metal terminals 9C and 9D are rotated 180 degrees.
The soldering work is difficult to automate because the soldering points are close together, and the soldering work requires skill. Furthermore, when the inside of the insulating cylinder 2 is cast with resin, the resin is poured into the insulating cylinder 2 in advance, and the chiyoke coil 5 is placed in it.
For the capacitors 6, 7A, and 7B, the structure connected to the metal terminals 9A to 9D must be placed upside down, and the resin casting operation is also time-consuming. Furthermore, four metal terminals 9A are attached to the insulated terminal plate 8.
9D to 9D, it is difficult to shield the insulated terminal plate 8 side, and the distance between terminals (distance between live parts) cannot be increased. Further, since the distance between the terminals of the insulated terminal plate 8 is small, there is a drawback that it is impossible to use feedthrough capacitors in place of the metal terminals 9A to 9D due to space constraints.

The present invention was made in order to eliminate the drawbacks of the prior art as described above, and includes a cylindrical inner case constructed by abutting structure of half-split insulating cylindrical bodies, and one end surface of the cylindrical inner case. By providing only an input terminal and providing only an output terminal on the other end face, we aim to improve the noise attenuation characteristics in the high frequency range and provide a cylindrical noise filter that is easy to assemble and solder. That is.

Embodiments of the cylindrical noise filter according to the present invention will be described below with reference to the drawings.

4 and 5 show a first embodiment of the present invention. In these figures, the cylindrical inner case 20
The first half insulating cylindrical body 21A and the second half insulating cylindrical body 21B are butted together and are divided into two along a plane along the axial direction. One end surface of the first half-split insulating cylindrical body 21A has metal terminals 22A, 2 as input terminals.
2B, and metal terminals 22C and 22D as output terminals are provided on the other end surface, and the periphery of each of these metal terminals 22A to 22D is a thick cylindrical portion 23. In addition, a pair of coil positioning ribs 2 are provided inside the half-split insulating cylindrical body 21A.
4A and 24B are integrally formed, and the common mode York coil 5 is fitted into this portion.
Similarly, coil positioning ribs are also formed on the half-split insulating cylindrical body 21B. As a result, the common mode York coil 5 is reliably positioned by the coil positioning ribs of both the half-split insulating cylindrical bodies 21A and 21B. Also, inside the half-split insulating cylindrical body 21A, there is an inter-line capacitor 6 and line bypass capacitors 7A, 7.
B is stored. The winding 4A of the chiyoke coil 5 is connected between the metal terminals 22A and 22C,
The winding 4B is connected between the metal terminals 22B and 22D, and the interline capacitor 6 is connected between the metal terminals 22A and 22D.
2B, and the series circuit of line bypass capacitors 7A and 7B is also connected to metal terminals 22A and 22.
Connected between B. Line bypass capacitor 7
An intermediate connection point between A and 7B is drawn out as a ground lead 25. After the assembly and soldering of the insulating cylindrical halves 21A are completed, another insulating cylindrical halves 21B is placed over the insulating cylindrical halves 21A and 21B, so that they are butted and integrated. . Adhesive, fitting structure, etc. can be used as a means of integration. Aluminum, aluminum,
A conductor exterior case 26 made of iron or the like is placed thereon. In this case, the exterior case 26 has a through hole 27 on the end surface, and the metal terminals 22C, 22D and the cylindrical thick wall part 23
protrudes outward from the through hole 27. Incidentally, if necessary, resin may be cast into the space surrounded by the coil positioning ribs 24A and 24B to further securely fix the chiyoke coil 5. Due to this resin casting, the heat of the chiyoke coil 5 is conducted to the outer case 26 via the resin and the cylindrical inner case 20, so that the heat dissipation effect can also be improved.

6 and 7 show examples of mounting fittings for mounting the cylindrical noise filter shown in the first embodiment. The mounting bracket 30 shown in FIG. 6 is for mounting the cylindrical noise filter parallel to the chassis, etc., and the mounting bracket 31 shown in FIG. 7 has a structure convenient for mounting perpendicular to the chassis, etc.

According to the first embodiment, the following effects can be achieved.

(1) Metal terminals 22A, 22B as input terminals on one end surface of the first half-split insulating cylindrical body 21A
Since metal terminals 22C and 22D are provided as output terminals on the other end face, separation between input and output is ensured, and deterioration of attenuation characteristics in the high frequency range due to coupling between input and output terminals can be prevented. can.

(2) The cylindrical inner case 20 is divided into two insulating cylindrical bodies 2
It is easy to assemble because it is composed of abutting structure of 1A and 21B. That is, after the coil 5 and the capacitors 6, 7A, and 7B are assembled in one half-split insulating cylindrical body 21A, the other half-split insulating cylindrical body 21B is covered.

(3) Each of the metal terminals 22A to 22D can be provided at the same height position with respect to the half-split insulating cylindrical body 21A. As a result, soldering work is extremely easy and automation of soldering can be achieved.

(4) Since only two metal terminals are provided on each end face of the half-split insulating cylindrical body 21A, the distance between the terminals (distance between live parts) can be increased, and sufficient dielectric strength can be ensured. can. Further, complete shielding is possible by applying a conductive plating shield to the end face portion of the cylindrical inner case 20 on the opening side of the conductor outer case 26.

(5) Even when it is desired to fix the common mode York coil 5 by resin casting, it is only necessary to place resin between the pair of coil positioning ribs 24A and 24B, so the resin casting work is simple, and the resin casting process is easy. It also requires less amount.

(6) Mounting bracket 3 as shown in Figure 6 or Figure 7
By using 0.31, it can be mounted parallel to or perpendicular to the chassis, etc., which has the advantage of a large degree of freedom in mounting.

(7) Each half-split insulating cylindrical body 21A, 21B can be easily molded with insulating resin, and the metal terminal 2
Since simultaneous molding of 2A to 22D is easy,
It is also possible to achieve significant cost reductions.

(8) By using the conductor outer case 26, heat radiation can be improved and mechanical robustness can be achieved.

FIG. 8 shows a second embodiment of the present invention. In this figure, a cylindrical inner case 40 is composed of a butted structure of first and second half-split insulating cylindrical bodies 41A and 41B, and a conductor plate 42 that closes an opening on one end surface of the structure. It's on. The conductor plate 42 is provided with feedthrough capacitors 43A and 43B that serve as input terminals and line bypass capacitors. That is, each feedthrough capacitor 43A, 43B
The center conductor serves as an input terminal, and an external metal fitting is connected and fixed to the conductor plate 42 by soldering. The winding 4A of the common mode choke coil 5 connects to the center conductor of the feedthrough capacitor 43A and the metal terminal 22.
The winding 4B is connected between the center conductor of the feedthrough capacitor 43B and the metal terminal 22D, and the winding 4B is connected between the feedthrough capacitors 43A and 43B.
An interline capacitor 6 is connected between them. In addition, each half-split insulating cylindrical body 41A, 41B integrally has coil positioning ribs 24A, 24B,
A conductor outer case 26 is placed on the outside of the cylindrical inner case 40.
The second embodiment is the same as the first embodiment described above.

According to the second embodiment, the feedthrough capacitor 43
Since A and 43B are used as terminals, the high frequency characteristics of the noise attenuation characteristics can be further improved. Further, one end face is constituted by a conductive plate 42, and since the ground can be taken out from this conductive plate 42, there is no need to provide a special ground lead.

Note that feedthrough capacitors can be used for all terminals, and if the outer case 26 is made of a magnetic material, not only electrostatic shielding but also magnetic shielding becomes possible. Furthermore, when the chiyoke coil is oval or oblong, the cross sections of the cylindrical inner case and the outer case can also be oval or oval in order to match them.

FIG. 9 shows a third embodiment of the present invention. In this embodiment, a feedthrough capacitor 4 is used as a terminal on one side.
3A and 43B are used, and an inlet socket 50 is used as a metal terminal on the other side. That is, the inlet socket 50 is fixed to the half-split insulating cylindrical body 41A with a fixing screw 51, and the winding 4A of the common mode choke coil 5 is connected to the center conductor of the feedthrough capacitor 43A and the metal terminal 51C of the inlet socket 50. connected between
Winding 4B is connected between the center conductor of feedthrough capacitor 43B and metal terminal 51D of inlet socket 50. The ground metal terminal 51E of the inlet socket 50 is connected to the conductor plate 42. A notch 52 corresponding to the inlet socket 50 is formed in the half-split insulating cylindrical body 41B, and a through hole 53 corresponding to the inlet socket 50 is formed in the conductor exterior case 26. Note that the other configurations are the same as those of the second embodiment described above.

As explained above, according to the present invention, by constructing the cylindrical inner case by the butt structure of the half-split insulating cylindrical bodies, the assembly work is simple and the work is extremely easy. A cylindrical noise filter suitable for automation can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing a conventional cylindrical noise filter, Fig. 2 is a bottom view thereof, Fig. 3 is a circuit diagram thereof, and Fig. 4 is a first embodiment of the cylindrical filter according to the present invention. FIG. 5 is an exploded perspective view, FIGS. 6 and 7 are perspective views showing a mounting bracket for installing the cylindrical filter of the embodiment, and FIG. 8 is a second embodiment of the present invention. FIG. 9 is an exploded perspective view showing a third embodiment of the present invention. 4A, 4B...Winding, 5...Common mode choke coil, 6...Line capacitor, 7A,
7B...Line bypass capacitor, 20,40
...Cylindrical inner case, 21A, 21B, 41A,
41B...Half-split insulating cylindrical body, 22A to 22
D... Metal terminal, 23... Cylindrical thick walled part, 24
A, 24B...Coil positioning rib, 26...
Conductor exterior case, 30, 31...Mounting metal, 42
...Conductor plate, 43A, 43B...Feedthrough capacitor.

Claims (1)

[Scope of utility model registration request] A cylindrical inner case is constructed by combining a first half-split insulating cylindrical body and a second half-split insulating cylindrical body each having a shape in which a cylindrical shape is divided into two along a plane along the axial direction of the cylindrical body. Coil positioning ribs are integrally formed in the inner case, a toroidal inductor is arranged between the coil positioning ribs, a capacitor is housed in the cylindrical inner case, and one end surface of the cylindrical inner case A cylindrical noise filter characterized in that an input terminal is provided at one end thereof, an output terminal is provided at the other end surface, and a conductive outer case is provided so as to cover the outer peripheral surface of the cylindrical inner case.