JPS6310632Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a power input socket with a structure in which an inner case into which a filter element is inserted is connected to a power input socket, and a metal outer case is further placed over the rear part of the socket and the outer periphery of the inner case. Regarding noise filters.

The present applicant has previously proposed a noise filter with a socket that combines a socket and a metal case that houses a filter element. However, in a structure that simply connects a metal case to a socket,
Insulation inside the metal case and positioning of filter elements such as coils and capacitors pose problems, and the structure for providing output terminals insulated from the metal case becomes complicated.

In view of the above points, the present invention has a structure in which an inner case made of insulating resin that houses a filter element is connected to a power input socket, and the rear part of the socket and the outer periphery of the inner case are covered with an outer case made of metal. A noise filter with a power input socket that is easy to manufacture and assemble, and has a case that allows for easy and reliable insulation and positioning of filter elements such as coils and capacitors, as well as a sufficient shielding effect due to the metal outer case. This is what we are trying to provide.

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

1 to 4, a power input socket 1 has a recess on the front surface into which a plug fits, and a pair of power input contacts 2A, 2B and a ground contact protrude into the recess. She has three children. Here, a grounding connection fitting 4 extending rearward in a substantially L-shape is connected and fixed to the grounding contact 3, and an insulating resin-made grounding fitting 4 is connected and fixed to the grounding contact 3. The inner case body 5 is placed thereon. The inner case main body 5 has an L-shaped plate consisting of a bottom part and a back part bent perpendicularly to the bottom part, and a capacitor storage recess 6A,
6B is formed, and output terminals 7A and 7B are formed on the back side.
Further, the tip of the grounding connection fitting 4 serves as a grounding terminal 8. On the other hand, a lid body 9 made of insulating resin for forming the inner case together with the inner case body 5 has an inverted U-shape having an upper surface and both side surfaces, and is designed to fit into the inner case body 5. There is. Further, the metal outer case 10 is formed into a rectangular tube shape by drawing or the like, and the socket 1
It has an integral flange portion 11 that comes into close contact with the rear surface of the attachment portion. Further, the back side has a window 12 for protruding the output terminals 7A, 7B provided on the inner case body to the outside, and a slit-like notch 13 and a cut-out portion 14 for pulling out the ground terminal 8. are doing.

The assembly procedure for such structures of the inner case and outer case is as shown in Fig. 1. By placing the case body 5, and then arranging the line-earth capacitors 20A and 20B in the capacitor storage recesses 6A and 6B as shown in FIG. 2, and further providing the common mode choke coil 21 and the line-to-line capacitor 22, conduct. Then, the first winding 21 of the common mode York coil 21
Connect the contactor 2A and the output terminal 7A at A, and connect the second
A winding 21B connects the contact 2B and the output terminal 7B, and line-to-ground capacitors 20A and 20B are connected between the power input contacts 2A and 2B and the ground contact 3, respectively, and further, Contact 2
An interline capacitor 22 is connected between A and 2B. After completing the specified wiring work, turn the inverted U as shown in Figure 3.
The letter-shaped lid body 9 is fitted to the inner case body 5, and then the metal outer case 10 is placed on it, and the output terminals 7A and 7B are pulled out through the window 12 as shown in FIG. Pull out 8. At this time, as shown in FIG. 5, the cut and raised portion 14 on the outer case 10 side and the grounding terminal 8 are spot welded or spot brazed at point P, or the claw 30 formed on the grounding terminal 8 and the outer case 10 side are spot welded or spot brazed. By soldering or spot brazing the protruding piece 31 at point Q, an electrical connection between the outer case 10 and the grounding terminal 8 and, in turn, a connection with the grounding contact 3 is made, and the outer case 10 is removed. It will be mechanically fixed to the socket 1 so that it does not occur.

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

(1) An insulating resin inner case consisting of an inner case body 5 and a cover body 9 is connected to the socket 1, and capacitors 20A and 20 as filter elements are installed inside this case.
Since the structure accommodates B, 22 and the coil 21, each element can be reliably insulated.
Moreover, positioning can be facilitated.

(2) Since the structure is such that the metal outer case 10 covers the rear of the socket 1 and the outer periphery of the inner case 2, the noise filter can be reliably shielded and the structure can be made robust. Further, in this case, the outer case 10 may be formed into a rectangular tube shape, so that it can be constructed at low cost by drawing.

(3) The grounding contact 3 of the power input socket 1 has a structure in which a grounding connection fitting 4 is extended rearward, on which the inner case body 5 can be placed, and the connection fitting 4 can be used as a grounding terminal 8 to fix the outer case 10 when covered with the metal outer case 10. Therefore, the structure is simple, and the inner case body 5, which is separate from the socket 1, can be used to fix the outer case 10. There are advantages that can be used.

Note that it is also possible to integrally mold the inner case body 5 with the socket 1 using resin.

As explained above, according to the present invention, an inner case made of insulating resin is connected to a power input socket, a filter element is housed in the inner case, and a metal outer case is attached to cover the rear part of the socket and the outer periphery of the inner case. Since the structure is such that the filter element can be easily insulated and positioned, the shielding effect can be improved, and a noise filter with a power input socket that is easy to manufacture and assemble can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the noise filter with a power input socket according to the present invention, showing a state in which the inner case body is connected to the power input socket;
FIG. 2 is an exploded perspective view showing a structure in which a filter element is provided in a structure in which an inner case body is connected to a socket;
Fig. 3 is an exploded perspective view showing a structure in which an inner case is connected to a socket and an outer case is further covered, Fig. 4 is a perspective view showing the structure of the completed embodiment, and Fig. 5 shows the outer case and the grounding terminal. FIG. 3 is an enlarged perspective view showing the connection structure of FIG. 1...Power input socket, 2A, 2B, 3...
...Contact, 4...Grounding fitting, 5...Inner case body, 6A, 6B...Capacitor storage recess,
7A, 7B...Output terminal, 8...Ground terminal,
9... Lid body, 10... Metal outer case, 20A, 2
0B, 22...Capacitor, 21...Common mode chiyoke coil.

Claims (1)

[Scope of utility model registration request] A grounding fitting 4 extending rearward is connected and fixed to the grounding contact of a power input socket having a pair of power input contact and grounding contact protruding into the front recess, and the grounding contact is connected and fixed to the grounding contact. An inner case made of insulating resin is arranged on the connection fitting 4 for connection to the power input socket, a coil and a capacitor are housed in the inner case, a connection terminal is provided on the back of the inner case, and the ground A substantially rectangular cylindrical metal outer case having a notch for pulling out the grounding terminal 8 formed at the end of the connection fitting 4 is placed over the rear part of the socket and the outer periphery of the inner case, and the grounding terminal 8 A noise filter with a power input socket, characterized in that the noise filter is connected and fixed to the outer case.