JP4470309B2 - Capacitor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a capacitor used in an electric device for motor operation, power factor improvement, charge / discharge, smoothing, and the like.
[0002]
[Prior art]
Conventionally, in a capacitor in which a capacitor element is housed in a capacitor case and filled with a thermosetting resin together with a terminal plate having a terminal for connection to an external power source, the capacitor element is positioned when housed in the capacitor case. It has not been.
[0003]
In addition, the lead wire derived from the metallicon electrode provided on both end faces of the capacitor element is electrically insulated from the metallicon electrode which is different from the metallicon electrode from which the lead wire is derived. It is common to use an insulated wire.
[0004]
[Problems to be solved by the invention]
However, when such a conventional technique is used to construct a capacitor, there are various problems.
[0005]
That is, since the capacitor element is not positioned in the capacitor case, the specific gravity of the capacitor element is lighter than that of the thermosetting resin filled in the capacitor case, so that buoyancy acts on the capacitor element. Therefore, the capacitor element floats or is eccentric with respect to the center of the capacitor case. Thus, the capacitor element has a problem that the distance between the terminal provided on the terminal plate and the lead wire led out from the capacitor element is close.
[0006]
In some cases, there is a problem that the electrical insulation between the capacitor element and the terminal or the lead wire cannot be maintained during the use of the capacitor.
[0007]
Furthermore, due to the characteristics of the capacitor, the thermosetting resin that fills the capacitor case needs to completely cover the capacitor element. However, since the capacitor element floats, the capacitor case is filled with a large amount of thermosetting resin. There was a need to do.
[0008]
As countermeasures, use a wire with electrical insulation for the lead wire derived from the capacitor element and divide the thermosetting resin filling process into two steps, and fix the capacitor element in the first time with a small amount of heat. There is a method of filling and curing a curable resin, and filling and curing an amount of thermosetting resin until the capacitor element is covered in the second time, but this has increased man-hours and costs.
[0009]
The present invention aims to solve the above problems.
[0010]
[Means for Solving the Problems]
To this end, the present invention capacitor, a thermosetting resin is filled in the capacitor case and the capacitor case containing the capacitor element, fitted with the capacitor case, for connection to an external power source The capacitor case includes a protrusion , the capacitor case includes a protrusion, and the terminal plate includes a protrusion having a hollow portion, which is fitted into a winding core of a pair of end surfaces of the capacitor element. The lead wire, which is provided so as to position the capacitor element and is led out from one metallicon electrode, passes through the core portion of the capacitor element and the cavity portion provided in the protruding portion of the terminal plate, and the connection Is connected to the terminal for .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
With the above structure, according to the capacitor of the present invention, a thermosetting resin is filled into the capacitor case a capacitor case containing the capacitor element, fitted with the capacitor case, metallikon of both end faces of the capacitor element A capacitor comprising a terminal plate connected to a lead wire derived from an electrode and provided with a terminal for connection to an external power source, wherein the capacitor case and the terminal plate each have a protrusion for positioning a capacitor element And has a function of preventing the capacitor element from floating or being eccentric with respect to the capacitor case even when the capacitor case is filled with a thermosetting resin.
[0013]
Then, a hollow portion is provided in the protruding portion of the terminal plate, and the lead wire led out from one metallicon electrode passes through the core portion of the capacitor element and the hollow portion provided in the protruding portion of the terminal plate, By connecting to the terminal for the connection, the lead wire led out from the metallicon electrode on one end face of the capacitor element and the metallicon electrode serving as a different electrode from the lead lead-out side are electrically connected The lead wire has a structure having an insulating mechanism, and has an effect of ensuring electrical insulation even when a bare electric wire is used in which the lead wire is not electrically covered.
[0014]
Hereinafter, a reference embodiment and an embodiment of the present invention will be described with reference to FIGS.
[0015]
( Reference Embodiment 1)
FIG. 1 is a cross-sectional view of the capacitor according to the first embodiment .
[0016]
In FIG. 1, a cylindrical shape formed of a flame-retardant plastic resin material, specifically, polybutylene terephthalate (hereinafter referred to as PBT) conforming to V-0 in the vertical combustion test specified in the US safety standard UL94. The capacitor case 2 is provided with a protrusion 3.
[0017]
A capacitor element 4 is accommodated in the capacitor case 2, a terminal plate 6 having a terminal 5 for connection to an external power source is disposed above the capacitor element 4, and a protrusion 7 is provided on the terminal plate 6. Filled with the above-mentioned flame-retardant plastic resin material, specifically, a thermosetting resin epoxy resin 10 that conforms to V-0 in the vertical combustion test defined in the US safety standard UL94 And cured.
[0018]
Note that the electrical connection between the capacitor element 4 and the terminal 5 is performed by an insulation-coated wire 9.
[0019]
Since the capacitor 1 has the above configuration, the capacitor element 4 is positioned at the protrusion 3 of the capacitor case 2 and the protrusion 7 of the terminal board 6. It is possible to prevent eccentricity of the capacitor case 2 with respect to the center of the capacitor case 2 and to ensure electrical insulation between the capacitor element 4 and the terminal 5 and between the capacitor element 4 and the insulation-coated wire 9. It was.
[0020]
In addition, by preventing the capacitor element 4 from floating, the amount of the epoxy resin 10 filled in the capacitor case 2 can be reduced.
[0021]
At this time, the material of the capacitor case 2 is not limited to PBT, but the above-mentioned flame-retardant plastic material such as polypropylene (PP), polycarbonate (PC), polyamide (PA), specifically US safety The same effect can be obtained even with a thermoplastic plastic resin that meets V-2 or higher in the vertical combustion test defined in the standard UL94.
[0022]
Note that the direction, position, shape, size, and the like of the projection 3 and the projection 7 to be formed are not particularly limited as long as they are designed according to the requirements.
[0023]
(Embodiment 2)
Figure 2 shows a cross-sectional view of the capacitor of the present invention.
[0024]
In Figure 2, it is provided with a protrusion 21 in the capacitor case 2 made of PBT described in the first reference embodiment.
[0025]
Further, a protrusion 23 is provided on the terminal plate 22, and the protrusion 23 is provided with a cavity 23 a through which the bare electric wire 24 passes.
[0026]
According to the above configuration, the protrusion 23 for positioning the capacitor element 4 is provided on the terminal plate 22, and the protrusion 23 is provided with the cavity 23 a through which the bare wire 24 led out from the metallicon electrode 8 b of the capacitor element 4 passes. Therefore, it is possible to ensure electrical insulation between the metallicon electrode 8a of the capacitor element 4 and the bare wire 24.
[0027]
【The invention's effect】
As described above, according to the capacitor of the present invention, by having a projection for positioning of the capacitor element in the capacitor case and the terminal plate, the capacitor element is floated by buoyancy of the thermosetting resin filled in the capacitor case And no eccentricity with respect to the capacitor element. As a result, insulation between the capacitor element and the terminal can be reliably ensured, and the amount of the thermosetting resin filled in the capacitor case can be suppressed.
[0028]
Then, a hollow portion is provided in the protruding portion of the terminal plate, and the lead wire led out from one metallicon electrode passes through the core portion of the capacitor element and the hollow portion provided in the protruding portion of the terminal plate for connection. A mechanism for electrically insulating the lead wire led out from the metallicon electrode on one end face of the capacitor element and the metallicon electrode serving as a different electrode from the lead wire lead-out side. As a result, electrical insulation between the capacitor element and the lead wire can be reliably performed, and a bare wire that is not electrically coated on the lead wire can be used.
[Brief description of the drawings]
Sectional view of the capacitor in FIG. 1 according to the first reference embodiment of the present invention cross-sectional view of the capacitor in the second embodiment of the present invention; FIG EXPLANATION OF REFERENCE NUMERALS
2 Capacitor case 3 Protrusion 4 Capacitor element 5 Terminal 6 Terminal plate 7 Protrusion 8a Metallicon electrode 8b Metallicon electrode 9 Insulated coated electric wire 10 Thermosetting resin

Claims (1)

A capacitor element having a metallikon electrodes on a pair of end surfaces, and a capacitor case containing the capacitor element, and the thermosetting resin contained in the capacitor case, fitted with the capacitor case, connection to an external power source A terminal plate having a terminal for the capacitor case, and a protruding portion on the capacitor case, and a protruding portion having a hollow portion on the terminal plate are fitted to the winding core portions of the pair of end faces of the capacitor element, respectively. The lead wire that is provided to position the capacitor element and is led out from one metallicon electrode passes through the winding core portion of the capacitor element and the cavity portion provided in the protruding portion of the terminal plate. , A capacitor connected to the terminal for the connection .

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