Electricity: conductors and insulators – With fluids or vacuum – With cooling or fluid feeding – circulating or distributing
Reexamination Certificate
1999-12-20
2001-07-17
Tso, Edward H. (Department: 2838)
Electricity: conductors and insulators
With fluids or vacuum
With cooling or fluid feeding, circulating or distributing
C174S050510, C361S707000
Reexamination Certificate
active
06262360
ABSTRACT:
FIELD OF THE INVENTION
The invention is directed to an electrical capacitor, particularly aluminum-electrolyte capacitors for alternating current operation, that is installed in a metallic housing with a planar housing floor, and whereby the housing floor is pressed against a cooling element.
BACKGROUND OF THE INVENTION
Electrolyte capacitors for alternating current installed in metallic housings with planar housing floors which are pressed against a cooling element are known from the Siemens Matsushita Components Data book 1997, “Aluminum-Electrolyte Capacitor”, page 146.
When capacitors, particularly aluminum-electrolyte capacitors, are charged with alternating voltage, the ohmic losses lead to an intrinsic heating of the capacitors. This temperature increase limits the maximum alternating current loadability and useful duration of these capacitors.
The alternating current loadability and useful duration can be boosted by a forced cooling of the component, particularly of the cup floor. In order to achieve a good heat elimination, the capacitor floor must lie as durably as possible against the cooling member with form-fit.
A number of measures have been disclosed up to now that only inadequately solve this problem. It is thus known to attach a threaded bolt to the cup floor with whose assistance a fastening to the cooling member ensues. However, it is thereby not assured that the cup floor is also joined with the cooling member in the edge region.
It is also known to undertake fastenings with ring clamps, whereby this fastening, however, can easily undo due to thermal and mechanical loads, so that a durable form-fit connection of cup floor and cooling member is also not achieved here. The aforementioned prior art also discloses a clamp fastening that slightly constricts the cup wall directly above the cup floor and, thus, secures the cup floor at the edge. Although a durable, positive-lock connection of cup floor and cooling member is achieved as a result of this, the known clamp connection has a high space requirement; for example, given a cup diameter of 75 mm, the clamp fastening has an outside diameter of 116 mm.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to durably fix the initially cited capacitor to a fastening element with form fit that has less of a space requirement than the known clamp mechanism.
This object is inventively achieved in that the cooling element has a depression corresponding to the housing circumference, and in that fastening pins that partially project into the depression are arranged at at least two opposite sides of the depression.
A space-saving and durably form-fit fixing of the capacitor on the cooling element is achieved as a result of this integration of the fastening element into the cooling member.
In an embodiment, the present invention provides an electrical capacitor assembly comprising a capacitor disposed in a metallic housing comprising a planar housing floor, a cooling element comprising a depression, the depression having a flat bottom surface, the housing being mateably received in the depression of the cooling element with the planar housing floor of the housing engaging the flat bottom surface of the depression, at least two fastening pins that partially project into the depression on opposing sides of the depression, the fastening pins engaging the housing and pressing the planar housing floor of the housing against the flat bottom surface of the cooling element.
In an embodiment, the cooling element comprises lateral bores that tangentially intersect the depression, each fastening pin being slidably disposed in one of the lateral bores.
In an embodiment, the housing comprises a radially inwardly circumferential groove disposed above the planar housing floor, the depression comprises a radially outwardly circumferential groove disposed above the flat bottom surface, the groove of the housing being aligned with the groove of the depression, the lateral bores tangentially intersecting the groove of the housing and the groove of the depression, the fastening pins engaging the housing at the groove of the housing and clamping the housing downward thereby pressing the planar housing floor against the flat bottom surface.
In an embodiment, the cooling element comprises at least two depressions and the assembly comprises at least two capacitors, the cooling element comprises at least four lateral bores with two lateral bores tangentially intersecting each depression, each fastening pin being slidably disposed in one of the lateral bores.
Other objects and advantages of the present invention will become apparent from reading the following detailed description and appended claims, and upon reference to the accompanying drawings.
REFERENCES:
patent: 3686612 (1972-08-01), Clements
patent: 4670771 (1987-06-01), Neidig et al.
patent: 5851337 (1998-12-01), Chen
patent: 43 31 377 A1 (1993-09-01), None
patent: 296 17 888 U1 (1996-10-01), None
Brochure entitled: “Aluminium-Elektrolyt-Kondensatoren” by Siemens Matsushita Components, 1997.
Epcos AG
Schiff & Hardin & Waite
Tso Edward H.
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