DE29617888U1 - Form of cup electrolytic capacitors - Google Patents

Description

PATENT ATTORNEY · · 2^8.13 Hijsuiji/Suwdesf&Igr;&rgr;«&dgr;&idiagr;&idiagr;&idiagr;< Germany

D1PL.-CHEM. DR. EVA RUHTZ :Mäte3 I :. J · '··· :'

Telephone (0 48 41J Sun 76 and 5Ö 77
Fax (04841) 61201

Also admitted to the European Patent Office

Dr. Eva Ruhtz · Markt 5 · 25813 Husum

German Patent Office, 14 October 1996

80297 Munich

Applicant: F & T Kondensatoren GmbH Nedderweg 25813 Husum

Form of can electrolytic capacitors

The invention relates to the cup shape of electrolytic capacitors.

It is known that heat is generated during operation of electrolytic capacitors, which is caused by superimposed alternating current, due to dielectric losses. The heat significantly reduces the service life of the capacitor and is therefore harmful.

It is therefore an object of the invention to achieve good heat dissipation in can-type electrolytic capacitors.

This object is achieved according to the invention in that the cylindrical wall of the cup 2 has a recess 8 at its bottom 3.

According to a further embodiment, the cup wall 2 can have an outer bead 4 above the recess 8.

In order to fix the shrink tube 1, which ends in the recess 8 of the cup wall 2, a collar ring 5 can be provided, which rests on the outer bead 4 and
is screwed to the capacitor support 10 by means of screw connections 7, T and 9, 9'.

By means of the screw connections 7, 7' and 9, 9', the heat-conducting foil 6, which rests on the cup base 3, can be advantageously pressed against it.

The attached drawing shows examples of
Electrolytic capacitors are shown and are described in more detail below.
It shows

Figure 1 shows a can electrolytic capacitor in the known form;

Figure 2 a new shape at the lower end of the

capacitor;

Figure 3 another form of the lower end of the
capacitor and

Figure 4 shows a cap ring for capacitors in the
Form according to Figure 3 including support.

In the drawing, the cylindrical part of the aluminum cup is designated 2, which is generally filled with a coil of electrolyte carrier and aluminum foil - forming the electrolytic capacitor.

· insulation, the cylindrical wall of the cup 2 is surrounded by a shrink tube 1 made of PVC. The cup base 3 of the condenser made of aluminum is exposed as shown in Figures 1 to 3. The heat generated in the condenser is dissipated from it to the outside via a heat-conducting foil 6. If the condenser is installed on an open frame, the heat generated can be cooled by a passing air stream.

According to a further embodiment of the invention, the cylindrical part of the cup 2 is provided with an outer bead 4. The shrink tube 1 extends over the outer bead 4 to the recess 8 in front of the cup base 3; it can be attached to the outer bead 4 by means of a collar ring 5.

Fischer and Exchange Capacitors GmbH

The collar ring 5, which is screwed onto the support surface of the capacitor 10 using screw connections 7, 7' and 9, 9', also serves to press the heat-conducting foil 6 onto the cup base 3 through the support surface 10.

Protection claims

F. and T. Capacitors GmbH

Claims (4)

Protection claims: 1.) Electrolytic capacitor arranged in a cup, characterized in that the cylindrical wall of the cup (2) has a recess (8) at its bottom (3). < 2.) Electrolytic capacitor according to claim 1, characterized in that the cup wall (2) has an outer bead (4) above the recess (8), 3.) Electrolytic capacitor according to claim 1 and 2, characterized in that the shrink tube (1) ends in the recess (8) of the cup wall (2) and that the capacitor is attached to the capacitor support (10) by means of an external bead (4) and a collar ring (5) by means of screw connections (7, 7' and 9, 9'). 4.) Electrolytic capacitor according to claims 1-3, characterized in that the heat-conducting foil (6) is pressed onto the cup base (3) by the screw connections (7, 7' and 9, 9') of the collar ring (5) with the capacitor support (10). FST Capacitors GmbH