DE8034128U1 - Bimetal release for a thermally tripping switchgear - Google Patents

Description

Fuji Electric Co., Ltd. My sign

Kawasaki, Japan VPA 79 G 8573 DE

File number G 80 34 128.2

New description pages 1 beef 1a (replace the previous page 1)

/ Bimetal release for a thermally tripping ¹ ^ C switchgear ^

The innovation relates to a bimetal release for a thermally tripping switchgear, consisting of of a bimetallic strip causing the release and a U-shaped strip that is connected to it trained heating conductor with conductors connected electrically in parallel.

In a known switching device of the above type (DE-OS 1 538 640) is punched out as a specialist part, U-shaped heating conductor of the bimetallic strip connected in parallel as a heating conductor. By establishing the ohmic Resistance, the current distribution is made in such a way that that up to a low current strength, about 6 JN with predominantly indirect, above this up to higher currents with predominantly direct heating. Besides that the electrical Connection between the bimetal and the heating conductor not without difficulties with a predeterminable resistance value can be produced, also prepares the coordination of the individual resistors with one another for a Serial production problems. The innovation is therefore based on the task of a bimetal release of the above To create kind that is easy to manufacture and with which a variety of trigger areas under Use of resistors of the same type and shape

La 2 Syr / January 16, 1981

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can be painted over. This is done in an easy way achieved in a bimetal release of the type mentioned above in that the conductor through a between the Legs of the U arranged, on the legs abutting bridging part is formed, which at least Share the U electrically

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is parallel. By the degree of bridging lets The thermal energy available to the bimetallic strip for deflecting depends on the tripping current easily keep the same without having to use separate 5 different parts. Good contact surfaces for electrical connection of the bridging part with the heating conductor result when the U-shaped The heating conductor is designed in the form of a strip and is provided with a hairpin-shaped, angled intermediate part that forms the U and the bridging part rests against parts of the wide inner surface of the U. A fine-tuning of the tripping characteristic can be achieved in a simple manner if two bridging parts from the side edges of the U starting opposite each other. On separate fasteners for the bistro strip under utilization A good heat transfer can be dispensed with if one end of the bimetal strip is on the outside of the one U-leg is attached. As a simple fastening option has turned out to be when the double strip is riveted. A simple holder for the heating conductor results when a holder part for the heating conductor is attached to the inside of the U-leg. This bracket part can together () can be riveted with the double strip. 25th

An exemplary embodiment in accordance with the innovation is described with the aid of the drawing and the mode of operation is explained in more detail.

Show it:

1 shows a perspective illustration of a bimetal arrangement for a circuit breaker, without a bridging part ,

Fig. 2, 3, A, 5 views of a bimetal arrangement according to the innovation with different layers of the

bridging part in side or front ⁽ 'views,

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I Fig. 6 and 7 circuit diagrams of the by bridging

I formed shunted resistances.

ς In the embodiment of FIGS. 2 to 5 is a

I 5 bimetal 3 over rivets on the vertical leg of an in-I vertical U-part of the heat conductor 1 attached, such as

\ This can be seen in more detail from FIG. With 4 is a

I designated the holder part for the resistor 1. the

I bridging parts 5, 5 'of the present innovation

\ 10 attached to the legs of the inverted U-part of the resistance I / Λ of the 1, for example by soldering. In this way: a part of the resistance 1 is through the over-

bridging parts 5, 5 'bridged, i.e. part of the j, resistor 1, a shunt is connected in parallel. in the

t 15 are the bridging parts 5 »5 'with the

I hairpin-shaped angled intermediate part of the

I Standes 1, which forms the U 2, kept in contact.

I An equivalent circuit diagram is shown in FIG. 6, wherein

i only part of the resistance 1 or the U through the

■ 20 bridging parts 5, 5 'are shunted, which have a low

'■ have resistance, so that a relatively high current

is available for heating. According to Fig. 4 and 5, the bridging parts 5, 5 'with low resistance ■ ) was held between the vertical opposing Schen-25 none of the U of the resistor 1 and electrically connected, in a position that is farther from the U- Jetty is away. As a result, almost the entire resistor 1 is shunted by the bridging parts 5, 5 ', as shown in FIG. 7, with the result that only a reduced current is effective for heating

.: "■ is. To get the same amount of heat as the arrangement according to Fig.

2 and 3 or the circuit of Fig. 6 has, with the Wi- ; derstand arrangement according to Fig. 4, 5 or the circuit

7, it is necessary that an increased current flows through the resistor, as i ζ λ, from Fig. 4, 5 can be seen. It can be, depending on the position of _f Uberbrückungsteile same stripe

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Resistance set a large number of tripping currents that have the same amount of heat, i.e. the same tripping paths of the Bimetal 3 cause.

While in the illustrated embodiment, the two bridging parts 5, 5 'between the legs of the U-part standing upside down are arranged and fastened, a single bridging part can also be used Find use. In addition, the position of the attachment of the bridging parts can be changed. The dimensions or materials can also be designed differently to accommodate different currents to cope with that generate the same amount of heat. As previously described, the bimetal arrangement according to FIG Innovation a resistor in the form of a strip, which is used as a heating conductor, and also an inverted, U-shaped part. A bimetal is connected to the heater and is deflectable at one end to provide a trigger mechanism to operate. Short-circuit members are attached between the legs of the U-part to allow the flow of current to shunt through the heating conductor. Accordingly, the same resistance can be used for a plurality of trigger ranges can be used, which brings about a reduction in manufacturing costs. The bridging parts can can be changed in position, arrangement, number and size in order to achieve the same amount of heat with different tripping currents to create.

6 claims for protection

7 figures

Claims (6)

1. Bimetal release for a thermally tripping switchgear, consisting of a tripping device Bimetallic strips and a U-shaped heating conductor connected to this with conductors connected electrically in parallel, characterized in that the Head through a bridging part that is arranged between the legs of the U (2) and rests on the legs (5, 5 ') is formed, which is at least parts of the U (2) electrically parallel. 2. bimetal release according to claim 1, characterized in that the U-shaped The heating conductor (1) is strip-shaped with a hairpin-shaped angled forming the U (2) Intermediate part is provided and the bridging part (5, 5 ') on parts of the wide inner surface of the U is applied. 3. bimetal release according to claim 1 or 2, characterized in that two Bridging parts (5, 5 ') are opposite each other starting from the side edges of the U (2). 4. bimetal release according to claim 1, 2 or 3, there characterized in that the bimetallic strip (3) with one end on the outside of one U (2) leg is attached. January 16, 1981 / La 2 Syr t * ■ * VPA 79 G 8573 DE 5. bimetallic release according to claim 4, characterized in that the bimetal strelfen (3) is riveted. 6. bimetal release according to claim 4 or 5, characterized in that a Bracket part (4) for the heating conductor (1) is attached to the inside of the U (2) leg.