RU199547U1 - Automatic breaker trip rail - Google Patents

Abstract

The utility model relates to electrical engineering, in particular, an automatic circuit breaker trip rail. The trip rail of the automatic circuit breaker, interacting with the free trip mechanism, is made in the form of a metal axis with figured segments fixed on it from electrical high-temperature plastic with protrusions, each of which is placed with the possibility of interacting with the corresponding thermal and electromagnetic releases. The first segment of the shutdown rail is additionally equipped with a ledge with a platform for acting on it with a test button. The second segment with the ability to support the clamps of the free release mechanism on it. The metal axis at the junctions with the shaped segments made of electrical high-temperature plastic is made with knurling in the form of uniformly alternating protrusions and depressions and is heat-treated. The technical result is the creation of a device that ensures reliable operation of the free release mechanism in any permissible operating modes. 8 ill.

Description

The utility model relates to electrical engineering, in particular, an automatic circuit breaker trip rail.

The rail is designed to turn off the automatic circuit breaker in case of overloads, short-circuit currents or other additional devices by activating the free tripping mechanism of the automatic circuit breaker, as well as to prepare the free tripping mechanism for closing after tripping.

From the prior art, an automatic circuit breaker is known according to RF patent No. 65293, IPC N01N73 / 48, 2007.07.27, containing a housing with a cover, a free release mechanism with a rail and a bracket, a contact system with a movable contact and arcing chambers, a thermal release, and an electromagnetic release of the maximum current in each pole, activating the free release mechanism by mechanical interaction with the corresponding projection of the trip rail.

An automatic switch is known, containing an emergency shutdown rail of an automatic switch (patent No. 157488, IPC Н01Н73 / 02, 2015.12.10), made with the possibility of interacting with a free release mechanism, in the form of a metal axis with segments fixed on it made of electrical high-temperature plastic, with protrusions for interaction with the corresponding thermal and electromagnetic release, while the first segment of the emergency shutdown rail is equipped with a protrusion with a test button action area, the protrusion of the second segment is configured to support the brackets of the free-release mechanism in the cocked position of the circuit breaker.

The disadvantage of the known technical solution is the insufficiently reliable connection of the metal axis with the segments made of electrical high-temperature plastic, which can cause scrolling of the segments relative to the metal axis when the releases are acting on them, leading to the impossibility of turning off the free release mechanism in emergency modes.

The objective of the claimed utility model is to create a circuit breaker trip rail, designed to activate the mechanism for free tripping of automatic shutdown, which excludes the possibility of scrolling the segments made of electrical high-temperature plastic, with the achievement of such a technical result as increasing the reliability of fastening the segments on the metal axis, which renders a significant impact on the reliability of operation of the free-release mechanism in any permissible operating modes.

The technical result to be achieved by the utility model is the creation of a device that ensures reliable operation of the free-release mechanism in any permissible operating modes.

To prevent such scrolling, that is, to achieve the specified technical result, it is proposed to provide on the metal axis a knurling made in the form of uniformly alternating protrusions and depressions at the junctions with the segments made of electrical high-temperature plastic. In addition, to ensure the stable operation of the automatic circuit breaker shutdown rail and to increase its rigidity, the metal axis is heat treated.

The technical result is achieved due to the fact that the trip rail of the automatic circuit breaker, made with the possibility of interaction with the free-release mechanism, is made in the form of a metal axis with segments fixed on it made of electrical high-temperature plastic with protrusions, each of which is arranged with the possibility of interaction with the corresponding thermal and electromagnetic releases , while the first segment of the shutdown rail is additionally equipped with a protrusion with a platform for the action of the test button on it, the second segment with the possibility of supporting the brackets of the free release mechanism on it, characterized in that the metal axis at the junctions with the segments made of electrical high-temperature plastic is knurled in the form evenly alternating ridges and depressions and heat treated.

The utility model is illustrated by the following graphic materials:

in fig. 1 - shows the rail for disconnecting the automatic circuit breaker in perspective, general view from the side of the free release mechanism;

in fig. 2 - shows the trip rail of the automatic circuit breaker, view from the side of the free-release mechanism with a cutout;

in fig. 3 - shows the rail for disconnecting the automatic circuit breaker, top view;

in fig. 4 shows a section A-A in Fig. 2;

in fig. 5 - shows a section b-b in Fig. 2;

in fig. 6 shows a section b-b in fig. 2;

in fig. 7 - shows a cutaway circuit breaker;

in fig. 8 shows a view D of FIG. 7.

The trip rail 1 of the automatic circuit breaker is made in the form of a metal axis 2 with segments 3, 4 and 5 fixed on it from electrical high-temperature plastic, with protrusions 6 and 7 (see Figs. 1, 2, 3).

The metal axis 2 at the points of fixing the segments 3, 4 and 5 is made with knurling (see Figs. 2, 4, 5, 6) in the form of uniformly alternating protrusions and depressions and subjected to heat treatment.

The protrusion of the first segment 3 of the trip rail 1 (see Figs. 1, 2) has a groove 9 made with the possibility of engaging the shunt release (not shown in the drawings).

The second segment 4 of the trip rail 1 is made with the possibility of supporting on it the brackets 10 of the free release mechanism 11 in the cocked position of the automatic switch (see Figs. 1, 3, 5, 7, 8).

The protrusion 6 of the third segment 5 of the shutdown rail 1 is provided with a protrusion with a platform 8 for acting on it with a test button (see Fig. 1, 2, 3, 6).

Segments 3, 4, 5 of electrical high-temperature plastic are made with protrusions 6 and 7 (see Fig. 1, 2, 3, 4, 5, 6). The protrusions 6 are designed to interact with the corresponding thermal releases 12, and the protrusions 7 are made to interact with the corresponding electromagnetic releases 13 (see Fig. 7).

In case of operation of any of the protective devices: thermal 12 or electromagnetic 13 releases, axis 2 with segments 3, 4, 5 of the trip rail 1 rotates, which leads to the break of the bracket 10 from the protrusion 6 of segment 4, after which the free release mechanism 11 is triggered and turns off the circuit breaker.

The device works as follows.

The electromagnetic release 13, when a short-circuit current flows, mechanically acts on the protrusion 7 of the trip rail 1. The trip rail 1 turns counterclockwise and the free trip mechanism 11 is triggered, which opens the movable 14 and fixed contacts.

After triggering the free tripping mechanism 11, the circuit breaker is ready for a repeated “charge-close” cycle.

Protection against overload currents is carried out by thermal releases 12, which, being deformed by the action of overload currents, mechanically act on the projections 6 of the shutdown rail 1, the shutdown rail 1 rotates, resulting in automatic shutdown.

Checking the operability of the automatic circuit breaker under operating conditions is carried out by a test button located on the front side of the cover of the circuit breaker (not shown in the drawings) and interacting with the protrusion with the platform 8 of segment 5, as a result of which automatic shutdown occurs.

Remote tripping of the automatic circuit breaker in operation is carried out using an independent release (not shown in the drawings), which acts on the trip rail 1, as a result of which an automatic trip occurs.

Claims (1)

The trip rail of the automatic circuit breaker, interacting with the free trip mechanism, is made in the form of a metal axis with segments fixed on it made of electrical high-temperature plastic with protrusions, each of which is arranged with the possibility of interaction with the corresponding thermal and electromagnetic releases, while the first segment of the trip rail is additionally equipped a protrusion with a platform for influencing a test button on it, the second segment with the ability to support the brackets of the free release mechanism on it, characterized in that the metal axis at the junctions with the segments made of electrical high-temperature plastic is knurled in the form of uniformly alternating protrusions and depressions and is subjected to thermal processing.

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