EA008953B1 - Electromagnetic trip device and electrical switch gear apparatus comprising same - Google Patents

Abstract

The present invention relates to an electromagnetic trip device in particular for y differential switch or circuit breaker, comprising U-shaped armature A the ends whereof form two polar surfaces (7,8), a vane (1) pivoting with respect to the armature A and able to be moved onto said polar surfaces (7,8) to close the magnetic circuit formed by the armature A and vane (1), a permanent magnet for polarising the magnetic circuit designed to hold the vane on the polar surfaces (7,8), a trip coil surrounding the magnetic circuit and able to counteract the force of the magnet so as to move the vane (1), a resetting pin (15) of the vane (1), and a blade (10) fixed on the vane (1) designed to dampen the impact of the resetting forces. This trip device is characterized in that the above-mentioned blade (10) comprises articulation pivots (24,25) for articulation of the vane (1) with respect to the armature A. The blade (10) also comprises a part in the form of a latch (30) designed to enable latching of a spring (9) performing biasing of the vane (1) away from the polar surfaces (7,8) of the armature A against the action of the permanent magnet.

Description

The present invention relates to an electromagnetic opening device containing a образ-shaped anchor, the ends of which form two polar surfaces, a blade rotating relative to the armature with the ability to move to said polar surfaces to close the magnetic circuit formed by the anchor and blade, a permanent magnet for polarizing the magnetic circuit, an opening coil, covering the magnetic circuit and able to counteract the force of the magnet to move the blade, the blade’s resetting rod, the knife designed to extinguishing the impact of the forces of relief and recoil of the blade.

Prior art

Many electromagnetic opening devices, for example, disclosed in patents EP 911850, EP 829895 and 4110660, do not have devices designed to dampen the effects of resetting forces.

In the patent 28 3528470 disclosed a device opening, containing the damping device with a knife. However, in this device, the rotation of the blade is achieved by an additional part placed between the blade and the anchor, and the spring is fixed on the protruding part formed on the blade, therefore the assembly is a complex structure.

Summary of the Invention

The technical task of the present invention is to create a device opening, which has a simplified design, and switching equipment containing this device.

The task is solved according to the present invention by creating a device opening a previously reduced form, which is characterized by the fact that the above-mentioned knife contains the hinged joints of the blade relative to the armature.

According to a particular embodiment of the invention, the knife comprises two tabs protruding from each side of the blade and containing articulated joints.

In a particular embodiment, the lugs are located in planes perpendicular to the main plane of the knife.

Mostly ears and articulations are cast together with the blade.

According to the invention, two tabs are placed in a groove provided at the end of one of the wings of the anchor.

According to the invention, the hinges are formed by angular parts formed on the ears and working together with the inner wall located in the groove.

According to the invention, the angle is chosen so as to limit the opening of the blade during assembly of the opening device.

The knife according to the invention contains a part in the form of a “dog” of the lock, designed to fix the spring, which ensures the displacement of the blade from the polar surfaces of the armature and counteracting the effect of a permanent magnet.

The knife contains a stop that restricts the movement of the blade towards the side opposite to the hinge joint.

Preferably, the stop is formed by two knife edges, respectively, belonging to two slots provided on each side of the knife and intended to receive, respectively, two branches located at the end of one of the wings of the armature, with respect to which the blade of the blade is hinged.

According to another feature, the knife has the shape of an arc of a circle, the radius of which ensures the displacement of the blade to the rear stop of its articulated joint when resetting by means of a rod.

According to the invention, the above-mentioned lugs, respectively, comprise two round protrusions opposite one another, located on the inner sides of said lugs and located in the aforementioned cuts; These round protrusions are designed for lateral positioning of the blade and the knife relative to the anchor.

Another object of the present invention is to provide switching equipment comprising a disconnecting device comprising the aforementioned features taken individually or in combination.

Brief Description of the Drawings

Other advantages and features of the invention are explained in the following detailed description with reference to the accompanying drawings, in which:

FIG. 1 shows a side view of a switching device in a laden state according to the invention;

FIG. 2 is a top view of a knife, which is a damping knife according to the invention;

FIG. 3 is a side view of a damping knife according to the invention.

- 1 008953

Detailed Description of the Preferred Embodiment of the Invention

FIG. 1 shows a highly sensitive electromagnetic opening device for combining with a differential switch. The opening device contains a ϋ-shaped anchor A and a rotating blade 1. The anchor A contains a base 2 and two wings 5, 6. The blade 1 is pivotally connected to the end 8 of the wing 6 of the anchor A. In the loaded condition of the disconnecting device Ό the blade 1 presses on the ends 7, 8 wings 5, 6, forming two polar surfaces. The coil sleeve B is located around one of the wings of the armature A. A permanent magnet P for polarizing the armature A is placed between the wings 5, 6 to hold the blade 1 in a position attracted to the polar surfaces 7, 8, counteracting the return force of the spring 9. Such an opening device It is well known, but it should be recalled that the opening of the blade 1 occurs when the coil is excited, which removes the attraction of the blade 1 by a permanent magnet, as a result of which the blade 1 is displaced by the return spring from the polar surfaces it has 7, 8 anchors A. This movement of the blade 1 leads to the opening of the electric circuit.

The opening device содержит also contains a knife 10 reset or return to its original position, fixed on the blade 1 at the level of the end 12, i.e. one of the opposite ends of the 11, 12 blades 1. Two ends 13, 14 of the knife 10 press on the blade 1 at the level polar surfaces 7, 8, to distribute the forces of the discharge and thus prevent the deformation of the blade 1, which is undesirable for the functional properties of the opening device Ό. The knife 10 allows you to extinguish the impact of the forces of discharge generated by the reset rod 15 during the reset operations so that the blade 1 returns to its original position after the reset operation.

FIG. 2 and 3 it is shown that the knife 10 is formed by a part of a slightly convex shape 16, from which two ears 17, 18 extend, in a plane perpendicular to the main plane of the knife 10. The knife 10 also contains two slots 19, 20 located opposite one another relative to the axis of the knife 10 and each extending along one of the longitudinal edges 21, 22 of the knife 10 towards the central axis of the knife 10. FIG. 1 shows that the wing 6 of the armature A at the hinge of the blade 1 is limited to two branches 23 (only one of them is shown). The slots 19, 20 of the knife 10 are designed to receive one of the branches 23 of the armature 6. Each of the two ears 17, 18 of the knife 10 contains a corner part 24, 25, forming a hinge, designed to work together with the inner surface 32 of the branches 23, and placed in the groove 31, provided at the end of the wing 6.

One of the edges 26, 27 of each slot 19, 20, located on the same side as the hinge joint, is formed by a back stop 28, designed to limit the forward movement of the blade 1, i.e. movement in the direction opposite to the hinge. In this way, optimal positioning of the blade 1 is guaranteed when it is articulated and in relation to the polar surfaces 7, 8.

Each of the lugs 17, 18 has on its inner surface a circular protrusion 29, 34, running towards the central axis of the knife 10 and performing the lateral positioning of the knife 10.

Lateral positioning is performed by points on a flat plate without polar surfaces and without the formation of burrs.

The knife 10 also has a portion of a specific shape 30 intended for fixing the spring.

9. The knife 10 is made of a material selected for its plasticity, non-magnetic, anti-corrosion properties and suitability for laser welding.

The lugs 17, 18 supporting the pivot joints 24, 25 have an angle of 35, chosen to limit the opening of the blade 1 during assembly.

The knife 10 has the shape of an arc of a circle, the radius of which is, for example, P35. so as to shift the blade 1 to the rear support of the swivel 28, when the reset is performed by means of the rod 15.

The shape of the knife 10 is obtained by cutting, bending and stamping a single piece. This workpiece is welded to the blade of the relay using laser welding.

During normal operation, the blade is held against the polar surfaces of the armature with a permanent magnet. In the event of an emergency in an electrical circuit in which the disconnecting device is integrated, an electric current flows through the coil, which counteracts the forces of attraction of the magnet. The paddle is then shifted by the return spring to the position from the anchor.

During this movement, the blade rotates around an axis formed by hinges attached to the ears of the knife, working in conjunction with the surface of the branches of one of the wings of the anchor. When the reset operation is completed, the blade is shifted to the rear stop of the articulation and returns to its original position under the action of the knife.

Thus, the claimed invention is an electromagnetic device for opening a simple design, comprising a device for protecting the blade from deformation when the relay is reset by means of a rod. This device in the form of a single design serves as a means of securing the spring, articulation, stop, lateral positioning, longitudinal positioning, limiting the opening angle, damping device and force distributor on magnetic poles.

- 2 008953

The invention is, of course, not limited to the examples described and illustrated.

On the contrary, the invention concerns all technical equivalents of the described mechanisms, as well as their combinations.

In particular, according to the present invention, an electrical switching apparatus is proposed that includes a disconnecting device comprising the above-mentioned features, taken individually or in combination.

According to the invention, there is also proposed a differential switch comprising a disconnecting device comprising the above-mentioned features taken individually or in combination.

Claims (14)

1. An electromagnetic opening device containing a ϋ-shaped armature, the ends of which form two polar surfaces, a blade mounted to rotate relative to the armature and move to the polar surfaces to close the magnetic circuit formed by the armature and the blade, a permanent magnet to polarize the magnetic circuit, coil opening, covering the magnetic circuit and capable of counteracting the force of the magnet to move the blade, the blade drop rod, the knife mounted on the blade and designed for slacks I impact strength reset and return the blade spring, characterized in that the knife (10) comprises a hinge (24, 25) of articulation of the blade (1) with an anchor A. 2. The opening device according to claim 1, characterized in that the knife (10) contains two ears (17, 18) protruding from each side of the blade (1) and containing hinges (24, 25) of the joint. 3. The opening device according to any one of claims 1, 2, characterized in that the ears (17, 18) are located in planes substantially perpendicular to the main plane of the knife (10). 4. The opening device according to any one of paragraphs.2, 3, characterized in that the ears (17, 18) and joints (24, 25) of the joint are made in one piece with a knife (10). 5. An opening device according to any one of claims 2 to 4, characterized in that two ears (17, 18) are placed in a groove (31) made at the end of one of the wings (5, 6) of the armature A. 6. The opening device according to claim 5, characterized in that the hinges (24, 25) are formed by the angular parts of the ears (17, 18) and function together with the inner wall (32) located in the groove (31). 7. The opening device according to claim 6, characterized in that the angle (35) of the corner parts is selected so as to limit the opening of the blade (1) during assembly of the opening device Ό. 8. The opening device according to any one of claims 1 to 7, characterized in that the knife (10) contains a part in the form of a "dog" of the lock (30), designed to fix the spring (9), providing the displacement of the blade (1) from the polar surfaces (7, 8) anchors A and to counter the action of a permanent magnet. 9. The opening device according to any one of claims 1 to 8, characterized in that the knife (10) contains a stop (28) restricting the movement of the blade (1) in the direction opposite to the hinges (24, 25, 32) of the joint. 10. The opening device according to claim 9, characterized in that the stop (28) is formed by two edges (26, 27) of the knife (10), respectively, belonging to two slots (19, 20) provided on each side of the knife (10), and is designed to receive two branches (23) located at the end of one of the wings (5, 6) of the armature A, to which the specified blade (10) is pivotally attached. 11. The opening device according to any one of claims 1 to 10, characterized in that the knife (10) has the shape of a circular arc, the radius of which is defined so as to ensure the displacement of the blades (1) to the rear stop of the joints (24, 25, 32) when a reset (reset) is performed by the rod (15). 12. The opening device according to claim 10, characterized in that the ears (17, 18), respectively, contain two round protrusions (29, 34), one opposite each other, located respectively on the inner sides of the ears (17, 18), placed in the slots (19, 20) and intended for lateral positioning of the blades (1) and knife (10) relative to the armature A. 13. An electrical switching apparatus comprising an opening device according to any one of the preceding claims. 14. A differential switch comprising an opening device according to any one of the preceding paragraphs.