RU208138U9 - High-speed electromagnetic contactor - Google Patents

Abstract

The utility model relates to a direct current contactor and can be widely used in urban electric transport and electric networks, railway networks and locomotives for disconnecting loads and opening electrical circuits with high currents or high voltages. The technical result, which consists in providing a quick opening of the power electrical circuit, increasing the efficiency of arcing and increasing reliability by reducing the opening time, reducing heat generation during arcing in the arc chute, which in turn affects the wear resistance of the contactor parts and, as a result, the reliability of the contactor, is achieved by a high-speed electromagnetic contactor operating on direct current, assembled in a housing and containing at least two contact parts with fixed and moving contacts, two permanent magnets located near each of the contact parts and creating a magnetic arc-quenching field, and two coils placed near each of the contact parts and designed to create an electromagnetic arcing field to draw in arcs that occur when the contact parts are opened, an arc guide is placed near each contact part, isolated from the fixed contacts, and accordingly the operating coil is electrically connected to the fixed contact and the arc guide, while the electromagnetic drive contains an armature that moves from the lower position to the upper position when turned on and back when turned off, inside which there is a rod and an unblocking device, with which it is possible to disconnect the connection between the armature and a stem with a contact holder, opening at the upper position of the armature, so that the contact holder is made with the possibility of being transferred independently of the armature from the closed position to the open position in a shorter time. 2 ill.

Description

The utility model relates to a direct current contactor and can be widely used in urban electric transport and electric networks, railway networks and locomotives for disconnecting loads and opening electrical circuits with high currents or high voltages. A contactor is known, patent [1], in which, for quick disconnection, there is an unblocking device by which it is possible to disconnect for connection between the armature and the contact holder when the armature is retracted, so that the contact holder is made capable of being transferred independently from the armature from the closed position to the open position; the contactor is also equipped with a conventional arc extinguishing device and a fast actuating device based on the principle of induction of eddy currents, which are formed in an aluminum disk used as an actuating armature; also has an actuating coil with a bank of capacitors to power it: it also includes control electronics for detecting the current characteristic in the power circuit and for triggering an unblocking device when a certain threshold current is reached.

The disadvantages of the known technical solution are due to its design and are as follows: the use of a conventional arc extinguishing device, the installation of control electronics in a single construct, which can fail when exposed to high voltage. One type of high-speed actuator is used.

Known contactor, patent [2], for operation on direct and alternating current, equipped with at least one contact part, consisting of a fixed contact and a movable contact; at least one permanent magnet placed near the contact piece and designed to create a permanent magnetic arc-quenching field, and at least one coil placed near the contact-piece and designed to create an electromagnetic arc-quenching field to draw in the arc that occurs when the contact piece opens into at least one arc chute, wherein the permanent magnets associated with the two contact pieces are polarized in opposite directions. At the same time, a guide for the arc is placed near each contact-piece, isolated from the fixed contacts, and the corresponding one is electrically connected to the corresponding fixed contact and the corresponding guide for the arc.

The disadvantages of the known technical solution are due to its design and are as follows: there is no rod inside the armature of the electromagnetic drive and an unlocking device with a high-speed actuator. At the same time, the implementation of the contactor with one arc chute significantly worsens the conditions for extinguishing the two contact parts formed during the opening, because both arcs are extinguished by one arc chute, which reduces the efficiency of arc extinguishing.

Thus, the main disadvantage of the known contactor is the insufficient efficiency of arc extinguishing and the low reliability of the device as a whole.

The objective of the utility model is to increase the speed of opening the contactor and the possibility of using high-speed actuators of various types, to reduce heat generation during arcing, which will positively affect the efficiency of arcing and the speed of opening and reliability of the contactor.

EFFECT: ensuring quick opening of the power electrical circuit, increasing the efficiency of arcing and increasing reliability by reducing the opening time, reducing heat generation during arcing in the arcing chamber, which in turn affects the wear resistance of the contactor parts and, as a result, the reliability of the contactor.

The problem is solved by the fact that the high-speed electromagnetic contactor, operating on direct current, assembled in a housing and containing at least two contact parts with fixed and moving contacts, two permanent magnets placed near each of the contact parts and creating a magnetic arc-quenching field, and two coils located near each of the contact parts and designed to create an electromagnetic arcing field to draw in arcs that occur when the contact parts are opened, an arc guide is placed near each contact part, isolated from the fixed contacts, and the corresponding coil is electrically connected to ACCORDING TO THE UTILITY MODEL, the electromagnetic drive contains an armature that moves from the lower position to the upper one when turned on and back when turned off, inside which a rod and an unblocking device are located, with the help of which it is possible to disconnect the connection between for the armature and the stem with the contact holder, opening at the upper position of the armature, so that the contact holder is made capable of being moved independently of the armature from the closed position to the open position in a shorter time.

The inventive contactor is novel in comparison with the prototype, differing from it in such essential features: the electromagnetic drive is made with a rod inside the armature and an unblocking device, which makes it possible to disconnect the connection between the armature and the contact holder by means of the rod with the armature retracted - in the upper position of the armature, so that the contact carrier is movable independently of the armature from a closed position to an open position. Reliability is increased by reducing the opening time and, as a result, reducing the time of exposure to high-temperature electric arcs, there is no specific high-speed device, which allows the use of high-speed actuators of various types (and principles of operation). The type and principle of operation of a high-speed actuator is determined by the consumer based on the operating conditions.

The claimed utility model can be widely used in urban electric transport and power networks, railway networks and locomotives for disconnecting loads and opening electrical circuits with high currents or high voltages, and therefore meets the criterion of "industrial applicability".

The utility model is illustrated by drawings, where they are presented on:

Fig. 1 - general view of the contactor assembly;

Fig. 2 - front view of the contactor with the sidewalls of the electromagnetic drive removed and the fixed contacts of the arc extinguishing chamber.

In FIG. 1 shows an image of a high-speed electromagnetic contactor proposed in the utility model. The high-speed electromagnetic contactor proposed in the utility model consists of an arc extinguishing chamber 1 (up to 2 pieces) with two fixed contacts 3 and an electromagnetic drive assembly 2 with a coil 5 and an armature 4.

In FIG. 2 shows a sectional view of the electromagnetic drive proposed in the utility model of the contactor. The high-speed electromagnetic contactor contains an armature 4 with a rod 6 in the lower position, while the self-aligning due to the spring 15, movable contact 14, fixed on the holder 7, and two fixed contacts 3 electrically isolated from each other and located in the arc extinguishing chamber are open. Rod 6, on the upper part of which a holder 7 with a flange 8 of an insulating material is pressed, and in the lower part a groove of smaller diameter 9 is made in which the rod rests on the platform 13 of the blocking element 12, with a spring 16 placed in the anchor 4 with the possibility of movement, but under the action the springs 10 are pressed against the platform 13 of the blocking element 12 with the hole 11. The blocking element is placed for movement in the hole of the anchor 4, made in its lower part, perpendicular to the common axis of the rod and the anchor. In the upper part of the electromagnetic drive there is a stop 17 for armature 4.

High-speed electromagnetic contactor operates as follows. When the contactor is turned on, the coil 5 is activated, the armature 4 with the rod 6 moves to the upper position until it stops 17 and closes the self-aligning, due to the compression spring 15, fixed on the holder 7, the movable contact 14 into two fixed contacts 3 electrically isolated from each other until they close and located in the arc extinguishing chamber, while the springs 10 are additionally compressed.

The contactor can be disconnected in two ways. In the first method, the power to the coil of the electromagnetic drive assembly is turned off, while a small time delay occurs between the drive being turned off and the contacts opening due to the induction of currents in the coil and the occurrence of an electric arc when the contactor opens under current load. As a result, the armature will return from the upper position to the lower position and open contacts 3 and 15.

In the second method, the opening of the contacts occurs after the blocking element 12 moves to the right under the action of a high-speed actuator (not shown in Fig. 2, selected by the consumer), while the rod 6 with a lower groove of a smaller diameter 9 will pass through the transverse hole 11 made in the blocking element 12 and will open the main contacts in the shortest possible time compared to the first method.

It is possible that even after the power supply of the coil of the drive of the electromagnetic and mechanical opening of the contacts, with the appearance of a gap, there is no electrical opening of the contacts due to the occurrence of an electric arc when opening the contactors under current load. As soon as the magnetic field inducing currents in the coil decreases so much that the return force of the springs is greater, the contactors open, the armature returns to the lower position. The spring 16 ensures that the blocking element 12 moves to the left, back to the blocking position, in which the rod 6 rests on the platform 13 with a groove of a smaller diameter 9 and thus the anchor 4 is automatically connected to the rod 6.

In comparison with the prototype, the claimed contactor is more efficient in arc extinguishing and more reliable in operation.

Sources of information:

1. Patent RU No. 2599380, IPC H01N 50/64, application date 08/04/2015, publication date 10/10/2016.

2. Patent RU No. 2417475, IPC H01N 9/44, application date 07/26/2007, publication date 04/27/2011.

Claims (1)

High-speed electromagnetic contactor, operating on direct current, assembled in a housing and containing at least two contact parts with fixed and moving contacts, two permanent magnets located near each of the contact parts and creating a magnetic arc-extinguishing field, and two coils placed near each of the contact parts and designed to create an electromagnetic arc-suppressing field for drawing in arcs that occur when the contact parts are opened, an arc guide is placed near each contact part, isolated from the fixed contacts, and the corresponding coil is electrically connected to the fixed contact and the arc guide , characterized in that the electromagnetic drive contains an armature that moves from the lower position to the upper position when turned on and back when turned off, inside which a rod and an unlocking device are placed, with which it is possible to disconnect the connection between the armature and the rod with the contact holder, opening at the top position of the armature, so that the contact holder is capable of being moved independently of the armature from the closed position to the open position in a shorter time.

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