SI9400271A - Electromagnetic relay - Google Patents

Abstract

The invention concerns an electromagnetic contactor element which makes it possible to connect or commutate various electric apparatus and devices and makes it possible e.g. to switch on, start and control the operation of asynchronous electromotors, for which several contactors and a time-lag relay are normally required. The electromagnetic contactor element in accordance with the invention is basically composed of three spatially and functionally separated parts, namely a driving part (A), a contact part (B) and a part (C) which can contain an electronic circuit, and all three parts are covered by a common cover (2). Two coils (7, 7') are installed in the driving part (A) which have a common moving core (8), while a fixed core (6) is installed in the casing (1), and a fixed core (6') in the cover (2), whereby a longitudinally moving steel support (9) is linked with said moving core (8) and over a transmission lever (10) also with a longitudinally moving support (18) of contacts which lies in grooves (20). Springs (19) are inserted in such a way as to hold moving contacts (17) in the contact part (B) and the common core (8) in the driving part (A) in a neutral position.

Description

ELECTROMAGNETIC CONTACTOR

ELEMENT

The subject of the invention is an electromagnetic contactor element that enables connection or switching of various electrical appliances and appliances, e.g. switching on, starting and operating of asynchronous electric motors where it is necessary to use more contactors and time relay. The invention generally belongs to the class H 01 H, or. for details of Class H01H 03/46 of the International Patent Classification.

The technical problem will be explained in the specific case controlled or. switching on the asynchronous electric motor, which does not limit the use

-2 of the invention in other fields. A technical problem that the present invention successfully solves is the construction and implementation of such a switching element, which will allow the successful replacement of several switching contactors, especially in applications where one element can replace a combination of two or three contactors, which according to the present solutions are needed and form an assembly where the power and control parts between the contactors must be properly connected to the conductors, otherwise the assembly may be damaged or even destroyed.

Known solutions that solve a technical problem, e.g. Starting and operating electric motors with power exceeding 4 KW, contain a star-triangle assembly consisting of three classic contactors and a time relay for switching from star to triangle position. In order for the assembly to function properly, the power contacts of all three contactors must be properly connected to each other, which is physically more feasible in the case of higher power sets, since these are larger cross sections of hydrogen.

The electromagnetic contactor element according to the invention consists essentially of three spatially and functionally mounted parts, namely a drive part, a contact part and an electronic circuit portion, all three parts of which are covered by a common covering part with fixing means which after covering the cover part, they jump into the grooves of the housing and thus close the electromagnetic contactor element itself.

The electromagnetic contactor element of the invention will be explained in greater detail on the basis of an embodiment and figures, of which:

3 is a cross-sectional view and side view of an electromagnetic contactor element according to the invention;

Figure 2 is an electromagnetic contactor element according to the invention in cross section A-A;

Figure 3 shows the electromagnetic contactor element of the invention in cross-section B-B and a plan view of the position of the support and contacts according to the first embodiment;

Figure 4 shows an electromagnetic contactor element according to the invention in cross-section B-B and a plan view of the position of the support and contacts according to the second embodiment;

Fig. 5 is an electromagnetic contactor element according to the invention and a top view in partial cross-section.

The electromagnetic contactor element consists of three main parts, A drive, B - contact and C - electronic part, housing 1, which closes with a cover part 2, on which are also the fastening means 3, which, when installed, jump into the grooves on the housing 4 and they also cause the electromagnetic contactor element to close. The position of the electromagnetic contactor element is signaled by two light-emitting diodes 33, which are mounted on the cover portion 2 of the element by means of a potentiometer 32, the star position is red and the triangle green position is diode.

In the drive section A, special coil loops 5.5 'attach two coils 7.7' to a fixed core 6.6 'having a common movable core 8 via

-4 which force is transmitted to the contact portion B by means of the steel support 9 and the transfer lever 10. One fixed core 6 is housed in the housing 1 and another fixed core 6 'in the cover 2 of the electromagnetic contactor element. The cores 6,6 'are inserted into the grooves of the housing of the drive part 11, under which are mounted leaf springs 12 which dampen vibrations during start-ups, and at the same time their design allows the cores 6,6' to be mounted in the housing of the electromagnetic contactor element 1, 2 such that they lock into the grooves 13 on the cores themselves when inserting the cores 6,6 '. Between the 7.7 'coil coils and the 6.6' fixed cores, there is a lining 14 made of, for example, a thin rubber that protects the 7.7 'coil coil from damage from vibration shifts. The common core 8, which hovers between the two coils 7,7 ', has on the sides a groove 15 in which lies a steel support 9 through which the movement of the core 8 is transmitted to the lower part of the electromagnetic contactor element to which the transmission lever 10 is attached, which it transfers this movement from drive part A to contact part B.

Contact part B, which in the present embodiment consists of nine fixed and nine moving contacts, is located in the middle of the electromagnetic contactor element of the invention. Supply contacts 16 - L1, L2, L3 are mounted on one side and discharge contacts U, V, W and Z, X, Y on the other side of contact part B. The movable contacts 17 are mounted on a separate, movable carrier 18, which in the neutral positions hold four springs 19 so that the moving contacts 17 at rest are sufficiently spaced from the fixed contacts 16. The carrier 18 moves along two grooves 20, which house springs 19, which at the same time hold the movable common core 8 in. drive part of electromagnetic contactor element A via

5 of the lever 10, which connects the contact part B and the drive part A. The movable contacts 17 are inserted into the openings 21 of the carrier 18 and fastened with springs 22, which, when switched on, provide a sufficiently strong and reliable contact. The mid-moving contacts 17 have a dual function so that they are active in the star position as well as in the triangle position and have contact points 23 on either side of the contact pads 24.

The outlet fixed contacts U, V, W and Z, X, Y are inserted in the housing 1 so that their contact points 25 extend in the middle between the moving contacts 17 so deep that they are covered by the contact points of the moving contacts 23. Supply L1, L2 And L3 are constructed such that each contact has two contact points, which also extend in the middle between the movable contacts 17. The hub 26 is mounted on an insulating support tooth 27 which lies above the feed fixed contacts 16. The outer parts of the fixed contacts 16 are made with screws and spring contact pads 28.

A transfer lever 10 is provided at the bottom of the electromagnetic contactor element, which transfers the force from the drive part A to the contact part B of the electromagnetic contactor element. There are elongated holes 29 on each side of the lever, through which the bolts 30 slide. The transmission lever 10 moves about its axis 31, which is fixed to the lower part of the element according to the invention.

In electronic part C, a time relay may be installed to adjust the switching time from star position a to triangle position b. A potentiometer 32 for setting the time and two LEDs 33 for signaling the position of the electromagnetic contactor element are mounted on the

-6 the cover part 2 of the electromagnetic contactor element. The connection between the time relay and the coils 7,7 'in the drive part A is made with wires running under the cover part 2 of the electromagnetic contactor element.

The electromagnetic contactor element is controlled like any classical element, and the terminals 34 are made with faston pins. The conductor N is connected directly to the element and indirectly via phase switch L. The phase switch L. is switched on via the switch with the phase impulse L 'to activate the operation of the electromagnetic contactor element. Terminals 1-2-3 serve as auxiliary contacts.

When the electromagnetic contactor element is switched on via a time relay, the coil 7 is attracted to the moving core 8, where the moving carrier 18 moves from neutral to position a with contacts 17, and the current from supply contacts L1, L2 and L3 flows through moving contacts 17 to contacts U, V , W, and through the winding back to the contacts of the electromagnetic contactor element Z, X, Y, where a hub 26 is closed through the moving contactors 35 and the motor reaches up to 70% of rated speed. When the start time expires, the time relay switches off the coil 7 and switches on the coil 7 ', after which the moving carrier 18 moves with contacts to position b and the current flows from the inlets to contacts Z, X, Y. The motor is powered from two sides (triangular). it receives a response voltage, thus rated speed, and thus can be operated permanently. When the coil is switched off 7 'it loses control voltage, and the springs 19 equalize the force, pushing the moving parts to the neutral position, which also eliminates the electromagnetic contactor element.

-7Contact part B is protected against interfacial short circuits by phase field subdivisions 36. The mounting of the electromagnetic contactor element can be carried out with screws 37, or it can also be attached to the supporting lath in a known manner.

The proposed implementation of the electromagnetic contactor element provides another application for controlling the operation of the electric motor. To operate an electric motor with two speeds and one winding (Dahlander winding 2/4 or 4/8 poles) according to the solutions so far, we use three interconnected contactors, which form one assembly - two for higher and one for lower speed. The present electromagnetic contactor element of the invention allows us to control such an electric motor using a single element. The drive part A is the same as for the electromagnetic contactor element star - triangle, and the contact part B (which is also shown in Figure 4) differs in the number of contacts as well as in function. In the electronic part C of this electromagnetic contactor element there is an auxiliary relay, through which the coils 7 and 7 'are controlled in the drive part A, which also determines a higher or lower speed of rotation of the motor. The electromagnetic contactor element is controlled in the same way as a classic Dahlander assembly, with two higher and lower speed buttons and a shut-off button to switch off the electromagnetic contactor element.

When the electromagnetic contactor element is switched to the lowest speed, the coil 7 moves the moving core 8 in the drive part A, the moving carrier 18 with the contacts moves to position a, whereby the current from the feed fixed contacts L1, L2 and L3 flows through the moving 17 to the contacts U1 , V1 and W1, then the engine

-8 runs at low speeds and can thus be operated permanently. When the electromagnetic contactor element is switched on to a higher speed, the coil 7 'is moved by the movable carrier 18, which moves with the contacts to position b, the current flows from the feeders back to the contacts U1, V1 and W1, where a hub 26 is closed via the moving contacts 19 below the feeders. and the engine runs at higher rpm, which can also be operated permanently. When the contactor is switched off, the coil loses control voltage, the springs 19 equalize the force, pushing the moving parts to the neutral position, thus excluding the electromagnetic contactor element.

It is apparent from the description that the electromagnetic contactor element according to the invention greatly simplifies the known assemblies or connections, which require the use of two or more contactors for the operation of one motor. With a minor change in the contact part, it is possible to produce an electromagnetic contactor element for changing the direction of the electric motor (two contactors are now in use) and an electromagnetic contactor element for controlling the two-speed motor, which has two separate windings 6/4 or 8/6 poles mounted. for which two classic contactors are also currently in use.

Claims (4)

An electromagnetic contactor element, characterized in that it consists of a spatially and functionally separated and adjacent drive part (A), a contact part (B) and a part (C) in which the electronic circuit can be transmitted through all three parts have a common cover portion (2) with fastening means (3) which, after covering the cover portion (2), snap into the grooves (4) of the housing (1). Electromagnetic contactor element according to claim 1, characterized in that the longitudinally movable steel carrier (9) of the drive part (A) with the transfer lever (10) mounted on the axis (31) is connected to a longitudinally movable carrier (18) of contacts lying in the grooves (20), the springs (19) being inserted so as to hold in a neutral position the moving contacts (17) in the contact part (B) and the common core (8) in the drive part (A). Electromagnetic contactor element according to claims 1 and 2, characterized in that coils (7,7 ') with a common coil are installed in the drive part (A) -10 flexible cores (8), while the fixed core (6) is housed in the housing (1) and the fixed core (6 ') is in the lid (2), with the longitudinally movable steel support (9) connected to the moving core (9). 8). Electromagnetic contactor element according to claims 1 to 3, characterized in that the movable contacts (17) are mounted on the longitudinally movable carrier (17) and the fixed contacts (16) are in the excited state on the housing (1). coils (7.7 ') movable contacts (17) and fixed contacts (16) in such a position that they represent one of the possible positions of the contactor element.