RU2076376C1 - Electromagnetic relay - Google Patents

Abstract

FIELD: electrical engineering; low-voltage switching devices with valve-type magnetic system. SUBSTANCE: relay has L-shaped yoke 1, core 2, control winding 3 wound on former 4, armature 5 carrying on one end movable contact 7, cylindrical reset spring 8, armature travel limiter 9, fixed contact 10, dent 6 in yoke 1 to receive other end of armature 5; mentioned cylindrical reset spring 8, dent 6 in yoke 1, and armature 5 form movable joint with one degree of freedom. EFFECT: improved reliability of relay. 10 dwg

Description

 The invention relates to the field of electrical engineering, namely to low-voltage switching devices with a magnetic valve-type system.

Known electromagnetic relays containing a L-shaped yoke, a core with a coil, an armature with a movable contact fixed to it, a fixed contact, a coil spring [1, 2]
The closest technical solution, selected as a prototype, is an electromagnetic relay [2] containing a L-shaped yoke, a core, one end of which is engraved in a yoke, a control winding worn on the core and located on the frame between two cheeks, an anchor at one end which has two grooves for connecting to the yoke, and on the other end a movable contact is fixed, a cylindrical return spring connecting the yoke to the armature, an arm limiter, rigidly attached at one end to the frame cheek over which an anchor is laid, a fixed contact, forming a contact group with the movable contact of the anchor.

 Known electromagnetic relay has the disadvantage consisting in the following.

An attempt to increase the switching current without increasing the size of the armature and yoke leads to a mandatory increase in the angle of inclination of the armature to the head of the core, since a large gap between the contacts is required for reliable interruption of the arc. In this design, the angle of inclination of the anchor to the head of the core can be increased only by expanding the groove in the anchor. However, when the width of the groove in the armature is greater than the thickness of the yoke (Fig. 1, 2), the contacts during switching can arbitrarily shift relative to each other (Fig. 3, 4). This circumstance in the operating conditions of the relay when exposed to external vibration and shock loads causes:
change in relay parameters over time due to spontaneous changes in the gap between the armature and the head of the core, especially when using spherical contacts;
an increase in breaking capacity at the contacts due to an arbitrary change in the contact area and, as a consequence, their burning;
a significant decrease in the reliability and resource of the relay.

 The claimed invention is aimed at improving reliability and improving the overall dimensions of the electromagnetic relay.

 The specified technical result is achieved by the fact that in an electromagnetic relay containing a L-shaped yoke, a core, one end of which is engraved in a yoke, a control winding worn on the core and located on the frame between two cheeks, an anchor with a movable anchor rigidly fixed to one of its ends contact, a cylindrical return spring connecting the yoke to the anchor, the arm travel limiter, rigidly attached at one end to the frame cheek, over which the anchor is located, a fixed contact, forming an anchor with the movable contact I contact group, in the yoke in the plane perpendicular to the longitudinal axis of the core, at least one recess is made into which the other end of the armature is inserted to the entire depth so that the said coil spring, the recess in the yoke and the armature form a movable joint with one degree of freedom .

 In FIG. 5 shows the design of an electromagnetic relay. The composition of the relay includes the following elements. L-shaped yoke 1, in which the core 2 is engraved at one end. The control winding 3 is located on the frame 4 between two cheeks. An anchor 5, one end of which (Fig. 6) is inserted all the way into the recess 6 (Fig. 7) in yoke 1. A movable contact 7 is rigidly attached to the other end of the anchor 5. A coil spring 8 connecting the yoke 1 to the armature 5. The travel limiter of the armature 9, rigidly attached at one end to the cheek of the frame 4, over which the armature 5 is located. Fixed contact 10, forming a contact group with the movable contact 7.

 The principle of operation of the claimed device is as follows.

 When voltage is applied to the control winding 3, the core 2 is magnetized, and the magnetic flux resulting from this closes along the yoke 1, the armature 5 and the air gap between the armature 5 and the head of the core 2. The magnetomotive force applied to the air gap develops traction in it (attractive force) exceeding the resistance of the return spring 8. The anchor 5, rotating relative to the contact line of its molded end and the recess 6, is attracted to the head of the core 2. The movable contact 7 closes with the fixed con tact 10, which provides switching external electrical circuit.

 When you remove the voltage from the control winding 3 due to the disappearance of magnetic flux in the circuit core 2 yoke 1 armature 5, the attractive force of the armature 5 to the head of the core 2 decreases sharply. Under the influence of the force of the return spring 8, the anchor 5 returns to its original state. Contacts 7, 10 open and the external electrical circuit is de-energized.

 In order for the anchor 5 to not move in the plane perpendicular to the longitudinal axis of the core 2 during operation, the recess 6 is made with a length shorter than the width of the yoke 1, and with the edges equally spaced from the edges of the yoke 1.

 In FIG. 8 shows an electromagnetic relay, the principle of which is similar to the above. Structurally, this relay differs from that shown in FIG. 5 in that the anchor 5 is made in the form of two plates rigidly interconnected between themselves of different thicknesses and lengths. In this case, one end of a thinner and longer plate (Fig. 9) is inserted into two recesses 6 (Fig. 10) of yoke 1, and a movable contact 7 is rigidly attached to its other end. The limiter of the armature 9 is made in the form of an additional fixed contact.

Thus, the implementation of the deepening in the yoke in a plane perpendicular to the longitudinal axis of the core, and the introduction of the end of the armature favorably distinguishes the claimed device from the known, as it allows:
provide a movable connection of the armature with one degree of freedom for any desired angle of rotation of the armature;
to exclude the possibility of spontaneous displacement of the relay contacts relative to each other during operation and to prevent the possibility of their burning;
to increase reliability and reduce the dimensions of the device when it is used for switching high currents.

 Laboratory and operational tests conducted at JSC "KZAE" showed high reliability of the electromagnetic relay, made according to the proposed design.

Claims (1)

 An electromagnetic relay containing a L-shaped yoke, a core, one end of which is engraved in a yoke, a control winding worn on the core and located on the frame between two cheeks, an armature with a movable contact fixed to one of its ends, a cylindrical return spring connecting the yoke to anchor, anchor travel stop, rigidly attached at one end to the cheek of the frame, over which the anchor is located, a fixed contact, forming a contact group with the movable contact of the anchor, characterized in that in the yoke in the plane, perpendicular to the longitudinal axis of the core, at least one recess is made into which the other end of the armature is inserted to the entire depth so that the coil spring, the recess in the yoke and the armature form a movable joint with one degree of freedom.

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