SU1543472A1 - Automatic current-limiting switch - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to reduce power consumption, increase service life and simplify the design. The intermediate link connecting the bore 3 of the electromagnet with the movable contact 18 is made in the form of a system of levers and rods 11. The lever 4 has a common axis of rotation with the core 3 and is connected to it by means of a locking mechanism in the form of a latch 13 and a hook 5. At the top Parts of the lever 4 are equipped with a swinging lever 9, one end of which is spring-loaded, and the other is connected through a pulley 11 with a moving contact 18. A pulley actuator 16 is fixed to the pulley 11. When the bark 16 moves to the disconnected position, it leads the moving contact 18 behind itself and at the same time turns the lever 9, which by its projection disengages the locking mechanism. As a result, the switch is turned off. 4 il.

Description

The invention relates to electrical engineering, namely, to electric power devices designed to protect DC installations against overloads and short-circuit currents.

The purpose of the invention is to reduce power consumption, increase service life and simplify the design.

Figure 1 shows the proposed switch in the off position; figure 2 - the same, in the on position; fig.Z - the same, in the position of free tripping; Fig, 4 is an exemplary view of the characteristics of the forces

resistance and traction characteristics of the proposed and known switches.

The automatic current-limiting switch contains an electromagnetic drive that serves to turn the switch on and hold it in the on position, which includes the magnetic circuit 1, coil 2, measles 3, and double lever 4 with a hook 5 and an emphasis 6. Anchor 3 and lever 4 are mounted on a common axis 7 On axis 8 a swinging lever 9 is installed with a protrusion A. The upper end of the swinging lever 9 is connected through axis 10 to the thrust 11, and a spring rests against its lower end

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at 12. Anchor 3 is connected with lever 4 by latch 13, rotating at one end on axis 14 of core 3 and engaging the other horse-drawn with lever 4 by means of a hook 5 made in the vice axis. In the open position, the rotation of the swinging lever 9 under the action of the spring 12 is limited by the stop 6.

On the magnetic core 1, a switching-off impulse drive 15 is installed, the measles 16 of which is rigidly connected to the pull I1. The contact block has a fixed contact 17 and a movable contact 18, which is connected through

C 19 with r And I drive. On the case mounted stop 20.

The switch is turned on as follows.

When voltage is applied to the coil 1, the bore 3 is attracted to the magnetic conductor 1. Simultaneously with the bark, through the latch 13, the lever 4 with the swing lever 9 installed on it moves the movement of the upper end of the lever 9 to the pull 11 and the movable contact 18, while the lower end of this lever compresses the spring 1 2 iB the moment of closing the contacts the upper end of the lever 9 stops and with further movement of the core 3 begins to rotate around the axis 10, wipe clockwise, while the lower end of the lever 9 moves away from the stop 6 p causing contact failure. The switch is on. Spring 12 provides contact pressure.

The shutdown process occurs dne in a duct manner.

When the switching-off impulse drive 15 triggers, the 16, rigidly connected to the pull 11, are moved away by the moving contact 18, the movement of the contact 18 is transmitted to the lever 9, while the lever 9 rotates around the axis 8 counterclockwise. The lower end of the lever 9 compresses the spring 12, and the upper end of the protrusion A rotates the latch 13 on the axis 14 and disengages it from the engagement with the lever 4. The lever 9 under the action of the spring 12, which in the case of disconnecting, turns clockwise, the lower end It reaches the stop 6 of the lever 4, and then both levers move to the left, retraction of the moving contact 17 to the extreme position. Turn off

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thirty

five

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The reader is disconnected and is in the free release position. Next, the blocking contacts are triggered, which break the chain of the holding coil 2, the measles 3 disappears and the latch 13 engages with the lever 4. The switch is ready for re-activation.

The proposed switch design makes it possible to reduce the drive power consumption when switched on 8 times and to increase the resource for mechanical wear resistance by 2.5 times. This result is achieved by using a switch design that allows free release by the action of the main functional element of the switch - a moving contact on the locking mechanism, which is one of the elements of the sequential kinematic chain. As a consequence, it is possible to qualitatively change the characteristic of the resistance forces to turn on in the area of motion of the electromagnet core and, accordingly, its traction characteristic (figure 4 presents: a - the qualitative view of the characteristic characteristics of the resistance forces of the prototype, b - the traction characteristic of the electromagnet well known cactillator; c - qualitative characterization of the type of resistance of the proposed switch; g - the reciprocating characteristic of the electromagnet of the proposed switch; the switching power is reduced due to the absence of an auxiliary electromagnet of the free tripping mechanism and, at the same time, a simplified design is achieved. Simplification of the design is also achieved by combining the functions of the shut-off and the contacting springs in one spring due to the use of the said pivot arm. The increase in the mechanical durability of the resource has become possible due to the fact that in the proposed design of the switch there is no need for a high-speed electromagnet that does not directly participate in the shutdown process. As a result, it becomes possible to reduce the switch on speed by increasing the number of turns of the electromagnet coil and, accordingly, to reduce the shock loads on the switch nodes.

Claims (1)

Invention Formula An automatic DC limiting switch that contains an electromagnetic and a pulsed drive, a moving contact, a cable with a swivel lever pivotally mounted on the cable, a latch and a spring, while turning the swivel lever to an electromagnetic actuator with a moving contact, characterized in that , in order to reduce power consumption, increase the service life and simplify the design, it is equipped with an additional pivot arm, abutment and hook the stop and hook are mounted on an additional pivot arm, an additional pivot arm is mounted on the core of the electromagnetic actuator so that it can be rotated relative to it, the latch is hingedly mounted on the cortex of the electromagnetic actuator with the possibility of interaction 0 with a hook, the main pivot arm is pivotally connected with an additional pivot arm with the ability to interact with the latch, the support is mounted with the possibility of interaction with the main pivot arm, a spring is installed between the magnetic conductor of the electromagnetic drive and the main pivot arm, and the bark of the impulse drive is connected with thrust. figure 1 & / & Z IS P fih Jazy jyttopt fiea mm