RU2496173C1 - Independent drive of circuit breaker - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention refers to snap-action devices, in which energy is accumulated upon compression of spiral spring, one end of which is rigidly attached to fixed part of circuit breaker and the other end interacts with moving rigid element by means of lantern wheel mechanism, and it may be used in independent drives of circuit breakers with translational displacement of moving contacts. Independent drive of circuit breaker containing lever installed with possibility of rotation relative to fixed axis, handle fixed with possibility of turning on one axis with lever, spring which one end is pivotally connected to lever, and the other - to fixed part of circuit breaker, lantern wheel mechanism for translational displacement of circuit breaker slider including a slot and a pin in it. According to the invention the pin is fixed on slider and the slot is made in lever.

EFFECT: increasing length of slider travel and reducing losses for friction under other stable parameters of drive.

2 dwg

Description

The invention relates to electrical switches, and in particular to instantaneous devices, in which energy is accumulated by compression of a coil spring, one end of which is rigidly attached to the fixed part of the switch, and the other interacts with a movable rigid element using a pin mechanism, and can be used in independent circuit breaker drives with translational movement of movable contacts.

A known drive for moving the contacts of a multi-pole circuit-breaker (see RF patent for the invention No. 2049364, IPC H01H 31/00). The drive of the circuit breaker consists of a handle mounted on a rotary axis, a crank mechanism connecting the handle to the movable contacts of the circuit breaker, a spring, one end of which is fixed to the circuit breaker housing and the other on a crank mechanism, and a stop fixed to the handle for fixing drive positions.

However, the known drive has a low switching speed due to the presence of a crank mechanism, characterized by an unambiguous dependence of the position of the contacts of the switch on the position of the handle.

An independent drive is known for moving contacts of a multi-pole cut-out switch (see RF patent for invention No. 2118862, IPC H01H 31/00). The drive for moving the movable contacts comprises a handle, a crank mechanism connecting the handle to a slider on which the movable contacts of the circuit breaker are fixed, as well as a pin mechanism for accelerated disconnection, fixation and self-resetting of the movable contacts. The latching mechanism comprises a lever mounted for swinging relative to the fixed axis, a spring, one end of which is pivotally connected to the lever, and the other to the fixed part of the switch. The slider is equipped with a protrusion (pin), and a groove is made in the lever to accommodate the pin in it.

The known drive has a high switching speed due to the use of a pin mechanism, however, the drive structure is cumbersome, since, along with the pin mechanism, it additionally contains a crank mechanism.

Closest to the claimed device is an independent circuit breaker drive equipped with a pin mechanism for translational movement of the slide with movable contacts fixed on it (VNK circuit breaker-disconnector for currents 250 A and 400 A, TU 3424-014-05755766-2004, manufacturer: Korenevsky OJSC low-voltage equipment factory ”). The drive contains a lever mounted for swinging relative to the fixed axis, a handle fixed rotatably on the same axis as the lever, a spring, one end of which is pivotally connected to the lever, and the other end - with the fixed part of the switch. The yoke mechanism includes a groove and a yaw located in it, with the yaw fixed to the lever and the groove made in a slider.

The disadvantage of the prototype is the small amount of stroke of the slider.

The objective of the invention is to develop an independent drive that allows you to reduce the size of the switch and reduce the amount of force on the handle with a constant stroke length of the slide.

The technical result consists in increasing the stroke length of the slider and reducing friction losses with other unchanged drive parameters.

The specified technical result is achieved in that an independent actuator of the switch, comprising a lever mounted rotatably relative to the fixed axis, a handle fixed to rotate on the same axis with the lever, a spring, one end of which is pivotally connected to the lever, and the other end to the fixed part circuit breaker, latch mechanism for translational movement of the slide of the circuit breaker, including the groove and the lug located in it, according to the decision of the lug is fixed on the slider, and the groove is made in the lever.

The invention is illustrated by drawings, where in Fig.1 shows a General view of the switch with the claimed drive, in Fig.2 - the drive adopted for the prototype. The positions in the drawings indicate:

1 - movable contact;

2 - fixed contact;

3 - case;

4 - slider;

5 - lever;

6 - handle;

7 - tarsus;

8 - spring;

a is the stroke value of the slider;

a 1 - the stroke value of the slider of the prototype;

in - the amount of slip mating parts;

B1 is the amount of slip of the mating parts of the prototype;

C is the angle of rotation of the lever;

R is the radius of the lever.

An independent drive is intended for use in a circuit breaker equipped with movable contacts 1, engaged with fixed contacts 2, mounted on the switch housing 3, during translational movement of the slider 4, on which the movable contacts are fixed. The independent drive includes a lever 5, mounted rotatably on an axis that is stationary relative to the switch housing. On one axis with the lever is a handle 6, designed to bring the rotation of the lever. The handle is fixed in such a way as to be able to independently rotate relative to the lever by an angle of 20-30 °, and is fixed in one of the extreme positions, for example, by means of a spring mechanism. For translational movement of the slide of the switch, a yoke mechanism is used, including a yoke 7 mounted on the slider and a groove in the lever to accommodate the yoke, and the groove is made in the form of an arc of a circle with a length of 20-30 °. The independent switch actuator comprises a spring 8, one end of which is pivotally connected to the lever and the other end to the part of the switch that is stationary relative to the housing, and the point of connection of the spring with the lever is offset relative to the straight line passing through the axis of the lever and the point of attachment of the spring to the fixed part.

An independent drive operates as follows. The handle is turned at an angle independent of the rotation lever, then they continue to move, turning the lever into rotation. The lever with the groove rotates, compressing the spring, at this time the forearm remains stationary. At the moment when the groove wall touches the pin, the point of connection of the spring with the lever intersects the straight line passing through the axis of the lever and the point of attachment of the spring with the fixed part. A further rotation of the lever occurs under the influence of a compressed spring, regardless of the movement of the handle, while the lever moves the slider with the help of a pin, connecting / disconnecting the movable contacts to the stationary ones.

Due to the fact that in the flow mechanism of the inventive independent drive of the circuit breaker, the spool is driven, and not leading, as in the prototype device, it was possible to achieve a result that is not obvious to a person skilled in the art. Namely, with the same radius R and the lever arm rotation angle jointly with a bobbin claimed device provides a large amount of the slide stroke and a smaller size bobbin slip on the groove wall in a work process. This means that with the same stroke of the slider, the claimed device with respect to the prototype will have a smaller radius of the lever, and therefore, will require less effort on the handle, and the design of the device will be more compact. Moreover, due to the smaller value in the inventive device has less friction loss, therefore, is subject to less wear and is characterized by higher reliability and durability.

Claims (1)

An independent switch actuator, comprising a lever mounted rotatably relative to the fixed axis, a handle fixed to rotate on the same axis as the lever, a spring, one end of which is pivotally connected to the lever, and the other end with the fixed part of the switch, a pinion mechanism for translational movement a slide of the switch, including a groove and a spline located therein, characterized in that the sprocket is fixed to the slider, and the groove is made in the lever.

Images