RU186468U1 - SPRING ACTUATOR FOR HIGH VOLTAGE CIRCUIT BREAKER - Google Patents

Abstract

The utility model relates to the field of electrical engineering, namely a spring drive, designed to control a high voltage switch. A spring drive for a high-voltage circuit breaker comprises a spring winding mechanism, including a shaft mounted on bearings located in the cheeks of the housing, an engine connected through a gearbox and chain transmission to the shaft, a spring factory cam, and an automatic engine stop device. The fist of the spring plant is rigidly fixed on the shaft between the cheeks of the housing and is installed with the possibility of interaction with the roller of the rotary driving lever associated with the switching springs. The device for automatically stopping the engine comprises a profile cam located on the outside of one cheek of the housing and a contact block that is electrically connected to the engine and is equipped with a spring-loaded plunger installed to interact with the profile cam. The working surface of the cam profile contains a section that ensures the engine to coast after it is turned off. The shaft of the spring plant mechanism comprises a section protruding from the outside of the housing cheek, on which a profile cam is rigidly fixed, mounted on the shaft with respect to the spring plant cam in such a way that when the cam working profile is located in the area of interaction with the spring-loaded plunger, the spring plant cam is located outside the driving rotation zone lever. A spring-loaded pusher with a contact block is mounted on the cheek of the housing so that the longitudinal axis of the spring-loaded pusher passes through the axis of rotation of the profile cam, the working surface of which is symmetrical about its longitudinal axis. The shaft portion of the spring factory mechanism protruding from the outside of the housing cheek is threaded and has a groove on which the profile cam is rigidly fixed with nuts and a lock washer with antennae. To simplify the manufacture of the working profile of the cam, the portion of the working surface of the cam profile that ensures the engine to coast after it is turned off is made along a circular arc with a maximum radius of the cam. The technical result consists in increasing the reliability of the spring drive by simplifying the design of the mechanism of the spring plant. 2 s.p. f-ly, 4 ill.

Description

The utility model relates to the field of electrical engineering, namely to a spring drive designed to control a high voltage switch.

A spring-loaded drive device for an electric switch is known (patent for invention SN 385328, class 21 s, 40/50, published March 15, 1965), the mechanism of the spring plant of which contains an engine, a crank shaft connected via a chain transmission to the engine, a gear installed on the crank shaft and connected to the gear mounted on another shaft, on which the fist of the spring plant is rigidly fixed, as well as the locking (locking) spring-loaded four-arm lever rigidly mounted on the axis. One shoulder of the locking spring-loaded four-arm lever is installed with the possibility of acting on the contacts of the auxiliary switch electrically connected to the engine, and the other shoulder is pivotally connected to the locking element of the multi-link kinematic chain between the driving link, which is affected by the switching springs, and the output link, connected to the switch mechanism . The disadvantage of this drive is its lack of reliability due to the presence of a significant number of structural elements that interact with each other.

Closest to the claimed technical solution is a spring drive for a high-voltage circuit breaker (utility model patent No. 43682, published January 27, 2015, bulletin No. 3), comprising a spring factory mechanism including a shaft mounted with support on two ball bearings that are located in the cheeks housing, an engine connected through a gearbox and a chain transmission to the shaft of the mechanism of the spring plant, a fist of the spring plant, rigidly mounted on the shaft between the cheeks of the case. The fist of the spring plant is mounted on the shaft with the possibility of interaction with the roller of the rotary driving lever, which is connected to the working (including) springs, and contains a finger mounted on the end surface of the fist, providing a link between the fist and the spring-loaded lever of the automatic engine stop device after the fist of the spring plant leaves operating range of the driving lever. The device for automatic engine stop includes a roller installed in the support of the housing cheek, at one end of which extends from the outer side of the housing cheek, a spring-loaded profile cam is rigidly mounted, and a spring-loaded lever is installed at the other end of the roller extending from the inside of the housing cheek and contains a node locking contact of moment switching (hereinafter referred to as contact block) mounted on the cheek of the housing on the same side as the spring-loaded profile cam. The contact block is electrically connected to the engine and is equipped with a spring-loaded pusher installed with the possibility of interaction with the profile cam.

The profile cam is equipped with two return springs: a tension spring fixed at one end to the housing jaw, the other on the profile cam, and a torsion spring, which creates an additional moment to the tension spring, which ensures the return of the profile cam and the rotation of the roller after the profile cam is applied to the spring-loaded pusher and removed impact on the spring-loaded lever of the finger of the fist of the spring plant. The working surface of the cam profile, interacting with a spring-loaded plunger, is made along an arc of a circle, the center of which is offset from the center of rotation of the profile cam, and contains a section that ensures the engine to coast after it is turned off. In addition, the cam profile contains straight sections, one of which is designed to interact with the latch, which rests the profile cam from the action of its own springs in the actuator position "springs are not brought" in a vertical position.

The spring-loaded lever is configured to freely rotate on the roller by a certain angle, but due to the return spring acting on it and the pin rigidly mounted on the roller, it has a fixed upper position, in which the spring presses the edge of the lever to the pin. The free rotation of the lever within the specified limits is necessary to ensure the operation of slowly turning on the drive during slow operation with the contacts of the switch, when the shaft is rotated in the opposite direction for diagnostics and tuning of the drive-switch system.

When the shaft is rotated counterclockwise, the finger of the fist of the spring plant sets in motion a spring-loaded lever that rotates the roller together with a profile cam interacting with the spring-loaded pusher of the contact block, from which the contacts of the block are opened and the engine is turned off.

The disadvantage of such a spring drive is the presence of a large number of parts in the spring plant mechanism, including spring-loaded ones located both between the cheeks of the drive housing and outside one of the cheeks, which are involved in transmitting movement from the shaft through the fist of the spring plant to the spring-loaded pusher associated with contact block, turning off the engine at the right time for the drive. Despite the presence of two return springs in the profile cam, it can jam during operation. The location of the spring-loaded lever between the cheeks of the housing makes it difficult to control the quality of its assembly, which leads to a high probability of its deformation and jamming during operation, and also complicates the work of replacing the device during repair. When the spring-loaded lever is deformed, its connection with the finger of the spring plant is broken, the absence which eliminates the transmission of the signal to turn off the engine at the right time after the spring plant, and, as a result, leads to failures in the operation of the spring plant during operation and spring drive.

The technical problem to which the utility model is directed is to increase the reliability of the spring drive for high-voltage circuit breakers during its operation.

The technical result of the claimed utility model consists in simplifying the design of the spring drive by installing the profile cam of the automatic engine shut-off device on the portion of the shaft of the spring plant mechanism protruding from the outside of the housing cheek and making the cam working surface symmetrical with respect to its longitudinal axis, which eliminated the transmission of movement from the spring plant cam through intermediate elements to the profile cam interacting with the pusher to increase the reliability of the spring drive another person responsible for the operation of the high voltage switch.

The technical result is achieved due to the fact that in the spring drive for high-voltage circuit breakers containing the mechanism of the spring plant, including a shaft mounted on bearing bearings located in the cheeks of the housing, an engine connected through a gearbox and a chain drive to the shaft, a spring factory fist rigidly fixed to the shaft between the cheeks of the housing and installed with the possibility of interaction with the roller of the rotary driving lever associated with the inclusion springs, a device for automatically stopping the engine, containing located on the outer side of one cheek of the casing, a profile cam and a contact block electrically connected to the engine and equipped with a spring-loaded follower installed to interact with the profile cam, the working surface of the cam profile comprising a section allowing the engine to coast after it is turned off, according to a utility model, a shaft The spring plant mechanism comprises a section protruding from the outside of the housing cheek, on which a profile cam is rigidly fixed, mounted in relation to the cam spring drive in such a way that when the cam operating profile is located in the area of interaction with the spring-loaded plunger, the spring plant fist is located outside the driving lever rotation zone, and the longitudinal axis of the spring-loaded plunger passes through the rotation axis of the profile cam, the working surface of which is symmetrical about its longitudinal axis.

In a particular case, the shaft section of the spring factory mechanism protruding from the outside of the housing cheek is threaded and has a groove on which the profile cam is rigidly fixed using nuts and a lock washer with antennae.

In a particular case, the portion of the working surface of the cam profile that ensures the engine to coast after it is turned off is made along a circular arc with a maximum cam radius.

The essence of the utility model is explained as follows.

The execution of the shaft of the spring plant mechanism with a section protruding from the outside of the housing cheek, on which the profile cam is rigidly fixed, and the installation of the profile cam in relation to the spring plant cam in such a way that when the working profile of the cam is in the area of interaction with the spring-loaded plunger, the spring plant cam is located outside the zone rotation of the drive lever, made it possible to transfer motion from the shaft through the profile cam to a spring-loaded pusher connected to the contact block, which sends a signal to the shutdown motor at the right time after plant springs, thereby to eliminate the impact of the fist spring plant on the cam profile via intermediate elements leading to jamming, resulting in simplification of the structure and improve the reliability of the drive spring in charge of the high-voltage switch.

The installation of a spring-loaded pusher with a block of contacts on the outside of the cheek of the housing so that its longitudinal axis passes through the axis of rotation of the profile cam mounted on the protruding portion of the shaft, the execution of the working surface of the profile cam symmetrical relative to its longitudinal axis allowed the device to automatically turn off the engine only from the elements installed outside the cheeks of the case, and minimize their number, which led to a simplification of the design and provided free access to all etalyam device automatically switching the engine off during repairs. In addition, the implementation of the working surface of the profile cam symmetrical with respect to its longitudinal axis ensured the interaction of the profile cam with a spring-loaded plunger during rotation of the shaft in any direction, which allowed the operation of the slow operation of the contacts of the switch.

The execution in the particular case of the portion of the shaft of the spring factory mechanism that protrudes from the outside of the body’s cheek and the rigid fastening of the profile cam with nuts and the lock washer with antennae made it possible to ensure the required relative position on the shaft of the profile cam and the cam of the spring plant relative to each other at no additional cost.

The implementation in a particular case of a section of the working surface of the cam profile, which ensures that the engine runs out after it is turned off, along a circular arc with a maximum cam radius, has made it easier to manufacture the cam working profile.

The essence of the utility model is illustrated by drawings, where:

figure 1 is a kinematic diagram of a spring drive for a high voltage circuit breaker with the engine turned on;

figure 2 is a kinematic diagram of a spring drive for a high voltage circuit breaker with the engine turned off;

figure 3 is a section aa in fig. 2 (gearbox and elements 12, 17, 18, 19 are shown conditionally);

figure 4 - remote element B in figure 2.

The spring drive for high-voltage circuit breakers contains a spring winding mechanism including a shaft 1 (Fig. 1, Fig. 2) mounted on bearing bearings 2 in the cheeks 3, 4 of the housing (Fig. 3), an engine 5 connected through a gearbox 6 and a chain gear 7 with a shaft 1, a fist 8 of a spring plant 9, rigidly mounted on a shaft 1 and installed between the cheeks 3 and 4 of the housing with the possibility of interaction with the roller 10 of the rotary driving lever 11 connected to the switching springs 9, an automatic engine shutdown device. The automatic engine shutdown device comprises a profile cam 12 and a contact block 13 electrically connected to the engine 5. The drive lever 11 is provided with a tooth 14 for fixing it to the roller 15 of the start-up trigger mechanism (not shown in the drawing). To ensure the damping of mechanical energy of the closing springs 9 after turning on the switch (not shown in the drawing), a buffer 16 is installed.

The shaft 1 contains a protruding portion outside the cheek 4 of the housing 17 (Fig. 3), made with a thread and a groove (not shown in the drawing), on which the profile cam 12 is rigidly fixed with nuts 18 and a lock (lock) washer 19 with antennae (Fig. . four). Rigid fastening of the profile cam 12 with the shaft 1 can be achieved in various ways, for example, using a pin, a slotted profile, a key, a screw, and other methods.

The contact block 13 is equipped with a spring-loaded pusher 20, the longitudinal axis of which passes through the axis of rotation of the profile cam 12 (cam mechanism with a central pusher). In this case, the profile cam 12 is rigidly mounted on the shaft 1 with respect to the cam 8 of the spring plant in such a way that when the working profile of the cam 12 is in the zone of interaction with the spring pusher 20, the cam 8 of the spring plant is located outside the range of the operating lever 11 (in Fig. 2 the range of the drive arm 11 is shown by a dash-dot line).

The working surface of the cam profile 12 is symmetrical about its longitudinal axis. In a particular case, the portion of the working surface of the cam 12 profile, which ensures that the engine 5 is coasted after it is turned off, is made along a circular arc with a maximum radius (Rmax) of the cam 12. The length of the portion of the working surface that provides the engine coast after it is turned off is determined by testing under various conditions and accepted with a reliable margin.

The spring drive for a high voltage switch operates as follows.

When the engine 5 is turned on, rotation through the gearbox 6 and the chain gear 7 is transmitted to the shaft 1, which rotates counterclockwise. In this case, the fist 8 of the spring plant 9 interacts with the roller 10 and rotates the drive lever 11, which is in the lower position, clockwise (Fig. 1). The drive lever 11 cockes the switching springs 9. At the end of the factory of the switching springs 9, the driving lever 11 is fixed with its tooth 14 to the roller 15 of the start-up trigger. The tooth 14 holds the driving lever 11 in the upper position after the fist 8 of the spring plant comes out of contact with the roller 10. The switching springs 9 are cocked, the drive is ready to turn on. The fist 8 of the spring plant continues to rotate together with the shaft 1 and leaves the operating range of the driving lever 11. After the fist 8 leaves the operating range of the driving lever 11, the profile cam 12, rotating with the shaft 1 counterclockwise, acts on the spring-loaded pusher 20 with its working profile The spring-loaded pusher 20, under the action of the cam 12, moves to the left and opens the contacts of the block 13, which turns off the engine 5. After the engine 5 is turned off, the shaft 1 continues to rotate in the counterclockwise direction , while the spring-loaded pusher 20 does not move, but remains in the left extreme position due to the impact of the working section, the profile of which is made along a circular arc with a maximum radius of the cam 12, until the engine 5 is completely stopped.

After turning off the engine 5, a command is issued to the switching solenoid. The start-up start mechanism rotates the lever with the roller 15, which frees the tooth 14, and the drive lever 11 with the roller 10 rotates under the action of the closing springs 9 counterclockwise until it stops against the buffer 16, and, having pressed its piston, it stops Figure 2 shows by dashed lines the position of the drive lever 11 after discharging the closing springs 9, when the power mechanism has worked (turned on the switch) and the drive lever 11 has stopped in the lower position.

In the process of slowly operating the contacts of the switch, the motor 5 is turned off, the shaft 1 is manually rotated clockwise, while the profile cam 12, rigidly mounted on the shaft 1, also moves clockwise and acts on the spring pusher 20, which, moving to the left, does not interfere the process of slow operation of the contacts of the switch. Thus, performing the cam operating profile symmetrical with respect to its longitudinal axis and installing a spring-loaded plunger with a contact block on the housing cheek so that the longitudinal axis of the spring-loaded plunger passes through the axis of rotation of the profile cam provides the impact of the profile cam on the spring-loaded plunger when the shaft rotates in both directions.

The implementation of the shaft of the spring plant mechanism with a section that protrudes outside the housing cheeks, the rigid fastening of the profile cam in this section in a certain position relative to the spring factory cam, and the execution of the working surface of the profile cam of a symmetrical shape made it possible to minimize the number of parts involved in automatic engine shutdown , which increased the reliability of the spring drive, on which the operation of the high-voltage switch depends, and ensured free access to all parts automatic engine shutdown during repair work.

In accordance with the claimed utility model, OOO Elmash (UETM) developed and manufactured a prototype spring drive for a high-voltage circuit breaker, which passed successful tests.

Claims (3)

1. Spring drive for a high-voltage circuit breaker, comprising a spring winding mechanism, including a shaft mounted on bearings located in the housing cheeks, a motor coupled through a gearbox and chain transmission to the shaft, a spring factory cam fixed to the shaft between the housing cheeks and installed with the possibility of interaction with the roller of the rotary driving lever associated with the switching springs, an automatic engine stop device comprising a filed cam and a contact block electrically connected to the engine and equipped with a spring-loaded follower mounted to interact with the profile cam, the working surface of the cam profile comprising a section allowing the engine to run out after being turned off, characterized in that the shaft of the spring plant mechanism comprises a protruding outside the cheek housing section on which the profile cam is rigidly fixed, mounted in relation to the fist of the spring plant so that when the working pr Ofil cam in the area of interaction with the spring-loaded plunger, the fist of the spring plant is located outside the rotation zone of the drive lever, and the longitudinal axis of the spring-loaded plunger passes through the axis of rotation of the profile cam, the working surface of which is symmetrical about its longitudinal axis. 2. The spring drive for the high-voltage switch according to claim 1, characterized in that the portion of the shaft of the spring factory mechanism protruding from the outside of the housing cheek is threaded and has a groove on which the profile cam is rigidly fixed with nuts and a lock washer with antennae. 3. The spring drive for the high-voltage circuit breaker according to claim 1, characterized in that the portion of the cam profile working surface that ensures the engine to coast after it is turned off is made in a circular arc with a maximum cam radius.

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