JP2014107184A - Operation mechanism of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance reliability of an operation mechanism, by suppressing an impulsive force being applied to an operation counter for measuring the number of operations of a circuit breaker.SOLUTION: An operation mechanism of a circuit breaker includes a rotatable discharge/storage indication cam 1 for indicating energy discharge/storage state of an open-circuit spring, a microswitch drive lever 3 having one end rotating along the outer periphery of the discharge/storage indication cam 1, a coupling link 6 coupled to the other end of the microswitch drive lever 3, and an operation counter 7 for measuring the opening and closing times of a circuit breaker coupled with the coupling link 6. The operation counter 7 is operated by rotation of the discharge/storage indication cam 1, thus suppressing an impulsive force propagating to the operation counter 7.

Description

  Embodiments of the present invention relate to a circuit breaker operating mechanism that can improve the reliability of an operation counter that measures the number of times of opening and closing.

  Conventionally, a circuit breaker such as a vacuum circuit breaker has been provided with an operation counter for measuring the number of times of opening and closing. This is because a large impact force is applied to each part of the operation mechanism during the opening / closing operation, so that the number of times of opening / closing is grasped and a failure due to fatigue deterioration or the like is prevented in advance. For the opening / closing operation, a closing spring or an opening spring having a large operating force is used to improve the opening / closing speed (for example, see Patent Document 1).

  The operation counter is generally operated by a link mechanism connected to a trip catch. This is because the trip catch is connected to the open spring by a simple link mechanism, and the number of operations of the open spring can be directly measured by the operation counter. In addition, if the operation counter is operated indirectly through a complicated link mechanism, the reliability of measurement decreases. For this reason, a large impact force is also applied to the operation counter, causing fatigue deterioration and the failure rate is increased. If the operation counter malfunctions, the overall reliability of the operation mechanism is reduced.

Japanese Patent Laid-Open No. 2005-63863

  The problem to be solved by the present invention is to provide a circuit breaker operating mechanism that reduces the impact force applied to the operation counter that measures the number of times the circuit breaker is opened and closed, thereby improving the reliability of the entire operation mechanism.

  In order to solve the above-mentioned problem, the operation mechanism of the circuit breaker according to the embodiment includes a rotatable storage display cam that displays the storage and release states of the open spring, and one end on the outer periphery of the storage display cam. A microswitch drive lever that rotates along, a connection link that is connected to the other end of the microswitch drive lever, and an operation counter that measures the number of times the circuit breaker is connected to the connection link. It is characterized by.

BRIEF DESCRIPTION OF THE DRAWINGS The principal part explanatory drawing which shows the structure of the operation mechanism of the circuit breaker which concerns on Example 1 of this invention. The principal part explanatory drawing which shows the structure of the operation mechanism of the circuit breaker which concerns on Example 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the operation mechanism of the circuit breaker according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a main part explanatory view showing a configuration of an operation mechanism of a circuit breaker according to Embodiment 1 of the present invention. In addition, in the pin of each part, white indicates a movable pin and hatched indicates a fixed pin.

  As shown in FIG. 1, the storage / display cam 1 that displays the release / accumulation state of the open spring is fixed to a fixing member of the operating mechanism so as to be rotatable counterclockwise by a fixing pin 2. The storage display cam 1 is provided with a stepped portion 1a on a circular outer periphery. In the upward direction of the storage display cam 1, a Z-shaped microswitch drive lever 3 is fixed so as to be rotatable about a fixing pin 4 as a fulcrum. One end of the microswitch drive lever 3 is in contact with the outer periphery of the storage / display cam 1, and the microswitch 5 is turned off when the top of the step portion 1a is reached. The micro switch 5 turns on and off the motor that stores the open spring.

  An operation counter 7 is connected to the other end of the microswitch drive lever 3 via a plate-like connection link 6. The connecting portion is provided with an adjusting portion 3a for adjusting the operating distance. Further, a return spring 8 is provided that is urged so as to press one end of the microswitch drive lever 3 against the storage display cam 1 side.

  A plate-shaped main lever 10 having one end fixed to a pivotable main shaft 9 is provided in the downward direction of the storage display cam 1 in the figure. A link 11 is connected to the other end of the main lever 10 and comes into contact with one end of a trip catch 13 that rotates with the fixing pin 12 as a fulcrum. At the other end of the trip catch 13, a rotatable trip pin 14 is locked. The trip pin 14 is in contact with a triangular trip lever 16 that rotates about the fixed pin 15 as a fulcrum. The trip lever 16 is operated by an electromagnetic switch that is operated by a cutoff command or by manual operation.

  The main shaft 9 is connected to the movable shaft of the vacuum valve 17 and is opened and closed. Conventionally, an operation counter is directly connected to the trip lever 10 and the link 11.

  Thereby, when the trip lever 16 is operated, the trip catch 13 is rotated, and the main lever 10 is rotated by the spring force of the opening spring, so that the vacuum valve 17 can be opened at a high speed of 1 m / sec or more. Immediately after the opening operation, the motor operates to store the opening spring. When the storage display cam 1 rotates in accordance with the stored energy and the top of the stepped portion 1a reaches one end of the microswitch drive lever 3, the microswitch 5 operates and the motor is turned off. At the same time, the operation counter 7 operates. Thereafter, as shown in the figure, one end of the microswitch drive lever 3 is disengaged from the apex of the stepped portion 1a, is positioned at the bottom, and waits for the next opening command.

  Since the storage display cam 1 rotates at a low speed by such an operation, an excessive impact force is not applied to the operation counter 7 and fatigue deterioration of each member such as the connecting link 6 can be prevented. That is, since the operation counter 7 is operated in conjunction with the rotation of the storage display cam 1 that displays the stored state of the open spring, the operation counter 7 is not directly affected by the spring force of the open spring. Reliability can be improved. In addition, if the microswitch drive lever 3 and the connecting link 6 are formed in a plate shape and a plurality of holes are provided in the intermediate portion, the weight can be reduced.

  According to the circuit breaker operating mechanism of the first embodiment, since the operation counter 7 is connected to one end of the microswitch drive lever 3 that is rotated by the rotation of the storage display cam 1, the open spring is released. Therefore, it is possible to improve the measurement reliability of the operation counter 7 without applying excessive impact force directly to the operation counter 7.

  Next, the operation mechanism of the circuit breaker according to the second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a main part explanatory view showing the configuration of the operating mechanism of the circuit breaker according to the second embodiment of the present invention. The difference between the second embodiment and the first embodiment is the configuration of the connecting link. In FIG. 2, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 2, the microswitch drive lever 3 and the operation counter 7 are connected by a connection link 6 via an elastic member 18 such as rubber or a spring.

  According to the circuit breaker operating mechanism of the second embodiment, the impact force applied to the operation counter 7 can be remarkably suppressed.

  According to the embodiment as described above, the impact force propagated by the release of the open spring can be suppressed in the operation counter that measures the number of times the circuit breaker is opened and closed, and the failure rate can be reduced. Further, fatigue deterioration can be reliably grasped, and the reliability of the entire operation mechanism can be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Storage display cam 3 Micro switch drive lever 5 Micro switch 6 Connection link 7 Operation counter 9 Main shaft 10 Main lever 13 Trip catch 15 Trip pin 17 Vacuum valve 18 Elastic member

Claims (2)

A free-load storage display cam that displays the open-circuit spring storage and release state,
A microswitch drive lever whose one end rotates along the outer periphery of the storage display cam;
A connection link connected to the other end of the microswitch drive lever;
An operation counter for measuring the number of times the circuit breaker connected to the connection link is opened and closed;
A circuit breaker operating mechanism characterized by comprising:   The circuit breaker operating mechanism according to claim 1, wherein an elastic member is provided on the connection link.

Images