JPH04296417A - Manual operation mechanism of circuit breaker - Google Patents

Abstract

PURPOSE:To prevent the lost motion of a closing operation mechanism due to the wrong operation of a push button, attached to a circuit breaker in which the closing operation being performed by the de-energizing motion of an energized operational spring, for a manual operation. CONSTITUTION:An interlock plate 4 is coupled to a link a which interlocks a close-open display 8, whose front face swings upward and downward by means of close/open motion of a circuit breaker, the lower end of the interlock plate 4 is interposed between th rear face of a push button 5, for manual operation, and a mounting plate 13 when the circuit breaker being in a close state.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual operating mechanism for circuit breakers.

0003

2. Description of the Related Art For example, among operating mechanisms for power circuit breakers, there is an electric spring operating mechanism that closes a main contact using the return force of an operating spring pulled by a small-capacity electric motor. In this electric spring operation mechanism, a strong return spring is used to operate the movable main contact of the circuit breaker at high speed, which interrupts fault current in the power system and performs reclosing operation. When the spring is released, a large force and shock are applied to the shaft and links that work together with the spring. Moreover, the operating spring of this operating mechanism is always energized and on standby, regardless of whether the main contact is on or off, in order to perform the high-speed re-closing operation that is responsible for the operation of the circuit breaker, and is ready for operation at any time. It has become.

[0004] In such a circuit breaker operation mechanism, a push button for manual operation is attached to the front plate of the circuit breaker, so that when the main contact of the circuit breaker is open, it can be manually closed. A manual operating mechanism is provided. FIG. 5 shows a circuit breaker 20 provided with such a manual operating mechanism. In the figure, at the rear of the circuit breaker 20, disconnecting sections 24A and 24B are vertically protruded, a front plate 25 is erected at the front, and wheels 25b are provided at the lower end in the front, rear, left, and right directions.

Among these, handles 25a are attached to the center of the front plate 25 on the left and right sides when viewed from the left side (that is, the front side) of the figure, and the circuit breaker 20 is attached to the lower right side of the front plate 25.
An operating mechanism section 26 is provided. This operating mechanism section 2
A mechanism frame 21 indicated by a dotted line in the figure is attached to the front side of the inside of the mechanism frame 6, and a manual operation mechanism 22, which will be described later, is attached to the upper front end of this mechanism frame 21.

FIG. 6 shows an enlarged detailed view of this manual operating mechanism 22, with the circuit breaker in the open position. In the figure, a stepped pin 7 is rotatably inserted into the tip of a support (not shown) fixed to the mechanism frame 21, and the middle part of the on/off indicator 23 is fixed to the stepped pin 7. At the front end of the on/off indicator 23, a square hole (not shown) is formed in the mechanism frame 21 and front plate 25. This on/off indicator 23
On the front of the
A nameplate (not shown) is affixed.

Below the on/off indicator 23, a rotating shaft 20 of a circuit breaker closing toggle (not shown) is provided in a direction perpendicular to the plane of the figure. The upper end is fixed with a bolt 20a. on the other hand,
A mounting plate 13 is provided on the mechanism frame 21 in a direction perpendicular to the plane of the drawing, and an inverted L-shaped stopper 12 is fixed to the front of the lever 6 on the back of the mounting plate 13. The upper rear end 12b of the stopper 12 is brought into contact with the restoring force of a spiral spring (not shown) wound around the stopper 20.

Furthermore, a shaft 5a of the push button 5 is loosely attached to the mounting plate 13, and a spacer tube 12a is inserted into the shaft 5a at the back of the stopper 12, and a stopper is inserted into the rear end of the spacer tube 12a. The ring 12c is inserted, and a compression coil spring 14 is inserted in advance between the back surface of the head 5b of the push button 5 and the front surface of the mounting plate 13. Now, in the manual operation mechanism 22 configured in this way, by pushing the head 5b of the push button 5 from the front, the lower end of the lever 6 is pushed,
The rotating shaft 20 is rotated to the left, a catch (not shown) is removed, and a biased operation spring (not shown) is released to close the circuit breaker. At the same time, the rear end upper part 23a of the on/off indicator 23 is pushed downward by a lever (not shown) and swings to the right as shown by arrow A, and the front end lower part 23b of the on/off indicator 23 moves upward and moves to the stepped position. This is a substantially vertical surface located in front of the pin 7.

[0009]

[Problems to be Solved by the Invention] However, in the manual operation mechanism of the circuit breaker configured as described above, even when the main contact of the circuit breaker is closed, if the push button 5 is pressed by mistake, the energization release the operated spring. Then, the impact caused by this release becomes large because the main contact and the link mechanism that closes the main contact are not connected to the load of the operating spring, and the return is in a no-load state, so-called dry striking. If they overlap, the life of the connecting parts may be shortened due to the impact.

Therefore, in the past, the front plate 25 was designed to prevent the input pushbutton 5 from being pressed when the main contact was in the "on" state.
A caution label is pasted on the front side of the push button 5, and is also described and explained in the instruction manual. Although this method can prevent erroneous operation to some extent, the caution label and instruction manual It is not possible to completely prevent erroneous operations such as pressing the push button 5 without reading the manual. Another possibility is to strengthen the parts that receive the impact when the operating spring returns, but this would make the parts larger and heavier, which would increase their inertia and reduce the feeding speed when normally operated. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a manual circuit breaker operating mechanism that can prevent drying caused by erroneous operation of the circuit breaker manual operating mechanism and prevent shortening of the life of mechanical components. [Structure of the invention]

[0011]

[Means and operations for solving the problems] The present invention provides an on/off indicator whose front surface swings up and down when the circuit breaker is on/off;
In a manual operating mechanism for a circuit breaker, which is equipped with a push button that releases an energized operating spring to operate the closing operation mechanism of the circuit breaker, one side is connected to an on/off indicator via a link, and one side is connected to an on/off indicator via a link. By providing an interlock plate, the other end of which engages with the push button when the front of the indicator moves upward, and the other end disengages when the front of the on/off indicator moves downward, the circuit breaker is in the closed state. This is a manual circuit breaker operating mechanism that disables the operation of the push button to prevent the circuit breaker operating mechanism from going dry due to erroneous operation of the push button, thereby preventing a reduction in the lifespan of the operating mechanism's parts.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the manual operation mechanism for a circuit breaker according to the present invention will be described below with reference to the drawings. However, parts that overlap with those in FIGS. 5 and 6 are given the same reference numerals and their explanations will be omitted. Figure 1 shows
2 is a right side view showing the manual operation mechanism of the circuit breaker of the present invention when the main contact of the circuit breaker is open, FIG. 2 is a view when the main contact is closed, and FIG. 3 is an enlarged left side view of FIG. 4. shows.

In FIG. 1, a mounting plate 1 is vertically fixed to the mechanism frame 21 in front of the stepped pin 7 through a mounting hole 1a provided at the upper end of the mounting plate 1. . A stepped pin 1 is located slightly forward of the center of this mounting plate 1.
5 is fixed with a nut 15a as shown in FIG. The stepped pin 15 is rotatably provided with the middle part of the triangular link 2 on the right side when viewed from the front, and the rear end of the triangular link 2 is connected to the upper end of the oval link 9 via the pin 17. The lower end of this link 9 is connected via a stepped pin 16 to the lower center of the on/off indicator 8, slightly toward the front.

On the other hand, a pin 18 is attached to the front end of the triangular link 2.
The upper ends of the elliptical links 3 are connected to each other through the link 3, and an elliptical hole 3a having a parallel portion in the longitudinal direction of the link 3 is formed at the lower end of the link 3, as shown in FIG. A pin 19 is loosely inserted into this oval hole 3a, and an E-shaped retaining ring (details omitted) is inserted into this pin 19 so as to sandwich the link 3 through which this pin 19 passes. Both ends of a spiral spring 10 having substantially V-shaped ends are wound around the
As a result, the pin 19 is constantly pressed downward by the spring 10.

Further, as shown in FIG. 3, a vertically long rectangular groove 1b is formed on the right side of the lower part of the mounting plate 1. An oblong hole (not shown) that is elongated in the vertical direction is provided in the upper part of the interlock plate 4 into which the interlock plate 4 is inserted. In this oblong hole, the left end of the pin 19, which is loosely connected to the oblong hole 3a of the link 3, is loosely connected to the upper end of the pin 19 in FIG. Further, on the right side surface of the interlock plate 4, a holding plate 11 having an inverted L shape in FIG. 1 is provided, and this holding plate 11 is fixed to the mounting plate 1 with three machine screws 6a.

In the circuit breaker manual operation mechanism constructed as described above, when the push button 5 is pressed in FIG. 1 in which the circuit breaker is in the open state, the circuit breaker operates as shown in FIG. 4, similar to the conventional system shown in FIG. The lever 6 is pushed, the rotating shaft 20 rotates to the left, and the closing latch (not shown) comes off from the cam plate (not shown).
The circuit breaker is closed when an operating spring (not shown) returns.

Then, the shaft 7 swings clockwise by a link (not shown), and the on/off indicator 8 also swings as shown in FIG. 2, so that the link 9 connected to the right end of the triangular link 2 The triangular link 2 is pushed upward by the attached pin 16, and as a result, the triangular link 2 is
It is swung counterclockwise by pin 17 as shown in the figure. This swing causes the front end of triangular link 2 to descend, so link 3
is pushed downward by the pin 18, and the pin 19 fitted to the lower end of the link 3 is also pushed downward by the spring 10.
It descends as shown in the figure. Then, the interlock plate 4 whose upper oblong hole is engaged with this pin 19 is connected to the spring 1.
0 and the pin 19, and the lower end is loosely located between the back surface of the head 5b of the push button 5 and the front surface of the mounting plate 13, as shown in the figure. Therefore, in this state, even if the push button 5 is pressed inadvertently, the head 5a will not move back due to the interlock plate 4 at the rear of the head 5a, and the loading mechanism will not operate. It can be prevented.

[0018]

[Effects of the Invention] As described above, the present invention has an on/off indicator whose front surface swings up and down when the circuit breaker is turned on and off, and a closing operation mechanism for the circuit breaker by releasing the biased operation spring. In a manual operation mechanism for a circuit breaker, which is provided with a push button to operate, one end is connected to an on/off indicator via a link, and the other end engages with the push button when the front of the on/off indicator is moved upward, By installing an interlock plate that disengages the other end by moving the front face of the on/off indicator downward, we have made it impossible to operate the push button when the circuit breaker is in the closed state. It is possible to obtain a manual operating mechanism for a circuit breaker that can prevent the operating mechanism from being damaged and reduce the lifespan of the parts of the operating mechanism.

[Brief explanation of drawings]

FIG. 1 is a right side view showing an embodiment of a manual operation mechanism for a circuit breaker according to the present invention.

FIG. 2 is a right side view showing the operation of the manual operation mechanism of the circuit breaker of the present invention.

FIG. 3 is a left side view of FIG. 2.

FIG. 4 is a right side view showing a different function from FIG. 2 of the manual operation mechanism of the circuit breaker of the present invention.

FIG. 5 is a right side view of a circuit breaker to which a conventional circuit breaker manual operation mechanism is attached.

FIG. 6 is a right side view showing a manual operation mechanism of a conventional circuit breaker.

[Explanation of symbols]

1... Mounting plate, 2... Triangular link, 3, 9... Link, 4... Interlock plate, 5... Push button, 6... Lever, 7...
Stepped pin, 8...On/off indicator.

Claims (1)

[Claims] 1. An on/off indicator whose front surface swings up and down when the breaker is on/off, and a push button that releases an energized operation spring to operate the closing operation mechanism of the circuit breaker. In the manual operation mechanism of the circuit breaker provided, one end is connected to the on/off indicator via a link, and when the front surface of this on/off indicator moves upward, the other end engages with the push button, and the on/off indicator is connected to the on/off indicator via a link. A manual operation mechanism for a circuit breaker, characterized in that an interlock plate is provided that is released from the engagement by downward movement of the front surface of the indicator.