JP2011100697A - Operation mechanism of circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation mechanism which makes a closing operation by manual operation impossible in a closed circuit state of a circuit breaker. <P>SOLUTION: The circuit breaker includes a closing operation rod 33 for manually performing the closing operation, a closing operation hole 32 provided to a front panel 31 which the closing operation rod 33 is inserted into, a putting-in paddle 29 provided while facing the closing operation hole 32, a rotatable putting-in shaft 28 which the putting-in paddle 29 is fixed to, a closing spring 18 latched together with the putting-in shaft 28, and a main link 12 which rotates while interlocking with force-store and force-release operations of the closing spring 18. In the operation mechanism of the circuit breaker, the closing operation hole 32 is closed by a shutter 56 which is connected to the main link 12 by a plurality of links 50, 51 and 54 when force-store operation of the closing spring 18. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an operating mechanism for a circuit breaker such as a vacuum circuit breaker, and more particularly to an operating mechanism for a circuit breaker that prevents a closing operation to further close in a closed state.

  In a conventional vacuum circuit breaker, a closing spring and a breaking spring are stored by an electric motor, and an opening / closing operation is performed (for example, see Patent Document 1).

  As shown in FIG. 4, this type of vacuum circuit breaker is divided into an operation mechanism section 1a and a blocking section 1b. In the figure, the hatched pins are fixed and the white pins are movable. The same applies to the following figures.

  In the operation mechanism portion 1a, a rotatable cam shaft 3 is provided at an intermediate portion in the vertical direction of the mechanism frame 2, and a closing cam 4 is fixed. The first, second and third links 5, 6, 7 for transmitting the power of the charging cam 4 are connected by movable pins 8, 9 on the right side of the charging cam 4 in the figure. Is provided with a roller 10 for rotating the outer periphery of the closing cam 4. A rotatable triangular main link 12 fixed to the main shaft 11 is connected to the end of the third link 7 by a movable pin 13. The end of the first link 5 is fixed by a fixing pin 14.

  One end of the fourth link 15 is fixed to the end of the camshaft 3, and the movable pin 16 is fixed to the other end. The movable pin 16 is fixed to the other end of a closing spring 18 having one end fixed to the fixed pin 17. A rotatable fan-shaped trip catch 21 fixed to a fixing pin 20 for holding or operating a vacuum valve 19 to be described later is provided above the charging cam 4 in the figure. The trip catch 21 is provided with a rotatable trip shaft 22 for rotating the trip catch 21 and a return spring 23 for returning the rotated state. The trip catch 21 and the movable pin 8 are connected by a fifth link 24.

  Below the drawing cam 4, there is provided a turnable feeding catch 26 in which an intermediate portion for holding the stored energy of the closing spring 18 is fixed to the fixing pin 25. The closing catch 26 is locked at one end to a movable pin 27 fixed to the closing cam 4, and the other end is locked to a rotatable charging shaft 28.

  The input shaft 28 is provided with a U-shaped input paddle 29 for rotating the input shaft 28. A closing coil 30 for performing a closing operation with an electric signal is provided at one lower end of the closing paddle 29 in the figure. The other end of the input paddle 29 faces a closing operation hole 32 provided in the front panel 31. A closing operation rod 33 that can push the other end of the closing paddle 29 in the left direction in the drawing and rotate the closing shaft 28 can be passed through the closing operation hole 32. That is, the closing operation can be performed manually.

  An open spring 34 that rotates the main link 12 in the opening direction is provided below the main link 12 in the figure. Further, one end of the wipe spring 35 is connected by a movable pin 36. One end of a rotatable drive lever 38 having an intermediate portion fixed by a fixed pin 37 is connected to the other end of the wipe spring 35 by a movable pin 39. The main link 12 rotates in conjunction with the accumulating and releasing operations of the open spring 34 and the closed spring 18 to rotate the drive lever 38.

  The blocking portion 1b is provided with a vacuum valve 19 having a pair of contact points 40 that can be contacted and separated, and a movable shaft 41 and an insulating operation rod 42 are connected to the movable side. The other end of the drive lever 38 is connected to the insulating operation rod 42 by a movable pin 43.

  Here, FIG. 4 shows the completion of the closed state, and the closing cam 4 is rotated counterclockwise by an electric motor (not shown), and both the closed spring 18 and the open spring 34 are in the accumulated state. This is to correspond to O (open circuit) -C (closed circuit) O (open circuit) which is the duty of the circuit breaker.

  In this state, as shown in FIG. 5, at the time of maintenance inspection or the like, the closing operation rod 33 is inserted from the outside of the front panel 31 into the closing operation hole 32 and is brought into contact with the closing paddle 29 and rotated counterclockwise. Can be made. When the input paddle 29 is rotated, the input shaft 28 is also rotated counterclockwise, the engagement with the input catch 26 is released, and the input cam 4 attempts to rotate counterclockwise. However, since it is in a closed state, the closing cam 4 is prevented from rotating and the closing spring 18 is released. This is a so-called empty closing operation.

  Note that the closing coil 30 that performs a closing operation by an electric operation cannot be closed by an interlock mechanism (not shown) in a closed state.

JP 2001-143578 A (3rd page, FIG. 1)

  In the above-described conventional circuit breaker operating mechanism, a manual closing operation is possible when the circuit breaker is closed. When the closing operation is performed, the closing spring 18 is released, and the links 5, 6, 7 and There is a problem that an excessive load is applied to the operation mechanism such as the pins 8 and 9 to cause damage.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a circuit breaker operating mechanism that disables the circuit closing operation by manual operation when the circuit breaker is closed.

  In order to achieve the above object, the circuit breaker operating mechanism of the present invention includes a closing operation rod for manually closing, a closing operation hole provided in a front panel into which the closing operation rod is inserted, and the closing circuit. A closing paddle facing the operation hole, a rotatable closing shaft to which the closing paddle is fixed, a closing spring locked to the closing shaft, and an accumulating and releasing force of the closing spring. In the circuit breaker operation mechanism having a main link that rotates in conjunction with the operation, the closing operation hole is blocked by a shutter connected to the main link by a plurality of links when the closing spring is stored. Features.

  According to the present invention, in the closed state, the closed spring cannot be released by manual operation, and the closed operation can be disabled.

The principal part expanded side view which shows a part of structure of the structure of the operation mechanism of the circuit breaker which concerns on Example 1 of this invention. FIG. 3 is an enlarged side view of a main part showing a cross section of a part of the operation mechanism of the circuit breaker according to the first embodiment of the present invention. The principal part expanded side view which shows a part of structure of the structure of the operation mechanism of the circuit breaker which concerns on Example 2 of this invention. The side view which shows and shows a part of structure of the conventional circuit breaker. The principal part expanded side view which shows a part of structure of the operation mechanism of the conventional circuit breaker in a cross section.

  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 FIGS. FIG. 1 is an enlarged side view of a principal part showing a cross-section of a part of the configuration of a circuit breaker operating mechanism according to a first embodiment of the present invention, and FIG. 2 is a circuit breaker operating mechanism according to a first embodiment of the present invention. It is a principal part expanded side view which cuts and shows a part explaining operation | movement of (2). In addition, the same code | symbol was attached | subjected about the component similar to the past. Moreover, since the structure of a circuit breaker is the same as that of the past, the detailed description is abbreviate | omitted.

  As shown in FIG. 1, the mechanism frame 2 is provided with a rotatable camshaft 3 and a closing cam 4 is fixed. The closing cam 4 is connected with second and third links 6 and 7 for transmitting power by a movable pin 9, and a roller 10 that rotates the outer peripheral portion of the closing cam 4 is provided on the outer periphery of the movable pin 9. It has been. A rotatable triangular main link 12 fixed to the main shaft 11 is connected to the end of the third link 7 by a movable pin 13.

  One end of the fourth link 15 is fixed to the camshaft 3, and the movable pin 16 is fixed to the other end. One end of a closing spring 18 that performs a closing operation is fixed to the movable pin 16.

  The closing cam 4 is provided with a rotatable closing catch 26 in which an intermediate portion for holding the stored energy of the closing spring 18 is fixed to a fixing pin 25. The closing catch 26 is locked at one end to a movable pin 27 fixed to the closing cam 4, and the other end is locked to a rotatable charging shaft 28.

  The input shaft 28 is provided with a U-shaped input paddle 29 for rotating the input shaft 28. A closing coil 30 for performing a closing operation with an electric signal is provided at one lower end of the closing paddle 29 in the figure. The other end of the input paddle 29 faces a closing operation hole 32 provided in the front panel 31. A closing operation rod 33 capable of pushing the other end of the insertion paddle 29 in the left direction in the figure can be passed through the closing operation hole 32.

  On the main shaft 11, an intermediate portion of a hexagonal sixth link 50 is rotatably fixed. One end of the sixth link 50 is fixed to the main link 12 by a movable pin 36, and one end of a plate-like seventh link 51 is connected by a movable pin 52 to the other end middle portion. One end of an eighth link 54 having an intermediate portion fixed by a fixed pin 53 is connected to the other end of the seventh link 51 by a movable pin 55. The other end of the eighth link 54 is connected to a connecting plate 57 fixed to the lower part of the plate-like shutter 56 by a movable pin 58. The shutter 56 is disposed substantially parallel to the front panel 31.

  The connecting plate 57 is provided with an oval opening 59 so that the movable pin 58 can move. A guide plate 60 is fixed to the upper portion of the shutter 56 shown in the figure, and a fixing pin 62 fixed to the mechanism frame 2 moves through an oval opening 61 provided in the guide plate 60, thereby moving the shutter 56 vertically. It can be moved in the direction. The shutter 56 is provided with a manual operation hole 63 through which the closing operation rod 33 can penetrate in an intermediate portion. The manual operation hole 63 is not opposed to the closing operation hole 32 and is located in the lower part of the figure. Further, a return spring 64 that is urged so as to pull the shutter 56 downward in the figure is provided.

  Below the main link 12, one end of the wipe spring 35 is connected by a movable pin 36. The other end of the wipe spring 35 is connected to the movable side of the vacuum valve. Here, the state of FIG. 1 is the same as that of FIG. 5 and indicates the completion of the closed circuit state.

  Thereby, in the closed state, the closing operation rod 33 can be inserted into the closing operation hole 32 from the outside of the front panel 31, but cannot contact the shutter 56 and push the closing paddle 29. That is, the closing shaft 28 to which the closing paddle 29 is fixed can be rotated to make it impossible to perform the closing operation manually.

  Next, a case where the circuit is opened will be described with reference to FIG.

  When the circuit breaker is opened by an unillustrated open spring, the closing cam 4 rotates counterclockwise, and the second and third links 6 and 7 are refracted into the recess of the closing cam 4. Further, the main link 12 and the sixth link 50 rotate in the clockwise direction, and the shutter 56 is lifted upward in the drawing via the seventh link 51, the eighth link 54, and the connecting plate 57. Then, the positions of the manual operation hole 63 provided in the shutter 56 and the closing operation hole 32 provided in the front panel 31 coincide.

  As a result, the closing operation rod 33 can be inserted into the closing operation hole 32 and the manual operation hole 63, brought into contact with the making paddle 29, and the making shaft 28 can be rotated counterclockwise. When the closing shaft 28 rotates, the locking with the closing catch 26 is released, and the closing spring 18 is released to close the circuit breaker.

  In addition, the front panel 31 may be removed at the time of inspection. For this reason, if an indication indicating that manual operation is not possible is written in the manual operation hole 63 portion on the surface of the shutter 56 facing the front panel 31, unnecessary operation of closing can be prevented. Here, since the manual operation hole 63 in the closed state is at a position facing the axial side surface of the closing shaft 28, the closing paddle 29 can be pushed even if the closing operation rod 33 is inserted from the manual operation hole 63. Therefore, erroneous operation is prevented.

  According to the circuit breaker operating mechanism of the first embodiment, when the circuit breaker is in the closed state, the closing operation hole 32 provided in the front panel 31 is covered with the shutter 56 connected to the main link 12. The closing operation rod 33 for performing the closing operation by manual operation cannot be inserted from the closing operation hole 32, and the closing spring 18 can be prevented from being released. That is, the closing operation can be disabled in the closed state.

  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. 3 is an enlarged side view of the essential part showing a part of the configuration of the operating mechanism of the circuit breaker according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in the shape of the shutter. In FIG. 3, 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. 3, the shape of the shutter 56 is L-shaped, and the end of the insertion paddle 29 is locked to the L-shaped end portion 56 a of the shutter 56.

  Thus, even if the closing operation rod 33 is inserted from the closing operation hole 32 and one end of the closing paddle 29 is pushed, the other end is in contact with the L-shaped end portion 56a, and therefore the closing of the closing paddle 29 is prevented. Can do. In the first embodiment, assembly adjustment work for matching the positions of the closing operation hole 32 and the manual operation hole 63 is necessary. However, this is not necessary, and the assembly work can be facilitated.

  According to the operation mechanism of the circuit breaker of the second embodiment, in addition to obtaining the same effect as that of the first embodiment, the assembly work can be facilitated.

DESCRIPTION OF SYMBOLS 1a Operation mechanism part 1b Blocking part 2 Mechanism frame 3 Camshaft 4 Input cams 5, 6, 7, 12, 15, 24, 50, 51, 54 Links 8, 9, 13, 16, 27, 36, 39, 43, 52, 55, 58 Movable pin 10 Roller 11 Main shaft 14, 17, 20, 25, 37, 53, 62 Fixed pin 18 Input spring 19 Vacuum valve 21 Trip catch 22 Trip shaft 23 Return spring 26 Input catch 28 Input shaft 29 Input Paddle 30 Closing coil 31 Front panel 32 Closing operation hole 33 Closing operation rod 34 Opening spring 35 Wiping spring 38 Drive lever 40 Contact 41 Movable shaft 42 Insulating operation rod 56 Shutter 56a L-shaped end 57 Connecting plate 59, 61 Opening hole 60 Guide plate 63 Manual operation hole 64 Return spring

Claims (4)

A closing operation rod for manually closing the circuit;
A closing operation hole provided in a front panel into which the closing operation rod is inserted;
An input paddle provided opposite to the closing operation hole;
A rotatable input shaft to which the input paddle is fixed;
A closing spring locked to the closing shaft;
In the operating mechanism of the circuit breaker having a main link that rotates in conjunction with the accumulating and releasing operation of the closing spring,
An operating mechanism for a circuit breaker, wherein the closing operation hole is closed by a shutter connected to the main link by a plurality of links when the closing spring is stored.   2. The circuit breaker operating mechanism according to claim 1, wherein a manual operation hole is provided in the shutter so as to face the closing operation hole when the closing spring is released. A closing operation rod for manually closing the circuit;
A closing operation hole provided in a front panel into which the closing operation rod is inserted;
A closing paddle that is provided opposite to the closing operation hole and is in contact with the closing operation rod;
A rotatable input shaft to which the input paddle is fixed;
A closing spring locked to the closing shaft;
In the operating mechanism of the circuit breaker having a main link that rotates in conjunction with the accumulating and releasing operation of the closing spring,
An operating mechanism for a circuit breaker, wherein the closing paddle is prevented from rotating at an end of a shutter connected to the main link by a plurality of links when the closing spring is stored.   The circuit breaker operating mechanism according to any one of claims 1 to 3, wherein the shutter is marked on the surface facing the front panel as being incapable of closing operation.

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