JP5630168B2 - Pull-out circuit breaker operation mechanism - Google Patents

Description

  The present invention relates to a pull-out circuit breaker loading / unloading operation mechanism for a high-pressure vacuum circuit breaker housed in a panel of a switchboard, and more particularly, to a loading / unloading operation mechanism caused by vibration associated with opening / closing operation of a breaker body. It relates to a lock structure that prevents malfunction.

As is well known, the pull-out type circuit breaker described above is equipped with a loading / unloading operation mechanism for moving the breaker body to the “running position” and “test position” by manual handle operation from the outside of the panel.
Next, FIG. 5 to FIG. 8 show a conventional configuration of a loading / unloading operation mechanism mounted on the circuit breaker body as an example of a draw-out type circuit breaker to be implemented by the present invention.

  First, in FIGS. 5A to 5C, 1 is a circuit breaker body of a vacuum circuit breaker, 2 is a vacuum valve corresponding to each phase of U, V, and W, and 3 is pulled back from the vacuum valve 2 of each phase. The main circuit contacts, 4 is the base of the circuit breaker body with built-in operation parts such as the circuit breaker opening / closing operation mechanism, and the insertion / removal operation mechanism, and 5 moves in the direction of arrow P on the rail of the cradle placed in the panel. The running wheel of the base portion 4, 6 is a drawer lever that is arranged on both the left and right side surfaces of the base portion 4 and is connected to a drive shaft, which will be described later, and 7 is connected to the loading / unloading operation mechanism from the front of the panel to connect the breaker body 1. A manual operation handle that moves to the "running position" and "test position", 8 is a lock cover that closes the insertion hole of the operation handle, and 8a is an opening / closing handle.

  Next, a schematic configuration of a loading / unloading operation mechanism mounted on the drawer type vacuum circuit breaker of FIG. 5 will be described with reference to FIGS. 6 (a) and 6 (b). That is, a drive shaft 10 extending in the left-right direction and coupled with the above-described pull-out lever 6 is disposed at both ends inside the base portion 4 (see FIG. 5) of the circuit breaker body. Is connected to an operation shaft 12 drawn to the front portion of the base portion 4 via a worm gear 11 comprising a worm 11a / worm wheel 11b. Further, the rotation range (rotation angle: 195 degrees) of the drawer lever 6 is restricted by a stopper mechanism, and the tip of the lever is placed on a pair of left and right moving guide members 9 installed on the side wall of a cradle (not shown) in the panel. It is guided and supported in the vertical direction via.

  With the above configuration, when the operation handle 7 inserted into the panel from the front is connected to the shaft end of the operation shaft 12 and rotated, the rotational force is transmitted to the drive shaft 10 via the worm gear 11 and is applied to both ends thereof. The combined drawer lever 6 rotates clockwise or counterclockwise, and in response to this, the breaker body 1 moves to the “operating position” and “test position” shown in FIGS. 6 (a) and 6 (b). To do.

  Next, FIG. 7 shows an assembly structure of the take-in / out operation mechanism centering on the worm gear 11 and FIG. 8 shows a connection structure between the operation handle 7 and the operation shaft 12. First, in FIGS. 7A to 7C, the operation shaft 12 is pivotally supported by a support 13 assembled to the frame of the base portion 4 with its tip directed forward, and the worm 11a and worm wheel 11b of the worm gear 11 are connected. It is connected to the drive shaft 10 which intersects perpendicularly. Reference numeral 8b denotes a return spring of the lock cover 8, and 14 denotes an auxiliary switch attached to the base portion.

  Here, as shown in FIGS. 8A to 8C, a coupling pin 12 a penetrating in the diameter direction of the shaft is coupled to the distal end portion of the operation shaft 12. On the other hand, a cylindrical socket 7a is provided at the tip of the operation handle 7, and the coupling pin 12a is inserted into the operation shaft 12 on the peripheral wall of the socket 7a (see (b) and (c)). An axial insertion groove 7b that fits at both ends is cut out. When the handle is manually rotated in a state where the operation handle 7 is inserted and connected to the operation shaft 12, the drive shaft 10 is rotated via the worm 11a and the worm wheel 11b of the worm gear, and the circuit breaker according to the rotation direction. The main body 1 moves to the “running position” and “test position” as described in FIG.

  By the way, in the conventional structure of the above-described insertion / removal operation mechanism, there may be a problem that the circuit breaker body starts to move freely from the “operating position” and “test position” as the circuit breaker is repeatedly opened and closed.

  That is, the worm gear has a larger reduction ratio than a spur gear mechanism and the like, and the backlash (play gap) between the worm 11a and the worm wheel 11b can be kept small. When the operation handle 7 is pulled out from the operation shaft 12 after moving to the “test position”, the drive shaft 10 is also constrained to that position by the meshing of the worm 11a and the worm wheel 11b and does not rotate freely. .

  However, when the circuit breaker body 1 is moved to the “running position” or “test position” and the opening / closing operation is repeated, the teeth of the worm 11a and the worm wheel 11b are engaged by the mechanical vibration generated by the opening / closing operation. It has been confirmed that a phenomenon occurs in which the alignment is momentarily disengaged, and a moment load due to the weight of the pull-out lever 6 (see FIG. 6) is added to cause a behavior such that the drive shaft 10 rotates finely. For this reason, with the conventional structure, the circuit breaker body mounted on the carriage is moved unexpectedly from the predetermined “operating position” or “test position” position due to mechanical vibration associated with the opening / closing operation. May cause malfunction.

  The present invention has been made in view of the above points, and its purpose is to add a simple locking part to the operation mechanism to prevent the breaker body from unexpectedly moving from the stop position when the operation handle is disconnected. It is an object of the present invention to provide a pull-out type circuit breaker insertion / removal operation mechanism which is improved so as to improve reliability.

In order to achieve the above object, according to the present invention, a pull-out type circuit breaker operation mechanism for moving a circuit breaker body to “running position” and “test position” in the panel by rotating a manual operation handle. A coupling pin is provided at the shaft tip of the operation shaft drawn forward through the worm gear on the drive shaft of the loading / unloading operation mechanism, and a grooved socket of the operation handle is inserted and connected to the coupling pin. In the one that operates the shaft,
Locking means for preventing rotation of the operating shaft when the operating handle is not connected to the operating shaft is provided , and the locking means of the operating shaft is engaged with the coupling pin of the operating shaft at the tip. A lock boss which is provided with a concave groove so as to be slidably inserted into the operation shaft, a return spring which presses and urges the lock boss toward the coupling pin, and a rotation which is arranged in the slide path so as to face the peripheral surface of the lock boss Assume that the assembly with the stop guide (Claim 1), the locking means and the operation handle are specifically configured in the following manner.
( 1 ) On the peripheral surface of the socket of the operation handle, an axial insertion groove portion that fits into the coupling pin at the insertion position to the operation shaft, and an engagement groove portion that extends in the circumferential direction connected to the insertion groove portion A substantially T-shaped pin engaging groove is formed by combining the two .
( 2 ) Surrounding the components of the locking means and providing a dust-proof case at the assembly location (Claim 3 ).

  According to the above configuration, when the operating handle is pulled out from the operating shaft of the loading / unloading operation mechanism when the breaker body is moved to the “running position” or “test position”, the lock boss returns to the locked position by the bias of the return spring. Then, the engaging concave groove at the tip is engaged with the coupling pin of the operation shaft, and the operation shaft is locked so as not to rotate from this position. As a result, even if mechanical vibration accompanying subsequent opening / closing operation of the circuit breaker is applied to the loading / unloading operation mechanism, the drive shaft connected to the operation shaft via the worm gear is also restrained at the stop position. Can be reliably prevented from starting malfunctioning from the “operating position” and “test position”.

  In addition, the lock boss is combined with a return spring and a non-rotating guide member, and is inserted into an operation shaft with a coupling pin so as to constitute a lock means for the loading / unloading operation mechanism. A lock mechanism can be configured.

  In addition, since a substantially T-shaped pin engagement groove is formed in the socket of the operation handle connected to the operation shaft, when the lock boss is pushed into the release position with the operation handle socket connected to the operation shaft and rotated, Since the coupling pin fits into the engaging groove that extends in the circumferential direction (this engaging groove functions as a bayonet groove), even if the handle is loosened during the rotation operation, the return spring force of the lock boss makes the handle Can prevent the lock boss from returning to the locked position.

  Furthermore, by installing a dustproof case that surrounds the components of the operating shaft locking means, it is possible to prevent problems such as dust entering into the gaps between components and causing the locking function and operation to become unstable. The reliability of the locking mechanism is improved.

FIG. 2 is a structural diagram showing a means for locking an operation shaft in an operation mechanism of an embodiment of the present invention, where (a) shows a state in which the operation handle is removed from the operation shaft, and (b) shows a main part structure showing a connection state of the operation handle. FIG. FIG. 2 is a structural diagram of the lock boss in FIG. 1, (a) and (b) are a side view and an end view of the lock boss, respectively, and (c) is a cross-sectional view taken along line XX in FIG. It is an assembly structure figure of the principal part of the taking in / out operation mechanism containing the lock boss | hub of FIG. 1, (a) is a top view, (b) is a front view, (c) is a side view. It is a block diagram of the application Example of FIG. 3, Comprising: (a) is a top view, (b) is a front view, (c) is a side view. BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of the high voltage | pressure vacuum circuit breaker which is the implementation object of this invention, Comprising: (a), (b), (c) is a front view, a side view, and a top view, respectively. It is a schematic block diagram of the taking-in / out operation mechanism with which the circuit breaker main body of FIG. 5 was equipped, Comprising: (a), (b) is a perspective view showing the state which moved the circuit breaker main body to the "operation position" and the "test position", respectively. It is. FIGS. 7A and 7B are a main part assembly structure diagram of the conventional loading / unloading operation mechanism of FIG. 6, in which FIG. 6A is a plan view, FIG. 8A and 8B are diagrams illustrating a connection structure between the operation shaft and the operation handle in FIG. 7, in which FIG. 7A is a state where the operation handle is removed from the operation shaft, FIG. 7B is a side view illustrating a connection state of the operation handle; (B) It is a fragmentary sectional view in alignment with arrow XX of a figure.

  Embodiments of the present invention will be described below based on the examples shown in FIGS. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 7, FIG. 8, and the description is abbreviate | omitted.

  The basic structure of the loading / unloading operation mechanism shown in the embodiment of FIGS. 1 and 3 is basically the same as that shown in FIGS. 7 and 8, but the loading / unloading operation mechanism is not connected to the operation shaft 12. As a locking mechanism for locking at that position, in the illustrated embodiment, a lock boss 15 for locking is newly provided on the axis of the operation shaft 12 connected to the drive shaft 10 via the worm gear 11. .

  Here, the lock boss 15 is a cylinder as shown in FIGS. 2A to 2C, and an engagement groove 15 a having a semicircular cross section fitting with the coupling pin 12 a of the operation shaft 12 is formed at the tip thereof. It is formed radially at intervals of 45 degrees, has a collar part that is one diameter larger than the cylinder body at the rear end, and a flat surface 5b that is cut parallel to the left and right is formed on the outer periphery of the collar part. . The engaging groove 15a is not limited to a semicircular cross-sectional shape, and may be a square groove. Further, a step is formed in the middle part of the lock boss 15 in the body, and a return spring (compression coil spring) 15c shown in FIG.

  As shown in FIG. 1A, the lock boss 15 is slidably fitted on the shaft of the operation shaft 12 and is opposed to the outer peripheral flat surface 15b on the side of the operation shaft 12. A pair of detent guides 16 extending in the axial direction and guiding and supporting the lock boss 15 from both sides are provided. With this configuration, in the state of FIG. 1A that is not connected to the operation handle 7, the lock boss 15 guided by the anti-rotation guide 16 is pushed forward by the spring force of the return spring 15c as shown in FIG. The concave groove 15a fits into the coupling pin 12a of the operation shaft 12 and holds the operation shaft 12 in this position. The return spring 15c is set to have a strong spring load so that it does not come off from the coupling pin 12a of the operation shaft 12 even if mechanical vibration and impact force generated by the opening / closing operation of the vacuum circuit breaker are applied. .

  As a result, even if the circuit breaker body 1 is moved to the “running position” and “test position” (see FIG. 6) and the circuit breaker is repeatedly opened and closed, the mechanical vibrations caused by the switching operation are caused. As a result, it is possible to reliably prevent the drive shaft 10 and the pull-out lever 6 from rotating slightly and unexpectedly moving the breaker body from a fixed position.

  On the other hand, with respect to the operation handle 7 that is connected to the operation shaft 12 and moves the circuit breaker body to the “running position” and “test position”, the peripheral surface of the socket 7a of the handle is as shown in FIG. A substantially T-shaped pin in which an axial insertion groove 7c-1 opened toward the tip of the socket and a semicircular engagement groove 7c-2 extending in the circumferential direction connected to the insertion groove 7c-1 are combined. An engagement groove 7c is formed.

  When the circuit breaker body 1 is moved to the “running position” and “test position” (see FIG. 6) by rotating the operation handle 7 inserted into the panel from the front, as shown in FIG. The socket 7a of the operating handle 7 is inserted into the operating shaft 12 and pushed in. As a result, the lock boss 15 inserted into the operation shaft 12 by the socket 7a is retracted against the return spring 15c, and the engagement between the lock boss 15 and the coupling pin 12a is released. Subsequently, when the operating handle 7 is rotated clockwise or counterclockwise, the coupling pin 12a of the operating shaft 12 moves to the engaging groove portion 7c-2 of the pin engaging groove 7c described above. Therefore, even if the axial pushing force applied to the operating hand 7 is loosened in this state, the socket 7a does not come out of the operating shaft 12 and the lock boss 15 does not return to the original locking position, and the handle rotation operation Can be done easily. When the operation handle 7 is pulled out after the circuit breaker body is moved, the lock boss 15 receives the spring force of the return spring 15c and returns to the locked position, and the operating shaft 12 is locked at this position and locked so as not to rotate. To do.

  Next, FIG. 4 shows an embodiment according to claim 4 of the present invention as an application example of the first embodiment. That is, in the first embodiment, the components such as the lock boss 15, the return spring 15 c, and the anti-rotation guide 16 constituting the locking mechanism are exposed as they are in the internal space of the base portion 4 of the circuit breaker body. For this reason, if foreign matter such as dust enters the gaps between these parts, the lock boss 15 may become unstable due to the twisting and locking function.

  Therefore, in the second embodiment, as shown in FIGS. 4A to 4C, the lock boss 15, the return spring 15 c, and the detent guide 16 that constitute the locking mechanism of the operation shaft 12 are surrounded. A box-shaped dustproof case 17 is additionally provided in front of the worm gear 11 so as to prevent entry of foreign matters such as dust. Thereby, the reliability with respect to the locking function and operation | movement of the operating shaft 12 can be improved.

DESCRIPTION OF SYMBOLS 1 Circuit breaker body 6 Drawer lever of taking in / out operation mechanism 7 Operation handle 7a Socket 7c Pin engaging groove 10 Drive shaft 11 of taking in / out operating mechanism Worm gear 12 Operation shaft 12a Coupling pin 15 Lock boss 15a Engaging concave groove 16 Non-rotating guide 17 Dustproof case

Claims (3)

This is a pull-out circuit breaker loading / unloading mechanism that moves the breaker body to the “operating position” and “test position” in the panel by rotating the manual operation handle. A worm gear is attached to the drive shaft of the loading / unloading mechanism. A coupling pin is provided at the shaft tip of the operation shaft drawn forward through, and a grooved socket of the operation handle is inserted and connected to the coupling pin to rotate the drive shaft.
Locking means for preventing rotation of the operating shaft when the operating handle is not connected to the operating shaft is provided , and the locking means of the operating shaft is engaged with the coupling pin of the operating shaft at the tip. A lock boss which is provided with a concave groove so as to be slidably inserted into the operation shaft, a return spring which presses and urges the lock boss toward the coupling pin, and a rotation which is arranged in the slide path so as to face the peripheral surface of the lock boss A pull-out type circuit breaker operating mechanism, characterized by comprising a stop guide assembly . The insertion / removal operation mechanism according to claim 1, wherein the peripheral wall surface of the socket of the operation handle has an axial insertion groove portion that fits into the coupling pin at the insertion position into the operation shaft, and is connected to the insertion groove portion in the circumferential direction. A pull-out type circuit breaker insertion / removal operation mechanism characterized in that a substantially T-shaped pin engagement groove is formed by combining extending extension groove portions. 2. A drawer type circuit breaker loading / unloading mechanism according to claim 1, wherein a component of the locking means is enclosed and a dustproof case is provided at the assembly position.