JPH0620325B2 - Spring release device for draw-out circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention mainly relates to an electric motor used in a high-speed recharging type.
The present invention relates to a spring release device for a spring-loaded pull-out circuit breaker.

(Prior Art) FIGS. 7 and 8 are views showing an embodiment of a spring release device for a draw-out type circuit breaker according to the prior art. FIG. 7 shows the energy storage state at a test position, and FIG. The figures show the released states associated with the pulling operation from the test position, and a high-speed re-closing type vacuum circuit breaker is applied to the circuit breaker. In FIG. 7, the operating shaft 3 of the drawer type circuit breaker 2 (hereinafter simply referred to as circuit breaker 2) at the test position with a sufficient insulation distance from the connection position with the bus bar of the switchboard 1 is not shown in the figure. The turning spring is biased counterclockwise by the closing spring in the state, and the rotation is restrained by the engagement of the roller 4a included in the lever 4 integrated with the operation shaft 3 and the closing lever 5. On the other hand, an unillustrated shut-off pole (vacuum valve) connected to the open / close shaft 6 located above the operation shaft 3 is shut off, and therefore shuts off from the roller 7a provided on the lever 7 integrated in the open / close shaft 6. The lever 8 is in a tripped state. Both the closing lever 5 and the shut-off lever 8 are formed in a V shape pivotally supported at the central portion, and one end of each is engageable with the roller 4a of the operation shaft 3 and the roller 7a of the opening / closing shaft 6 as described above. I'm running. Both opening and closing levers 5, 8
Is pivoted with the other ends facing each other,
An engaging coil 9 and a trip coil 10 that can be engaged are provided on each of the lever portions on the other end side. The leg pieces on the other end sides of the closing and closing levers 5 and 8 facing each other are provided with a biasing device 20 of a closing spring whose front ends engage with both leg pieces at the same time. It is composed of a conversion lever 12, an engagement rod 13, a compression spring 14 and an engagement piece 15. The operating rod 11 is arranged so that its tip end engages with the both leg pieces described above by the pushing operation from the front side (right side in the figure) of the circuit breaker 2, and is freely axially movable to the frame body 2a of the circuit breaker 2. Is supported by. The direction-changing lever 12 is provided at a connecting portion between the operating rod 11 and the engaging rod 13, and an intermediate portion thereof is pivotally supported by the frame body 2a.
The engaging rod 13 is supported in a vertical direction via a metal fitting 16 attached to the frame 2a, and is urged downward by a compression spring 14 wound around itself between the metal fittings 16. . The engaging piece 15 is mounted on the base 1a of the switchboard 1 on the front side of the engaging rod 13, and is engaged with the engaging rod 13 by the pulling operation of the circuit breaker 2 from the test position to push it up. It has a shape with a slope before and after. The compression spring 14 may be omitted if the operating rod 11 can be pulled to the front side at the same time when the engaging rod 13 is lowered by its own weight.

In the above structure, the urging device 20 operates only by pulling out the circuit breaker 2 from the test position to the outside of the panel regardless of whether or not the closing spring stores energy, and also operates by pushing the operating rod 11. It is about to do. Explaining the withdrawal from the closing spring energy storage state, by pulling out the circuit breaker 2, the engaging rod 13 is engaged with the engaging piece 15 and pushed up, and the operating rod 11 is pushed up as the engaging rod 13 is pushed up. It moves rearward and simultaneously engages with the opposing leg pieces of the closing lever 5 and the cutoff lever 8. By this engagement, one end of the closing lever 5 and the roller 4a of the operating shaft 3 are disengaged, the operating shaft 3 rotates counterclockwise to release the closing spring, and at the same time, a connecting rod (not shown) is opened. The opening / closing shaft 6 is rotated in the counterclockwise direction to instantly insert the blocking pole. However, at this time, since the blocking lever 8 is also operating simultaneously, the engagement between the roller 7a of the opening / closing shaft 6 and the blocking lever 8 cannot be established, and
Therefore, the blocking pole column returns to the blocking state. At this time, although not shown, since the control circuit of the electric actuator for energizing the closing spring is in the open state, the energizing operation of the closing spring is not performed, so that both the closing spring and the breaking spring are released. It becomes a state.

(Problems to be Solved by the Invention) Since the circuit breaker 2 is provided with an interlock for preventing reclosing to prevent the closing lever 5 from operating in order to prevent reclosing in the closed state, In the spring releasing device of the prior art described above, since the movement of the operating rod 11 is blocked by the closing lever 5 when the circuit breaker 2 is in the closed state, the interlock is manually pulled off first. The circuit breaker 2 had to be pulled out of the switchboard.

If the circuit breaker 2 is forcibly pulled out of the switchboard without performing the above operation and without knowing that the circuit breaker 2 is in the closed state, the mechanism parts such as the release device and the closing lever 5 will not be damaged or released. Moreover, there was a problem that it was dangerous because it remained in the closed state.

The present invention solves the above-mentioned problems of the prior art, even when the circuit breaker is in the closed state and the closing spring is in the stored state, without damaging the mechanism parts such as the release device and the closing lever, An object of the present invention is to provide a spring release device for a draw-out type circuit breaker that can draw the circuit breaker outside the switchboard.

(Means for Solving the Problems) In order to solve the above problems, the present invention is accommodated in a closed type switchboard so as to be able to be drawn out, and is biased by an energizing closing spring and a shutoff spring, respectively. In a drawer type circuit breaker that is turned on or off, an engaging rod that is supported by the circuit breaker so as to be movable up and down and a lower end of the circuit breaker contacts the base of the switchboard and moves with the circuit breaker; and the base of the switchboard. An engaging piece having a two-step step in the pull-out direction at a position that is in contact with the engaging bar and has passed the test position in the pull-out direction of the circuit breaker; When the push-up lever is pushed up to the position of engaging with, the shut-off lever that restrains the rotation of the open-close shaft that is rotated in the shut-off direction of the circuit breaker by the shut-off spring is released from the restraint of the open-close shaft. With a shut-off operating lever that drives in the direction An operation in which the engagement spring is rotated in the closing direction of the circuit breaker by the closing spring in conjunction with the engagement rod when the engagement rod is pushed up to a position where it engages with the higher step surface of the engagement piece. The closing lever that restricts the rotation of the shaft is configured by a closing operation lever that drives in a direction to release the restriction of the operation shaft.

(Operation) The present invention is a spring closing type circuit breaker mounted on a trolley that is housed in a switchboard and can be pulled out along a base when pulling it out of the switchboard from a test position. Even when the spring is in the stored state and the circuit breaker is in the closed state, it is a device that releases the closing spring and the breaking spring by pulling out from the test position.

The circuit breaker is provided with an engaging rod that is supported by the circuit breaker in a vertical direction and is urged downward, and an engaging piece that is attached to the base of the switchboard and that has two steps of height and level. When pulled out from the test position, the mechanical device is engaged with the engaging piece and is pushed up to a position where the engaging rod first engages with the lower step surface of the engaging piece, and is thereby rotated. When the circuit breaker is in the closed state by the rotation of, the breaking spring is automatically released to release the breaking spring.

Next, when the circuit breaker is further pulled out, the engaging rod is pushed up to a position where it engages with the higher step surface of the engaging piece, and the closing mechanism causes the closing spring to rotate by the rotation of the transmission mechanism. Since it is in the released state, there is no damage to the release device due to erroneous operation as in the conventional example, and it is possible to provide a highly reliable spring release device for a drawer type circuit breaker.

(Embodiment) FIG. 1 to FIG. 3 are side views of an essential part showing an embodiment of the present invention. In FIG. 1, the power storage state at the test position of the circuit breaker 2 in the switchboard 1 is shown in FIG. In FIG. 2, the engaging rod 13 is the engaging piece 1.
5 shows the state in which the circuit breaker 2 is shut off by being pushed up to the low lift position by engaging with 5, and in FIG.
5 is pushed up to the high lift position by engaging with 5, and the released state from the test position is shown. The circuit breaker 2 is a high-speed re-closing type vacuum circuit breaker. FIG. 9 is an exploded perspective view for facilitating the understanding of the structure of the main part of the embodiment of the present invention.

In FIG. 1, the operating shaft 3 of the circuit breaker 2 at the test position of the switchboard 1 is biased counterclockwise by a closing spring (not shown) in a stored state, and a lever 4 integrated with the operating shaft 3 is provided. The rotation is restrained by the engagement between the roller 4a provided in and the closing lever 5.

On the other hand, an unillustrated shut-off pole (vacuum valve) connected to the opening / closing shaft 6 located above the operation shaft 3 is in the closed state,
Due to the engagement of the roller 7a provided on the lever 7 integrated with the opening / closing shaft 6 and the blocking lever 8, the counterclockwise rotation of the lever 7 by the blocking spring (not shown) is restricted.

The closing lever 5 and the breaking lever 8 which are formed in a substantially L-shape and are rotatably supported by the frame body 2a of the breaker 2 have one end portions thereof, as described above, of the roller 4a of the operating shaft 3. Also, the roller 7a of the opening / closing shaft 6 can be engaged.

Further, an engaging coil 9 and a trip coil 10 which can be engaged are provided on each of the leg pieces which are the other end side lever portions of the closing and opening levers 5, 8.

The engagement rod 13 is supported in a vertical direction via a metal fitting 16 attached to the frame 2a, and is urged downward by a compression spring 14 wound around itself between the metal fittings 16. There is.

The engaging piece 15 is attached on the base 1a of the switchboard 1 on the front side of the circuit breaker 2 in the direction of drawing the circuit breaker 2 and the lower end of the circuit bar 2 is pulled out from the test position. For engaging with the roller 13a provided on the engaging portion and pushing it up to a position where it engages with the lower step surface of the engaging piece and a position where it engages with the higher step surface of the engaging piece. It has a shape with a gradient in the front and back.

The closing lever 21 is rotatably supported by the frame 2a at its central portion, has a slightly curved long hole portion at one end thereof, and has the other end engaged with the leg piece portion of the closing lever 5 described above. It is possible.

As shown in detail in FIG. 9, the shutoff operation lever 22 integrally includes two levers 22a and 22b, one end of which is rotatably supported by the frame body 2a.
The other end of 2a is engageable with the leg piece of the shutoff lever 8, and the other lever 22b has a width L _{1 at} the other end, as shown in detail in FIG. The pin 22c shaped like a semicircle having is fixed.

As shown in FIGS. 5 and 9, the connecting plate 23 has a rectangular plate shape and has a round hole 23a at one end thereof and a central round hole 23b at the other end thereof with which the half-moon shaped pin 22c is engaged. And a keyhole-like hole 23d consisting of a rectangular hole 23c having a width of L ₂ and connected to the lower right part thereof and extended to the other end.

There is relationship L ₁ <L ₂ between the width L ₂ of the width L ₁ and the key hole-shaped hole 23d of the pin 22c, and the other lever 22b and the connecting plate 23 of the shutoff lever 22, As shown in FIG. 6, the pin 22c is engaged, and the connecting plate 23 has the pin 22 when the round hole 23b is engaged with the pin 22c.
From the position shown in FIG. 6 in which the semicircular portion of the pin 22c and the hole 23c face each other, it is rotatable about the rotation axis c.
It is movable in the direction indicated by arrow 23e.

The operation lever 24 is rotatably supported by the frame 2a at its central portion, and is connected to a long hole provided at one end thereof by a pin provided at the upper end of the engaging rod 13. At the other end, a slightly curved elongated hole provided at one end of the closing operation lever 21 and an operation rod 24a to be inserted into the round hole 23a of the connecting plate 23 are provided.

A part of the slightly curved long hole portion provided at one end of the closing operation lever 21 is machined such that its hole width is larger than the diameter of the operation rod 24a along the rotation locus of the operation rod 24a of the operation lever 24. The hole is curved from the middle.

In the above structure, when the circuit breaker 2 in the energy storage state at the test position shown in FIG. 1 is pulled out of the switchboard 1 from the test position, the roller 13a of the engagement rod 13 causes the engagement piece 1 to move.
By ascending the gradient of 5, the engaging rod 13 is pushed up to a position where it engages with the lower step surface of the engaging piece shown in FIG. 2, and the breaker 2 is in a closed state.

That is, as the engaging rod 13 is pushed up, the operating lever 24 rotates counterclockwise, and the operating rod 24a operates the mechanism including the connecting plate 23 and the cutoff operating lever 22. The pin 22c rotates counterclockwise about the rotation center, the cutoff operation lever 22 rotates clockwise, the lever 22a pushes the leg piece of the cutoff lever 8, and the cutoff lever 8 rotates counterclockwise. .

The engagement with the roller 7a is released by the rotation of the shutoff lever 8, and the restraint of the rotation of the lever 7 in the counterclockwise direction is released. As a result, the opening / closing shaft 6 rotates in the counterclockwise direction. In the state shown in the figure, the circuit breaker 2 enters the cutoff state. At this time, however, the interlock for preventing re-closing, which mechanically restrains the movement of the plunger of the closing coil 9 (not shown), is released, but the closing spring of the circuit breaker 2 is still in the stored state. ing.

Further, in the closing operation lever 21, the operating rod 24a moves along the long hole portion of the closing operation lever 21 during the above-mentioned operation, but the long hole portion in the middle is the operation rod 2 as described above.
Since it is processed along the rotation locus of 4a, it does not rotate. In the state shown in FIG. 2, the operating rod 24a has moved to just before the bending point of the elongated hole portion of the closing operation lever 21. Since the closing operation lever 21 does not rotate, the engagement between the closing lever 5 and the roller 4a of the lever 4 integrated with the operation shaft 3 is still established in the state shown in FIG.
The rotation of the operation shaft 3 is restricted.

In the state shown in FIG. 2, the positional relationship between the pin 22c fixed to the other lever 22b of the shutoff operation lever 22 and the connecting plate 23 is as shown in FIG. 6, and the semicircular portion of the pin 22c and the long hole shape are formed. The holes 23c face each other, and the connecting plate 23 can move from this position in the direction indicated by the arrow 23e.

When the circuit breaker 2 is further pulled out from the state shown in FIG. 2, the state shown in FIG.
By raising the slope of the step, the engaging rod 13 is pushed up to the position where it engages with the higher step surface of the engaging piece shown in FIG. 3, and the operating lever 24 is further moved counterclockwise. Rotate.

At this time, the semicircular portion of the pin 22c of the cutoff operation lever 22 enters the rectangular hole 23c of the connection plate 23, so that the connection plate 23 only moves in the direction of the arrow 23e shown in FIG. Does not rotate.

On the other hand, since the operation rod 24a of the operation lever 24 rotates counterclockwise along the slightly curved curved hole of the closing operation lever 21, the closing operation lever 21 rotates clockwise. . That is, as described above, the closing operation lever 21 maintains the original position without rotating while the engagement rod 13 is changed from the state shown in FIG. 1 to the state shown in FIG. It rotates clockwise from the state shown in the figure to the state shown in FIG.

When the closing operation lever 21 rotates clockwise, the leg portion of the closing lever 5 is pushed, the closing lever 5 rotates counterclockwise, and the roller 4a provided on the lever 4 integrated with the operation shaft 3 and the closing lever 4a. The restraint due to the engagement with the lever 5 is released, the operation shaft 3 is rotated counterclockwise to release the closing spring, and at the same time, the opening / closing shaft 6 is rotated clockwise through a connecting rod (not shown). Then, the circuit breaker 2 is momentarily turned on. However, at this time, since the blocking lever 8 maintains the state at the time of blocking shown in FIG. 2, the roller 7a of the opening / closing shaft 6 cannot engage with the blocking lever 8 and returns to the blocking state again.

Although not shown at this time, since the control circuit of the electric actuator for closing spring energization is in the open state, the energizing operation of the closing spring is not performed, so that the operating shaft 3 is moved counterclockwise. Both the closing spring for urging and the breaking spring for urging the opening / closing shaft 6 in the counterclockwise direction remain in the released state, so that the safety of the breaker 2 when it is pulled out of the panel is ensured.

When the breaker 2 is pulled out from the state shown in FIG.
Is disengaged from the engagement piece 15 from a position where it engages with the higher step surface of the engagement piece to a position where it engages with the lower step surface of the engagement piece, and the engagement rod 13 The compression spring 14 returns downward and returns to the original position. The compression spring 14 may be omitted if the engaging rod 13 can be lowered by its own weight.

Although the above embodiment is applied to the vacuum circuit breaker, it goes without saying that the present invention is not limited to this as long as it is of a spring closing type having an energy storage device.

Table 1 summarizes the movement of each component in the states of FIGS. 1 to 3 described above.

(Effects of the Invention) According to the present invention, the engagement rod mounted on the base is provided with an engagement rod that is freely movable in the vertical direction and is engaged when the circuit breaker is pulled out from the test position of the storage switchboard. This engaging rod engages with the one piece, and at the position where it engages with the lower step surface of the engaging piece,
It moves up and down to a position where it engages with the higher step surface of the engaging piece.

With the lever connected to this engaging rod, the breaking lever is first operated in the low lift position, and the closing lever is operated in the next higher lift position while maintaining that state. Even when the re-closing prevention interlock is working and the closing spring and the breaking spring are in the stored state, if the circuit breaker is pulled out to the outside of the switchboard, the engaging rod will engage with the engaging piece and Since the closing spring and the breaking spring are in a released state without requiring any operation, there is no damage to the releasing device due to an erroneous operation unlike the conventional example, and a highly reliable spring releasing device for a draw-out circuit breaker can be obtained. To be

[Brief description of drawings]

FIGS. 1 to 6 and 9 show an embodiment of the present invention, and FIG. 1 is a side view of a main portion showing a stored state in a test position of a drawer type circuit breaker in a switchboard 1. , FIG. 2 is a side view of a main part showing a state in which the engagement rod 13 engages with the engagement piece 15 and is pushed up to a low lift position and the circuit breaker 2 is shut off.
FIG. 4 is a side view of a main part showing a state in which the engagement bar 13 is engaged with the engagement piece 15 and pushed up to a high lift position to be in a released state, and FIG. a) is a plan view, (b) is a front view, FIG. 5 is a front view of the connecting plate 23, and FIG. 6 is the other lever 22b of the shutoff lever 22 and the connecting plate 2.
3 is a front view showing an engagement state with the third embodiment, FIG. 9 is an exploded perspective view showing a main part of the embodiment of the present invention, and FIGS. 7 and 8 are views showing a spring release device of a drawer type circuit breaker of a conventional example. FIG. 7 is a side view of the main part of the closing position of the closing spring in the test position, and FIG. 8 is a side view of the main part of the releasing device when the spring is pulled out from the test position. 1: Switchboard, 2: Draw-out circuit breaker (circuit breaker), 3: Operation axis, 5: Closing lever, 6: Opening / closing axis, 8: Breaking lever, 1
3: Engaging rod, 15: Engaging piece, 21: Closing operation lever, 2
2: shut-off operating lever, 23: connecting plate, 24: operating lever.

Claims (1)

[Claims] 1. A drawer type circuit breaker, which is accommodated in a closed type switchboard so as to be drawn out and is energized or interrupted by being biased by an energizing closing spring and a breaking spring, respectively, which is movable up and down with respect to the breaker. An engaging rod whose supported lower end contacts the base of the switchboard and moves together with the circuit breaker, and a contact rod with the engaging rod of the base of the switchboard that has passed the test position in the pull-out direction of the circuit breaker. An engaging piece having a two-step difference in the pull-out direction at a position, and when the engaging rod is pushed up to a position where it engages with a lower step surface of the engaging piece, the engaging piece operates in conjunction with the engaging rod. A shutoff lever that restrains the rotation of the opening / closing shaft that is rotated in the shutoff direction of the circuit breaker by the shutoff spring is driven in a direction to release the restraint of the open / close shaft; Push it to the position where it engages with the higher step surface. When the lever is raised, it interlocks with this engaging rod to drive the closing lever that locks the rotation of the operating shaft that is rotated in the closing direction of the circuit breaker by the closing spring in the direction to release the constraint of the operating shaft. A spring release device for a draw-out type circuit breaker, comprising: