JP2015162402A - Circuit breaker operation mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten an opening time in a circuit breaker operation mechanism.SOLUTION: The circuit breaker operation mechanism includes: a main contact which opens/closes a power circuit by contacting/separating a movable-side main contact and a fixed-side main contact to/from each other; an open link of which the central part is pivoted in a freely rotatable manner and with which the movable-side main contact is provided in one end; an open spring which is provided in the other end of the open link and transmits an energizing force in a direction where the open link is rotated in a separating direction of the movable-side main contact; and a closing drive mechanism which is connected to the open link and drives the open link in a closing direction to close the main contact. During a main contact opening operation, the open link and the closing drive mechanism are disconnected.

Description

  The present invention relates to a switch operating mechanism that cuts off a current in a short time, particularly in a switch that opens and closes a DC power circuit. "Switch" is a general term for both a circuit breaker (with a breaker capability) and a switch (normal switch with no breaker capability).

  DC high-speed circuit breakers used in DC electric railway substations, etc. open the main contact until the short-circuit current of the circuit reaches the final value, and perform current-limiting interruption until the current reaches the final value of the fault current. There is a demand to perform, and the opening time is shorter than that of a general circuit breaker. For this reason, in order to cope with an increase in the rush rate, it is necessary to shorten the opening time, and it is necessary to devise such as further increasing the spring energy. As one solution to this, a switch operating mechanism as in Patent Document 1 has been proposed.

JP 2009-170318 A

  In the conventional DC circuit breaker, as shown in FIG. 6, the contact pressure spring 67 and the opening spring 66 are arranged on the same system link that drives together. The load of the contact pressure spring 67 acts on the side that closes the main contact 2, and the load of the opening spring 66 acts on the side that opens the main contact 2. When the opening latch 65 is released to release the energy of the opening spring 66 and the contact pressure spring 67 to open the main contact 2, the energy of the contact pressure spring 67 cancels the energy of the opening spring 66 for the above reason. There was a timing to work in the matching direction, and the opening of the main contact 2 was delayed. For this reason, as disclosed in Patent Document 1, a mechanism is proposed in which a closing spring portion having a closing spring and an opening / closing drive unit connected to a vacuum valve are separated in an open state and a closed state. An object of the present invention is to obtain a faster opening time than the switch operating mechanism of Patent Document 1.

  The switch operating mechanism according to the present invention is a main contact for opening and closing a power circuit by moving a movable side main contact and a fixed side main contact from each other. An opening link provided with a contact, an opening spring that is provided at the other end of the opening link and transmits an urging force in a direction to rotate the opening link in the opening direction of the movable main contact; and the opening A closing drive mechanism that is connected to a pole link and drives the opening link in a closing direction to close the main contact, and when the main contact opens, the opening link and the closing drive The connection with the mechanism is disconnected.

  According to the switch operating mechanism of the present invention, by disconnecting the connection between the opening link and the closing drive mechanism, it is possible to open in a short time without being affected by the spring energy of the contact pressure spring on the contact pressure link side. The pole becomes possible. Further, it is possible to reset to a state where the next closing operation is possible by the releasing operation of the closing spring.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view for demonstrating the structure of the switch operating mechanism in Embodiment 1 of this invention, (a) is a side view, (b) is a top view. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view illustrating a structure of a switch operating mechanism according to Embodiment 1 of the present invention and illustrating an open state of the switch. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view illustrating a structure of a switch operating mechanism according to a first embodiment of the present invention and showing a closed state of the switch. It is a sectional side view which shows the state before opening operation of the switch operating mechanism in Embodiment 1 of this invention, and reset operation. It is a perspective view which shows the opening drive mechanism part for demonstrating the structure of the switch operating mechanism in Embodiment 2 of this invention. It is structural drawing which shows the conventional switch operating mechanism.

The feature of the present invention is that the structure of the integrated operation mechanism is separated into a closing drive mechanism and an opening drive mechanism. First, an outline of the present invention will be described.
When the operation lever is operated, the contact pressure link connected to the contact pressure spring via the latch cam rotates, and the opening latch provided on the contact pressure link is slid. At this time, the main contact is turned on by pulling the latch pin provided on the opening link by the opening latch. When the main contact is opened, the opening latch is released, and the engagement between the opening drive mechanism and the closing drive mechanism is released, so that it is not affected by the contact pressure spring on the contact pressure link side. Open the pole.
Further, at the end of the opening process, the closing holding mechanism of the closing drive mechanism is released and reset to a state where the next closing operation is possible.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.

Embodiment 1 FIG.
1 to 4 show a switch operating mechanism according to Embodiment 1 of the present invention. 1 and 2 show the overall structure of the switch operating mechanism, FIG. 3 shows the input state of the switch operating mechanism, and FIG. 4 shows the open state of the switch operating mechanism.

  In FIGS. 1 and 2, the switch operating mechanism includes a closing drive mechanism, an opening drive mechanism, and a contact pressure holding latch releasing mechanism, and the structure of each mechanism will be described in sequence with an explanation of the operation. explain.

First, the closing drive mechanism will be described.
The closing drive mechanism includes an operation lever 11, a latch cam 12, a contact pressure holding latch 13, a contact pressure spring rod 15 having a contact pressure spring 14, a contact pressure link 21, an opening latch 23 having a coil pressing plate 22, and an opening latch. It is comprised by members, such as the pressing board 24, and these members are equipped in the frame F1 as follows.

The operation lever 11 opens the main contact 30 (the movable main contact 30a and the fixed main contact 30b), and a substantially triangular latch cam 12 is integrally formed at the non-operation end of the operation lever 11. The latch cam 12 is pivotally supported on the frame F1 by a fixing pin S1.
The operating end of the operating lever 11 is connected to the driving device 50 via a connecting rod 51. When the driving device 50 pushes and pulls the connecting rod 51, the operating lever 11 is fixed to the fixing pin S1. It is rotated clockwise or counterclockwise as the rotation center. The drive device 50 linearly drives the central axis connected to the connecting rod 51 in the axial direction, such as a spring operation mechanism or an electromagnetic operation mechanism. However, the operation of the central axis is not limited to linear motion, and may be circular motion.
The bottom portion 12a, which is the free end side of the latch cam 12, is guided and slid by the half-moon-shaped engagement portion (diameter portion) of the contact pressure holding latch 13 provided in the frame body F1 when rotating by the operation lever. Are formed in an arc shape. Further, a cutout portion 12b is provided at one end of the arc-shaped bottom portion 12a. The notch 12b engages with the arcuate surface of the half-moon engaging portion of the contact pressure holding latch 13 to stop the rotation of the latch cam 12 and perform the closing operation of the main contact 30 of the operation lever 11. Terminate. In addition, a connecting movable pin P1 for connecting the contact pressure spring rod 15 is provided at the other end of the arcuate base 12a.

One end portion of the contact pressure spring rod 15 has a longitudinal long hole 15a for sliding the connecting movable pin P1, and this one end portion is connected to the latch cam 12 by the connecting movable pin P1 as described above. ing.
The other end portion of the contact pressure spring rod 15 is connected to one end portion of the contact pressure link 21 so as to be rotatable and refractable by a connecting movable pin P2.
The center of the contact pressure link 21 connected to the contact pressure spring rod 15 is pivotally supported on the frame F2 by a fixing pin S2.

  The contact pressure spring 14 is wound around the contact pressure spring rod 15 and is stretched between the other end of the contact pressure spring rod 15 and the connecting movable pin P1 of the latch cam 12, and during the closing operation by the operation lever 11, As will be described later, the accumulating force is accumulated with the movement of the contact pressure spring rod 15, and the main contact 30 is urged in the contact pressure direction. The accumulating force of the contact pressure spring 14 is such that the contact pressure holding latch 13 is engaged with the notch 12b of the latch cam 12 to keep the latch cam 12 locked, and the closing state of the closing drive mechanism is maintained. Specifically, it contributes to resetting the operation lever 11.

The opening latch 23 is pivotally supported by the connecting movable pin P3 at the other end portion of the contact pressure link 21, and the hook portion is engaged with and disengaged from the latch pin P5 as described later.
The hook portion of the opening latch 23 is urged in the direction of the latch pin P5 by the opening latch holding plate 24 that rotates about the fixing pin S4, and the engagement with the latch pin P5 is performed by operating the coil pressing plate 22. Canceled.

Next, the opening drive mechanism will be described.
The opening drive mechanism includes members such as an opening link 25 (opening link main body 25a, main contact blade 25b), an opening spring rod 42, an opening spring 41, an opening stopper 43, and the like. The frame body F2 is equipped as follows.

The opening link 25 is integrally formed by a main contact blade 25b equipped with a movable main contact 30a at an end and an opening link main body portion 25a. It is pivotally supported on the frame F2 by a fixing pin S3. The fixed-side main contact 30b is disposed at a position facing the movable-side main contact 30a, and opens and closes the main circuit of the switch by contacting and separating from the movable-side main contact 30a by rotating the opening link 25. Do.
The opening link main body 25a of the opening link 25 is provided with a latch pin P5 that engages with the opening latch 23. As will be described later, the opening and closing mechanism is opened and closed by the engagement and disengagement between the opening latch 23 and the latch pin P5. Linkage with the pole drive mechanism or release of the linkage is performed.
The opening link main body 25a of the opening link 25 is provided with a latch pin P5 that engages with the opening latch 23. As will be described later, the opening and closing mechanism is opened and closed by the engagement and disengagement between the opening latch 23 and the latch pin P5. Linkage with the pole drive mechanism or release of the linkage is performed.

One end portion (opening latch side end portion) of the opening spring rod 42 is pivotally supported by the opening link main body portion 25a by a movable pin P4. The other end portion is provided with a long hole 42a, and is supported by the long hole 42a and a fixing pin 42P provided in the frame body F2 so as to be movable in the longitudinal direction.
The open spring 41 is wound around the open spring rod 42 and is stretched between one end of the open spring rod 42 and the fixed pin 42P. When the open lever spring 42 is closed, The spring pressure in the opening direction is fed with the movement. Reference numeral 43 denotes an opening stopper that restricts the movement of the opening spring rod 42.

The closing operation by the movable side main contact 30a and the fixed side main contact 30b will be described with reference to FIGS.
In FIG. 2, when the operating lever 11 in the open state is pulled downward by the driving device 50 as shown in FIG. 3, each pin-connected component rotates and moves linearly.

That is, the latch cam 12 rotates clockwise around the fixed pin S1, the connecting movable pin P1 moves in the long hole 15a, and stops above the long hole 15a (FIG. 3). Further, in the process in which the latch cam 12 continues to rotate, the power is transmitted in the order of the contact pressure spring rod 15 -contact pressure link 21 -opening latch 23 -latch pin P5. At this time, the contact pressure link 21 rotates counterclockwise about the fixed pin S2, and the opening link 25 also rotates counterclockwise about the fixed pin S3 via the opening latch 23. The side main contact 30a moves to the input side, closes with the fixed side main contact 30b, and closes. Then, when the notch 12b is locked by the contact pressure holding latch 13, the closing ends, and the force applied to the operation lever 11 is released, so that the closing state of the closing drive mechanism is maintained.

During the main contact closing operation, the spring energy of the contact pressure spring 14 and the opening spring 41 is stored. That is, the contact pressure spring 14 is compressed and stored by the movement of the connecting movable pin P1, and after contact with the main contact 30 (movable side main contact 30a and fixed side main contact 30b) is closed, the contact pressure spring 14 is kept in contact for a while. Compressed for a while. Further, the accumulated contact pressure spring energy is held by the engagement between the contact pressure holding latch 13 and the notch 12 b of the latch cam 12.
On the other hand, the opening spring 41 is also compressed by the movement of the opening spring rod 42 in the right direction (FIG. 3) and stored in preparation for the opening operation.
The above series of operations is performed during the downward operation of the operation lever 11.

The opening operation will be described with reference to FIG.
In the closing state of FIG. 3, the coil pressing plate 22 is operated to rotate the opening latch 23 clockwise. By this operation, the hook portion of the opening latch 23 with respect to the latch pin P5 is disengaged, and the opening link 25 receives the released energy of the opening spring 41 and rotates clockwise around the fixed pin S3 to be movable. The side main contact 30a is moved to the right in FIG. 4 to be separated from the fixed side main contact 30b to open the main circuit of this switch.
After the engagement of the opening latch 23 and the latch pin P5 is released, in the closing drive mechanism, the contact pressure link 21 is fixed in the counterclockwise direction around the fixed pin S2 by the spring pressure of the contact pressure spring 14. Rotate slightly until contacted. After the contact with the fixing pin S4, the state where the contact pressure spring 14 is stored by the engagement between the contact pressure holding latch 13 and the latch cam 12 is maintained. That is, the opening is performed by the released energy of the opening spring 41 without being influenced by the spring pressure of the contact pressure spring 14.
This opening operation is instantaneous, and the next automatic reset operation is performed in conjunction with this operation.

First, based on FIG. 1, the structure of the contact pressure holding latch release mechanism for performing the automatic reset operation will be described.
As shown in FIG. 1, the contact pressure holding latch release mechanism includes a contact pressure holding latch release link 31.
This contact pressure holding latch release link 31 is disposed between the latch pin P5 located at the opening latch side end of the opening link 25 and the contact pressure holding latch 13, and forms a crank mechanism that links the both. . That is, the contact pressure holding latch release link 31 has a latch pin side link 31a and a contact pressure holding latch side link 31b on both sides, and the contact pressure holding latch side link 31b has an axial end portion of the contact pressure holding latch 13. Is inserted into an integrated structure.

Next, the automatic reset operation will be described.
At the end of the opening process, one of the latch pin side links 31a is kicked up by the latch pin P5 and rotates clockwise. At that time, the other contact pressure holding latch side link 31b is counteracted by the link mechanism. Rotate clockwise.
Due to the counterclockwise rotation of the contact pressure holding latch side link 31b, the contact pressure holding latch 13 directly connected to the contact pressure holding latch side link 31b co-operates. The engagement between the arcuate surface and the notch 12b of the latch cam 12 is released (the main contact closing and holding state of the closing drive mechanism is released). Then, the arcuate bottom portion 12a of the latch cam 12 begins to slide on the diameter portion of the half-moon engaging portion of the contact pressure holding latch 13, and the closing drive mechanism is automatically reset by the released energy of the contact pressure spring 14. That is, the operation lever 11 returns to the initial state (returns), so that the next closing operation is possible.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to FIG.
In the first embodiment, the latch pin P5 is pulled by the opening latch 23. However, in the second embodiment, the opening link main body 25a integrated with the main contact blade 25b is formed by the hook-shaped opening latch 23. It is configured to be pulled in directly.
By directly pulling in the opening link main body 25a with the hook-shaped opening latch 23 in this way, the same effect as in the case of pulling in with the opening latch 23 of the first embodiment can be obtained without the latch pin P5 in the first embodiment. Can be obtained.
In the second embodiment, since the latch pin P5 is eliminated, for example, the opening link main body 25a is bent or the latch pin side link 31a itself is bent.

In the description of the operation of the first embodiment, the length of the connecting rod 51 is different in the drawings in FIGS. 2 to 4, but in this figure, the driving device 50 simply pushes and pulls the operation lever 11. However, it does not show that the connecting rod 51 actually expands and contracts.
In the first embodiment, an example in which the operating lever 11 is operated by the driving device 50 has been described. However, a switch that operates the operating lever 11 manually without using the driving device 50. It may be.
In the present invention, each embodiment can be appropriately modified or omitted within the scope of the invention.

11: Operation lever, 12: Latch cam, 12a: Arc-shaped bottom,
12b: Notch, 13: Contact pressure holding latch, 14: Contact pressure spring,
15: Contact pressure spring rod, 15a: Long hole, 21: Contact pressure link,
22: Coil pressing plate, 23: Opening latch, 24: Opening latch holding plate,
25: Opening link, 25a: Opening link body, 25b: Main contact blade,
30: Main contact, 30a: Movable main contact, 30b: Fixed main contact,
31: Contact pressure holding latch release link, 31a: Latch pin side link,
31b: Contact pressure holding latch side link, 41: Opening spring,
42: Opening spring rod, 42a: Long hole, 42P: Fixing pin,
43: Opening stopper, 50: Drive device, 51: Connecting rod,
S1: fixed pin, S2: fixed pin,
S3: fixed pin, S4: fixed pin, P1: movable pin for connection,
P2: movable pin for connection, P3: movable pin for connection, P4: movable pin,
P5: Latch pin, F1: Frame body, F2: Frame body.

Claims (6)

A main contact that opens and closes the power circuit by moving the movable main contact and fixed main contact
An opening link in which a central portion is pivotally supported and the movable side main contact is provided at one end,
An opening spring provided at the other end of the opening link and transmitting the urging force in a direction to rotate the opening link in the opening direction of the movable main contact, and the opening link connected to the opening link. A closing drive mechanism for closing the main contact by driving the link in a closing direction, and disconnecting the opening link from the closing drive mechanism during the opening operation of the main contact. Switch operating device. The closing drive mechanism has a contact pressure link in which a central portion is pivotally supported and a contact pressure spring rod is connected to one end;
A driving device that transmits a driving force to the contact pressure link via the contact pressure spring rod in a direction to rotate the movable main contact in the closing direction, and when the contact pressure link is rotated by the drive device, the contact A contact pressure spring that transmits a biasing force in the closing direction of the movable side main contact to the contact pressure link via a pressure spring rod;
An opening latch is provided between the other end of the opening link and the other end of the contact pressure link so as to be able to be engaged and disengaged to disconnect the opening link from the closing drive mechanism when the main contact is opened. The switch operating mechanism according to claim 1.   The opening link, an opening spring rod provided on the opening latch side end of the opening link, and a spring pressure in the opening direction when the opening is closed by the driving device provided on the opening spring rod. An opening driving mechanism configured by an opening spring to be biased, and the closing driving mechanism, and the main contact closing state is maintained by a closing operation by the driving device, and the opening latch with respect to the opening link The main contact is opened without being affected by the spring pressure of the contact pressure spring by releasing the engagement of the closed contact mechanism and the opening drive mechanism. The switch operating mechanism according to 2.   Between the opening latch side end of the opening link and the closing drive mechanism, a closing drive mechanism release link that links both is provided, and the closing drive mechanism release link is connected to the opening link with respect to the opening link. Interlocking with the operation of disengaging the opening latch, releasing the main contact closing holding state of the closing drive mechanism by this interlocking operation, and returning the driving device to a state where the main contact can be input next time. The switch operating mechanism according to claim 3. One end of the contact pressure spring rod is pivotally supported by one end of the contact pressure link and the other end of the contact pressure spring rod is movable in the longitudinal direction. , Pivotally supported by the opening latch side end and the other end is pivotally supported in a longitudinally movable state,
5. The contact spring according to claim 3 or 4, wherein the contact pressure spring is fed with the movement of the contact pressure spring rod and the opening spring is fed with the movement of the opening spring rod. The switch operating mechanism described.   The switch according to any one of claims 2 to 5, wherein the opening latch is formed by a hook mechanism that is detachable with respect to an opening latch side end portion of the opening link. Operation mechanism.