JPS62113327A - Air blast circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an air breaker, more specifically, after accumulating pressure in an energy storage spring by operating a handle of the breaker, by giving a command, a current-carrying part is activated to release the energy storage spring. This relates to an air breaker that is closed and opened by force.

[Conventional technology]

As a conventional air breaker of this type, Japanese Patent No. 60-67528 shown in FIGS. 4 to 8 has been proposed. In the figure, (1) is an operating handle rotatably supported by a shaft (2), (3) is a first cam rotationally driven by the operating handle (1), and (4) is a first cam (3). ), (5) is an energy storage spring that accumulates pressure by the charge lever (4), and (6) is the contact opening/closing mechanism side where the energy storage spring force of the energy storage spring (5) is described later. This is a link mechanism that transmits information to the user, and is composed of a pair of links (6a), (6b), etc. (7) is a direction change lever that is rotatably supported by a pivot (7a), and its lower end is a link (
6a), and its upper end is connected to an insulating link (8) that constitutes a part of a contact opening/closing mechanism described later. (9a
)) (9b) is a pair of conductors forming part of the current-carrying part, (
10) is the main fixed contact fixed to the conductor (9a), (1
1) is a main movable contact that is brought into contact with and separated from a fixed contact (10), (12) is a mover to which a movable contact (11) is fixed;
3) is a movable element holder that holds the movable element (12), and an insulating link (8) is connected to the upper end thereof. (14) is a contact pressure spring that urges the movable element (12) in the contact closing direction. Configures the opening/closing mechanism. (15) is a closing latch that is rotatably supported on the pivot (16), and is rotated counterclockwise from the D-type latch (17) on the ON operation body side that releases the contact closed standby state. Ru.

(18) is a tripping latch, which includes a roll-side latch half (18A) having a locking roll (18a) and a locking portion (18b).
) and a locking side latch half (18B). Both latch halves (18A) and (18B) are rotatably mounted on a pivot (16). (19) is a push spring inserted between both latch halves (18A) and (IJ3B), one end of which is fitted into the protrusion (18c) of the roll side latch half (18A), and the other end of which is inserted into the locking side latch. half body (
18B) is fitted into the adjustment screw (20). (21)
is a nut that moves the adjusting screw (20) forward and backward, and the push spring (
19) Adjust the tension □ force. (22) is an arm portion provided integrally with the roll-side latch half (18A), which restricts the spread of the locking-side latch half (18B).

(23) is a second cam that is rotatably supported on the shaft (24) and biased counterclockwise by a return spring (25), and is connected to the locking roll (18a) of the tripping latch (18). It has a recessed part (23a) to engage and has a tripping latch (1).
The roll-side latch half (18A) of 8) resists the pushing spring force and applies a clockwise pushing force. (26) is the bin (2) of the second cam (23).
3b) and the pin (6C) of the link mechanism (6), the tension link (27) is connected to the tripping latch (1
8) and engages with the locking part (18b) of the tripping latch (18).
) is used to prevent the locking side latch half (18B) from rotating clockwise.
With the cam (23) of Configure standby mode. The D-type switch (27) is rotated clockwise by an OFF mechanism (not shown) that releases the contact open standby state.

Next, the operation will be explained. In Fig. 4, in the fifth position, the direction change lever (7) is biased two rotations counterclockwise by the tension force of the contact spring (14), and the link mechanism (6) is rotated counterclockwise.
The part C) receives a pressing force trying to bend in the direction of the arrow (28), but the second cam (23) does not release the tripping latch (
18) Since it is blocked and does not rotate clockwise, it is maintained in the state shown. In this state, the push spring (19) does not contract against the tension force of the contact spring (14), so both latch halves (18A) and (18B) do not displace each other, and the tripping latch (18) does not deform. . [No effect during normal opening/closing of the breaker.]

As shown in Fig. 6, when the D-type latch (27) is rotated clockwise by operation using the OFF operating body, the tripping latch (18) is slightly rotated clockwise against the spring force of the push spring (19). As a result, the concave portion (23a) is removed from the retaining roll (18a) as shown in FIG. 7, and the second cam (23) is moved by the contact pressure spring (14) by the arrow (2) in FIG.
It rotates clockwise due to the acting force of 8). Therefore, the tensioning action of the link (26) is lost, and the link mechanism (6)
Even the hips collapse into a state of flexion.

This opens both contacts (10) and I (11) as shown in FIG. Note that explanations of the energy storage operation and ON operation of the energy storage spring (5) will be omitted here.

In this air breaker, the opening latch (27) on the OFF operating body side is manually rotated clockwise, or abnormal current flowing through the breaker is detected using a current transformer (not shown) or the like. The opening latch (27) is automatically rotated clockwise by energizing an electromagnetic coil (not shown) according to the anti-time characteristic by the electric control unit of the trip relay (not shown). immediately cut off the abnormal current in the circuit.

Further, when the contacts shown in FIGS. 4 and 5 are closed, if a current exceeding the specified value passes through both contacts (10).

A contact repulsion force expressed by the following equation is generated at the contact point (11).

Contact repulsive force = oge-4π a to L8 This contact repulsive force acts on the tensioning link (26) via the direction change lever (7) and link Q side (6), and then acts on the contact pressure spring (14). ) along with the extension force of the second cam (2
3) Apply clockwise rotational force to This rotational force is transferred to the roll side latch half (18A) via the locking roll (18a).
If the tension force exceeds the tension force of the push spring (19), the roll side latch half (
18A) and push up both latch halves (18A).

(18B) are displaced from each other, so the locking rolls (18a
) comes off from the recessed part (23a) of the second cam (23),
The second cam (23) is rotated clockwise as it is, and the contacts (10)j (11) in FIG. 8 are in the open state. In other words, the opening type latch (27) on the OFF operation body side
) can open the contacts without waiting for automatic rotation.

In this case, the shutoff time is shortened and high-speed shutoff can be performed.

[Problems to be solved by the invention] In the conventional air breaker as described above, the push spring (19
), even if the electromagnetic repulsive force acting on the current-carrying member is small, both latch halves (18A) and (18B) will be displaced inwardly against each other against the pressure spring (19) and locked. The roll (18a) is removed from the recess (23a) of the second cam (23), and the second cam (23) is rotated to connect the contact (10).
Since j (11) is opened, even higher-speed disconnection is possible, but if the push spring (19) is weakened, the reaction force of the collision force between both contacts (10) and (11) that occurs at the moment the contacts close will cause Both latch halves (18A) and (18B) are displaced inward against the push spring (19) and the locking roll (
18a) is removed from the recess (23a) of the second cam (23), the second cam (23) is rotated, and the contacts (10),
There was a problem that (11) opened and mistripped.

This invention was made to solve this problem, and both contacts (10)j (1
It is an object of the present invention to provide an air breaker which enables the use of a weak push spring (19) by preventing mistrips due to the reaction force of the collision force in 1), and which can further perform high-speed breaking.

[Means for solving problems]

The air breaker according to the present invention is supported with the pivots of both latch halves as the center of rotation, and is actuated by a link mechanism before the contact closes to make a pendulum movement, and this pendulum movement causes the roll side latch to move. It includes a pendulum that temporarily pushes the half body in the direction of engagement with the second cam.

[For production]

In this invention, the pendulum is actuated by the link mechanism before the contact closes to press the roll-side latch half in the direction of engagement with the second cam, and at the same time, the Since the roll-side latch half is separated from the second cam by the reaction force of the contact force, the pendulum just prevents the roll-side latch half from separating.

[Embodiments of the invention]

Figures 1 to 3 show an embodiment of the present invention, and (29) is a pendulum rotatably inserted into the pivot (16), which abuts the link mechanism (6) before the contact closes. protrusion(
29a) and a push rod (29b) for pressing the roll side latch half (18A). (30) is a stopper for setting the stopping position of the pendulum (29), (
31) is a return spring that lightly presses the pendulum (29) against the stopper (30).

The rest of the configuration is the same as the conventional device described above, so a description thereof will be omitted.

If the pendulum (29) is provided in this way, when the contact is opened, it will be at the position (a) shown by the dashed line in FIG.
The pendulum (29), which has been stopped by the spring (31) and returned to the state shown in Figures 1 and 3, is moved by the arrow (32
), and from position (b) shown by the solid line in Figure 1, it further rotates due to inertia and reaches position (C), where the push rod (2
9b) to press the arm portion (22) of the roll side latch half (18A). Almost simultaneously with this, both contacts (10) occur at the instant of contact closure.

The tension link (26) is created by the reaction force of the collision force of (11).
The second cam (23) is rotated via the cam and the stop roll (18a) of the roll-side latch half (18A) is pushed up, but the lock roll (18a) is pressed by the pendulum (29). Therefore, the recessed part (23) of the second cam (23)
I can't deviate from a). When the contact is closed, the first
As shown by the solid line in the figure, the pendulum (29) is in position (b) and separates from the arm part (22), so the roll side latch half (18A) is free, and the tripping latch ( 18). At this time, as mentioned above, the error is due to the reaction force of both contacts that occurs at the moment the contacts close)
Since there is no need to worry about IJ bumps, the push spring (19) can be weakened to achieve even higher speed shutoff.

〔Effect of the invention〕

As explained above, this invention enables the use of a weak push spring by preventing mistrips due to the reaction force of the collision force between both contacts that occurs at the instant of contact closing, and has the advantage of enabling high-speed disconnection. There is.

[Brief explanation of drawings]

Fig. 1 is a mechanical diagram of the main parts showing an embodiment of the present invention, Fig. 2 is a partially enlarged view of the contact in the open state, Fig. 3 is a view of Fig. 2 seen from the left, and Fig. 4 is a diagram of the conventional device. Mechanism diagram, Figure 5 is the 4th
Figure 6 is a diagram when the contact is open, Figure 7 is a partially enlarged view of the moment the contact open standby state in Figure 5 is released, Figure 8 is an exploded view of Figure 7. It is a diagram. In the figure, (1) is the operating handle, (3) is the first cam, (4) is the charge lever, (5) is the energy storage spring, and (6) is the charge lever.
) Hall link mechanism, (7) is a direction change lever, (10) is a fixed contact, (11) is a movable contact, (12) is a mover, (
14) is the contact pressure spring, (16) is the pivot, (18) is the tripping latch, (18A) is the roll side latch half, (18B)
is the locking side latch green wood (18a) is the locking roll, (18b
) is the locking part, (19) is the push spring, (23) is the second cam, (23a) is the recessed part, (26) is the tension sink, (27) is the D on the OFF 4fi construction side. Shape, (2
9) is a pendulum, (30) is a stopper, and (31) is a return spring. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Patent Attorney Masuo Oiwa Figure 2 Figure 2! b Figure 4 5th edition 9! jlLI/2

Claims (2)

[Claims] (1) A first cam that is rotationally driven by the handle operation of the shield disconnector, a charge lever that is in rolling contact with the first cam and rotationally displaced, and an energy storage spring that accumulates pressure by the charge lever; A link mechanism that transmits the stored pressure spring force of this storage spring to the contact opening/closing mechanism side, and an electromagnetic repulsive force acting on the current-carrying member due to the spring force of the contact pressure spring in the contact opening/closing mechanism and the passage of a current exceeding a specified value when the contact is closed. a contact open standby maintenance mechanism that prevents the link mechanism from driving the contact opening/closing mechanism to open due to the acting force of the contact open standby maintenance mechanism; and an OFF operation that opens the contact by canceling the contact open standby maintenance state by the contact open standby maintenance mechanism. a second cam connected to the link mechanism as the contact open standby maintenance mechanism; a locking roll that engages with the second cam; and the OFF switch.
A pneumatic switch or disconnector is provided with a tripping latch having a locking portion that engages with the operating body side, and the tripping latch is connected to a roll-side latch half having the locking roll and the locking portion. and a locking side latch half body having a section, and both latch halves are pivotally connected on the same axis, and a pressing spring is provided between the two latch halves so that they repel each other within a predetermined angular range. is inserted, the latch halves are supported with the pivots of the two latch halves as the center of rotation, and are actuated by the link mechanism before the contact closes to make a pendulum movement, and this pendulum movement causes the roll side A pendulum is provided that temporarily presses the latch half in the direction of engagement with the second cam, and the reaction force of the collision force between the two contacts generated at the moment the contacts close due to the pendulum movement of the pendulum before the contacts close. 2. A dipping and disconnecting device, characterized in that the roll-side latch half is temporarily prevented from detaching from the second cam. (2) The pneumatic plunger and disconnector according to claim 1, further comprising a stopper for setting the stop position of the pendulum, and a return spring for lightly pressing the pendulum on the stopper.