JPH0110828Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an air switch having a structure that suppresses electromagnetic repulsion caused by a large current when the switch is closed.

In general air switches, there is a problem in which the movable contact detaches from the fixed contact due to electromagnetic repulsion generated by large current (short-time current) once the switch is closed. In order to ensure that the switch is maintained in the closed state by the electric current, conventional structures have taken measures such as making the contact parts sturdy or using a large-sized switch.

The present invention was devised in view of such conventional problems, and the purpose is to provide an air switch that can suppress electromagnetic repulsion caused by large current without changing the size of the switch. shall be.

To achieve this purpose, the pneumatic switch of the present invention has a rotating shaft that is rotated by an opening/closing lever provided outside the switch box, and an actuator that is fixed to the rotating shaft and rotates integrally with the rotating shaft. An operating pin protruding from the tip of the plate, rotatably attached to the rotating shaft, biased by a spring in the rotational direction when the rotating shaft is turned on, and biased by the spring by the operating pin. a stopper plate whose rotation in the direction is restricted; an actuation link with which the actuation pin engages and is provided with a long hole having a length shorter than the movement stroke of the actuation pin; and a stopper plate that rotates in conjunction with the actuation link; and a link mechanism that converts the rotational movement of the operating shaft into an opening/closing operation movement of a movable contact, and a part of the link mechanism has a tip end face of the stopper plate when the movable contact is in the closed state. Locking portions are provided that are closely opposed and lock the opening, and are approximately perpendicular to the line of action of the force acting on the locking portion of the link mechanism when the movable contact in the closed state receives a force in the opening direction. The stopper plate is characterized in that the front end surface of the stopper plate is formed so that the center of the rotation shaft is located substantially on an extension of the line of action.

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

FIG. 1 is a cross-sectional view of the switch in an open state, showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the switch in a closed state.

In these figures, 1 is a switch box body,
Inside thereof, a fixed contact 15 and a support rod 4 are installed via a fixed contact support insulator 2 and a movable contact support insulator 3. A proximal end portion of a movable contact 5 that contacts the fixed contact 15 is pivotally attached to the support rod 4 .

An opening/closing lever 6 for manual opening/closing operation is provided on the outside of the switch box 1, and its rotation shaft 7
is inserted into the interior of the switch box 1. An operating plate 8 that rotates together with the rotating shaft 7 is fixed to the rotating shaft 7, and an operating pin 9 is attached to the tip of the operating plate 8.
is installed protrudingly. Reference numeral 10 denotes an operating link having a long hole 10a at one end that engages with the operating pin 9, and the other end is pivotally connected to the distal end of an operating lever 11 whose base end is fixed to an operating shaft 12. There is.
A driving lever 13 is fixed at its base end to the operating shaft 12, and the base end of a connecting link 14 connected to the middle part of the movable contact 5 is attached to the distal end of the driving lever 13 by a locking pin 18. It is pivoted.

16 is rotatably mounted on the rotating shaft 7, and biased by a spring 17 in the clockwise direction in the drawing, that is, in the rotational direction when the rotating shaft 7 is turned on,
It is also a stopper plate whose rotation in the clockwise direction by the operating pin 9, that is, in the biasing direction by the spring 17, is restricted. The locking pin 1
8 serves to connect the drive lever 13 and the connection link 14 and to be locked by the tip of the stopper plate 16 when the switch is closed. 1
Reference numerals 9 and 20 indicate stoppers that limit the rotation of the opening/closing lever 6 when the opening/closing lever 6 is in the open position or the closed position.

In the above, when the switch is in the closed state shown in FIG.
When the switch attempts to rotate around the operating shaft 12 in the opening direction of the switch, that is, in the counterclockwise direction, the locking pin 18 comes into contact with the end surface of the stopper plate at a substantially right angle, and at the time of this contact, the locking pin 18 The relative positions are set so that the line of action of the force acting on the stopper plate 16 passes through the center of rotation of the stopper plate 16, that is, at or near the center of rotation of the rotating shaft 7.

The angle of contact between the locking pin 18 and the stopper plate 16 is preferably a right angle; There is no problem in practice even if the angle with the line of action is set to be a slightly obtuse angle. In this case, even if some clockwise rotational force is applied to the stopper plate 16, the rotational force is received by the handle mechanism via the operating pin 9. Since this handle mechanism does not move unless an extremely large operating force is applied, the stopper plate 16 will not come off due to the rotational force. Also,
Even if the above-mentioned angle is an obtuse angle, if there is a slight deviation from the approximately right angle, the rotational force (counterclockwise) acting on the stopper plate 16 is small, and resistance due to friction etc. during transmission of each mechanism acts. , the stopper plate 16 will not come off.

Now, when the rotating shaft 7 is rotated clockwise by operating the external opening/closing lever 6 from the switch open position shown in FIG. Operating pin 9 protruding from plate 8
moves within the elongated hole 10a of the actuation link 10 by a stroke corresponding to that length, but the actuation pin 9 moves within the elongated hole 10a of the actuation link 10.
When reaching the tip 0a, the operating link 10 receives a leftward movement force and rotates the operating shaft 12 clockwise. Therefore, the movable contactor 5 is driven in the closing direction by the drive lever 13 and the connecting link 14.

In the process of inserting the movable contact 5, the stopper plate 16 rotates in conjunction with the rotation of the rotating shaft 7.
Due to the play caused by the elongated hole 10a, the operating shaft 12 rotates with a delay. Therefore, when the stopper plate 16 rotates quickly, the locking pin 18 that rotates later is attached to the side edge of the stopper plate 16.
The locking pin 18 rotates while being pushed counterclockwise relative to the rotating shaft 7 against the elasticity of the spring 17.

Immediately before the movable contactor 5 is completely inserted, the locking pin 18 passes the tip corner of the stopper plate 16, and the locking pin 18 reaches the set position, while the stopper plate 16 is pressed by the locking pin 18. is released, and the restoring force of the spring 17 restores it to the position where clockwise rotation is restricted by the operating pin 9, as shown in FIG.

In this closing state, the locking pin 18 is close to and facing the tip of the stopper plate 16, and as described above, the locking pin 18 at the tip of the operating shaft 12 rotates around the operating shaft 12 in the opening direction of the switch. That is, when the locking pin 18 attempts to rotate counterclockwise, the locking pin 18 contacts the end surface of the stopper plate 16 at a substantially right angle, and the line of action of the force exerted by the locking pin 18 on the stopper plate 16 at the time of this contact is The relative position is set so as to pass through the center of rotation of the stopper plate 16, that is, the center of rotation of the rotating shaft 7, or the vicinity thereof. Locking pin 18
is locked to the stopper plate 16 in this way, so when a force is applied to drive the movable contact 5 in the opening direction with the opening/closing lever 6 in the closed state,
The force is transmitted to the drive lever 13 via the connecting link 14.
The user attempts to rotate the locking pin 18 counterclockwise around the operating shaft 12, but at that time, the locking pin 18 comes into contact with the end surface of the stopper plate 16, and the movable contact 5 cannot be rotated. .

Therefore, when a large current flows through the movable contact 5 and the fixed contact 15 due to an accident or the like when the switch is in the closed state, a force that attempts to open the movable contact 5 acts due to the electromagnetic repulsion generated at that time. too,
The acting force is applied to the rotating shaft 7 via the stopper plate 16.
and is restrained by the operating pin 9, and finally completely restrained by the stopper 20 of the opening/closing lever 6.

When opening from the closing position, if the opening/closing lever 6 is operated counterclockwise, the rotating shaft 7 will also rotate, and the stopper plate 16 will be rotated counterclockwise via the operating plate 8 and operating pin 9. This means that the locking pin 18 is released from the locking position. At the same time, when the actuating pin 9 moves within the elongated hole 10a and moves by more than the stroke, a moving force is applied to the actuating link 10, rotating the operating shaft 12 and moving the movable contact 5 to the open position (the position shown in FIG. 1). ) can be driven.

Note that the long hole 10a provided in the operating link 10 is
When opening, first rotate the stopper plate 16,
By adjusting the timing so that the drive lever 13 and the locking pin 18 start the opening operation after being released from the locking position, and by reducing the initial operation force of the opening/closing lever 6 at the time of closing and opening, and reducing its inertia. It is designed to allow for instantaneous closing and opening.

As described above, according to the present invention, the tip of the stopper plate is arranged so as to be substantially perpendicular to the line of action of the force acting on the locking portion of the link mechanism when the movable contact receives a force in the opening direction. Since the movable contact is configured to form a plane and the center of rotation of the stopper plate is located approximately on the extension of the line of action, the movable contact will not open even if an electromagnetic repulsion force due to a large current acts in the closed state. There is no. Therefore, short-time current characteristics can be ensured without increasing the size of the switch.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention in a switch open state, and FIG. 2 is a sectional view showing the switch in a closed state. 1: Switch box body, 2: Fixed contact support insulator,
3: Movable contact support insulator, 4: Support rod, 5: Movable contact, 6: Open/close lever, 7: Rotating shaft, 8: Actuation plate, 9: Actuation pin, 10: Actuation link, 11: Actuation lever, 12 : Operation axis, 13: Drive lever, 1
4: Drive link, 15: Fixed contact, 16: Stopper plate, 17: Spring, 18: Locking pin (locking part), 19, 20: Stopper.

Claims (1)

[Scope of utility model registration request] Opening/closing lever 6 provided outside the switch box 1
a rotating shaft 7 which is rotated by the rotating shaft 7; an operating pin 9 protruding from the tip of an operating plate 8 which is fixed to the rotating shaft 7 and rotates together with the rotating shaft 7; 17 biases the rotating shaft 7 in the rotational direction during the closing operation, and the actuating pin 9
The stopper plate 16 whose rotation in the biasing direction by the spring 17 is restricted by the actuating pin 9 engages with the actuating pin 9, and is provided with a long hole 10a having a length shorter than the movement stroke of the actuating pin 9. A link 10, an operating shaft 12 that rotates in conjunction with the operating link 10, and a link mechanism that converts the rotational movement of the operating shaft 12 into an opening/closing operation movement of the movable contact 5, and a part of the link mechanism. The stopper plate 16
A locking portion 18 is provided, the front end surfaces of which are closely opposed to each other when the movable contact 5 is in the closed state, and which locks the movable contact 5 from opening.
The end surface of the stopper plate 16 is formed so as to be approximately perpendicular to the line of action of the force acting on the locking portion 18 of the link mechanism when the movable contactor 5 in the closing state receives a force in the opening direction. An air switch characterized in that the center of the rotating shaft 7 is located substantially on an extension of the line of action.