JPH0530259Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a switch that switches small currents such as load current, transformer exciting current, or capacitor current.

``Prior art'' In general, a switch with a small current switching ability has a main movable contact and a main fixed contact for conducting current, and an arc movable contact and an arc fixed contact for switching current. We are prepared. When the current is interrupted, first the main movable contact is separated from the main fixed contact, and then the arc movable contact is separated from the arc fixed contact, thereby causing an arc between the main movable contact and the main fixed contact. prevents damage caused by

FIG. 4 shows an example of a conventional switch of this type, in which a main movable contact 3 is fixed to a shaft 2 rotatably supported by a support member 1, and a main movable contact 3 is fixed to the shaft 2 near its base end. An operating rod 4 is connected by a pin 5. Reference numeral 6 denotes a main fixed contact with which the tip of the main movable contact 3 contacts and is held.

On the other hand, an arc movable contact 7 is movably attached to the center of the main movable contact 3 by a pin 8. Reference numeral 9 denotes an arc fixed contact with which the tip of the arc movable contact 7 is contacted and held, and is electrically connected to the main fixed contact 6 by a connecting plate 10 .

To open the circuit of this switch, when the operating rod 4 is moved upward by an operating device (not shown) in the closed state shown by the solid line in FIG. 4, the main movable contact 3 rotates clockwise around the shaft 2. , the tip of the main movable contact 3 separates from the main fixed contact 6.

At this time, the base end of the arc movable contact 7 is rotatably disposed on the main fixed contact 6 by a pin 8, and the tip thereof is held by the arc fixed contact 9 with appropriate contact pressure. Therefore, the arc movable contact 7 does not separate from the arc fixed contact 9 as shown by the two-dot chain line in FIG. Then, the operating rod 4 moves upward and the main movable contact 3
When the arc movable contact 7 rotates clockwise around the shaft 2, the tip of the arc movable contact 7 separates from the arc fixed contact 9. After this, the main movable contact 3 and the arc movable contact 7 move upward together, and the current is briefly cut off between the arc movable contact 7 and the arc fixed contact 9, completing the circuit opening operation. .

"Problem to be solved by the invention" In the above conventional technology, the arc movable contact 7
By utilizing the contact pressure between the main movable contact 3 and the arc fixed contact 9, the arc movable contact 7 is separated from the arc fixed contact 9 after the main movable contact 3 is separated from the main fixed contact 6. ing. Therefore, due to variations in the contact pressure between the arc movable contact 7 and the arc fixed contact 9, the arc movable contact 7 may be separated from the arc fixed contact 9 too early, or the opening timing of each phase may be uneven. As a result, there was a concern that this would have a negative effect on current shedding or overvoltage would occur due to uneven timing of shedding of each phase.

"Means for Solving the Problem" This invention solves the above problems by separating the arc movable contact from the arc fixed contact by the main movable contact after the main movable contact is separated from the main fixed contact by a certain distance. The purpose is to solve the drawbacks of the conventional technology, and the tip part contacts the main fixed contact.
While rotatably supporting the base end of the main movable contact to be gripped, an arc fixed contact having an open top and a closed bottom is electrically connected to the main fixed contact, and the base end An operating rod is connected to the main movable contact, and a center portion near the base end of the arc movable contact whose tip portion contacts and is held by the arc fixed contact is rotatable toward the center of the main movable contact. The main movable contact is electrically connected and disposed, and after the main movable contact is separated from the main fixed contact when the operating rod performs a circuit opening operation, the main movable contact comes into contact with the arc movable contact and the arc movable contact fixes the arc. Constructed to separate from the contact.

``Operation'' During the initial movement of the operating rod, a force is applied in the direction in which the movable arc contact is applied to the fixed arc contact, so that the movable arc contact does not separate from the fixed arc contact. Further movement of the operating rod causes the main movable contact to separate from the main fixed contact. When the main movable contact is separated from the main fixed contact by a certain distance, it comes into contact with the arc movable contact, and the main movable contact and the arc movable contact move upward as one.
The movable arc contact is separated from the fixed arc contact, and the current is briefly interrupted.

"Example" Next, an example of the present invention will be described in detail based on FIGS. 1 to 3. Note that the same parts as those in the above-mentioned prior art are given the same numbers, and the explanation thereof will be omitted.

At the center of the main movable contact 3 fixed to the shaft 2 rotatably supported by the support member 1, there is an L-shaped arc movable contact 17 with a central portion near the base end thereof. It is rotatable by a pin 8 and is electrically connected to and attached to the main movable contact 3. The operating rod 4 is connected to the base end of the arc movable contact 17 by a pin 15.
Further, the tip of the arc movable contactor 17 comes into contact with
The arc fixed contact 19 to be held has an open top and a bottom closed with a connecting plate 20, and is electrically connected to the main fixed contact 6.

Further, at the upper end near the tip of the main movable contact 3, when the main movable contact 3 rotates clockwise around the shaft 2, the arc movable contact 1
A contact plate 21 that contacts 7 is fixed.

Next, the operation of the above embodiment will be explained.

FIG. 1 shows the closed circuit state of the switch, and when the circuit is opened in this state and the operating rod 4 is moved upward by an operating device (not shown), the arc movable contact 17 connected to the operating rod 4 is opened. rotates counterclockwise around the pin 8, that is, in the closing direction, and its tip abuts against the connection plate 20 at the bottom of the arc fixed contact 19. When the operating rod 4 moves further upward in this state, the tip of the movable arc contact 17 is in contact with the connection plate 20 as described above, so the movable arc contact 17 no longer rotates counterclockwise. As a result, the main movable contact 3 rotates clockwise about the shaft 2, and its tip part separates from the main fixed contact 6.

When the main movable contact 3 separates from the main fixed contact 6 by a certain distance, the contact plate 21 of the main movable contact 3 comes into contact with the arc movable contact 17. This state is shown in FIG.

When the operating rod 4 moves further upward from this state, the contact plate 21 of the main movable contact 3 is in contact with the arc movable contact 17, so the arc movable contact 17 moves counterclockwise around the pin 8. Therefore, the main movable contact 3 further rotates clockwise about the shaft 2. As a result, the arc movable contact 17 moves integrally with the main movable contact 3, and its tip part separates from the arc fixed contact 19, and the current is briefly interrupted. This state is shown in FIG.

Thereafter, the main movable contact 3 and the arc movable contact 17 further rotate around the shaft 2 and reach the open circuit position, and the axes of the pin 15, pin 8, and operating rod 4 become substantially in a straight line to open the circuit. The operation ends.

Regarding the circuit closing operation, when the operating rod 4 is moved downward, the axes of the pin 15, the pin 8, and the operating rod 4 are in a substantially straight line.
The arc movable contact 17 and the main movable contact 3 rotate counterclockwise about the shaft 2 as one body.
As a result, the arc movable contact 17 is first brought into contact with and gripped by the arc fixed contact 19, and then the main movable contact 3 is brought into contact with and gripped by the main fixed contact 6, which is performed in an operation completely opposite to the circuit opening operation described above. Therefore, the details will be omitted.

"Effects of the Invention" As described above in detail with the embodiments, according to the present invention, the arc movable contact is separated from the arc fixed contact when the main movable contact is separated from the main fixed contact by a certain distance. Sometimes this is done by this main movable contact coming into contact with the arc movable contact, so
Always in a fixed position.

Therefore, as in the prior art, the arc movable contact does not separate too quickly from the arc fixed contact or misalignment of each phase occurs, and as a result, adverse effects on current flow and overvoltage are prevented. can do.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a front view showing a closed circuit state, FIGS. 2 and 3 are front views showing a state in the middle of an opening operation, and FIG. 4 is a conventional technique. It is a front view showing an example. In the figure, 2 is the shaft, 3 is the main movable contact, 4 is the operating rod, 6 is the main fixed contact, 17 is the arc movable contact, 19 is the arc fixed contact, 20 is the connection plate, and 21 is the contact plate. , is.

Claims (1)

[Scope of Claim for Utility Model Registration] An arc fixed contact whose tip part rotatably supports the base end of a main movable contact whose tip contacts and is held by the main fixed contact, whose top is open and whose bottom is closed. near the base end of the arc movable contact whose tip is in contact with and gripped by the arc fixed contact, the operating rod is connected to the base end of the arc movable contact is rotatably and electrically connected to the central part of the main movable contact, and the main movable contact is connected to the main movable contact when the main movable contact is separated from the main fixed contact. , a contact plate is disposed that contacts the arc contact, and after the main movable contact is separated from the main fixed contact during a circuit opening operation by the operating rod,
the contact plate contacts the arc movable contact;
A switch characterized in that the arc movable contact and the main movable contact rotate together, and the arc movable contact is separated from the arc fixed contact.