JPS6136050Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tripping mechanism for circuits and disconnectors.

The conventional tripping mechanism for circuit breakers and disconnectors consists of bimetals, tripping fittings, plunger-type electromagnetic devices, latch fittings, etc. When an overcurrent or short-circuit current flows in the electrical circuit and the bimetal or plunger operates, The tripping metal piece rotates to unlatch the latch metal piece, thereby destroying the balance of the opening/closing trip mechanism composed of the link mechanism, the movable contact plate, and the return spring, and causing the movable contact plate to perform an opening operation.

However, in this tripping mechanism, the tripping bracket is pushed by a bimetal or the like and rotates, and after the latch bracket is unlatched, the tripping bracket rotates in conjunction with the rotation of the latch bracket, and the tripping bracket is rotated. The tripping fitting rotated more than the required rotation. Therefore, there is a problem in that the lower end of the tripping fitting comes into contact with the bimetal, causing spark discharge and changing the bimetal characteristics. For this reason, it was necessary to apply insulating tape to the contact area or to enlarge the insulating space.

Therefore, the purpose of this invention is to provide a tripping mechanism that can prevent contact without increasing the insulation space or applying insulation tape.

An embodiment of this invention is shown in FIGS. 1 to 3. That is, this tripping mechanism includes a tripping member made up of two parts. The first tripping member 160 has a hole formed in its middle portion and is rotatably supported on the fixed shaft 93, and has an upper end 161 as a bimetal sensing portion, a lower end 162 as a plunger sensing portion, and a supporting frame 68. It is regulated and supported in the standby position by a tension-type return coil spring 163 with one end hung. The second tripping member 164 is U-shaped,
A hole is formed in the lower end to rotatably support the fixed shaft 93, and the upper end of the first tripping member 160 is surrounded, and an engaging piece 165 is protruded in the rotational direction to engage the first tripping member 160. A latch receiving stage 166 is formed on the mating piece 165, and the tension type return coil spring 167 is hooked on the support frame 68 and rotated counterclockwise to release the first tripping member 1.
60 and is in the normal posture. The latch fitting 168 is rotatably supported by a fixed shaft 169, and an intermediate shaft 171 is passed through the arcuate groove 170 of the latch metal fitting 168.
A first link 172 forming a ring mechanism at 71
and a second link 173, the first link 172 is pivotally connected to the handle link 174 and the handle 175, the second link 173 is pivotally connected to the movable contact 176, and the movable contact 176 is used for contact pressure and return. A spring 177 is applied. In addition, 178 is an interlocking tripping body pivotally supported by the fixed shaft 93, which links multiple poles of the circuit breakers with the tripping operation of one pole, and a second tripping body is provided for each mechanism part. 164
The plurality of poles are arranged in parallel to the first tripping body 160 on the inner side thereof, and are connected to each other by an interlocking rod (not shown). For example, when an arbitrary pole is tripped and the interlocking tripping body 178 is rotated by the latch fitting 168,
Since the interlocking tripping body 178 has a plurality of poles connected by an interlocking rod, it pushes the second tripping body 164 of the other pole via each interlocking tripping body of the mechanism section of the other pole, and the mechanism section of that pole. Make the trip work.

This tripping mechanism operates when the bimetal 33 or the output rod 41 of the plunger 39 operates due to an overcurrent or short-circuit current flowing through the electrical circuit (second
), depending on the bimetal 33, the sensing part (upper end 161) of the first tripping member 160 is pushed, and depending on the plunger 39, the first tripping member 160 is pressed.
The sensing part (lower end 162) of is pushed and rotates clockwise in either case. First tripping member 1
60, the second tripping member 164 is pushed and rotated, and the latch fitting 168 is unlatched from the receiving stage 166 of the engagement piece 165. When the latch fitting 168 is removed from the receiving stage 166, the movable contact 176 and the second
The latch fitting 164 is rotated counterclockwise through the link 173 of the link mechanism 172, 17.
3 becomes unbalanced, the movable contact 176 performs an opening operation, and the handle 175 trips to a neutral position.

During this time, the latch fitting 168 rotates to the base of the engagement piece 165, and the second tripping member 164 rotates in conjunction with this. In this case, since the first tripping member 160 does not rotate due to the rotation of the second tripping member 164, this interlocking rotation causes the lower end of the first tripping member 160 to move toward the bimetal 33. Therefore, there is no spark discharge between the bimetal 33 and the bimetal 33, and there is no need to attach an insulating tape or provide an insulating space.

As mentioned above, the tripping mechanism of this invention consists of two parts for the tripping member, and the interlocking action of the latch member prevents it from coming into contact with the bimetal.
This has the effect of preventing spark discharge and preventing it from affecting bimetal characteristics.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a circuit breaker to which an embodiment of the present invention is applied, FIG. 2 is a side view of the main part in a tripped state, and FIG. 3 is an exploded perspective view of the main part. 33...Bimetal, 39...Plunger, 1
60...First tripping member, 161...Upper end (one end), 162...Lower end (other end), 164
... second tripping member, 168 ... latch fitting,
X... Plunger type electromagnet device.

Claims (1)

[Scope of utility model registration request] a bimetal that detects overcurrent; a first tripping member whose intermediate portion is supported by a support shaft and faces the bimetal, and whose one end is pushed and rotated by the action of the bimetal; an electromagnetic device that rotates the first tripping member by means of a short circuit current, facing the other end of the first tripping member; A second tripping member whose other end is pushed by the rotation of one end of the first tripping member and rotates; and a second tripping member latched to the second tripping member.
A tripping mechanism comprising a tripping latch member that is released by rotation of the tripping member.