JPH0222925Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an instantaneous tripping adjustment device for a circuit breaker, and in particular, the instantaneous tripping current setting value is adjusted by changing the gap between the fixed iron core of the instantaneous tripping electromagnetic device and the opposing movable iron piece. The adjustments made are related to improvements.

Conventionally, in this type of instantaneous tripping electromagnet device, in which the instantaneous tripping current setting value is changed and adjusted by changing the gap between the fixed core and the opposing movable iron piece, the movable iron piece return spring usually has one end attached to the movable iron piece and the other end. is suspended between a fixed member, and when the opposing gap between the fixed iron core and the movable iron piece is changed, the starting load of the movable iron piece changes because the movable iron piece return spring expands and contracts.
For example, when the opposing gap between the fixed core and the movable armature is changed to decrease, the load on the movable armature return spring generally tends to increase, and due to the change in the starting load of the movable armature, the instantaneous tripping current The drawback was that the adjustable range of the set value was limited.

In addition, the gap between the fixed iron core and the opposing movable iron piece of the above-mentioned instantaneous tripping electromagnet device can be adjusted by one adjustable member, and the movable iron piece of each pole is interlocked with the movable iron piece of each pole. Generally, the acting force of the movable iron return spring is transmitted to the interlocking member and the adjustable member.
Finally, in order to receive the acting force of the movable iron return spring at the position where one adjustable member is provided, the rod-shaped interlocking member that interlocks the multiple poles is twisted due to flexure, and the instantaneous tripping current value of each pole is The disadvantage was that it caused errors.

Therefore, the main purpose of this invention is to widen the adjustable range of the instantaneous tripping current setting value and to stabilize the instantaneous tripping current setting value of the circuit breaker to avoid errors in adjusting the instantaneous tripping current setting value of each pole. An object of the present invention is to provide a tripping adjustment device.

To summarize this invention, the instantaneous trip adjustment device for a circuit breaker adjusts the opposing gap between the fixed core and the movable iron piece of the instantaneous trip electromagnetic device, and the gap between the movable iron piece and the interlocking member. A movable iron piece return spring is installed, and the rotation axis of the movable iron piece and the rotation axis of the interlocking member are provided on the same axis center line, and the adjustable member is installed on the interlocking member, the movable iron piece return spring, and the interlocking member. The movable iron piece is integrally rotated through an adjusting screw, so that the gap between the movable iron piece and the fixed iron core can be adjusted.

The above objects and other objects and features of the present invention will become clearer from the detailed description given below with reference to the drawings.

As shown in FIGS. 1 and 2, the closing envelope of the circuit breaker consists of a mold base 1 and a mold cover 2 made of an insulating material, and the tip of the operating handle 3 is connected to the upper surface of the mold cover 2. It is provided so as to protrude from the. A trip lever 4 operatively connected to the operating handle 3 has one end releasably engaged with a hook pin 5a provided on the hook 5. The trip member 6 for multi-polar interlocking is a rotation support plate 6 having an integrally attached engagement claw 6b.
A hook 5 is rotatably supported on the fixed frame member by a, and is also rotatably supported on the fixed frame member.
The engaging protrusion piece 5b and the engaging claw 6b of the trip member 6
and are releasably engaged.

The instantaneous tripping electromagnet device 7 includes a fixed iron core 8, a yoke 9, a movable iron piece 10, a movable iron piece return spring 16, and an excitation conductor 14a that energizes the electromagnet. The fixed iron core 8 is formed in a cylindrical shape, and is attached to the center of a yoke 9 that is fixed to the bottom wall of the mold base 1 and raised in a U-shape along the inner wall at the end of the mold base 1. has been done. A movable iron support portion 9a is formed at the upper end of the yoke 9 and projects from both wings. The movable iron piece 10 has its center portion rotatably supported by a shaft 11 on the support portion 9a of the yoke 9, and is provided such that its lower end portion corresponds to the fixed iron core 8, and its upper end bent portion 10a corresponds to the trip member 6. It is being

A relay connection terminal 12 for the main current conductor is provided at the bottom of the molded base 1 of the circuit breaker.
One of the connecting members 13 is connected to a movable contact via a flexible conductor, and the other main current conductor 14, whose one end is connected to the connecting member 13 by the relay connecting terminal 12, is connected to the fixed iron core 8 and the yoke. It has an excitation conductor 14a that penetrates between the upper part of 9 and the other end is connected to an external connection conductive terminal 15. Moreover, the excitation conductor 14a is formed so as to wind the fixed iron core 8 when the rated current is small.

The interlocking member 17 made of an insulating material is provided to extend across the instantaneous tripping electromagnet device 7 of each pole, and forms the spring mounting piece 18a of the movable iron return spring 16 of the instantaneous tripping electromagnet device 7 of each pole. A mounting metal piece 18 is integrally provided so as to correspond to the movable iron piece 10 of each pole, and the mounting metal piece 18 corresponding to both end poles of the interlocking member 17 has a rotation of the movable iron piece 10 of each instantaneous tripping electromagnet device 7. A rotary support arm 1 bent to be rotatably supported on an extension of a shaft 11
8b is formed. The rotation axes of the movable iron piece 10 and the interlocking member 17 are provided on the same axis center line.
The movable iron piece return spring 16 is installed between the tip of the bent portion 10a of the movable iron core 10 and the spring mounting piece 18a of the mounting metal piece 18 integrated with the interlocking member 17.

Each adjustable member 19 for instantaneous tripping current setting value
is an operation knob 19a provided so as to be exposed on the upper surface of the molded cover 2 of the closing envelope of the circuit breaker.
and an adjustment cam 19b that rotates together with this, and the gap g between the fixed iron core 8 and the movable iron piece 10 is simultaneously adjusted by the rotation of this adjustable member 19 via the interlocking member 17 of the movable iron piece 10. The adjusting cam 19b is integrally attached to the lower end of the operation knob 19a, and the metal piece 1 of the interlocking member 17 of the corresponding pole on which the operation knob 19a is installed.
8 is provided with an adjusting cam contact protrusion piece 18c so as to be in contact with the adjustment cam 19b, and as shown in FIG. A member return spring 21 is installed between the interlocking member 17 and the fixed member 20. An adjustment screw 22 serving as a stopper for the movable iron piece 10 is attached to the interlocking member 17 at a position corresponding to the movable iron piece 10 of each pole.

Next, the operation of the instantaneous tripping device for a circuit breaker of this invention constructed as described above will be explained. When the instantaneous trip setting current flows through the excitation conductor 14a, the lower end of the movable iron piece 10 is attracted to the fixed iron core 8 against the movable iron piece return spring 16 due to the generated magnetic flux, and the movable iron piece 10 is rotated to close the bent portion 10a. The corresponding trip member 6 is pressed, and the trip member 6 is rotated clockwise to cause the engagement claw 6b of the trip member to engage with the engagement projection piece 5b of the hook 5, and the engagement between the hook pin 5a and the trip lever 4. The locks are sequentially released, the opening/closing mechanism is collapsed, and the circuit breaker is opened. Now, when adjusting the instantaneous tripping current setting value, when the adjustable member 19 is rotated, the interlocking member 17
is rotated and displaced about the rotation shaft 11 as a fulcrum. Along with this, the movable iron piece 10 is also rotated about the rotation shaft 11 by displacement of the adjustment screw 22 provided on the interlocking member, and the gap g with the fixed iron core 8 can be adjusted to be larger or smaller. At this time, the movable iron piece return spring 16 has one end installed between the upper end of the movable iron piece 10 and the interlocking member 17, and the movable iron piece 10
Since the rotation axes of the movable iron piece 10 and the interlocking member 17 are provided on the same axis center line, they rotate smoothly together with the movable iron piece 10 and the interlocking member 17 without any expansion or contraction.

As described above, the circuit breaker is equipped with an instantaneous tripping electromagnet device 7 provided on each pole that performs a tripping operation by rotating the trip member 6 common to each pole, and a movable electromagnet device 7 facing the fixed core 8 of the electromagnet device. In a device in which the gap between the iron core 10 and the iron core 10 is adjusted simultaneously for each pole by rotating the interlocking member 17 that interlocks with the movable iron piece 10 of each pole using one adjustable member 19, the movable iron piece 10 and the interlocking member 17 between the movable iron piece return spring 1
6 is constructed, and the movable iron piece 10 of each pole is separated from each other, a rotating shaft 11, and a constantly interlocking member return spring 2.
1 biased towards the adjustable member 19 by the interlocking member 1
7 is provided on the same axis center line, and
The movable iron piece 10 is integrally rotated by two adjustable members 19 via an interlocking member 17, a movable iron piece return spring 16, and an adjustment screw 22 provided on the interlocking member 17, and a movable iron piece. Compared to conventional devices, where one end of the return spring is suspended between the movable iron piece and the other end between the fixed member and the starting load of the movable iron piece changes due to expansion and contraction of the movable iron piece return spring during adjustment by the adjustable member, For example, the operation knob 19a
The instantaneous tripping current value is the same value S at the center adjustment position of
In Fig. 4, which shows the instantaneous tripping current characteristics with respect to the gap g between the fixed iron core and the movable iron piece of the present device and the conventional device when set at is shown by the P'-Q' line, and the conventional device changes as shown by the P'-Q' line.In the present device, the current width I ₂ /I ₁ within the adjustable range by the operation knob is different from that of the conventional device. is larger than the current width I' ₂ /I' ₁ in the adjustable range, and the force of the movable core return spring does not act on the interlocking member as a torsional force, so there is no error in the instantaneous tripping current value of each pole, etc. This has practical effects.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a circuit breaker equipped with the instantaneous trip adjustment device of this invention, Fig. 2 is a partially cutaway plan view of the circuit breaker shown in Fig. 1, and Fig. 3 is an interlocking member return spring. Fig. 4 is a diagram showing the instantaneous tripping current characteristics of the proposed device and the conventional device with respect to the gap between the fixed iron core and the movable iron piece, and Fig. 5 is the instantaneous tripping adjustment of the circuit breaker of this invention. FIG. 2 is a perspective view showing a main part of the device. In the figure, 1...Mold base, 2...Mold cover, 3...Operation handle, 4...Trip lever, 5...Hook, 6...Trip member, 7...
... Instantaneous tripping electromagnet device, 8 ... Fixed iron core, 9
... Yoke, 10 ... Movable iron piece, 16 ... Movable iron piece return spring, 17 ... Interlocking spring, 18 ... Mounting metal piece, 19 ... Adjustable member, 19a ... Operation knob,
19b...adjustment cam, 20...fixing member, 21...
...Interlocking member return spring.

Claims (1)

[Scope of utility model registration request] The circuit breaker is equipped with an instantaneous tripping electromagnetic device provided on each pole to perform a tripping operation by rotating a trip member common to each pole of the circuit breaker, and each pole is separated from the fixed core of the electromagnet device. The gap between the movable iron piece and the movable iron piece supported by the rotation shaft is adjusted simultaneously for each pole by rotating an interlocking member that interlocks with the movable iron piece of each pole using one adjustable member, wherein said movable iron piece A movable iron piece return spring is installed between the movable iron piece and the interlocking member, and the rotation axis of the movable iron piece and the rotation axis of the interlocking member that is always biased toward the adjustable member side by the interlocking member return spring are the same axis. A circuit breaker which is provided on a center line, and wherein a movable iron piece is rotated integrally by the adjustable member via the interlocking member, a movable iron piece return spring, and an adjustment screw provided on the interlocking member. instantaneous trip adjustment device.