JPS60230333A - 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] [Field of Application of the Invention] The present invention relates to a wiring circuit having an overcurrent detection section composed of static elements and a magnetic release type draw device operated by a signal from the same cypress. Regarding circuit breakers.

[Background of the invention]

Conventionally, a small circuit breaker with a rated current of about 50 A has a contact opening/closing mechanism that uses an operating handle and an opening/closing link to push down a crossbar that engages with a movable contact block and moves up and down to close the contacts. A mechanism is often used in which the contact is opened by releasing the pressing force of the crossbar and pushing up the crossbar with a disengagement spring, and a mechanical thermal electromagnetic tripping device has been used as the overcurrent disconnecting device.

In a circuit breaker that has such a mechanical tripping device, there is no need to reset the tripping device, but when using a magnetic release type disconnection device that operates by a signal from the overcurrent detector, it is necessary to reset the tripping device. Since the holding force of the form release device is small, it is essential to reset the latch part of the tripping mechanism after the tripping operation and to mechanically reset the magnetic release form release device using an external force. In circuit breakers, it is required to be able to reliably reset the trip device without increasing the size of the mechanism, and adding a reset mechanism to the trip device makes opening and closing operations of the 21 handles difficult. The tripping device must not malfunction due to impact during opening/closing operations.

[Object of the Invention] It is an object of the present invention to ensure that the magnetic release form release device and the latch can be reset together without increasing the size of the mechanism, and that the handle operation becomes heavy and the tripping device is removed during opening/closing operations. The object of the present invention is to provide a circuit breaker that does not malfunction.

[Summary of the invention]

The present invention provides a fixed contact base and a movable contact base arranged opposite each other, a crossbar that engages with the movable contact base and moves up and down, and an operation in which the crossbar is pushed down against a spring for opening during a closing operation. A device having an opening/closing operation mechanism consisting of a handle and an opening/closing link includes a magnetic release form release device having a movable core that is attracted and held in a steady position by a permanent porcelain stone and released by the energization of an excitation coil, and the opening/closing link and a crossbar. - a first tripping member biased in a direction from a tripping position where the opening/closing link is disengaged to a normal position where the opening/closing link is held in an engaged state with the upper end surface of the crossbar;
a second tripping member that is always biased to keep the first tripping member in a normal position; and a second tripping member that is always held in a normal position separated from the second tripping member by the movable core, and releasing the movable core. Press the second tripping member with W
a third tripping member biased to move to a tripping position where it disengages from the J1 tripping member;
As the third tripping member moves to the tripping position, the tripping member protrudes onto the movement path of the opening/closing link, and is pressed by the opening/closing link when the operating handle is reset, causing the third tripping member to move. The circuit breaker is characterized in that it includes a reset member that returns the movable core to a normal position and removes the load on the movable core and the second tripping member.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be clearly explained with reference to FIGS. 1 to 10.

FIG. 1 is a cross-sectional view of the central pole of the circuit breaker of this embodiment.
An example of application to a circuit breaker for both overcurrent and earth leakage protection is shown.

The load current is transmitted through the power supply side terminal 16, fixed contact block 14, fixed contact 13, movable contact 12, movable contact block 11, through conductor 29,
A zero-phase current transformer 2 for earth leakage detection detects the load current of each phase flowing through the load side terminal block 30 and the load side gutter 1 and flowing through the same electrical circuit.
7 and an overcurrent detection current transformer 28, the tripping circuit section 26 performs leakage detection and overcurrent detection based on the outputs of these transformers 27 and 28, and after a predetermined delay time, the tripping circuit section 26 The signal generated from the circuit energizes the excitation coil 38 of the magnetic release mode removing device 15 shown in FIGS. 3, 9, and 1Q1 to trip the circuit breaker.

1 is a molded case of the circuit breaker, and 2 is its cover. The operation handle 3 protrudes from the cover 2 to open and close the circuit breaker.
It is done by The operating handle 6 is attached to the fixed frame 21 by a support pin 4 and rotates left and right about the support pin A.

Further, one end of the operating handle 3 is connected to one end of the opening/closing link 6 by a support pin 5, and the support pin 5 connects to one end of the opening/closing link 60.
It is the center of rotation.

Now, when the operating handle 3 is rotated clockwise from the position shown in FIG. 1 (closed position), the support pin 5 also moves clockwise on an arc centered on the support pin d. Therefore, as the operating handle 30 rotates, the roller 7 attached to the other end of the opening/closing link 6 by the support pin 8 moves to the first tripping member 2.
Move upward along the side of 0. The force that moves this roller 7 upward is applied to a separating spring 10 located below the crossbar 9 engaged with the movable contact base 11 of each phase, and a position between the movable contact base 11 of each phase and the case 1. Contact spring 1
7.

FIG. 2 shows this operation. As the operating handle 30 is rotated clockwise, the support bin 5 and roller 7 are moved to the positions indicated by 1fiJ5a and 7a, so that they are in the downward position in a closed circuit state. The cross spar 9 moves to the upper position indicated by the broken line 9', completing the opening operation.

At this time, the movable contact base 11 is pushed up by the contact spring 17 until one end thereof contacts the stopper 18, and after contacting the stopper 1B, it rotates clockwise about this contact part as a fulcrum. and a movable contact 1 provided at the other end.
2 is separated from the fixed contact 15.

During the closing operation, the force of the hand that moves the operating handle 6 counterclockwise acts through the opening/closing link 6 and the roller 7 in a direction to push down the crossbar 9. This force overcomes the separation spring 10 and pushes the movable contact base 11 downward, causing the movable contact 12
The fixed contact 13 comes into contact with the fixed contact 13, resulting in the closed circuit state shown in FIG. In the closed circuit state, the movable contact base 11 is separated from the stopper 18, and the force stored in the contact barb 17 applies contact pressure between the contacts 12 and 13.

Next, the trip mechanism and reset mechanism will be described. The first tripping member 20 constitutes a latch together with the second tripping member 24, and as shown in FIGS. 1 and 2, the tip of the first tripping member 20 is normally connected to the second tripping member. engaged with one end 24a of 2A to be kept in a steady position;
The roller 7 is held in a state of engagement with the upper end surface of the cross spar 9 by the lateral pressure of the roller 7. The first tripping member 20 and the second tripping member 24 each have a support bin 19
It is attached to the fixed frame 21 so as to be rotatable around the fixed frame 21 and 25, and is biased clockwise by return springs 32 and 33, which are provided between the fixed frame 21 and the fixed frame 21, respectively. Note that the second tripping member 2AK is always in contact with the fixed frame 21 and the second tripping member 2AK is in contact with the fixed frame 21 at all times.
A bent portion 2Ac is provided to limit rotation in the clockwise direction.

3N is a right side view of FIG. 2. As shown in FIGS. 2 and 3, the third tripping member 26 is connected to the second tripping member 24.
It is attached to the fixed frame 21 so as to be rotatable around a common support bin 25, and is biased counterclockwise by a return spring 5AVC attached between the fixed frame 21 and the fixed frame 21. A rivet 25a made of a non-magnetic material is provided at one end of the third tripping member 23, and extends from the intermediate portion of the fifth tripping member 23 toward the first tripping member 20. The material 23b is integrally provided.

The magnetic release type trip device 15 is arranged on the side of the fixed frame 21 as shown in FIG.

As shown in detail in FIG. 9, this magnetic release type trip device 15 consists of a movable core 22, a fixed core 56, a holding permanent magnet 37, an excitation coil 38, and a trip device case 39 that houses these parts. , the excitation coil 38 is connected to the output terminal of the trip circuit section 26 shown in FIG. 1 through a lead wire AOK. The permanent magnet 57 is arranged such that one pole is in contact with the fixed core 36 and the other pole is opposed to the movable core 22 via an air gap, and the knife portion 36a at one end of the fixed core 36 is used as a rotation fulcrum. The movable core 22 is constantly moved by the magnetic flux of the permanent magnet 37.
As shown by the solid line -, it is in a state where it is attracted and held by the fixed core 36. At this time, the end of the movable core 22 protruding from the case 39 comes into contact with the rivet 23 a made of a non-magnetic material provided at one end of the third tripping member 23 and reduces the load of the third tripping member return spring 5A. The third tripping member 23 is held in the normal position shown in FIG. 2 by the magnetic holding force that overcomes this load. The third tripping member 23 is separated from the second tripping member 24 in the normal position, and the reset member 25b is also in a position retreated from the movement path of the opening/closing link 6 and roller 7 during the opening/closing operation. The third mechanical shock is caused by the opening and closing operations of the link 6, roller 7, etc.
By being transmitted to the movable core 22 via the tripping member 26 and the reset member 23b, the movable core 22 is moved to the fixed core 3.
6 and cause malfunction (mistrip),
During the opening/closing operation, an extra square load is not formed to move the 1cIJ set member 23b, and the replacement of the handle 6 is not made difficult.

4th South is a diagram showing the movement of each part during a tripping operation. Device 1 for removing the magnetic release form from the closed state shown in FIG.
When the excitation coil 38 of No. 5 is energized, the magnetic flux of the permanent magnet 37 passing through the armature surfaces of the movable core 22 and fixed core 66 is canceled by the magnetic flux generated by the excitation coil 38, and the magnetic coercive force of the armature surface is reduced. Since the load of the third tripping member becomes weaker than that of the return spring 54, the movable core 22 separates from the fixed core 36 as shown by the broken line 22' in FIG. The rivet 26a made of material is the ninth
It rotates counterclockwise about the support pin 25 until it reaches the position indicated by the broken line 23'a in the figure.

At this time, the third tripping member 23 is connected to the second tripping member 2.
4, and press the end 2'4b of the second tripping member 24.
is rotated counterclockwise around the same support pin 25. Due to this rotation of the second tripping member 24, the first tripping member 20 and the second tripping member 24 are disengaged, and the first tripping member 20 is rotated around the support pin 19 due to the side pressure received from the roller 7. Rotated counterclockwise.

Due to this rotation of the first tripping member 20, the roller 7, which had been at the position shown by the broken line 7c, moves to the position shown by the solid line and is removed from the cross spar 9, so that the cross spar 9 is broken by the separation bar 10. It is pushed up to the position indicated by J9', and the movable contact 12 is separated from the fixed contact 413. As the third tripping member 23 rotates counterclockwise, the reset member 23b also moves in the same direction, and when the tripping operation is completed, the tip of the reset member 23b touches the crossbar 9.
The roller 7 comes to a protruding position on the moving path of the roller 7 along the side surface of the roller.

In addition, from the return spring 55 (Fig. 747) K attached to the support pin aVcMr of the operating handle 5, when the tripping operation is completed, f
The operating handle 3 is located approximately halfway between the open position and the closed position,
Performs a trip display. By moving the operating handle 3 to the intermediate position, the support pin 5 moves to the position shown by broken line 95b, and the roller 7 moves to the position shown by broken line 7b.

FIG. 5 is a diagram showing instructions for each part at the time of reset. After the tripping operation, rotate the operating nozzle 3 clockwise.

By this reset operation of the operating handle 3, the support pin 5 moves from the position 5b to the position 5d, and accordingly the roller 7 moves upward along the side surface of the cross spar 9 from the position 7b to the position 7d.

During this movement, the roller 7 presses the tip of the reset member 23b, causing the third tripping member 23 to rotate clockwise about the support pin 25. By this rotation of the fifth tripping member 230, the load of the third tripping member return spring 64, which was applied to the movable core 22 via the rivet 23a made of a non-magnetic material, is removed.

As shown in FIG. 9, the movable core 22 forms a part of the magnetic circuit of the permanent magnet 37, and when the excitation coil 68 is released, the attractive force of the permanent magnet 37 is always applied. Therefore, the above reset operation causes the return spring '5A to
When the load is removed, the movable core 22 moves to the fixed core 36
will be absorbed and automatically reset.

On the other hand, as the roller 7 moves upward by the reset operation of the operating handle 3, the first tripping member 20 rotates clockwise about the support pin 19 and returns to its normal position. Thereafter, as the support pin 5 moves to the position 50 due to the overstroke of the operating handle 3 shown in FIG. The member 20 is further rotated clockwise by the return spring 32, and a clearance necessary for engagement of the latch portion is secured between the first tripping member 20 and the second tripping member 240, so that the third closing Sushi member 23V
The second tripping member 24 released from the pressure by C is rotated clockwise by the return spring 65vC and returns to the position where it re-engages with the first tripping member 20.

With the above steps, the reset operation is completed, and the opening/closing operation described above can be performed.

Since this reset II operation is performed using the movement of the opening/closing link 6 and roller 7 that constitute the opening/closing operation mechanism, the third tripping member 23 and the reset member 23b at the time of resetting are
It is expected that the movement will be large and reliable operation will be achieved, and this third
The movement of the tripping member 25 can also be used to easily operate an auxiliary switch (not shown) of the tripping unit. Further, in this embodiment, the roller 7 and the reset member 23
Since there is rolling contact with the handle b, the frictional resistance that causes a load on the reset operation is small, and the handle can be moved easily.

In order to facilitate understanding, FIG. 8 1 shows the movements of each part in the above-mentioned opening/closing operation, closing operation, and resetting operation.

Next, the provision of a rivet 23a made of a non-magnetic material at the contact portion of the third tripping member 23 with the movable core 22 will be explained. Since the magnetic release type trip device 15 is equipped with a permanent magnet 37 for constantly attracting and holding the movable core 22, mechanical parts such as the fixed frame 21 and the sixth trip member 23 are made of magnetic materials such as iron plates. In this case, as shown by arrow B in FIG. Fixed core 5
The magnetic flux of the permanent magnet 37 passing through the armature surface of the magnet 6 is reduced, which tends to cause a decrease in holding force and variations. In order to deal with this, it is necessary to interrupt the magnetic circuit between the movable core 22 and the fifth drawstring member 23, and the magnetic circuit 23a made of non-magnetic material is provided as one means for this purpose. It is. The rivets 23a made of a non-magnetic material may be provided on the movable core 22.

In the circuit breaker using the above-mentioned reset mechanism, the overstroke (dimension A shown in Fig. 10) of the sixth tripping member 23 at the time of resetting is made sufficiently large in order to allow for dimensional errors during assembly. It is desirable to take However, since the holding force of the movable core 22 of the magnetic release type trip device is weak, if the overstroke at the time of resetting the fifth trip member 23 is large, the rivet made of non-magnetic material 23a
When the movable core 22 hits the movable core 22, the impact force may cause the movable core 22 to separate, causing a mistrip.

Means for dealing with this are shown in FIGS. 11 to 13.

First, the configuration and effects of FIG. 11 will be explained.

In this example, a V-shaped VC molded plate genera 23c is caulked together with a rivet 23a made of a non-magnetic material and a third tripping member 23K. As shown at 23'C, the leaf spring 23c is in contact with the movable core 22, and the rivet 2
During the period 1 when 3a contacts the movable core 22 and reaches a steady state of elongation, the plate ribs 23c absorb the impact force and prevent mistrips.

The leaf spring 23C needs to be designed to be weaker than the return spring 64 of the sixth tripping member 23. It should be noted that when the third tripping member 230 is overstroked, the reciprocating spring 23c comes into contact with a portion close to the rotation support of the movable tip 220, so the moment of the initial load received by the movable core 22 is reduced, and the impact is accordingly reduced. There will be more room for power.

FIG. 12 shows another example in which a buffer plate genera 23d is attached to the movable core 22. This leaf spring 23 (i is a broken line 23 when the third tripping member 23 is overstroked)
As shown by 'd, it contacts the rivet 23a made of non-magnetic material and absorbs the impact force.

FIG. 13 shows another example in which a lumpy elastic body 23e, such as rubber, is attached to the bending member 3 as a shock absorber. If the leaf springs 23c, 23d and the bulk elastic body 26e are made of non-magnetic material, magnetic flux leakage from the movable core 22 to the third tripping member 23 can be dealt with.

〔Effect of the invention〕

In the present invention, the resetting member and the third tripping member interlocked therewith are reset using the movement of the opening/closing link caused by the reset operation of the handle, and the movable core of the second tripping member and the magnetic release type tripping device is operated. By removing the load on the tripping member, one reset mechanism can simultaneously reset the latch portions of the first tripping member and the second tripping member and reset the movable core of the magnetic release type tripping device. It is possible to reliably reset a circuit breaker equipped with a magnetic release type trip device without having to change the shape of the circuit breaker.

Furthermore, after resetting, the reset member and the opening/closing link, as well as the third tripping member and the second tripping member, are maintained in a non-contact state, so that the impact caused by the opening/closing operation is transmitted through the reset mechanism to the magnetically released type. Mistrips can be avoided by transmitting the information to the release device, and the reset mechanism does not become a part of the opening/closing operation, allowing the handle to be operated easily.

[Brief explanation of drawings]

Figure 1 is a central cross-sectional view of a circuit breaker that is an embodiment of the present invention, Figure 2 is a cross-sectional view of the main parts showing the movement of the mechanism during opening and closing operations, and Figure 3 is the right side of the circuit breaker 21\1. 1 lead, Figure 4 is a cross-sectional view of the main part showing the movement of the mechanism part during the trip operation, Figure 5 is a cross-sectional view of the main part showing the movement of the mechanism part during the reset operation, and Figure 6 is the main part cross-sectional view showing the movement of the mechanism part during the reset operation. Figure 7 is a detailed view of the operating handle attachment part, Figure 8 is a diagram summarizing the movement of the mechanism during each operation, Figures 9 and 10 are of the magnetically released type. Figures 11 to 15, which show the internal structure and related parts of the trip device with the cover removed, show examples of buffer means provided between the movable core and the sixth trip member of the magnetic release type trip device. This is the meat shown. 3: Operation handle, 6: Opening/closing link, 9: Crossbar,
10: Opening spring, 11: Movable contact base, 14: Fixed contact base, 15: Magnetic release type tripping device, 20: First tripping member, 22: Movable core, 23: Third tripping member ,2
3b=reset member, 27I: second tripping member, 32
: Return spring that biases the first trip member 20, 33: Return spring that biases the second trip member 24, 3A: Third trip agent, patent attorney Akio Takahashi et al. Hitoshi Figure 8, Figure 9 figure

Claims (1)

[Claims] A fixed contact block and a movable contact block are arranged opposite each other.A crossbar that engages with the movable contact block and moves up and down, and an operation handle and opening/closing link that push down the crossbar against a spring for closing during the closing operation. A magnetic release type tripping device having a movable core that is attracted and held in a steady position by a permanent magnet and released by the urging of an excitation coil; a first tripping member biased in a direction from a tripping position where the engagement is released to a normal position where the opening/closing link is held in a state where it is engaged with the upper end surface of the crossbar;
a second tripping member biased to keep the tripping member in a normal position; Press the tripping member to move to the tripping position to release the engagement with the first tripping member 5
The sixth tripping member is energized by the third tripping member, and as the fifth tripping member moves to the tripping position, the fifth tripping member projects onto the movement path of the opening/closing link and resets the operating handle. A circuit breaker comprising a reset member that is pressed by the opening/closing link during operation to return the third tripping member to a normal position and remove the load on the movable core and the second tripping member.