JPS62252027A - 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 [Technical Field] The present invention relates to a circuit breaker that opens a movable contact when an overcurrent, short circuit current, or the like flows.

[Background Art] This type of circuit breaker generally opens a movable contact by disrupting the symmetry of a link mechanism when an overcurrent or short-circuit current flows.

In this case, for example, when a short-circuit current flows and the movable contact is opened, the contact is opened after waiting for the operation of the link mechanism, so the opening is delayed by the response time, and therefore the high-speed current limiting and breaking performance is not sufficient.

Therefore, in order to solve this problem, the applicant of the present application proposed in Japanese Patent Application No. 60-240008 that the movable contact is opened regardless of the imbalance of the link mechanism when a short-circuit current flows, and the high-speed IlIl connection is made. The circuit W disconnector, which improves the current performance, was made in vain. However, this works independently of disrupting the symmetry of the linkage, so the movable contact
There are situations in which the handle does not move from the on position to the off position even if the handle is moved, and in such a case, there is a risk that the user may not be able to grasp the correct situation.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to perform high-speed interruption when a short-circuit current flows, and to remove the handle from the on position at the time of interruption. The present invention provides a circuit breaker that is moved to an off position.

[Disclosure of the Invention] The circuit breaker of the present invention opens both the fixed and movable contacts, and also opens the latch link and trips when the armature swings from the first position to the second position due to a predetermined current flowing through the electrical circuit section. It is characterized by releasing the latch of the link, thereby performing high-speed interruption when a large current such as a short circuit current flows, and at the same time displacing the handle from the on position to the off position at the time of this interruption. It is.

(Example) An example of the present invention will be described below with reference to FIGS. 141 to 3.

A fixed contact 1 is formed by bending a conductive plate and is provided in the middle of a fixed contact plate 3 fixed inside the housing 2. The fixed contact plate 3 has one end extended to the power terminal (not shown) side to become the terminal plate 3a, and the other end extended to the arc extinguishing device 4111J to become the arc travel plate 3b.

Reference numeral 5 denotes a movable contact, which is formed by combining a contact body 6 and a stopper part 7, and has a movable contact 8 that makes contact with and separates from the fixed contact 1 at the tip of the contact body 6. One end 7a of the abutment part 7, which is the base end of the child 5, is pivotally supported by a contact holding plate, which will be described later.

Reference numeral 9 denotes a contact holding plate made of a magnetic material, which has a U-shape when viewed from the side, and has a shape in which the intermediate portions of the opposing side pieces 9a, 9a are cut off from the end faces. A five-shaped piece is connected from the connecting piece 9b that connects the opposing side pieces 9a, 9a, and the end thereof becomes the base end 9c of the contact holding plate 9. The base end portion 9C is rotatably supported by the receiving portion 2a of the housing 2 and serves as a pivot point for the contact holding plate 9. The aforementioned movable contactor 5 has its base end 7a pivotally supported in the shaft hole 9d at its distal end.

Further, the tip end surface 9e elastically contacts an interlocking member 10 that responds to the on/off position of the handle, which will be described later, and furthermore, the end surface of the intermediate portion has a suction surface 9r and an armature receiving portion 9, which will be described later.
g is formed.

Reference numeral 11 denotes an opening spring that elastically biases the contact holding plate Fi9, and is compressed and suspended between the connecting piece 9b of the contact holding plate 9 and the housing 2.

Reference numeral 12 denotes an armature, which is composed of an armature piece 13 made of a magnetic material and a supporting piece 14 having a five-shape shape at a base 14a and a bent portion 14b. The end portion of the base portion 14a becomes the base end portion of the armature 12, and is swingably supported by the receiving portion 9g of the contact holding plate 9. The bent portion 14b is T-shaped when viewed from the front.
The end surface on the side of the base 14a is the pressing portion 1 of the latch link, which will be described later.
It becomes 4c. The end of the armature piece 13 becomes the tip of the armature 12 and extends toward the movable contact 5 side. This armature 12 has an armature piece 13 on a suction surface 9f of the contact holding plate 9.
It swings between a first position in which it is not attracted to this and a second position in which it is attracted to this. The second position is located on both sides of the pivot portion of the movable contact 5 (the center of the shaft hole 9d).

Reference numeral 15 denotes a reversing spring which is compressed and suspended between the other end 7b of the abutment part 7 of the movable contact 5 and the end of the armature piece 13 of the armature 12. Then, it is possible in the opening direction! Spring bias the lJ contactor 5.

Reference numeral t6 denotes an electric circuit section inserted into a space surrounded by the contact holding plate 9 and the armature 12, and connected between the contact main body 6 and a bimetal to be described later. This electric circuit section 16 reliably connects the armature 12 when a predetermined large current such as a short circuit current flows.
A suction force capable of attracting the armature piece 13 to the suction surface 9r of the contact holding plate 9 is applied to the contact holding plate 9.

Reference numeral 17 denotes a frame that guides the above-mentioned interlocking member 10 and connects the central part of the latch link 18 and the rotation fulcrum part 1 of the handle 19.
Supports 9a. Reference numeral 20 denotes a trip link, one end of which is linked to the handle 19, an intermediate portion transmits the on/off position of the handle 19 to the interlocking member IO, and the other end engages with and disengages from the launch link 18. Reference numeral 21 is a bimetal whose base end is fixed to the load side terminal plate 22 and is disposed close to the latch link 18 .

The launch link 1 includes a detection part 18a that responds to heat-induced displacement of the bimetal 21, a latch part 18b that engages and disengages the trip link 20, and an armature engaging part 18C that engages with the pressing part 14G of the armature 12. When the handle 19 is operated from the off position to the on position, the other end of the trip link 20 is engaged with the latch portion 18b of the latch link 18.

A characteristic configuration of the present invention is that the pressing portion 14C of the armature 12
and the armature engaging portion 18C of the latch link 18. That is, when a predetermined current flows through the electric circuit section 16 and an attractive force is generated in the contact holding plate 9 and the armature 12 swings from the first position to the second position, both contacts 1.8 are opened. At the same time, the pressing portion 14c of the armature 12 presses the armature engaging portion 18c of the latch link 18 to rotate the latch link 18, thereby releasing the latch between the latch link 18 and the trip link 20.

(motion) FIG. 3 is a diagram explaining the operation.

Similar to FIG. 1, (a) is in an on (closed) state where a normal current (sufficiently smaller than the predetermined current) flows through the electrical circuit section 16, and the other end of the trip link 20 is connected to the latch section 18b of the launch link 18. are engaged and the armature 12 is in the first position.

When an overcurrent (less than a predetermined current) flows through the electrical circuit section 16 in the state of (a), the bimetal 21 heats up and is displaced.
The detection section 18a of the latch link 18 detects this and responds accordingly. Therefore, the latch link 18 rotates counterclockwise to unlatch the trip link 20, and as shown in (c), the spring force of the opening spring 11 pushes up the contact holding plate 9, that is, the movable contact 5. It becomes an OFF (open circuit) state.

In this case, the handle 19 is displaced to the off position, and the other end of the trip link 20 is placed in the engageable position. Therefore, after bimetal 21 returns, handle 1
If the switch 9 is returned to the on position, the state shown in (a) will be achieved.

When a predetermined current such as a short-circuit current flows through the electric circuit section 16 in the state shown in (a), the suction surface 9f of the contact holding plate 9 attracts the armature piece 13 of the armature 12, as shown in (b). Therefore, the armature 12 swings from the first position to the second position, and the reversing spring 15 biases the movable contact 5 in the opening direction to turn it off (opening).
state.

At the same time, the pressing portion 14c presses the armature engaging portion 18c of the latch link 18 to rotate the latch link 1 in the counterclockwise direction, thereby releasing the latch between the launch link 18 and the trip link 20. Therefore, in this case as well, the state (c) will occur. In addition, just before the contact holding plate 9 and the movable contact 5 reach the maximum push-up position, the movable contact 5 contacts the reset member 23 and resets the armature 12 to the first position. It may also serve as a plate, or it may protrude from the housing 2.

FIG. 4 shows another embodiment of the invention in which the support piece 34 and latch link 38 of the armature 32 are modified. While the previous embodiment is a pull method as seen from the armature 12,
This device is a bush type when viewed from the armature 32, but its operation is the same as in the previous embodiment.

[Effects of the Invention] The circuit breaker of the present invention opens both the fixed and movable contacts and closes the latch link and trips when a predetermined current flows through the electrical circuit section and the armature swings from the first position to the second position. Since the latch of the link is released, it is possible to quickly cut off the gap where a large current such as a short-circuit current flows, and at the same time, it is possible to displace the handle from the on position to the off position at the time of this cutoff. .

[Brief explanation of drawings]

Fig. 1 is a side view with main parts cut away showing an embodiment of the present invention, Fig. 2 is a perspective view of the main parts, and Fig. 3 is an explanatory diagram of its operation, in which (a) is an on state; (b
) is a state in which the armature is in operation, (c) is an off state, and FIG. 4 is a perspective view of a main part showing another embodiment of the present invention. 1-- Fixed contact, 2--Housing, 3-- Fixed contact plate, 5-- Movable contact, 8- Movable contact, 9-- Contact holding plate, 10-- Interlocking member, 11- Opening Spring, 12-・
- Armature, 15 - Reversing spring, 16... Electric circuit section, 1
7... Frame, 18... Latch link, 19-...
・Handle, 20--Trip link, 21-Bimetal. Shima 1 Figure 2 Figure 14

Claims (1)

[Claims] (1) A fixed contact, a movable contact whose distal end is provided with a movable contact that makes contact with and separates from the fixed contact, and a proximal end of the movable contact that is pivoted to the distal end so that the proximal end serves as a rotation fulcrum. A contact holding plate made of a magnetic material and having a tip end face elastically abutting an interlocking member that responds to the on/off position of the handle and a suction surface formed in the middle part, and the contact holding plate. an opening spring elastically biased; a base end swingably supported by the contact holding plate and a distal end extending toward the movable contact; It swings between a first position where no suction is applied and a second position where it is suctioned, and both positions include armatures located on both sides of the pivot portion of the movable contact, and the armature that is compressed and suspended between the movable contact and the armature. A reversing spring biases the movable contact in the closing direction in the first position and in the opening direction in the second position, and a space surrounded by the contact holding plate and the armature, and a predetermined current is passed through the space surrounded by the contact holding plate and the armature. an electric circuit section that applies an attractive force to the contact holding plate when flowing;
The handle includes a latch link that responds to displacement of the bimetal, a trip link that engages and disengages the latch link and is coupled to a handle, and a handle that engages the trip link with the latch link when actuated from the off position to the on position. In the circuit breaker, a predetermined current flows through the electrical circuit section so that the armature is connected to the first
A circuit breaker characterized in that when the circuit breaker swings from one position to a second position, both the contacts are opened and the latches of the latch link and the trip link are released.