JPS61248327A - Circit 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〕 This invention relates to a circuit breaker.

[Background technology]

Generally, circuit breakers are turned on and off by operating a handle.
In addition to switching off and closing, it also detects overcurrent or short-circuit current in the line, and changes the closed state to the open state by disrupting the symmetry of the link mechanism. However, the response of the link mechanism is slow and, in particular, the short circuit cannot perform high-speed limiting current cutting of the contactor in the event of a short circuit.

In addition, conventional high-speed contact opening mechanisms using tension springs have been available, but these are only effective in areas where the short-circuit current is extremely large, and in the case of small circuit breakers with low rated currents, the short-circuit current is small. Therefore, the electromagnetic repulsion force is small and ineffective. There was also a forced opening mechanism that used an electromagnetic plunger, but it had the disadvantage of a complicated structure.

[Purpose of the invention]

An object of the present invention is to provide a circuit breaker that can increase the opening speed with a simple configuration.

[Disclosure of the invention]

The present invention includes a handle, a contact holder that opens and closes in conjunction with the handle, a movable contact that is pivotally supported by the contact holder and has a movable contact, and a fixed contact that separates from the movable contact. an armature pivotally supported by the contact holder; and an armature provided between the armature and the movable contact to apply contact pressure to the fixed contact to the movable contact when the contact holder is closed. and a reversing spring that opens the movable contact by a reversing action, and a forced opening part that is provided on the armature and presses the movable contact in the opening direction by the reversing action of the armature.
The device includes a yoke that is disposed opposite to the side of the armature that performs a reversing operation, and an electric circuit section that is passed through between the yoke and the armature.

According to this invention, a movable contact and an armature are pivotally supported on a contact holder, a reversing spring is provided between the movable contact and the armature, and the reversing spring applies contact pressure to the movable contact. By attracting the armature to the yoke during a short circuit, the movable contactor is opened by the reversal action of the reversal spring, so the opening speed can be increased with a simple configuration. Furthermore, since the armature is provided with a forced opening section and the movable contact is forcibly opened during the suction operation of the armature, the opening speed can be further increased.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 6. In FIG. 1, reference numeral 1 denotes a fixed contact whose one end is continuous with the power supply terminal 1a, and a fixed contact 2 is brazed to it. Reference numeral 4 denotes a movable contact that brings the fixed contact 2 and the movable contact 3 into contact with each other.

6 is a bimetal which is an overcurrent sensor, and its upper end is connected to the movable contactor 4 by an electric circuit section 5 which is an example of a wire element;
The lower end is connected to the load terminal 7.

A contact pad 8 is fixed to the movable contact 4 with a rivet, a grommet, etc., and suspends one end of a reversing spring 16, which is a compression coil spring, together with the bearing of the movable contact 4.

9 is a known opening/closing mechanism A (for example, Japanese Patent Application No. 55-0271
The contact holder is made of a magnetic material and has a U-shaped cross section, and is pivotally supported by the fixed shaft 14, as well as by the contact rotation shaft 1.
3, the movable contactor 4 is pivotally supported, and the armature 11 is pivotally supported on the fixed shaft 14. The contact rotary shaft 13 is prevented from being removed by an E-ring. This armature 11
is composed of an armature side plate 11a made of a non-magnetic material and an armature bottom plate 11b made of a magnetic material. The notch B11c of the portion is engaged with the fixed shaft 14. Further, the armature bottom plate 11b is located so as to cover the upper opening side of the middle part of the contact holder 9, and the part of the contact holder 9 that faces the armature llb is formed into a yoke having a U-shaped cross section as shown in FIG. 9a, and the electric circuit portion 5 passes through between the yoke 9a and the armature bottom plate 11b. Furthermore, a forced opening portion lid formed of a magnetic material on the armature bottom plate 11b
is screwed, and its tip is opposed to the rear side of the movable contactor 40 with respect to the shaft 13. This forced opening part lid presses the movable contact 4 by the reversal action of the armature 11 to open the contact, but preferably when the contact pressure of the movable contact 4 is zero or It is desirable to press the movable contact 4 a little later than that.
Reference numeral 10 denotes a holder that pivotally supports the contactor holder 9 via a fixed shaft 14, and is fixed to the bottom surface of the instrument stand 17. Reference numeral 15 designates an opening spring suspended between the holder 10 and the contactor holder 9, 18 a cover, and 19 an arc extinguisher.

To outline the opening/closing mechanism A, as shown in FIG. The supported handle includes a latch link 22 which is supported by a fixed shaft 22a and faces the moving mechanism 6a of the overcurrent sensor 6, and 23 which has one end supported by the first slit 26 of the frame 20 and which is connected to the handle 21 by a shaft 29. A handle link 24 is connected to a shaft 28 at the one end of the handle link 23.
The tip portion 24a is connected to the latch link 22 by
The trip link 25 latched is a drive element supported by the second slit 27 of the frame 20 and interposed between the contact holder 9 and the trip link 24.

3 and 4 show the operating state of the movable contactor 4,
+a+ in the figure is in the on state. That is, the contact holder 9 is in the closed state by the opening/closing mechanism part A, and at this time, the movable contact 4 is biased toward the fixed contact 1 by the reversing spring 16, and the movable contact 3 is closed. contact pressure is applied to the fixed contact 2. In this case, if a stopper for positioning the armature 11 is provided on the contact holder 9, the contact pressure of the movable contact 3 can be more easily stabilized. Since the magnetic flux Q shown by the arrow flows through the yoke 9a and the armature bottom plate 111) that surround the electric circuit section 5, the armature bottom plate 11b and the yoke 9
The armature bottom plate 11b is attracted against the force of the reversing spring 16 in a direction that narrows the gear 2 valve Z between the armature and the armature. The connecting side of the reversing spring 16 of the armature bottom plate 11b is the shaft 13.
, the contact pressure of the movable contact 3 becomes zero. Further, at this time, the forced opening portion lid comes into contact with the movable contactor 4. Fourth
The figure fat shows a state in which the armature bottom plate 11b is further attracted and adsorbed to the yoke 9a, and at this time the forced opening portion li
d, the movable contact 4 is driven to open and the reversal spring 16
The reversal operation causes the movable contact 4 to perform an opening operation. Furthermore, at this time, the electromagnetic repulsion force generated between the movable contact 4 and the fixed contact 1 contributes to the opening operation of the movable contact 4. Further, due to the opening, the current in the electric circuit section 5 is stopped and the attractive force of the yoke 9a is lost, but the same open state is maintained by the holding force of the reversing spring 16. In the same figure (bl is the reset state, when the opening/closing mechanism is turned off, the contact holder 9 is opened by the spring 15, and the free end of the movable contact 4 is pushed by the stopper 28 provided on the device stand 17. Therefore, it rotates from the state shown by the imaginary line to the state shown by the solid line, and the reversing spring 16 performs a reversing operation to return to its original state.In this way, the opening operation in the event of a short-circuit accident can be achieved at high speed and with a simple configuration.Especially Since the movable contact 4 is opened by the forced opening part lid, the opening speed can be increased, and if the movable contact 4 and the fixed contact 1 are opposed to each other to generate a larger electromagnetic repulsion force, the opening speed can be further increased. can be converted into

Fig. 6 fa+ shows the opening/closing mechanism A in the ON state, and Fig. 6 (BL shows the OFF state. In the OFF state, the handle 21
When the handle link 23 slides on the first slit 26 and moves upward, the spring 15 causes the contact holder 9 to open. Same figure (
C1 is a trip operation state when an overcurrent flows, and the launch link 22 is pushed by the overcurrent sensor 6 and rotates counterclockwise around the fixed shaft 22a, so the trip link 2
4 and the latch link 22 are released, the trip link 24 rotates around the hand link side connecting shaft 2, and the driver 25 moves up the second slit 27 and is opened by the spring 15. In addition, the reset is performed by turning off the handle 21 as shown in FIG. 2B, so that the reset protrusion 21b of the handle 21 pushes down the tip of the trip link 24 and locks it to the launch link 22.

A second embodiment of the invention is shown in FIG. That is, the forced opening part lid is integrally formed on the armature bottom plate 11a by cutting and bending, which reduces the number of parts and the weight.

A third embodiment of the invention is shown in FIGS. 8 and 9.
That is, the forced opening portion 11d is connected to the armature bottom plate 11a.
It is made to protrude integrally by punching out, and has the same effect as the second embodiment.

〔Effect of the invention〕

According to this invention, a movable contact and an armature are pivotally supported on a contact holder, a reversing spring is provided between the movable contact and the armature, and the reversing spring applies contact pressure to the movable contact. By attracting the armature to the yoke during a short circuit, the movable contactor is opened by the reversal action of the reversal spring, so the opening speed can be increased with a simple configuration. Furthermore, since the armature is provided with a forced opening section and the movable contact is forcibly opened during the suction operation of the armature, the opening speed can be further increased.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention, FIG. 2 is a sectional view showing the relationship between the armature and yoke, FIGS. 3 and 4 are explanatory diagrams of the operating state of the movable contact device, Fifth
The figure is a perspective view of the armature bottom plate, FIG. 6 is an explanatory diagram of the operating state of the circuit breaker, FIG. 7 is a perspective view of the armature bottom plate of the second embodiment, and FIG. 8 is the armature bottom plate of the third embodiment. FIG. 9 is a perspective view and a cross-sectional view thereof. 2... Fixed contact, 3... Movable contact, 4... Movable contact, 5... Electric circuit section, 9... Contact holder, 9a.
... Yoke, 11 ... Armature, lid ... Forced opening part, 16 ... Reversing spring, 21 ... Handle Fig. 2 Fig. 3 2 ... Fixed contact 9a ... Yaw 7
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Claims (2)

[Claims] (1) a handle, a contact holder that opens and closes in conjunction with the handle, a movable contact that is pivotally supported by the contact holder and has a movable contact, a fixed contact that separates from the movable contact; an armature pivotally supported by a contact holder; and an armature provided between the armature and the movable contact to apply contact pressure to the fixed contact to the movable contact when the contact holder is closed. a reversing spring that opens the movable contact by a reversing action; a forced opening portion provided on the armature that presses the movable contact in the opening direction by the reversing action of the armature; and a reversing spring of the armature. 1. A circuit breaker comprising: a yoke disposed to face each other on opposite sides; and an electric circuit section extending between the yoke and the armature. (2) The circuit breaker according to claim (1), wherein the forced opening portion is integrally formed with the armature.