JP2500498Y2 - Breaker with electromagnetic tripping mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention is an electromagnetic induction device capable of controlling a breaker, which detects an overcurrent and opens a contact inserted in an electric circuit, by an external control voltage. The present invention relates to a breaker with a removal mechanism.

[Prior Art] Conventionally, a breaker with an electromagnetic tripping mechanism that can control a breaker, which is configured to open a contact inserted in an electric circuit by detecting an overcurrent, by an external suppression voltage An abnormal current detection device that opens the contact device for breaking the circuit by detecting and destroying the equilibrium state of the trip device, and a control voltage applied to the external control terminal to excite the trip device to force the equilibrium state of the trip device. It consisted of a collapsing electromagnet device. By the way, in a breaker equipped with such an electromagnetic trip mechanism,
If an external control voltage is continuously applied to the exciting coil of the electromagnet device, the exciting coil will be burned.Therefore, insert a micro switch that is turned off when the contact is opened in series with the exciting coil to continuously energize the exciting coil. I was supposed to prevent being.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, since the micro switch is used as the auxiliary switch for exciting the current for preventing the burning of the exciting coil, the cost increases and There is a problem that the structure cannot be integrated and integrated in the electromagnet device and the configuration becomes complicated.

The present invention has been made in view of the above points, and an object of the present invention is to provide a breaker with an electromagnetic tripping mechanism that is low in cost, has a simple structure, and is easy to assemble.

[Means for Solving the Problem] The breaker with an electromagnetic tripping mechanism of the present invention detects an abnormal current in an electric circuit and collapses the equilibrium state of a trip device to detect an abnormal current for opening a contact device for breaking an electric circuit. A device, a coil excited by a control voltage applied to an external control terminal, and a plunger that can be moved back and forth in the coil are provided. By energizing the coil, the plunger is pulled in to force the equilibrium state of the trip device. In a breaker with an electromagnetic tripping mechanism equipped with an electromagnet device that disintegrates into a movable state, the breaker is provided with an opening for inserting a plunger so as to be movable back and forth in a direction orthogonal to the moving direction of the plunger, and is movable in conjunction with a contact opening member of a trip device. Closed contacts of the circuit for closing the electric path by the frame, the movable contact driven by the movable frame, and the fixed contact that is elastically contacted with the movable contact. An auxiliary contact that is turned on at some time and turned off when the contact for breaking the electric path is opened is incorporated in the electromagnet device, and the auxiliary contact is connected in series to the exciting coil of the electromagnet device.

[Operation] The present invention is configured as described above, and the breaker body that detects an abnormal current and operates the trip device to open the contact device is excited by an external control voltage to forcibly open the contact device. In a breaker with an electromagnetic tripping mechanism to which an electromagnet device for polarizing is added, a movable frame which is incorporated in the electromagnet device and interlocks with a contact opening member of a trip device, a movable contactor driven by the movable frame, and a movable contactor. Since the auxiliary contact is formed with the fixed contact that is elastically contacted with, and the micro switch is not used, the cost can be reduced, and the auxiliary contact constituent member is incorporated in the electromagnet device. Therefore, the structure is simple and the assembly is easy.

[Embodiment] FIGS. 1 to 9 show an embodiment of the present invention.
FIG. 1 shows the overall configuration of the present invention, in which a container 10 is made of synthetic resin and has a rectangular parallelepiped shape. Three power source side terminals 11 and three load side terminals 12 are arranged at both longitudinal ends of the body 10, and each power source side terminal 11 and each load side terminal 12 are arranged.
The contact device 20 is inserted in each of the electric paths between and, and it has three poles. In addition to the contact device 20, the contact device 20 is opened in the body 10 by detecting an abnormal current (short-circuit current, overcurrent, etc.) in the electric path and breaking the equilibrium state of the trip device 50. Abnormal current detection device 30
And an electromagnet device 40 that is excited by a control voltage applied to an external control terminal 41 provided on the side surface of the body 10 to forcibly collapse the equilibrium state of the trip device 50.

The contact device 20 includes a fixed contact 22 fixed at a fixed position in the body 10 and having a fixed contact 21 at a central portion of an upper surface, a movable contact 24 having a movable contact 23 separated from and fixed to the fixed contact 21, An arc-extinguishing yoke 25 made of a magnetic material and extinguishing an arc generated between the fixed contact 21 and the movable contact 23 when the contact device 20 is opened.
It has. The right end of the fixed contact 22 is connected to the load terminal 12 disposed on the left side of the fixed contact 22 via an arc-extinguishing coil 26. The arc-extinguishing coil 26 is formed in a substantially U-shape that is opened downward, and the pair of arc-extinguishing coils 26 are arranged so as to face each other with the fixed contact 21 interposed therebetween. At times, the magnetic field generated around the arc extinguishing coil 26 and the electromagnetic force acting between the current flowing through the movable contact 24 and the arc current accelerate the opening of the contact device 20 and extend the arc. It is like this. The movable contact 24 has a contact holding portion 28 of the cross bar 27 on the base side.
The movable contact 24 is inserted in the contact holder 28.
A suitable position is rotatably supported, and a contact pressure spring 29 is arranged in the contact holder 28. The crossbar 27 is arranged so as to straddle the movable contact 24 of three poles, and is shown in FIG.
It is rotatable about an axis perpendicular to the plane of the paper. Here, the fulcrum of the movable contactor 24 with respect to the contactor holding portion 28 and the rotation axis of the crossbar 27 are provided at positions different from each other, and in FIG. The one is located on the right side. Further, when the contact device 20 is opened and the movable contact 24 is rotated around the shaft fulcrum (clockwise in FIG. 1A), the crossbar 27 is also rotated in the same direction around the rotation shaft. When the contact device 20 of one pole is opened, the contact device 20 of the other pole is also opened via the crossbar 27.

The abnormal current detection device 30 is composed of an electromagnetic motion device 30a that detects a short-circuit current and a thermal motion device 30b that detects an overcurrent, and the electromagnetic motion device 30a includes a plunger 31 made of a magnetic body that is vertically movable. The plunger 31 is urged upward by a return spring 32. Further, a hooking pin 31a is projectingly provided at the tip (upper end) of the plunger 31,
Is inserted into a coil 33 formed by bending a sheet metal. One end of the coil 33 is connected to the internal terminal 13 and the coil 33
A thermodynamic device 30b is fixed by caulking to the other end of 33. The thermodynamic device 30b has a heater plate 34 and a bimetal plate 35 whose lower ends are fixed to one end of a coil 33 by caulking and is opposed to each other, and a pressing screw 36 is provided at the upper end of the bimetal plate 35. The other end of a connection line 37 made of a braided wire and having one end connected to the movable contact 24 is connected to the upper end of the plate 34. As described above, the coil 33, the heater plate 34, the connection wire 37, the movable contact 2
4. An electric path is formed through the fixed contact 31. Therefore, when a short circuit current flows in this electric path, the plunger 31 is pulled downward against the spring force of the return spring 32, and when an overcurrent flows in this electric path, the bimetal plate 35 causes the heater plate
When heated by 34, the upper end of the bimetal plate 35 is bent to the left in FIG.

The electromagnet device 40 includes a cylindrical exciting coil 43 wound around the coil winding portion 42a of the holding frame 42 and excited by a control voltage applied to the external control terminal 41, and a leg arranged so as to surround the exciting coil 43. One end is inserted into the inner hole of the exciting coil 43 through the plunger inserting hole 44a, and the actuator portion is provided at the other end, and the U-shaped yoke 44 is formed with a plunger inserting hole 44a corresponding to the inner hole of the exciting coil 43. It is composed of a plunger 45 having a 45a formed therein and a return spring 46 for biasing the plunger 45 in the protruding direction.When an exciting current flows through the exciting coil 43, the plunger 45 is drawn into the exciting coil 43. The actuator unit 45a is used to collapse the equilibrium state of the trip device 50 described later.

On the other hand, the auxiliary contact 49 connected in series with the exciting coil 43,
A movable frame that is incorporated in the electromagnet device 40 and that interlocks with the contact holding portion 28 of the crossbar 27 that is the contact opening member of the trip device 50.
46, one end is fixed to the holding frame 42 and the rib 10a protruding from the body 10 is brought into contact with the central portion of the movable frame 46.
The movable contact 47 is driven by the drive protrusion 46a, and the fixed contact 48 is provided at the free end of the movable contact 47 so as to be elastically contactable. The auxiliary contact 49 is turned on when the contact is closed and turned off when the contact is opened so that the exciting coil 43 is prevented from being overheated or burned due to continuous energization of the exciting coil 43. . In addition, movable frame
The opening 46b for inserting the plunger is provided in the central portion of the 46, and can be moved up and down without hitting the plunger 45 when the contact holding portion 28 of the crossbar 27 is rotated.

The trip device 50 is configured to interlock with the abnormal current detection device 30 and the electromagnet device 40 via the interlocking bar 51, and is configured to hold a large number of links 52a to 52f and springs 53a and 53b in the frame 54. ing. The interlock bar 51 is engaged with the link 52a, and operates the link 52a by rotating counterclockwise in FIG. 1A. The interlocking bar 51 is engaged with a hooking pin 31a provided on the electromagnetic actuator 30a, and when the plunger 31 moves downward, the interlocking bar 51 rotates counterclockwise. In addition, a pressing plate 51a and a tripping plate 51b are provided on the peripheral surface of the interlocking bar 51 so as to project, and are pressed by the pressing screw 36 of the thermal device 30b or the plunger 4.
The interlocking bar can also be pulled by the 6 hook pins 46b.
51 is designed to rotate counterclockwise. Therefore,
In any case, the plunger 31 is operated by a short-circuit current, the bimetal plate 35 is bent by an overcurrent, or the electromagnet device 40 is excited by the application of an external control voltage to pull the plunger 45. Rotates to operate the link 52a. Link with link 52d
The connecting portion of 52e is connected to a link 52f via a spring 53b, and the link 52f is connected to a handle 16 protruding from the upper surface of the body 10. In addition, the link 52e is the movable contact 2
Combined with 4.

However, when the handle 16 is tilted to the left in FIG. 1A, the movable contact 24 moves so as to close the contact device 20 due to the relationship between the links 52a to 52f and the springs 53a and 53b. The forces in the directions for opening the contact device 20 are accumulated in the springs 53a and 53b, and the equilibrium state is maintained by the engagement relationship of the links 52a to 52f. On the other hand, when any one of a short circuit current, an overcurrent, and a leakage current flows in the electric path and the interlocking bar 51 rotates counterclockwise in FIG. 1 (a), the engagement relationship between the links 52a to 52f collapses. The force accumulated in the springs 53a and 53b is released, and the contact device 20 is momentarily opened. As described above, when the contact device 20 is opened, the handle 16 is tilted to the right side in FIG. 1 (a), and the contact device 20 is opened.
It will be visible depending on the position of the handle 16.

8 and 9 show an electromagnet device 40 and auxiliary contacts.
Fig. 8 shows the operation of Fig. 8. Fig. 8 shows that when the trip device 50 is not operating, the contact device 20 is in the closed state, and the auxiliary contact 49 is on, Fig. 9 shows that the electromagnet device 40 is excited. The trip device 50 operates, the contact device 20 is opened, and the auxiliary contact 49 is turned off.

Now, in a normal case where no abnormal current is flowing in the electric path and the control voltage is not applied to the external control terminal 41, the electromagnet device 40 has the plunger 45 from the exciting coil 43 as shown in FIG. In the protruding state, the trip device 50 is in equilibrium while accumulating the force in the contact opening direction. In this state, the movable frame 46 engaged with the contact holding portion 28 of the crossbar 27 is located below, and the movable contact 47 makes elastic contact with the fixed contact 48 and the auxiliary contact.
49 is on. When a control voltage is applied to the external control terminal 41 and an exciting current flows through the exciting coil 43 of the electromagnet device 40, as shown in FIG.
45 is pulled into the exciting coil 43 and the actuator 45a
As a result, the pressing plate 51a of the interlocking bar 51 of the trip device 50 is pressed, the equilibrium state of the trip device 50 collapses, and the contact device 20
Are driven in the opening direction. At this time, the movable frame 46 is pushed up by the contact holding portion 28 of the crossbar 27, and the movable contact 47 is flipped up by the drive piece 46b and separated from the fixed contact 48. When the auxiliary contact 49 is turned off in this manner, the exciting current flowing in the exciting coil 43 is cut off, and even if the control voltage is continuously applied to the external control terminal 41, the exciting coil 43 is briefly turned on. Since it is only energized, the exciting coil 43 does not overheat or burn.

Further, unlike the conventional example, the auxiliary contact 49 is formed without using the micro switch, so that the cost can be reduced, and moreover, since the member constituting the auxiliary contact 49 is incorporated in the electromagnet device 40. Thus, a breaker with an electromagnetic tripping mechanism that has a simple structure and is easy to assemble can be obtained.

[Advantages of the Invention] As described above, the present invention applies an abnormal current detection device for detecting an abnormal current in a circuit and breaking the equilibrium state of the trip device to open the circuit breaker contact, and an external control terminal. An electromagnet device having a coil excited by a control voltage and a plunger disposed in the coil so as to be able to advance and retreat, and pulling the plunger by exciting the coil to forcibly collapse the equilibrium state of the trip device. In the breaker with an electromagnetic tripping mechanism described above, a movable frame that has an opening for inserting the plunger and is arranged so as to be movable back and forth in a direction orthogonal to the forward and backward direction of the plunger, and the movable frame that interlocks with the contact opening member of the trip device, The movable contact that is driven and the fixed contact that is elastically contacted with the movable contact turn on when the contact for disconnecting the electric path is closed, and contact when opening the contact for disconnecting the electric path. The auxiliary contact that is turned off is formed, and this auxiliary contact is incorporated in the electromagnet device, and the auxiliary contact is connected in series to the exciting coil of the electromagnet device.Because an expensive micro switch is not used as the auxiliary contact, the cost is reduced. In addition, since the auxiliary contact constituent members are incorporated in the electromagnet device, the structure is simple and the assembly is easy, and the moving distance of the movable frame can be absorbed by the electromagnet device. It is not necessary to secure a space for moving the movable frame in the advancing / retreating direction, and the auxiliary contacts can be compactly housed in the electromagnet device.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of one embodiment of the present invention, and FIG. 1 (b).
Is a partially cutaway top view of the same, FIG. 2 to FIG. 4 are exploded perspective views of essential parts of the same, FIG. 5 is a top view of essential parts of the same, and FIGS. 6 and 7 are side views of essential parts of the same. , FIG. 8 and FIG. 9 are diagrams for explaining the operation of the same as above. 10 is a body, 20 is a contact device, 30 is an abnormal current detection device, 40 is an electromagnet device, 41 is an external control terminal, 45 is a plunger, 46 is a movable frame, 47 is a movable contactor, 48 is a fixed contactor, 49 Is an auxiliary contact and 50 is a trip device.

Continuation of the front page (56) References JP-A-62-47928 (JP, A) Actually opened 59-86643 (JP, U) Actually opened 58-6362 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. An abnormal current detector for detecting an abnormal current in an electric circuit to break the equilibrium state of a trip device to open a contact device for breaking an electric circuit, and an excitation current generated by a control voltage applied to an external control terminal. Breaker with an electromagnetic tripping mechanism, which includes a coil and a plunger that can be moved back and forth in the coil, and that pulls the plunger by exciting the coil to forcibly collapse the equilibrium state of the trip device. A movable frame that has an opening for inserting the plunger and is arranged to move forward and backward in a direction orthogonal to the forward and backward directions of the plunger and that interlocks with a contact opening member of the trip device; and a movable contactor that is driven by the movable frame. , And the fixed contact that is elastically attached to the movable contact form an auxiliary contact that is turned on when the contact for circuit breakage is closed and turned off when the contact for circuit break is opened. Rutotomoni incorporate the auxiliary contact to the electromagnetic device, mechanism-equipped breaker disconnect solenoid pull, characterized in that connected in series to the exciting coil of the auxiliary contact electromagnetic device.