JPS6136052Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a bimetal detection actuator for circuits and breakers.

Circuits and breakers to which a bimetal detection actuator is applied, which is the basis of this invention, are shown in FIGS. 1 to 6. In the figure, 1 is the table, 2 is the cover,
3 is a power supply side terminal device, 4 is a load side terminal device, 5 is a fixed contact, 6 is a movable contact, 7 is a movable contact, 8 is a short circuit detection sensor, 9 is an arc extinguishing device, 10 is a mechanical frame, 11 is a latch link , 12 is the handle, 1
3 is an actuator, 14 is a support plate, 15 is a bimetal,
16 is a tripping link. In this circuit breaker, when the latch link 11 is latched to the trip link 16 and the handle 12 is turned on as shown in FIG. The electric circuit is then closed.
FIG. 5B shows an off state, and when the handle 12 is turned off (tilted to the left in the figure), the movable contact 7 is opened. Next, when an overcurrent flows between the power supply side terminal device 3 and the load side terminal device 4, the bimetal 15 is self-heated and bends, as shown in Figs. 3 and 4c, and the actuator 13 rotates. The tripping link 16 is tripped by moving the tripping link 16. Further, when a short circuit current flows in the electric circuit, the short circuit sensor 8 is activated instantaneously as shown in FIGS. 2 and 4 d, and the trip link 16 is forcibly opened and tripped. Tripping link 16
When the is tripped, the latch link 11 rotates around the support shaft 12a of the handle 12 by the action of the return spring 20, the movable contact 7 is opened, and the electric circuit is tripped and disconnected, and the movable shaft 19 is engaged with the protrusion 22 of the window hole 21 of the mechanical frame 10, and a trip display is performed in which the handle 12 is placed in a neutral position.

By the way, the details of the overcurrent detection section are as shown in FIGS. 5 and 6. A hanging piece 24 is provided on the terminal plate 23 of the load side terminal device 4, and a supporting plate 1 is attached to one side edge of the hanging piece 24.
4 and caulk the lower end of the hanging piece 24.
The lower end of the bimetal 15 is fixed to the overhang piece 25 by bending the overhang piece 25 at the lower end of the support plate 14.
Attach the support pin 26 to the upper end of the support pin 26.
The actuator 13 is rotatably attached to the actuator 13, and a reversing spring 27 is interposed therebetween. The actuator 13 includes a tripping link lifting part 28, a reset protrusion 29 that engages with the handle 12, a latch fitting 30 that comes into elastic contact with the operating end surface of the bimetal 15, and a rotation save part that restricts the maximum rotation amount of the actuator 13. 31. When the handle 12 is in the ON state, as shown in FIGS. 1 and 2, the reversing spring 27 causes the latch fitting 30 to come into elastic contact with the operating end surface of the bimetal 15, resulting in an overcurrent flowing through the bimetal 15. When the operating end bends and the bimetal 15 comes off the latch fitting 30, the actuator 13
is rotated by the action of the reversing spring 27, and the rotation saving part 31 is locked to the support plate 14, as shown in FIGS. 3 and 4.
It stops at the position shown in Fig.
1 is released. Next, when resetting, by tilting the handle 12 in the OFF direction, the handle 12 pushes the reset protrusion 29 to rotate the actuator 13 in the original direction, and the latch fitting 30 is locked to the operating end of the bimetal 15. .

However, this actuator 13 is
As shown in FIG.
When the tip of the bimetal 15 hits, a force exceeding the stress limit is applied to the bimetal 15, making the overcurrent characteristics unstable. As a countermeasure to this problem, the rotation range of the latch fitting 30 can be increased, but the reset protrusion 2
A problem arises in that space is required for the raised part 9 and the raised part 28. Further, at the time of resetting, the stress of the bimetal 15 is applied to the actuator 13, so a very large resetting force is required, making it difficult to operate.

Therefore, an object of this invention is to provide a bimetal detection actuator that does not require a large space, does not impose an excessive load on the bimetal, and can be reset easily.

An embodiment of this invention is shown in FIGS. 7 to 12. In other words, this bimetallic detection actuator is
In the one shown in FIGS. 1 to 6, a latch plate 33 is hinged to the actuator body 32. First, a hanging portion 34 is formed in the actuator main body 32, and a bearing hole 35 is formed in the hanging portion 34. A shaft portion 36 extends from the side of the rear end of the latch plate 33 and is rotatably fitted into the bearing hole 35. Actuator body 32
A support shaft 37 is protruded from the side of the torsion coil spring 38, and one end of the support shaft 37 is engaged with the latch plate 33, and the other end is engaged with the actuator main body 32, thereby locking the latch plate 33. It is supported in a horizontal state in contact with the lower surface of the actuator body 32, and the rotation direction of the actuator body 32 by the reversing spring 27 and the rotation direction of the latch plate 33 against the torsion coil spring 38 are made to be the same direction. The other parts are the same as those in FIGS. 1 to 6, so the same parts are given the same reference numerals.

9 to 12 show the operating state. First, FIG. 9 shows the set state, in which the latch plate 32 is engaged with the operating end surface of the bimetal 15, and the reversing spring 27 is in a biased state. FIG. 10 shows the operating state of the bimetal 15. When the bimetal 15 is removed from the latch plate 33, the actuator main body 32 is rotated in a predetermined manner by the reversing spring 27. When the bimetal 15 returns to its original state by cooling while the rotation is stopped, the latch plate 33
is pushed by the bimetal 15 and rotates as shown by arrow a, so that no excessive stress is applied to the bimetal 15. 11 and 12 show the reset process of the actuator main body 32. When the actuator main body 32 rotates clockwise, the latch plate 33 comes into contact with the bimetal 15 and moves in a rotating state, and the latch plate 33 comes into contact with the bimetal 15 and rotates. When the plate 33 separates from the bimetal 15, it is returned to its original state by the torsion coil spring 38, and when the handle 12 is turned off, the actuator main body 32 is rotated by the reversal spring 27, and the latch plate 33 comes into elastic contact with the operating end surface of the bimetal 15 to be in the set state. becomes. As a result, no bimetallic stress is applied during the reset operation, making the operation easier.

As described above, in the bimetal detection actuator of this invention, the latch plate is pivotally supported on the actuator body and brought into contact with the rotation side surface of the actuator body by the spring, so there is no excessive force on the bimetal when tripping. Since no stress is applied, overcurrent characteristics are stabilized, and operability during reset is improved.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a circuit breaker to which a bimetallic detection actuator is applied, which is the basis of this invention, Figures 2 and 3 are side views of the main parts in a trip state, and Figure 4
The figure is an operation diagram, and Figure 5 is a perspective view of the overcurrent detection section.
FIG. 6 is an exploded perspective view of the device, FIG. 7 is a partial perspective view of an embodiment of the invention, FIG. 8 is a side view, and FIGS. 9 to 12 are side views of essential parts in an operating state. 15...Bimetal, 27...Reversal spring, 32
... Actuator main body, 33 ... Latch plate, 36 ... Shaft portion, 38 ... Torsion coil spring.

Claims (1)

[Scope of utility model registration request] A tripping actuator body is biased to rotate in one direction by a spring, and the base end is pivotally supported on the rotation direction side of the actuator body, and the distal end is perpendicular to the rotation direction of the actuator body. a latch plate that protrudes in the same direction, and a spring that brings the latch plate into contact with the surface of the actuator main body in the rotation direction, and the tip of the latch plate is moved from the high expansion side of the bimetal to the actuation side of the bimetal. A bimetallic detection actuator which is locked in a latched state by the action of a spring that biases the actuator main body to rotate on an end face.