JPS635160Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an automatic tripping device for heat-resistant circuits and breakers.

[Conventional technology]

FIG. 4 is a front view showing a conventional automatic tripping device for circuit breakers, and FIG. 5 is a bottom view of FIG. 4.
In FIGS. 4 and 5, when the current flowing through the circuit or the disconnector exceeds the first predetermined value, the heater 4
Due to the heat generation, the main bimetal 1 is bent by a predetermined value or more in the direction of arrow A shown in FIG. When main bimetal 1 bends beyond a predetermined value, main bimetal 1
The adjustment screw 2 of each pole provided at the tip of the main trip bar 7 presses the main trip bar 7. Therefore, the main trip bar 7 rotates about the shafts 9a and 9b in the direction of the arrow D shown in FIG. . When the tip end 10a is disengaged from the latch 11, the latch 11 rotates clockwise in FIG. It comes off. When the roller 13 and the catch 14 are disengaged, the catch 14 rotates about the shaft 15 in the direction of arrow B shown in FIG. The circuit is disconnected and the circuit is disconnected.

Next, when a current equal to or greater than a second predetermined value, which is greater than the first predetermined value, flows through the circuit breaker, the electromagnet 19 is excited and attracts the movable iron core 21 against the pulling force of the spring 20 shown in FIG.
When the rod 22 and the adjustment nut 23 are sucked in,
5, and the main trip bar 7 rotates in the direction of the arrow D shown in FIG. 5, and the circuit breaker is made or broken in the same manner as described above.

[Problem that the invention attempts to solve]

With this conventional automatic tripping device for circuits and disconnectors, when a fire occurs and the outside temperature rises, it is necessary to secure power sources such as lights to facilitate evacuation. However, even if a current below the rated current flows through the circuit or disconnector,
There was an inconvenience that the main bimetal 1 would bend more than a predetermined value and break the circuit.

This invention eliminates the drawbacks of the conventional circuits and includes an automatic tripping device for circuits and disconnectors that prevents the circuits and disconnectors from disconnecting even when the outside temperature is high but the current is below the rated current. The purpose is to provide.

[Means for solving problems]

In the automatic tripping device for circuit breakers and breakers according to this invention, the main trip bar is engaged and pressed via the auxiliary trip bar when the main bimetal is bent, and holds the auxiliary trip bar slidably orthogonally to the direction of engagement and pressing. , an auxiliary bimetal that is always engaged with the end of the auxiliary trip bar in the sliding direction and bends to release the engagement when the outside temperature rises, and a spring that is installed in the sliding direction between the main trip bar and the auxiliary trip bar. It is something that

[Effect]

In this invention, when an overload current flows, the curvature of the main bimetal engages and presses the main trip bar via the auxiliary trip bar, thereby tripping the circuit or disconnector. When the outside temperature rises due to a fire outbreak, etc., the auxiliary trip bar is disengaged due to the curvature of the auxiliary bimetal, and the auxiliary trip bar is slid by the spring force, so that even if the main bimetal is bent, the auxiliary trip bar will not engage. Avoid joint pressure.

〔Example〕

An embodiment of this invention will be described below.

Fig. 1 is a front view showing an embodiment of the automatic tripping device for circuit breakers and breakers according to this invention in normal operation, and Fig. 2 is an auxiliary view of the automatic tripping device for circuit breakers and breakers according to this invention. FIG. 3 is a front view showing one embodiment during bimetal operation, and FIG. 3 is a bottom view of FIG. 1.

In Figures 1 to 3, the main bimetal 1
An adjusting screw 2 is inserted through one end of the holder and is attached by a nut 3. Heater 4
is attached to the other end of the main bimetal 1,
Due to the heat generated by the load current flowing through the heater 4, the main bimetal 1 is bent in the direction of arrow A shown in FIG. The auxiliary trip bar 5 engages with the main bimetal 1 when the main bimetal 1 bends, and is attached to the main trip bar 7 with screws 6. The screw 6 is slidably inserted into the elongated hole 8 of the auxiliary trip bar 5, and
is attached to the main trip bar 7 so as to be slidable in the vertical direction (lateral direction) in FIG. The main trip bar 7 rotates clockwise in FIG. 3 about shafts 9a and 9b when the main bimetal 1 and the auxiliary trip bar 5 are engaged. The latch 10 is provided integrally with the main trip bar 7, and the latch 11 always releases the opening/closing mechanism (not shown) at the tip 10a.
is engaged in. The latch 11 is rotatably supported by a shaft 12, and has a roller 13 attached to its center.The catch 14 is rotatably supported by a shaft 15, and one end has an opening/closing mechanism (see FIG. (not shown), and the other end engages with a roller 13 provided on the latch 11. frame 1
7 is the shaft 9a, 9b, 12, 15 and the roller 13
It also supports the automatic tripping device 18 and connects it to an opening/closing mechanism (not shown). The electromagnet 19 instantaneously attracts the movable iron core 21 against the force of the spring 20 without waiting for the main bimetal 1 to bend when a large current such as a short-circuit current flows through a circuit or disconnector. be. One end of the rod 22 is attached to the movable iron core 21, and the other end is attached to the adjusting nut 23.
It engages with the main trip bar 7 via. One end of the auxiliary bimetal 24 is normally engaged with the lower end of the main trip bar 7 shown in FIG. It is being Intermediate conductor 2
The other end of 5 is connected to the outer conductor 27 at the terminal portion 28 with a bolt 29 . The spring 30 is
It is installed between the auxiliary trip bar 5 and the main trip bar 7 in the sliding direction of the auxiliary trip bar 5.

Next, this operation will be explained. Now, when the current flowing through the circuit or disconnector exceeds the first predetermined value, the heat generated by the heater 4 causes the main bimetal 1 to
It curves in the direction of arrow A shown in the figure by a predetermined value or more.
When the main bimetal 1 bends beyond a predetermined value, the adjustment screw 2 of each pole provided at the tip of the main bimetal 1
presses against the auxiliary trip bar 5. For this reason,
The auxiliary trip bar 5 and the main trip bar 7 rotate about shafts 9a and 9b in the direction of arrow D shown in FIG. come off from When the tip 10a comes off the latch 11,
The latch 11 rotates clockwise in FIG. 3 about the shaft 12, and the roller 13 attached to the latch 11 disengages from the receiver 14. When the roller 13 and the receiver 14 are disengaged, the receiver 14 rotates about the shaft 15 in the direction of arrow B shown in FIG. 3, disengages from the cradle 16, and completes the circuit. The disconnector is quickly disconnected. The above operation is similar to the conventional example shown in FIGS. 4 and 5.

Next, when a current equal to or higher than a second predetermined value, which is larger than the first predetermined value, flows through the circuit or disconnector, the electromagnet 19 is excited and attracts the movable iron core 21 against the tensile force of the spring 20. do. When the movable iron core 21 is attracted, the rod 22 and the adjusting nut 23 are
Move the main trip bar 7 in the direction of arrow O shown in the figure.
is rotated about the shafts 9a and 9b in the direction of arrow D shown in FIG. 3, and the circuit and disconnector are immediately disconnected in the same manner as described above.

Next, when the temperature of the outside air increases due to a fire or the like, the compensating bimetal 24 bends as shown by the dashed line in FIG. For this reason, the auxiliary bimetal 2
From the state where one end of 4 is engaged with the lower end of the auxiliary trip bar 5 shown in FIG. 1, as shown in FIG.
It comes off from the lower end of the auxiliary trip bar 5. Therefore, under the action of the compression spring 30, the auxiliary trip bar 5 moves laterally (downward in FIG. 1) from the main trip bar 7, changing from the state shown in FIG. 1 to the state shown in FIG. Therefore, even if the main bimetal 1 is bent due to the temperature of the outside air, the main bimetal 1 and the auxiliary trip bar 5 will not engage with each other, and the circuit or disconnector will not be disconnected. Even in this case,
When a large current such as a short-circuit current flows through a circuit or a disconnector, the electromagnet 19 is excited and attracts the movable iron core 21, as in the conventional example described above, and the rod 22 and adjustment nut 23 move as shown in FIG. As a result, the main trip bar 7 can be rotated and the circuit or disconnector can be disconnected.

Note that when the temperature of the outside air rises, both the main bimetal 1 and the auxiliary bimetal 24 bend.
Since the auxiliary bimetal 24 is closer to the heat source, it curves faster than the main bimetal 1, and by the time the main bimetal 1 has curved beyond a predetermined angle, the auxiliary trip bar 5 has already moved and the main bimetal 1
does not engage with the auxiliary trip bar 5.

[Effect of idea]

As described above, according to this invention, the trip bar is divided into two parts, the main trip bar 7 and the auxiliary trip bar 5, and when the outside temperature rises, the curvature of the auxiliary bimetal 24 causes the spring force of the spring 30 to Since the auxiliary trip bar 5 is moved so that the main bimetal 1 and the auxiliary trip bar 5 do not engage with each other, electricity can be supplied even in an emergency when the temperature of the outside air increases due to a fire or the like.
In addition, even in such an emergency situation, if a large current such as a short circuit current flows, it is possible to instantly trip the circuit or disconnector to prevent secondary disasters.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the automatic tripping device for circuit breakers and breakers according to this invention in normal operation, and Fig. 2 is an auxiliary view of the automatic tripping device for circuit breakers and breakers according to this invention. 3 is a bottom view of FIG. 1, FIG. 4 is a front view of a conventional automatic tripping device for circuit breakers, and FIG. FIG. 3 is a bottom view of the figure. In the figures, corresponding parts in each figure are given corresponding symbols, and 1 is a main bimetal, 5 is an auxiliary trip bar, 7 is a main trip bar, 9 is an electromagnet, 24 is an auxiliary bimetal, and 30 is a spring.

Claims (1)

[Scope of utility model registration request] A main bimetal that bends when a current of a first predetermined value or more flows, an auxiliary trip bar that engages and presses an end of the main bimetal when the main bimetal bends, and the auxiliary trip bar that is perpendicular to the engagement and pressing direction. a main trip bar held so as to be slidable in the direction; an electromagnet that is excited when a current of at least a second predetermined value larger than the first predetermined value flows to drive the main trip bar in the engagement pressing direction; and an auxiliary trip bar. an auxiliary bimetal that is always engaged with the end in the sliding direction and curves to disengage from the end in the sliding direction when the outside temperature exceeds a predetermined value; and an auxiliary bimetal that is installed between the auxiliary trip bar and the main trip bar Automatic tripping device for circuits and disconnectors equipped with a spring that slides an auxiliary trip bar.