JPH0138338B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a composite type circuit breaker and an electromagnetic switch installed in a power distribution board, distribution board, etc., which combines a circuit breaker and an electromagnetic switch. The switchboard industry is located at the end of the distribution system and is susceptible to upstream competition for orders.
Therefore, in order to overcome the competitiveness among switchboard manufacturers, quality and price have become the most important weapons. In order to meet the above requirements, the present invention eliminates the redundant functions of an electromagnetic switch and a circuit breaker, and provides a compact and inexpensive composite circuit breaker that combines the functions of both. The purpose is to The present invention will be explained below with reference to embodiments shown in the drawings. FIG. 1 is a side sectional view showing a closed state of an embodiment of a composite type circuit breaker according to the present invention. 1st
In the figure, a molded case 1 constitutes the frame of a composite circuit breaker. The base of the fixed contact conductive board 2 is attached to a portion 1a inside the molded case 1. The fixed contact 3 is attached to the tip of the fixed contact conductive plate 2 which is bent into a U-shape. The movable contact 4 is attached to one end of the movable contact conductive plate 5 opposite to the fixed contact 3.
The cross bar 6 is slidably installed between an inner wall 1b of the molded case 1 and a back surface 14a of a lever 14, which will be described later. The first compression spring 7 is installed between the recess 1c of the molded case 1 and the lower end of the cross bar 6, and pushes the cross bar 6 upward.
The shaft 8 rotatably supports the middle portion of the movable contact conductive plate 5 on the lower end portion of the cross bar 6. The manual handle 9 is rotatably supported on a fixed frame (not shown) by a shaft 10, and an operating portion 9a protrudes to the outside from a square hole 1d of the molded case 1. One end of the link 11 is rotatably attached to the inner tip of the manual handle 9 by a pin 12.
The roller 13 is rotatably attached to the other end of the link 11 and comes into contact with an inclined surface 6a provided on the upper end surface of the cross bar 6 and a back surface 14a of a lever 14, which will be described later. One end of the lever 14 is rotatably supported on a fixed frame (not shown) by a shaft 15. The middle part of the trip lever 16 is a shaft 17
is rotatably supported by a fixed frame (not shown), one end of which is engaged with the other free end of the lever 14, and a through hole 16a is bored in the other end. There is. The yoke 18 is formed into a U-shape, and a cylindrical electromagnetic tripping coil 19 is installed inside the U-shape. The movable iron core 20 is an electromagnetic tripping coil 19
It is slidably inserted into a hollow portion and a through hole 181 formed in the U-shaped side 18a of the yoke 18, and is attracted downward when the electromagnetic tripping coil 19 is energized. One end of the protruding shaft 21 is attached to the lower end surface of the movable iron core 20, and the other end is slidably inserted into a through hole 182 bored in the other U-shaped side 18b of the yoke 18. The trip pin 22 is slidably inserted into the through hole 16a of the trip lever 16, and one end thereof is connected to the movable iron core 20.
The engagement piece 23 is attached to the upper end surface of the
is installed. The flexible conductor 24 is connected between the movable contact conductive plate 5 and the electromagnetic tripping coil 19. The second compression spring 25 is mounted between the other end 5a of the movable contact conductive plate 5 and the bent portion 18c of the U-shaped other side 18b of the yoke 18. The electromagnet device 26 includes a yoke 27 attached to a portion 1e of the molded case 1, a cylindrical charging electromagnetic coil 28 installed in the yoke 27, and a hollow portion of the charging electromagnetic coil 28 with one end 29a. A shaft 30 is slidably inserted through and through the through hole 27a of the yoke 27, and is attached to the crossbar 6 at the intermediate portion.
is slidably inserted into the longitudinally long elongated hole 29b.
It is comprised of a movable core 29 whose other end 29c is installed opposite to one end of the trip lever 16, and a release spring 31 that constantly presses the movable core 29 in the direction of release. Micro switch 32
is closed when the operation button 32a is engaged with the other end of the trip lever 16. The control signal input terminals 33a and 33b are connected to the closing electromagnetic coil 28 via the micro switch 32. Next, this operation will be explained using FIGS. 2 to 5. Now, the on-state of the composite breaker shown in Fig. 1,
That is, when voltage is applied to the closing electromagnetic coil 28 and the movable core 29 is attracted to the electromagnetic device 26, the upper end surface of the elongated hole 29b of the movable core 29 engages with the pin 30, and the composite Holds disconnector in position. Therefore, the movable contact 4 contacts the fixed contact 3, and the circuit current flows through the fixed contact conductive plate 2.
→ Fixed contact 3 → Movable contact 4 → Flexible conductor 24
→Flows into the electromagnetic tripping coil 19. In this state, when the voltage applied to the control signal input terminals 33a and 33b is removed and the voltage applied to the closing electromagnetic coil 28 is made non-voltage, the movable iron core 29 releases the release spring 31.
released by the spring force. As a result, the movable core 29 moves upward with the elongated hole 29b guided by the shaft 30, and the other end 29c of the movable core 29 presses one end of the trip lever 16 upward. Therefore, the trip lever 16 rotates clockwise about the shaft 17 to disengage one end of the trip lever 16 from the other end of the lever 14. When this engagement is released, the lever 14 rotates clockwise around the shaft 15 due to the force of the roller 13, so the roller 13 rotates on the inclined surface 6a of the cross bar 6, as shown in FIG. It falls between the lever 14 and the side of the crossbar 6. Therefore, the cross bar 6 is moved by the spring force of the first compression spring 7 in the opening direction, that is, to the position indicated by the dashed-dotted line in the figure, and the movable contact 4 is moved away from the fixed contact 3 as shown in FIG. Let go. In the state shown in FIG. 3, the manual handle 9 is rotated clockwise around the shaft 10 by the spring force of a torsion spring (not shown), so that the manual handle 9 changes from the state shown in FIG. 3 to FIG. It automatically rotates to the indicated cutting position and stops. In other words, the composite circuit and disconnector are in the disconnected state. In the state shown in FIG. 4, when the manual handle 9 is further rotated clockwise about the shaft 10, the roller 13 moves to the inclined surface 6a of the cross bar 6.
The lever 14 and the trip lever 16 are engaged and enter the reset state shown in FIG. When the manual handle 9 is rotated counterclockwise about the shaft 10 from the reset state shown in FIG. 5, the roller 13 presses the inclined surface 6a of the cross bar 6 and moves it in the entry direction.
When the manual handle 9 is further rotated counterclockwise and operated to the ON position shown in FIG. 1, the movable contact 4 comes into contact with the fixed contact 3 and enters the ON state. Next, when a fault current flows into the composite circuit breaker in the ON state shown in FIG. 1, the electromagnetic tripping coil 19 detects this and rotates the trip lever 16 clockwise about the shaft 17. , the engagement between the trip lever 16 and the lever 14 is released. When this engagement is released, the lever 14 is rotated clockwise about the shaft 15 by the force of the roller 13. As a result, the roller 13 moves toward the inclined surface 6a of the crossbar 6.
It rotates above and falls between the lever 14 and the side of the crossbar 6. Therefore, the cross bar 6 is moved in the separation direction by the spring force of the first compression spring 7, and thereby the movable contact 4 is separated from the fixed contact 3.
In this case, due to the rotation of the trip lever 16, the operation button 32a of the micro switch 32 disengages from the other end of the trip lever 16, and the micro switch 32 becomes open, so the voltage of the closing electromagnetic coil 28 decreases. There will be no voltage. Therefore, the movable core 29 is moved upward by the spring force of the release spring 31, so that the engagement between the shaft 30 and the movable core 29 is released, and the cross bar 6 is moved upward by the spring force of the release spring 31.
It moves upwards due to the spring force. Next, the operating states of the component parts will be explained.
As a constraint in this operating state, the following is said to be in place from the viewpoint of safety. In other words, when the manual handle 9 is in the off position,
Turn on the operation button (not shown) for controlling the electromagnet device 26, and connect the control signal input terminals 33a and 33b.
Even if a voltage is applied between them, the movable contact 4 must not come into contact with the fixed contact 3. Therefore, for safety reasons, the mutual relationships among the components must be as shown in Table 1.

[Table] Next, Table 1 will be explained. When the manual handle 9 is in the on position, the trip lever 16 is pushing the operation button 32a of the micro switch 32, so an operation button (not shown) for controlling the electromagnet device 26 is placed between the control signal input terminals 33a and 33b.
When a voltage is applied by turning on the microswitch 32, the microswitch 32 is in the on state, so an exciting current is supplied to the closing electromagnetic coil 28, and the movable contact 4 comes into contact with the fixed contact 3. When the operation button (not shown) is turned off, the control signal input terminal 33a,
Since the voltage across 33b becomes zero, the movable iron core 29 is released by the release spring 31, and the trip lever 1 is released.
6 rotates clockwise around the shaft 17,
The movable contact 4 separates from the fixed contact 3. When the trip lever 16 rotates clockwise about the shaft 17, a space is formed between the operation button 32a of the microswitch 32 and the trip lever 16, and the microswitch 32 is turned off. Next, when the manual handle 9 is in the OFF position, even if the operation button (not shown) is operated to the ON position, the micro switch 32 is in the OFF state, so the excitation current is applied to the closing electromagnetic coil 28. Not supplied. Therefore, since the movable iron core 29 is not attracted, the movable contact 4 does not come into contact with the fixed contact 3. As explained above, a remote control function using an electromagnetic switch is added to the circuit and disconnector, and is compactly housed in the molded case 1. Therefore, it is possible to combine the switching function and overcurrent detection function, which are the redundant functions of conventional electromagnetic switches and circuit breakers, into one, so it is possible to combine electromagnetic switches and circuit breakers. Compared to conventional products used in the market, the external size can be significantly reduced, and a safe product can be provided. For safety reasons, when the manual handle 9 is in the off position, even if the operation button (not shown) for controlling the electromagnetic device 26 is turned on, the composite circuit and disconnector is configured so that it will not turn on. has been done. As described above, according to the present invention, the outer size can be significantly reduced and a safe product can be constructed.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a closed state of an embodiment of a composite type circuit breaker according to the present invention, and FIGS. 2 to 5 are explanatory views of the operation of the present invention. In the figures, the same parts in each figure are given the same symbols, 1 is a molded case, 2 is a fixed contact conductive plate, 3 is a fixed contact, 4 is a movable contact, 5 is a movable contact conductive plate, 6 is a cross bar, 6a is an inclined surface, 7 is a first compression spring, 8 is a shaft, 9 is a manual handle, 9a is an operating section, 10 is a shaft, 11 is a link,
12 is a pin, 13 is a roller, 14 is a lever, 15
is a shaft, 16 is a trip lever, 17 is a shaft, 18 is a yoke, 19 is an electromagnetic tripping coil, 20 is a movable iron core, 21 is a protruding shaft, 22 is a tripping pin, 23 is an engagement piece, and 24 is a flexible conductor , 25 is a second compression spring, 26 is an electromagnet device, 27 is a yoke, 28 is a closing electromagnetic coil, 29 is a movable iron core, 29a is one end, 29b is a long hole, 29c is the other end, 30 is a shaft ,
31 is a release spring, 32 is a micro switch, 32
a is an operation button, and 33a and 33b are control signal input terminals.

Claims (1)

[Claims] 1. A fixed contact installed in a frame and fixed to one end of the fixed contact conductive plate, a movable contact conductive plate having a movable contact opposite to the fixed contact fixed to one end, and the movable contact conductive plate. a cross bar rotatably supported at one end and having an inclined surface formed at the other end; A manual handle for opening and closing the plate, a link whose one end is rotatably supported at the internal tip of the manual handle and whose other end engages with the inclined surface, and a link other than the link when an overcurrent of more than a predetermined value flows. A lever that releases the engagement between the end portion and the inclined surface, a compression spring that biases the cross bar in the direction of separating the movable contact conductive plate, a switch that opens when the lever is operated, and 1. A composite circuit breaker comprising: a closing electromagnetic coil to which an excitation current is supplied; and a movable core that operates the lever when the closing electromagnetic coil is deenergized.