JPH0324007B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is capable of switching loads by electromagnetic operation at all times, and in the event of an accidental large current due to a short circuit, etc., it is possible to quickly interrupt the load, thereby improving the interrupting performance. This relates to electromagnetic circuit breakers. [Prior art] An electromagnetic circuit breaker that normally performs load switching operations as stipulated in JIS C 8325 "Electromagnetic switches," but quickly interrupts the circuit when a large current flows due to a short circuit, etc., and acts as a circuit breaker. Various proposals have been made. A conventional example is shown in Japanese Patent Publication No. 60-46501. The main parts of the publication will be explained below. As shown in FIG. 1, overcurrent detection means arranged between the contact plate 28 and the armature 3,
1 and a current circuit means for connecting a contact plate 28, the electromagnetic interrupter comprises a push rod means 26 for pressing the contact plate 28 to move it to an open position, and the overcurrent detection means is a yoke. 22 and coil 23
and a longitudinally movable magnetic core 2 capable of assuming a first stable position in which it abuts the yoke 22 or a second stable position in which it is away from the yoke.
4, wherein the overcurrent detecting means is configured so that the magnetic core 24 is connected to the first
It also includes transmission piston means 48 for cooperating with said magnetic core 24 to longitudinally move said contact plate 28 to a further position, said further position being from said fixed contact to said open position. It is shown that the location is further away than the In this case, when the coil 23 is energized during circuit closing, the armature 3 moves downward in FIG. Part 8
moves downward while compressing the second elastic members 6, 7, and the movable contacts 29, 34 close. Furthermore, when the circuit is opened, the movable contacts 29, 34 are opened by the second elastic members 6, 7 with a force greater than the pressing force of the first elastic member 37, which is an indirect connection method, so that the spring load applied to the electromagnet 21 is large. Become. Figure 8 of this application shows the spring load characteristics of a rated current 20A type electromagnetic circuit breaker as an example, where the vertical axis is the spring load (Kg) and the horizontal axis is the armature 3 of the electromagnets 2 and 21.
stroke (mm). To explain each point of the stroke, 0mm: movable contacts 29, 34
Closing point, 2 mm: The moment when the movable contacts 29, 34 contact the fixed contacts 30, 31 (hereinafter referred to as the starting point),
6 mm: Opening point of the movable contacts 29 and 34. At this time, 1Kg at the opening point, 3.4Kg at the starting point, and 3.4Kg at the closing point.
The overall load is 3.7Kg, especially the electromagnet 2,
Since the starting point, which is closely related to the attraction force characteristics of the electromagnet 21, is as high as 3.4Kg, the shape of the electromagnet 21 becomes larger.
The disadvantages were that the product was large in size and heavy in weight. [Problems to be Solved by the Invention] The purpose of the present invention is to eliminate these drawbacks and provide an electromagnetic breaker that can reduce the size, weight, and cost of the product by reducing the shape of the electromagnet. It is something to do. [Means for Solving the Problems] The present invention provides a movable rod 6 cooperably connected to a movable iron core 20 of an electromagnet, a movable contact 3 held by the movable rod 6, and a movable armature. A main contact part 4 consisting of a fixed contact 2 that comes into contact with and separates from the main contact part 4.
In the electromagnetic breaker having an overcurrent detection means 7 connected in series with the movable iron core 20 and the movable rod 6, the movable iron core 20 and the movable rod 6 are connected via a connecting body 25 and a contact spring 5, and the connecting body 25 is connected to the The contact spring 5 is movably connected to the movable iron core 20 and the movable contact 3
to be elastically held on the movable rod 6. The overcurrent detection device 7 includes a tripping electromagnet 8, an actuation piece 9 that is activated by the attraction operation of the tripping electromagnet 8, and an engaging body 10 that engages with the actuation piece 9. An engagement spring 11 is interposed between the engagement bodies 10 to act on the actuating piece 9 and bias it in the direction of engagement with the engagement body 10, and the attraction force of the tripping electromagnet 8 causes the engagement The actuating piece 9 resists the repulsive force of the coupling spring 11.
to drive the movable contactor 3 in the opening direction via the movable rod 6; and to open the movable iron core 20, the connecting body 2
5 is characterized in that the engaging body 10 and the actuating piece 9 are disengaged from each other. [Function] With the above configuration, the shape of the electromagnet can be reduced by using a contact spring as a direct connection means between the movable core and the movable contact, and the product can be made smaller, lighter, and lower in cost. In addition, the connecting part between the engagement spring and the mounting piece is provided with play through a long hole to prevent the load of the engagement spring from being applied during normal opening and closing, which allows the shape of the electromagnet to be further reduced and the product to be made smaller. , lighter weight, and lower cost. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings.
Fig. 1 is an explanatory diagram of the main parts showing the normal usage state of the present invention, Fig. 2 is an explanatory diagram of the main parts when the excitation coil is turned off and the movable contact is open, and Fig. 3 is an explanatory diagram of the main parts when the excitation coil is turned off and the movable contact is open. It is an explanatory diagram of main parts showing a cut-off state when the overcurrent detection device is activated due to current flow, and 1 is a power supply side terminal, 2 is a fixed contact, 3 is a movable contact that connects and separates the fixed contact 2, and 4 is a main contact portion consisting of the fixed contact 2 and the movable contact 3; 5 is a contact spring that applies contact pressure to the movable contact 3; 6 supports the movable contact 3 via the contact spring 5; A movable rod 7 having an operating portion 6a at its end has an actuation piece 9 attracted to a tripping electromagnet 8 and an engaging body 10 that engages with the actuation piece 9 . An engagement spring 11 is provided between the actuation piece 9 and the case 18, and an actuation piece repulsion spring 28 is provided between the other end 9f of the actuation piece 9 and the case 18. This is an overcurrent detection device installed as shown in FIG. 12 is an overcurrent tripping device having a handle 12a, 13 is a load side terminal, and the main contact portion 4 , the tripping electromagnet 8, and the overcurrent tripping device 12 are connected in series. 14,15
16 is a coil terminal, and 16 is a fixed iron core 19 and a movable iron core 2 supported by an excitation coil 17 and a case 18, etc.
0, 21 is arranged in series between the excitation coil 17 and the coil terminal 15, and the auxiliary fixed contact 2
2, and an auxiliary contact spring 24 that urges the auxiliary movable contact 23 in the circuit closing direction, and the auxiliary contact portion opens and closes according to the operation of the overcurrent tripping device 12 ; The iron core 20 and the movable rod 6 are connected via a connecting body 25 and a contact spring 5. The connecting body 25 is connected to the movable iron core 2
It is attached to the lower part of the movable iron core 20, has contact pieces 25a and 25b extending to the left and right of the middle part, and is connected to the movable iron core 20 so as to be able to move together. The actuation piece 9 of the overcurrent detection device 7 has an intermediate portion 9a rotatably supported by a shaft 9b attached to a case or the like, one end extending to the right in the figure, an opening 9c in the middle, and a distal end. 9a pushes down the action portion 6a of the movable rod 6 during operation, and the other end 9f extends in the opposite direction from the intermediate portion 9a. The engaging body 10 has a substantially T-shape, and has a shaft 10a attached to a case or the like.
The engaging piece 10b, which is rotatably supported by and extends downward, is inserted into the opening 9c of the actuating piece 9. When an accidental large current flows through the main contact portion 4 and the actuating piece 9 is attracted, its upper surface becomes the engaging end 9e of the opening 9c.
I'm trying to get it down to. The engagement body 10 is always urged counterclockwise, that is, in the engagement direction, by the engagement spring 11, and when the actuation piece 9 is lowered as described above, the engagement portion 10c and the engagement end 9e are It's starting to engage. Further, when the movable iron core 20 is opened, the action piece 10d extending to the right comes into contact with the abutting piece 25a on the left side of the connecting body 25 in the figure, and rotates counterclockwise, thereby causing the engagement end 9e and the engagement portion 10c to contact each other. Disengage and
The engagement spring 1 is inserted between the intermediate portion of the mounting piece 10e extending leftward and the actuating piece 9 in a direction that draws them together.
1 is interposed. To explain the operation of the present invention configured in this way, under normal conditions, a voltage is applied between the coil terminals 14 and 15 regardless of the overcurrent detection device 7 , and the electromagnet 1
The main contact portion 4 closes due to the suction force 6, resulting in the state shown in FIG. Next, if the electromagnet 16 is demagnetized, the repulsion spring 2
6, the movable iron core 20 is opened, and the abutment piece 25b on the right side of the connecting body 25 abuts against the stopper 27 provided on the fixed part of the case 18, etc., and stops.
It will be in the state shown in the figure. When an accidental large current flows through the main contact part 4 , the actuating piece 9 is activated by the attraction force of the tripping electromagnet 8.
is attracted, and the contact spring 5, the engagement spring 11, and the repulsion spring 28 are moved around the shaft 9b.
The tip 9d of the actuating piece 9 pushes down the acting part 6a of the movable rod 6 against the urging force of 9 stops at the position where it is attracted to the tripping electromagnet 8, and the actuating piece 9 and the engaging piece 10b of the engaging body are engaged, resulting in an open lock state (the state shown in FIG. 3), and at the same time, the overcurrent tripping device 12 is activated. The auxiliary contact portion 21 is also opened and the electromagnet 16 is deenergized. The movable iron core 20 is opened together with the connecting body 25 by the bias of the repulsion spring 26. At that time, the left abutting piece 25a of the connecting body 25
0d in the clockwise direction, the engagement end 9e and the engagement part 10c are disengaged, and the state shown in FIG. open up to. When reusing the device, the handle 12a of the overcurrent tripping device 12 is manually returned to the automatic position, and the contact point of the auxiliary contact portion 21 is returned to form a closed excitation circuit for the electromagnet 16 , so that it can be turned on. In the above example, a manual return type was used, but an automatic return type would have the same effect. The actuating piece 9 may be directly attracted to the tripping electromagnet 8 as in the embodiment described above, or it may be attached to the movable iron core 8a or plunger 8b driven by the tripping electromagnet 8 as shown in FIG. It may also be an actuating piece 9 that is indirectly actuated. Further, as in the above-described embodiment, the connection between the connecting body 25 and the movable core 20 may be integrated by being attached to the lower part, or may be formed integrally with the movable core 20 (not shown), or may be formed integrally with the movable core 20 (not shown). (not shown) may be swingably mounted. FIG. 5 shows another embodiment of the present invention, and the difference from the above-mentioned embodiment is that the mounting piece 10 of the engaging body 10
A play is provided in the connecting portion between e and the engagement spring 11. In this case, the engagement spring 11 is attached to a long hole 10f provided in the mounting piece 10e, and when normally opened and closed, the engagement spring 11 is attached to the left side of the coupling body 25. Contact piece 2
Even if 5a comes into contact with the action piece 10d of the engaging body 10 ,
There is play due to the elongated hole 10f, and the urging force of the engagement spring 11 and the repulsion spring 28 is not applied to the connecting body 25. The elongated hole 10f may be provided on the actuating piece 9 side. 6 and 7 show the spring load characteristics of a rated current 20A type electromagnetic circuit breaker as an example of the present invention,
Portions equivalent to or corresponding to the conventional spring load characteristics shown in FIG. 8 are given the same names. In Figure 6,
0.25Kg at the opening point, 1.7Kg at the starting point, and 1.7Kg at the closing point.
The load is 2.2Kg, which is smaller overall than the conventional example, and in particular, the starting point, which is closely related to the attraction force characteristics of the electromagnet 16 , is 1.7Kg, which is 1/2 the load of the conventional example.
By reducing the shape of the electromagnet 16 , the product can be made smaller, lighter, and lower in cost. Further, in the other embodiment of the present invention shown in FIG. 7, the weight is 0.25 kg at the opening point, 1.3 kg at the starting point, and 1.7 kg at the closing point, and the starting point and closing point are about 0.5 kg more than the embodiment shown in FIG. 6. Since the 20% load is small, the shape of the electromagnet 16 can be made even smaller, and the product can be made smaller, lighter, and lower in cost. [Effects of the Invention] As described above, the present invention uses a contact spring as a direct connection means between the movable iron core and the movable contact, so that the shape of the electromagnet can be reduced, and the product can be made smaller, lighter, and lower in cost. In addition, the shape of the electromagnet can be made even smaller by providing play with a long hole in the connecting part between the engagement spring and the mounting piece to prevent the load of the engagement spring from being applied as a load during normal opening and closing. This allows the product to be made smaller and lighter.
This has the effect of reducing costs.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the main parts showing the normal usage state of the present invention, Fig. 2 is an explanatory diagram of the main parts when the excitation coil is turned off and the movable contact is open, and Fig. 3 is an explanatory diagram of the main parts when the excitation coil is turned off and the movable contact is open. FIG. 4 and FIG. 5 are main part explanatory diagrams showing other embodiments of the present invention, and FIGS. 6 and 7 are Diagram showing the spring load characteristics of the present invention, No. 8
The figure is a diagram showing the spring load characteristics of a conventional example. 2: Fixed contact, 3: Movable contact, 4 : Main contact part, 5: Contact spring, 6: Movable rod, 7 : Overcurrent detection device, 10 : Engagement body, 11: Engagement spring, 12 : Overcurrent Tripping device, 16 : Electromagnet, 2
1: Auxiliary contact part, 25: Connecting body.

Claims (1)

[Claims] 1. A movable rod 6 cooperably connected to a movable iron core 20 of an electromagnet 16 , a movable contact 3 held by the movable rod 6, and a fixed member that approaches and separates from the movable contact 3. In an electromagnetic breaker having a main contact part 4 consisting of a contactor 2 and an overcurrent detection device 7 connected in series to the main contact part 4 , a connecting body 25 is provided between the movable iron core 20 and the movable rod 6. The connecting body 25 is movably connected to the movable iron core 20, and the contact spring 5 is connected to the movable contactor 3 via a contact spring 5.
is elastically held on the movable rod 6, and the overcurrent detection device 7 engages with a tripping electromagnet 8 and an actuation piece 9 that is activated by the attraction operation of the tripping electromagnet 8. an engaging spring 11 is interposed between the actuating piece 9 and the engaging body 10 to act on the actuating piece 9 and bias it in a direction to engage with the engaging body 10; Due to the attractive force of the tripping electromagnet 8, the actuating piece 9 is moved against the repulsive force of the engagement spring 11.
to drive the movable contactor 3 in the opening direction via the movable rod 6; and to open the movable iron core 20, the connecting body 2
An electromagnetic breaker characterized in that 5 releases the engagement between the engaging body 10 and the actuating piece 9. 2 Engagement body 10 of overcurrent detection device 7 during normal opening/closing
The electromagnetic circuit breaker according to claim 1, characterized in that a long hole 10f is provided in either one of the operating pieces 9 so that the load of the engagement spring 11 is not applied thereto.