JPH0512979A - Remote controlled circuit breaker - Google Patents

Abstract

PURPOSE:To prevent an electric contact from bouncing by furnishing an electric magnet stopper spring for fixation of the position between the inner surface of a case and the end of electric magnet in the motion direction of a plunger which is to open the contact. CONSTITUTION:When a handle 32 is operated by hand, an electric contact 1 can be opened and closed by a mechanism part 3, and when an abnormal current has flowed due to shortcircuit, over-current, etc., the contact 1 is opened by the mechanism part 3 with actuation of a failure current sensing part 25. Further, when a remote signal is applied to an electric magnet 19, a plunger 53 is operated to make opening and closing of the contact 1. Therein an impact is applied to an electric magnet stopper spring 72 with the motion of plunger 53 from ON to OFF, so that the contact 1 is prevented from bouncing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control type circuit breaker.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional example. That is, this remote control type circuit breaker accommodates an electromagnet 101 having a plunger 100 capable of reciprocating within a certain range and opening and closing a contact portion (not shown) by inputting a remote signal, and the electromagnet 101. A case 102 having a housing chamber 104 is provided, and an electromagnet stop spring 103 for stopping the electromagnet 101 in the case 102 is provided between the electromagnet 101 and the inner surface of the case 102.

A printed circuit board 105 is provided integrally with the electromagnet 101, and the printed circuit board 105 is provided with the electromagnet 101.
The changeover switch 106, which is an example of a microswitch for changing over the energization direction of the coil, is provided.
00 by the operation frame 107 integrated with the changeover switch 1
06 is working. 108 is a power supply terminal, 1
Reference numeral 09 is a remote signal terminal.

In this remote control type circuit breaker, the electromagnet 101 is incorporated in a case 102, a contact portion (not shown) is incorporated, an electromagnet stop spring 103 for fixing the electromagnet 101 is inserted, and then an insulating cover 110 is provided. Over the electromagnet 101, and then power source terminal 1 from above
Incorporate 08 blocks. At this time, electromagnet stop spring 1
03 is a small part and may be forgotten to be assembled, but it is provided below the electromagnet 101 so that it can be inserted later.

[0005]

However, in this remote control type circuit breaker, when the contact portion is changed from OFF to ON, the plunger 100 moves in the downward direction of FIG. 7, that is, in the direction of pressing the electromagnet stop spring 103, The electromagnet stop spring 103 is generated by the collision energy when the outer yoke 111 that restricts the reciprocating range of the plunger 100 collides and stops.
The electromagnet 101 is bent as a whole
Vibrates inside. As a result, the contact portion once turned on separates and chattering occurs.

Further, the changeover switch 106 attached to the printed circuit board 105 integrated with the electromagnet 101 is operated by the operation frame 107 integrated with the plunger 100. The switching timing position is at the center of the stroke of the plunger 100. Below the position, that is, changeover switch 10
It is on the 6 side. Therefore, when the electromagnet 101 vibrates due to the energy generated when the plunger 100 collides with the outer yoke 111, the changeover switch 106 that has once been switched may return to its original state.

As described above, the conventional example has a drawback that the contact part may bounce when the contact part is turned on and the changeover switch 106 may malfunction. Therefore, an object of the present invention is to provide a remote control type circuit breaker capable of reducing the bounce of contacts.

[0008]

A remote control type circuit breaker according to the present invention has a contact portion, a handle and an abnormal current detecting portion, and opens and closes the contact portion in conjunction with the operation of the handle. A mechanism section that trips and opens the contact section in conjunction with the operation of the abnormal current detection section; an electromagnet that is reciprocable within a certain range and has a plunger that opens and closes the contact section by inputting a remote signal; In a remote control type circuit breaker including a contact portion, the mechanism portion, and a case accommodating the electromagnet, an end portion of the electromagnet in an operation direction of the plunger that opens the contact portion and an inner surface of the case It is characterized in that an electromagnet retaining spring for fixing the position is provided between them.

[0009]

According to the structure of the present invention, when the handle is manually operated, the contact portion can be opened and closed by the mechanism portion, and in the case of an abnormal current such as a short circuit or an overcurrent, the contact portion is opened by the operation of the abnormal current detection portion. Polarize. When a remote signal is further applied to the electromagnet, the plunger operates and the contact part opens and closes.
In this case, since the impact force is applied to the electromagnet stop spring by the operation of turning the plunger from on to off, it is possible to prevent contact bounce from occurring at the contact portion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, this remote control type circuit breaker includes a contact portion 1, a mechanism portion 3, and an electromagnet 19
And a case 4. The contact portion 1 is composed of a first movable contact 36 and a second movable contact 39, and the movable contacts 35 and 38 provided on the first movable contact 36 and the second movable contact 39 face each other so as to come into contact with and separate from each other. The intermediate portion of the first movable contactor 5 is axially supported by the fixed shaft 34 provided on the frame 6, and is biased in the opening direction by the opening spring 37. The second movable contact 39 is held on one piece of the L-shaped lever 56 via a contact spring 58, and the bent portion of the lever 56 is pivotally supported by the case 4 by a fixed shaft 57.

The mechanical section 3 has a handle 9 and an abnormal current detecting section 10, and opens and closes the contact section 1 in conjunction with the operation of the handle 9 and also interlocks with the operation of the abnormal current detecting section 10. Open the trip. The handle 32 is pivotally supported by the fixed shaft 31 of the frame 6 and is partially exposed from the handle hole 65 of the case 4. The abnormal current detection unit 25 includes a bimetal 24 for detecting an overcurrent and an electromagnet 23 for detecting a short circuit. The bimetal 24 is fixed to the frame 6 of the mechanism unit 5, and the electromagnet 23 is integrally incorporated in the frame 6. In the mechanism portion 5, the latch link 27 is pivotally supported coaxially with the fixed shaft 31 of the frame 6, and the latch link 27 is latched by the trip link 26. The trip link 26 is pivotally supported by the fixed shaft 33 and responds to the abnormal current detection unit 25 to release the latch of the latch link 27. A movable shaft 29 is slidably provided in the slit 28 of the latch link 27, a handle link 30 is connected between the movable shaft 29 and the handle 32, and the movable shaft 29 and the first movable contact 36 are connected. The connection link 66 is connected between them. Incidentally, 67 is a forced opening rod provided at the end of the plunger of the electromagnet 23.

When the handle 32 is rotated from the state of being tilted to the left side of FIG. 1 to the position of the imaginary line which is tilted to the right side, the handle link 30 is pulled up, the movable shaft 29 slides in the slit 28, and the connecting link 66 is moved. By moving in the direction of the first movable contact 36, the first movable contact 36 is opened by the spring force of the opening spring 37. When the handle 32 is rotated to the original position, the first movable contact 36 is closed by the opposite operation. In the case of overcurrent, the operation of the bimetal 24 delays for a certain time,
In the case of a short-circuit current, the electromagnet 23 instantly activates the abnormal current detector 25, which causes the trip link 26 to respond and release the latch of the latch link 27. The latch link 27 is provided by the spring force of the opening spring 37 applied to the latch link 27 via the connecting link 66 and the movable shaft 29.
The first movable contactor 36 is opened at the same time when is rotated.
In the case of a short circuit, the plunger of the electromagnet 23 performs a forced opening operation.

The electromagnet 3 is capable of reciprocating within a certain range and receives a remote signal to open and close the contact portion 1.
Have three. The electromagnet 3 is bistable and polar, and has a coil frame 68 around which the coil 50 is wound, a pair of inner yokes 51 arranged on both sides of the coil frame 68, and an inner yoke 5.
1 is attached to the outer surface of the permanent magnet 54, the outer yoke 52 is provided outside the permanent magnet 54 to restrict the reciprocating range of the plunger 53, the plunger 53 penetrating the coil frame 68, and both ends of the plunger 53. An armature 55 provided between the ends of the inner yoke 51 and the outer yoke 52.
And an insulating cover 69. 59 is the plunger 53
The assisting spring, 64 is a lead wire connected to the coil 50,
Reference numeral 70 is a residual plate.

In this electromagnet 19, one of the armatures 55 is attracted to the inner yoke 51 by the permanent magnets 54, and
The other one is held in a state of being sucked by the outer yoke 52,
When a remote signal is applied to the coil 50 via the lead wire 64, the plunger 53 becomes operable by exciting the coil 50, and the armature 55 moves from the outer yoke 52 to the inner yoke 5.
It moves by changing the energization direction so that it is attracted to 1 or from the inner yoke 51 to the outer yoke 52.

The case 4 accommodates the contact portion 1, the mechanism portion 3 and the electromagnet 19. In the embodiment, it has an opening on the side surface and is closed by a cover (not shown). Case 4 again
The power supply terminal 20 and the load terminal 21 are provided on both ends of the arc-extinguishing device, and the arc extinguishing device 2 is provided on the bottom side of the mechanism unit 3. in this case,
The electromagnet 19 is provided in the case 4 in the electromagnet housing chamber 7
1, the upper end of the plunger 53 is connected to the other piece of the lever 56 via the connecting portion 73, and the end of the electromagnet 19 in the operating direction of the plunger 53 that opens the contact 1 and the case 4 are connected. An electromagnet stop spring 72 for position fixing is provided between the inner surface of the electromagnet housing chamber 71 and the inner surface of the electromagnet housing chamber 71, that is, the electromagnet 19 is fixed without rattling. The electromagnet stop spring 72 of the embodiment is formed of a dogleg shaped leaf spring. An insulating cover 69 is interposed between the electromagnet accommodation chamber 71 and the electromagnet 19 to insulate the power supply terminal 20. The electromagnet 19 is the plunger 5.
When 3 is located below as shown in FIG. 1, the movable contact 38 of the second movable contact 39 contacts the movable contact 35 of the first movable contact 36 to be in the closed state, and the electromagnet 19 is driven. Then, when the plunger 53 is moved upward, the lever 56
Rotates about the fixed shaft 57 to open the second movable contact 39. In this way, by supplying the remote signal of the electromagnet 19, the second movable contact 39 is opened and closed. Further, when the plunger 53 moves upward in FIG. 1 so that the second movable contact 39 opens, the energy generated when the armature 55 on the upper end collides with the residual plate 70 of the outer yoke 52 causes the electromagnet stop spring to move. Although 72 is elastically deformed and bent, since the second movable contactor 39 is in the open state, conventional chattering does not occur.

The arc extinguishing device 2 includes an arc extinguishing chamber 40 formed by a case 4 so that the contact portion 1 is located inside, insulating plates 41 arranged on both sides of the contact portion 1, and a first movable contact. Movable contacts 35 and 38 of the child 36 and the second movable contact 39
Arc traveling plates 42, 43 disposed in the vicinity of the arc traveling plates 42, 43, and an arc extinguishing grid 44 provided between the arc traveling plates 42, 43,
And an exhaust hole 45.

Reference numeral 5 is a bottom wall of the case 4, 7 is an interlocking hole for passing an interlocking member (not shown) interlocking with the trip to the other pole, 8 is a gas shielding piece for positioning the frame 6, and 60 is a first It is a display member for displaying the operating state of the second movable contactor 39. According to this embodiment, when the handle 32 is manually operated, the contact portion 1 can be opened and closed by the mechanism portion 3, and when an abnormal current such as a short circuit or an overcurrent occurs, the operation of the abnormal current detection portion 25 causes the mechanism portion 3 to contact the contact portion 1. Opens. Further electromagnet 1
When a remote signal is applied to 9, the plunger 53 operates and the contact portion 1 opens and closes. In this case, since the impact force is applied to the electromagnet stop spring 72 by the operation of turning the plunger 53 from ON to OFF, it is possible to prevent the contact part 1 from bouncing.

The second embodiment of the present invention is shown in FIGS.
Is shown in. That is, in this remote control type circuit breaker, a printed circuit board 76 on which a pair of changeover switches 75 for switching the energization direction of the coil 50 in conjunction with the operation of the electromagnet 19 is mounted is arranged below the electromagnet 19. 76 is hung on the outer yoke 52 with a suspension rod 77, and a lead wire connection terminal 78 is provided. Reference numeral 79 is an interlocking frame which is attached to the lower end of the plunger 53 and operates the changeover switch 75 by the operation of the plunger 53. The load terminal 21 has the same configuration as the power supply terminal 20. Others are the same as those in the first embodiment.

According to this embodiment, the changeover switch 75 is operated by the operation frame 79 integrated with the plunger 53, and the timing position of the plunger 53 is below the center position of the stroke of the plunger 53, that is, the changeover switch 75. However, since the electromagnet stop spring 72 does not vibrate when the plunger 53 moves downward, the changeover switch 75 does not return to its original position, and thus the malfunction of the changeover switch 75 can be prevented.

[0020]

In the remote control type circuit breaker of the present invention, an electromagnet stop spring for fixing the position is provided between the end of the electromagnet and the inner surface of the case in the operation direction of the plunger that opens the contact. Since it is provided, an impact force is applied to the electromagnet stop spring by the operation of turning the plunger from on to off, so that it is possible to prevent contact bounce from occurring at the contact portion.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the electromagnet.

FIG. 3 is a partially omitted sectional view of a second embodiment.

FIG. 4 is a left side view thereof.

FIG. 5 is a plan view.

FIG. 6 is an exploded perspective view of a printed circuit board portion.

FIG. 7 is a partial cross-sectional view of a conventional example.

[Explanation of symbols]

 1 Contact point 3 Mechanism part 4 Case 19 Electromagnet 25 Abnormal current detection part 32 Handle 53 Plunger 72 Electromagnet stop spring

Claims (1)

Claim: What is claimed is: 1. A contact portion, a handle, and an abnormal current detection portion are provided, and the contact portion is opened and closed in conjunction with the operation of the handle, and is associated with the operation of the abnormal current detection portion. Mechanism, which trips and opens the contact portion, and an electromagnet having a plunger that can reciprocate within a certain range and opens and closes the contact portion by inputting a remote signal; the contact portion, the mechanism portion, and the electromagnet. In a remote control type circuit breaker having a case for accommodating an electromagnet, a position-fixing electromagnet stop spring is provided between an end of the electromagnet and an inner surface of the case in an operation direction of the plunger that opens the contact portion. A remote control type circuit breaker characterized by being provided with.