JPS62290032A - Arc extinguisher - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Technical Field 1 The present invention is an arc extinguisher, more specifically, an arc extinguisher that extinguishes an arc that occurs when a contact inserted between a power source and a load is opened. The present invention relates to an arc extinguishing device.

[Background Art 1] This type of arc extinguishing device is generally used in circuit breakers, etc., and an arc extinguishing grid portion is disposed near a fixed contact that constitutes a movable contact, a contact portion, and an α portion. According to
The arc generated when the contact section is opened is divided and extinguished within the arc extinguishing grid section. In addition, in such an arc extinguishing device, in order to easily introduce the arc into the arc extinguishing grid, the Lorentz force that acts between the arc and the magnetic field generated by the arc current when the contact is opened is used to direct the arc into the arc extinguishing grid. Conventionally, arc drive coils have been provided to bias the arc toward the opposite direction.

By the way, since the conventional arc drive coil was formed into a half turn, the magnetic field generated around the arc drive coil was weak, and the force sent to the arc extinguishing grid was insufficient. .

E. Purpose of the Invention The present invention has been made in view of the above-mentioned points, and its main purpose is to generate a strong magnetic field by making the arc drive coil approximately one turn, and to generate an arc. An object of the present invention is to provide an arc extinguishing device that rapidly extinguishes an arc.

[Disclosure of the Invention] (Structure) The present invention includes a fixed contact plate having a fixed contact provided on its surface, which together with a movable contact constitutes a contact portion, and a fixed contact plate fixed at one end of the fixed contact plate at a position different from that of the fixed contact. An arc extinguishing grid part is disposed on the surface side where the contact is provided and extinguishes the introduced arc, and one end is connected to the other end of the fixed contact plate and protrudes toward the fixed contact side in the thickness direction of the fixed contact plate. The arc extinguishing grid includes a pair of arc drive coils that are curved in shape and whose central axes are orthogonal to the direction connecting the fixed contacts and the arc extinguishing grid, and a fixed terminal plate connected to the other end of the arc drive coil. The part is equipped with a plurality of grid plates arranged substantially parallel to each other in the thickness direction of the fixed contact plate, and both arc drive coils are each formed in a one-turn annular shape and spaced apart from each other with the fixed contact in between. Disclosed is an arc extinguishing device characterized by being arranged as follows.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In addition, in the following examples, an example in which the present invention is applied to a circuit breaker will be shown.

First, the basic configuration of a circuit breaker will be explained based on FIG. The container body 10 is constructed by joining a pair of half-circular bodies 10a and 10b made of synthetic resin with a fixture 11 such as a rivet. A handle 12 protrudes from the upper surface of the container body 10 so as to be freely raised and lowered. Inside the vessel body 10, a trip device @20° trip device 30 and an arc extinguishing device 40 are arranged.

The trip device j120 is composed of an electromagnetic trip section 21 and a thermal trip section 25, as shown in Figure #7. The electromagnetic tripping section 21 is composed of a coil 22, a substantially F-shaped yoke 23 surrounding the outer periphery of the fill 22, and a plunger 24 inserted into the coil 22 so as to be freely advanced and retracted, and the plunger 24 protrudes from the coil 22. The plunger 24 is biased in this direction, and the plunger 24 is pulled into the coil 22 when an overcurrent of several times to several tens of times the rated value flows through the coil 22. The thermal tripping section 25 is a bimetallic plate 2
6, and when a large current slightly larger than the rated current flows for a long time, the upper end curves to the left in Figure 7 due to self-heating. A press screw 27 is screwed into one end of the bimetal plate 26 so that it can move forward and backward. In this tripping device 20, one end of a fill 22 is electrically connected to the terminal plate 1 exposed at one end of the container body 10 via a connection #12, and the other end of the coil 22 is connected to the lower end of a bimetal plate 26. electrically connected.

As shown in FIG. 7, the trip device 30 includes a latch link 31, a trip link 32, and a movable contact 3 at the lower end.
3a, a compression spring 34 that contacts the left end of the trip link 32, a tension spring 35 that connects the handle 12 and the movable contact 33, and a latch link 31 that connects the latch link 31 to the container body 10. A shaft pin 36 that pivotally supports the handle 12, the trip link 32, and the upper end of the movable contact 33 on the container body 10; A hook pin 38 is provided. The latch link 31 is urged around in FIG. 7 by an iron bone 39 fixed at a fixed position on the container body 10, and the upper end of the latch link 31 corresponds to the pressing screw 27, and the lower end corresponds to the plunger. 24, and when either the electromagnetic tripping section 21 or the thermal tripping section 25 operates, the latch link 31 rotates counterclockwise in FIG. 7 against the spring force of the iron spring 39. It looks like this. Further, the latch link 31 is formed with a locking step portion 31a that can be engaged with a locking piece 32a provided at the right end portion of the trip link 32. The shaft pin 37 has a central portion in the axial direction bent into a substantially F-shape, and this U-shaped portion is bent toward the handle 1.
It is contained within 2. The compression spring 34 has one end connected to the vessel body 1.
0, and the other end abuts the right end of the F lip link 32 from diagonally above. That is, the trip link 32 is biased counterclockwise in FIG. The trip link 32 has an engagement protrusion 32b projecting upward from the right end, and the engagement protrusion 32b is formed at the right end of the lower surface of the handle 12 when the handle 12 is tilted to the right. It can be engaged with the mating recess 14. The tension spring 35 has an upper end connected to a horizontal piece of the U-shaped portion of the shaft pin 37, and a lower end connected to a hook pin 38 of the movable contact 33. A stopper piece 32e and a pressing piece 32d are provided at the lower end of the trip link 32, and the movable contact 33 can swing between the stopper piece 32c and the pressing piece 32d. The movable contact 33 is electrically connected to the upper end of the bimetal plate 26 via a connecting wire 3 such as a braided wire.

The arc extinguishing device 40 includes a fixed contact plate 4 equipped with a fixed contact 41a.
1, a pair of arc drive filters 42, one end of which is connected to the vessel body 10.
It is composed of a fixed terminal plate 43 that outputs a Q* signal, and an arc extinguishing grid section 44 that extinguishes an arc generated when a contact section consisting of a movable contact 33a and a fixed contact 41a is opened.

Fixed contact plate 31, arc drive coil 42, and fixed terminal plate 4
3 is formed integrally by bending a sheet metal. That is, as shown in FIG. 3, a rectangular conductive sheet metal 50 having a substantially U-shaped cutout window 51 in the center is bent into a shape as shown in FIG. By this, sheet metal 30
The tongue piece 52 protruding into the cutout window 51 serves as the fixed contact plate 31, the pair of side pieces 53 surrounding the cutout window 51 serve as the arc drive coil 42, and the remaining portion serves as the fixed terminal plate 43. Here, the fixed contact plate 31 and the fixed terminal plate 33 are substantially perpendicular to each other, and the arc drive coil 42 is formed in an annular shape with approximately one turn. A fixed contact 41a is fixed to the base of the tongue piece 52, and the arc drive coil 42 is connected to the fixed contact plate 3.
The fixed contacts fi, 41a are formed in such a way that they protrude toward the fixed contact 41a side in the thickness direction of the fixed contact 41a. As shown in FIGS. 4 and 6, the arc-extinguishing grid section 44 includes a plurality of grid plates 45 arranged substantially parallel to the fixed contact plate 41 and spaced apart from each other, and a plurality of grid plates 45 disposed in the width direction of the fixed contact plate 41. A pair of support plates 46 are arranged on both sides of the grid plate 45 to hold both ends of the grid plate 45. Each grid plate 45 has a notch 47 at the center of the edge of the fixed contact 41a.
It is made of a conductive material and has a shape in which it is formed. The notch 47 of the grid plate 45 corresponds to the tip of the movable contact 33, and the tip of the movable contact 33a corresponds to the tip of the movable contact 33a when the contact portion composed of the movable contact 33a and the fixed contact 41a is open. The notch 47 is not in contact with the grid plate 45.
It is located inside. The support plate 46 is the glass 7
A thin plate material made of an insulating material such as Ivar,
It is fixed at a fixed position within the vessel body 10 and covers not only the side surface of the grid plate 45 but also the inner surface of the arc drive coil 42. That is, the arc drive coil 42 and the contact portion are isolated, and the r! of the contact portion is isolated. The arc generated during RfIi is prevented from flying directly to the arc drive fill 42. Here, the arc drive coil 42 and the grid plate 45 are arranged at positions that do not overlap in the longitudinal direction of the fixed contact plate 41.

(Operation) Hereinafter, the basic operation of the circuit breaker will be explained based on FIGS. 7 to 9. First, as shown in FIG.
In the off state where the is tilted to the right side, the locking piece 32a of the trip link 32 is locked to the locking step 31a of the latch link 31, and at this time, the central axis of the tension spring 35 is Since it passes on the right side of the shaft pin 37, the movable contact 33
is biased counterclockwise around the shaft pin 37, and the movable contact 33
a is separated from the fixative solution, 41 a. In this state, the open position of the movable contact 33 is regulated by the stopper piece 33C, and the engagement protrusion 31b of the latch link 31 of the handle 12 is positioned in the engagement recess 14 of the handle 12.
It is held in place by engaging the.

From this state, as shown in FIG. 8, when the 7% handle 12 is tilted to the left, only the handle 12 is tilted to the left while the latch link 31 and trip link 32 remain engaged, so that the tension spring 35, the movable contact 33 rotates clockwise around the shaft pin 37, and as a result, the central axis of the tension spring 35 passes through the right side of the shaft pin 37, and the movable contact 33 rotates clockwise. is energized by In other words, the movable contact 33a is biased toward the fixed contact 41a, and the contact portion is closed to enter the set state, and in this state, a predetermined contact pressure can be obtained by the spring force of the tension spring 35.

When a large current slightly larger than the rated value is applied for a long time in the set state, or an overcurrent several times to several tens of times the rated value is applied, the tripping device 20 is activated and the latch link 31 is rotated counterclockwise against the spring force of the iron spring 39. As a result, the locking state between the locking step portion 31a of the latch link 31 and the locking piece 32a of the trip link 32 is released, and the trip link 32 is rotated counterclockwise by the spring force of the compression spring 34. At this time, the pressing piece 33d of the trip link 32 comes into contact with the movable contact 33, and the movable contact 33 is pressed counterclockwise, causing the tension spring 3
5 until the center axis of the shaft pin 3 passes through the left side of the shaft pin 37.
8 moves, the spring force of the tension spring 35 in addition to the spring force of the compression spring 34 acts to bias the movable contact 33 counterclockwise, and as shown in FIG. The contact point 41a is rapidly opened and separated from the contact point 41a. here,
The handle 12 will be located at almost the neutral position of the swing range, but when the handle 12 is tilted to the right from this state and the reset operation is performed, the engagement protrusion 32a will engage the engagement recess 14 and the handle will 12 presses the trip link 32 clockwise, the latch link 31 and the trip link 32 engage again and return to the OFF state.

By the way, when the contact portion is in a closed state, the arc drive coil 42 is
A magnetic field is generated around it. Here, the contact part is rfR
As a result, as shown in FIG. 5, an arc 4 is generated between the fixed fluid α41a and the movable contact 33a.
The arc 4 is urged toward the arc-extinguishing grid section 44 by the Lorentz force, which is the interaction between the magnetic field and the above magnetic field. That is, at the same time as the contact portion is opened, the arc 4 is introduced between the grid plates 45 and the arc bar is elongated, as shown in FIG. In this way, the arc 4 is fed into the arc-extinguishing grid portion 44, so when the fixed contact 41a and the movable contact 33a are further separated, the arc 4 is PIqed by the opening of each grid plate 45, and is rapidly extinguished. It is. Here, since the arc drive coil 42 is formed in a one-turn annular shape, the strength of the magnetic field around the arc drive coil 42 becomes large, and as a result, the arc 4 is extinguished immediately when the contact portion is opened. The arc is introduced into the arc grid section 44, and the arc can be extinguished even in a standing position. Furthermore, since the contact portion is interposed between the pair of arc drive coils 42, the magnetic field acting on the arc 4 is uniform, and the arc 4 is reliably fed into the arc extinguishing grid portion 44 without being deflected laterally. This is possible.

[Effects of the Invention 1] As described above, the present invention provides a fixed contact plate having a fixed contact on its surface that forms an oval contact portion together with a movable contact, and a fixed contact plate provided at one end of the fixed contact plate at a position different from that of the fixed contact. An arc extinguishing grid part is disposed on the surface side where the fixed contact is provided and extinguishes the introduced arc, and one end is connected to the other end of the fixed contact plate and is arranged on the fixed contact side in the thickness direction of the fixed contact plate. A pair of arc drive coils that are curved in a protruding manner and whose central axes are orthogonal to the direction connecting the fixed contact and the arc extinguishing grid part, and a fixed terminal plate that is connected to the other end of the arc drive and the arc extinguishing filter.
The arc extinguishing grid section includes a plurality of grid plates spaced apart from each other and arranged substantially parallel to each other in the thickness direction of the fixed contact plate, and both arc drive coils are each formed in a ring shape with one turn. Since the arc drive coil is formed in a one-turn ring shape, the strength of the magnetic field formed around the arc drive coil is increased to increase the arc drive coil. Since a large Lorentz force can be applied to the arc and the acceleration that urges the arc becomes large, the arc can be quickly extinguished and has the advantage of having a high current limiting effect. In addition, since the pair of arc drive coils are spaced apart with the fixed contact in between, the magnetic field formed around the contact becomes uniform, ensuring that the arc is extinguished without being deflected to the side. It has the advantage that it can be fed into the arc grid section.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an example of a circuit breaker using the present invention, FIG. 2 is a perspective view of essential parts showing an embodiment of the present invention,
FIG. 3 is a plan view of a sheet metal forming the same, FIG. 4 is a partially cutaway perspective view of the same, FIGS. 5 and 6 are explanatory diagrams of the operation of the same, and FIGS. It is an explanatory diagram of the operation of the circuit disconnector used. 33a is a movable contact, 41 is a fixed contact plate, 41a is a fixed contact, 42 is an arc drive coil, 43 +! The fixed terminal plate, 44 is an arc-extinguishing grid part, and 45 is an arc-extinguishing grid knot plate. Agent Patent Attorney Ishi 1) Ai 7 Figure 1 Figure 2 Figure 3 Figure 4 vJ5 Figure 99 (.,.

Claims (2)

[Claims] (1) A fixed contact plate with a fixed contact on its surface that forms a contact section together with a movable contact, and a fixed contact on the surface side with a fixed contact located at one end of the fixed contact plate at a different position from the fixed contact. The arc-extinguishing grid section extinguishes the arc introduced by the arc, and the arc-extinguishing grid section has one end connected to the other end of the fixed contact plate, and is curved so as to protrude toward the fixed contact side in the thickness direction of the fixed contact plate, and the central axis is the fixed contact. A pair of arc drive coils perpendicular to the direction connecting the arc drive coil and the arc extinguishing grid section, and a fixed terminal plate connected to the other end of the arc drive coil, and the arc extinguishing grid section is connected to the arc extinguishing grid section in the thickness direction of the fixed contact plate. It includes a plurality of grid plates spaced apart from each other and arranged substantially parallel to each other, and both arc drive coils are each formed into a one-turn annular shape and are spaced apart from each other with a fixed contact in between. Characteristic arc extinguishing device. (2) The fixed contact plate, arc drive coil, and fixed terminal plate shall be integrally formed by bending an elongated conductive sheet metal with a substantially U-shaped cutout window in the center. An arc extinguishing device according to claim 1, characterized in that: