JPH01294320A - Contact maker device of electric switch - Google Patents

Abstract

PURPOSE:To reduce the damage of main contacts by inserting a movable side arc horn in the slit of a fixed side arc horn without contacting prior to the contact of the main contacts in the throwing-in process, and releasing the movable side arc horn from the slit of the fixed side arc horn after the main contacts are separated in the breaking process. CONSTITUTION:In the throwing-in process, a movable side arc horn 112 is inserted in the slit 111a of a fixed side arc horn 111 earlier than the contact of a fixed and a movable main contacts 102 and 104, and a large current throwing-in capability is secured. And when the circuit is cut off, the side surface 112a of the movable side arc horn 112 is released from the slit 111a of the fixed side arc horn 111 after the opening of the movable main contact 104 progresses, and the arc induced between the fixed side arc horn 111 and the movable side arc horn 112 is extended. It is divided by plural arc extinguish plates 113 of an arc extinguish device 115 provided at the upper side of the fixed side arc horn 111, and cooled to be extinguished. A damage of main contacts owing to the arc can be reduced, consequently.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a contact device for an electrical switch, and particularly relates to a contact device for an electrical switch, circuit breaker, etc. equipped with a pair of arcing horns. be.

BACKGROUND ART Conventionally, in order to reduce arcing between the main contacts and prevent damage to the main contacts due to arcing to improve interrupting performance, in switches or circuit breakers that interrupt relatively large currents, the main contacts A contact device including an arc contact and an arc contact is used. For example, in FIGS. 7 and 8 of the drawings, a conventional device with arcing contacts is shown in plan and side sectional view, with a first fixed terminal conductor 1 and a second fixed terminal conductor 2 spaced apart from each other. A fixed main contact 3 and a fixed arc contact 4 are attached to the first fixed terminal conductor 1 to form a fixed contact device.

The movable contact subbag W5 includes a movable main contact 7 having a movable main contact 6 mounted so as to come into contact with and away from the fixed main contact 3, and a movable arc contact mounted so as to come into contact with and separate from the fixed arc contact 4. 8 and movable arc contacts 9 are arranged in parallel with each other, and the movable arc contacts 9 are arranged so as to protrude more forward than the movable main contacts 7 provided on both sides, and are brought into contact by a common shaft 10. It is integrally attached to the child support device 11.

A second fixed terminal conductor 2 is connected to the tail ends of the movable main contactor 7 and the movable arc contactor 9 via flexible conductors 12.13, respectively, and each movable contactor 7.9 and the contactor support device A spring 14.15 is installed between the main contact 3.6 and the arc contact 4.8, applying contact pressure to the main contact 3.6 and the arc contact 4.8. The contact support device W 11 is pivotally supported by a rotating shaft 16 supported by a fixed frame (not shown), and the contact support device 11 has a pin 17.
The opening/closing operation mechanism including the opening/closing link 18 connected to the opening/closing link 18 is rotated to the opening/closing position about the rotation shaft 16 as a fulcrum. An insulating crossbar 19 mounted on the upper part of the contact support device is connected to the contact support device 11 of the other pole so that each pole of the circuit breaker operates together. Providing arcing contacts 4.8 in this manner necessarily increases the size of the contact device.

Next, FIG. 9 shows a side sectional view of another conventional device in which a pair of arcing horns are provided at the main contacts.

A movable main contact has a fixed main contact 32 provided on the bent upper piece 31a of the fixed contact 31, and a movable main contact 34 mounted on the movable side contact subbag M33 so as to come into contact with and separate from the fixed main contact 32. The child 35 is rotatably supported by a common shaft 37 at one end of the contact support device 36 . The other end of the contact device 36 is an insulating cross spar 38 that interlocks the other pole.
is connected to. The movable contactor 35 is always biased in the closing direction by a contactor spring 39 wound around a common shaft 37, and one end of a flexible conductor 40 is connected to the tail end.

A pair of arcing horns is formed by a tip 31b of an upper side 31a extending toward the tip from the fixed main contact 32 of the fixed contact 31, and a movable arc horn 41 provided so as to extend toward the tip from the movable main contact 34. There is.

The movable contact device 33 is rotated to the open/close position about the axis of the cross spar 38 as a fulcrum by the movement of an opening/closing mechanism including a link 42 connected by a common shaft 37. An upper link 43 is connected to the upper end of the link 42 via a shaft 44 to constitute a toggle link mechanism.
One end of an upper link 43 is connected to the upper end of 2 via a shaft 44, and the other end of the upper link 43 is connected to the center of a trip lever 45 by a toggle link shaft 46.
2.43 forms a toggle link. One end of the trip lever 45 is rotatably supported by a trip lever shaft 47 that is supported by a fixed frame, and the other end 45a is provided so as to be engageable with and disengageable from the main hook 48. In these pair of toggle links 42 and 43, an extension line connecting the shafts 37 and 44 of the link 42 and the shaft 44 of the link 43
The angle formed by the extension line connecting the axis 46 and the toggle link 4
It is called the bending angle θ of 2.43. On the other hand, in switchgear that needs to close a short circuit, various link mechanisms are used as the opening/closing mechanism to ensure sufficient closing force, and are able to withstand the electromagnetic force generated from the moment the switch is closed. There is a need for a small operating mechanism that can be constructed or to safely turn on a circuit with a small operating power, and the toggle link mechanism is most widely used. In order to achieve the above purpose, these link mechanisms generate a large amount of travel distance with a small amount of operating power at the start of loading, and generate a large amount of force with a large amount of work and a small amount of travel distance at the final stage of loading. is configured to do so.

For example, in a toggle link mechanism for opening and closing the movable contact device 33 as shown in FIG. 9, the bending angle θ of the pair of links 42 and 43 decreases as closing approaches, and the closing force increases. In a mechanism that allows the bending angle θ of the pair of links 42 and 43 to reach zero, when the bending angle θ is zero, the amount of change in moving distance (throwing speed) is zero,
The input power reaches infinity. Therefore, in order to obtain a large closing force, it is necessary to design the bending angle θ of the toggle link at the contact starting point to be as small as possible.

Problems to be Solved by the Invention In addition, it is necessary to secure a wipe amount in the contactor to ensure reliable contact even if contact wear occurs due to arcing or mechanical friction. The design must allow for a small amount of change in the bending angle θ of the toggle link after the start of contact, and if the bending angle θ at the contact start point is large, the repulsive force between the contacts will act as a large reaction force and the opening/closing operation will be difficult. This is transmitted to the mechanism, reducing the ability to apply large current. In order to prevent this, the opening/closing mechanism must also be made larger.

In addition, in a switch that includes a main contact that interrupts a relatively large current and an arc contact, the arc contact is provided so that it makes contact earlier than the main contact, so the amount of wipe of the arc contact must be increased, and the arc contact The bending angle θ of the toggle link at the moment of contact needs to be larger than that in the case of only the main contact, which has the disadvantage of reducing the ability to apply large current.

In addition, in a conventional contactor device having an arcing horn at the main contact as shown in Fig. 9, the gap between the arcing horns is wider than the gap between the main contacts, so the drawback is that the arc is difficult to move quickly. It was done.

That is, as will be explained below using the characteristic diagrams shown in FIGS. 10 to 14, FIGS. The force characteristics and the breaking characteristics during the breaking process are shown, and Figures 12 and 13 show the closing force characteristics during the closing process and the breaking characteristics during the breaking process of a contactor with an arcing horn only at the main contact of a conventional device. Figures 12 and 14 show the closing force characteristics during the closing process and the breaking characteristics during the closing process of this invention, which is equipped with a new arc horn only at the main contact. 6. Note that FIG. 12 can be commonly applied to systems using only main contacts. In these drawings, the horizontal axis shows the time from opening to closing, or the time from closing to opening, and the vertical axis shows the bending angle of the toggle link, the stroke of the movable contact, and the closing force. The middle line is the characteristic line showing the bending angle of the toggle link, ■ is the stroke characteristic curve of the main contact, ■ is the stroke characteristic curve of the arc contact, ■
1. represents the input force characteristic curve, and ■ represents the stroke characteristic curve of the arc horn. is the time when the arc contact is turned on, t2
is the main contact closing time, ts is the main contact opening time, t is the arc contact opening time, W is the wipe amount of the main contact, W is the wipe amount of the arc contact, G is the arc horn gap, G
1. , is the maximum gap of the arc horn, Pl is the closing force when the arc contact is closed, and P2 is the closing force when the main contact is closed.In Fig. 10, the arc contact is closed at time t1. It is understood that the input force is weak at Pl and is weak against electromagnetic repulsion due to large current. On the other hand, in FIG. 12, it can be seen that the main contact is closed at time t2, but the closing force is set to be large at P2.

On the other hand, in the breaking process, as shown in FIG. 11, the opening time t of the arc contact is delayed from the opening time t of the main contact, so that more arcing occurs than at the arc contact. In the case of FIG. 13, even if there is an arc horn, the gap between the arc horns is always longer than the gap between the main contacts, so it can be seen that the transition of the arc from the main contacts to the arc horn is not easy.

Therefore, in this invention, as shown in FIG. 12, the closing force at the time of closing the main contact is increased, and as shown in FIG. Even in the closed circuit state, a small gap of G remains, but even when the main contacts open, the gap is very small at the beginning and does not increase. It is characterized in that a region with close gaps is provided so that the arc can easily move from the main contact to the arc horn.

Therefore, an object of the present invention is to eliminate the arcing contact and provide a new arcing horn at the main contact in order to solve the problems in the prior art, so that the bending angle of the toggle link can be made small and the ability to input a large current can be increased. Another object of the present invention is to provide a contact device for an electric switch which has improved interrupting performance by quickly transferring the arc from the main contact to the arc horn.

Means for Solving the Problems Therefore, in order to achieve the above-mentioned object, a contact device for an electrical switch of the present invention includes a fixed contact and a movable contact device driven to an open/close position by a link mechanism. In an electric switch having an arc extinguishing device, the movable contact device and the fixed contact have only a main contact as a contact part, and the fixed side arc horn extending from the fixed contact has a vertical slit, The movable contact device has a thin movable arc horn that extends in the direction of the arc extinguishing device, and in the closing process, the movable arc horn comes into contact with the slit of the fixed arc horn prior to contact with the main contact. The movable arcing horn is inserted without contact, and the non-contact state is maintained even after the closing is completed, and the movable arcing horn escapes from the slit in the fixed arcing horn after the main contact is opened, or The fixed side arcing horn is plate-shaped and has a rising part that rises from the fixed contact surface and a part that bends in an L shape from the rising part, and the movable side arcing horn bends over the rising edge of the fixed side arcing horn near the closing state. It is characterized by being configured so that it is connected to the opposite ground with a small gap (separated from the ground).

1 to 3 of the drawings show an example of the present invention, in which FIG. 1 shows a contact device of a switch in an open state, and FIG. 2 shows a contact device in an open state. FIG. 3 is a side sectional view, and FIG. 3 is a perspective view of the main parts, in which the arc extinguishing device is shown separated from the contact device.

As shown in the figure, in the switch contact device of the present invention, a fixed contact 101 having a fixed main contact 102 at one end is mounted on a substrate 100 made of an insulator.
In addition, the movable main contact 1 is connected to and separated from the fixed main contact 102.
A movable contact 103 with a movable contact 103 having a
They are connected together by 7.

The movable contact support member 105 is rotatably supported by a fixed frame 108, has a stopper 110 implanted on the tip side, and has a notch 10 provided on the contact side of the movable contact 103.
As shown in FIG. 3, the fixed side arc horn 111, which is bent in a horizontal ■ shape so as to approach the fixed main contact 102 of the six fixed contacts 101 that correspond to the 6 fixed contacts 101, has a vertical direction as shown in FIG. A slit 1lla is provided, and a movable arc horn 112 is correspondingly provided to be inserted into the slit 111a when the circuit is closed. The movable arc horn 112 on the thin plate is attached to the movable contact support member 10
5, and the tip is a fixed and movable main contact 102
．． It is formed to protrude from the arc horn 104 in the direction of the fixed arc horn 111. Arc extinguishing plates 113 made of a plurality of rectangular magnetic bodies having cutout portions 113a through which the movable arc horn 112 can be moved are stacked at intervals so as to be stacked on top of the fixed arc horn 111. Arc extinguishing devices 115 are arranged to be held side by side and insulated on support plate 114 . At the lower part of this arc extinguishing device 115, a mounting bracket 11 for attaching the arc extinguishing device 115 is temporarily installed across a pair of support plates 114.
6 is provided in correspondence with a latching member 111b integrally formed on the fixed side arc horn 111, so that it can be latched and unlatched freely. Further, one end of a flexible conductor 117 is connected to the tail end of the movable contactor 103, and the other end is connected to the connecting terminal 1.
It is connected to one end of 18 with a screw 119.

The spring means 120 that applies contact pressure to the movable contact 103 is divided into a relatively weak first spring 120a and a relatively strong second spring 120b. A torsion spring is mounted so as to wind around the shaft 109, and one end of the frame is provided at the tail end of the movable contact 103, and the other end is connected between the bottle 121 and the fixed member 12'2. It is temporarily installed and is operable in both open and closed positions. Furthermore, the second spring 120b presses the pressing member 12 onto the tail end of the movable contact 103.
The pressing member 12 is temporarily installed between the head of the device 3 and the substrate 100.
3 is movably supported through the substrate 100, and the pressing member 123 is normally pushed up to a predetermined position limited by a stopper pin 123a provided at the lower end by the acting force of a spring 120b. This pressing member 12
3 acts only in the contact direction on the movable contact 103 immediately before the movable contact 104 contacts the fixed contact 103. The upper end of the lower operating link 106 is connected to the upper operating link 125 by a connecting shaft 124 to form a toggle link mechanism. This upper operation link 125 is connected to the fixed frame 10
8 is rotatably supported by a shaft 126, and the fixed frame 10
A guide bin 127 installed on the link 125 is fitted into the guide m 108a provided on the link 125. Furthermore, a cross spar 128 is provided which rotates the multi-poles together by an opening/closing W mechanism (not shown) provided separately. 125 is opened and closed by rotating around a shaft 126.

Now, as shown in Figure 1, the circuit is opened and closed 1! When the cross par 128 is rotated counterclockwise by the side,
The link 125 integrally slides the guide bin 127 along the guide eraser 108a with the rotation shaft 126 as a fulcrum, pulls up the lower link 106, and moves the movable contact support member 105.
is rotated clockwise about the rotation shaft 109, resulting in a closed circuit state as shown in FIG.

In the above contact device, when the movable contact device changes from open circuit to closed circuit at the time of closing, the movable side arc horn 112, which is provided so as to protrude from the movable main contact 104 toward the arc extinguishing device 115, is fixed and movable. Main contact 102.10
Although the movable arc horn 112 is inserted into the slit 111a of the fixed arc horn 111 earlier than the fixed arc horn 111 makes contact with the fixed arc horn 111, the fixed and movable main contacts 102. The bending angle θ of the toggle link at the contact start point 104 can be made smaller than that provided with an arc contact. Therefore, at this point, the connecting shaft 107 and the rotating shaft 126 of the toggle link 121, 125 are fairly close to a straight line, so the closing force is large and the fixed and movable main contacts 102, 104
Even if it is subjected to a large current electromagnetic repulsive force, the repulsive force is overcome and the large current input capability is ensured. In addition, the generation of an arc when turning on is possible if the space between the fixed and movable main contacts 102 and 104 is clean.For example, if the voltage between the electrodes is 500μ, the arc will not occur unless the voltage between the electrodes is about 0.05zz or less. If the closing speed is set to 1ax/m5ec, contact will start 50 μsec after arcing, so if the contact bounce does not occur, the arc will disappear. Therefore,
Fixed and movable main contacts 102, 104 can be closed without significant damage.

Next, when breaking, it is necessary to consume the electromagnetic energy stored in the circuit, so an arc is unavoidably generated between the fixed and movable main contacts 102 and 104, but the movable contact device When moving from a closed circuit to an open circuit, when the movable main contact 104 starts to open from the fixed main contact 102, the arc generated between the fixed and movable main contacts 102 and 104 remains between the fixed and movable main contacts for a short period of time when the opening distance is short. This occurs between the movable main contacts, but as the separation distance increases, the withstand voltage value is lower than that between the fixed and movable main contacts, where the distance between the electrodes is short, that is, the relatively long side surface of the movable arc horn 112. 112a and the groove edge 111C of the slit of the fixed side arc horn 111, and after the arc smoothly moves to the small gap between the movable main contact 104 and the opening of the movable main contact 104, the side surface 112a of the movable side arc horn 112 moves to the fixed side. If the arc escapes from the slit 111a of the arc horn 111 and the separation distance further increases, the arc attracted between the fixed arc horn 111 and the movable arc horn 112 will be extended, and the upper part of the fixed arc horn 111 will be extended. The arc extinguishing plates 113 of the arc extinguishing bag M115 arranged in Damage can be reduced and blocked.

4 to 6 show other embodiments, FIG. 4 is a closed circuit state, FIG. 5 is an open circuit state, and FIG. 6 is a side sectional view showing an intermediate process of opening and closing. , The same parts as those in the embodiment shown in FIGS. 1 to 3 are given the same reference numerals, and the different parts will be explained. The fixed arc horn 200 is plate-shaped, bent into a V shape, and has no slit. , a rising portion 200a rising from the surface of the fixed contact 101, and a running portion 20 bent into an L shape from this rising portion 200a.
0b is formed.

In addition, in the movable contact 103 having the movable main contact 104, the movable side arc protrudes from the N movable main contact 104 by forming a slight gap with the rising portion 200a of the fixed side arc horn 200 following the notch 103a. A horn 201 is integrally provided.

Even with the above configuration, the movable arc horn 201, which is provided to protrude from the movable main contact 104 toward the arc extinguishing device 115, does not come into contact with the fixed arc horn 200; By reducing the bending angle θ of the toggle link at the contact start point of the main contacts 102 and 104, it is possible to increase the closing force of the fixed and movable main contacts 102.

In addition, when disconnecting, the fixed and movable main contacts 102.
The arc generated between the arcs 104 and 104 quickly moves to a small gap between the fixed arc horn 200 and the movable arc horn 201. As the movable main contact 102 continues to separate, the movable arc horn 201 separates from the rising portion 200a of the opposing fixed arc horn 200, and the fixed arc horn 200
The magnetic field caused by the current flowing through the arc acts on the arc and produces a blow-out effect, and as the separation distance increases, the arc is rapidly expanded and is cooled in sections by the plurality of arc extinguishing plates 113 of the arc extinguishing device 115 and extinguished. Since this leads to an arc, arcing between the fixed and movable main contacts is reduced, and damage to the fixed and movable main contacts due to arc is reduced and can be interrupted.

Effects As described above, in this invention, the arc contact is eliminated,
A new arcing horn is provided for the fixed and movable main contacts, and in the closing process, the movable side arcing horn is inserted into the slit of the fixed side arcing horn without contacting it before the fixed and movable main contacts come into contact, and the closing is completed. A non-contact state is maintained even when the main contact is closed, and when the main contact is broken, the movable arc horn escapes from the slit in the fixed arc horn after the fixed and movable main contacts are opened. This has the effect of increasing the current input capability and speeding up the transition of the arc from the fixed and movable main contacts to the arc horn, thereby reducing damage to the fixed and movable main contacts.

[Brief explanation of the drawing]

An embodiment of the present invention is shown in FIGS. 1 to 3, in which FIG. 1 is a side sectional view of a contact device of a switch showing a closed circuit state, FIG. 2 is a side sectional view of a contact device of a switch showing an open circuit state, and FIG. The figure is a perspective view of the main part, and Figures 4 to 6 show other embodiments of the invention. Figure 4 shows the closed circuit state, Figure 5 shows the open circuit state, and Figure 6 shows the open and closed circuit state. 7 and 8 are plan views and side sectional views of a conventional device equipped with an arc contact, and FIG. 9 shows a conventional device equipped with a pair of arc horns at the main contact. The side sectional views, FIGS. 10 to 14, are characteristic diagrams of the contactor device of an electrical switch, and FIGS. 10 and 11 show the process of closing a contactor equipped with an arc contact and a main contact of the conventional device. Figure 1 shows the input force characteristics and the breaking characteristics during the breaking process.
Figures 2 and 13 are diagrams showing the closing force characteristics during the closing process and the breaking characteristics during the breaking process of a contactor with an arc horn provided only at the main contact of a conventional device. FIG. 3 is a diagram showing the closing force characteristics during the closing process and the breaking characteristics during the breaking process of the present invention, which is equipped with a novel arc horn only at the contact point. In the figure, 100: substrate, 101: peripheral contact, 102:
Fixed main contact, 103: Movable contact, 104: Movable main contact, 105: Movable contact support member, 106: Operation link,
108: Fixed frame, 108a Ni guide mechanism, 110: Stopper, 111.200: Fixed side arc horn, 111a
Nisritsu, 1llb: Latching member, 112.201:
Movable side arc horn, 113: arc extinguishing plate, 113a: notch, 114: support plate, 115: arc extinguishing device, 116: hanging metal fitting, 120: spring means, 120a, 120b: spring, 125: operation link, 127 :Guide bin, 128:
Crossbar, 129: opening/closing arm, 200a + rising part,
200b: Traveling part. Patent applicant Terasaki Electric Industry Co., Ltd. Patent attorney Teru Soga Michi ゝ,,d.
Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 10 Bargain 36 Fig. 12 Open day 'ζdo 6

Claims (2)

[Claims] (1) In an electric switch having a fixed contact, a movable contact device driven to an open/close position by a link mechanism, and an arc extinguishing device, the movable contact device and the fixed contact have only a main contact as a contact part. The fixed side arc horn extending from the fixed contact has a vertical slit, and the movable contact device has a thin movable side arc horn extending in the direction of the arc extinguishing device. In the process, the movable side arcing horn is inserted into the slit of the stationary side arcing horn without contacting it before the main contact comes into contact, and the non-contact state is maintained even when the closing is completed, and after the main contact is opened at the time of disconnection. A contact device for an electric switch, characterized in that a movable arc horn escapes from a slit in the fixed arc horn. (2) In an electric switch having a fixed contact, a movable contact device driven to an open/close position by a link mechanism, and an arc extinguishing device, the movable contact device and the fixed contact have only a main contact as a contact part. The fixed side arc horn extending from the fixed contact is plate-shaped and has a rising portion rising from the fixed contact surface and a portion bent in an L shape from the rising portion, and the movable contact device has the above-mentioned A movable arcing horn is provided opposite the rising portion of the fixed arcing horn with a small gap, and during the closing process, the tip of the movable arcing horn comes into contact with the rising portion of the fixed arcing horn prior to contact with the main contact. The movable arcing horn approaches the rising part of the stationary arcing horn from the state facing the rising part of the fixed arcing horn after the main contact is opened at the time of disconnection. An electrical switch contact device characterized by: