JP3778081B2 - Arc extinguishing device and on-vehicle switch using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an arc extinguishing device for extinguishing an arc, and a vehicle-mounted switch using the arc extinguishing device.
[0002]
[Prior art]
In the future, demand for electric vehicles is expected to grow significantly. The current flowing through the DC switch is generally unidirectional. However, for example, in a vehicle-mounted switch used in an electric vehicle, a two-way direct current flows for discharging and charging a motor driving power source. Further, since regeneration from the motor to the power source is performed during deceleration of the electric vehicle, a current in the direction opposite to the normal direction flows through the on-vehicle switch.
[0003]
By the way, it is pointed out that a direct current is more difficult to cut off than an alternating current because there is no current zero point. Therefore, the on-vehicle switch is required to improve the breaking performance. The structure of the arc extinguishing device is particularly important because it directly affects the breaking performance of the switch.
[0004]
FIG. 9 is an electric circuit diagram schematically showing a main circuit of the electric vehicle. 101 is a power source, 102A and 102B are switches as a vehicle-mounted switch, 103 is a vehicle-mounted charger, 104 is a capacitor, 105 is an inverter, and 106 is a motor. In an electric vehicle, when the accelerator is depressed, a direct current from the power source 101 flows in the direction of the switch 102A, the inverter 105, and the switch 102B. The inverter 105 converts the supplied direct current into an alternating current. This alternating current flows through the motor 106 and the car starts to move. In this state, the battery of the power source 101 is discharged, and charging is required when the amount of discharge from the power source 101 reaches a predetermined amount.
[0005]
When the power supply 101 is charged, the motor 106 is electrically disconnected from the power supply 101 due to the suspension of the operation of the inverter 105, and sequentially passes through the switch 102A, the power supply 101, and the switch 102B from the in-vehicle charger 103 connected to the charging power supply. Then, charging is performed. During charging, the switches 102A and 102B pass a current (hereinafter referred to as a reverse current) in a direction opposite to a current (hereinafter referred to as a forward current) flowing during discharge. Accordingly, the switches 102A and 102B are required to cut off the reverse current in addition to the forward current.
[0006]
In addition, when a short-circuit accident occurs in the inverter or the motor during energization or charging, a large current of 3 to 10 times the normal value flows. In some cases, more current flows. Therefore, in-vehicle switches are required to cut off a large current in the reverse direction in addition to a large current in the positive direction. In addition, an example of the electric current of the normal time which a vehicle-mounted switch interrupts | blocks is voltage value 300-400V, and current value 50-200A. In addition, a maximum current of about 2500 A may flow during a short circuit.
[0007]
FIG. 10: is a partially broken front view of the arc-extinguishing apparatus during discharge or charge about the conventional vehicle-mounted switch. 111A and 111B are fixed contacts, and 112A and 112B are movable contacts. 113A and 113B are fixed contacts having fixed contacts, and 114 is a movable contact having movable contacts at both ends. 115 is an insulating rod as an operation member, 116 is an arc extinguishing chamber case, 116C is a hole provided in the arc extinguishing chamber case for penetrating the insulating rod, and 117A and 117B are permanent magnets. In FIG. 10, the permanent magnet 117A is magnetized with the N pole on the front side of the paper and the S pole on the back side of the paper, and the permanent magnet 117B is also magnetized with the N pole on the front side of the paper and the S pole on the back side of the paper. .
[0008]
It is assumed that the fixed contact 113A is electrically connected to the power source side and the fixed contact 113B is electrically connected to the motor side as a load. The positive current flows from the fixed contact 113A in the direction of the fixed contact 113B via the fixed contact 111A, the movable contact 112A, the movable contact 114, the movable contact 112B, and the fixed contact 111B. The reverse current flows in the opposite direction. When the current is interrupted, the insulating rod is activated to push up the movable contact 114 upward in the drawing. As a result, the fixed contact 111A and the movable contact 112A are separated, and the fixed contact 111B and the movable contact 112B are separated.
[0009]
FIG. 11 is a partially cutaway front view of the arc extinguishing device in a state where the contact is opened to cut off the forward current. An arc is generated between the two separated contacts, and a positive current flows through each arc. In addition, since the magnetic field lines are generated from the N pole and reach the S pole, the magnetic field between the separated contacts is directed from the front side of the paper toward the back side. Here, according to Fleming's left-hand rule, a driving force is generated on the left side of the sheet when the arc is generated between the fixed contact 111A and the movable contact 112A, and on the right side of the sheet when the arc is generated between the movable contact 112B and the fixed contact 111B. Works. By this driving force, the arc is bent and stretched as shown in FIG. The arc is thus extended by the arc length and cooled by the surrounding air, whereby the arc resistance is increased and the current is greatly limited. When the current is limited to a region where the current-voltage characteristic of the arc is negative, the current is interrupted.
[0010]
Next, a case where the reverse current is interrupted will be described. FIG. 12 is a partially broken front view of the arc extinguishing device in a state in which the contact is opened to interrupt the reverse current. A reverse current flows through each arc generated between the two separated contacts. Further, the magnetic field between the separated contacts is directed from the front side of the paper toward the back side. According to Fleming's left-hand rule, a driving force acts on the right side of the paper on the arc generated between the fixed contact 111A and the movable contact 112A, and on the left side of the paper on the arc generated between the movable contact 112B and the fixed contact 111B. To do. By this driving force, the arc is stretched as shown in FIG.
[0011]
[Problems to be solved by the invention]
However, the insulating rod 115 becomes an obstacle at the point where the arc is stretched, and the degree of arc extension is small. Therefore, the increase in arc resistance is insufficient, and a large current cannot be interrupted when a short-circuit accident occurs.
[0012]
Further, since the insulating rod 115 is usually made of resin, it carbonizes when it is thermally damaged by the arc. When the reverse current is repeatedly interrupted, the surface of the insulating rod 115 becomes conductive due to the progress of carbonization. Therefore, the arc current flows through the surface of the insulating rod, and even normal current cannot be interrupted.
[0013]
The present invention has been made to solve such a problem, and can cut off two-way direct current flowing during discharging and charging, particularly when a large current flows in the opposite direction due to a short circuit accident during charging. An arc extinguishing device that improves the breaking performance and further prevents the breaking performance from being deteriorated in repeated breaking of reverse current, and a vehicle-mounted switch using the arc extinguishing device.
[0014]
[Means for Solving the Problems]
  An arc-extinguishing device according to claim 1 is an arc-extinguishing device for extinguishing an arc generated when current is interrupted by opening the contact. The arc-extinguishing device includes a fixed contact and a movable contact, and the movable contact has the movable contact. A contact member, an operation member connected to the movable contact member to open the contact point, and a magnetic field generation unit that generates a magnetic field in the vicinity of the contact point. The magnetic field generation unit is configured to operate the operation member. Generating a magnetic field in a direction parallel to a direction from the movable contact toward the operation member between the separated fixed contact and the movable contact;The movable contact includes a pair of protrusions extending in the same direction as the opening operation with a side portion of the movable contact as a base point;It consists of a non-magnetic material for cooling the arc in two directions perpendicular to the direction of the magnetic field and perpendicular to the direction of separation, and starting from the fixed contact.All ofArc extinguishing gridFrom the tip of the protrusion to the fixed contact sideIt is arranged.
[0017]
  Claim2The arc-extinguishing apparatus according to the present invention includes a first contact composed of a first fixed contact and a first movable contact, a second contact composed of a second fixed contact and a second movable contact, the first movable contact and the first movable contact at both longitudinal ends. An elongated movable contact having two movable contacts, first magnetic field generating means for generating a magnetic field in the vicinity of the first contact, and second magnetic field generating means for generating a magnetic field in the vicinity of the second contact The first magnetic field generating means and the second magnetic field generating means have the same magnetic pole direction.
[0018]
  Claim3The arc extinguishing device according to the present invention further comprises a magnetic force line induction member made of a magnetic material so as to follow the magnetic force lines generated from the first magnetic field generating means and the second magnetic field generating means and passing through the first contact and the second contact. It is arranged.
[0020]
  Claim4The on-vehicle switch according to the present invention includes a first fixed contact and a first movable contact in an on-vehicle switch that cuts off a current flowing for discharging or charging between a power source and a load by opening the contact. A second contact comprising a first contact, a second fixed contact and a second movable contact, an elongated movable contact having the first movable contact and the second movable contact at both ends in the longitudinal direction, and connected to the movable contact An operating member for separating the first contact and the second contact, a first magnetic field generating means for generating a magnetic field in the vicinity of the first contact, and a magnetic field in the vicinity of the second contact. Second magnetic field generating means, wherein the first magnetic field generating means is disposed between the first movable contact and the first movable contact between the first fixed contact and the first movable contact that are opened when the operation member is operated. Magnetic field parallel to the direction toward the operating member The second magnetic field generating means is a direction from the second movable contact toward the operation member between the second fixed contact and the second movable contact that are opened when the operation member is operated. Generate a magnetic field in a direction parallel toThe movable contact includes a pair of protrusions extending in the same direction as the opening operation from the side of the first movable contact as a base point, and the opening operation from the side of the second movable contact as a base point. A pair of protrusions extending in the same direction,It is made of a nonmagnetic material in two directions that are perpendicular to the direction of the magnetic field and perpendicular to the direction of the separation, with the first fixed contact as a starting point.All ofFirst arc extinguishing gridIt is arranged on the first fixed contact side from the tip of the protrusion on the first movable contact side., Made of non-magnetic material in two directions starting from the second fixed contactAll ofThe second arc extinguishing gridFrom the tip of the protrusion on the second movable contact side to the second fixed contact sideAn arc extinguishing device is used in which the first magnetic field generating means and the second magnetic field generating means have the same magnetic pole direction.
[0021]
  Claim5The on-vehicle switch according to the present invention includes a magnetic field induction made of a magnetic material so as to follow the magnetic field lines generated from the first magnetic field generating means and the second magnetic field generating means and passing through the first contact and the second contact. Place partsdidAn arc extinguishing device is used.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a partially broken front view for explaining Embodiment 1 in an arc extinguishing apparatus to which the present invention is applied. An arc extinguishing device 10 is used to extinguish an arc generated when the current flowing between the power source and the load is interrupted by opening the contact. 1A is a fixed contact as a first fixed contact, 2A is a movable contact as a first movable contact, and both constitute a first contact. Similarly, 1B is a fixed contact as a second fixed contact, 2B is a movable contact as a second movable contact, and both constitute a second contact. 3A is a first fixed contact and has a fixed contact 1A. Similarly, 3B is a second fixed contact and has a fixed contact 1B. Reference numeral 4 denotes an elongated rectangular parallelepiped movable contact having movable contacts 2A and 2B at both ends. Specifically, the movable contact is joined to the movable contact, and the fixed contact is joined to the fixed contact. Here, although an example of joining is given, these may be constituted by one member. Reference numeral 5 denotes an insulating rod made of resin as an operating member, which is connected to the movable contact 4 to open the first contact and the second contact. 6 is a ceramic arc extinguishing chamber case, and 6C is a hole provided in the arc extinguishing chamber case for allowing the insulating rod 5 to pass therethrough. 7A is a permanent magnet as a first magnetic field generating means for generating a magnetic field in the vicinity of the first contact, and 7B is a permanent magnet as a second magnetic field generating means for generating a magnetic field in the vicinity of the second contact. Arranged on the upper inner wall of the arc chamber case 6. In FIG. 1, the directions of the magnetic poles of the permanent magnet 7A and the permanent magnet 7B are the same, and both the N pole is magnetized on the left side of the paper and the S pole is magnetized on the right side of the paper.
[0023]
The lines of magnetic force generated from the permanent magnet 7A reach the S pole of the permanent magnet 7B from the N pole via the first contact and the second contact that are opened by the operation of the insulating rod 5. Therefore, the magnetic field between the fixed contact 1A and the movable contact 2A is parallel to the direction from the movable contact 2A toward the insulating rod 5 as indicated by the arrow H, and is directed from the left side to the right side of the drawing. Similarly, as indicated by an arrow H, the magnetic field between the fixed contact 1B and the movable contact 2B is parallel to the direction from the movable contact 2B toward the insulating rod 5, and is directed from the left side to the right side of the drawing.
[0024]
It is assumed that the fixed contact 3A is electrically connected to the power source side and the fixed contact 3B is electrically connected to the motor side as a load. The positive current flows from the fixed contact 3A in the direction of the fixed contact 3B via the fixed contact 1A, the movable contact 2A, the movable contact 4, the movable contact 2B, and the fixed contact 1B. The reverse current flows in the opposite direction. At the time of current interruption, the insulating rod 5 is actuated to push up the movable contact 4 upward in the drawing. Thereby, the fixed contact 1A and the movable contact 2A are separated, and the fixed contact 1B and the movable contact 2B are separated.
[0025]
The arrangement position of the permanent magnet may be the upper outer wall, the lower outer wall, or the side part of the arc extinguishing chamber case, and can be appropriately selected according to the design of the arc extinguishing device. In addition, when the first magnetic field generating means and the second magnetic field generating means form a continuous magnetic field, for example, by using a long permanent magnet, the first magnetic field generating means and the second magnetic field generating means May be composed of one magnet.
[0026]
The gap between the arc-extinguishing chamber case 6 and the insulating rod 5 may be sealed by inserting a cylindrical member called a bellows into the hole 6C of the arc-extinguishing chamber case, whereby the arc-extinguishing chamber can be sealed. . In this case, since the contact corrosive gas can be prevented from entering the arc extinguishing chamber from the outside, the contact reliability of the contact can be improved. Also. A gas that contributes to improvement of arc extinguishing performance such as hydrogen may be enclosed in the sealed arc extinguishing chamber.
[0027]
A case where the positive current is interrupted will be described. In FIG. 1, an arc is generated between two separated contacts, and a positive current flows through each arc. The magnetic field between the fixed contact 1A and the movable contact 2A is from the left side to the right side, and the magnetic field between the fixed contact 1B and the movable contact 2B is also from the left side to the right side. Here, according to Fleming's left-hand rule, a driving force acts on the back side of the paper on the arc generated between the fixed contact 1A and the movable contact 2A. By this driving force, the arc is bent and extended toward the back side of the drawing. Similarly, a driving force acts on the front side of the paper on the arc generated between the movable contact 2B and the fixed contact 1B, and the arc is bent and stretched toward the front side of the paper.
[0028]
FIG. 2 is a partially broken top view for explaining the arc extinguishing device according to the first embodiment, as seen from the top of how the arc is stretched. In FIG. 2, when the positive current is interrupted, the arc is drawn upward in the figure at the first contact and downward in the figure at the second contact, as indicated by a solid line. There are no obstacles to arc extension in these directions. The arc is thus extended by the arc length and cooled by the surrounding air, whereby the arc resistance is increased and the current is greatly limited. When the current is limited to a region where the current-voltage characteristic of the arc is negative, the current is interrupted.
[0029]
Next, a case where the reverse current is interrupted will be described. In FIG. 1, a reverse current flows through each arc generated between two separated contacts. Since the current direction is opposite to that in the case of the forward current, the driving force acts on the front side of the paper on the arc generated between the fixed contact 1A and the movable contact 2A, and the arc is on the front side of the paper. It is bent and stretched toward. Similarly, the arc generated between the movable contact 2B and the fixed contact 1B is bent and stretched toward the back side of the drawing. That is, in FIG. 2, when the reverse current is interrupted, the arc is stretched downward in the drawing at the first contact and upward in the drawing at the second contact, as indicated by a broken line. There are no obstacles to arc extension in these directions. Therefore, the current is cut off as in the case of the positive current.
[0030]
Here, in order to sufficiently stretch the arc, it is desirable that the magnetic field strength is high. For example, in an arc extinguishing apparatus that cuts off a current having a voltage value of 300 to 400 V and a current value of 50 to 200 A at normal times, the magnetic field strength is about 300 gauss, for example.
[0031]
Thus, in this embodiment, the arc is sufficiently stretched regardless of the forward current and the reverse current. In other words, the insulating rod becomes an obstacle at the point where the arc is stretched as in the prior art, and the degree of arc extension is not reduced. Therefore, the current in two directions can be cut off.
[0032]
Moreover, the arc does not touch the resin insulating rod. Therefore, the insulating rod does not carbonize and carbonization deterioration of the insulating rod can be prevented. Therefore, it is possible to prevent the normal current interruption performance from being lowered.
[0033]
Furthermore, since the first magnetic field generating means and the second magnetic field generating means have the same magnetic pole direction, the arc driving directions are different between the first contact and the second contact, as can be seen from FIG. That is, in FIG. 2, when the arc is stretched upward in the figure at the first contact, the arc is stretched downward in the figure at the second contact. For this reason, there is no risk of dielectric breakdown between the arcs even in the case of a large current interruption in the case of a short circuit accident as well as the interruption of the normal current, and the dielectric breakdown between the fixed contact 1A and the fixed contact 1B, for example, Will not cause. Therefore, the interruption performance of a large current can be improved. However, if there is no risk of dielectric breakdown between the arcs depending on the structure or application of the arc extinguishing device, the first magnetic field generating means and the second magnetic field generating means may have different magnetic pole directions.
[0034]
According to this embodiment, it is possible to cut off the DC current in the two directions of the forward direction and the reverse direction, and in particular, it is possible to improve the breaking performance of a large current when a short circuit accident occurs in the energized state in the reverse direction. Furthermore, it is possible to provide an arc extinguishing device that prevents a reduction in interruption performance in repeated interruption of reverse current.
[0035]
Furthermore, by mounting an on-vehicle switch equipped with this arc extinguishing device as a current interrupting mechanism in an electric vehicle as shown in FIG. 9, the normal current can of course be applied in either the forward or reverse energized state. In addition, the interruption performance can be improved for a large current when a short circuit accident occurs.
[0036]
Embodiment 2. FIG.
FIG. 3 is a partially broken front view for explaining the second embodiment. FIG. 4 is a partially broken top view. In this embodiment, an arc extinguishing grid is arranged in the vicinity of the contact point in the first embodiment. Reference numeral 10 denotes an arc extinguishing device. 1A and 1B are fixed contacts, 2A and 2B are movable contacts, 3A and 3B are fixed contacts, 4 is a movable contact, 5 is an insulating rod as an operation member, 6 is an arc extinguishing chamber case, and 6C is an arc extinguishing chamber case 7A and 7B are permanent magnets, 8A is an arc extinguishing grid as a first arc extinguishing grid, and 8B is an arc extinguishing grid as a second arc extinguishing grid.
[0037]
The arc extinguishing grid is for cooling the arc. The arc extinguishing grid is a direction defined by a direction perpendicular to the direction of the magnetic field generated in the vicinity of the contact and a direction perpendicular to the direction of opening of the contact, and two directions with the fixed contact as a starting point Placed in. Here, geometrically, a straight line passing through one arbitrary point and perpendicular to two directions is defined as one straight line. If one point on the straight line is used as a base point, two directions parallel to the straight line are defined. That is, if it demonstrates using FIG. 4, the two directions which arrange | position an arc-extinguishing grid are a paper surface upper side and a paper surface lower side from a fixed contact. If these two directions are included, a U-shaped one member may be used as in the arc extinguishing grids 8A and 8B shown in FIG. Of course, you may arrange | position as a separate member on the paper surface upper side and paper surface lower side.
[0038]
The arc extinguishing grid 8A is desirably placed at a distance of 1 to 5 mm from the fixed contact 1A, and particularly desirably placed at a distance of 2 to 3 mm. The same applies to the arc extinguishing grid 8B and the fixed contact 1B. Further, the conventional arc extinguishing grid is made of a magnetic material such as iron, but the arc extinguishing grids 8A and 8B in this embodiment are non-magnetic. Examples of the nonmagnetic material include nonmagnetic metals such as stainless steel and copper, and nonmagnetic ceramics.
[0039]
When the arc extinguishing grid is a magnetic material, the magnetic field generated by the permanent magnet is shielded by the arc extinguishing grid of the magnetic material, and the magnetic field strength acting on the arc is greatly reduced. In this embodiment, since the arc extinguishing grids 8A and 8B are non-magnetic, the magnetic field strength acting on the arc does not decrease.
[0040]
In the first place, the arc extinguishing grid cools the arc and makes it easy to interrupt the current. Therefore, it is desirable not to reduce the strength of the magnetic field acting on the arc, and the effect of improving the interrupting performance is greater. Further, as shown in FIG. 3, the arc extinguishing grids 8A or 8B are arranged so as to overlap each other at an interval, whereby the arc is divided and the arc cooling effect is enhanced, and the current is easily interrupted. That is, the interruption performance of the arc extinguishing device is greatly improved. The number of arc-extinguishing grids can be selected as appropriate according to the design of the arc-extinguishing device. However, if the power supply voltage is 100 to 300 V, it is desirable that the number of arc extinguishing grids is 4 to 8 per contact. As a result of an experiment comparing copper and stainless steel as arc extinguishing grid materials, copper with superior thermal conductivity showed better barrier performance.
[0041]
Embodiment 3 FIG.
FIG. 5 is a partially broken front view for explaining the third embodiment. Reference numeral 10 denotes an arc extinguishing device. In this embodiment, magnetic force line guiding members are arranged so as to follow the magnetic force lines generated by the permanent magnets 7A and 7B in the first embodiment. 1A and 1B are fixed contacts, 2A and 2B are movable contacts, 3A and 3B are fixed contacts, 4 is a movable contact, 5 is an insulating rod as an operation member, 6 is an arc extinguishing chamber case, and 6C is an arc extinguishing chamber case And 7A and 7B are permanent magnets arranged on the outer wall of the arc extinguishing chamber case. 9A, 9B and 9C are magnetic force line induction members made of a magnetic material, and are made of, for example, an iron plate having a thickness of 1 to 2 mm.
[0042]
The magnetic force line guiding members 9A to 9C are arranged along the magnetic force lines generated from the permanent magnets 7A and 7B and passing through the first contact and the second contact. For example, it arrange | positions along the outer wall of an arc-extinguishing chamber case like FIG. Thus, it may be arranged so as to cover the outer wall, or may be arranged so as to be partially omitted.
[0043]
The magnetic field lines generated from the N pole of the permanent magnet 7A pass through the magnetic force line guiding member 9A, the first contact made of the fixed contact 1A and the movable contact 1B, the second contact made of the fixed contact 1A and the movable contact 1B, and the magnetic force line guiding member 9B. To the south pole of the permanent magnet 7B. The lines of magnetic force generated from the N pole of the permanent magnet 7B reach the S pole of the permanent magnet 7A via the magnetic line guide member 9C.
[0044]
By arranging the magnetic force line guiding member in this way, the magnetic resistance of the magnetic circuit is greatly reduced, so that the magnetic field strength acting on the arc can be greatly enhanced. As a result, the interruption performance of the arc extinguishing device is greatly improved.
[0045]
Embodiment 4 FIG.
FIG. 6 is a partially broken front view for explaining the fourth embodiment. In this embodiment, the movable contact in the first embodiment is provided with a protrusion. Reference numeral 10 denotes an arc extinguishing device. 1A and 1B are fixed contacts, 2A and 2B are movable contacts, 3A and 3B are fixed contacts, 4 is a movable contact, 5 is an insulating rod as an operation member, 6 is an arc extinguishing chamber case, and 6C is an arc extinguishing chamber case The holes 7A and 7B provided in are permanent magnets.
[0046]
FIG. 7 is an enlarged perspective view of a main part for explaining the fourth embodiment. 2A and 2B are movable contacts, 4 is a movable contact, and 5 is an insulating rod. Reference numeral 4A denotes a pair of protrusions forming a so-called arc horn, which extends in the same direction as the above-described opening operation, that is, upward in the figure, with the side portion of the movable contact 2A as a base point. 4B is also a pair of projections forming a so-called arc horn, and extends in the same direction as the contact opening operation, that is, upward in the figure, with the end of the movable contact 2B as a base point.
[0047]
As described above, when the movable contact 4 includes the arc horns 4A and 4B, the arc bent and stretched by the magnetic field is further extended to the tip of the arc horn. By extending the arc to the arc extinguishing grid installed at a position higher than the movable contactor position, the arc resistance is further increased and the interruption performance can be greatly improved.
[0048]
The arc horn is more effective as the contact opening distance is shorter. For example, when the contact separation distance is 2 to 5 mm, the length of the projection portion of the arc horn may be set longer, but is usually set to 3 to 5 mm.
[0049]
Embodiment 5. FIG.
FIG. 8 is a partially broken front view for explaining the fifth embodiment. This embodiment is a combination of all of the first to fourth embodiments. Reference numeral 10 denotes an arc extinguishing device. 1A and 1B are fixed contacts, 2A and 2B are movable contacts, 3A and 3B are fixed contacts, 4 is a movable contact, 4A and 4B are a pair of protrusions forming an arc horn, and 5 is an insulating rod as an operation member. , 6 is an arc extinguishing chamber case, 6C is a hole provided in the arc extinguishing chamber case, 7A and 7B are permanent magnets, 8A and 8B are arc extinguishing grids, and 9A, 9B and 9C are magnetic line induction members made of a magnetic material. .
[0050]
Since all of Embodiments 1 to 4 improve the blocking performance, they can be arbitrarily combined. By combining all as in this embodiment, the interruption performance of the arc extinguishing device is further improved.
[0051]
According to this embodiment, it is possible to cut off the DC current in the two directions of the forward direction and the reverse direction, and in particular, it is possible to further improve the breaking performance of a large current when a short circuit accident occurs in the energized state in the reverse direction. Furthermore, it is possible to provide an arc extinguishing device that prevents a reduction in interruption performance in repeated interruption of reverse current.
[0052]
Furthermore, by mounting an on-vehicle switch equipped with this arc extinguishing device as a current interrupting mechanism in an electric vehicle as shown in FIG. 9, the normal current can of course be applied in either the forward or reverse energized state. In addition, the interruption performance can be improved for a large current when a short circuit accident occurs.
[0053]
Up to this point, the arc-extinguishing device having two contacts has been described by taking an in-vehicle switch as an example, but the present invention can also be applied to an arc-extinguishing device having only one contact. For example, as an arc extinguishing device having only one contact, there is an arc extinguishing device used for a small circuit breaker for wiring.
[0054]
【The invention's effect】
  According to the present invention, in an arc extinguishing device for extinguishing an arc generated when current is interrupted by opening the contact, the contact comprising a fixed contact and a movable contact, the movable contact having the movable contact, An operating member connected to the movable contact for separating the contact, and a magnetic field generating means for generating a magnetic field in the vicinity of the contact, wherein the magnetic field generating means is opened when the operating member is actuated. A magnetic field is generated between the fixed contact and the movable contact in a direction parallel to the direction from the movable contact toward the operation member,The movable contact includes a pair of protrusions extending in the same direction as the opening operation with a side portion of the movable contact as a base point;It consists of a non-magnetic material for cooling the arc in two directions perpendicular to the direction of the magnetic field and perpendicular to the direction of separation, and starting from the fixed contact.All ofArc extinguishing gridFrom the tip of the protrusion to the fixed contact sideSince it is arranged, the arc extinguishing device can be obtained which can cut off the direct current in two directions and prevent the cut-off performance in the repeated cut-off of current. Further, the arc cooling effect is enhanced, and further, the arc cooling effect is enhanced without reducing the magnetic field strength acting on the arc.Furthermore, the effect of extending the arc is enhanced.
[0057]
A first contact formed of a first fixed contact and a first movable contact; a second contact formed of a second fixed contact and a second movable contact; and the first movable contact and the second movable contact at both longitudinal ends. An elongated movable contact; first magnetic field generating means for generating a magnetic field in the vicinity of the first contact; and second magnetic field generating means for generating a magnetic field in the vicinity of the second contact; Since the magnetic field directions of the first magnetic field generating means and the second magnetic field generating means are the same, there is no risk of dielectric breakdown between the arcs even when a large current is interrupted, and the interrupting performance is improved.
[0058]
Furthermore, since the magnetic force line induction member made of a magnetic material is disposed along the magnetic force lines generated from the first magnetic field generating means and the second magnetic field generating means and passing through the first contact and the second contact, The applied magnetic field strength is increased.
[0060]
  According to the present invention, in a vehicle-mounted switch that cuts off a current flowing for discharging or charging between a power source and a load by opening the contact, the first fixed contact and the first movable contact are included. A second contact composed of a contact, a second fixed contact and a second movable contact; an elongated movable contact having the first movable contact and the second movable contact at both longitudinal ends; and the movable contact connected to the movable contact; An operating member for separating the first contact and the second contact, a first magnetic field generating means for generating a magnetic field in the vicinity of the first contact, and a first for generating a magnetic field in the vicinity of the second contact The first magnetic field generating means is provided between the first movable contact and the first movable contact between the first fixed contact and the first movable contact, which are separated when the operating member is operated. Magnetic field in a direction parallel to the direction toward And the second magnetic field generating means is arranged in a direction from the second movable contact toward the operation member between the second fixed contact and the second movable contact which are separated when the operation member is operated. Generate a magnetic field in a parallel direction,The movable contact includes a pair of protrusions extending in the same direction as the opening operation from the side of the first movable contact as a base point, and the opening operation from the side of the second movable contact as a base point. A pair of protrusions extending in the same direction,It is made of a nonmagnetic material in two directions that are perpendicular to the direction of the magnetic field and perpendicular to the direction of the separation, with the first fixed contact as a starting point.All ofFirst arc extinguishing gridIt is arranged on the first fixed contact side from the tip of the protrusion on the first movable contact side., Made of non-magnetic material in two directions starting from the second fixed contactAll ofThe second arc extinguishing gridFrom the tip of the protrusion on the second movable contact side to the second fixed contact sideSince the arc extinguishing device is arranged and the first magnetic field generating means and the second magnetic field generating means have the same magnetic pole direction, the DC current in two directions can be interrupted, especially when a short circuit accident occurs. Current interruption performance is improved. Furthermore, the vehicle-mounted switch which prevented the fall of the interruption | blocking performance in the interruption of the electric current repeatedly is obtained. Also, the arc cooling effect is enhanced without reducing the magnetic field strength acting on the arc.Furthermore, the effect of extending the arc is enhanced.
[0061]
  In addition, a magnetic force line induction member made of a magnetic material is disposed along the magnetic force lines generated from the first magnetic field generating means and the second magnetic field generating means and passing through the first contact and the second contact.didBecause the arc extinguishing device is used, the magnetic field strength acting on the arc is increased.The
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view for explaining Embodiment 1;
FIG. 2 is a partially broken top view for explaining the first embodiment;
FIG. 3 is a partially broken front view for explaining the second embodiment.
FIG. 4 is a partially broken top view for explaining the second embodiment.
FIG. 5 is a partially broken front view for explaining the third embodiment.
FIG. 6 is a partially broken front view for explaining the fourth embodiment.
FIG. 7 is an enlarged perspective view of a main part for explaining a fourth embodiment.
FIG. 8 is a partially broken front view for explaining the fifth embodiment.
FIG. 9 is an electric circuit diagram schematically showing a main circuit of the electric vehicle.
FIG. 10 is a partially broken front view for explaining a conventional technique.
FIG. 11 is a partially broken front view for explaining blocking of a forward current in the prior art.
FIG. 12 is a partially broken front view for explaining blocking of reverse current in the prior art.
[Explanation of symbols]
1A to 1B fixed contact, 2A to 2B movable contact, 3A to 3B fixed contact, 4 movable contact, 4A to 4B arc horn, 5 insulating rod, 6 arc extinguishing chamber case, 6C hole in arc extinguishing chamber case, 7A to 7B Permanent magnet, 8A to 8B Arc extinguishing grid, 9A to 9C Magnetic field line guiding member, 10 Arc extinguishing device, 101 Power source, 102A to 102B On-vehicle switch, 103 On-vehicle charger, 104 Capacitor, 105 Inverter, 106 Motor, 111A 111B fixed contact, 112A-112B movable contact, 113A-113B fixed contact, 114 movable contact, 115 insulating rod, 116 arc extinguishing chamber case, 116C hole in arc extinguishing chamber case, 117A-117B permanent magnet

Claims (5)

In the arc extinguishing device for extinguishing the arc generated when the current is interrupted by breaking the contact,
A contact composed of a fixed contact and a movable contact; a movable contact having the movable contact; an operating member connected to the movable contact to open the contact; and a magnetic field generating means for generating a magnetic field in the vicinity of the contact. Prepared,
The magnetic field generating means generates a magnetic field in a direction parallel to a direction from the movable contact toward the operation member between the fixed contact and the movable contact that are opened by operating the operation member,
The movable contact includes a pair of protrusions extending in the same direction as the opening operation with a side portion of the movable contact as a base point;
All of the non-magnetic material for cooling the arc in two directions perpendicular to the direction of the magnetic field and perpendicular to the direction of the separation and starting from the fixed contact An arc extinguishing device, characterized in that an arc extinguishing grid is arranged on the fixed contact side from the tip of the projection . A first contact composed of a first fixed contact and a first movable contact, a second contact composed of a second fixed contact and a second movable contact, an elongated shape having the first movable contact and the second movable contact at both ends in the longitudinal direction A first magnetic field generating means for generating a magnetic field in the vicinity of the first contact, and a second magnetic field generating means for generating a magnetic field in the vicinity of the second contact,
2. The arc extinguishing apparatus according to claim 1, wherein the first magnetic field generating means and the second magnetic field generating means have the same magnetic pole direction.   A magnetic force line guiding member made of a magnetic material is disposed along the magnetic force lines generated from the first magnetic field generating means and the second magnetic field generating means and passing through the first contact and the second contact. The arc extinguishing apparatus according to claim 2. In a vehicle-mounted switch that cuts off the current that flows between the power source and the load for discharging or charging by opening the contacts.
A first contact composed of a first fixed contact and a first movable contact, a second contact composed of a second fixed contact and a second movable contact, an elongated shape having the first movable contact and the second movable contact at both ends in the longitudinal direction A movable contact, an operating member connected to the movable contact for separating the first contact and the second contact, a first magnetic field generating means for generating a magnetic field in the vicinity of the first contact, and a magnetic field Comprising a second magnetic field generating means for generating the first contact point in the vicinity of the second contact,
The first magnetic field generating means is parallel to a direction from the first movable contact toward the operation member between the first fixed contact and the first movable contact that are opened by the operation member. Generate a magnetic field in the direction,
The second magnetic field generating means is parallel to a direction from the second movable contact toward the operation member between the second fixed contact and the second movable contact that are opened by the operation member. Generate a magnetic field in the direction,
The movable contact includes a pair of protrusions extending in the same direction as the opening operation from the side of the first movable contact as a base point, and the opening operation from the side of the second movable contact as a base point. A pair of protrusions extending in the same direction,
All first arc-extinguishing grids made of a non-magnetic material in two directions perpendicular to the direction of the magnetic field and perpendicular to the direction of the separation and having the first fixed contact as a base point the place from the tip of the protrusion of the first movable contact side to the first fixed contact side, said all second arc extinguishing grid made of a nonmagnetic material in two directions that originates the second fixed contact No. Arranged on the second fixed contact side from the tip of the protrusion on the second movable contact side ,
A vehicle-mounted switch comprising an arc extinguishing device in which the first magnetic field generating means and the second magnetic field generating means have the same magnetic pole direction. An arc extinguishing device in which a magnetic force line induction member made of a magnetic material is disposed so as to follow a magnetic force line generated from the first magnetic field generating means and the second magnetic field generating means and passing through the first contact and the second contact. The on-vehicle switch according to claim 4 , wherein the switch is used.

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