JP6344281B2 - Conduction interruption device - Google Patents

Description

  The present invention relates to a conduction interrupting device that interrupts electrical conduction between devices constituting an electric circuit through cutting of a conductor.

  The electrical circuit is provided with a continuity interrupting device that shuts off electrical continuity between the devices by operating when the devices constituting the electrical circuit are abnormal or when the system in which the electrical circuit is mounted is abnormal. As one aspect thereof, for example, Patent Document 1 discloses a conduction interrupting device including a conductor, a gas generator, and a cutting member. The conductor is interposed between devices constituting the electric circuit. A gas generator is arrange | positioned in the location away from the conductor, and generates gas. The cutting member is disposed between the conductor and the gas generator, and is moved by the gas from the gas generator to cut the conductor. By this cutting, a pair of cut ends that are separated from each other are generated in the conductor, and the conductor is divided between the two cut ends, and conduction between the devices is cut off.

  By the way, when the conduction interrupting device is activated and the conductive material is cut, an electric potential difference is generated between the pair of cut ends generated by the cut, so that an arc is generated, that is, exists between both cut ends. There is a case where a phenomenon occurs in which current flows due to breakdown of gas insulation.

  The arc is more likely to occur as the distance between the cut ends is shorter. On the other hand, copper and aluminum generally used as a conductor are rich in ductility. For this reason, if the cutting member is moved at a high speed by gas to cut the conductor, the conductor expands much, and the distance between the cut ends is shortened accordingly, and the arc is likely to be generated. When the arc is generated, the two cut ends are electrically connected, and there is a possibility that the conductor is maintained in an energized state (conduction is not interrupted) even though the conductor is physically disconnected. In addition, the arc may melt the conductor and the surrounding resin member.

  On the other hand, in the conduction interrupting device described in Patent Document 1, the conductor is further cut by the cutting member and the arc generated between the pair of cut ends generated in the conductor by the cutting is attenuated. An arc chamber is provided. The arc extinguishing chamber is made of a material having electrical insulation. The arc-extinguishing chamber is provided with a concavo-convex portion in a region including at least a portion where one of both cutting ends approaches and a portion where the other approaches when the conductor is cut.

  Therefore, when the conductor in an energized state is cut by the cutting member, the arc moves from the one cut end toward the other cut end along the wall surface of the uneven portion. The length of the path along which the arc moves along the wall surface of the concavo-convex portion is longer than that when the concavo-convex portion is not provided, and the arc is attenuated. Therefore, the influence of the arc on the conduction breaker is smaller than that in which no measures are taken to attenuate the arc.

  In Patent Document 1, various structures are described in addition to the concave and convex portions as a structure for attenuating the arc. However, any structure is processed on at least one of the arc extinguishing chamber and the cutting member. It is formed by performing.

JP 2014-49300 A

  As described above, according to the conduction interrupting device described in Patent Document 1, even when an arc is generated between the cut ends due to the cutting of the energized conductor, the arc can be attenuated. However, in order to obtain the effect, processing for adding a structure for damping the arc to at least one of the arc extinguishing chamber and the cutting member is required.

  The present invention has been made in view of such circumstances, and the object thereof is a conduction interrupting device capable of attenuating an arc generated between cut ends due to cutting of a conductor with a simpler configuration. Is to provide.

A continuity interrupting device that solves the above-described problem is a conductor that is interposed between devices constituting an electric circuit and has a part to be cut, and an arc extinguishing chamber that is formed on one side in the thickness direction of the part to be cut And a gas generator disposed on the opposite side of the arc-extinguishing chamber across the cut portion and between the cut portion and the gas generator. A cutting member that is moved toward the arc-extinguishing chamber by the gas generated by the gas generator and cuts the cut portion in the arc-extinguishing chamber. A conduction interrupting device that generates a pair of cut ends that are separated from each other and interrupts electrical connection between the devices, and the arc attenuating material, the main component of which is made of a material having electrical insulation and shape followability, The arc-damping material used is the part to be cut by the cutting member Before cutting, there is at least one of the inner wall surface of the arc extinguishing chamber and the outer wall surface of the cutting member, where one of the two cutting ends approaches and the other approaches after the cutting of the cut portion. It is intended to cover at least a part of the area in between and in contact with the object, and the arc attenuating material is mixed with a filler having higher thermal conductivity than the substance constituting the main component. Yes.

  According to the above configuration, before the gas is generated from the gas generator, the cutting member is located between the cut portion of the conductor and the gas generator and is separated from the arc extinguishing chamber. Therefore, the part to be cut is not cut, and the devices constituting the electric circuit are brought into conduction through the conductor.

  At this time, it is at least one of the inner wall surface of the arc extinguishing chamber and the outer wall surface of the cutting member, and between the portion where one of both cutting ends approaches and the other approaches after the cutting portion is cut by the cutting member. An arc attenuating material that is a target for at least a part of the region and whose main component is made of a material having electrical insulation and shape following properties is disposed in contact with the target.

  On the other hand, when gas is generated from the gas generator while the conductor is energized, the cutting member is moved toward the arc extinguishing chamber by the gas. In the arc extinguishing chamber, the part to be cut is cut by the cutting member. Along with this cutting, a pair of cut ends in a state of being separated from each other are generated in the portion to be cut. A conductor will be in the state divided | segmented between both the cutting ends, and the continuity between apparatuses will be interrupted | blocked.

At this time, an arc may be generated due to a potential difference between the pair of cut ends, that is, a phenomenon may occur in which a current flows due to breakdown of gas insulation existing between both cut ends.
However, with the movement of the cutting member, the arc damping material is deformed along the shapes of both the arc extinguishing chamber and the cutting member. The arc attenuating material is located in at least a part of a region between the arc extinguishing chamber and the cutting member and sandwiched between both cutting ends by being deformed as described above. The arc attenuating material occupies at least a part of the gap between the arc extinguishing chamber and the cutting member, thereby reducing the gap and preventing the arc from flowing between the two cutting ends.

  Further, the arc attenuating material is decomposed and vaporized by the heat generated with the generation of the arc. This vaporization is performed by absorbing the heat of the arc. Therefore, this heat absorption reduces the temperature of the arc and attenuates the arc.

Since the arc is attenuated by the arc attenuating material, it is not necessary to process a structure for attenuating the arc in at least one of the arc extinguishing chamber and the cutting member.
As described above, the arc generated between the cutting ends due to the cutting of the conductor is attenuated while the arc damping material and the cutting member are not processed and the arc damping material is added.
Further, part of the heat generated with the generation of the arc is released (heat radiation) to the arc extinguishing chamber and the cutting member via the filler. Due to this heat dissipation, the temperature of the arc is lowered, and the arc is attenuated more efficiently than in the case where an arc attenuating material in which no filler is mixed is used.

  In the conduction interrupting device, at least a part of the inner wall surface of the arc extinguishing chamber is the target, and the arc damping material is attached to the target by application, and the cutting member cuts the cut portion. Before, it is preferable to maintain the state adhered to the object by its own adhesive force.

  According to the above configuration, the arc damping material attached to the target portion of the inner wall surface of the arc extinguishing chamber is attached by its own adhesive force before the cut portion is cut by the cutting member. Try to maintain the state. For this reason, the arc attenuating material is deformed along the shape of both the arc extinguishing chamber and the cutting member as the cutting member moves, so that the arc attenuating material is sandwiched between the arc extinguishing chamber and the cutting member and between the two cutting ends. Located in at least a part of the area.

  In the continuity interrupting device, at least a part of the outer wall surface of the cutting member is the target, and the arc attenuating material is attached to the target by coating, and before the cutting portion is cut by the cutting member It is preferable to maintain the state attached to the object by its own adhesive force.

  According to said structure, the arc damping material adhering to the said target place among the outer wall surfaces of a cutting member adheres by its own adhesive force before cutting | disconnection of the to-be-cut | disconnected part by a cutting member. Try to maintain the state. For this reason, the arc attenuating material is deformed along the shape of both the arc extinguishing chamber and the cutting member as the cutting member moves, so that the arc attenuating material is sandwiched between the arc extinguishing chamber and the cutting member and between the two cutting ends. Located in at least a part of the area.

  According to the said conduction | electrical_connection interruption | blocking apparatus, the arc which generate | occur | produced between the cutting ends with the cutting | disconnection of a conductor can be attenuated with a simpler structure.

Sectional drawing which shows the internal structure of the conduction | electrical_connection interruption | blocking apparatus in 1st Embodiment. The schematic diagram which shows schematic structure of the electric circuit to which the conduction | electrical_connection interruption apparatus of FIG. 1 is applied. The fragmentary sectional view which expands and shows the X section in FIG. The fragmentary sectional view which shows the state by which the to-be-cut | disconnected part of the conductor in FIG. 3 was cut | disconnected. It is a figure which shows the conduction | electrical_connection interruption | blocking apparatus in 2nd Embodiment, and is a fragmentary sectional view which shows the state before the to-be-cut | disconnected part of a conductor is cut | disconnected.

(First embodiment)
Hereinafter, a first embodiment embodying a conduction interrupting device will be described with reference to FIGS.

  FIG. 2 shows an electric circuit 11 to which the conduction interruption device C is applied. The electric circuit 11 includes a storage battery 12 and an electric device 13 as devices constituting the electric circuit 11. In the electric circuit 11, the electric device 13 is operated by supplying power from the storage battery 12. The electrical device 13 boosts the power input from the storage battery 12 and outputs the converter 14; the inverter 15 that converts the DC power input from the converter 14 into AC power suitable for driving the motor; The motor 16 is driven by AC power output from the inverter 15.

  The electric circuit 11 is mounted on the vehicle 10. When an impact due to a collision is applied to the vehicle 10, there is a risk that the electric device 13 may not operate properly or a leakage from the electric circuit 11 may be caused. Therefore, the vehicle 10 is provided with a continuity interrupting device C that interrupts continuity between devices constituting the electric circuit 11, for example, between the storage battery 12 and the electric device 13 in the event of the collision. The vehicle 10 is provided with a collision sensor 17 that detects the presence or absence of the collision and an electronic control unit 18 that is configured around a microcomputer and that receives a signal from the collision sensor 17. And if the electronic control unit 18 detects the collision of the vehicle 10 based on the output signal of the collision sensor 17, it will operate the conduction | electrical_connection interruption | blocking apparatus C. FIG. By this operation, the power supply from the storage battery 12 to the electrical device 13 is interrupted.

  As shown in FIG. 1, the conduction cutoff device C includes a conductor 20, a case 30, an explosive gas generator 45, and a cutting member 50. Next, each member which comprises the conduction | electrical_connection interruption | blocking apparatus C is demonstrated.

<Conductor 20>
The conductor 20 constitutes a conduction path for conducting between the storage battery 12 and the converter 14, and is also called a bus bar. The conductor 20 is formed in a long plate shape from a metal material having high electrical conductivity. As such a metal material, copper is representative, but other materials such as brass and aluminum may be used. Both end portions of the conductor 20 constitute external connection portions 20a and 20b. These external connection parts 20 a and 20 b are places connected to the storage battery 12 and the converter 14. That is, a through hole 21 is formed in each external connection portion 20a, 20b. Then, one of the external connection portions 20 a and 20 b is connected to a terminal conducting to the storage battery 12 and the other is connected to a terminal conducting to the converter 14 by a screw or the like using the through hole 21. The In this way, the conductor 20 is connected to the terminal of the electric circuit 11 at the external connection portions 20a and 20b, whereby the storage battery 12 and the converter 14 are electrically connected through the conductor 20.

  In addition to the external connection portions 20a and 20b, the conductor 20 has a cut portion 22 between them. The to-be-cut part 22 is extended in those parallel arrangement directions (left-right direction of FIG. 1) between both the external connection parts 20a and 20b. In addition, the extending direction of the part to be cut 22, that is, the juxtaposed direction of the external connection parts 20 a and 20 b may be referred to as the length direction of the part to be cut 22. Further, the thickness direction of the cut portion 22 refers to the thickness direction of the cut portion 22 before cutting.

<Case 30>
The case 30 is made of a material having electrical insulation and high strength, for example, a resin material, and an arrangement portion 31 for arranging the conductor 20 is formed therein. The conductor 20 is disposed in the arrangement portion 31 in a state where the external connection portions 20 a and 20 b are exposed to the outside of the case 30. In the case 30, an arc extinguishing chamber 32 is formed on one side of the cut portion 22 in the thickness direction (upward in FIG. 1). A movable chamber 41 is formed on the opposite side of the arc extinguishing chamber 32 (the lower side in FIG. 1) across the cut portion 22 in the thickness direction.

  The arc extinguishing chamber 32 cuts the cut portion 22 by the cutting member 50 and attenuates an arc generated between the pair of cut ends 23 and 24 (see FIG. 4) generated in the cut portion 22 by cutting. The room. The depth of the arc extinguishing chamber 32 (dimension in the direction perpendicular to the paper surface of FIG. 1) is set slightly larger than the width of the cut portion 22 (dimension in the direction perpendicular to the paper surface of FIG. 1). The cut portion 22 can enter the arc extinguishing chamber 32.

  As shown in FIG. 3, the arc extinguishing chamber 32 has a rectangular opening 33 that opens to face the cut portion 22 before cutting. In this opening 33, one side (left side in FIG. 3) in the length direction of the cut portion 22 constitutes a cut edge portion 34.

  The arc extinguishing chamber 32 has a plurality of inner wall surfaces. The plurality of inner wall surfaces include a first inner wall surface 35, a second inner wall surface 36, a third inner wall surface 37, and a pair of fourth inner wall surfaces 38 (only one is shown). The first inner wall surface 35 includes the cutting edge portion 34 and extends in a direction that intersects the cut portion 22 before cutting at a right angle or close to it. The second inner wall surface 36 is located at a location separated from the first inner wall surface 35 in the length direction of the cut portion 22. The second inner wall surface 36 is inclined with respect to the first inner wall surface 35 so that the distance from the first inner wall surface 35 becomes narrower as the distance from the opening 33 increases (the upper side in FIG. 3). The third inner wall surface 37 is located at a position farthest away from the opening 33 and is in a state of being parallel to or close to the part to be cut 22 before cutting. The pair of fourth inner wall surfaces 38 oppose each other in the width direction of the cut portion 22.

  As shown in FIG. 1, the movable chamber 41 has a substantially cylindrical shape extending along the thickness direction of the cut portion 22. Guide grooves 42 extending along the thickness direction are formed at a plurality of locations on the inner wall surface of the movable chamber 41.

<Gas generator 45>
The gas generator 45 is used as a drive source for the conduction cutoff device C. The gas generator 45 is disposed in the case 30 with a part thereof exposed to the movable chamber 41. The gas generator 45 is connected to the electronic control unit 18, and an operation signal is input from the electronic control unit 18 when the gas G (see FIG. 4) is generated. The gas generator 45 generates gas G by igniting and burning the built-in explosive in accordance with the input of the operation signal from the electronic control unit 18.

  In general, an apparatus driven using the explosive gas generator 45 can be driven more quickly than an apparatus using another system (such as an electromagnetic system) as a drive source. It is inexpensive and has high operational reliability.

<Cutting member 50>
The cutting member 50 protrudes from the main body 51 to the arc extinguishing chamber 32 side and extends in the thickness direction of the cut portion 22, and cooperates with the cutting edge portion 34 to be cut. And a blade portion 52 for cutting the portion 22. The cutting member 50 is disposed in the movable chamber 41 and between the cut portion 22 and the gas generator 45. Guide protrusions 53 extending along the thickness direction of the cut portion 22 are provided at a plurality of locations on the outer wall surface of the main body 51. The main body 51 is engaged with the guide groove 42 of the movable chamber 41 at the guide protrusion 53 so as to be movable in the thickness direction of the cut portion 22.

  As shown in FIG. 3, the blade part 52 has a plurality of outer wall surfaces. The plurality of outer wall surfaces include a first outer wall surface 55, a second outer wall surface 56, a third outer wall surface 57, and a pair of fourth outer wall surfaces 58 (only one is shown). The first outer wall surface 55 is only a small distance D, for example, around 0.5 mm, suitable for cutting (shearing) the cut portion 22 from the cutting edge portion 34 in cooperation with the cutting edge portion 34. At a distant place, it extends in a direction intersecting perpendicularly or close to the cut portion 22 before cutting. The second outer wall surface 56 is located at a location separated from the first outer wall surface 55 in the length direction of the cut portion 22. The second outer wall surface 56 is inclined corresponding to the second inner wall surface 36 of the arc extinguishing chamber 32, that is, the distance from the first outer wall surface 55 increases as the distance from the main body 51 (upward in FIG. 3). It inclines with respect to the said 1st outer wall surface 55 so that it may narrow. The third outer wall surface 57 is located at a position farthest from the main body 51 in the blade portion 52, and is parallel to or close to the portion to be cut 22 before cutting. The pair of fourth outer wall surfaces 58 oppose each other in the width direction of the cut portion 22.

In addition, the said cutting member 50 is formed using the material which has electrical insulation and high intensity | strength, for example, resin material like the said case 30 grade | etc.,.
<Arc damping material 60>
Furthermore, in 1st Embodiment, it targets for the location which satisfy | fills the following conditions among the inner wall surfaces of the arc-extinguishing chamber 32, and before this arc attenuation material 60 cut | disconnects the to-be-cut | disconnected part 22 by the cutting member 50, this object It is arrange | positioned in the state which contacted.

The condition is that “at least a part of a region between a location where one of the pair of cutting ends 23 and 24 approaches and a location where the other approaches after the cutting of the part 22 to be cut”.
In the first embodiment, the first inner wall surface 35, the third inner wall surface 37, and both the fourth inner wall surfaces 38 are the corresponding inner wall surfaces.

  As the arc attenuating material 60, a material whose main component is made of a material having electrical insulation and shape followability is used. Examples of applicable substances include the following soft substances.

  ・ Grease consisting mainly of mineral, plant-based, synthetic oil-based, fluorine-based base oil and thickener. Since grease has higher viscosity and lower fluidity than oil, it exhibits semi-solid or semi-fluidity at room temperature. An example of a plant base oil is castor oil. Examples of the synthetic oil-based base oil include olefin-based, silicone-based, and polyglycol-based oils. Examples of the fluorine base oil include perfluoroalkyl polyether oils. In this case, particles of PTFE (fluorocarbon resin) may be mixed with the base oil.

  ・ Gel consisting mainly of olefin, silicone, fluorine and acrylic materials. The gel is one in which colloidal particles of the polymer compound are aggregated and loses fluidity to solidify, or the polymer compound is crosslinked.

  The arc attenuating material 60 is applied to a portion of the inner wall surface of the arc extinguishing chamber 32 that satisfies the above conditions, in the first embodiment, to all of the region and the vicinity thereof, so that its own adhesive force is applied. It is attached to that part.

Next, the operation of the conduction cutoff device C according to the first embodiment configured as described above will be described.
When the collision of the vehicle 10 is not detected by the collision sensor 17, the operation signal is not output from the electronic control unit 18 to the gas generator 45, and the gas G is not generated from the gas generator 45. As shown in FIGS. 1 and 3, the cutting member 50 is located between the cut portion 22 of the conductor 20 and the gas generator 45 and is retracted from the arc extinguishing chamber 32. Therefore, the to-be-cut part 22 is not cut | disconnected, but it will be in the state electrically connected between the storage battery 12 and the converter 14 via the conductor 20. FIG.

  At this time, the arc damping material 60 made of grease or gel adheres to the inner wall surface (the first inner wall surface 35, the third inner wall surface 37, and both the fourth inner wall surfaces 38) of the arc extinguishing chamber 32 by its own adhesive force. Try to maintain the state.

  On the other hand, when the collision of the vehicle 10 is detected by the collision sensor 17 while the conductor 20 is energized, an operation signal is output from the electronic control unit 18 to the gas generator 45. As shown in FIG. 4, the gas generator 45 is activated in response to the activation signal to generate gas G. The cutting member 50 receives the pressure of the gas G toward the arc extinguishing chamber 32 side. At this time, the cutting member 50 is guided to the arc extinguishing chamber 32 side by the guide protrusion 53 moving in the guide groove 42 of the movable chamber 41.

The cutting member 50 moves at high speed toward the arc extinguishing chamber 32. Along with this movement, the blade portion 52 hits the cut portion 22 and the cut portion 22 is pressed toward the arc extinguishing chamber 32.
Here, it is assumed that the second inner wall surface 36 extends in a direction orthogonal to the cut portion 22 before cutting, and two sides facing the length direction of the cut portion 22 are both cut edge portions 34. When the second outer wall surface 56 of the blade portion 52 is orthogonal to the portion to be cut 22 before cutting and the blade portion 52 moves near the cutting edge portions 34, the portion to be cut 22 is cut at two places. The However, in this case, it is necessary to move the cutting member 50 to the arc extinguishing chamber 32 side with a double load as compared with the case where the blade portion 52 cuts the cut portion 22 at one place, and a large load is generated. Necessary.

  In this regard, in the first embodiment, the second inner wall surface 36 is inclined with respect to the first inner wall surface 35 so that the distance from the first inner wall surface 35 becomes narrower as the distance from the opening 33 increases. Further, the second outer wall surface 56 is inclined with respect to the first outer wall surface 55 so that the distance from the first outer wall surface 55 becomes narrower as the distance from the main body 51 increases.

  Therefore, in the portion 22 to be cut that has been pressed toward the arc extinguishing chamber 32 by the cutting member 50 as described above, stress concentrates on the vicinity of the cutting edge portion 34. The part to be cut 22 is cut between the cutting edge part 34 and the first outer wall surface 55 of the blade part 52. By this cutting, a pair of cutting ends 23 and 24 separated from each other are generated in the cut portion 22. As the cutting member 50 continues to move after cutting, the blade 52 enters the inner part of the arc extinguishing chamber 32.

  One cutting end 23 is not pressed by the cutting member 50 and is therefore located near the cutting edge portion 34. On the other hand, a portion including the other cutting end 24 in the cut portion 22 is pressed by the cutting member 50 and enters the arc extinguishing chamber 32. The portion of the cut portion 22 is bent at an obtuse angle along the inclined second outer wall surface 56 of the blade portion 52 and the inclined second inner wall surface 36 of the arc extinguishing chamber 32 by pressing of the cutting member 50. The load required for such bending is smaller than the load required for cutting. Therefore, the load required to move the cutting member 50 toward the arc extinguishing chamber 32 can be small.

  The other cut end 24 is located near the third outer wall surface 57 of the blade portion 52. In other words, the cutting end 24 is positioned in a gap between the third inner wall surface 37 of the arc extinguishing chamber 32 and the third outer wall surface 57 of the blade portion 52 that has entered the arc extinguishing chamber 32.

Here, the conductor 20 made of copper is rich in ductility. When the cut portion 22 extends during cutting, the distance between the cut ends 23 and 24 becomes short, and an arc is likely to occur.
In this regard, in the first embodiment, the conductor 20 is cut by the cutting edge portion 34 and the blade portion 52 (the first outer wall surface 55) that moves at a position separated by a slight distance D. Therefore, the amount of elongation of the cut portion 22 is small as compared to the case where the cut portion 22 is not cut and the cut portion 22 is cut only by pressing the cutting member 50. Accordingly, the distance between the cut ends 23 and 24 is increased.

  The to-be-cut part 22 will be in the state divided | segmented between both the cut ends 23 and 24, and the continuity between the storage battery 12 and the converter 14 will be interrupted | blocked. At this time, an arc is generated by generating a potential difference between the two cut ends 23 and 24 generated by the cutting, that is, the gas insulation existing between the two cut ends 23 and 24 may be broken and a current may flow. . At this time, the arc is directed from the cut end 23 toward the cut end 24, or vice versa, from the cut end 24 toward the cut end 23, and the inner wall surface (first surface) of the arc extinguishing chamber 32 formed of an electrically insulating material. It tries to move along the inner wall surface 35, the third inner wall surface 37, and both the fourth inner wall surfaces 38).

  However, in the first embodiment, the arc attenuating material 60 is deformed along the shapes of both the arc extinguishing chamber 32 and the blade portion 52 as the cutting member 50 moves, so that the arc extinguishing chamber 32 and the blade portion are deformed. 52 and at least a part of the region sandwiched between the two cut ends 23 and 24. This is because the arc damping material 60 is attached to the inner wall surface (first inner wall surface 35, third inner wall surface 37, and both fourth inner wall surfaces 38) of the arc extinguishing chamber 32 by its own adhesive force. It can consist of maintaining and having a shape followability which consists of a soft substance.

  The arc attenuating material 60 makes the gap between the arc extinguishing chamber 32 and the blade 52 smaller than when the arc attenuating material 60 is not provided, so that the arc flows between the cut ends 23 and 24. Acts to prevent.

  Further, when the arc is generated with heat of 5000 K or more, the arc damping material 60 is exposed to this heat and decomposes and vaporizes in a short time. This vaporization is performed by absorbing the heat of the arc. Therefore, this heat absorption reduces the temperature of the arc and attenuates the arc.

  As a result, the influence of the arc on the conduction breaker C is reduced. For example, it becomes difficult to generate a state in which the cut ends 23 and 24 are electrically connected by an arc. In spite of the fact that the conductor 20 is physically cut, a phenomenon in which it is maintained in an energized state (conduction is not interrupted) is less likely to occur. Further, the phenomenon that the conductor 20 and the surrounding resin member are softened or melted due to exposure to a high-temperature arc is suppressed.

According to the first embodiment described in detail above, the following effects can be obtained.
(1) An arc attenuating material 60 composed of a substance whose main component has electrical insulation and shape following properties is used. Of the inner wall surface of the arc extinguishing chamber 32, at least a part of a region between a location where one of the cutting ends 23 and 24 approaches and a location where the other approaches after the cutting member 22 is cut by the cutting member 50 Before the cutting part 22 is cut by the cutting member 50, the arc attenuating material 60 is disposed in contact with the object (FIGS. 3 and 4).

  Therefore, the arc attenuating material 60 can reduce the gap between the arc extinguishing chamber 32 and the blade portion 52 of the cutting member 50, and can attenuate the flow of the arc between the two cutting ends 23 and 24. Further, the arc damping material 60 can be decomposed and vaporized by the heat generated by the generation of the arc, and the arc heat can be absorbed and the arc can be attenuated.

As a result, unlike the conventional conduction interruption device, it is not necessary to process a structure for attenuating the arc in either the arc extinguishing chamber 32 or the cutting member 50.
As described above, the arc generated between the cut ends 23 and 24 due to the cutting of the conductor 20 is simple, such as adding the arc attenuating material 60 without processing the arc extinguishing chamber 32 and the cutting member 50. Can be attenuated.

  (2) At least a part of the inner wall surface of the arc extinguishing chamber 32 is the target, and the arc damping material 60 is applied and adhered thereto. And before cutting the to-be-cut | disconnected part 22 by the cutting member 50, the arc attenuation | damping material 60 is made to maintain the state adhering to the said object with own adhesive force (FIG. 3).

  Therefore, the arc attenuating material 60 is deformed along the shapes of both the arc extinguishing chamber 32 and the cutting member 50 as the cutting member 50 moves, so that the arc attenuating material 60 is between the arc extinguishing chamber 32 and the cutting member 50. , And can be positioned in at least a part of the region sandwiched between the cut ends 23 and 24.

(3) The arc damping material 60 is made of grease or gel (FIG. 3).
Therefore, the arc damping material 60 can continue to adhere to the inner wall surface of the arc extinguishing chamber 32 by its own adhesive force before the cut portion 50 is cut by the cutting member 50. Therefore, it is not necessary to separately provide means for keeping the arc damping material 60 attached to the inner wall surface of the arc extinguishing chamber 32.

Further, as the cutting member 50 moves, it is easy to deform the arc attenuating material 60 along the shapes of both the arc extinguishing chamber 32 and the blade portion 52 of the cutting member 50.
(Second Embodiment)
Next, 2nd Embodiment which actualized the conduction | electrical_connection interruption | blocking apparatus is described with reference to FIG.

  In the second embodiment, the object to which the arc attenuating material 60 composed mainly of grease or gel is applied is the outer wall surface of the blade 52 in the cutting member 50, and is the inner wall surface of the arc extinguishing chamber 32. Different from one embodiment. More specifically, the arc attenuating material 60 includes a portion where one of the cutting ends 23 and 24 approaches and a portion where the other approaches after the cutting of the cut portion 22 by the cutting member 50 on the outer wall surface of the cutting member 50. It is attached by being applied to at least a part of the area between. In the second embodiment, the first outer wall surface 55, the third outer wall surface 57, and both the fourth outer wall surfaces 58 (see FIG. 3) are the corresponding outer wall surfaces.

Other configurations are the same as those in the first embodiment. For this reason, the same elements as those described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
In the second embodiment configured as described above, the arc attenuating material 60 made of grease or gel has an outer wall surface (on the outer wall surface of the blade portion 52 (by its own adhesive force) before the cutting member 22 is cut by the cutting member 50. The first outer wall surface 55, the third outer wall surface 57, and both the fourth outer wall surfaces 58) are intended to be maintained. Therefore, the arc attenuating material 60 is deformed along the shape of both the arc extinguishing chamber 32 and the blade portion 52 as the cutting member 50 moves, so that the arc attenuating material 60 is between the arc extinguishing chamber 32 and the cutting member 50. , Located in at least a part of the region sandwiched between the cut ends 23 and 24.

Therefore, according to the second embodiment, the same effects as the above (1) to (3) can be obtained although the object to which the arc damping material 60 is applied is different from that of the first embodiment.
In addition, said each embodiment can also be implemented as a modification which changed this as follows.

<About the arc extinguishing chamber 32>
The opening 33 of the arc extinguishing chamber 32 may have a polygonal shape other than a square (rectangle). Further, two or more sides of the opening 33 may be cut edge portions.

<About the arc damping material 60>
As the arc attenuating material 60, the main component described in the first and second embodiments described above and a material added with another substance may be used. For example, a material in which a filler having higher thermal conductivity (rate) than the material constituting the main component is mixed may be used as the arc damping material 60.

  As the filler, for example, those composed of oxide compounds such as silicon dioxide and aluminum oxide, and those composed of nitride compounds such as boron nitride and aluminum nitride are suitable, but besides these, talc, What consists of minerals, such as mica, may be used.

  If it does in this way, a part of heat which generate | occur | produces between both the cut ends 23 and 24 with generation | occurrence | production of an arc will be discharge | released to the arc extinguishing chamber 32 and the cutting member 50 via a filler (heat dissipation). The degree of heat dissipation at this time is larger as the thermal conductivity of the filler is higher. And by the said heat radiation, the temperature of an arc falls and an arc is attenuate | damped more efficiently than the case where the arc damping material 60 in which the filler is not mixed is used.

  The filler is harder than the material constituting the main component of the arc damping material 60 and has higher heat resistance than the material. Therefore, the time during which the arc-attenuating material 60 mixed with the filler is decomposed and vaporized by the arc is longer than when the filler is not mixed. Therefore, the effect of sustaining the effect of attenuating the arc can also be expected.

  -Both the inner wall surface of the arc extinguishing chamber 32 and the outer wall surface of the cutting member 50, where one of the cutting ends 23, 24 approaches and the other approaches after the cutting member 50 cuts the cut portion 22. At least a part of the region between them may be a target for the arrangement of the arc attenuating material 60. Then, before the cutting member 50 is cut by the cutting member 50, the arc damping material 60 may be disposed by application on the target portions of the inner wall surface of the arc extinguishing chamber 32 and the outer wall surface of the cutting member 50. .

  In the first embodiment, the arc attenuating material 60 may be applied to the second inner wall surface 36 in addition to the first inner wall surface 35, the third inner wall surface 37, and both the fourth inner wall surfaces 38. That is, all the inner wall surfaces of the arc extinguishing chamber 32 are targeted, and the arc damping material 60 may be applied thereto. The arc extinguishing chamber 32 may be filled with the arc damping material 60.

In the second embodiment, the arc attenuating material 60 may be applied to the second outer wall surface 56 in addition to the first outer wall surface 55, the third outer wall surface 57 and both the fourth outer wall surfaces 58.
The arc attenuating material 60 is at least one of the inner wall surface of the arc extinguishing chamber 32 and the outer wall surface of the cutting member 50 before cutting the cut portion 22 by the cutting member 50, and after the cut portion 22 is cut Only a part of a region between a location where one of the cutting ends 23 and 24 approaches and a location where the other approaches may be targeted, and the cutting ends 23 and 24 may be disposed in contact with the target.

<Others>
In each of the above embodiments, a resin material can be used as a material for forming the case 30 and the cutting member 50, but in addition, the material is strong enough to cut the cut portion 22, and Any material can be adopted on condition that the material has appropriate electrical insulation.

  In each of the above embodiments, as a method of forming the case 30 and the cutting member 50, any method such as a method of forming using mold molding or a method of forming by cutting can be employed.

  The continuity cutoff device C is not limited to the one provided between the storage battery 12 and the converter 14, but is applied as long as it is a device that is provided between devices constituting an electric circuit and cuts off continuity between the devices. be able to. As such a device, for example, in a fuel cell vehicle, a continuity cutoff device provided between a fuel cell and a vehicle driving motor, a continuity cutoff device provided between a power source of a stationary system and an electric device, a stationary type Examples thereof include a continuity cutoff device provided between the electrical devices of the system.

In addition, the technical ideas that can be grasped from the respective embodiments will be described together with their effects.
(A) In the conduction breaker according to any one of claims 1 to 4, a main component of the arc attenuating material is composed of grease or gel.

  According to the above configuration, the arc damping material mainly composed of grease or gel adheres to the arc extinguishing chamber and the cutting member due to its own adhesive force before the cut portion is cut by the cutting member. It tries to maintain its attached state against what has been done. Further, the arc damping material is easily deformed along the shapes of both the arc extinguishing chamber and the cutting member as the cutting member moves.

  DESCRIPTION OF SYMBOLS 11 ... Electric circuit, 12 ... Storage battery (equipment which comprises an electric circuit), 13 ... Electric equipment (equipment which comprises an electric circuit), 20 ... Conductor, 22 ... Cut part, 23, 24 ... Cut end, 32 ... Arc extinguishing chamber, 35 ... first inner wall surface, 36 ... second inner wall surface, 37 ... third inner wall surface, 38 ... fourth inner wall surface, 45 ... gas generator, 50 ... cutting member, 55 ... first outer wall surface, 56 ... 2nd outer wall surface, 57 ... 3rd outer wall surface, 58 ... 4th outer wall surface, 60 ... Arc damping material, C ... Conduction interruption device, G ... Gas.

Claims (3)

A conductor interposed between devices constituting an electric circuit and having a part to be cut;
An arc extinguishing chamber formed on one side in the thickness direction of the cut portion;
A gas generator disposed on the opposite side of the arc-extinguishing chamber in the thickness direction with the cut portion interposed therebetween;
It is arrange | positioned between the said to-be-cut part and the said gas generator, is moved toward the said arc-extinguishing chamber with the gas generated with the gas generator, and cuts the to-be-cut part in the same arc-extinguishing chamber A cutting member, and a cut-off device that causes a pair of cut ends in a state of being separated from each other by cutting, and cuts off conduction between the devices,
An arc damping material made of a material whose main component has electrical insulation and shape following properties is used,
The arc attenuating material is at least one of an inner wall surface of the arc extinguishing chamber and an outer wall surface of the cutting member before the cutting portion is cut by the cutting member, and both cuttings are performed after the cutting portion is cut. Targeting at least a part of the area between the location where one of the ends approaches and the location where the other approaches, and in contact with the same ,
A conduction interruption device in which the arc attenuating material is mixed with a filler having higher thermal conductivity than the material constituting the main component . At least a part of the inner wall surface of the arc extinguishing chamber is the target,
The arc attenuating material is attached to the object by coating, and maintains the state of being attached to the object by its own adhesive force before the cutting part is cut by the cutting member. Item 2. The conduction interrupting device according to Item 1. At least a part of the outer wall surface of the cutting member is the target,
The arc attenuating material is attached to the object by coating, and maintains the state of being attached to the object by its own adhesive force before the cutting part is cut by the cutting member. Item 3. The conduction interruption device according to Item 1 or 2.