WO2023171087A1

WO2023171087A1 - Electric circuit breaker

Info

Publication number: WO2023171087A1
Application number: PCT/JP2022/047501
Authority: WO
Inventors: 直希山村; 明彦清水
Original assignee: 太平洋精工株式会社
Priority date: 2022-03-08
Filing date: 2022-12-23
Publication date: 2023-09-14
Also published as: JP2023130604A

Abstract

The present invention provides an electric circuit breaker that minimizes any increase in the motive power of a motive power source and that can easily break an electric circuit, even when the resistance of a part to be broken is reduced.　An electric circuit breaker 600 comprising a housing 300, a part 400 to be broken that is disposed inside the housing 300 and constitutes part of an electric circuit, a motive power source P disposed on a first-end-part 320 side of the housing 300, and a moving body 500 that moves within the housing 300 between the first end part 320 and a second end part 330 on the side opposite from the first end part 320, the electric circuit breaker 600 being characterized in that: the part 400 to be broken is provided with two physically separate base pieces 430; pressing force F is applied in mutually opposing directions between end surfaces 431 of the base pieces 430 to electrically connect the base pieces 430 to each other; and while the moving body 500 is caused to move from the first end part 320 toward the second end part 330 by the motive power source P, part of the moving body 500 breaks the connection between the base pieces 430.

Description

electrical circuit interrupter

TECHNICAL FIELD The present invention relates to an electrical circuit interrupting device that can be mainly used in electrical circuits of automobiles and the like.

Conventionally, electric circuit breaker devices have been used to protect electric circuits installed in automobiles, etc., and various electrical components connected to the electric circuits. Specifically, when an abnormality occurs in the electrical circuit, the electrical circuit interrupting device physically interrupts the electrical circuit by cutting off a part of the electrical circuit.

There are various types of this electric circuit breaking device. For example, the electric circuit breaking device of Patent Document 1 includes a housing, a part to be cut off which is arranged in the housing and constitutes a part of the electric circuit, and the electrical circuit breaking device of Patent Document 1. a power source disposed on a first end side of the housing; and a movable body that moves within the housing between the first end and a second end opposite to the first end. An electric circuit interrupting device comprising: a movable body moving from the first end toward the second end by the power source, and a part of the movable body touching the to-be-interrupted part; disconnect and interrupt the electrical circuit.

By the way, as the performance of automobiles and other vehicles has improved in recent years, the voltage and current applied to electric circuits have tended to increase, so the heat generated by the current flowing through the disconnected part that forms part of the electric circuit, that is, the power loss, has also increased. There is. Therefore, power loss has been suppressed by increasing the thickness of the cut-off section to increase the cutting cross-sectional area and lowering the resistance of the cut-off section. However, if the cutting cross-sectional area is increased, the power required to cut the part to be cut must be increased, and as a result, the strength of the housing must be increased to withstand the increased power (such as the explosive force of gunpowder). We need to improve further. Additionally, along with this, there is a problem in that the housing becomes larger and the electric circuit interrupting device becomes larger and more expensive.

Patent application 2021-100645

Therefore, in view of the above-mentioned problems, the present invention provides an electric circuit interrupting device that can easily interrupt an electric circuit by suppressing an increase in the power of the power source even when the resistance of the section to be interrupted is lowered. do.

The electrical circuit interrupting device of the present invention includes a housing, a section to be interrupted that is disposed within the housing and constitutes a part of an electric circuit, a power source disposed on a first end side of the housing, and a power source disposed on a first end side of the housing. An electric circuit breaking device comprising: a movable body that moves between the first end and a second end opposite to the first end; The base piece is provided with two physically separate base pieces, and the base pieces are electrically connected to each other by applying a pressing force in directions facing each other between the end faces of the base pieces, The movable body is configured such that while the movable body is moved from the first end toward the second end by the power source, a part of the movable body interrupts the connection between the base pieces. It is characterized by the presence of

According to the above feature, the electrically connected state is maintained by abutting the separate base pieces against each other by pressing force in opposing directions. Furthermore, when interrupting an electrical circuit, instead of physically cutting the integrally formed part to be interrupted with great force, as in the past, the connection state between the end faces of the base pieces, which were originally separate pieces, is separated. do it. Therefore, even when reducing the resistance of the part to be interrupted, the electric circuit can be easily interrupted with less power than before, and it is possible to suppress the increase in size and manufacturing cost of the electric circuit interrupting device. In addition, since a pressing force is applied to the end face of the base piece, the contact resistance between the end face of the base piece and the opposing end face can be kept low, and furthermore, this state can be maintained for a long period of time. .

The electric circuit interrupting device of the present invention is characterized in that a separation piece is provided between the base pieces, and the separation piece is pressed and sandwiched between the base pieces on both sides by the pressing force.

According to the above feature, the contact resistance between the end face of the base piece and the opposing end face of the separation piece can be suppressed to a low level, and furthermore, this state can be maintained for a long period of time.

In the electric circuit interrupting device of the present invention, in the section to be interrupted, the thickness of the portion where the end surface of the separation piece and the end surface of the base piece contact is the same as that of the external connection terminal connecting the base piece and the electric circuit. It is characterized by being larger than its thickness.

According to the above feature, by making the thickness of the contact point between the end face of the base piece and the end face of the separation piece locally larger than other parts, the contact area between the end face of the base piece and the end face of the separation piece is increased. It can be made wider, and as a result, the resistance at the contact point can be lowered and power loss can be suppressed.

The electric circuit interrupting device of the present invention is characterized in that the end face of the base piece or the end face of the separation piece is plated with a metal whose hardness is lower than that of the metal constituting the to-be-interrupted portion.

According to the above feature, when a pressing force is applied, the plating layer with low hardness is strongly pressed and crushed by the end face of the base piece and the end face of the separation piece, which have high hardness. It is possible to more reliably fill gaps caused by minute irregularities on the surface of the end face of the piece, and to suppress contact resistance to a low level.

The electric circuit interrupting device of the present invention is characterized in that the end face of the base piece or the end face of the separation piece is provided with a recessed face or a protruding face that can be fitted.

The assembled base piece and separation piece can be fitted and fixed so that they do not shift.

As described above, according to the electric circuit interrupting device of the present invention, even when the resistance of the section to be interrupted is lowered, the power of the power source can be suppressed from increasing and the electric circuit can be easily interrupted.

(a) is an overall perspective view of a lower housing that constitutes a housing of an electric circuit breaker according to Embodiment 1 of the present invention, and (b) is a plan view of the lower housing. (a) is an overall perspective view of an upper housing that constitutes a housing of an electric circuit breaker according to Embodiment 1 of the present invention, and (b) is a bottom view of the upper housing. (a) is a perspective view of a movable body of an electric circuit breaker according to Embodiment 1 of the present invention, and (b) is a bottom view of the movable body. (a) is an exploded perspective view of a section to be interrupted of an electric circuit interrupting device according to Embodiment 1 of the present invention, and (b) is a plan view of the section to be interrupted. 1 is an exploded perspective view of an electric circuit interrupting device according to Embodiment 1 of the present invention; FIG. FIG. 6 is a sectional view taken along the line AA in the assembled state of the electric circuit breaker shown in FIG. 5; FIG. 7 is a cross-sectional view showing how the moving body has moved from the state shown in FIG. 6; FIG. 7 is a perspective view of a portion to be interrupted and a lower housing of the electric circuit interrupting device of the present invention according to Embodiment 2; (a) is a side view of the cut-off part and the lower housing of the electric circuit interrupting device of the present invention according to Embodiment 2, and (b) is a side view of the cut-off part fixed to the lower housing. . FIG. 7 is a perspective view of a portion to be interrupted and a lower housing of an electric circuit interrupting device of the present invention according to Embodiment 3; FIG. 7 is a plan view of a state in which a portion to be interrupted of an electric circuit interrupting device of the present invention according to Embodiment 3 is fixed to a lower housing. (a) is a perspective view of the to-be-interrupted part of the electric circuit interrupting device according to Embodiment 4, and (b) is a plan view of the to-be-interrupted part. FIG. 7 is an exploded perspective view showing a portion to be interrupted, a lower housing, and a movable body of an electric circuit interrupting device according to a fourth embodiment. 7 is a sectional view showing an electric circuit interrupting device according to a fourth embodiment, similar to that shown in FIG. 6. FIG. 15 is a cross-sectional view of a state in which the moving body has moved from the state shown in FIG. 14. FIG. (a) is a perspective view of the to-be-interrupted part of the electric circuit breaker according to Embodiment 5, and (b) is a side view of the to-be-interrupted part.

300 Housing 320 First end 330 Second end 400 Part to be interrupted 430 Base piece 500 Moving body 600 Electric circuit breaker F Pressing force P Power source

Each embodiment of the present invention will be described below with reference to the drawings. In addition, the shape, material, etc. of each member of the electric circuit breaker in the embodiment described below show an example, and are not limited to these.

<Embodiment 1>
First, FIG. 1 shows a lower housing 100 that constitutes a housing 300 of an electric circuit breaker according to Embodiment 1 of the present invention. Note that FIG. 1(a) is an overall perspective view of the lower housing 100, and FIG. 1(b) is a plan view of the lower housing 100.

As shown in FIG. 1, the lower housing 100 is a substantially rectangular prism made of an insulator such as synthetic resin, and includes a hollow lower accommodating portion 110 therein. The lower accommodating portion 110 extends from the upper surface 120 of the lower housing 100 toward the lower surface 130, and is configured to accommodate a moving body 500, which will be described later. Moreover, the inner surface 111 of the lower housing part 110 is a smooth surface so that the movable body 500 can slide vertically inside.

Furthermore, a part of the upper surface 120 is provided with a mounting part 113 that is recessed in accordance with the shape of the base piece 430 so that a base piece 430 of a portion to be blocked 400, which will be described later, can be placed thereon. This placing part 113 is arranged so as to face both sides of the lower housing part 110, and the placing part 113 supports the linearly extending part 400 to be blocked on both sides. Further, the placing part 113 is provided with an engaging inner surface 115 on the inside and an engaging outer surface 116 on the outside so that a claw-shaped fixing part of a base piece 430, which will be described later, can be engaged with the placing part 113. The distance between the opposing mounting parts 113, more specifically, the distance between the engaging inner surfaces 115 is L1.

Next, FIG. 2 shows an upper housing 200 that constitutes a housing 300 of an electric circuit breaker according to Embodiment 1 of the present invention. 2(a) is an overall perspective view of the upper housing 200, and FIG. 2(b) is a bottom view of the upper housing 200.

As shown in FIG. 2, the upper housing 200 is a substantially rectangular prism made of an insulator such as synthetic resin, and forms a pair with the lower housing 100 shown in FIG. 1 to form a housing 300. . A hollow upper housing part 210 is provided inside, and this upper housing part 210 extends from the lower surface 230 of the upper housing 200 toward the upper surface 220, and is configured to accommodate a moving body 500, which will be described later. There is. Moreover, the inner surface 211 of the upper housing part 210 is a smooth surface so that the movable body 500 can slide vertically inside. As will be described later, this upper housing part 210 is arranged above and below the lower housing part 110 of the lower housing 100 to constitute a housing part 310 that extends linearly. You can move up and down inside.

Furthermore, an insertion part 213 is formed in a part of the lower surface 230 and is recessed to match the shape of the base piece 430 so that a base piece 430 of a to-be-blocked part 400, which will be described later, can be inserted therethrough. The insertion portions 213 are arranged to face both sides of the upper housing portion 210 and are also arranged at positions corresponding to the placement portions 113 of the lower housing 100. Therefore, the insertion portion 213 is fitted from above into the base piece 430 of the blocked portion 400 placed on the placement portion 113 of the lower housing 100.

Furthermore, a power source storage section 221 in which the power source P is housed is formed in a part of the upper surface 220 side of the upper housing 200. The power source storage section 221 communicates with the upper end side of the upper storage section 210. As will be described in detail later, power such as air pressure generated from the power source P housed in the power source storage section 221 is transmitted to the movable body 500 within the upper housing section 210 to move the movable body 500. Note that the lower housing 100 and the upper housing 200 are approximately square prisms made of synthetic resin, but are not limited to this, as long as they have high insulation properties and are strong enough to withstand use. It may be made of other materials and of any shape.

Next, FIG. 3 shows a moving body 500 according to Embodiment 1 of the present invention. Note that FIG. 3(a) is a perspective view of the moving body 500, and FIG. 3(b) is a bottom view of the moving body 500.

As shown in FIG. 3, the movable body 500 is made of an insulator such as synthetic resin, and has a substantially cylindrical main body 510 on the upper end side, a flat rectangular sliding part 520 in the center, and a lower end side. and a protrusion 530 that protrudes downward. A recess 511 is provided at the upper end of the main body 510, and the recess 511 is a portion facing the power source P. The sliding portion 520 has a shape corresponding to the inner surface shape of the accommodating portion 310, and as the sliding portion 520 slides on the inner surface of the accommodating portion 310, the movable body 500 maintains its posture along the inside of the accommodating portion 310. You can slide smoothly while maintaining the Further, the surface shape of the lower end 531 of the protruding portion 530 is the same as the surface of the separation piece 420 of the to-be-blocked portion 400, which will be described later. Therefore, the power of the movable body 500 can be efficiently transmitted to the separation piece 420, and the separation piece 420 can be easily separated.

Although the movable body 500 is made of synthetic resin, it is not limited to this, and may be made of any other material and have any shape as long as it has high insulation properties and strength enough to withstand use. Further, the surface shape of the lower end 531 of the protruding portion 530 is the same as the surface shape of the separating piece 420 of the blocked portion 400, but is not limited to this. It may have any shape as long as it can be cut by applying a pressing force to the separating piece 420 of the section 400.

Next, FIG. 4 shows a section to be interrupted 400 that constitutes a part of the electric circuit to be interrupted by the electric circuit interrupter 600 according to Embodiment 1 of the present invention. Note that FIG. 4(a) is an exploded perspective view of the blocked portion 400, and FIG. 4(b) is a plan view of the blocked portion 400.

The part to be cut off 400 is entirely made of a conductor made of metal such as copper in order to be electrically connected to an electric circuit, and has a base piece 430 at both ends for connection to the electric circuit, and a portion between the base piece 430. and a separation piece 420 located at. A connection hole 410 is formed at the end of the base piece 430 to be used when connecting to an electric circuit. Furthermore, the base piece 430 includes a fixing part 440 for fixing to the mounting part 113 of the lower housing 100. This fixing portion 440 is formed in a substantially U-shape and includes opposing fixing claws 411 . Further, the end surface 431 of the base piece 430 is a flat surface that spreads in the thickness direction of the blocked portion 400. Further, the base piece 430 includes a projecting surface 432 projecting from the end surface 431.

On the other hand, on both sides of the separation piece 420, flat end surfaces 421 are provided that extend in the thickness direction of the blocked portion 400. Further, the separation piece 420 includes a recessed surface 422 recessed from an end surface 421. As shown in FIG. 4(a), the separation piece 420 and the base pieces 430 on both sides are separate bodies, but as shown in FIG. 4(b), the end surface 431 of the base piece 430 and the separation piece 420 The end face 421 can be brought into close contact with the end face 421 and assembled so as to be electrically and physically connected to each other. At this time, since the protruding surface 432 of the base piece 430 is fitted into the recessed surface 422 of the separation piece 420, the assembled separation piece 420 and base piece 430 are prevented from shifting from each other. Note that when the separation piece 420 and the base piece 430 are assembled, the distance between the fixing parts 440 of the base pieces 430 on both sides is L2. Moreover, the separation piece 420 is not limited to the shape shown in FIG. 4, but may have any shape as long as the base pieces 430 on both sides can be electrically and physically connected. Further, although the protruding surface 432 of the base piece 430 is fitted into the recessed surface 422 of the separation piece 420, the present invention is not limited to this. It may be fitted to Further, the shapes of the recessed surface 422 and the protruding surface 432 are not limited to the shape shown in FIG. 4, but may be any shape as long as they can be fitted together. Furthermore, although the blocked section 400 shown in FIG. 4 includes one separation piece 420, the present invention is not limited thereto, and the blocked section 400 may include two or more separation pieces that are separated from each other.

Next, how to assemble the electric circuit interrupting device 600 of the present invention will be explained with reference to FIGS. 5 and 6. 5 is an exploded perspective view of the electric circuit breaking device 600, and FIG. 6 is a sectional view taken along line AA in the assembled state of the electric circuit breaking device 600 shown in FIG.

When assembling the electric circuit interrupting device 600, first, the base piece 430 of the part to be interrupted 400 is placed on the mounting part 113 of the lower housing 100, and the separating piece 420 is placed in the lower housing part 110 of the lower housing 100. The blocked portion 400 is arranged so as to cross the. At that time, the fixing claws 411 on both sides of the base piece 430 of the cut-off part 400 are brought into contact with the engaging inner surface 115 and the engaging outer surface 116 of the lower housing 100, respectively, and the fixing part 440 of the base piece 430 is attached to the lower housing. It is fixed so as to fit into the mounting portion 113 of 100.

Then, the base piece 430 is firmly fixed to the mounting portion 113 of the lower housing 100. Since the distance L2 between the fixed parts 440 of the base pieces 430 on both sides is slightly wider than the distance L1 between the opposing mounting parts 113 (L2>L1), the distance (dimension) L2 is wider on both sides. The fixing part 440 is fixed so as to be tightly fitted into the mounting parts 113 on both sides with a narrow distance (dimension) L1, and the separating piece 420 between the base pieces 430 has a pusher so as to be sandwiched between the base pieces 430 on both sides. Pressure F is applied. Then, a pressing force F is applied between the end surfaces 431 of the base pieces 430 in directions facing each other, and the base pieces 430 on both sides can maintain an electrically connected state via the separating piece 420. In particular, since the pressing force F is applied to the end surface 431 of the base piece 430, the contact resistance between the end surface 431 of the base piece 430 and the opposing end surface (the end surface 421 of the separation piece 420) can be kept low. Furthermore, this state can be maintained for a long period of time. Note that keeping the contact resistance between the end surface 431 of the base piece 430 and the opposing end surface (the end surface 421 of the separation piece 420) low means that the end surface 431 of the base piece 430 and the opposing end surface are However, since they are in tighter contact with each other, it becomes easier for current to flow, which means that the electrical resistance between the two end surfaces that are in contact with each other is kept low.

Further, the end surface 431 of the base piece 430, the end surface 421 of the separation piece 420, or the end surface 431 of the base piece 430 and the end surface 421 of the separation piece 420 may be plated to form a plating layer. This plating layer fills the gaps caused by minute irregularities on the surfaces of the end surface 431 of the base piece 430 and the end surface 421 of the separation piece 420 and suppresses oxidation caused by the surrounding environment, so that the contact resistance can be kept low and maintained for a long period of time. Furthermore, this plating layer is made of tin (Sn) or the like, and has a lower hardness than the metal such as copper (Cu) that constitutes the cut-off section 400 (i.e., the separation piece 420 and the base piece 430). There is. As a result, when the pressing force F is applied, the plating layer with low hardness is strongly pressed and crushed by the end surface 431 of the base piece 430 and the end surface 421 of the separation piece 420, which have high hardness. It is possible to more reliably fill gaps caused by minute irregularities on the surface of the end surface 431 and the end surface 421 of the separation piece 420, and to suppress contact resistance to a low level. In addition, the plating layer is made of gold (Au), silver (Ag), etc., and has lower hardness than the metal such as copper (Cu) that constitutes the cut-off section 400, and has a higher electrical resistance than the metal such as copper (Cu). The conductivity may be higher or the same.

Next, the upper housing 200 is fitted onto the lower housing 100 so that the main body 510 side of the movable body 500 is inserted into the upper housing part 210 of the upper housing 200. Then, the insertion portion 213 of the upper housing 200 is fitted into the base piece 430 of the blocked portion 400. In this way, the housing 300 consisting of the lower housing 100 and the upper housing 200 is assembled with the blocked part 400 and the movable body 500 accommodated therein.

Further, a power source P is attached to the power source storage section 221 of the upper housing 200, and a portion of the power source P is accommodated in the recess 511 of the moving body 500. When an abnormality signal is input from the outside when an abnormality is detected in the electric circuit, the power source P explodes the gunpowder inside the power source P, and uses the air pressure caused by the explosion to house the mobile object 500. It is instantaneously pushed out and moved within the section 310. Note that the power source P is not limited to a power source using gunpowder, and may be any other known power source as long as it generates power to move the mobile body 500.

As shown in FIG. 6, the movable body 500 is housed inside a housing section 310 that includes a lower housing section 110 and an upper housing section 210 that are arranged in a straight line. The housing portion 310 extends from a first end 320 of the housing 300 to a second end 330 opposite the first end 320 . Since the movable body 500 is disposed on the first end 320 side where the power source P is disposed, the second end 330 side of the accommodating portion 310 is hollow. Therefore, as will be described later, the movable body 500 can move toward the second end 330 while cutting the separation piece 420. Furthermore, since the recess 511 on the upper end side of the moving body 500 is adjacent to the power source P, the air pressure caused by the explosion of gunpowder in the power source P is transmitted to the upper end side of the moving body 500, as will be described later. .

Note that, as shown in FIG. 6, the assembled and completed electric circuit breaker device 600 is used by being attached to an electric circuit to be protected. Specifically, the base piece 430 of the cut-off section 400 is connected to a part of the electric circuit, so that the cut-off section 400 constitutes a part of the electric circuit. In normal times, the base piece 430 of the section to be interrupted 400 and the separation piece 420 are not disconnected and are physically and electrically connected, so that the current flows between the base piece 430 of the section to be interrupted 400 and the separation piece. 420 in an electrical circuit.

Next, with reference to FIG. 7, a description will be given of how the electrical circuit interrupting device 600 interrupts the electrical circuit when an abnormality such as an overcurrent flowing through the electrical circuit is detected. Note that FIG. 7 is a cross-sectional view showing how the moving body 500 has moved from the state shown in FIG.

First, as shown in FIG. 7, when an abnormality such as overcurrent flowing in the electric circuit is detected, an abnormality signal is input to the power source P, and the explosive in the power source P explodes. Then, the air pressure caused by the explosion is transmitted to the recess 511 on the upper end side of the moving body 500. Due to this air pressure, the movable body 500 is vigorously blown away from the first end 320 toward the second end 330 and instantaneously moves within the housing portion 310 toward the second end 330 .

Then, the protrusion 530 of the movable body 500 strongly pushes the separation piece 420 toward the second end 330, the separation piece 420 is separated from the base piece 430, and the base pieces 430 on both sides are in an electrically disconnected state. Become. In other words, the state in which the base pieces 430 on both sides of the part to be cut off 400 are energized via the separation piece 420 is cut off, and it is possible to prevent overcurrent from flowing in the electric circuit. Note that the force of the protruding portion 530 of the movable body 500 that strongly pushes the separation piece 420 toward the second end portion 330 is greater than the pressing force F caused by the base pieces 430 on both sides sandwiching and holding the separation piece 420, so that the movable body 500 can separate the separation piece 420 from the base piece 430. Furthermore, since the direction of the force of the movable body 500 pushing out the separation piece 420 toward the second end 330 side and the direction of the pressing force F caused by the base pieces 430 on both sides sandwiching and holding the separation piece 420 intersect, The motive power of the movable body 500 is efficiently transmitted to the separation piece 420, and the movable body 500 can easily separate the separation piece 420 from the base piece 430. In particular, when the direction of the force of the movable body 500 pushing out the separation piece 420 toward the second end 330 side is orthogonal to the direction of the pressing force F that causes the base pieces 430 on both sides to sandwich and hold the separation piece 420. , the power of the movable body 500 is more efficiently transmitted to the separation piece 420, and the movable body 500 can more easily separate the separation piece 420 from the base piece 430.

Further, the thickness (plate thickness) of the cut-off section 400 can be made thick like the thickness of the cut-off section in the prior art, and the resistance of the cut-off section 400 is reduced to suppress power loss. In the electric circuit breaking device 600 of the present invention, the separate base pieces 430 are butted against each other with a pressing force F in opposing directions to maintain the electrically connected state. Furthermore, when interrupting an electric circuit, instead of physically cutting the integrally formed part to be cut off with great force as in the past, the connection between the end surfaces 431 of the base piece 430, which were originally separate parts, is Just separate it. Therefore, even when lowering the resistance of the section to be interrupted 400, the electric circuit can be easily interrupted with less power than before, and it is possible to suppress the increase in size and manufacturing cost of the electric circuit interrupting device.

In the electric circuit breaking device 600 according to the first embodiment shown in FIGS. 5 and 6, a pressing force F is applied between the end surfaces 431 of the base pieces 430 in directions facing each other to electrically connect the base pieces 430 to each other. The pressing means for connecting the base piece 430 is in the form of a claw-shaped fixing part 400, but is not limited thereto. In addition, any configuration may be used as long as the base pieces 430 can be electrically connected to each other.

<Embodiment 2>
Next, an electric circuit interrupting device 600A of the present invention according to Embodiment 2 will be described with reference to FIGS. 8 and 9. In addition, FIG. 8 is a perspective view of a to-be-interrupted part 400A and a lower housing 100A of an electric circuit breaker 600A according to the second embodiment, and FIG. 9(a) is a side view of the to-be-interrupted part 400A and a lower housing 100A. FIG. 9(b) is a side view of the blocked portion 400A fixed to the lower housing 100A. Note that the configuration of the electric circuit breaker 600A according to the second embodiment is different from the configuration of the electric circuit breaker 600 according to the first embodiment in the configuration in which the section to be interrupted 400A is fixed to the lower housing 100A, but other configurations are different. is basically the same as the configuration of the electric circuit interrupting device 600 according to the first embodiment, so the description of the same configuration will be omitted.

As shown in FIGS. 8 and 9, a part of the upper surface 120 of the lower housing 100 is provided with a recess that matches the shape of the base piece 430A so that the base piece 430A of the blocked part 400A can be placed thereon. It is provided with a placing part 113A. The placing portion 113A is arranged to face both sides of the lower housing portion 110A, and the placing portion 113A supports the linearly extending portion 400A to be blocked on both sides. Furthermore, a fixing hole 117A is formed in the mounting portion 113A so that a rod-shaped fixing portion 440A of the base piece 430A can be inserted therein. The distance between the opposing fixing holes 117A is L1A.

Further, the cut-off portion 400A is entirely made of a conductor made of metal such as copper in order to be electrically connected to an electric circuit, and has a base piece 430A for connecting to the electric circuit at both ends, and a base piece 430A for connecting to the electric circuit. 420A of separation pieces located between. Furthermore, the base piece 430A includes a fixing part 440A for fixing to the mounting part 113A of the lower housing 100A. This fixing part 440A is formed into a rod shape, and the tip 443A of the fixing part 440A can be inserted into the fixing hole 117A of the mounting part 113A and fixed. Although the separation piece 420A and the base pieces 430A on both sides are separate bodies, they are assembled so that the end face 431A of the base piece 430A and the end face 421A of the separation piece 420A are brought into close contact with each other and electrically and physically connected to each other. be able to. In a state where the separation piece 420A and the base piece 430A are assembled, the distance between the fixing parts 440A of the base pieces 430A on both sides is L2A.

As shown in FIG. 9(b), when the tip 443A of the fixing part 440A of the cut-off part 400A is inserted into the fixing hole 117A of the mounting part 113A of the lower housing 100A, the cut-off part 400A It is firmly fixed to the mounting portion 113A. Since the distance L2A between the fixing parts 440A of the base pieces 430A on both sides is slightly wider than the distance L1A between the opposing fixing holes 117A (L2A>L1A), the fixing parts 440A on both sides have a wider distance (dimension) L2A. is fixed so as to be tightly inserted into the fixed holes 117A on both sides with a narrow distance (dimension) L1A, and a pressing force FA is applied to the separation piece 420A so as to be sandwiched between the base pieces 430A on both sides. Then, a pressing force FA is applied to the end surfaces 431A of the base pieces 430A in directions facing each other, and the base pieces 430A on both sides can maintain an electrically connected state via the separation piece 420A. In particular, since the pressing force FA is applied to the end surface 431A of the base piece 430A, the contact resistance between the end surface 431A of the base piece 430A and the opposing end surface (the end surface 421A of the separation piece 420A) can be kept low. Furthermore, this state can be maintained for a long period of time. As described above, in the electric circuit breaking device 600A of the present invention according to the second embodiment, the pressing force FA in the direction facing each other is applied between the end surfaces 431A of the base pieces 430A to electrically connect the base pieces 430A to each other. The pressing means for connection is in the form of a rod-shaped fixing portion 400A.

Further, in the electric circuit breaking device 600A of the present invention according to the second embodiment, the configuration for separating the separation piece 420A and breaking the electric circuit is the same as that of the electric circuit breaking device according to the first embodiment described in FIGS. 6 and 7. Same as 600. The thickness of the cut-off section 400A can be increased similarly to the thickness of the cut-off section in the prior art, and the resistance of the cut-off section 400A is reduced to suppress power loss. In the electric circuit breaking device 600A of the present invention according to Embodiment 2, the separate base pieces 430A are butted against each other with a pressing force FA in opposing directions to maintain the electrically connected state. . Furthermore, when interrupting an electric circuit, instead of physically cutting the integrally formed part to be interrupted as in the past, the connection state between the end surfaces 431A of the base pieces 430A, which were originally separate pieces, is separated. do it. Therefore, even when reducing the resistance of the section to be interrupted 400A, the electric circuit can be easily interrupted with less power than before, and it is possible to suppress the increase in size and manufacturing cost of the electric circuit interrupting device.

<Embodiment 3>
Next, an electric circuit breaking device 600B of the present invention according to Embodiment 3 will be described with reference to FIGS. 10 and 11. In addition, FIG. 10 is a perspective view of the cut-off part 400B and the lower housing 100B of the electric circuit breaking device 600B according to the third embodiment, and FIG. 11 is a plan view of the cut-off part 400B fixed to the lower housing 100B. It is. The configuration of the electric circuit interrupting device 600B according to the third embodiment is different from the electric circuit interrupting device 600 according to the first embodiment in that the disconnected portion 400B is fixed to the lower housing 100B and the tension spring 450B is provided. Although the configuration is different, the other configurations are basically the same as the configuration of the electric circuit interrupting device 600 according to the first embodiment, so the description of the same configurations will be omitted.

As shown in FIGS. 10 and 11, a part of the upper surface 120A of the lower housing 100A is recessed to match the shape of the base piece 430B so that the base piece 430B of the blocked part 400B can be placed thereon. 113B. This placing part 113B is arranged so as to face both sides of the lower housing part 110B, and the placing part 113B supports the linearly extending part to be blocked 400B on both sides. Further, a convex fixing claw 118B is formed on the mounting portion 113B.

The part to be interrupted 400B is entirely made of a conductor made of metal such as copper in order to be electrically connected to an electric circuit, and has a base piece 430B at both ends for connection to the electric circuit, and a portion between the base piece 430B. and a separation piece 420B located at . Furthermore, mounting portions 435B are provided at both ends of the base piece 430B, on which the ends of the tension spring 450B can be hooked and fixed. Insulation treatment is applied to both ends (451B, 452B) of the tension spring 450B. Further, the mounting portion 435B of the base piece 430B may be subjected to insulation treatment.

Furthermore, the base piece 430B includes a fixing part 440B for fixing to the mounting part 113B of the lower housing 100B. This fixing part 440B is formed in a notch shape, and can be fixed by engaging with the fixing claw 118B of the mounting part 113B. Therefore, after the separation piece 420B is separated, the base piece 430B can be prevented from being pulled and moved by the tension spring 450B.

As shown in FIGS. 10 and 11, although the separation piece 420B and the base pieces 430B on both sides are separate bodies, the end surface 431B of the base piece 430B and the end surface 421B of the separation piece 420B are brought into close contact with each other to provide electrical and They can be assembled so that they are physically connected to each other. At this time, one end 451B of the tension spring 450B is attached to the attachment part 435B of one base piece 430B, and the other end 452B of the tension spring 450B is attached to the attachment part 435B of the other base piece 430B. . Therefore, due to the tensile force of the tension spring 450B, a pressing force FB is applied to the separating piece 420B between the base pieces 430B so that it is sandwiched between the base pieces 430B on both sides. Then, a pressing force FB in directions facing each other is applied to the end surfaces 431B of the base pieces 430B, and the base pieces 430B on both sides can maintain an electrically connected state via the separating pieces 420B. In particular, since the pressing force FB is applied to the end surface 431B of the base piece 430B, the contact resistance between the end surface 431B of the base piece 430B and the opposing end surface (the end surface 421B of the separation piece 420B) can be kept low. Furthermore, this state can be maintained for a long period of time. As described above, in the electric circuit breaking device 600B of the present invention according to the third embodiment, the pressing force FB in the direction facing each other is applied between the end surfaces 431B of the base pieces 430B to electrically connect the base pieces 430B to each other. The pressing means to be connected is in the form of a tension spring 450B. Further, by changing the tensile force of the tension spring 450B, the magnitude of the pressing force FB can be changed as appropriate.

In addition, in the electric circuit breaking device 600B of the present invention according to Embodiment 3, the configuration for separating the separation piece 420B to interrupt the electric circuit is different from the electric circuit breaking device 600B of the present invention according to Embodiment 1, which is explained in FIGS. 6 and 7. It is the same as circuit breaker device 600. The thickness of the cut-off section 400B can be increased similarly to the thickness of the cut-off section in the prior art, and the resistance of the cut-off section 400B is reduced to suppress power loss. In the electric circuit breaking device 600B of the present invention according to Embodiment 3, the separate base pieces 430B are butted against each other with a pressing force FB in opposing directions to maintain the electrically connected state. . Furthermore, when interrupting the electric circuit, instead of physically cutting the integrally formed part to be interrupted as in the past, the connection state of the end surfaces 431B of the base pieces 430B, which were originally separate pieces, is separated. Bye. Therefore, even when reducing the resistance of the section to be interrupted 400B, the electric circuit can be easily interrupted with less power than before, and the size and cost of the electric circuit interrupting device can be suppressed.

<Embodiment 4>
Next, an electric circuit breaking device 600C of the present invention according to Embodiment 4 will be described with reference to FIGS. 12 and 13. Note that FIG. 12(a) is a perspective view of a cut-off portion 400C of an electric circuit breaking device 600C according to the fourth embodiment, and FIG. 12(b) is a perspective view of a cut-off portion 400C of the electric circuit breaking device 600C according to the fourth embodiment. FIG. 13 is an exploded perspective view showing the cut-off part 400C, the lower housing 100C, and the movable body 500C, and FIG. 14 shows the electric circuit interrupting device 600C in the same way as shown in FIG. The cross-sectional view of FIG. 15 is a cross-sectional view of a state in which the movable body 500C has moved from the state shown in FIG. 14. Note that the configuration of the electric circuit interrupting device 600C according to the fourth embodiment is different from the configuration of the electric circuit interrupting device 600 according to the first embodiment in the configurations of the moving body 500C and the section to be interrupted 400C, but the other configurations are the same as those in the embodiment. Since the configuration is basically the same as the configuration of the electric circuit interrupting device 600 according to the first embodiment, a description of the same configuration will be omitted.

As shown in FIG. 12, the cut-off portion 400C is entirely made of a conductor made of metal such as copper in order to be electrically connected to an electric circuit, and has base pieces 430C at both ends for connection to the electric circuit. Equipped with Similar to the blocked part 400 of the first embodiment shown in FIG. 4, the blocked part 400C includes a fixing part 440C for fixing to the mounting part 113C of the lower housing 100C. However, the cut-off section 400C does not include the separation piece 420 like the cut-off section 400 of Embodiment 1 shown in FIG. . Specifically, the distal end side of the base piece 430C is a bending part 437C that can be bent by being pressed by a moving body 500C, which will be described later. A score line 438C that crosses in the width direction is provided. Further, an end surface 431C of the base piece 430C is a flat surface that extends in the thickness direction of the blocked portion 400C. Furthermore, the base piece 430C includes a protruding surface 432C protruding from the end surface 431C and a recessed surface 433C recessed from the end surface 431C.

As shown in FIG. 12(b), although the base pieces 430C on both sides are separate pieces, they are assembled so that the end surfaces 431C of the base pieces 430C are brought into close contact with each other and electrically and physically connected to each other. I can do it. At this time, since the protruding surface 432C of one base piece 430C is fitted into the recessed surface 433C of the other base piece 430C, the assembled base pieces 430C are prevented from shifting from each other. In addition, when the base pieces 430C on both sides are assembled, the distance between the fixing parts 440C of the base pieces 430C on both sides is L2C. Although the base piece 430C includes both a protruding surface 432C and a recessed surface 433C, the present invention is not limited to this, and may include only one of the protruding surface 432C or the recessed surface 433C.

Moreover, as shown in FIG. 13, when attaching the cut-off part 400C to the lower housing 100C, the base piece 430C of the cut-off part 400C is placed on the mounting part 113C of the lower housing 100C, and the base piece 430C The blocked portion 400C is arranged such that the bent portion 437C crosses the lower accommodation portion 110 of the lower housing 100. Further, the lower housing 100C has the same configuration as the lower housing 100 of the first embodiment. Similarly to the method of fixing the lower housing 100 and the blocked part 400 in Embodiment 1, as shown in FIG. fixed to match.

Then, as shown in FIG. 14, the base piece 430C is firmly fixed to the mounting portion 113C of the lower housing 100C. Since the distance L2C between the fixing parts 440C of the base pieces 430C on both sides is slightly wider than the distance L1C between the opposing mounting parts 113C (L2C>L1C), the distance (dimension) L2C is wider on both sides. The fixing portion 440C is fixed so as to be tightly fitted into the mounting portions 113C on both sides with a narrow distance (dimension) L1C, and a pressing force FC is applied to the end surface 431C of the base piece 430C in the direction opposite to each other. The base piece 430C can remain electrically connected. In particular, since the pressing force FC is applied to the end surfaces 431C of the base pieces 430C, the contact resistance between the end surfaces 431C of the base pieces 430C can be kept low, and furthermore, this state can be maintained for a long period of time. .

Next, as shown in FIG. 15, if an abnormality such as an overcurrent flowing through the electric circuit is detected, an abnormality signal is input to the power source PC, and the gunpowder in the power source PC explodes. The movable body 500C is blown away from the first end 320C toward the second end 330C, and instantly moves inside the housing section 310C toward the second end 330C. Note that the protruding portion 530C of the movable body 500C has a sharp tip and is located directly above the point where the end surfaces 431C of the base piece 430C are in contact with each other.

Then, the protrusion 530C of the movable body 500C strongly pushes out the vicinity of the boundary between the end surfaces 431C of the base piece 430C toward the second end 330C. Then, the bent portions 437C of the base pieces 430C on both sides are bent toward the second end 330 by the protrusion 530C of the movable body 500C, and are separated from each other, so that the base pieces 430C on both sides are electrically disconnected. state. In other words, the base pieces 430C on both sides of the cut-off section 400C contact each other and the energized state is cut off, making it possible to prevent overcurrent from flowing in the electric circuit. Note that the force with which the protrusion 530C of the movable body 500C bends the bent portion 437C of the base piece 430C toward the second end 330C is greater than the pressing force FC, so the movable body 500C bends the bent portion 437C of the base piece 430C. can be bent toward the second end 330C to separate the bent portions 437C on both sides from each other.

Furthermore, since the direction of the force that causes the protruding portion 530C of the movable body 500C to bend the bending portion 437C of the base piece 430C toward the second end 330C side and the direction of the pressing force FC intersect, the motive force of the movable body 500C is is efficiently transmitted to the bending portion 437C, and the movable body 500C can easily bend the bending portion 437C. In particular, when the direction of the force that causes the protrusion 530C of the moving body 500C to bend the bent portion 437C of the base piece 430C toward the second end 330C is perpendicular to the direction of the pressing force FC, Power is transmitted to the bending portion 437C more efficiently, and the movable body 500C can bend the bending portion 437C more easily.

Further, the thickness of the cut-off section 400C can be made thick like the thickness of the cut-off section in the prior art, and the resistance of the cut-off section 400C is reduced to suppress power loss. In the electric circuit breaking device 600C of the present invention, the separate base pieces 430C are butted against each other with a pressing force FC in opposing directions to maintain the electrically connected state. Furthermore, when interrupting an electric circuit, instead of physically cutting the integrally formed part to be interrupted as in the past, it is necessary to separate the contact state of the end surfaces 431C of the base pieces 430C, which were originally separate pieces. Bye. Therefore, even when reducing the resistance of the part to be interrupted, the electric circuit can be easily interrupted with less power than before, and it is possible to suppress the increase in size and manufacturing cost of the electric circuit interrupting device.

<Embodiment 5>
Next, an electric circuit breaking device 600D of the present invention according to Embodiment 5 will be described with reference to FIG. 16. Note that FIG. 16(a) is a perspective view of a section to be interrupted 400D of an electric circuit interrupting device 600D according to the fifth embodiment, and FIG. 16(b) is a side view of the section to be interrupted 400D. Note that the configuration of the electric circuit interrupting device 600D according to the fifth embodiment is different from the disconnected portion 400A of the electric circuit interrupting device 600A according to the second embodiment in the thickness of the disconnected portion 400D, but the other configurations are different from those in the embodiment. Since the configuration is basically the same as that of the electric circuit interrupting device 600A according to the second embodiment, the explanation of the same configuration will be omitted.

As shown in FIG. 16, in the blocked portion 400D, the thickness of the portion where the end surface 431D of the base piece 430D and the end surface 421D of the separation piece 420D contact is W1. Moreover, on the opposite side of the end surface 431D of the base piece 430D, the thickness of an external connection terminal 439D connected to an external electric circuit is W2. The thickness W1 of the contact portion is larger than the thickness W2 of the external connection terminal 439D (W1>W2). In this way, by locally increasing the thickness W1 of the contact point between the end surface 431D of the base piece 430D and the end surface 421D of the separation piece 420D compared to other parts, The contact area with the end surface 421D can be made wider, and as a result, the resistance at the contact point can be lowered and power loss can be suppressed.

Further, the electric circuit interrupting device of the present invention is not limited to the above embodiments, and various modifications and combinations are possible within the scope of the claims and the embodiments, and these modifications , combinations are also included within the scope of the right.

Claims

housing and
a part to be interrupted that is disposed within the housing and constitutes a part of the electric circuit;
a power source disposed on the first end side of the housing;
An electric circuit breaker comprising: a movable body that moves within the housing between the first end and a second end opposite to the first end;
The blocked portion includes two physically separate base pieces,
A pressing force is applied between the end surfaces of the base pieces in directions facing each other to electrically connect the base pieces,
The movable body is configured such that while the movable body is moved from the first end toward the second end by the power source, a part of the movable body interrupts the connection between the base pieces. An electric circuit breaking device characterized by:
a separation piece is provided between the base pieces;
The electric circuit breaker device according to claim 1, wherein the separating piece is pressed and sandwiched between the base pieces on both sides by the pressing force.
In the to-be-interrupted portion, the thickness of the portion where the end face of the separation piece and the end face of the base piece come into contact is greater than the thickness of the external connection terminal that connects the base piece and the electric circuit. The electric circuit interrupting device according to claim 2.
The electrical appliance according to any one of claims 1 to 3, wherein the end face of the base piece or the end face of the separation piece is plated with a metal whose hardness is lower than that of the metal constituting the cut-off part. circuit breaker.
The electric circuit breaking device according to any one of claims 1 to 4, wherein an end face of the base piece or an end face of the separation piece is provided with a recessed face or a protruding face that can be fitted.