JP6632433B2 - Actuator - Google Patents

Description

  The present invention relates to an actuator that applies a predetermined force to an object via an output piston.

  In some cases, an electric circuit is provided with a cutoff device that operates when an abnormality occurs in a device included in the electric circuit or when an abnormality occurs in a system in which the electric circuit is mounted, thereby cutting off conduction between the devices. As one mode, a conduction interrupting device has been proposed in which a cutting member is moved at high speed by high-pressure gas to forcibly and physically cut a conductor interposed between devices. For example, in the technique of Patent Literature 1, a cutting member is driven by a high-pressure gas generated by a gas generator to cut a conductor forming a part of an electric circuit, and a conductor generated by the cutting is used. The arc generated between the cut ends is extinguished. As a result, more reliable conduction interruption is achieved.

  Actuators for pressurization using the combustion energy of explosives have also been developed. For example, Patent Literature 2 discloses a technique related to an actuator for driving a control member through a membrane using the combustion energy of an explosive to cut off the flow of a medium in a flow path. In this technique, the elastically deformable film sandwiched between the control member and the housing is deformed by receiving the combustion pressure of the explosive, and the control member is driven by displacing the cylinder attached to the film. Things.

JP 2014-49300 A U.S. Pat. No. 6,397,595

  In order to efficiently use the combustion energy of explosive as a power source in an actuator that applies a predetermined force to an object, it is necessary to efficiently transmit the generated combustion energy to an output piston section of the actuator. For that purpose, it is important to seal the combustion products generated by the combustion of the explosive in a certain closed space and increase the pressure inside.

  On the other hand, a space in which the explosive is burned by an elastically deformable film as in the prior art is distinguished from a space in which the output portion (control member) of the actuator to be pressurized is arranged. When the combustion energy is transmitted to the control member through the deformation of the film, the film is rapidly elastically deformed during combustion. On the other hand, in order to displace the control member by a necessary distance, the film must be significantly elastically deformed toward the control member by the combustion of the explosive, and in some cases, the film may be damaged or cracked. If the film is damaged or the like, the combustion products cannot be sealed in the space on the combustion side, and it becomes difficult to drive the control member.

  In view of the above-described problem, an object of the present invention is to appropriately transmit energy for driving an output unit of an actuator driven by explosive combustion to the output unit.

  In order to solve the above-mentioned problems, the present invention provides a sealing member that divides a space inside an actuator body into an ignition device side and an output piston portion side. A configuration was adopted in which sealing was performed in the space. With such a configuration, the pressure in the space on the ignition device side can be appropriately increased. Further, the contact portion of the sealing member with the output piston moves from the starting position on the ignition device side to the operating position on the output surface side with respect to the fixed end of the sealing member due to combustion in the ignition device. Configuration was adopted. According to such a configuration, the seal member is less likely to be torn while the movement amount of the output piston portion is appropriately secured, so that the transmission of the driving energy to the output piston portion becomes preferable.

  Specifically, the present invention includes an actuator main body having a through hole formed in an axial direction, and an output piston portion slidably disposed in the through hole, wherein the output piston portion is provided with the actuator An actuator for applying a predetermined force to an object by projecting from an output surface of a main body, wherein the ignition device burns an explosive, and the output piston portion is slid by the explosive combustion in the ignition device. Device for applying drive energy to the output piston portion, and a space in the actuator body is divided into a first space in which the ignition device is disposed and a second space in which the output piston portion is disposed. A sealing member for sealing the combustion products generated by the ignition device in the first space. Further, the output piston portion has a working end portion acting on the object and a predetermined end portion having a predetermined end surface for receiving the driving energy, and the sealing member is provided inside the actuator body. A fixed end fixed to an inner wall defining a space; and a contact portion that comes into contact with the predetermined end surface of the predetermined end when explosive combustion occurs in the ignition device. Furthermore, in a state before explosive combustion in the ignition device, the contact portion is located at a start position on the ignition device side with respect to the fixed end portion, and due to explosive combustion in the ignition device, the contact portion is The output piston portion is configured to be brought into contact with the predetermined end surface and to move to an operation position on the output surface side with respect to the fixed end portion as the output piston portion slides.

  In the actuator according to the present invention, by dividing the inside of the actuator body into the first space and the second space by the sealing member, the pressure in the first space can be effectively increased at the time of combustion of the explosive in the ignition device. . Then, due to the drive energy generated by the combustion of the explosive in the ignition device, the contact portion of the sealing member moves from the starting position to the operating position, and contacts the predetermined end surface of the output piston portion in the course of the movement. The part slides in the through hole. In addition, a predetermined force acts on the target object by the action end projecting from the output surface due to the sliding of the output piston portion. The predetermined force is appropriately set according to the purpose of acting on the object. For example, in order to destroy an object, a force required for the destruction is set to a predetermined force. If the movement of the contact portion in the sealing member is caused by the combustion of the explosive, a configuration in which the drive energy is directly applied to the output piston portion through the contact portion, or the drive energy is temporarily changed to another gas, A configuration in which the light is propagated to a liquid, a solid, or the like, and then indirectly acts on the output piston portion via the contact portion can be appropriately adopted.

  Here, in the actuator according to the present invention, the igniter that burns the explosive means that the igniter contained in the igniter is ignited by the execution of the igniter to generate a combustion product of the igniter. Alternatively, a known gas generating agent (for example, a single-base smokeless powder) may be further burned by the ignition of the igniter to generate a combustion product of the igniter and the gas generating agent. Of course, in the actuator of the present invention, the specific configuration of the ignition device is not limited.

When the explosive burns in such an igniter, the combustion product is diffused into the first space in the actuator main body, and the internal pressure is increased, so that the driving energy is transmitted to the output piston portion, and the energy is transmitted. As described above, it is a power source for driving the output piston. Here, since the actuator according to the present invention includes the sealing portion, the combustion products are sealed in the first space and do not enter the second space. Therefore, the drive energy due to the combustion products is not unnecessarily diffused, and transmission to the output piston portion is expected. In order to further enhance the sealing effect, the sealing member needs to have a certain degree of resistance to the combustion of the explosive. On the other hand, the provision of the sealing member allows the drive energy to be output to the piston. It is not preferred that the transmission of is transmitted. Therefore, the sealing member needs to achieve both a favorable sealing of the combustion products and a favorable transmission of the driving energy to the output piston portion.

  Therefore, the sealing member is configured such that the contact portion has a predetermined position of the output piston portion from the starting position on the ignition device side to the operation position on the output surface side with respect to the fixed end fixed to the inner wall of the space in the actuator body. It is configured to move in contact with the end face. With such a configuration, after the explosive combustion, the sealing member is deformed so that the contact portion is turned over with respect to the fixed end portion, and the sliding of the output piston portion is promoted. Therefore, the sealing member is not greatly extended in only one direction at the time of explosive combustion as in the related art, and the sealing member is less likely to be damaged. Further, when the above-mentioned inverted structure is adopted, when the output piston is slid, the moving range of the contact portion is from the starting position on the ignition device side to the fixed end portion from the starting position on the output surface side, and Although the amount of movement of the contact portion corresponding to the sliding distance of the output piston portion for the action of the predetermined force is secured, the sealing member does not need to undergo large deformation, so that the sealing member is damaged. It becomes difficult. This contributes to a good sealing of the combustion products and a good transmission of the driving energy to the output piston portion.

  In the actuator according to the present invention, the sealing member may be formed of an elastic member. Thereby, the sealing member is extended at the time of the explosive combustion in the igniter, so that more preferably the compatibility of the sealing of the combustion product and the transmission of the driving energy to the output piston portion can be achieved.

  Further, the sealing member covers a side surface of the predetermined end portion along a sliding direction of the output piston portion in a state before the explosive combustion in the ignition device, so that the fixed end portion and the contact portion are in contact with each other. It may further have an intermediate portion formed between the output piston portion, in which case the intermediate portion extends in the sliding direction with the sliding of the output piston portion by the explosive combustion in the ignition device. The contact portion is configured to move from the starting position to the operating position. In the actuator configured as described above, the contact portion moves while the intermediate portion of the sealing member extends in the sliding direction of the output piston portion, and the output piston portion is propelled. A sliding amount corresponding to the extension is given. By such an action, the driving energy by the explosive combustion is suitably used for propelling the output piston portion, and it is possible to appropriately secure the sliding amount of the output piston portion. Further, since the intermediate portion extending in the sliding direction of the output piston portion is formed of an elastic member, the intermediate portion can be extended flexibly, and as a result, the sealing member is less likely to be damaged.

  In the actuator, an outer diameter of the output piston portion at the predetermined end may be smaller than an inner diameter of the through hole. In this case, the intermediate portion extends in the sliding direction along the inner wall surface of the through hole as the output piston portion slides due to the explosive combustion in the ignition device. According to such a configuration, the output piston portion has a gap in the radial direction with respect to the through hole near the predetermined end. Then, when the contact portion moves due to the combustion of the explosive, the intermediate portion can be extended by using the gap, so that the intermediate portion can be easily extended. As a result, it is possible to appropriately secure the sliding amount of the output piston portion, and it is possible to avoid damage to the sealing member.

Further, in the actuator described above, the auxiliary piston portion further slidable in the through-hole and disposed on the first space side, wherein the contact portion of the sealing member is formed by the output piston portion. An auxiliary piston portion interposed between the predetermined end surface and the auxiliary piston portion may be further provided. In this case, the auxiliary piston portion is opposed to the ignition device, the ignition device side end portion to which the driving energy is input, and an output for transmitting the driving energy to the predetermined end surface of the output piston portion via the contact portion. And a piston portion side end.

  In the actuator configured as described above, the driving energy from the ignition device is received by the ignition device side end of the auxiliary piston portion, and the output piston portion and the auxiliary piston are formed by the other end, the output piston portion side end. The driving energy is transmitted to a predetermined end surface of the output piston portion via a contact portion of the sealing member sandwiched between the portions. Therefore, the sealing member does not directly receive the driving energy from the ignition device, but receives the driving energy via the auxiliary piston member. As a result, at the time of explosive combustion, the contact portion is not directly exposed to the high-temperature and high-pressure combustion products, so that the sealing member including the contact portion can be more reliably prevented from being damaged. Further, since the contact portion is sandwiched between the output piston portion and the auxiliary piston portion, a force for turning the sealing member upside down as described above can be appropriately applied to the sealing member, thereby providing a smooth output. Sliding of the piston can be expected.

  ADVANTAGE OF THE INVENTION According to this invention, in the actuator driven by explosive combustion, it becomes possible to transmit suitably the energy for driving the output part to the said output part.

It is a figure showing the schematic structure of the actuator concerning a 1st embodiment of the present invention. FIG. 2 is a diagram illustrating details of a piston of the actuator illustrated in FIG. 1. FIG. 2 is a diagram illustrating a schematic configuration of an initiator (ignition device) mounted on the actuator illustrated in FIG. 1. FIG. 2 is a diagram showing a comparison between a state before combustion of explosives and a state after combustion in an initiator in the actuator shown in FIG. 1. It is a figure showing the schematic structure of the electric circuit cutoff device to which the actuator concerning a 1st embodiment of the present invention is applied. It is a figure showing the schematic structure of the actuator concerning a 2nd embodiment of the present invention.

  Hereinafter, an actuator according to an embodiment of the present invention will be described with reference to the drawings. The configurations of the following embodiments are exemplifications, and the present invention is not limited to the configurations of these embodiments.

<First embodiment>
FIG. 1 is a sectional view when the actuator 1 is cut in the axial direction. Here, the actuator 1 has an actuator body 2 composed of a first housing 3 and a second housing 4, and is connected to the distal end side of the actuator body 2 (the second housing 4 is connected to the first housing 3). The end opposite to the end of the actuator 1) is the output side of the actuator 1, that is, the side on which the object on which a predetermined force is applied is arranged. Further, the first housing 3 and the second housing 4 are fixed with screws to be integrated. Here, inside the first housing 3, a combustion chamber 31 which is an internal space extending in the axial direction is formed, and inside the second housing 4, similarly, in the axial direction. A through hole 37 which is an internal space extending is formed. The combustion chamber 31 and the through-hole 37 are internal spaces that are separated by a sealing member 8 described later, but are continuously arranged inside the actuator body 2.

  The front end side of the actuator body 2, that is, the surface on the front end side of the second housing 4 forms an output surface 4b. When the actuator 1 is used, the output surface 4b faces the object on which a predetermined force is applied. Here, a metal output piston 6 is disposed in a through hole 37 in the second housing 4 of the actuator body 2, and the output piston 6 is slidably held in the through hole 37.

  Here, the details of the output piston 6 are shown in FIG. 2 so that the positional relationship with the second housing 4 can be grasped. The output piston 6 is formed in a substantially axial shape extending along the axial direction of the through hole 37, and has an end (hereinafter, referred to as a “first end”) 6 a on the combustion chamber 31 side and an output surface 4 b side. An end, that is, an end (hereinafter, referred to as a “second end”) 6 b for applying a predetermined force to the object, and allowing the output piston 6 to slide smoothly in the through hole 37. An O-ring 6 c is arranged around the output piston 6.

  Here, the first housing 3 (indicated by a dotted line in FIG. 2) and the second housing 4 are attached to form the actuator main body 2 and before the explosive combustion is performed by the initiator 20 which is an ignition device described later. In a state (hereinafter, referred to as a “pre-combustion state”), the first end 6 a extends from the end face of the fitting portion 4 a of the second housing 4 fitted in the combustion chamber 31 of the first housing 3 to the combustion chamber 31. It is in a state of substantially protruding to the side. The diameter d1 of the first end 6a is smaller than the diameter d0 of the through hole 37. Therefore, when the output piston 6 slides in the through hole 37 toward the output surface 4 b, the gap between the side surface of the first end 6 a (the surface along the axial direction of the output piston 6) and the inner wall surface of the through hole 37. Thus, a certain gap is formed. In the pre-combustion state, the end surface of the second end 6b is flush with the output surface 4b, or is located at a position where it enters the through hole 37 from the output surface 4b. Therefore, as shown in FIG. 5 described later, when the actuator 1 is used, the output surface 4b is brought into contact with an object on which a predetermined force is applied, and the actuator 1 is arranged and fixed.

  Here, in the pre-combustion state shown in FIG. 1, the sealing member 8 is fixed on an end surface of the fitting portion 4 a of the second housing 4, which is a part of the inner wall of the actuator main body 2. The space in the actuator main body 2 formed of an elastic material is divided into a space including the combustion chamber 31 located on the initiator 20 side (corresponding to a first space according to the present invention) and a through hole 37 located on the output piston 6 side. And a space (corresponding to a second space according to the present invention), whereby the combustion products generated by the explosive combustion in the initiator 20 are sealed in the combustion chamber 31. . The details of the structure of the sealing member 8 and the operation by the explosive combustion in the initiator 20 will be described later.

  Here, an example of the initiator 20 will be described with reference to FIG. The initiator 20 is an electric ignition device, and a space for disposing the ignition charge 22 is defined in the cup 21 by a cup 21 whose surface is covered with an insulating cover. The metal header 24 is arranged in the space, and the cylindrical charge holder 23 is provided on the upper surface. The ignition charge 22 is held by the charge holder 23. A bridge wire 26 that electrically connects one conductive pin 28 and the metal header 24 is wired on the bottom of the ignition charge 22. The two conductive pins 28 are fixed to the metal header 24 via the insulator 25 so that they are insulated from each other when no voltage is applied. Further, the opening of the cup 21 from which the two conductive pins 28 supported by the insulator 25 extend is protected by a resin collar 27 while maintaining good insulation between the conductive pins 28.

  In the initiator 20 configured as described above, when a voltage is applied between the two conductive pins 28 by an external power supply, a current flows through the bridge wire 26, and the ignition charge 22 burns. At this time, combustion products generated by combustion of the ignition charge 22 are ejected from the opening of the charge holder 23. The initiator cap 14 has a flange-like cross section so as to be hooked on the outer surface of the initiator 20 and is fixed to the first housing 3 with screws. Thus, the initiator 20 is fixed to the first housing 3 by the initiator cap 14, so that the initiator 20 itself can be prevented from dropping off from the actuator main body 2 due to the pressure generated when the initiator 20 ignites.

  Here, the explosive 22 used in the actuator 1 is preferably an explosive containing zirconium and potassium perchlorate (ZPP), an explosive containing titanium hydride and potassium perchlorate (THPP), titanium and potassium perchlorate. Explosive (TiPP), explosive containing aluminum and potassium perchlorate (APP), explosive containing aluminum and bismuth oxide (ABO), explosive containing aluminum and molybdenum oxide (AMO), explosive containing aluminum and copper oxide ( (ACO), an explosive containing aluminum and iron oxide (AFO), or an explosive consisting of a combination of a plurality of these explosives. These explosives generate high-temperature, high-pressure plasma during combustion immediately after ignition, but exhibit a characteristic that when they reach room temperature and combustible organisms condense, they do not contain gaseous components and the generated pressure drops rapidly. Note that other explosives may be used as the ignition charge.

  Here, although nothing is arranged in the combustion chamber 31 shown in FIG. 1, a gas generating agent that generates gas by burning by a combustion product generated by the combustion of the ignition charge 22 is arranged in the combustion chamber 31. You may do so. If the gas generating agent is disposed in the combustion chamber 31, a single-base smokeless explosive composed of 98% by mass of nitrocellulose, 0.8% by mass of diphenylamine and 1.2% by mass of potassium sulfate is given as an example. It is also possible to use various gas generating agents used in gas generators for airbags and gas generators for seatbelt pretensioners. Unlike the case where only the igniter 22 is used, such a combination use of the gas generating agent causes the predetermined gas generated at the time of combustion to contain a gas component even at room temperature, so that the rate of decrease in the generated pressure is small. Further, the combustion completion time of the gas generating agent during combustion is extremely long as compared with the ignition charge 22, but the size, size and shape of the gas generating agent when disposed in the combustion chamber 31, especially the surface By adjusting the shape, the combustion completion time of the gas generating agent can be changed. By adjusting the amount, shape, and arrangement of the gas generating agent in this manner, the pressure generated in the combustion chamber 31 can be appropriately adjusted.

  Here, the details of the sealing member 8 in the state before combustion will be described. As shown in FIG. 1, the sealing member 8 is formed so as to cover the first end 6a of the output piston 6 which protrudes toward the combustion chamber 31 side. Specifically, the sealing member 8 includes a fixed end portion 35 fixed on the fitting portion 4a of the second housing 4 and a contact portion positioned to contact the end surface of the first end portion 6a and cover the end surface. 34, and an intermediate portion 36 formed between the contact portion 34 and the fixed end portion 35 so as to cover the side surface portion of the first end portion 6a. Therefore, as shown in FIG. 1, in a cross section along the axial direction of the actuator 1, the sealing member 8 is formed in a U-shape, and the contact portion 34 corresponding to the bottom surface is in contact with the fixed end portion 35. It will be located at the starting position on the initiator 20 side (left side in FIG. 1).

  Here, the movement of the sealing member 8 when the ignition charge 22 of the initiator 20 burns and the injection state of the injection liquid in the actuator 1 will be described with reference to FIG. 4 shows the configuration of the actuator 1 in a pre-combustion state in the upper part, and shows the configuration of the actuator 1 in a state in which the actuator 1 is activated by the combustion of the ignition charge 22 (hereinafter, referred to as an “operational state”). . In the comparison between the pre-combustion state and the operation state in FIG. 4, the positions of the fixed ends 35 of the sealing member 8 are aligned, and both states are displayed side by side in the axial direction of the actuator 1. The position of the fixed end 35 common to both states is indicated as X0, and the reference line including the position X0 is indicated as L0.

Further, in the pre-combustion state, the position of the contact portion 34 is indicated by X1, and is on the initiator 20 side with respect to the position X0 as described above. The position of the end face of the second end 6b of the output piston 6 at this time is indicated by F1. Here, when the igniter 22 burns, combustion products diffuse into the combustion chamber 31 and the pressure in the combustion chamber 31 increases. As a result, the pressure is applied to the sealing member 8 as well. In particular, the pressure for pressing the output piston 6 toward the output surface 4 b is applied to the output piston 6 via the contact portion 34 of the sealing member 8. The applied pressure.
Therefore, the end face of the first end 6 a of the output piston 6 with which the contact portion 34 comes into contact is the end face that receives the driving energy from the initiator 20.

  Thus, the contact portion 34 is a portion of the sealing member 8 that transmits the driving energy generated by the combustion of the ignition charge 22 to the output piston 6 side. As a result, in the sealing member 8, the contact portion 34 moves to the output surface 4 b side and the output piston 6 slides in the through hole 37. Accordingly, the second end 6b of the output piston 6 projects from the output surface 4b, and the amount of the projection is linked to the sliding amount of the output piston 6. As a result, the output piston 6 can apply a predetermined force to the object arranged on the output surface 4b side. Here, in the operation state in which the sliding of the piston 6 is completed, the output piston is provided on the stopper portion 4c of the second housing 4 which forms a reduced-diameter portion having a smaller inner diameter near the output surface 4b of the through hole 37. 6 are in contact with each other, and the output piston 6 is prevented from jumping out of the through hole 37. The position of the contact portion 34 in this state is the operation position and is indicated by X2, and is on the output surface 4b side with respect to the position X0. The position of the end face of the second end 6b is indicated by F2.

  Thus, in the actuator 1, in the process of burning the ignition charge 22, the contact portion 34 of the sealing member 8 moves from the starting position X1 in the pre-combustion state to the operating position X2 in the operating state. The movement distance (X2-X1) due to the movement of the contact portion 34 corresponds to the movement distance (F2-F1) of the output piston 6 for applying a predetermined force. Then, with this movement, the sealing member 8 is deformed to be turned upside down. That is, the moving distance of the output piston 6 necessary for applying the predetermined force is secured by the reversing deformation of the sealing member 8. In the case where the sealing member 8 is deformed to be turned over in this way, the sealing member 8 itself does not need to undergo large elastic deformation, and mainly the displacement of the intermediate portion 36 and the contact portion 34 excluding the fixed end 35. Even if the contact portion 34 is largely displaced to the output surface 4b side by the driving energy generated by the combustion of the ignition charge 22, the intermediate portion 36 is extended, first, the intermediate portion 36 first moves to the upper part of FIG. Moves from the start position shown in FIG. 4 to the output surface 4b side, and then expands with the displacement of the contact portion 34. Therefore, the amount of elastic deformation of the intermediate portion 36 itself can be kept small, and the breakage of the sealing member 8 can be suppressed while securing a sufficient moving distance of the output piston 6 for the action of the predetermined force. As a result, the drive energy due to combustion can be suitably transmitted to the output piston 6, and the operation of the actuator 1 can be performed efficiently.

  As described above, the diameter d1 of the first end 6a of the output piston 6 is smaller than the inner diameter d0 of the through hole 37. Therefore, when the above-described deformation of the sealing member 8 is performed, the intermediate portion 36 enters the gap between the first end portion 6a and the through-hole 37, and the deformation is reversed along the inner wall surface of the through-hole 37. And elongation can be performed smoothly. The contact portion 34 does not necessarily need to be in contact with the end face of the first end 6a of the output piston 6 when in the operating position.

(Application example)
Here, FIG. 5 shows an electric circuit breaker 100 as an example to which the actuator 1 is applied. The electric circuit breaker 100 is formed by fixing the actuator 1 to the conductor piece 50 via the housing 62.

The conductor piece 50 forms a part of the electric circuit when the electric circuit breaker 100 is attached to the electric circuit, and includes a first connection portion 51 at both ends, a second connection portion 52, and both connection portions. It is a plate piece composed of a cutting portion 53 between them. Each of the first connection portion 51 and the second connection portion 52 is provided with connection holes 51a and 52a for connecting to another conductor (for example, a lead wire) in an electric circuit. Although the conductor piece 50 shown in FIG. 5 is formed such that the first connection portion 51 and the second connection portion 52 and the cut portion 53 are formed in a stepped shape, the first connection portion 51 and the second connection portion Part 52
And the cut portions 53 may be formed so as to be arranged substantially in the same straight line. The cutting section 53 is fixed so as to contact the output surface 4b of the actuator 1. Therefore, the end face of the output piston 6 in the actuator 1 (the end face of the second end 6b) is in a state of facing the cutting portion 53. The conductor piece 50 thus formed is the target in the above embodiment, and in particular, the cut portion 53 is a portion on the target where the predetermined force from the actuator 1 acts.

  Further, a box-shaped insulating portion 60 made of a synthetic resin is formed in the housing 62 on the opposite side of the actuator 1 with the cutting portion 53 therebetween, and an insulating space 61 is formed therein.

  In the electric circuit breaker 100 configured as described above, when the initiator 20 is operated by a trigger signal or when the initiator 20 is manually operated, the output piston 6 slides as described above, and the kinetic energy of the output piston 6 causes the cutting section to move. A shearing force is applied to the cutting portion 53, whereby the cutting portion 53 is cut. Thereby, in the conductor piece 50 forming a part of the electric circuit to which the electric circuit interrupting device 100 is attached, conduction between the first connection portion 51 and the second connection portion 52 is interrupted. Since the cut piece of the cut portion 53 cut by the output piston 6 is accommodated in the insulating space 61 in the insulating portion 60, the above-described conduction interruption can be more reliably performed.

  As described above, in the electric circuit breaker 100 to which the actuator 1 according to the present invention is applied, the actuator 100 can be efficiently driven. Is extremely useful in In addition, as an application example of the actuator 1, a drilling machine or the like for making a hole in an object can be exemplified.

<Second embodiment>
FIG. 6 shows a second embodiment of the actuator 1 of the present invention. In the first embodiment, the drive energy from the initiator 20 is applied to the output piston 6 via the sealing member 8, and the sealing member 8 is directly exposed to the combustion gas. On the other hand, in the present embodiment, the drive energy is once transmitted to the auxiliary piston 60 and then indirectly acts on the output piston 6 via the sealing member 8, and the sealing member 8 directly contacts the combustion products. Exposure can be suppressed. In the present embodiment, the actuator main body 2 is formed by the first housing 3A and the second housing 4, and the same reference numerals are given to the substantially same components as those in the first embodiment. A detailed description thereof will be omitted.

A combustion chamber 31 is formed in the first housing 3 </ b> A, and the combustion chamber 31 is configured to diffuse a combustion product generated by the initiator 20. Here, a metal auxiliary piston 60 is further disposed in the combustion chamber 31 and is slidably held in the combustion chamber 31. The auxiliary piston 60 is arranged such that one end faces the initiator 20 and the other end sandwiches the contact portion 34 of the sealing member 8 with the first end 6a of the output piston 6. . Therefore, when the ignition charge 22 is burned by the operation of the initiator 20, the driving energy is input to the end of the auxiliary piston 60 facing the initiator 20, and then transmitted to the output piston 6 via the contact portion 34 of the sealing member 8. Will be done. Therefore, the combustion of the ignition charge 22 causes the output piston 6 to slide together with the auxiliary piston 60. Also at this time, the sealing member 8 undergoes the reverse deformation in the same manner as in the first embodiment. In particular, in the present embodiment, since the contact portion 34 is sandwiched between the output piston 6 and the auxiliary piston 60, the deformation of the sealing member 8 is restricted in a specific direction. Deformation is easily performed. Further, in the present embodiment, since the driving energy is once input to the auxiliary piston 60, it is possible to suppress the sealing member 8 from being directly exposed to the combustion products, and as a result, the sealing member 8 The applied thermal stress can be reduced, and the damage can be suppressed more reliably.

  Thus, the actuator 1 according to the present embodiment can also be suitably applied to an electric circuit breaker as shown in FIG.

<Example 1>
In the actuator 1 according to the first embodiment, a confirmation experiment was performed to confirm whether or not the sealing by the sealing member 8 was achieved at the time of explosive combustion in the initiator 20. As the material of the sealing member 8, NBR (nitrile rubber) is adopted as a rubber material, and damage to the sealing member 8 when the hardness of the rubber material and the temperature condition of the actuator 1 during operation are changed, respectively. It was confirmed visually.

  Specifically, the hardness of the rubber material is two types, 50 degrees and 70 degrees. The temperature conditions of the actuator 1 are three types: high temperature (50 degrees), normal temperature (20 degrees), and low temperature (0 degrees). Further, the pressure in the combustion chamber 31 at the time of explosive combustion is 30 MPa at a peak value, and the thickness of the sealing member 8 is 1 mm. Under each hardness and temperature condition, the initiator 20 burned explosives three times, and the number of times the sealing member 8 was found to be damaged was confirmed. As a result, no damage was found under all the conditions.

<Example 2>
In the actuator 1 according to the second embodiment, a confirmation experiment was performed to confirm whether sealing by the sealing member 8 was achieved at the time of explosive combustion in the initiator 20. As the material of the sealing member 8, chloroprene and NBR are each used as a rubber material, and breakage or the like in the sealing member 8 when each of the rubber materials changes the temperature condition of the actuator 1 during operation is visually observed. Confirmed by

  Specifically, when chloroprene is used as the rubber material, its hardness is 65 degrees, and when NBR is used, its hardness is 70 degrees. The temperature conditions of the actuator 1 are three types: high temperature (50 degrees), normal temperature (20 degrees), and low temperature (0 degrees). Further, the pressure in the combustion chamber 31 at the time of explosive combustion is 30 MPa at a peak value, and the thickness of the sealing member 8 is 1 mm. Under each rubber material and temperature condition, the explosive combustion of the initiator 20 was performed three times, and the number of times that the sealing member 8 was damaged was confirmed. As a result, no damage was observed under all conditions.

  From the above, it can be understood that in any of the embodiments, NBR can be suitably adopted as the rubber material forming the sealing member 8. In the second embodiment, chloroprene can be further used as the rubber material. Note that the results of the above example are merely examples, and in the first embodiment, chloroprene is used as the rubber material in the first embodiment by adjusting the hardness of the rubber material or limiting the temperature conditions of the actuator 1. It is considered possible to adopt it.

1 Actuator 2 Actuator body 6 Output piston 8 Sealing member 20 Initiator 22 Ignition charge 31 Combustion chamber 34 ··· Contact part 35 ··· Fixed end 36 ··· Middle part 37 ··· Through hole 60 ··· Auxiliary piston

Claims (5)

An actuator body having a through hole formed in the axial direction, and an output piston portion slidably disposed in the through hole, comprising: an output piston portion protruding from an output surface of the actuator body. An actuator that applies a predetermined force to an object,
An ignition device for burning an explosive, the ignition device for applying drive energy for sliding the output piston portion to the output piston portion by explosive combustion in the ignition device,
The space in the actuator body is divided into a first space in which the ignition device is arranged and a second space in which the output piston portion is arranged, and the combustion products generated by the ignition device are divided into the first space. A sealing member for sealing in the space,
Further comprising
The output piston section has a working end acting on the object, and a predetermined end having a predetermined end face that receives the driving energy,
The sealing member,
A fixed end fixed to an inner wall defining a space in the actuator body,
A contact portion that contacts the predetermined end surface of the predetermined end portion during explosive combustion in the ignition device;
Has,
In a state before explosive combustion in the ignition device, the contact portion is located at a start position on the ignition device side with respect to the fixed end,
By the explosive combustion in the ignition device, the contact portion is configured to come into contact with the predetermined end surface and to move to the operation position on the output surface side with respect to the fixed end portion with sliding of the output piston portion. ,
Actuator. The sealing member is formed of an elastic member,
The actuator according to claim 1. The sealing member covers a side surface of the predetermined end along the sliding direction of the output piston in a state before explosive combustion in the ignition device, and is provided between the fixed end and the contact portion. Further comprising an intermediate portion formed,
With the sliding of the output piston portion due to the explosive combustion in the ignition device, the contact portion moves from the starting position to the operating position while the intermediate portion extends in the sliding direction.
The actuator according to claim 2. The outer diameter of the output piston portion at the predetermined end is smaller than the inner diameter of the through hole,
Along with sliding of the output piston portion due to explosive combustion in the ignition device, the intermediate portion extends in the sliding direction along an inner wall surface of the through hole.
The actuator according to claim 3. An auxiliary piston portion further slidably disposed in the through hole and disposed on the first space side, wherein the auxiliary piston portion is disposed so as to sandwich the contact portion of the sealing member together with the predetermined end surface of the output piston portion. Further equipped with an auxiliary piston part,
The auxiliary piston portion is an ignition device side end portion facing the ignition device and to which the driving energy is input, and an output piston portion side for transmitting the driving energy to the predetermined end surface of the output piston portion via the contact portion. Having an end,
The actuator according to any one of claims 1 to 4.

Images