Cutout gear

Abstract

To provide a cutout gear capable of preventing a pusher from being damaged when an igniter generates a gas.SOLUTION: A cutout gear 1 includes: an enclosure (for example, upper enclosure 20 and lower enclosure 30); a pusher 60 located inside the enclosure; an igniter 10 holding gunpowder inside, which has a cover 11 placed between the gunpowder and the pusher 60, and which is placed above the pusher 60 and generates a gas; a protection part 80 that is fixed to the enclosure or the igniter 10 enclosing the igniter 10; and a conductor 50 that has a separation part 51 located below the pusher 60. When a pressure is applied to the gas generated by igniter 10, the pusher 60 moves the separation part 51 downward. Viewed from above, the bottom end of a protection part 80 is located inside the outer surface of pusher 60. The lid 11 has an opening 11a configured to open under gas pressure. The lower end of the protection part 80 is located lower than the lower end of the lid part 11.SELECTED DRAWING: Figure 3A

Description

[Technical Field]

[0001] The present disclosure relates to an isolating device. [Background technology]

[0002] Conventionally, there has been known a circuit breaking device that is connected to an electric circuit. One such circuit breaking device is disclosed in Patent Document 1, which includes a piston (pusher) having a recess, an igniter disposed in the recess, and a bus bar (conductor), and the piston moves from a raised position to a lowered position to cut off the bus bar. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2017-533570 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the piston disclosed in Patent Document 1 has a thin recessed portion, which is thought to reduce its strength, and therefore there is a risk that the pusher may be damaged when, for example, the igniter generates gas.

[0005] Therefore, the present disclosure provides a cutoff device that can prevent the pusher from being damaged when the igniter generates gas. [Means for solving the problem]

[0006] An interrupter according to one aspect of the present disclosure comprises a housing, a pusher located inside the housing, an igniter that holds gunpowder inside and has a lid portion provided between the gunpowder and the pusher, is located above the pusher and generates gas, a protective portion fixed to the housing or the igniter so as to surround the igniter, and a conductor having a separation portion located below the pusher, wherein when the pusher receives pressure from the gas generated by the igniter, it moves the separation portion downward, and when viewed from above, the lower end of the protective portion is located inside the outer surface of the pusher, the lid portion has an opening configured to open when subjected to pressure from the gas, and the lower end of the protective portion is located below the lower end of the lid portion.

[0007] A shutoff device according to one aspect of the present disclosure comprises a housing, a pusher located inside the housing, an igniter disposed above the pusher and generating gas, a protective portion arranged to cover the surface of the pusher facing the igniter, and a conductor having a separation portion located below the pusher, wherein when the pusher receives pressure from the gas generated by the igniter, the separation portion moves downward, and when viewed from above, the lower end of the protective portion is located inside the outer surface of the pusher.

[0008] An interrupter according to one aspect of the present disclosure includes a housing, a pusher having a protective portion including a metal layer and an insulating layer and positioned inside the housing, an igniter positioned above the pusher to generate gas, and a conductor having a separation portion positioned below the pusher, wherein when the pusher receives pressure from the gas generated by the igniter, the separation portion moves downward, and the insulating layer is positioned between the metal layer and the igniter. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, it is possible to realize a cutoff device that can suppress damage to a pusher when an igniter generates gas. [Brief explanation of the drawings]

[0010] [Figure 1A] FIG. 1A is a first perspective view showing the blocking device according to the first embodiment. [Figure 1B] FIG. 1B is a second perspective view showing the blocking device according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional perspective view showing the blocking device according to the first embodiment. [Figure 3A] FIG. 3A is a cross-sectional view showing the blocking device according to the first embodiment. [Figure 3B] FIG. 3B is a perspective view showing a part of the igniter according to the first embodiment before gas is generated. [Figure 3C] FIG. 3C is a plan view of the lid portion and the protective portion of the igniter according to the first embodiment, seen from below, before gas is generated. [Figure 4A] FIG. 4A is a cross-sectional view for explaining the interrupting operation of the interrupting device according to the first embodiment. [Figure 4B] FIG. 4B is a perspective view showing a part of the igniter according to the first embodiment after gas is generated. [Figure 5A] FIG. 5A is a cross-sectional view showing a blocking device according to a first modification of the first embodiment. [Figure 5B] FIG. 5B is a cross-sectional view showing a blocking device according to a second modification of the first embodiment. [Figure 5C] FIG. 5C is a cross-sectional view showing a blocking device according to a third modification of the first embodiment. [Figure 5D] FIG. 5D is a cross-sectional view showing a blocking device according to a fourth modification of the first embodiment. [Figure 6] FIG. 6 is a flowchart showing the manufacturing process of the circuit breaking device according to the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing a breaking device according to the second embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing a blocking device according to another embodiment. [Figure 9] FIG. 9 is a cross-sectional view illustrating a state in which a separating portion of a blocking device according to another embodiment has moved downward. DETAILED DESCRIPTION OF THE INVENTION

[0011] An interrupter according to one aspect of the present disclosure comprises a housing, a pusher located inside the housing and having a recess, an igniter that holds gunpowder inside and has a lid portion located between the gunpowder and the pusher, is located in the recess and generates gas, a protective portion that is provided on the housing or the igniter and located inside the recess, and a conductor that has a separation portion located below the pusher, wherein the pusher moves the separation portion downward when subjected to the pressure of the gas generated by the igniter, the lid portion has an opening configured to open when subjected to the pressure of the gas, and the lower end of the protective portion is located below the lower end of the lid portion.

[0012] As a result, the lower end of the protective part is positioned lower than the lower end of the lid part, so when the opening opens downward due to the pressure of gas generated by the igniter, the opened opening comes into contact with the protective part and is prevented from opening wide. In other words, the protective part acts as a barrier to prevent the opening from opening wide and can prevent the opened opening from coming into contact with the recessed part of the pusher. Therefore, the cutoff device can prevent the pusher from being damaged by the opening coming into contact when the igniter generates gas.

[0013] Furthermore, for example, it is preferable that the protection portion has a first cylindrical portion connected to the housing, and a second cylindrical portion located below the first cylindrical portion and having a smaller diameter than the first cylindrical portion.

[0014] As a result, the second cylindrical portion of the protector is positioned more inward than the first cylindrical portion, so the thickness of the recessed portion of the pusher corresponding to the second cylindrical portion can be made thicker than when the first cylindrical portion and the second cylindrical portion have the same diameter. In other words, the strength of the pusher can be improved. Therefore, the blocking device can further prevent damage to the pusher.

[0015] Also, for example, it is preferable that the recess of the pusher has a first portion having a larger diameter than the first cylindrical portion, and a second portion located below the first portion and having a larger diameter than the second cylindrical portion, and that the diameter of the first portion is larger than the diameter of the second portion.

[0016] This allows the thickness of the second portion of the recess to be increased, thereby improving the strength of the pusher compared to when the thickness of the second portion is the same as that of the first portion, and therefore the blocking device can further prevent the pusher from being damaged.

[0017] Also, for example, it is preferable that the distance from the lower end of the lid portion to the lower end of the second cylindrical portion is equal to or longer than half the length of the notch provided in the opening of the lid portion.

[0018] This allows the second cylindrical portion to be positioned below half the length of the surface of the lid portion, more reliably preventing the opening from coming into contact with the pusher, and therefore the blocking device can more reliably prevent the pusher from being damaged.

[0019] Also, for example, it is preferable that the diameter of the opening below the protection portion be smaller than the diameter of the lid portion.

[0020] This allows the pressure of the gas generated by the igniter to be concentrated, thereby reducing the amount of gunpowder required.

[0021] Also, for example, it is preferable that the housing is made of metal, the protective part has a metal member connected to the housing and a resin member arranged inside the metal member, the metal member includes the first cylindrical part and the second cylindrical part, and the vertical length from the upper end of the resin member to the lower end of the resin member is greater than the vertical length from the lower end of the cover part to the lower end of the second cylindrical part.

[0022] As a result, when the igniter generates gas, the opening comes into contact with the resin member, and therefore even if the opening is made of metal, electrical continuity between the opening and the housing via the metal member can be suppressed. In other words, the resin member can suppress electrical continuity of the arc generated at the time of interruption to the igniter via the housing.

[0023] Also, for example, it is preferable that the resin member has a first portion arranged inside the metal member, a second portion arranged outside the metal member, and a third portion connecting the first portion and the second portion, and that the third portion is located below the metal member.

[0024] This allows the third portion to be located below the metal member, which more reliably prevents the opening from coming into contact with the metal member after the igniter generates gas.

[0025] Also, for example, the protective part may have a resin part and a metal part, the resin part and the metal part being integrally formed, and the resin part may cover the inner surface of the metal part below the lid part.

[0026] This makes it possible to omit manufacturing steps such as attaching the resin part to the metal part, which can be easier to manufacture than when the resin part and the metal part are separate.

[0027] Also, for example, it is preferable that the distance from the lower end of the lid portion to the lower end of the resin portion be equal to or greater than half the length of the notch provided in the opening of the lid portion.

[0028] This allows the resin portion to be positioned more than half the length below the surface of the lid portion, more reliably preventing electrical conduction between the opening and the housing via the metal portion after the igniter generates gas.

[0029] Also, for example, it is preferable that the resin part has a first part arranged inside the metal part, a second part arranged outside the metal part, and a third part connecting the first part and the second part, and that the third part is located below the metal part.

[0030] This allows the third portion to be located below the metal portion, making it possible to more reliably prevent the opening from coming into contact with the metal portion after the igniter generates gas.

[0031] In addition, an interrupter according to one aspect of the present disclosure includes a housing, a pusher located inside the housing and having a recess, an igniter that holds gunpowder inside and has a lid portion provided between the gunpowder and the pusher, is located in the recess and generates gas, a protective portion provided to cover the inner surface of the recess, and a conductor that has a separation portion located below the pusher, and the pusher moves the separation portion downward under the pressure of the gas generated by the igniter.

[0032] As a result, since the recess of the pusher is covered by the protective part, when the opening opens downward due to the pressure of the gas generated by the igniter, the opened opening comes into contact with the protective part, and the protective part prevents the opening from coming into contact with the recess of the pusher. Therefore, the cutoff device can prevent damage to the pusher due to contact with the opening when the igniter generates gas.

[0033] Also, for example, it is preferable that the protection portion covers a portion of the inner surface of the recess below the lid portion.

[0034] This allows the protective portion to cover the portion of the pusher that may come into contact with the opening, thereby effectively preventing damage to the pusher.

[0035] Also, for example, the protective portion is a metal layer covering the inner surface of the recess, or an insulating layer covering the inner surface of the recess and made of a material different from that of the pusher, and it is preferable that the protective portion be located between the lid portion and the pusher.

[0036] This makes it possible to prevent damage to the pusher by the metal layer or insulating layer formed integrally with the pusher. Furthermore, for example, if the protective part is a metal layer, damage to the pusher can be more reliably prevented, and if the protective part is an insulating layer, electrical conduction between the opening and the housing via the protective part can be further prevented.

[0037] Furthermore, for example, it is preferable that the protection portion is a metal member or an insulating member provided inside the recess, and that the metal member or the insulating member is positioned between the lid portion and the pusher.

[0038] This makes it possible to prevent damage to the pusher by using a metal or insulating member that is separate from the pusher. Furthermore, for example, if the protective part is a metal member, damage to the pusher can be more reliably prevented, and if the protective part is an insulating member, electrical conduction between the opening and the housing via the protective part can be further prevented.

[0039] Also, for example, it is preferable that the protection portion entirely covers the inner surface of the recess portion located below the lid portion.

[0040] This allows the protective portion to cover all (including substantially all) of the portions of the pusher that may come into contact with the opening, making it possible to more effectively prevent damage to the pusher.

[0041] Furthermore, for example, the protective portion may be configured to come into contact with the lid portion when the gas is generated.

[0042] This allows the protection section to prevent the lid section from coming into contact with the pusher, thereby preventing damage to the pusher.

[0043] When the pusher receives pressure from the gas generated by the igniter, the pusher may separate the separation portion from the conductor and move the separation portion downward.

[0044] Hereinafter, each embodiment will be specifically described with reference to the drawings.

[0045] Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, components, component placement and connection configurations, steps (processes), and order of steps (processes) shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Furthermore, among the components in the following embodiments, components not described in independent claims are described as optional components.

[0046] Furthermore, each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales of the figures do not necessarily match. Furthermore, in each figure, substantially the same components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0047] In this specification and the drawings, the X-axis, Y-axis, and Z-axis represent the three axes of a right-handed three-dimensional Cartesian coordinate system. In each embodiment, the Z-axis direction is the direction of movement of the pusher. In this specification, "plan view" means viewing the blocking device from the Z-axis direction, and "side" means a direction perpendicular to the Z-axis direction. In this specification, the Z-axis direction is also referred to as the up-down direction. However, for the convenience of explaining each embodiment, the up-down direction of the blocking device in this specification merely indicates the relative positional relationship of each element in the blocking device. For example, in this specification, the terms "up" and "down" do not refer to the up (vertically upward) and down (vertically downward) directions in absolute spatial recognition, but are used as terms defined by the relative positional relationship based on the direction of movement of the pusher. In addition, the orientation of the blocking device when installed is not limited to the direction shown in the drawings.

[0048] Furthermore, in this specification, terms indicating the relationship between elements, such as equal and parallel, terms indicating the shape of elements, such as circle and trapezoid, as well as numerical values and numerical ranges, are not expressions that only express the strict meaning, but are expressions that also mean a substantially equivalent range, for example, including a difference of about several percent (or about 10%).

[0049] Furthermore, in this specification, ordinal numbers such as "first" and "second" do not refer to the number or order of components unless otherwise specified, but are used for the purpose of avoiding confusion and distinguishing between components of the same type.

[0050] (Embodiment 1) Hereinafter, the breaking device according to the present embodiment will be described with reference to FIGS. 1A to 4B.

[0051] [1-1. Configuration of the circuit breaker] First, the configuration of the interrupting device according to the present embodiment will be described with reference to Figs. 1A to 3C. Fig. 1A is a first oblique view showing the interrupting device 1 according to the present embodiment. Fig. 1B is a second perspective view showing the interrupting device 1 according to the present embodiment. Fig. 2 is a cross-sectional perspective view showing the interrupting device 1 according to the present embodiment. Fig. 3A is a cross-sectional view showing the interrupting device 1 according to the present embodiment.

[0052] Fig. 1A is a view of the interrupter 1 rotated about the Z axis from the front view, where a view from the X axis direction is considered a front view, and Fig. 1B is a view of the interrupter 1 viewed from diagonally below. Fig. 2 is a perspective view showing a cross section of the interrupter 1 when not performing an interrupting operation (initial state) taken along the YZ plane, and Fig. 3A is a front view showing a cross section of the interrupter 1 when not performing an interrupting operation (initial state) taken along the YZ plane.

[0053] As shown in FIGS. 1A to 3A, the circuit breaker 1 includes an igniter 10, an upper housing 20, a lower housing 30, a resin member 40, a conductor 50, a pusher 60, a protective portion 80, and elastic members 90, 92, 94, and 96. The circuit breaker 1 is mounted on an object having an electric circuit, and is activated in the event of an abnormality in the electric circuit, system, or the like within the object, thereby interrupting the electric circuit and preventing further damage from the abnormality. The circuit breaker 1 is mounted, for example, on a vehicle, which is an example of the object, and is connected between a motor and a battery (e.g., a lithium-ion battery) for driving the motor, and interrupts the electrical connection between the motor and the battery for driving the motor in the event of an emergency such as an abnormality or accident. Note that the object may be other than a vehicle, and examples thereof include, but are not limited to, home appliances and solar power generation systems.

[0054] Igniter 10 holds explosives therein, has a lid 11 provided between the explosives and a pusher 60, is placed in recess 61, and generates gas. For example, igniter 10 is an electric igniter having an explosive part having an explosive and a conductive pin for conducting electricity to the explosive part. When activated, an operating current for igniting the explosive is supplied to the conductive pin from an external power source, thereby igniting and burning the explosive, generating gas (combustion gas). Note that the formation of recess 61 allows for the miniaturization of circuit breaker 1.

[0055] The igniter 10 is fixed to the upper small diameter portion 21 of the upper housing 20.

[0056] Here, the lid portion 11 will be further described with reference to Figures 3B and 3C. Figure 3B is a perspective view showing a part of the igniter 10 according to this embodiment before gas is generated. Figure 3C is a plan view of the lid portion 11 and protective portion 80 of the igniter 10 according to this embodiment, viewed from below, before gas is generated. Figure 3C is a schematic diagram showing the lid portion 11 (opening 11a and outer frame portion 11b) and the second cylindrical portion 82 when viewed in a direction from the negative side of the Z axis toward the positive side of the Z axis. "Before gas is generated" means "before the shut-off operation."

[0057] 3B and 3C, the lid portion 11 has an opening 11a and an outer frame portion 11b. In Fig. 3C, the notch 11a1 is schematically indicated by a dashed line. The lid portion 11 may be made of, but is not limited to, metal.

[0058] The opening 11a is arranged so as to be openable toward the negative Z-axis side, and opens downward under gas pressure. The opening 11a is, for example, flat, but may also be curved. In addition, a notch 11a1 (groove) is formed in the opening 11a to make it easier to open.

[0059] Although notches 11a1 are not in contact with outer frame portion 11b in FIGS. 3B and 3C, notches 11a1 may be in contact with outer frame portion 11b.

[0060] The outer frame portion 11b is a cylindrical member that surrounds the opening portion 11a in a plan view.

[0061] The lid 11 may be covered with resin, etc. In other words, the lid 11 and the protective part 80 may be electrically insulated from each other in the initial state.

[0062] 3C is half the length of the notch 11a1 of the opening 11a. Note that the length L2 may be the same as half the diameter of the opening 11a.

[0063] The planar shape of the opening 11a is not limited to a circular shape, but may be an elliptical shape, a rectangular shape, or the like.

[0064] 1A to 2, the upper housing 20 and the lower housing 30 are members that form the outer shell of the circuit breaker 1, and house the igniter 10, the resin member 40, part of the conductor 50, the pusher 60, and the protective part 80. A space 70 extending in the vertical direction is formed inside the upper housing 20 and the lower housing 30. The space 70 is a cylindrical space that allows the pusher 60 to move. The pusher 60 is housed at the upper end side (positive side of the Z axis) of the space 70 in the vertical direction (Z axis direction).

[0065] The upper housing 20 and the lower housing 30 are each made of a metal such as stainless steel (SUS), but may also be made of other metals such as aluminum. The upper housing 20 and the lower housing 30 have a cylindrical outer shape, but the shape is not limited to this. The upper housing 20 and the lower housing 30 are fixed together using fastening members such as screws and rivets. The upper housing 20 and the lower housing 30 are an example of a housing.

[0066] The upper housing 20 is, for example, a cylindrical member having a stepped cylindrical shape, and is hollow inside. The upper housing 20 has a small diameter portion 21 located at the top, a large diameter portion 23 located at the bottom, and a connecting portion 22 connecting the small diameter portion 21 and the large diameter portion 23. The small diameter portion 21 and the large diameter portion 23 are arranged coaxially, and the large diameter portion 23 has a larger diameter than the small diameter portion 21.

[0067] The lower housing 30 is a hollow cylindrical member with a bottom, and has a protrusion 30a that protrudes upward. Specifically, the lower housing 30 has the protrusion 30a, a bottom 33, and a sidewall 34. The protrusion 30a, the bottom 33, and the sidewall 34 are integrally formed.

[0068] In this specification, integral formation means that each component is formed from the same material, formed simultaneously, or is the same (single) object.

[0069] Protrusion 30a is located below separation portion 51 and is configured to protrude upward in space 70. Protrusion 30a is connected to one end of bottom portion 33 and protrudes upward (toward the positive Z-axis) from bottom portion 33 in space 70. Protrusion 30a comes into contact with pusher 60, which has moved downward due to gas generated by igniter 10, via conductor 50, and is configured to be pressed by pusher 60 and deformed downward. In other words, protrusion 30a has the function of absorbing impact (stress) from pusher 60 by deforming.

[0070] Furthermore, when the interrupter 1 is viewed from the negative side of the Z axis toward the positive side of the Z axis, the protrusion 30a forming the recess of the lower housing 30 is exposed when viewed from the outside of the interrupter 1. In this embodiment, the protrusion 30a has a shape that tapers upward in the space 70, but the shape is not limited to this.

[0071] The bottom 33 connects the protrusion 30a and the side wall 34. In other words, the protrusion 30a and the side wall 34 are connected via the bottom 33. The outer surface and the inner surface of the bottom 33 are each inclined upward from the protrusion 30a toward the side wall 34.

[0072] The side wall portion 34 is connected to the other end of the bottom portion 33 and is formed to extend upward from the bottom portion 33. The side wall portion 34 has a tubular shape, and in this embodiment has a cylindrical shape. The side wall portion 34 is arranged coaxially with the small diameter portion 21 and the large diameter portion 23. The side wall portion 34 has, for example, the same diameter as the large diameter portion 23.

[0073] In this embodiment, the thicknesses of the protrusion 30a, the bottom 33, and the sidewall 34 are the same, but may be different from one another, for example.

[0074] The resin member 40 is a member that covers a part of the conductor 50. The resin member 40 is also a part of the components that form the space 70. The resin member 40 has an embedded portion 41, a first cylindrical portion 42, and a second cylindrical portion 43.

[0075] The embedded portion 41 is a portion of the resin member 40 in which the conductor 50 is embedded. For example, a portion of the embedded portion 41 is exposed from the housing. A through-hole is formed in the embedded portion 41 in which the conductor 50 (specifically, the holding portion 52) is disposed.

[0076] The first cylindrical portion 42 is a portion of the resin member 40 that is disposed inside the housing, and the pusher 60 is disposed inside the first cylindrical portion 42 when no cutoff operation is performed (when no gas is generated by the igniter 10). The first cylindrical portion 42 has a smaller inner diameter than the second cylindrical portion 43. The position of the pusher 60 shown in Figures 2 and 3A indicates the initial position when no cutoff operation is performed.

[0077] The second cylindrical portion 43 is a portion of the resin member 40 that is disposed inside the housing, and is located below the first cylindrical portion 42. The second cylindrical portion 43 has a larger inner diameter than the first cylindrical portion 42. This allows the volume of the lower side of the space 70 to be increased. Therefore, an increase in pressure inside the housing due to the gas generated by the igniter 10 and the resulting movement of the pusher 60 can be suppressed, and deformation of the cutoff device 1 can be suppressed.

[0078] In this way, the pusher 60 moves within the space 70 formed by the first cylindrical portion 42 and the second cylindrical portion 43. The first cylindrical portion 42 and the second cylindrical portion 43 are not limited to having different inner diameters, and may have the same inner diameter.

[0079] The conductor 50 is a conductive metal body, a portion of which is located inside the upper housing 20 and the lower housing 30. The conductor 50 also forms part of a predetermined electric circuit when the circuit breaker 1 is attached to the electric circuit, and is also called a bus bar. The conductor 50 is a flat plate-like member that is held by the resin member 40 and is arranged so as to traverse the inside of the upper housing 20 and the lower housing 30. The conductor 50 has a separation portion 51 and a holding portion 52.

[0080] The conductor 50 may be made of a metal such as copper (Cu). However, the conductor 50 may be made of a metal other than copper, or may be made of an alloy of copper and another metal. For example, the conductor 50 may be made of manganese (Mn), nickel (Ni), platinum (Pt), etc.

[0081] The separation portion 51 is a portion of the conductor 50 that is separated by the pusher 60 when it receives the pressure of the gas generated by the igniter 10, and is located below the pusher 60 in the initial position.

[0082] The holding portion 52 is a portion of the conductor 50 that is held by the resin member 40. The holding portion 52 is a portion that does not overlap with the pusher 60 in a plan view, such as a portion that overlaps with the resin member 40 in a plan view and a portion that is located outside the housing. The holding portion 52 remains held by the resin member 40 even after the separation portion 51 is separated.

[0083] The pusher 60 is located below the igniter 10 and is arranged to be movable downward, and when a system abnormality occurs, the pusher 60 moves downward to cut the conductor 50 and emergency shut off the continuity in the electrical circuit. In this way, the pusher 60 is configured to separate the separating portion 51 from the conductor 50 when it receives the pressure of the gas generated by the igniter 10.

[0084] Pusher 60 is formed of an insulating material such as synthetic resin. In this embodiment, pusher 60 is formed of nylon. Pusher 60 has a cylindrical shape and an outer diameter corresponding to the inner diameter of small diameter portion 21 of upper housing 20. Pusher 60 also has a recess 61, inside which igniter 10 is disposed. Note that the shape of pusher 60 is not limited to the above and can be changed as appropriate depending on the shapes of upper housing 20 and lower housing 30, etc. Recess 61 is the upper portion of pusher 60, and is the portion where a downwardly oriented recess is provided.

[0085] In the example of FIG. 2, the recess 61 is a portion whose lateral surface is surrounded by the small diameter portion 21 and the connection portion 22 when the circuit breaking device 1 is not performing a circuit breaking operation (the state shown in FIG. 2).

[0086] In a plan view, the recess 61 has a first portion 62 having a larger diameter (e.g., inner diameter) than the first cylindrical portion 81 of the protective portion 80, and a second portion 63 located below the first portion 62 and having a larger diameter (e.g., inner diameter) than the second cylindrical portion 82. In a plan view, the diameter of the first portion 62 is larger than the diameter of the second portion 63. For example, in a cross-sectional view, the inner wall of the first portion 62 has a tapered shape in which the diameter decreases toward the second portion 63, but it may also have a stepped shape in which the diameter decreases in stages.

[0087] Protective portion 80 is a component that prevents pusher 60 from being damaged by opening 11a of igniter 10 when igniter 10 generates gas. Specifically, protective portion 80 acts as a barrier to prevent opening 11a from opening too wide, and is a member that prevents opening 11a, which opens when igniter 10 generates gas, from coming into contact with pusher 60 and damaging recess 61 of pusher 60.

[0088] Protective portion 80 is provided on a housing (e.g., upper housing 20) or igniter 10, and has a portion located inside recess 61. In the present embodiment, protective portion 80 is provided on the housing (specifically, small diameter portion 21). Protective portion 80 is fixed to small diameter portion 21 by, for example, welding, but the fixing method is not limited to this.

[0089] 3A and other figures, the protection portion 80 has a first cylindrical portion 81 and a second cylindrical portion 82. The first cylindrical portion 81 and the second cylindrical portion 82 are integrally formed.

[0090] The first cylindrical portion 81 is a cylindrical portion that surrounds the side of the igniter 10, and has a shape that follows the igniter 10. In the present embodiment, the first cylindrical portion 81 is formed in a stepped shape (for example, a two-step stepped shape) in which the diameter (for example, the inner diameter) gradually decreases toward the bottom in a cross-sectional view. Note that the shape of the first cylindrical portion 81 is not limited to this, and for example, the first cylindrical portion 81 may be tapered so that the diameter decreases toward the bottom, or may have another shape.

[0091] The first cylindrical portion 81 may be in at least partial contact with the igniter 10. Below the first cylindrical portion 81, the second cylindrical portion 82 is disposed.

[0092] The first cylindrical portion 81 also has a flange portion 83 on its upper side. The flange portion 83 is an annular portion (e.g., a plate-shaped member) formed so as to protrude outward in a plan view from the upper end of the first cylindrical portion 81, and is fixed to the small diameter portion 21 by welding or the like. For example, at least a portion of the flange portion 83 is disposed between the first part 62 and the small diameter portion 21. In this way, the first cylindrical portion 81 has a portion that connects to the housing and is fixed to the housing.

[0093] The second cylindrical portion 82 is located below the first cylindrical portion 81 and is an annular portion having a smaller diameter (e.g., inner diameter) than the first cylindrical portion 81. The second cylindrical portion 82 protrudes linearly from the lower end of the first cylindrical portion 81 toward the negative Z-axis side and is the portion that comes into contact with the lid portion 11 when gas is generated. The lower end (the end on the negative Z-axis side, e.g., the lowest end) of the second cylindrical portion 82 is located below (on the negative Z-axis side) the lower end (the end on the negative Z-axis side, e.g., the lowest end) of the lid portion 11 (see FIG. 3A) when no gas is generated. For example, as shown in FIG. 3A, the length L1 of the second cylindrical portion 82 from the lower end of the lid portion 11 to the lower end of the second cylindrical portion 82 is equal to or longer than the length L2 of the notch 11a1 of the lid portion 11. The second cylindrical portion 82 does not come into contact with the pusher 60.

[0094] The protective portion 80 is formed of a metal such as stainless steel (SUS), but may be formed of other metals such as aluminum, or may be formed of a resin (for example, a resin different from that of the pusher 60).

[0095] As shown in FIG. 2 and other figures, the elastic members 90, 92, 94, and 96 are elastic members such as rubber, and are O-rings formed in an annular shape.

[0096] Elastic member 90 is disposed in a space formed between fixing member 100 for fixing igniter 10 disposed in recess 61, igniter 10, and small diameter portion 21. Elastic member 90 is in contact with each of fixing member 100, igniter 10, and small diameter portion 21, and is pressed by, for example, each of fixing member 100, igniter 10, and small diameter portion 21.

[0097] The elastic member 92 is disposed in a space formed between the housing (e.g., connecting portion 22), the pusher 60, and the resin member 40 to prevent the internal space of the recess 61 and the conductor 50 from being spatially connected. The elastic member 92 prevents gas generated by the igniter 10 from reaching the conductor 50. In the present embodiment, the elastic member 92 is in contact with the housing, the pusher 60, and the resin member 40, and is pressed by, for example, each of the housing, the pusher 60, and the resin member 40.

[0098] The elastic member 94 is disposed above the conductor 50 in a space formed between a circumferential recess formed in the resin member 40 and a housing (for example, the large diameter portion 23) in order to prevent spatial connection between the space above the conductor 50 and the external space. In this embodiment, the elastic member 94 is in contact with both the resin member 40 and the large diameter portion 23, and is pressed by, for example, both the resin member 40 and the large diameter portion 23.

[0099] The elastic member 96 is disposed below the conductor 50 in a space formed between a circumferential recess formed in the resin member 40 and the lower housing 30 (for example, the side wall portion 34) in order to prevent spatial connection between the space below the conductor 50 and the external space. In this embodiment, the elastic member 96 is in contact with both the resin member 40 and the side wall portion 34, and is pressed by, for example, both the resin member 40 and the side wall portion 34.

[0100] The elastic members 94 and 96 are not limited to being arranged without gaps in the circumferential recess, and gaps may be formed in at least one of the vertical directions.

[0101] [1-2. Shutdown operation] Next, the interrupting operation of the interrupting device 1 configured as above will be described with reference to Figures 4A and 4B. Figure 4A is a cross-sectional view for explaining the interrupting operation of the interrupting device 1 according to this embodiment. Figure 4A shows the cross-sectional configuration of the interrupting device 1 after the interrupting operation. Figure 4B is a perspective view showing a part of the cover portion 11 of the igniter 10 according to this embodiment after gas generation.

[0102] For convenience, FIGS. 4A and 4B show the state in which the opening 11a is opened along the Z-axis direction and reaches its lowest position. Therefore, although FIG. 4A shows the opening 11a not in contact with the protective portion 80, in reality, the opening 11a opens so as to come into contact with the second cylindrical portion 82. Also, FIG. 4B shows an ideal opening state in which the opening 11a is cut along the notch 11a1 when gas is generated, but in an actual product, the opening 11a is not necessarily cut cleanly along the notch 11a1. The state in which the opening 11a opens can vary depending on, for example, the amount of explosives.

[0103] 4A, when igniter 10 is activated, pusher 60 receives energy from igniter 10 on its upper surface (pressure-receiving surface), causing pusher 60 to move downward at high speed from the initial position shown in FIG. 3A, detaching separation portion 51 from holding portion 52, and then moving further downward at high speed together with detached separation portion 51, until separation portion 51 comes into contact with protrusion 30a. This allows pusher 60 to forcibly and physically cut conductor 50.

[0104] Furthermore, the protrusions 30a are pushed by the pusher 60 and deform downward. As a result, the deformation of the protrusions 30a can absorb the impact (stress) from the pusher 60. Furthermore, even if the pusher 60 moves further downward, a part of the pusher 60 (for example, at least a part of the recesses 61) is positioned above the cut surfaces 53. This can increase the insulation distance between the cut surfaces 53 of the conductors 50, thereby suppressing the occurrence of an arc when the conductors 50 are interrupted.

[0105] 4A and 3C is the distance from the bottom end of the lid portion 11 to the bottom end of the protective portion 80. Furthermore, as described above, the length L2 is half the length of the notch 11a1 of the opening 11a. The length L2 is equal to or less than the length L1. Due to this length relationship, when the opening 11a opens downward, the protective portion 80 acts as a barrier to prevent the opening 11a from opening too wide, and prevents the opened opening 11a from coming into contact with the recess 61 of the pusher 60.

[0106] As shown in FIG. 4A, the protection unit 80 is stationary during the cutoff operation and does not move together with the pusher 60.

[0107] (Various Modifications of the First Embodiment) Below, each of the modified examples applicable to the first embodiment will be described with reference to Figures 5A to 5D. Note that the following description will focus on the differences from the first embodiment, and descriptions of the same or similar aspects as the first embodiment will be omitted or simplified.

[0108] 5A to 5D are cross-sectional views showing interrupting devices according to respective variations of embodiment 1. The interrupting devices shown in Figs. 5A to 5D differ from interrupting device 1 according to embodiment 1 in the shape of the protection portion and the like.

[0109] As shown in FIG. 5A, the protection section 80a of the circuit breaker 1a has a first cylindrical section 81a and a second cylindrical section 82a.

[0110] The first cylindrical portion 81a is a cylindrical portion that surrounds the side of the igniter 10, and at least a portion of the first cylindrical portion 81a has a shape that conforms to the igniter 10. In the present embodiment, the first cylindrical portion 81a is formed in a stepped shape (one-step stepped shape) in which the diameter (for example, the inner diameter) gradually decreases downward in a cross-sectional view.

[0111] The second cylindrical portion 82a is located lower than the first cylindrical portion 81a and is a cylindrical portion with a smaller diameter (e.g., inner diameter) than the first cylindrical portion 81a. The second cylindrical portion 82a protrudes linearly from the lower end of the first cylindrical portion 81a toward the negative Z-axis side, and the length of the second cylindrical portion 82a in the Z-axis direction is longer, for example, than the length of the first cylindrical portion 81a in the Z-axis direction. Furthermore, the lower end (the end on the negative Z-axis side, for example, the lowest end) of the second cylindrical portion 82a is located lower (on the negative Z-axis side) than the lower end (the end on the negative Z-axis side, for example, the lowest end) of the lid portion 11 (see FIG. 3A) when no gas is generated.

[0112] The protective portion 80a configured in this manner is easy to manufacture because the number of stepped steps in the first cylindrical portion 81a is less than the number of steps in the igniter 10 and the linear portion is long.

[0113] The recess 61 a has a first portion 62 and a second portion 64 .

[0114] The first portion 62 is a portion whose diameter (for example, inner diameter) decreases downward at a predetermined curvature.

[0115] The second portion 64 is located below the first portion 62, and has an inner surface parallel to the Z-axis direction in a cross-sectional view. The second portion 64 is provided so as to face at least a part of the second cylindrical portion 82a in a cross-sectional view.

[0116] The shape of the recess 61a may correspond to the shape of the protective portion 80a.

[0117] As shown in FIG. 5B, a protection section 80b of the circuit breaker 1b has a first cylindrical section 81 and a second cylindrical section 82b.

[0118] The second cylindrical portion 82b is located below the first cylindrical portion 81 and is a cylindrical portion with a smaller diameter (for example, inner diameter) than the first cylindrical portion 81. The second cylindrical portion 82b protrudes from the lower end of the first cylindrical portion 81 toward the negative side of the Z axis, and has an inclined portion 82b1 at its lower end that is inclined inward. It can also be said that the lower end of the second cylindrical portion 82b is bent inward. The shape, orientation, etc. of the inclined portion 82b1 are not particularly limited as long as it is provided so as to protrude inward and be inclined with respect to the Z axis direction in a cross-sectional view.

[0119] The diameter of the opening 11a at the bottom of the second cylindrical portion 82b (length L3) is smaller than, for example, the length (2×L2) of the notch 11a1 (see FIG. 3C). The length L3 is the shortest distance between the tips of the inclined portions 82b1. The diameter of the opening 11a corresponds to the diameter of the lid portion 11.

[0120] The second cylindrical portion 82b is a portion that comes into contact with the lid portion 11 when, for example, gas is generated. In addition, the lower end (the end on the negative Z-axis side, for example, the lowest end) of the second cylindrical portion 82b is located lower (on the negative Z-axis side) than the lower end (the end on the negative Z-axis side, for example, the lowest end) of the lid portion 11 when no gas is generated.

[0121] In this way, by providing the protective portion 80b with the inclined portion 82b1, the pressure of the gas generated by the igniter 10 can be concentrated further inward, thereby reducing the amount of explosives.

[0122] The recess 61b has a first portion 62 and a second portion 65.

[0123] The second portion 65 is located below the first portion 62 and has a shape (curved shape) that follows the second cylindrical portion 82b. For example, the second portion 65 has a shape that follows the inclined portion 82b1, and the thickness of the portion of the second portion 65 corresponding to the inclined portion 82b1 in the direction perpendicular to the Z axis can be made thicker than when the second cylindrical portion 82b is formed only with linear portions. This can increase the strength of the recess 61 of the pusher 60.

[0124] As shown in FIG. 5C, the protective section 80c of the circuit breaker 1c has a metal section 110 and a resin section 112. The protective section 80c has a double structure of the metal section 110 and the resin section 112. The configuration of the metal section 110 is the same as the configuration of the protective section 80 described above, and therefore a description thereof will be omitted. Note that the metal section 110 and the resin section 112 are integrally formed, for example. The resin section 112 may be formed, for example, by coating the inner surface of the metal section 110. The resin section 112 may be formed by painting the surface of the metal section 110. Note that "integrally formed" means that the two elements are integrally formed, and one is non-detachably attached to the other.

[0125] Note that the metal part 110 and the resin part 112 are not limited to being formed integrally, but may be separate bodies with one detachably attached to the other. When the metal part 110 and the resin part 112 are detachable (separate members), the metal part 110 is an example of a metal member, and the resin part 112 is an example of a resin member. The resin member may be, for example, a sheet-like member made of resin, and may be arranged so as to fit along the metal member. Note that being detachable means that the metal part 110 and the resin part 112 are connected in a manner that allows them to be attached and detached without destruction or plastic deformation.

[0126] Resin portion 112 covers the inner surface of metal portion 110 below lid portion 11. In this embodiment, resin portion 112 covers the entire inner surface of metal portion 110. The distance from the lower end of lid portion 11 to the lower end of resin portion 112 (here, length L1) is equal to or greater than half the size of opening 11a of lid portion 11. In the example of FIG. 5C , the distance from the lower end of lid portion 11 to the lower end of resin portion 112 and the distance from the lower end of lid portion 11 to the lower end of metal portion 110 are equal, for example, length L1. The vertical length from the upper end of resin portion 112 to the lower end of resin portion 112 is length L4.

[0127] As shown in FIG. 5D, a protection section 80d of a circuit breaker 1d includes a metal section 110 and a resin section 120. The metal section 110 and the resin section 120 are made of a metal material.

[0128] The resin part 120 covers the inner surface of the metal part 110 below the lid part 11. In this embodiment, the resin part 120 is fitted into and fixed to the metal part 110 so as to cover the lower end part (tip part) of the metal part 110. The inner surface of the resin part 120 contacts the outer surface of the metal part 110. The metal part 110 is an example of a metal member, and the resin part 120 is an example of a resin member.

[0129] The resin part 120 has a first part 121 arranged inside the metal part 110, a second part 122 arranged outside the metal part 110, and a third part 123 connecting the first part 121 and the second part 122. At least a part of the third part 123 is located below the metal part 110. In other words, the lower end of the metal part 110 is not exposed. The resin part 120 is a cap-shaped member, and its cross-sectional shape is, for example, U-shaped.

[0130] Furthermore, the vertical length from the upper end to the lower end of the first portion 121 may be greater than, for example, the vertical length from the lower end of the lid portion 11 to the lower end of the second tubular portion 82. Furthermore, the vertical length from the upper end to the lower end of the second portion 122 may be less than, for example, the vertical length from the lower end of the lid portion 11 to the lower end of the second tubular portion 82.

[0131] The resin part 120 may be formed by coating or the like so as to cover the lower end of the metal part 110 from the inside to the outside.

[0132] (Manufacturing method) Next, a method for manufacturing the interrupter device according to the first embodiment and its various modifications configured as described above will be described with reference to Fig. 6. Fig. 6 is a flowchart showing the manufacturing process of the interrupter device 1 according to the first embodiment. Fig. 6 shows the manufacturing process of the interrupter device 1 according to the first embodiment.

[0133] 6, the upper housing 20 is produced by molding or the like (S10), and the lower housing 30 is produced by molding or the like (S20). Note that step S10 may be performed after step S20.

[0134] In step S10, the protective portion 80 is further provided on the upper housing 20. For example, the protective portion 80 is fixed to the upper housing 20 by welding or the like. In step S20, the protrusion 30a is formed simultaneously with molding of the lower housing 30.

[0135] Next, the upper housing 20 and the lower housing 30 are fixed together (S30). For example, with the igniter 10, the resin member 40, the conductor 50, the pusher 60, and the protective part 80 housed inside, the upper housing 20 and the lower housing 30 are fixed together without any gaps using fastening members or the like. In this way, the above-mentioned circuit breaker 1 is produced.

[0136] (Embodiment 2) The shutoff device according to this embodiment will be described below with reference to Fig. 7. The following description will focus on differences from the first embodiment, and descriptions of the same or similar aspects as those in the first embodiment will be omitted or simplified.

[0137] 7 is a cross-sectional view showing the breaking device 2 according to the present embodiment. The breaking device 2 according to the present embodiment differs from the breaking device 1 according to the first embodiment in that the protection part 130 is provided on the pusher 60 side.

[0138] As shown in FIG. 7, the circuit breaker 2 according to this embodiment includes a protection section 130 instead of the protection section 80 of the circuit breaker 1 according to the first embodiment.

[0139] The protective part 130 is provided so as to cover the inner surface of the recessed part 61 of the pusher 60. The protective part 130 may be provided, for example, so as to come into contact with and cover the inner surface of the recessed part 61. The protective part 130 may be provided, for example, so as to cover the inner surface of the recessed part 61 below the lid part 11. For example, the protective part 130 may be provided so as to cover the entire inner surface of the recessed part 61 located below the lid part 11. Furthermore, the protective part 130 may be provided so as to be located, for example, between the lid part 11 and the pusher 60. Note that covering the entire inner surface here includes not only completely covering the entire inner surface but also substantially covering the entire inner surface (for example, covering 80% or more of the surface area of the inner surface).

[0140] The protective portion 130 is a metal layer formed of metal or an insulating layer formed of an insulating material. For example, when the protective portion 130 is a metal layer, it is formed of a metal such as stainless steel (SUS), but it may also be formed of other metals such as aluminum. When the protective portion 130 is a metal layer, the strength of the protective portion 130 can be improved, thereby more reliably suppressing damage to the pusher 60. Furthermore, when the protective portion 130 is an insulating layer, it may be formed of a material different from that of the pusher 60. For example, when the protective portion 130 is an insulating layer, it may be formed of a material harder than the pusher 60. The insulating layer may be formed of silicon oxide such as SiO2, silicon nitride such as SiN, or silicon oxynitride such as SiON. When the protective portion 130 is an insulating layer, it is possible to suppress electrical conduction between the opening 11a and the housing via the protective portion 130.

[0141] The protection portion 130 is formed integrally with the pusher 60 by, for example, coating the inner surface of the recess 61 .

[0142] It should be noted that the protective part 130 does not necessarily have to be formed integrally with the pusher 60, and may be a separate part. The protective part 130 may be, for example, a separate part having a shape that follows the inner surface of the recess 61. For example, the protective part 130 may be placed on the inner surface of the recess 61 or may be disposed at a distance from the inner surface of the recess 61. In the former case, the inner surface of the recess 61 and the protective part 130 are in surface contact, for example.

[0143] In this way, when the protective part 130 and the pusher 60 are not integrally formed, the protective part 130 is an example of a metal member formed of a metal layer or an insulating member formed of an insulating layer different from the material of the pusher 60. In other words, the protective part 130 is a metal member or insulating member provided inside the recess 61, and the metal member or insulating member may be provided so as to be positioned between the lid part 11 and the pusher 60.

[0144] The protective section 130 may have a double structure in which an insulating layer is formed above a metal layer.

[0145] In this embodiment, the protection part 130 moves downward together with the pusher 60 during the blocking operation.

[0146] In such a cut-off device 2, as in embodiment 1, the protective part 130 can prevent the opening 11a opened by the igniter 10 generating gas from coming into contact with the pusher 60, which can result in damage to the recess 61 of the pusher 60.

[0147] (Another circuit breaker configuration) A shutoff device having a different structure of the separation part 51 will be described with reference to Fig. 8 and Fig. 9. Fig. 8 is a cross-sectional view showing a shutoff device according to another embodiment. Fig. 9 is a cross-sectional view for explaining a state in which the separation part of the shutoff device according to the another embodiment shown in Fig. 8 has moved downward. 8 and 9, the same components as those of the above-described circuit breakers 1, 1a, 1b, 1c, 1d, and 2 are denoted by the same reference numerals, and the description thereof will be omitted.

[0148] In the above-described circuit breaker 1, the pusher 60 receives the pressure of the gas generated by the igniter 10 and separates the separating portion 51 from the conductor 50, causing the separating portion 51 to move downward. In other words, by separating the separating portion 51 from the holding portion 52, there is no electrical continuity between the separating portion 51 and the holding portion 52, and as a result, there is no electrical continuity between the conductor 50. However, the circuit breaker of the present disclosure does not necessarily have to be configured to separate the separating portion 51.

[0149] 7 and 8, the pusher 60 may move the separating portion downward in response to the pressure of the gas generated by the igniter 10, thereby rendering the conductor 50 non-conductive. In other words, the separating portion 51 in contact with the holding portion 52 may be moved downward to separate the separating portion 51 from the holding portion 52, thereby rendering the conductor 50 non-conductive.

[0150] (Other embodiments) Although the blocking device according to one or more aspects has been described above based on each embodiment, etc., the present disclosure is not limited to these embodiments, etc. As long as it does not deviate from the spirit of the present disclosure, various modifications that a person skilled in the art can conceive of to this embodiment and forms constructed by combining components of different embodiments may also be included in the present disclosure.

[0151] For example, in each of the above embodiments, an example has been described in which the housing is made of metal, but this is not limited to this, and for example, the lower housing of the housing may be made of a resin that has deformable properties.

[0152] Furthermore, the manner (number, shape, etc.) of the incisions shown in Figures 3B and 3C in the above-described first embodiment is merely an example, and is not limited thereto as long as the lid portion is in the desired open state. Furthermore, the incisions do not necessarily have to be provided on the lid portion. Furthermore, in Figure 4B, the opening 11a is torn only at the location of the incision 11a1, but in an actual product, the tear may reach the outer frame portion 11b. In other words, the opening 11a in an actual product may be larger than the opening 11a shown in Figure 4B.

[0153] In addition, in each of the above-described embodiments, the lower end of the protective part may be bent outward to such an extent that it does not come into contact with the pusher. The outward bending means a direction from the inside of the isolating device to the outside of the isolating device in a plan view of the isolating device.

[0154] Furthermore, the order of the steps in the manufacturing method for a circuit breaker described in each of the above embodiments may be interchanged. Furthermore, the steps in the manufacturing method for a circuit breaker described in the above embodiments may be performed in a single process or in separate processes. "Performed in a single process" is intended to include the cases where each process is performed using a single device, where each process is performed consecutively, or where each process is performed at the same location. Furthermore, "separate processes" is intended to include the cases where each process is performed using a separate device, where each process is performed at a different time (e.g., on a different day), or where each process is performed at a different location. [Industrial Applicability]

[0155] The present disclosure is useful for circuit breakers and the like that are arranged in electric circuits. [Explanation of symbols]

[0156] 1, 1a, 1b, 1c, 1d, 2 Circuit Breaker 10 Igniter 11 Lid 11a opening 11a1 cut 11b Outer frame 20 Upper housing 21 Small diameter section 22 Connection 23 Large diameter section 30 Lower housing 30a convex part 33 Bottom 34 Side wall 40 Resin parts 41 Buried section 42, 81, 81a First cylindrical part 43, 82, 82a, 82b 2nd cylinder part 50 Conductors 51 Separation section 52 Holding part 53 Cut surface 60 Pusher 61, 61a, 61b recesses 62 Part 1 63, 64, 65 2nd part 70 space 80, 80a, 80b, 80c, 80d, 130 protection part 82b1 Slope section 83 Flange 90, 92, 94, 96 Elastic members 100 Fixing member 110 Metal parts (metal components) 112, 120 Resin part (resin member) 121 Part 1 122 Part 2 123 Part 3 L1, L2, L3, L4 lengths

Claims

1. The housing and a pusher located inside the housing; an igniter that holds gunpowder therein, has a lid portion provided between the gunpowder and the pusher, is disposed above the pusher, and generates gas; a protective portion fixed to the housing or the igniter so as to surround the igniter; a conductor having a separation portion located below the pusher; Equipped with The pusher moves the separating portion downward when receiving pressure of the gas generated by the igniter, When viewed from above, a lower end of the protection portion is located inside an outer surface of the pusher, the lid portion has an opening configured to open when subjected to the pressure of the gas, The lower end of the protection part is located lower than the lower end of the lid part. Shut-off device.

2. The protective part is a first cylindrical portion connected to the housing; a second cylindrical portion located below the first cylindrical portion and having a smaller diameter than the first cylindrical portion; have The shutoff device according to claim 1 .

3. The distance from the lower end of the lid portion to the lower end of the second cylindrical portion is equal to or longer than half the length of the notch provided in the opening of the lid portion. The shutoff device according to claim 2 .

4. The housing is made of metal, The protective part is a metal member connected to the housing; a resin member disposed inside the metal member; and the metal member includes the first cylindrical portion and the second cylindrical portion, The vertical length from the upper end of the resin member to the lower end of the resin member is greater than the vertical length from the lower end of the lid portion to the lower end of the second cylindrical portion. The shutoff device according to claim 2 or 3.

5. The resin member is a first portion disposed inside the metal member; a second portion disposed outside the metal member; a third portion connecting the first portion and the second portion; and The third portion is located below the metal member. The shutoff device according to claim 4.

6. the protective portion has a resin portion and a metal portion, The resin portion and the metal portion are integrally formed, The resin portion covers the inner surface of the metal portion below the lid portion. The shutoff device according to claim 2 or 3.

7. The distance from the bottom end of the lid to the bottom end of the resin part is equal to or greater than half the length of the notch provided in the opening of the lid. The shutoff device according to claim 6.

8. The housing and a pusher located inside the housing; an igniter disposed above the pusher and configured to generate gas; a protective portion provided to cover a surface of the pusher facing the igniter; a conductor having a separation portion located below the pusher; Equipped with The pusher moves the separating portion downward when receiving pressure of the gas generated by the igniter, When viewed from above, the lower end of the protection portion is located inside the outer surface of the pusher. Shut-off device.

9. the protective portion is a metal layer or an insulating layer made of a material different from that of the pusher, The protection portion is located between the igniter and the pusher. The shutoff device according to claim 8.

10. the protective portion is a metal member or an insulating member, The metal member or the insulating member is located between the igniter and the pusher. The shutoff device according to claim 8.

11. The protective portion covers the entire surface of the pusher that faces the igniter and is located below the igniter. The shutoff device according to any one of claims 8 to 10.

12. The housing and a pusher having a protective portion including a metal layer and an insulating layer and positioned inside the housing; an igniter disposed above the pusher and configured to generate gas; a conductor having a separation portion located below the pusher; Equipped with The pusher moves the separating portion downward when receiving pressure of the gas generated by the igniter, The insulating layer is located between the metal layer and the igniter. Shut-off device.

13. the igniter has a gunpowder and a lid portion provided between the gunpowder and the pusher, The protective part is a first portion located more inward than the lid portion when viewed from above; a second portion located outside the lid portion when viewed from above; The shutoff device according to claim 8 or 12.

14. When the pusher receives pressure of the gas generated by the igniter, it separates the separation portion from the conductor and moves the separation portion downward. The shutoff device according to claim 8 or 12.

Images