Cutting device

Abstract

A cutting device (1) is provided with: a housing (for example, an upper housing (20) and a lower housing (30)); an igniter (10) disposed in the housing; a conductor (50) having a separation part (51) disposed below the igniter (10); a pusher (60) that is disposed at a first position between the separation unit (51) and the igniter (10) and that is capable of breaking the separation unit (51) from the first position and moving toward a second position that is located below the first position; and a cooling material (120) disposed below the pusher (60) and provided with a recess or a through-hole.

Description

Technical Field

[0001] The present disclosure relates to a cutting device. Background Art

[0002] Conventionally, there has been known a cutting device used in connection with an electric circuit. Such a cutting device includes a housing and a pusher disposed within the housing. The pusher moves from a first position to a second position by gas generated by ignition of an igniter, and breaks a conductor when the pusher moves from the first position to the second position, thereby cutting off the electric circuit. Since an arc may be generated when the conductor breaks, Patent Document 1 discloses a cutting device having a cooling material for arc extinction inside the housing (see Patent Document 1).

[0003] Prior art documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2021-61147 Summary of the Invention

[0006] From the viewpoint of improving arc extinction performance and the like, an improvement in cooling performance in a cutting device is desired.

[0007] A cutting device according to one aspect of the present disclosure includes: a housing; an igniter disposed within the housing; a conductor having a separation portion disposed below the igniter; a pusher disposed at a first position between the separation portion and the igniter, capable of breaking the separation portion from the first position and moving toward a second position located below the first position; and a cooling material disposed below the pusher, provided with a recess or a through hole.

[0008] A cutting device according to one aspect of the present disclosure includes: a housing; an igniter disposed within the housing; a conductor having a separation portion disposed below the igniter; a pusher disposed at a first position between the separation portion and the igniter, capable of breaking the separation portion from the first position and moving toward a second position located below the first position; and a cooling material disposed below the pusher, the cooling material being formed by laminating a plurality of layers and disposed such that end faces of the plurality of layers face the lower surface of the pusher.

[0009] According to one aspect of the present disclosure, it is possible to realize a cutting device capable of improving cooling performance as compared with the prior art. Brief Description of the Drawings

[0010] Figure 1 It is a perspective view showing the cutting device of Embodiment 1.

[0011] Figure 2 This is a cross-sectional view of the cutting device according to the first embodiment cut along the YZ plane.

[0012] Figure 3 This is a cross-sectional view of the cutting device according to the first embodiment cut along the XZ plane.

[0013] Figure 4 It is a perspective view showing the coolant according to the first embodiment.

[0014] Figure 5 This is a flowchart showing the manufacturing process of the cutting device according to the first embodiment.

[0015] Figure 6 This is a perspective view showing a coolant according to Modification 1 of Embodiment 1.

[0016] Figure 7 This is a perspective view showing a coolant according to a second modification of the first embodiment.

[0017] Figure 8 This is a perspective view showing a coolant according to a third modification of the first embodiment.

[0018] Figure 9 This is a perspective view showing a coolant according to a fourth modification of the first embodiment.

[0019] Figure 10 This is a cross-sectional view of the cutting device according to the second embodiment cut along the XZ plane.

[0020] Figure 11A It is a perspective view showing another example of the coolant.

[0021] Figure 11B It is a perspective view showing another example of the coolant.

[0022] Figure 11C It is a perspective view showing another example of the coolant. DETAILED DESCRIPTION

[0023] A cutting device according to one embodiment of the present invention comprises: a shell; an igniter, which is arranged in the shell; a conductor, which has a separation portion arranged below the igniter; a pusher, which is arranged at a first position between the separation portion and the igniter, and can break the separation portion from the first position and move toward a second position located below the first position; and a cooling material, which is arranged below the pusher and has a recess or a through hole.

[0024] Accordingly, compared with the case where no recess or through-hole is provided in the cooling material, the area of contact between the arc or gas generated during ignition and the cooling material can be increased. By this increase in area, the heat exchange between the arc or gas and the cooling material can be promoted, and thus the heat of the arc or gas is easily absorbed. Therefore, according to the cutting device, the cooling performance can be improved compared with the prior art.

[0025] Alternatively, for example, the recess or the through-hole may be one of a plurality of recesses or a plurality of through-holes provided in the cooling material.

[0026] Accordingly, since there are a plurality of recesses or through-holes, the cooling performance can be further improved according to the cutting device.

[0027] Alternatively, for example, it is preferable that a hole penetrating the separation part is provided in the separation part, and the recess or the through-hole of the cooling material overlaps with the hole of the separation part in a top view.

[0028] Accordingly, since the gas generated during ignition easily flows from the hole of the separation part to the recess or the through-hole, the heat exchange in the recess or the through-hole can be promoted. Therefore, according to the cutting device, the cooling efficiency in the recess or the through-hole can be improved.

[0029] Alternatively, for example, it is preferable that the recess is provided in the cooling material, the recess opens upward, and faces the lower surface of the pusher.

[0030] Accordingly, since the gas flowing from the first position to the second position during ignition easily flows into the recess, the heat exchange in the recess can be promoted. Therefore, according to the cutting device, the cooling efficiency in the recess can be improved.

[0031] Alternatively, for example, it is preferable that the through-hole is provided in the cooling material, and the through-hole penetrates the cooling material from the upper surface to the lower surface of the cooling material.

[0032] Accordingly, since the gas flowing from the first position to the second position during ignition easily flows into the through-hole, the heat exchange in the through-hole can be promoted. Therefore, according to the cutting device, the cooling performance in the through-hole can be further improved.

[0033] Alternatively, for example, it is preferable that the cooling material is located below the separation part, and the width of the opening of the recess or the width of the opening of the through-hole is larger than the width of the separation part.

[0034] Accordingly, since it is possible to prevent the opening of the recess or the opening of the through-hole from being blocked by the separation part during ignition, the heat exchange in the recess or the through-hole can be performed more reliably.

[0035] In addition, for example, it is preferable that the cooling material is formed by laminating a plurality of layers and is arranged such that the end faces of the respective layers face the lower surface of the pusher.

[0036] Thus, since the gas flowing in the direction from the first position to the second position during ignition easily flows into each interface of the plurality of layers, according to the cutting device, the cooling performance can be further improved compared with the prior art.

[0037] In addition, for example, it may also be that the concave portion is provided on the side surface of the cooling material, or the through hole penetrates the side surface of the cooling material.

[0038] Thus, the gas flowing in from the side surface of the cooling material during ignition can be effectively cooled.

[0039] In addition, a cutting device according to an aspect of the present disclosure includes: a housing; an igniter disposed in the housing; a conductor having a separation portion disposed below the igniter; a pusher disposed at a first position between the separation portion and the igniter, capable of breaking the separation portion from the first position and moving toward a second position located below the first position; and a cooling material disposed below the pusher, the cooling material being formed by laminating a plurality of layers and arranged such that the end faces of the respective layers face the lower surface of the pusher.

[0040] Thus, since the gas flowing in the direction from the first position to the second position during ignition easily flows into each interface of the plurality of layers, according to the cutting device, the cooling performance can be improved compared with the prior art. For example, according to the cutting device, the cooling performance is improved compared with the case where the cooling material is arranged such that the gas flows orthogonally to each interface of the plurality of layers.

[0041] Hereinafter, each embodiment and the like will be specifically described with reference to the drawings.

[0042] In addition, each of the embodiments and the like described below represents a general or specific example. The numerical values, shapes, constituent elements, arrangement positions of the constituent elements, connection methods, steps (processes), the order of steps (processes), etc. shown in the following embodiments and the like are examples and are not intended to limit the present disclosure. In addition, among the constituent elements of the following embodiments, the constituent elements not described in the independent claims are described as optional constituent elements.

[0043] In addition, the drawings are schematic diagrams and are not necessarily strictly drawn. Thus, for example, the scales and the like may not be the same in each drawing. In addition, in each drawing, substantially the same structures are denoted by the same reference numerals, and repeated descriptions are omitted or simplified.

[0044] In addition, in this specification and the accompanying drawings, the X-axis, Y-axis and Z-axis show the three axes of the three-dimensional orthogonal coordinate system of the right-hand system. In each embodiment, the Z-axis direction is set to the moving direction of the pusher, the Y-axis direction is set to the direction in which the conductor extends, and the X-axis direction is set to the width direction of the conductor. In addition, in this specification, "looking down" means the situation of observing from the positive side of the Z-axis toward the negative side of the Z-axis, and "sectioning" means the situation of observing the cut surface obtained by cutting the cutting device through the Z-axis and being parallel to the Z-axis, and the side means the direction orthogonal to the Z-axis direction. In addition, in this specification, the Z-axis direction is also recorded as the up-down direction. However, in this specification, the up-down direction of the cutting device is only for the convenience of explaining each embodiment, etc. and represents the relative positional relationship of each element in the cutting device. For example, in this specification, the terms such as "above" and "below" do not refer to the upper direction (vertical above) and the lower direction (vertical below) in absolute spatial cognition, but are used as terms defined by the relative positional relationship based on the moving direction of the pusher. In addition, the posture when the cutting device is set is not limited to the direction shown in the accompanying drawings.

[0045] In addition, in this specification, terms such as equal and orthogonal that indicate the relationship between elements, terms such as circle that indicate the shape of elements, and numerical values and numerical ranges are not expressions with strict meanings, but also mean expressions that include substantially equivalent ranges, such as differences of about a few percent (or about 10%).

[0046] In the present specification, ordinal numbers such as “first” and “second” do not indicate the number or order of components unless otherwise specified, but are used to distinguish components of the same kind to avoid confusion.

[0047] (Implementation Method 1)

[0048] Below, refer to Figures 1 to 5 The cutting device according to this embodiment will be described.

[0049] [1-1. Structure of cutting device]

[0050] First, refer to Figures 1 to 4 The structure of the cutting device according to this embodiment will be described. Figure 1 It is a perspective view showing the cutting device 1 according to this embodiment. Figure 2 This is a cross-sectional view of the cutting device 1 according to the present embodiment cut along the YZ plane. Figure 3 This is a cross-sectional view of the cutting device 1 according to the present embodiment cut along an XZ plane.

[0051] Figure 1This is a view obtained by observing the cutting device 1 in a state rotated about the Z-axis as the rotation axis when viewed from the X-axis direction as the front view. Additionally, Figure 2 This is a cross-sectional view of the cutting device 1 in its (initial state) when not performing a cutting operation, cut along the YZ plane. Figure 3 This is a cross-sectional view of the cutting device 1 in its (initial state) when not performing a cutting operation, cut along the XZ plane.

[0052] As Figures 1 to 3 shown, the cutting device 1 includes an igniter 10, an upper housing 20, a lower housing 30, a resin member 40, a conductor 50, a pusher 60, a protection part 80, elastic members 90, 92, 94, 96, and a cooling material 120. The cutting device 1 is a device that is mounted on an object having a circuit and is used to prevent an abnormal damage from becoming larger by operating and cutting off the circuit when an abnormality occurs in the circuit, system, etc. within the object. The cutting device 1 is, for example, mounted on a vehicle as an example of an object, connected between a motor and a battery for driving the motor (such as a lithium-ion battery), and cuts off the electrical connection between the motor and the battery for driving the motor in an emergency such as an abnormality or an accident. In addition, the object may be an object other than a vehicle, and examples include home appliances, a solar power generation system, etc., but there is no particular limitation.

[0053] The igniter 10 holds gunpowder inside, has a lid part 11 provided between the gunpowder and the pusher 60, and is disposed within the recess 61 and is capable of generating gas. For example, the igniter 10 is an electronic igniter having a gunpowder part and a conductive needle, the gunpowder part having ignition powder, and the conductive needle being used to energize the gunpowder part. During operation, a working current for igniting the ignition powder is supplied from an external power source to the conductive needle, whereby the ignition powder ignites and burns, generating gas (combustion gas). In addition, by forming the recess 61, the cutting device 1 can be miniaturized.

[0054] The igniter 10 is fixed to the small-diameter part 21 above the upper housing 20.

[0055] The upper housing 20 and the lower housing 30 are members that constitute the outer contour of the cutting device 1 and house the igniter 10, a part of the resin member 40 and the conductor 50, the pusher 60, the protection part 80, the elastic members 92, 94, 96, and the cooling material 120. Additionally, a space 70 extending in the vertical direction is formed inside the upper housing 20 and the lower housing 30. The space 70 is formed as a cylindrical space in such a manner that the pusher 60 can move. The pusher 60 is housed on the upper end side (positive Z-axis side) in the vertical direction (Z-axis direction) of the space 70.

[0056] The upper housing 20 and the lower housing 30 are each formed of a metal such as stainless steel (SUS), but may also be formed of other metals such as aluminum. In addition, the upper housing 20 and the lower housing 30 have a cylindrical outer shape, but the shape is not limited thereto. Further, the upper housing 20 and the lower housing 30 are directly connected and fixed, for example, by welding or the like. The upper housing 20 and the lower housing 30 are an example of housings.

[0057] The upper housing 20 is, for example, a cylinder member having a stepped cylindrical shape, and the inside thereof is a cavity. The upper housing 20 has a small-diameter portion 21 located above, a large-diameter portion 23 located below, a connecting portion 22 connecting the small-diameter portion 21 and the large-diameter portion 23, and a first fixing portion 24. The small-diameter portion 21, the connecting portion 22, the large-diameter portion 23, and the first fixing portion 24 are integrally formed. The small-diameter portion 21 and the large-diameter portion 23 are coaxially arranged, and the diameter of the large-diameter portion 23 is larger than the diameter of the small-diameter portion 21. The first main body portion 20a is formed by the small-diameter portion 21, the connecting portion 22, and the large-diameter portion 23.

[0058] The first fixing portion 24 is a portion for fixing the upper housing 20 and the lower housing 30, and is provided to protrude downward from the first main body portion 20a (for example, the large-diameter portion 23).

[0059] The lower housing 30 is a member having a bottomed cylindrical shape with a cavity inside, and has a convex portion 30a protruding upward. Specifically, the lower housing 30 has a convex portion 30a, a bottom portion 33, a side wall portion 34, and a second fixing portion 35. The convex portion 30a, the bottom portion 33, the side wall portion 34, and the second fixing portion 35 are integrally formed. In addition, a cooling material 120 is disposed inside the lower housing 30. The second main body portion 30b is formed by the convex portion 30a, the bottom portion 33, and the side wall portion 34.

[0060] In addition, in this specification, integrally formed means that at least one of the following holds: each structural portion is formed of the same material, formed simultaneously, and is the same object (single object).

[0061] The convex portion 30a is configured to be located below the separation portion 51 and protrude upward in the space 70. The convex portion 30a is connected to one end of the bottom portion 33 and protrudes upward (positive Z-axis side) from the bottom portion 33 in the space 70. The convex portion 30a is configured to contact the pusher 60 that moves downward due to the gas generated by the igniter 10, and be pressed by the pusher 60 to deform downward. That is, the convex portion 30a has a function of absorbing the impact (stress) from the pusher 60 by deforming.

[0062] Further, when observing the cutting device 1 from the negative side of the Z-axis toward the positive side of the Z-axis, the convex portion 30a that forms the concave portion of the lower housing 30 is exposed when observing from the outside of the cutting device 1. In the present embodiment, the convex portion 30a has a shape that tapers at the tip as it goes upward in the space 70, but the shape is not limited thereto.

[0063] In addition, in the present specification, contact means that stress can be transmitted from one of the two members to the other, which may refer to the case where the two members are in direct contact, or may be configured such that although other members are disposed between the two members, stress can be transmitted from one of the two members to the other via the other members. For example, the contact here may refer to the case where the convex portion 30a and the separation portion 51 are in direct contact, or may be configured such that the stress of the convex portion 30a can be transmitted to the separation portion 51 via other members disposed between the convex portion 30a and the separation portion 51. In the latter example, for example, an arc extinguishing agent (such as the cooling material 120) may be disposed between the convex portion 30a and the separation portion 51, or the separation portion 51 may be disposed between the convex portion 30a and the pusher 60.

[0064] The bottom portion 33 connects the convex portion 30a and the side wall portion 34. In other words, the convex portion 30a and the side wall portion 34 are connected via the bottom portion 33. The outer surface and the inner surface of the bottom portion 33 are inclined upward from the convex portion 30a toward the side wall portion 34.

[0065] The side wall portion 34 is formed to be connected to the other end of the bottom portion 33 and extend upward from the bottom portion 33. The side wall portion 34 has a cylindrical shape, and has a cylindrical shape in the present embodiment. The side wall portion 34 is disposed coaxially with the small diameter portion 21 and the large diameter portion 23. For example, the diameter of the side wall portion 34 is equal to the diameter of the large diameter portion 23.

[0066] The second fixing portion 35 is a portion for fixing the upper housing 20 and the lower housing 30, and is provided to protrude upward from the second main body portion 30b (such as the side wall portion 34). The second fixing portion 35 is provided at a position corresponding to the first fixing portion 24, and is configured to at least partially overlap the first fixing portion 24 when observing in the radial direction (in the Figure 3 example, the X-axis direction).

[0067] In the present embodiment, the second fixing portion 35 is directly connected (joined) to the first fixing portion 24, and is connected to the first fixing portion 24 by welding, for example. The second fixing portion 35 is joined to the first fixing portion 24 by the welding portion 110. The welding portion 110 is a portion where the first fixing portion 24 and the second fixing portion 35 are welded together. The welding is performed by laser welding, but may also be achieved by any method such as TIG (Tungsten Inert Gas) welding or projection welding.

[0068] In addition, the second fixing portion 35 can be connected to the first fixing portion 24 by a method other than welding, or can be directly connected using, for example, solder. In addition, the second fixing portion 35 is not limited to the case of being directly connected to the first fixing portion 24, and can also be connected using a fastening member such as a screw.

[0069] The thicknesses of the convex portion 30a, the bottom portion 33, the side wall portion 34, and the second fixing portion 35 are the same in the present embodiment, but can also be different from each other, for example.

[0070] The resin member 40 is a member that covers a part of the conductor 50. In addition, the resin member 40 is a part of the constituent elements that form the space 70. The resin member 40 has a buried portion 41, a first cylindrical portion 42, and a second cylindrical portion 43.

[0071] The buried portion 41 is the part of the resin member 40 that buries the conductor 50. For example, the buried portion 41 is partially exposed from the housing. A through hole for arranging the conductor 50 (specifically, the holding portion 52) is formed in the buried portion 41.

[0072] The first cylindrical portion 42 is the part of the resin member 40 that is arranged inside the housing. When the cutting operation is not performed (when gas is not generated by the igniter 10), the pusher 60 is arranged inside it. That is, the first cylindrical portion 42 is located between the housing and the pusher 60. The inner diameter of the first cylindrical portion 42 is smaller than the inner diameter of the second cylindrical portion 43. In addition, Figure 2 and Figure 3 The position of the pusher 60 shown indicates the initial position when the cutting operation is not performed.

[0073] The second cylindrical portion 43 is the part of the resin member 40 that is arranged inside the housing and is located at a position lower than the first cylindrical portion 42. The inner diameter of the second cylindrical portion 43 is larger than the inner diameter of the first cylindrical portion 42. Thereby, the volume of the lower side in the space 70 can be enlarged. Therefore, it is possible to suppress an increase in the pressure inside the housing due to the gas generated by the igniter 10 and the movement of the pusher 60 caused by the gas, and thus it is possible to suppress deformation of the cutting device 1.

[0074] In this way, the pusher 60 moves inside the space 70 formed by the first cylindrical portion 42 and the second cylindrical portion 43. In addition, the first cylindrical portion 42 and the second cylindrical portion 43 are not limited to having different inner diameters, and the inner diameters can also be the same.

[0075] In addition, the resin member 40 has an inner side wall 40a, a first outer side wall 40b, and a second outer side wall 40c. The first outer side wall 40b and the second outer side wall 40c are the walls inside the recesses formed along the circumferential direction in the outer side wall of the resin member 40.

[0076] The inner wall 40a is the inner surface of the resin member 40 and faces the outer wall 60b of the pusher 60.

[0077] The first outer wall 40b is a portion that is disposed inside the housing, is located above the separation portion 51, and is covered by the upper housing 20. The first outer wall 40b is formed in a circumferential shape so as to face the large-diameter portion 23 in a cross-sectional view.

[0078] The second outer wall 40c is a portion that is disposed inside the housing, is located below the separation portion 51, and is covered by the lower housing 30. The second outer wall 40c is formed in a circumferential shape so as to face the side wall portion 34 in a cross-sectional view.

[0079] The conductor 50 is a conductive metal body that is partially located inside the upper housing 20 and the lower housing 30. In addition, the conductor 50 forms a part of the circuit when the cutting device 1 is installed in a predetermined circuit and is also called a bus bar. The conductor 50 is a flat plate-shaped member configured to be held by the resin member 40 and 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 can be formed of a metal such as copper (Cu), for example. However, the conductor 50 can be formed of a metal other than copper or an alloy of copper and other metals. For example, the conductor 50 can also be configured to contain manganese (Mn), nickel (Ni), platinum (Pt), etc.

[0081] The separation portion 51 is a portion of the conductor 50 that is cut by the pusher 60 that bears the pressure of the gas generated by the igniter 10, and is located below the pusher 60 in the initial position. A hole 51a (through hole) that penetrates the separation portion 51 is formed in the separation portion 51. The hole 51a is, for example, one, but can also be multiple. The top view shape of the hole 51a is, for example, circular, but can also be rectangular or the like, and the shape is not particularly limited. In addition, the hole 51a may not be formed.

[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 the pusher 60 in a top view, and is, for example, a portion that overlaps the resin member 40 in a top view and a portion located outside the housing. The holding portion 52 maintains the state of being held by the resin member 40 even after the separation portion 51 is cut.

[0083] The pusher 60 is located below the igniter 10, is configured to be movable downward, and moves downward when an abnormality occurs in the system or the like, thereby cutting off the conductor 50 and emergently cutting off the conduction in the circuit. In this way, the pusher 60 is configured to withstand the pressure of the gas generated by the igniter 10 and cut the separation portion 51 from the conductor 50. In this way, the pusher 60 is disposed at the first position (refer to Figure 2 and Figure 3 ) between the separation portion 51 and the igniter 10, breaks the separation portion 51 from the first position, and moves toward the second position located below the first position. The second position is, for example, the position of the pusher 60 when the pusher 60 and the separation portion 51 move downward together and the separation portion 51 contacts the convex portion 30a.

[0084] The pusher 60 is formed of an insulating member such as synthetic resin. In the present embodiment, the pusher 60 is formed of nylon. The pusher 60 has a cylindrical shape and an outer diameter corresponding to the inner diameter of the small-diameter portion 21 of the upper housing 20. In addition, the pusher 60 has a concave portion 61, and the igniter 10 is disposed inside the concave portion 61. In addition, the shape of the pusher 60 is not limited to the above, and can be appropriately changed according to the shape of the upper housing 20 and the lower housing 30 and the like. The concave portion 61 is the upper part of the pusher 60 or the part provided with a recess facing downward.

[0085] In addition, in the examples of Figure 2 and Figure 3 , the concave portion 61 is the part surrounded by the small-diameter portion 21 and the connecting portion 22 on the side surface in the state where the cutting device 1 does not perform the cutting operation (the state shown in Figure 2 and Figure 3 ).

[0086] The concave portion 61 has a first portion 62 and a second portion 63. When viewed from above, the diameter (for example, the inner diameter) of the first portion 62 is larger than that of the first cylindrical portion 81 of the protection portion 80. The second portion 63 is located below the first portion 62 and has a diameter (for example, the inner diameter) larger than that of the second cylindrical portion 82. When viewed from above, the diameter of the first portion 62 is larger than that of the second portion 63. For example, in a sectional view, the inner wall of the first portion 62 is a conical shape whose diameter becomes smaller as it goes toward the second portion 63, but it may also be a stepped shape whose diameter decreases stepwise.

[0087] The protection portion 80 is a component for suppressing the following situation: when the igniter 10 generates gas, the pusher 60 is damaged by the cover portion 11 of the igniter 10. Specifically, the protection portion 80 is such a member that, by becoming a barrier against a situation where the cover portion 11 is largely opened locally, it is used to suppress the situation where the local portion that has opened due to the gas generation by the igniter 10 contacts the pusher 60 and causes the concave portion 61 of the pusher 60 to be damaged.

[0088] The protection part 80 is provided in the housing (such as the upper housing 20) or the igniter 10, and has a part located inside the recess 61. In the present embodiment, the protection part 80 is provided in the housing (specifically, the small-diameter part 21). The protection part 80 is fixed to the small-diameter part 21 by welding, for example, but the fixing method is not limited thereto.

[0089] As Figure 2 and Figure 3 shown, the protection part 80 has a first cylindrical part 81 and a second cylindrical part 82. The first cylindrical part 81 and the second cylindrical part 82 are integrally formed.

[0090] The first cylindrical part 81 is a cylindrical part surrounding the side of the igniter 10, and has a shape along the igniter 10. In the present embodiment, in a cross-sectional view, the first cylindrical part 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 when going downward. In addition, the shape of the first cylindrical part 81 is not limited thereto. For example, the first cylindrical part 81 may be a conical shape in which the diameter becomes smaller as it goes downward, or other shapes.

[0091] Alternatively, at least a part of the first cylindrical part 81 may be in contact with the igniter 10. The second cylindrical part 82 is disposed at the lower end of the first cylindrical part 81.

[0092] In addition, the first cylindrical part 81 has a flange part 83 at the upper side. The flange part 83 is a ring-shaped part (for example, a plate-like member) formed to protrude outward in a top view from the upper end of the first cylindrical part 81, and is fixed to the small-diameter part 21 by welding or the like. For example, at least a part of the flange part 83 is disposed between the first part 62 and the small-diameter part 21. In this way, the first cylindrical part 81 has a part connected to the housing and is fixed to the housing.

[0093] The second cylindrical part 82 is a ring-shaped part located at a position lower than the first cylindrical part 81 and having a diameter (for example, the inner diameter) smaller than that of the first cylindrical part 81. The second cylindrical part 82 is a part that protrudes linearly from the lower end of the first cylindrical part 81 toward the negative Z-axis side and contacts the lid part 11 when gas is generated. The lower end of the second cylindrical part 82 (the end on the negative Z-axis side, for example, the lowermost end) is located below (on the negative Z-axis side) the lower end (the end on the negative Z-axis side, for example, the lowermost end) of the lid part 11 in a state where no gas is generated.

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

[0095] As Figure 2 and Figure 3As shown, the elastic members 90, 92, 94, and 96 are elastic members such as rubber and are O-rings formed in a ring shape. The elastic members 90, 92, 94, and 96 are respectively arranged in a pressed state (deformed state).

[0096] The elastic member 90 is arranged in the space formed between the fixed member 100, the igniter 10, and the small-diameter portion 21. The fixed member 100 is used to fix the igniter 10 arranged in the recess 61. The elastic member 90 is in contact with the fixed member 100, the igniter 10, and the small-diameter portion 21 respectively, and is pressed by the fixed member 100, the igniter 10, and the small-diameter portion 21 respectively, for example.

[0097] In the present embodiment, the elastic member 92 is provided between the housing and the pusher 60, is pressed by the housing, and presses the outer side surface (for example, the outer wall 60b) of the pusher 60. In addition, the elastic member 92 is arranged along the outer side surface of the pusher 60. In the present embodiment, the elastic member 92 is arranged in the space formed between the housing (for example, the connecting portion 22), the pusher 60, and the resin member 40 to suppress the situation where the internal space of the recess 61 and the space outside the internal space (for example, the space between the pusher 60 and the resin member 40) are spatially connected. The elastic member 92 suppresses the leakage of the gas generated by the igniter 10 from the internal space of the recess 61 to the external space. Thereby, the situation can be suppressed that the gas generated by the igniter 10 escapes from the internal space of the recess 61, resulting in a decrease in the pressure of the gas in the recess 61.

[0098] In the present embodiment, the elastic member 92 is in contact with (for example, surface contact) the housing, the pusher 60, and the resin member 40, and is pressed by the housing, the pusher 60, and the resin member 40 respectively, for example.

[0099] The cross-sectional shape of the elastic member 92 when pressed is a triangular shape, but it is not limited thereto. In addition, for the cross-sectional shape of the elastic member 92 when not pressed, as long as the internal space of the recess 61 and the conductor 50 can be spatially separated after pressing, there is no particular limitation, and it can be circular, polygonal (for example, quadrilateral), or elliptical.

[0100] In addition, in the present specification, for "pressing", in addition to the case where one member presses another member being included in pressing, the case where the one member or other members are pressed by the rebounding force generated by the elastic deformation of the other member is also included in pressing.

[0101] The elastic member 94 is disposed above the conductor 50 and in a space formed between the circumferential concave portion formed in the resin member 40 and the housing (for example, the large-diameter portion 23) to suppress the spatial connection between the space above the conductor 50 and the external space. In the present embodiment, the elastic member 94 is in contact with the first outer side wall 40b of the resin member 40 and the large-diameter portion 23 between the first outer side wall 40b of the resin member 40 and the large-diameter portion 23, and is respectively pressed by the first outer side wall 40b of the resin member 40 and the large-diameter portion 23, for example.

[0102] The elastic member 96 is disposed below the conductor 50 and in a space formed between the circumferential concave portion formed in the resin member 40 and the lower housing 30 (for example, the side wall portion 34) to suppress the spatial connection between the space below the conductor 50 and the external space. In the present embodiment, the elastic member 96 is in contact with the second outer side wall 40c of the resin member 40 and the side wall portion 34 between the second outer side wall 40c of the resin member 40 and the side wall portion 34, and is respectively pressed by the second outer side wall 40c of the resin member 40 and the side wall portion 34, for example.

[0103] In addition, the elastic members 94 and 96 are not limited to being disposed in the circumferential concave portion without gaps, and gaps may be formed in at least one direction in the vertical direction.

[0104] The cooling material 120 is preferably a laminate formed by laminating fiber materials such as glass fiber, for example. A laminate formed by laminating glass wool is particularly preferred. That is, the cooling material 120 has a plurality of layers 121, and an interface is formed at the junction of the plurality of layers 121. In addition, in Figure 3 , each layer 121 is illustrated in such a way that the hatching lines of adjacent layers 121 are different from each other. In addition, the number of laminations of the cooling material 120 is not particularly limited.

[0105] As Figure 3 shown, the plurality of layers 121 are laminated along the X-axis direction, and the end faces 121a of the plurality of layers 121 are disposed so as to face the lower surface 60a of the pusher 60. In addition, the end face 121a forms an end face (upper end face) in a direction (in the Figure 3 example, the Z-axis positive direction) orthogonal to the lamination direction of the layer 121 (in the Figure 3 example, the X-axis direction) of the cooling material 120.

[0106] The cooling material 120 composed of the plurality of layers 121 does not easily allow the gas flowing along the lamination direction of the layer 121 (in the Figure 3 example, the X-axis direction) to pass through, and easily allows the gas flowing along the direction orthogonal to the lamination direction of the layer 121 (in the Figure 3 example, the Z-axis direction and the Y-axis direction) to pass through.

[0107] In addition, in the cutting device 1, during the cutting operation, the gas mainly flows from above to below (from the first position to the second position). Therefore, by arranging the cooling material 120 as shown Figure 3 like this, the high-temperature gas flowing downward generated during the cutting operation easily passes through the inside of the cooling material 120. As a result, since the temperature of the gas can be effectively decreased, the cooling effect of the cooling material 120 can be improved.

[0108] The cooling material 120 is arranged below the pusher 60, and is arranged in a compressed state in the space 70 in the initial state, and is in contact with the convex portion 30a, the resin member 40, the conductor 50, and the pusher 60. In addition, the cooling material 120 is provided with a concave portion or a through hole 122.

[0109] The cooling material 120 is configured to absorb the heat of the arc or gas by contacting the arc or gas generated during ignition, and cool the arc and gas. As a result, an increase in the pressure of the space 70 caused by the generation of the arc can be suppressed. The gas here is the gas that becomes high temperature due to the generation of the arc. In addition, the gas may also contain the gas generated by the igniter 10.

[0110] In addition, the cooling material 120 is not limited to being fibrous such as glass fiber, and may also be granular. For example, the cooling material 120 may also be configured to include a plurality of particles. The particles may be metal oxides such as alumina particles, or inorganic oxides such as silica.

[0111] In addition, an example in which the cooling material 120 is arranged at a position above the upper surface vicinity of the convex portion 30a has been described, but it may also be arranged at least partially at a position below the upper surface vicinity of the convex portion 30a. For example, the cooling material 120 may also be arranged at least partially in the annular space formed by the convex portion 30a, the bottom portion 33, and the side wall portion 34, which is below the upper surface vicinity of the convex portion 30a.

[0112] Here, further refer to Figure 4 to describe the structure of the cooling material 120. Figure 4 is a perspective view showing the cooling material 120 of the present embodiment. In addition, in Figure 4 for convenience, the illustration of the boundary of each layer 121 is omitted.

[0113] As shown in Figure 3 and Figure 4As shown, in the present embodiment, a through-hole 122 is provided in the cooling material 120. The through-hole 122 penetrates the cooling material 120 from the upper surface of the cooling material 120 toward the lower surface of the cooling material 120 (from the positive side of the Z axis toward the negative side of the Z axis). The through-hole 122 is, for example, a cylindrical through-hole, but the shape is not particularly limited.

[0114] The through-hole 122 is provided at a position that overlaps with the hole 51a of the separation portion 51 in a plan view. The through-hole 122 is formed, for example, concentrically with the hole 51a of the separation portion 51 in a plan view, and the diameter is larger than the diameter of the hole 51a. The cooling material 120 is located below the separation portion 51, and the width W2 of the opening of the through-hole 122 is larger than the width W1 of the separation portion 51. In addition, in a plan view, the through-hole 122 and the hole 51a only need to overlap at least partially.

[0115] In addition, the through-hole 122 is a part of the space 70. In addition, the width W1 is the length of the separation portion 51 in the X-axis direction. In addition, the width W1 is the dimension of the cooling material 120 in a state compressed by the convex portion 30a, the resin member 40, the conductor 50, and the pusher 60.

[0116] According to such a cooling material 120, compared with the case where the through-hole 122 is not formed, the surface area of the cooling material in contact with the gas can be increased. As a result, the heat of the arc or gas can be further absorbed, and the arc or gas can be further cooled. By providing the through-hole 122 in the cooling material 120 in this way, the cooling performance can be improved while suppressing the increase in the size and the number of components of the cutting device 1.

[0117] In addition, when the cutting device includes a resin member (for example, the resin member 40), there is a case where carbonized gas is generated from the resin member during the cutting operation. The carbonized gas adheres to the surface of the cooling material. As a result, the contact area between the arc or gas and the cooling material decreases, and thus the cooling performance of the cooling material deteriorates. On the other hand, in the present embodiment, since the through-hole 122 is formed in the cooling material 120 and the surface area of the cooling material 120 is large, the influence of the carbonized gas on the cooling performance can be alleviated. In addition, since the arc or the internal gas passes through the inside of the cooling material 120, the inside of the cooling material 120 can be effectively utilized. Therefore, the cooling performance of the cooling material 120 in the present embodiment can be improved compared with the prior art.

[0118] In addition, Figure 4 and Figure 6 the outer shape of the cooling material 120 shown is cylindrical, but it may be, as Figures 11A to 11CAs shown, the cooling material 320 has a quadrangular prism shape. The shape of the cooling material 320 can also be a triangular prism shape, a hexagonal prism shape, an elliptical cylinder shape, or other columnar shapes. When the shape of the cooling material 320 is other than a cylindrical shape, similarly to the above-described embodiment, through holes 322a and recesses 322b are formed in the cooling material 320.

[0119] In addition, a plurality of through holes 322a and a plurality of recesses 322b may be formed in the cooling material 320. The extending directions of the through holes 322a and the recesses 322b do not need to be in the left-right direction or the up-down direction, and may extend in an inclined direction.

[0120] [1-2. Manufacturing Method of Cutting Device]

[0121] Next, Figure 5 a manufacturing method of the cutting device 1 configured as described above will be described. Figure 5 FIG. is a flowchart showing the manufacturing process of the cutting device 1 of the present embodiment.

[0122] As Figure 5 shown, the upper housing 20 is manufactured by molding or the like (S10), and the lower housing 30 is manufactured by molding or the like (S20). In step S10, the protection part 80 is further provided on the upper housing 20. For example, the protection part 80 is fixed to the upper housing 20 by welding or the like. In addition, in step S20, the convex part 30a is formed simultaneously when the lower housing 30 is molded.

[0123] Next, the cooling material 120 is manufactured from a raw roll sheet for the cooling material (S30). The raw roll sheet is a large sheet as a laminate having a plurality of layers 121. In the raw roll sheet, the plurality of layers 121 are laminated in the thickness direction.

[0124] In step S30, the raw roll sheet is cut into a single piece having, for example, a rectangular shape or the like, and the through hole 122 is formed by punching the cut surface, which is a surface (side surface) formed by laminating a plurality of layers, with a die corresponding to the through hole 122.

[0125] In addition, the order of steps S10, S20, and S30 is not limited to this, and may be changed.

[0126] Next, the upper housing 20 and the lower housing 30 are fixed (S40). For example, in a state where the igniter 10, the resin member 40, the conductor 50, the pusher 60, the protection part 80, the elastic members 90, 92, 94, 96, and the cooling material 120 are housed inside, the upper housing 20 and the lower housing 30 are fixed by welding or the like. At this time, the cooling material 120 contacts the convex part 30a, the resin member 40, the conductor 50, and the pusher 60, and is arranged in the space 70 in a state of being compressed by these members. Thus, the above-described cutting device 1 is manufactured.

[0127] (Various Modification Examples of Embodiment 1)

[0128] In the above-described embodiment, Figure 4 a cooling material formed with a through-hole in the vertical direction has been described, but the cooling material is not limited to Figure 4 the shape shown. Hereinafter, various modification examples of the cooling material will be described with reference to Figures 6 to 9 . Figures 6 to 9 FIG. is a perspective view of a cooling material showing various modification examples of Embodiment 1. The cutting device of the modification example may also include any one of the cooling materials in the various modification examples instead of the cooling material 120 of Embodiment 1.

[0129] In addition, Figures 6 to 9 FIG. is a perspective view of the cooling material arranged inside the housing. In addition, in Figures 6 to 9 , the illustration of the plurality of layers 121 is omitted. In addition, Figure 6 , Figure 8 and Figure 9 the depth and shape of the concave portion shown, and Figure 7 the shape of the through-hole shown are not particularly limited as long as gas can flow in.

[0130] As shown in Figure 6 , the cutting device may also include a cooling material 120a provided with a concave portion 122a. The concave portion 122a opens upward (the positive Z-axis side) and is provided to face the lower surface 60a of the pusher 60. The width W3 of the opening of the concave portion 122a is, for example, larger than the width W1 of the separation portion 51.

[0131] In addition, as shown in Figure 7 , the cutting device may also include a cooling material 120b provided with a through-hole 122b penetrating the side surface. The through-hole 122b is provided in a direction orthogonal to the moving direction (vertical direction) of the pusher 60.

[0132] In addition, as shown in Figure 8 , the cutting device may also include a cooling material 120c provided with a concave portion 122c on the side surface. The concave portion 122c is provided to open laterally (a direction orthogonal to the Z-axis).

[0133] In addition, as Figure 9 shown, the cutting device may also include a cooling material 120d having a plurality of recesses 122d on its upper surface. The recess 122d constitutes one of the plurality of recesses 122d.

[0134] Furthermore, in Figure 9 , an example is shown in which the cooling material 120d has five recesses 122d. However, the number of recesses 122d provided in the cooling material 120d is not limited to five, and may be two or more. In addition, the shapes (e.g., top views) and depths of the plurality of recesses 122d may be the same or different from each other. In addition, the plurality of recesses 122d may be provided on the side surface of the cooling material 120d.

[0135] Furthermore, the cooling material 120d may have a plurality of through holes instead of the plurality of recesses 122d. The through hole constitutes one of the plurality of through holes.

[0136] As described above, even when using the cooling materials of various modified examples, compared with the case where no recesses or through holes are formed, the surface area of the cooling material can be increased, and thus a cutting device capable of improving the cooling performance compared with the prior art can be realized.

[0137] (Embodiment 2)

[0138] Hereinafter, the cutting device of the present embodiment will be described with reference to Figure 10 . In addition, hereinafter, the description will focus on the differences from Embodiment 1, and the description of the same or similar contents as those in Embodiment 1 will be omitted or simplified.

[0139] Figure 10 is a cross-sectional view obtained by cutting the cutting device 2 of the present embodiment along the XZ plane.

[0140] As Figure 10 shown, the cutting device 2 of the present embodiment includes a cooling material 220 instead of the cooling material 120 of the cutting device 1 in Embodiment 1. The cooling material 220 is mainly different from the cooling materials described in Embodiment 1 and its modified examples in that no recesses or through holes are formed.

[0141] The cooling material 220 is configured such that a plurality of layers 221 are stacked in the X-axis direction, and the end surfaces 221a of the plurality of layers 221 face the lower surface 60a of the pusher 60. The cooling material 220 is also provided at a position that overlaps with the separation portion 51 in a top view. The cooling material 220 is also provided at a position that overlaps with the separation portion 51 and the hole 51a in a top view. For example, the cooling material 220 is provided at a position that overlaps with the pusher 60 in a top view. In addition, the material of the layer 221 is the same as that in Embodiment 1.

[0142] The cooling material 220 is arranged to fill without gaps the space above the upper surface of the convex portion 30a and below the lower surface 60a of the pusher 60 or the lower surface of the separating portion 51. In other words, the cooling material 220 is not provided with recesses or through holes. The non - provision here means that when manufacturing the cooling material 220, recesses or through holes are purposefully not provided, excluding cases where, for example, recesses are formed due to other components in a state where it is compressed and arranged in the housing.

[0143] In this way, since the stacking direction of the plurality of layers 221 is orthogonal to the moving direction of the pusher 60, that is, the boundary between adjacent layers in the plurality of layers 221 is parallel to the moving direction of the pusher 60, it is possible to improve the cooling performance of the cooling material 220 without forming recesses or through holes in the cooling material.

[0144] (Other embodiments)

[0145] As described above, the cutting device of one or more modes has been described based on each embodiment and the like, but the present disclosure is not limited to each of these embodiments and the like. As long as it does not deviate from the gist of the present disclosure, modes obtained by various modifications of the present embodiment conceived by those skilled in the art and modes constructed by combining components in different embodiments can also be included in the present disclosure.

[0146] For example, in each of the above - described embodiments and the like, an example where the housing is made of metal has been described, but it is not limited thereto. For example, the lower housing of the housing may be made of a resin having deformation characteristics.

[0147] In addition, in each of the above - described embodiments, the recess or the through hole is provided to extend in a straight line, but the shape of the recess or the through hole is not limited to extending in a straight line, and may extend in a wavy shape, in an L - shape, etc.

[0148] In addition, the order of each process in the manufacturing method of the cutting device described in each of the above - described embodiments and the like can also be changed. In addition, each process in the manufacturing method of the cutting device described in the above - described embodiment can be implemented in one process or in different processes. In addition, implementing in one process is intended to include cases where each process is implemented using one device, each process is continuously implemented, or each process is implemented at the same place. In addition, different processes are intended to include cases where each process is implemented using different devices, each process is implemented at different times (for example, different dates), or each process is implemented at different places.

[0149] Industrial applicability

[0150] The present disclosure is useful for a cutting device arranged in a circuit or the like.

[0151] Description of Reference Numerals

[0152] 1, 2: Cutting device; 10: Igniter; 11: Cover portion; 20: Upper housing; 20a: First main body portion; 21: Small-diameter portion; 22: Connecting portion; 23: Large-diameter portion; 24: First fixing portion; 30: Lower housing; 30a: Protrusion; 30b: Second main body portion; 33: Bottom; 34: Side wall portion; 35: Second fixing portion; 40: Resin member; 40a: Inner side wall; 40b: First outer side wall; 40c: Second outer side wall; 41: Embedded portion; 42, 81: First cylindrical portion; 43, 82: Second cylindrical portion; 50: Conductor; 51: Separation portion; 51a: Hole; 52: Holding portion; 60: Pusher; 60a: Lower surface; 60b: Outer side wall; 61: Recess; 62: First portion; 63: Second portion; 70: Space; 80: Protection portion; 83: Flange portion; 90, 92, 94, 96: Elastic member; 100: Fixing member; 110: Welding portion; 120, 120a, 120b, 120c, 120d, 220, 320: Cooling material; 121, 221: Layer; 121a, 221a: End face; 122, 122b, 322a: Through hole; 122a, 122c, 122d, 322b: Recess; W1, W2, W3: Width.

Claims

1. A cutting device, wherein, the cutting device includes: a housing; an igniter disposed within the housing; a conductor having a separation portion disposed below the igniter; a pusher disposed at a first position between the separation portion and the igniter, capable of breaking the separation portion from the first position and moving toward a second position located below the first position; and a cooling material disposed below the pusher, provided with a recess or a through hole.

2. The cutting device according to claim 1, wherein, the cooling material is provided with a plurality of recesses or a plurality of through holes, the recess is one of the plurality of recesses, the through hole is one of the plurality of through holes.

3. The cutting device according to claim 1 or 2, wherein, a hole penetrating the separation portion is provided in the separation portion, the recess of the cooling material or the through hole of the cooling material overlaps with the hole of the separation portion in a top view.

4. The cutting device according to any one of claims 1 to 3, wherein, the cooling material is provided with the recess, the recess opens upward and faces the lower surface of the pusher.

5. The cutting device according to any one of claims 1 to 3, wherein, the cooling material is provided with the through hole, the through hole penetrates the cooling material from the upper surface to the lower surface of the cooling material.

6. The cutting device according to any one of claims 1 to 5, wherein, the cooling material is located below the separation portion, the width of the opening of the recess or the width of the opening of the through hole is larger than the width of the separation portion.

7. The cutting device according to any one of claims 1 to 6, wherein, the cooling material is formed by laminating a plurality of layers, and is arranged such that the end faces of the plurality of layers face the lower surface of the pusher.

8. The cutting device according to claim 1 or 2, wherein, the recess of the cooling material is provided on the side surface of the cooling material, or the through hole penetrates the side surface of the cooling material.

9. A cutting device, wherein, the cutting device includes: a housing; an igniter disposed within the housing; a conductor having a separation portion disposed below the igniter; a pusher disposed at a first position between the separation portion and the igniter, capable of breaking the separation portion from the first position and moving toward a second position located below the first position; and a cooling material disposed below the pusher, the cooling material is formed by laminating a plurality of layers, and is arranged such that the end faces of the plurality of layers face the lower surface of the pusher.

10. The cutting device according to any one of claims 1 to 9, wherein, the cooling material is a fiber material.

11. The cutting device according to claim 10, wherein, the fiber material is glass fiber.

12. The cutting device according to any one of claims 1 to 11, wherein, the outer shape of the cooling material is cylindrical.

13. The cutting device according to any one of claims 1 to 11, wherein the cooling material has a prismatic shape.

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