Cutting device

Abstract

The purpose of the present disclosure is to improve current cutoff performance. A circuit interrupting device (100) is provided with: a first fixed terminal (1) having a first fixed contact (11); a movable contact (3) having a first movable contact point (31), the movable contact (3) being formed independently of the first fixed terminal (1); a holding part (4) that holds the movable contact (3) such that the first movable contact (31) and the first fixed contact (11) are connected; and an igniter (51) that generates gas by combustion. In a circuit interrupting device (100), a movable contact (3) moves in a direction away from a first fixed terminal (1) in conjunction with the pressure of gas generated by an igniter (51), and a first movable contact (31) is pulled away from a first fixed contact (11).

Description

[0001] This application is a divisional application of an application with an international application date of March 5, 2019 (date of entry into the Chinese national phase: September 17, 2020), an international application number of PCT / JP2019 / 008509 (national application number: 201980019981.5), and an invention name of “Circuit Cutting Device”. Technical Field

[0002] The present disclosure generally relates to a circuit disconnecting device, and more particularly to a circuit disconnecting device that disconnects a circuit in conjunction with gas generated by combustion. Background Art

[0003] Patent Document 1 discloses a circuit breaker which is intended to be mounted on an automobile, particularly an electric vehicle, and includes a pyrotechnic actuator.

[0004] The circuit breaker of Patent Document 1 includes a conductor, a housing, an impact die, a punch, and a pyrotechnic actuator.

[0005] The conductor traverses part of the housing, and the ends of the conductor form two connection terminals for the circuit breaker. The impact die and the punch are arranged on both sides (upper and lower sides) of the conductor.

[0006] The pyrotechnic actuator moves the punch from the first position to the second position when ignited. The punch and the impact die break (split) the conductor and separate it into three separate parts when the punch moves from the first position to the second position. The punch has a groove, and when the punch is in the second position, the groove of the punch engages with the impact die.

[0007] In the circuit breaker described in Patent Document 1, the energy generated by the pyrotechnic actuator is used to break the conductor and cut off the circuit. Therefore, in this circuit breaker, it takes time to cut off the circuit, and the gap distance between the high-voltage side circuit and the low-voltage side circuit in the broken circuit cannot be set larger, so the improvement of the current cutting performance is limited.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application No. 2017-507469 Summary of the invention

[0011] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a circuit interruption device capable of improving current interruption performance.

[0012] A circuit disconnecting device of a technical solution of the present disclosure includes a fixed terminal, a movable contact, a holding portion, and an igniter. The fixed terminal has a fixed contact. The movable contact has a movable contact. The movable contact is formed independently of the fixed terminal. The holding portion holds the movable contact in a manner that connects the movable contact to the fixed contact. The igniter generates gas by combustion. In the circuit disconnecting device, the movable contact moves in a direction away from the fixed terminal in conjunction with the pressure of the gas generated by the igniter, thereby pulling the movable contact away from the fixed contact.

[0013] A circuit disconnecting device of a technical solution of the present disclosure includes a fixed terminal, a movable contact, an igniter, and a storage chamber. The fixed terminal has a fixed contact. The movable contact is formed independently of the fixed terminal. The movable contact has a movable contact connected to the fixed contact. The igniter generates gas by combustion. The storage chamber is used to store the fixed contact and the movable contact. In the circuit disconnecting device, the movable contact moves in the storage chamber in a direction away from the fixed terminal in conjunction with the pressure of the gas generated by the igniter, thereby pulling the movable contact away from the fixed contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the circuit disconnecting device according to the embodiment of the present disclosure.

[0015] Figure 2 It is a perspective view of the main parts of the above-mentioned circuit disconnecting device.

[0016] Figure 3 The circuit disconnecting device Figure 1 Cross-sectional view in orthogonal direction.

[0017] Figure 4 is a cross-sectional view of a pyrotechnic actuator included in the circuit disconnecting device.

[0018] Figure 5 This is a circuit diagram for explaining a power supply system including the above-mentioned circuit disconnecting device.

[0019] Figure 6 It is a cross-sectional view of the circuit disconnecting device during operation.

[0020] Figure 7 It is a cross-sectional view of the circuit disconnecting device after operation.

[0021] Figure 8 It is a cross-sectional view of a pyrotechnic actuator included in the circuit disconnecting device of Modification 1.

[0022] Fig. 9A is a partially cutaway side view of the circuit disconnecting device of Modification Example 2 before operation. Fig. 9 B is a partially cutaway side view of the circuit disconnecting device of Modification Example 1 after operation.

[0023] Fig.10 This is an exploded perspective view of the main parts of the circuit disconnecting device according to the third modification.

[0024] Fig.11 It is a cross-sectional view of the main part of the circuit disconnecting device according to the fourth modification.

[0025] Fig.12 It is a cross-sectional view of the main part of the circuit disconnecting device according to the fifth modification.

[0026] Fig.13 It is a cross-sectional view of the main part of the circuit disconnecting device according to the sixth modification.

[0027] Fig.14 It is a cross-sectional view of the main part of the circuit disconnecting device of Modification 7.

[0028] Fig.15 A is a cross-sectional view of a main part of the circuit disconnecting device of Modification 8. Fig.15 B is the main part of the circuit disconnection device of Modification Example 8, and Fig.15 A cross-sectional view in a direction orthogonal to A.

[0029] Fig.16 It is a cross-sectional view of the main part of the circuit disconnecting device of Modification Example 9.

[0030] Fig.17 A is a perspective view of a circuit disconnecting device according to modification example 10. Fig.17 B is a front view of the circuit disconnecting device of modification example 10.

[0031] Fig.18 It is a cross-sectional view of the main part of the circuit disconnecting device according to Modification 11.

[0032] Fig.19 It is a cross-sectional view of the main part of the circuit disconnecting device of Modification 12.

[0033] Fig. 20 This is a circuit diagram of the main part of the circuit disconnecting device of Modification 13 and Modification 14.

[0034] Fig.21 It is a perspective view of the main part of the circuit disconnecting device of Modification 13.

[0035] Fig. 22 A is a top view of the main part of the circuit disconnecting device of Modification 13. Fig. 22 B is Fig. 22X1-X1 cross-sectional view of A.

[0036] Fig.23 A is a top view of the main part of the circuit disconnecting device of Modification 14. Fig.23 B is Fig.23 X2-X2 cross-sectional view of A.

[0037] Fig.24 A. Fig.24 B are plan views of the main parts of the circuit disconnecting device of Modification 15.

[0038] Fig.25 A. Fig.25 B are bottom views of the main parts of the circuit disconnecting device of Modification 16.

[0039] Fig.26 A is a front view of the movable contact of the circuit disconnecting device of Modification Example 17. Fig.26 B is a cross-sectional view of the main part of the circuit disconnecting device of Modification 15.

[0040] Fig. 27 A is a front view of the movable contact of the circuit disconnecting device of Modification Example 18. Fig. 27 B is a cross-sectional view of the main part of the circuit disconnecting device of Modification 16.

[0041] Fig.28 A is a cross-sectional view of the main part of the circuit disconnecting device of Modification 19 as viewed from above. Fig.28 B is a cross-sectional view of the main part of the circuit disconnecting device of Modification 19 as viewed from the side. Fig.28 C is a three-dimensional view of the piston of the circuit disconnecting device of Modification 19.

[0042] Fig.29 This is a cross-sectional view of the main part of the circuit disconnecting device after operation, as seen from the side.

[0043] Fig.30 A is a cross-sectional view of a main part of the circuit disconnecting device of Modification 20 as viewed from above. Fig.30 B is a cross-sectional view of the main part of the circuit disconnecting device of Modification 20 as viewed from the side. Fig.30 C is a three-dimensional view of the piston of the circuit disconnecting device of Modification 20.

[0044] Fig.31 This is a cross-sectional view of the main part of the circuit disconnecting device after operation, as seen from the side.

[0045] Fig.32 A is a cross-sectional view of the main part of the circuit disconnecting device of Modification 21 as viewed from above. Fig.32 B is a cross-sectional view of the main part of the circuit disconnecting device of Modification 21 as viewed from the side.

[0046] Fig.33 This is a cross-sectional view of the main part of the circuit disconnecting device after operation, as seen from the side.

[0047] Fig.34 This is a perspective view of a circuit disconnecting device according to Modification 22.

[0048] Fig.35 This is a diagram for explaining how to lengthen the arc generated by the circuit interrupting device of Modification 22.

[0049] Fig.36 This is a perspective view of a circuit disconnecting device according to Modification 23.

[0050] Fig.37 It is a cross-sectional view of a circuit disconnecting device according to Modification 24.

[0051] Fig.38 A is a three-dimensional view of the main part of the circuit disconnecting device of Modification Example 25. Fig.38 B is a top view of the main part of the circuit disconnecting device of Modification Example 25.

[0052] Fig.39 It is a cross-sectional view of a circuit disconnecting device according to Modification 26.

[0053] Fig.40 It is a cross-sectional view of the main part of the circuit disconnecting device of Modification 27.

[0054] Fig.41 This is a cross-sectional view of the main part of the circuit disconnecting device of Modification 28.

[0055] Fig.42 This is a cross-sectional view of the main parts of the circuit disconnecting device of Modification 29. DETAILED DESCRIPTION

[0056] The embodiments and variations described below are merely examples of the present disclosure. The present disclosure is not limited to the embodiments and variations, and various changes can be made according to the design, etc., even outside the embodiments and variations, as long as they do not deviate from the technical concept of the present disclosure. In addition, the figures described in the following embodiments and variations are schematic figures, and the size and thickness ratios of the structural elements in the figures do not necessarily reflect the actual size ratios.

[0057] (1) Implementation Method

[0058] use Figure 1 to Figure 7 The circuit disconnecting device 100 according to the embodiment will be described.

[0059] (1.1) Summary

[0060] like Figure 1 As shown, the circuit disconnecting device 100 of the embodiment includes a first fixed terminal (fixed terminal) 1 , a second fixed terminal 2 , a movable contact (movable terminal) 3 , a holding portion 4 , a pyrotechnic actuator 5 , and a storage chamber 70 .

[0061] The first fixed terminal 1 has a first fixed contact (fixed contact) 11. The first fixed terminal 1 has a first electrode 12 connected to a first end of an electric circuit.

[0062] The second fixed terminal 2 has a second fixed contact 21. The second fixed terminal 2 is formed independently of the first fixed terminal 1. The second fixed terminal 2 has a second electrode 22 connected to a second end of the electric circuit.

[0063] The movable contact 3 has a first movable contact (movable contact) 31. The first movable contact 31 is connected to the first fixed contact 11. The movable contact 3 has a second movable contact 32. The second movable contact 32 is connected to the second fixed contact 21. The movable contact 3 is formed independently of the first fixed terminal 1 and the second fixed terminal 2.

[0064] The first fixed contact 11 , the second fixed contact 21 , and the movable contact 3 (the first movable contact 31 and the second movable contact 32 ) are accommodated in the accommodation chamber 70 .

[0065] The holding portion 4 holds the movable contact 3 in such a manner that the first movable contact 31 is connected to the first fixed contact 11 and the second movable contact 32 is connected to the second fixed contact 21. The holding portion 4 holds the movable contact 3 in such a manner that the first movable contact 31 is connected to the first fixed contact 11 and the second movable contact 32 is connected to the second fixed contact 21, particularly when no current flows through the movable contact 3 (when power is not supplied).

[0066] like Figure 4 As shown, the pyrotechnic actuator 5 includes an igniter 51 , a pressurizing chamber 520 and a piston 53 .

[0067] The squib 51 generates gas by burning. The squib 51 includes a heating element and gunpowder (fuel). When an electrical signal flows through the heating element to heat the heating element, the gunpowder ignites. When the squib 51 is ignited, the gunpowder burns and generates gas. The gas generated by the squib 51 is introduced into the pressurized chamber 520 to increase the pressure in the pressurized chamber 520.

[0068] The piston 53 moves by receiving the pressure in the pressurized chamber 520 at the first end 531, and applies a force in a direction away from the fixed terminal (first fixed terminal) 1 to the movable contact 3 (directly or indirectly) at the second end 532, thereby moving the movable contact 3. More specifically, the piston 53 receives the pressure in the pressurized chamber 520 at the first end 531, is pressed by the rising pressure in the pressurized chamber 520, and presses the movable contact 3 at the second end 532. The piston 53 is subjected to a large pressure in the pressurized chamber 520, and presses the movable contact 3 at a high speed.

[0069] The movable contact 3 is pressed by the piston 53 and moves in the storage chamber 70. The movable contact 3 is pressed by the piston 53, as shown in FIG. Figure 6 , Figure 7 As shown, the first movable contact 31 is pulled away from the first fixed contact 11 , and the second movable contact 32 is pulled away from the second fixed contact 21 .

[0070] That is, in the circuit disconnecting device 100, the movable contact 3 moves away from the fixed terminal 1 in conjunction with the pressure of the gas generated by the igniter 51, thereby pulling the movable contact (first movable contact) 31 away from the fixed contact (first fixed contact) 11. As a result, the circuit between the first electrode 12 and the second electrode 22 is disconnected.

[0071] As described above, in the circuit disconnection device 100, the energy of the gas generated by the igniter 51 is used to move (pull apart) the movable contact 3 at a high speed relative to the fixed terminal (first fixed terminal) 1, thereby disconnecting the circuit. As a result, the arc generated between the contacts is quickly elongated to a longer distance equal to the amount of movement of the movable contact 3 and is extinguished. As a result, the circuit disconnection device 100 can extinguish the arc in a short time, and can improve the current disconnection performance. Moreover, the arc generated between the contacts is elongated to an amount corresponding to the moving distance of the movable contact 3 in the storage chamber 70 and is extinguished. As a result, the circuit disconnection device 100 can elongate the arc to extinguish it, and can improve the current disconnection performance.

[0072] (1.2) Details

[0073] Below, use Figure 1 to Figure 7 The circuit disconnecting device 100 according to the present embodiment will be described in detail.

[0074] (1.2.1) Power supply system

[0075] like Figure 5 As shown, the circuit interruption device 100 of the present embodiment is used as a fuse of a power supply system 200, for example.

[0076] The power supply system 200 is mounted on a vehicle 300 such as an electric vehicle, and drives a motor 3002 connected via an inverter 3001 to drive the vehicle 300. In the vehicle 300, Figure 5 As shown, the pre-charge container 3003 is connected in parallel with the inverter 3001.

[0077] Inverter 3001 converts DC power supplied from power supply system 200 into AC power during power operation and supplies it to motor 3002 during regeneration. Motor 3002 is, for example, a three-phase AC synchronous motor.

[0078] The power supply system 200 includes a battery 201 , a first main relay 202 , a second main relay 203 , a pre-charge resistor 204 , a pre-charge relay 205 , a current sensor (shunt resistor) 206 , and a control circuit 207 in addition to the circuit interruption device 100 .

[0079] The battery 201 includes a plurality of battery cells connected in series. Examples of the battery cells include nickel-metal hydride battery cells and lithium-ion battery cells.

[0080] The first main relay 202 has a first end connected to the positive electrode of the battery 201 , and a second end connected to a first input terminal (high potential side input terminal) of the inverter 3001 .

[0081] The second main relay 203 has a first end connected to the negative electrode of the battery 201 via the current sensor 206 and the circuit interruption device 100 , and a second end connected to the second input terminal (low potential side input terminal) of the inverter 3001 .

[0082] A series circuit of the pre-charge resistor 204 and the pre-charge relay 205 is connected in parallel with the first main relay 202 .

[0083] The control circuit 207 is used to control the operations of the first main relay 202 , the second main relay 203 , the pre-charge relay 205 , and the circuit disconnecting device 100 .

[0084] When the control circuit 207 starts to supply power to the motor 3002, the pre-charge relay 205 and the second main relay 203 are closed to charge the pre-charge container 3003. This suppresses the inrush current from flowing into the motor 3002. After the pre-charge container 3003 is charged, the control circuit 207 opens the pre-charge relay 205 and closes the first main relay 202 to start supplying power from the power supply system 200.

[0085] In addition, the control circuit 207 detects the occurrence of an abnormality in the circuit including the power supply system 200 based on the current detected by the current sensor 206. When an abnormality occurs in the circuit including the power supply system 200, the control circuit 207 actuates (starts) at least one of the first main relay 202, the second main relay 203, and the circuit disconnecting device 100 to disconnect the circuit.

[0086] For example, when the magnitude of the current detected by the current sensor 206 exceeds the first threshold value for a first time, the control circuit 207 disconnects at least one of the first main relay 202 and the second main relay 203. Thus, the circuit is cut off. In this case, when the disconnected relays (the first main relay 202 and the second main relay 203) are closed again by the control circuit 207, the circuit is formed again, and the power supply from the power supply system 200 to the motor 3002 starts again.

[0087] On the other hand, for example, when the magnitude of the current detected by the current sensor 206 exceeds the second threshold value (> the first threshold value) for a second time, the control circuit 207 actuates the circuit disconnection device 100. Thus, the circuit is disconnected. The circuit disconnection device 100 is a disconnection device for disconnecting the circuit of the circuit. The circuit disconnection device 100 keeps the circuit disconnected when it is actuated (activated), so after the circuit disconnection device 100 is activated, the power supply from the power supply system 200 to the motor 3002 is stopped. Therefore, when an accident occurs in the vehicle 300, for example, by actuating the circuit disconnection device 100, the power supply system 200 can be disconnected.

[0088] (1.2.2) Structure

[0089] Next, refer to Figure 1 to Figure 4 The structure of the circuit disconnecting device 100 will be described.

[0090] As described above, the circuit disconnecting device 100 includes the first fixed terminal 1, the second fixed terminal 2, the movable contact 3, the holding portion 4, and the pyrotechnic actuator 5. Figure 1 As shown, the circuit disconnecting device 100 further includes a first yoke (lower yoke) 61 , a second yoke (upper yoke) 62 , and a housing 7 having a storage chamber 70 .

[0091] The movable contact 3 of this embodiment is a plate-shaped member made of a conductive metal material, and is formed to be long in one direction. The movable contact 3 has a first movable contact 31 at the first end in the length direction, and has a second movable contact 32 at the second end. The first fixed terminal 1 and the second fixed terminal 2 are arranged in a row along the length direction of the movable contact 3. The first fixed terminal 1 has a first fixed contact 11 at a position opposite to the first movable contact 31 of the movable contact 3, and the second fixed terminal 2 has a second fixed contact 21 at a position opposite to the second movable contact 32 of the movable contact 3.

[0092] In the following, for convenience of description, the relative direction between the first fixed contact 11 and the first movable contact 31 (the relative direction between the second fixed contact 21 and the second movable contact 32; Figure 1 The vertical direction is defined as the vertical direction, and when viewed from the first movable contact 31, the first fixed contact 11 side is the upper side. In addition, the direction in which the first fixed terminal 1 and the second fixed terminal 2 are arranged ( Figure 1 The left-right direction is defined as the left-right direction, and when viewed from the first fixed terminal 1, the second fixed terminal 2 side is the right side. That is, Figure 1 In addition, the directions orthogonal to the up-down direction and the left-right direction (directions orthogonal to the up-down direction and the left-right direction) are described below. Figure 1 However, the purpose of these directions is not to limit the use of the circuit disconnecting device 100.

[0093] The first fixed terminal 1 and the second fixed terminal 2 are arranged side by side in the left-right direction (see Figure 1 ). The first fixed terminal 1 and the second fixed terminal 2 are respectively made of a conductive metal material. The first fixed terminal 1 and the second fixed terminal 2 function as terminals for connecting an external electrical circuit (a circuit constituting the above-mentioned power supply system 200) to the first fixed contact 11 and the second fixed contact 21. In the present embodiment, as an example, the first fixed terminal 1 and the second fixed terminal 2 are respectively formed of copper (Cu). However, this is not limited to this, and the first fixed terminal 1 and the second fixed terminal 2 can also be respectively formed of a conductive material other than copper.

[0094] like Figure 2 As shown, the first fixed terminal 1 integrally includes a connection sheet 110 , an electrode sheet 120 , a coupling sheet 130 , and a circuit sheet 140 .

[0095] The connecting piece 110 is a rectangular plate having thickness in the vertical direction and being long in the front-back direction. In the present embodiment, the lower surface of the connecting piece 110 functions as the first fixed contact 11, but the present invention is not limited thereto. The first fixed contact 11 may also be formed of a member independent of the connecting piece 110 and fixed to the connecting piece 110 by welding or the like.

[0096] The electrode sheet 120 is a plate having a thickness in the front-to-back direction. The electrode sheet 120 is square-shaped and has a through hole in the center. The electrode sheet 120 is connected to the first end of the external electrical circuit. In other words, the electrode sheet 120 functions as the first electrode 12 connected to the first end of the external electrical circuit.

[0097] The connecting piece 130 is in the shape of a rectangular plate having a thickness in the left-right direction and being long in the up-down direction. The lower side of the connecting piece 130 is connected to the left side of the connecting piece 110 .

[0098] The circuit sheet 140 is a plate having thickness in the front-back direction. The circuit sheet 140 connects the electrode sheet 120 and the connecting sheet 130. The left side of the circuit sheet 140 is connected to the upper part of the right side of the electrode sheet 120. The right side of the circuit sheet 140 is connected to the center of the left surface of the connecting sheet 130.

[0099] like Figure 2 As shown, the second fixed terminal 2 integrally includes a connection piece 210 , an electrode piece 220 , a coupling piece 230 , and a circuit piece 240 .

[0100] The connecting piece 210 is a rectangular plate having thickness in the vertical direction and being long in the front-back direction. In the present embodiment, the lower surface of the connecting piece 210 functions as the second fixed contact 21, but the present invention is not limited thereto. The second fixed contact 21 may also be formed of a member independent of the connecting piece 210 and fixed to the connecting piece 210 by welding or the like.

[0101] The electrode sheet 220 is a plate having a thickness in the front-to-back direction. The electrode sheet 220 is square-shaped and has a through hole in the center. The electrode sheet 220 is connected to the second end of the external electrical circuit. In other words, the electrode sheet 220 functions as the second electrode 22 connected to the second end of the external electrical circuit.

[0102] The connecting piece 230 is in the shape of a rectangular plate having a thickness in the left-right direction and being long in the up-down direction. The lower side of the connecting piece 230 is connected to the right side of the connecting piece 210 .

[0103] The circuit sheet 240 is a plate having thickness in the front-to-back direction. The circuit sheet 240 connects the electrode sheet 220 and the connecting sheet 230. The right side of the circuit sheet 240 is connected to the upper part of the left side of the electrode sheet 220. The left side of the circuit sheet 240 is connected to the center of the right surface of the connecting sheet 230.

[0104] like Figure 1 As shown, the first fixed terminal 1 is fixed to the housing 7 in a state where the electrode sheet 120 is exposed to the outside from the left wall of the housing 7, and the lower end of the connecting sheet 130 and the connecting sheet 110 are stored in the internal space (storage chamber 70) of the housing 7. The second fixed terminal 2 is fixed to the housing 7 in a state where the electrode sheet 220 is exposed to the outside from the right wall of the housing 7, and the lower end of the connecting sheet 230 and the connecting sheet 210 are stored in the internal space (storage chamber 70) of the housing 7.

[0105] like Figure 1 to Figure 3 As shown in FIG. 1 , the movable contact 3 is formed into a plate shape having thickness in the vertical direction and being longer in the left-right direction than in the front-back direction. The movable contact 3 is arranged below the connecting piece 110 and the connecting piece 210 in such a manner that both ends in the longitudinal direction (left-right direction) of the movable contact 3 are opposite to (connected to) the first fixed contact 11 and the second fixed contact 21 (see FIG. 1 ). Figure 1 The movable contact 3 has a first movable contact 31 at a position facing the first fixed contact 11, and a second movable contact 32 at a position facing the second fixed contact 21 (see Figure 1 ).

[0106] In this embodiment, the first movable contact 31 is in contact with the first fixed contact 11. More specifically, the first movable contact 31 is in surface contact with the first fixed contact 11. In addition, the second movable contact 32 is in contact with the second fixed contact 21. More specifically, the second movable contact 32 is in surface contact with the second fixed contact 21.

[0107] In the present embodiment, the first movable contact 31 is a member independent of the movable contact 3, is made of silver (Ag), and is fixed to the movable contact 3 by welding or the like. Similarly, the second movable contact 32 is a member independent of the movable contact 3, is made of silver (Ag), and is fixed to the movable contact 3 by welding or the like. However, the present invention is not limited thereto, and the first movable contact 31 and the second movable contact 32 may be formed integrally with the movable contact 3 by punching out a part of the movable contact 3 or the like.

[0108] like Figure 1 As shown, the movable contact 3 is accommodated in the internal space (accommodation chamber 70 ) of the housing 7 . The movable contact 3 is held by the holding portion 4 so that the first movable contact 31 is connected to the first fixed contact 11 , and the second movable contact 32 is connected to the second fixed contact 21 .

[0109] The first fixed terminal 1 and the second fixed terminal 2 are short-circuited via the movable contact 3. That is, the first electrode 12 of the first fixed terminal 1 is electrically connected to the second electrode 22 of the second fixed terminal 2 via the first fixed contact 11, the first movable contact 31, the movable contact 3, the second movable contact 32, and the second fixed contact 21 (see Figure 2 ). Therefore, if the first electrode 12 is electrically connected to the first end of the electrical circuit and the second electrode 22 is electrically connected to the second end of the electrical circuit, the circuit disconnecting device 100 forms a circuit between the first electrode 12 and the second electrode 22.

[0110] like Figure 1 , Figure 3 As shown, the housing 7 includes an inner cylinder 71 , an outer cylinder 72 and a cover member 73 .

[0111] The inner cylinder 71 is formed of a material having electrical insulation properties, such as a resin material. The inner cylinder 71 is formed into a bottomed cylindrical shape with a closed lower surface and an open upper surface. A cylindrical retaining rib 711 is provided on the upper surface of the lower wall of the inner cylinder 71 (the bottom surface of the inner cylinder 71). The retaining rib 711 is formed to be concentric with the inner cylinder 71.

[0112] The outer cylinder 72 is formed of, for example, a metal material. The outer cylinder 72 is preferably formed of a non-magnetic metal material. The non-magnetic metal material is, for example, austenitic stainless steel such as SUS304. However, the material of the outer cylinder 72 may not be non-magnetic, and may be, for example, an alloy having iron as a main component such as 42 alloy.

[0113] The outer cylinder 72 is formed concentrically with the inner cylinder 71 and is a bottomed cylindrical shape with a closed lower surface and an open upper surface. The outer cylinder 72 is provided in a manner covering the periphery of the inner cylinder 71. In other words, the outer cylinder 72 is a strength member that improves the strength of the outer shell 7 (the strength of the outer wall of the storage chamber 70).

[0114] In addition, the inner cylinder 71 may be formed integrally with the outer cylinder 72 by, for example, insert molding, etc. In addition, the outer housing 7 may not include the outer cylinder 72.

[0115] The cover member 73 is made of an electrically insulating material, such as a resin material. The cover member 73 is formed into a bottomed cylindrical shape with a closed upper surface and an opening at the lower surface. The cover member 73 is formed integrally with the first fixed terminal 1 and the second fixed terminal 2 by, for example, insert molding.

[0116] The thickness of the upper wall of the cover member 73 is thicker than the thickness of the side wall of the cover member 73. A through hole 731 is formed at the center of the upper wall of the cover member 73, which is concentric with the cover member 73. The pyrotechnic actuator 5 is arranged in the through hole 731 of the cover member 73. The lower end of the pyrotechnic actuator 5 protrudes from the lower surface (inner surface) of the upper wall of the cover member 73. The through hole 731 is airtightly closed by the pyrotechnic actuator 5 (housing 52 thereof).

[0117] An annular groove 732 is formed on the lower surface of the side wall of the cover member 73. By inserting the upper edges of the inner cylinder 71 and the outer cylinder 72 into the groove 732, the inner cylinder 71 and the outer cylinder 72 are combined with the cover member 73. Thus, the housing 7 has an airtight internal space (storage chamber 70) surrounded by the inner cylinder 71 and the cover member 73. The first fixed contact 11, the second fixed contact 21 and the movable contact 3 are stored in the internal space (storage chamber 70) of the housing 7. A gas with arc extinguishing properties such as hydrogen may also be sealed in the storage chamber 70.

[0118] In the present embodiment, the shape of the housing 7 is a generally cylindrical shape having an internal space (storage chamber 70), but is not limited thereto. The housing 7 may be a shape having an internal space (storage chamber 70) for storing the first fixed contact 11, the second fixed contact 21, and the movable contact 3, or may be other shapes such as a hollow polygonal column (e.g., a hollow rectangular parallelepiped).

[0119] The first yoke 61 is a ferromagnetic body, for example, formed of a metal material such as iron. The first yoke 61 is fixed to the lower surface of the movable contact 3 and is integrated with the movable contact 3 (see Figure 1 , Figure 3 ) That is, the first yoke 61 is fixed to the surface of the movable contactor 3 opposite to the surface where the first movable contact point 31 and the second movable contact point 32 are located.

[0120] When current flows through the movable contact 3, the first yoke 61 acts on the magnetic field generated by the current in such a manner that the magnetic field passes through the first yoke 61. That is, when there is no first yoke 61, a magnetic field (concentric in shape) centered on the current flowing through the movable contact 3 is generated, but when there is the first yoke 61, the magnetic field changes in such a manner that it passes through the first yoke 61. As a result, the center of the magnetic field acting on the current flowing through the movable contact 3 is guided to the side of the surface (that is, the upper surface) where the first movable contact 31 and the second movable contact 32 are located, and as a result, a relatively upward force is generated on the movable contact 3. Therefore, when there is the first yoke 61, it is easier to maintain the connection between the first movable contact 31 and the second movable contact 32 and the first fixed contact 11 and the second fixed contact 21 than when there is no first yoke 61.

[0121] A fitting recess 610 that is recessed in a cylindrical shape is formed on the lower surface of the first yoke 61 .

[0122] The second yoke 62 is a ferromagnetic body, for example, formed of a metal material such as iron. The second yoke 62 is fixed to be separated from the movable contact 3 at a position opposite to the first yoke 61 across the movable contact 3. In addition, the second yoke 62 may also abut against the second end 532 (lower end) of the piston 53 of the pyrotechnic actuator 5. In the present embodiment, the second yoke 62 is fixed to the second end 532 (lower end) of the piston 53 of the pyrotechnic actuator 5. The second yoke 62 is arranged to be opposite to the central portion of the movable contact 3 (refer to Figure 2 ), and is separated from the movable contact 3 by a gap without contact (refer to Figure 3 ). The second yoke 62 is electrically insulated from the movable contactor 3 .

[0123] The second yoke 62 has a pair of protrusions 621 and 622 protruding upward at both ends in the front-rear direction (see Figure 3 In other words, at both ends of the upper surface of the second yoke 62 in the front-rear direction, protrusions 621 and 622 are formed that face the side surfaces of the movable contact 3 in the front-rear direction. Figure 3 As shown, the top end surface (lower end surface) of the front protrusion 621 of the pair of protrusions 621 and 622 faces the front end of the first yoke 61, and the top end surface (lower end surface) of the rear protrusion 622 faces the rear end of the first yoke 61. Therefore, when the current flows between the first fixed terminal 1 and the second fixed terminal 2 via the movable contact 3, a magnetic flux passing through the magnetic circuit formed by the first yoke 61 and the second yoke 62 is generated. At this time, the front end of the first yoke 61 and the protrusion 621 at the front end of the second yoke 62 are magnetized to have different poles, and the rear end of the first yoke 61 and the protrusion 622 at the rear end of the second yoke 62 are magnetized to have different poles. As a result, an attractive force acts between the first yoke 61 and the second yoke 62. Since the second yoke 62 is fixed to the second end 532 (lower end) of the piston 53, the first yoke 61 is attracted upward by the attractive force. Since the first yoke 61 is attracted upward, an upward force acts on the movable contactor 3 from the first yoke 61 .

[0124] When current flows through the movable contact 3, due to the current, an electromagnetic repulsive force may be generated to pull the first movable contact 31 and the second movable contact 32 away from the first fixed contact 11 and the second fixed contact 21. That is, when current flows through the movable contact 3, an electromagnetic repulsive force may act on the movable contact 3 in a direction to move the movable contact 3 downward due to the Lorentz force.

[0125] In the present embodiment, as described above, the first yoke 61 is used to change the magnetic field so that it passes through the first yoke 61, and an upward force is generated compared to the case where there is no first yoke 61. In addition, the above-mentioned attractive force acts between the first yoke 61 and the second yoke 62. As a result, the current flowing through the movable contact 3 acts to push the movable contact 3 upward, that is, the first movable contact 31 and the second movable contact 32 are pressed against the first fixed contact 11 and the second fixed contact 21, respectively.

[0126] As described above, the first yoke 61 and the second yoke 62 function as a connection maintaining mechanism that generates a force for maintaining the connection between the first movable contact 31 and the second movable contact 32 and the first fixed contact 11 and the second fixed contact 21 by utilizing the current flowing through the movable contact 3 .

[0127] Spacers 631 and 632 made of an electrically insulating material such as a resin material are arranged between the protrusions 621 and 622 of the second yoke 62 and both ends of the upper surface of the first yoke 61 in the front-rear direction (see Figure 3 ). Thus, electrical insulation between the second yoke 62 and the first yoke 61 is ensured.

[0128] like Figure 1 , Figure 3 As shown, the holding portion 4 of the present embodiment includes a crimping spring 41. The crimping spring 41 is a coil spring. The crimping spring 41 is arranged between the bottom surface (inner surface) of the inner cylinder 71 and the lower surface of the first yoke 61. The spiral axis of the crimping spring 41 is along the up-down direction. The holding rib 711 of the inner cylinder 71 is inserted into the inner side of the first end 411 of the crimping spring 41. The second end 412 of the crimping spring 41 is inserted into the fitting recess 610 of the first yoke 61. The crimping spring 41 applies force to the movable contact 3 upward via the first yoke 61. That is, the holding portion 4 includes an elastic portion (crimping spring 41) that applies force to the movable contact 3 in the direction of connecting the movable contact (first movable contact) 31 with the fixed contact (first fixed contact) 11.

[0129] The contact pressure spring 41 urges the movable contact 3 upward via the first yoke 61. The contact pressure spring 41 holds the movable contact 3 so that the first movable contact 31 is connected to the first fixed contact 11 and the second movable contact 32 is connected to the second fixed contact 21.

[0130] exist Figure 4 2 is a cross-sectional view of the pyrotechnic actuator 5 of the present embodiment. The pyrotechnic actuator 5 of the present embodiment has a so-called push-pull structure in which the piston 53 (pin 535) is pushed out by the gas generated by the igniter 51.

[0131] like Figure 4As shown, the pyrotechnic actuator 5 includes an igniter 51 , a housing 52 having a pressurized chamber 520 therein, and a piston 53 .

[0132] The igniter 51 includes a main body 511 , a metal sleeve (metal can) 512 , a combustion portion 513 , a pair of needle electrodes 514 , and a heating element 515 .

[0133] The main body 511 is formed of, for example, an electrically insulating resin material, and is formed in a bottomed cylindrical shape with an open upper surface and a closed lower surface. The internal space 5110 of the main body 511 is sealed by an electrically insulating sealing material such as glass.

[0134] The metal sleeve 512 is made of a metal such as stainless steel, and integrally has a cylindrical portion with a bottom that is open on the upper surface and closed on the lower surface, and a flange portion that protrudes laterally from the upper end of the cylindrical portion. A cross groove of a depth that does not penetrate the lower wall is formed in the center of the lower wall of the metal sleeve 512 (cylindrical portion). In other words, a portion of the lower wall of the metal sleeve 512 becomes a low-strength portion that is lower in strength (easy to break) than the other portions of the metal sleeve 512. The metal sleeve 512 is combined with the main body 511 at the flange portion by bonding or the like in a manner that covers the lower surface of the main body 511.

[0135] The combustion part 513 contains explosives such as nitrocellulose, for example. The combustion part 513 is arranged in a space surrounded by the main body 511 and the metal sleeve 512. The explosives contained in the combustion part 513 may be any material that generates a large amount of gas by combustion, and is not limited to nitrocellulose.

[0136] The first ends of the pair of needle electrodes 514 are located in the combustion section 513 (in the space surrounded by the body 511 and the metal sleeve 512 ), and the second ends are exposed to the outside of the pyrotechnic actuator 5 through the body 511 . The second ends of the pair of needle electrodes 514 are connected to the control circuit 207 .

[0137] The heating element 515 is an element that generates heat by passing electricity, and in this embodiment, is a nickel-chromium heating wire. The heating element 515 is arranged in the combustion part 513 (in the space surrounded by the main body 511 and the metal sleeve 512). The heating element 515 is connected between the first ends of a pair of needle electrodes 514.

[0138] In the igniter 51, when the current from the control circuit 207 is applied between the pair of needle electrodes 514, the heating element 515 generates heat, and the temperature of the combustion portion 513 rises. If the temperature of the combustion portion 513 (the portion surrounding the heating element 515) exceeds the ignition temperature, the gunpowder burns explosively and instantly generates a large amount of gas (e.g., carbon monoxide gas, carbon dioxide gas, nitrogen gas). If the pressure in the combustion portion 513 exceeds the withstand pressure of the low-strength portion of the metal sleeve 512 due to the generation of gas, the low-strength portion breaks, and the gas generated by the combustion is released to the outside (in this embodiment, the lower pressurized chamber 520) through the broken portion.

[0139] like Figure 4 As shown, the piston 53 includes a base 533 , a cylinder 534 , a pin (rod) 535 and a spring 536 .

[0140] The base 533 is formed of an electrically insulating material such as resin, for example, polycarbonate or polybutylene terephthalate. The base 533 has, from the top, a first column portion, a second column portion, and a third column portion, each of which is cylindrical, in sequence, and has a shape in which the first column portion, the second column portion, and the third column portion are connected up and down in an axially aligned manner (in a concentric shape). The outer diameter of the first column portion is larger than the outer diameter of the second column portion, and the outer diameter of the second column portion is larger than the outer diameter of the third column portion. On the outer side surface of the base 533, a circular annular retaining groove 5330 concentric with the first column portion and the second column portion is formed at the boundary between the first column portion and the second column portion.

[0141] In the present embodiment, the bottom surface (upper surface) of the first column portion of the base 533 serves as the first end 531 of the piston 53 .

[0142] The cylinder 534 is formed of a material having electrical insulation properties, such as resin. The cylinder 534 is formed in a cylindrical shape. The inner diameter of the cylinder 534 is substantially equal to the outer diameter of the third column of the base 533, and is smaller than the outer diameter of the second column. The outer diameter of the cylinder 534 is smaller than the outer diameter of the second column of the base 533. The third column of the base 533 is embedded in the upper surface opening of the cylinder 534, and the cylinder 534 is combined with the base 533.

[0143] The pin 535 is formed of an electrically insulating material such as resin, for example, polycarbonate or polybutylene terephthalate. The pin 535 has a large diameter portion and a small diameter portion, each of which is cylindrical, in order from the top, and has a shape in which the large diameter portion and the small diameter portion are connected up and down in an axially aligned manner (in a concentric shape). The axial length (up and down direction) of the large diameter portion of the pin 535 is about the same as the length of the cylinder 534. Specifically, the length of the pin 535 is slightly larger than the distance between the bottom surface (lower surface) of the base 533 connected to the cylinder 534 and the lower end of the cylinder 534. As Figure 1As shown, the small diameter portion of the pin 535 is fixed in the through hole of the second yoke 62. In the present embodiment, the region including the small diameter portion of the pin 535 is the second end 532 of the piston 53.

[0144] like Figure 4 As shown, the spring 536 is a coil spring. The spring 536 defines the relative position between the cylinder 534 and the pin 535. Specifically, the spring 536 is sandwiched between the inner side of the cylinder 534 and the outer side of the pin 535, and holds the pin 535 inside the cylinder 534.

[0145] The housing 52 includes a holder 521, a sleeve 522, a cover 523, a first holding spring 524, and a second holding spring 525. The housing 52 is formed in a substantially cylindrical shape as a whole.

[0146] The holder 521 of the housing 52 is made of metal, such as aluminum or aluminum alloy. The holder 521 is formed into a substantially cylindrical shape with an open upper surface and a lower surface, and the inner side surface is formed into a cylindrical surface shape with multiple steps. The holder 521 holds the igniter 51 and the piston 53.

[0147] The igniter 51 is embedded in the space of the upper part of the holder 521 of the housing 52. The inner surface of the upper part of the holder 521 has a shape that is in close contact with the outer surface of the igniter 51 (the outer surface of the body 511, the outer surface of the flange of the metal sleeve 512, and the outer surface of the cylindrical part of the metal sleeve 512). The upper opening of the holder 521 (the inner space thereof) is closed by the igniter 51.

[0148] The base 533 of the piston 53 is embedded in the space of the lower part of the retainer 521 of the housing 52. The inner surface of the lower part of the retainer 521 has a shape that is substantially in close contact with the outer surface of the first column portion of the base 533. The lower opening of the retainer 521 (the inner space) is closed by the piston 53 (the base 533).

[0149] By installing the igniter 51 and the piston 53 in the housing 52, a closed airtight space is formed between the lower surface of the igniter 51 (the metal sleeve 512), the upper surface of the piston 53 (the base 533), and the inner surface of the housing 52 (the retainer 521). The gas generated by the igniter 51 is introduced into the airtight space through the broken portion of the lower wall of the metal sleeve 512. In other words, the airtight space functions as a pressurized chamber 520 that withstands the pressure of the gas generated by the igniter 51.

[0150] The sleeve 522 of the housing 52 is made of metal, for example, steel. The sleeve 522 is formed into a generally cylindrical shape with an upper surface and a lower surface opened. The sleeve 522 has a first cylindrical portion, a second cylindrical portion, and a third cylindrical portion, respectively, from the top, in order, and has a shape in which the first cylindrical portion, the second cylindrical portion, and the third cylindrical portion are connected up and down in an axially aligned manner (in a concentric shape). The inner side surface of the first cylindrical portion is formed into a tapered shape with a smaller diameter as it goes downward. The inner side surface of the second cylindrical portion is formed into a cylindrical surface shape with a constant diameter. The inner diameter of the second cylindrical portion is approximately equal to the outer diameter of the first column portion (the portion with the largest diameter) of the base 533 of the piston 53. The inner side surface of the third cylindrical portion is formed into a tapered shape with a smaller diameter as it goes downward. The diameter of the inner side surface of the third cylindrical portion is approximately equal to the outer diameter of the first column portion (the portion with the largest diameter in the base 533) of the base 533 at the upper end, and the diameter becomes smaller as it goes downward. That is, the third tube portion of the sleeve 522 is shaped such that the base 533 of the piston 53 cannot pass through the interior of the third tube portion.

[0151] The cover 523 of the housing 52 is made of metal, for example, steel. The cover 523 is formed into a cylindrical shape with openings on both the upper and lower surfaces. A protrusion (flange) protruding inward is formed on the lower surface of the cover 523. The inner diameter of the protrusion (flange) is substantially equal to the outer diameter of the cylinder 534 of the piston 53. The piston 53 is an actuating pin that moves in one direction under the pressure of the gas generated by the igniter 51.

[0152] In this embodiment, the outer diameters of the holder 521 , the sleeve 522 , and the cover 523 are equal.

[0153] The first retaining spring 524 has a hollow disc-shaped clamped portion and a hollow truncated cone-shaped retaining portion protruding obliquely upward from the inner side surface of the clamped portion. The clamped portion of the first retaining spring 524 is clamped between the retaining member 521 and the sleeve 522 of the housing 52, whereby the first retaining spring 524 is clamped between the retaining member 521 and the sleeve 522. The first retaining spring 524 seals the gap at the boundary between the retaining member 521 and the sleeve 522. The retaining portion contacts the retaining groove 5330 of the base 533 of the piston 53, exerts an upward force on the base 533, and retains the base 533 (prevents the base 533 from moving downward).

[0154] The second retaining spring 525 has a hollow disc-shaped clamped portion and a hollow truncated cone-shaped retaining portion protruding obliquely downward from the inner side surface of the clamped portion. The clamped portion of the second retaining spring 525 is clamped between the sleeve 522 and the cover 523 of the housing 52, whereby the second retaining spring 524 is clamped between the sleeve 522 and the cover 523. The second retaining spring 525 seals the gap at the boundary between the sleeve 522 and the cover 523. The protruding top end of the retaining portion is separated from the outer side surface of the cylinder 534 of the piston 53. The diameter of the protruding top end of the retaining portion is approximately equal to the outer diameter of the second column portion of the base 533 of the piston 53.

[0155] like Figure 4 As shown, in a state where the igniter 51 and the piston 53 are assembled to the housing 52, the needle electrode 514 of the igniter 51 protrudes from the upper surface of the housing 52. In addition, the small diameter portion of the pin 535 protrudes downward from the lower surface of the housing 52.

[0156] like Figure 1 As shown, the pyrotechnic actuator 5 is mounted on the housing 7 in such a manner that the through hole 731 of the cover member 73 is blocked by the housing 52. In this state, the second end of the piston 53 (the lower end of the pin 535) faces the center of the movable contact 3 (the center in the length direction and the width direction).

[0157] (1.2.3) Action

[0158] Next, based on Figure 1 , Figure 6 , Figure 7 The operation of the circuit interrupting device 100 having the above configuration will be described.

[0159] The first electrode 12 of the circuit disconnecting device 100 is connected to the first end of the electric circuit (for example, the circuit constituting the power supply system 200), and the second electrode 22 is connected to the second end of the electric circuit. Here, it is assumed that the first end of the electric circuit is at a higher potential than the second end.

[0160] When the electrical circuit is normal, the first movable contact 31 is connected to the first fixed contact 11 and the second movable contact 32 is connected to the second fixed contact 21 by the spring force of the crimping spring 41 (see Figure 1 At this time, the current flows from the first electrode 12 to the second electrode 22 via the first fixed contact 11 , the first movable contact 31 , the movable contact 3 , the second movable contact 32 , and the second fixed contact 21 in this order.

[0161] At this time, the contact between the first movable contact 31 and the first fixed contact 11 and the contact between the second movable contact 32 and the second fixed contact 21 are maintained by the spring force of the crimping spring 41, the attraction between the first yoke 61 and the second yoke 62, etc. In addition, even if an overcurrent or the like flows through the circuit disconnecting device 100, if the magnitude of the overcurrent or the like is relatively small, the contact between the contacts is maintained by the attraction between the first yoke 61 and the second yoke 62, etc.

[0162] When an abnormality occurs in the electrical circuit, for example, the control circuit 207 detects that an abnormality has occurred in the electrical circuit. When the abnormality is detected, the control circuit 207 operates (starts) the circuit disconnecting device 100 to disconnect the electrical circuit.

[0163] Specifically, the control circuit 207 allows current to flow between the pair of needle electrodes 514, and energizes the heating element 515. The heating element 515 generates heat when energized, causing the temperature of the combustion section 513 to rise. If the temperature of the combustion section 513 exceeds the ignition temperature of the gunpowder, the gunpowder burns and generates a large amount of gas. Due to the pressure of the gas, the low-strength portion of the lower wall of the metal sleeve 512 breaks, and the gas is released into the pressurized chamber 520 through the broken portion. The combustion section 513 burns explosively and generates a large amount of gas, so the pressure of the pressurized chamber 520 increases rapidly in a short time.

[0164] The piston 53 is pressed downward by the pressure in the pressurized chamber 520 at the first end 531 (the upper surface of the base 533), and the movable contact 3 is pressed downward at the second end 532 (the pin 535). The piston 53 applies force to the portion between the first movable contact point 31 and the second movable contact point 32 of the movable contact 3, so that the movable contact 3 moves downward.

[0165] Specifically, in the piston 53, the bottom surface (upper surface) of the base 533 receives the pressure in the pressurizing chamber 520, and the base 533 overcomes the spring force of the first holding spring 524 and starts to move downward together with the cylinder 534. At this time, the initial velocity of the base 533 (piston 53) becomes very large due to the large pressure in the pressurizing chamber 520. The pin 535 receives a downward force from the cylinder 534 via the spring 536, and starts to move downward a little after the cylinder 534 starts to move downward. The pin 535, the second yoke 62, the first yoke 61 and the movable contact 3 are integrated, and due to the downward movement of the pin 535, the movable contact 3 is pressed downward and moves downward. Here, after the base 533 starts to move downward, elastic energy is accumulated in the spring 536, and the force generated by the elastic energy also acts on the pin 535, so that the pin 535 is applied with a very large downward force, and its initial velocity also increases.

[0166] If the force pressing the movable contact 3 downward exceeds the force supporting the movable contact 3 upward (the spring force of the contact spring 41, the attraction between the first yoke 61 and the second yoke 62, etc.), the movable contact 3 compresses the contact spring 41 with the help of the first yoke 61 and moves downward. As a result, the first movable contact 31 is pulled away from the first fixed contact 11, and the second movable contact 32 is pulled away from the second fixed contact 21 (see Figure 6 ). As a result, the circuit between the first fixed terminal 1 and the second fixed terminal 2 is cut off, and the current flowing in the circuit between the first fixed terminal 1 and the second fixed terminal 2 is cut off.

[0167] The piston 53, the first yoke 61, the movable contact 3 and the second yoke 62 are integrated (hereinafter, for the sake of convenience, the piston 53, the first yoke 61, the movable contact 3 and the second yoke 62 are collectively referred to as the "moving body") and move downward. The direction in which the piston 53 moves is the same as the direction in which the movable contact 3 is moved by the piston 53. As a typical example, the moving body moves to a position where the pressure contact spring 41 is compressed to the maximum extent (refer to Figure 7 ). At this time, the base 533 of the piston 53 moves in the third cylinder portion while expanding (deforming) the inner surface of the third cylinder portion of the sleeve 522 of the housing 52. In addition, the kinetic energy of the moving body is converted into the elastic energy of the pressure contact spring 41, the heat energy generated when the moving body collides with the bottom surface of the inner cylinder 71, and the like.

[0168] The movable body is subjected to an upward force from the compressed contact spring 41 at the position where the contact spring 41 is compressed. However, the upward movement of the movable body is prevented by the friction between the base 533 and the third cylinder portion of the sleeve 522 of the housing 52 and the pressure of the gas filling the housing 52 (pressurized chamber 520). Figure 7 The third barrel portion stops at the position shown. That is to say, the third barrel portion functions as a non-return mechanism that mechanically holds the piston 53 after the movable contact 3 moves and prevents the piston 53 from returning to its original position. In addition, in the present embodiment, a non-return mechanism is not necessarily required. As long as the pressure of the gas filling the housing 52 is large enough to overcome the spring force of the crimping spring 41 and prevent the movable body from moving upward (at the position where the movable contacts 31, 32 are pulled apart from the fixed contacts 11, 21), the non-return mechanism can be omitted. In this case, the inner side surface of the third barrel portion, for example, can also be a cylindrical surface with a constant diameter, like the second barrel portion.

[0169] Here, if the first movable contact 31 is pulled away from the first fixed contact 11 while current is flowing through the movable contact 3, an arc may be generated between the first movable contact 31 and the first fixed contact 11. Similarly, if the second movable contact 32 is pulled away from the second fixed contact 21 while current is flowing through the movable contact 3, an arc may be generated between the second movable contact 32 and the second fixed contact 21.

[0170] In contrast, in the circuit disconnecting device 100 of the present embodiment, the energy of the gas generated by the pyrotechnic actuator 5 is used to quickly pull the movable contacts 31 and 32 away from the fixed contacts 11 and 21 , thereby quickly extending the arc and extinguishing the arc.

[0171] The force (pressure) applied to the piston 53 by the gas generated by the igniter 51 is very large. Therefore, the movable contact 3 is pressed by the piston 53 and pulled away from the first fixed terminal 1 and the second fixed terminal 2 at high speed, and the arc generated between the contacts is quickly elongated and extinguished.

[0172] In particular, in the present embodiment, the movable contact 3 is relatively independent from the fixed terminal (first fixed terminal) 1, so the energy required to cut off the circuit itself is smaller than that of the circuit breaker of Patent Document 1 that cuts off the circuit by breaking the conductor. In other words, most of the energy generated by the igniter 51 can be used for the movement of the movable contact 3 (the kinetic energy of the movable contact 3). As a result, in the circuit disconnection device 100, the moving speed of the movable contact 3 becomes larger, and the arc extension performance and arc extinguishing performance are improved.

[0173] In addition, in the circuit breaker described in Patent Document 1, the energy generated by the pyrotechnic actuator is used to break the conductor and bend the ends of the broken portion, thereby cutting off the circuit. Therefore, in this circuit breaker, there is a possibility that the broken portions of the conductor are not sufficiently pulled apart from each other, and the gap distance between the high-voltage side circuit and the low-voltage side circuit in the broken circuit cannot be set larger, and the improvement of the current cutting performance is limited.

[0174] In this embodiment, in the storage chamber 70, the movable contact 3 moves in a direction away from the fixed terminal (first fixed terminal) 1, and the movable contact (first movable contact) 31 is pulled apart by the fixed contact (first fixed contact) 11. Therefore, compared with the circuit breaker of Patent Document 1 that breaks and bends the conductor to cut off the circuit, the distance between the contacts after the circuit is cut off can be increased. As a result, the circuit cutting device 100 can obtain a larger elongated length of the arc, and the arc extinguishing performance is improved.

[0175] In addition, since the movable contact 3 moves in the storage chamber 70, the arc generated between the first movable contact 31 and the first fixed contact 11 and between the second movable contact 32 and the second fixed contact 21 is confined in the storage chamber 70. Therefore, the arc is difficult to leak to the outside of the circuit disconnecting device 100. That is, the storage chamber 70 is also an arc extinguishing chamber that confines the arc generated between the first movable contact 31 and the first fixed contact 11 and between the second movable contact 32 and the second fixed contact 21 to extinguish the arc.

[0176] In one example, the moving time of the movable contact 3 (from Figure 1 Move to the position shown Figure 7 The moving distance of the movable contact 3 in the storage chamber 70 ( Figure 1 The position shown is Figure 7 The distance between the positions shown in FIG. 1 and FIG. 2 is about 20 mm to 30 mm. However, the characteristics of the circuit disconnecting device 100 are not limited to these values, and can be appropriately designed as needed.

[0177] (2) Modification

[0178] The above-described embodiment is only one of various embodiments of the present disclosure. In addition, the above-described embodiment can be variously modified according to design, etc. as long as the purpose of the present disclosure can be achieved. Some modified examples of the above-described embodiment are listed below. The above-described embodiment and the following modified examples can be appropriately combined.

[0179] (2.1) Modification 1

[0180] The structure of the sales promotion type pyrotechnic actuator 5 is not limited to Figure 4 The structure shown. Figure 8 2 is a cross-sectional view of the pyrotechnic actuator 5 of the circuit disconnecting device 100 according to the first modification (the pyrotechnic actuator 5 having a structure different from that of the embodiment).

[0181] The pyrotechnic actuator 5 of this modification is different from the pyrotechnic actuator 5 of the circuit disconnecting device 100 of the embodiment mainly in the structure of the housing 52 and the piston 53. In the circuit disconnecting device 100 (pyrotechnic actuator 5) of this modification, the same reference numerals are attached to the same structures as those of the embodiment, and the description thereof is omitted as appropriate.

[0182] like Figure 8 As shown, the housing 52 includes a retainer 521 and a sleeve 522. The housing 52 is formed in a substantially cylindrical shape as a whole.

[0183] The holder 521 of the housing 52 is made of metal, for example, aluminum or an aluminum alloy. The holder 521 is formed into a roughly cylindrical shape with openings on the upper and lower surfaces. The igniter 51 is embedded in the internal space of the holder 521. The inner surface of the holder 521 has a shape that is roughly in close contact with the outer surface of the igniter 51 (the outer side surface of the main body 511, the outer surface of the flange portion of the metal sleeve 512, and the outer side surface of the upper part of the cylindrical portion of the metal sleeve 512). The holder 521 holds the igniter 51 in a manner that the lower part of the metal sleeve 512 protrudes from the opening on the lower side of the holder 521. The holder 521 has a cylindrical limiting portion 5211 at its lower end. The limiting portion 5211 extends along the outer side surface of the upper part of the cylindrical portion of the metal sleeve 512.

[0184] The sleeve 522 of the housing 52 is made of metal, for example, steel. The sleeve 522 is formed into a generally cylindrical shape with an upper surface and a lower surface opened. The sleeve 522 of this modified example has a first cylindrical portion, a second cylindrical portion, and a third cylindrical portion, respectively, from the top, and has a shape in which the first cylindrical portion, the second cylindrical portion, and the third cylindrical portion are connected up and down in an axially aligned manner (in a concentric shape).

[0185] The inner side surface of the first cylinder portion is formed into a cylindrical surface with a constant diameter. The inner diameter of the first cylinder portion is substantially equal to the outer diameter of the limiting portion 5211 of the retaining member 521. In addition, the inner diameter of the first cylinder portion is substantially equal to the outer diameter of the large diameter portion (described later) of the pin 535 of the piston 53. The second cylinder portion is formed into a tapered cylinder whose diameter decreases as it goes downward. The inner side surface of the third cylinder portion is formed into a cylindrical surface with a constant diameter. The inner diameter of the third cylinder portion is slightly larger than the outer diameter of the small diameter portion (described later) of the pin 535 of the piston 53. In addition, the inner diameter of the third cylinder portion is smaller than the outer diameter of the large diameter portion of the pin 535 of the piston 53. In other words, the third cylinder portion of the sleeve 522 is a shape through which the pin 535 (large diameter portion) of the piston 53 cannot pass.

[0186] The sleeve 522 is coupled to the holder 521 by fitting the upper end portion of the large diameter portion around the restricting portion 5211 of the holder 521 .

[0187] like Figure 8 As shown, in this modification, the piston 53 includes only the pin 535 .

[0188] The pin 535 is formed of a material having electrical insulation properties, such as resin, for example, polycarbonate or polybutylene terephthalate. The pin 535 has a cylindrical large diameter portion, a middle diameter portion, a small diameter portion, and a protruding portion in order from the top, and the large diameter portion, the middle diameter portion, the small diameter portion, and the protruding portion are arranged in an axially aligned manner (in a concentric shape). The outer diameter of the large diameter portion is larger than the outer diameter of the middle diameter portion. The outer diameter of the middle diameter portion is larger than the outer diameter of the small diameter portion. The outer shape of the small diameter portion is larger than the outer shape of the protruding portion. The large diameter portion and the middle diameter portion are connected by a first columnar connecting portion whose diameter decreases as the large diameter portion moves toward the middle diameter portion. The middle diameter portion and the small diameter portion are connected by a second columnar connecting portion whose diameter decreases as the middle diameter portion moves toward the small diameter portion. The protruding portion protrudes downward from the bottom surface (lower surface) of the small diameter portion. In other words, the pin 535 is a columnar shape whose diameter decreases as it moves downward (the farther away from the igniter 51). In this modification, the bottom surface (upper surface) of the large diameter portion of the pin 535 is the first end 531 of the piston 53. In addition, the region including the protruding portion of the pin 535 is the second end 532 of the piston 53.

[0189] An elastic rib 5351 is integrally provided on the peripheral portion of the upper surface of the large diameter portion of the pin 535. The elastic rib 5351 is elastic. The elastic rib 5351 is formed into a tapered cylindrical shape with the inner diameter and the outer diameter gradually increasing and the thickness decreasing as it goes upward. Figure 8 In the example, the left end portion) is provided with a positioning stopper 5352 protruding upward.

[0190] The pin 535 (piston 53) is held in the sleeve 522. The pin 535 is arranged in the sleeve 522 in such a manner that the protrusion protrudes from the opening on the lower side of the sleeve 522. The pin 535 is held in the sleeve 522 by elastic contact between the outer side surface of the elastic rib 5351 and the inner surface of the first cylindrical portion of the sleeve 522. The outer side surface of the pin 535 and the inner surface of the sleeve 522 are sealed without a gap by the elastic rib 5351.

[0191] like Figure 8 As shown, by installing the igniter 51 and the piston 53 in the housing 52, a closed airtight space (pressurized chamber 520) is formed between the igniter 51 (the outer side of the metal sleeve 512), the inner surface of the housing 52 and the upper surface of the piston 53.

[0192] In addition, when the igniter 51 and the piston 53 are mounted in the housing 52, the piston 53 (pin 535) is prevented from being excessively pressed into the housing 52. That is, even if the protruding portion of the pin 535 is pressed upward, the upward movement of the pin 535 is prevented because the positioning stopper 5352 of the pin 535 contacts the limiting portion 5211 of the retainer 521. Thus, the pin 535 can be located within a predetermined range in the housing 52.

[0193] In this modified example as well, when the igniter 51 generates gas, the piston 53 (pin 535) receives the pressure in the pressurized chamber 520 at the first end 531, moves downward under the action of the rising pressure in the pressurized chamber 520, and presses the movable contact 3 at the second end 532. As a result, the movable contact 3 can be moved downward, the first movable contact 31 is pulled away from the first fixed contact 11, and the second movable contact 32 is pulled away from the second fixed contact 21.

[0194] In addition, when the piston 53 is pressed downward by the pressure in the pressurized chamber 520, the piston 53 advances downward while expanding the third cylinder portion of the sleeve 522 by the middle diameter portion of the pin 535, and stops at a position where the first connecting portion of the pin 535 contacts the second cylinder portion of the sleeve 522. At this time, a friction force acts between the middle diameter portion of the pin 535 and the third cylinder portion of the sleeve 522, preventing the movement (upward and downward movement) of the pin 535. In other words, the third cylinder portion of this modified example functions as a non-return mechanism that mechanically holds the piston 53 after the movable contact 3 moves and prevents the piston 53 from returning to its original position.

[0195] Of course, the push-pull type pyrotechnic actuator 5 is not limited to the structures of the above-mentioned embodiment and modification 1, and may have other structures.

[0196] (2.2) Modification 2

[0197] The pyrotechnic actuator 5 may have a so-called pin pulling structure in which the piston 53 (pin 535 ) is pulled by the gas generated by the igniter 51 .

[0198] exist Fig. 9 A. Fig. 9 B shows a circuit interruption device 100 of a second modification example including a pyrotechnic actuator 5 having a pull-out pin structure. In the circuit interruption device 100 of the second modification example, the same reference numerals are used for the same components as those of the embodiment, and description thereof is omitted as appropriate.

[0199] The circuit disconnecting device 100 of this modified example does not include the first yoke 61 and the second yoke 62. In addition, the second end 532 of the piston 53 is coupled to the movable contact 3. In addition, the housing 52 of the pyrotechnic actuator 5 is disposed in the through hole formed in the inner cylinder 71 and the outer cylinder 72, and the through hole is blocked airtightly. The crimping spring 41 is disposed between the housing 52 of the pyrotechnic actuator 5 and the movable contact 3, and is pressed toward the movable contact 3 toward the first fixed terminal 1 and the second fixed terminal 2 ( Fig. 9 A of A is downwardly directed to apply force to the movable contact 3. A recess (not shown) for receiving the end of the crimping spring 41 is formed at a position corresponding to the crimping spring 41 on the upper surface of the movable contact 3 and the lower surface of the housing 52.

[0200] In this modification, the piston 53 of the pyrotechnic actuator 5 is formed to have a Fig. 9 A cylindrical columnar portion extending in the vertical direction of A and an end portion of the columnar portion ( Fig. 9 The cross section of the flange portion (the upper end of A) extending laterally is T-shaped. The housing 52 has a pressurized chamber 520, which is opposite to the side surface of the columnar portion of the piston 53. The top end of the columnar portion (the second end 532 of the piston 53) is connected to the movable contact 3.

[0201] When current flows between the pair of needle electrodes 514 and the igniter 51 is ignited, gas is generated from the igniter 51, the pressure in the pressurizing chamber 520 increases, and the piston 53 moves to the Fig. 9 The movable contact 3 is pulled by the second end 532 of the piston 53, and moves together with the piston 53 in a direction away from the first fixed terminal 1 and the second fixed terminal 2 ( Fig. 9 As a result, the first movable contact 31 and the second movable contact 32 are pulled away from the first fixed contact 11 and the second fixed contact 21 (see Fig. 9 As a result, the circuit between the first fixed terminal 1 and the second fixed terminal 2 is cut off, and the current flowing in the circuit between the first fixed terminal 1 and the second fixed terminal 2 is cut off.

[0202] (2.3) Modification 3 to Modification 5

[0203] The holding portion 4 is not limited to the pressure contact spring 41 .

[0204] For example, the holding portion 4 may also be Fig.10 Modification 3 shown, Fig.11 As in the modified example 4 shown, permanent magnets 421 and 422 are included.

[0205] exist Fig.10 In the third modification shown, the movable contact 3 has a main body 330 and a pair of protrusions 340, and is formed in a cross shape when viewed from above. The main body 330 is long in the left-right direction, and has a first movable contact 31 and a second movable contact 32 at both ends in the length direction. The pair of protrusions 340 protrude from the side of the main body 330 in the front-rear direction. The protrusions 340 of the movable contact 3 are respectively provided with a plate-shaped magnetic member made of a magnetic material, specifically, an iron sheet 4210. The center of the movable contact 3 is opposite to the top of the pin 535 of the pyrotechnic actuator 5. In addition, a pair of permanent magnets 421 are provided on the lower surface of the cover member 73 of the housing 7 and in front and behind the pyrotechnic actuator 5 (positions opposite to the iron sheet 4210). In addition, the circuit disconnection device 100 of the third modification does not include the first yoke 61 and the second yoke 62. In addition, the other structures in the third modification are the same as those of the circuit disconnection device 100 of the embodiment, so the illustration and detailed description are omitted.

[0206] In the modification 3, the first movable contact 31 and the second movable contact 32 are connected to the first fixed contact 11 and the second fixed contact 21 in a state where the permanent magnet 421 is in direct contact with the iron sheet 4210. Thus, the movable contact 3 is maintained by the holding portion 4 (permanent magnet 421) so that the first movable contact 31 and the second movable contact 32 are connected to the first fixed contact 11 and the second fixed contact 21. In addition, the permanent magnet 421 may also maintain the movable contact 3 so that the first movable contact 31 and the second movable contact 32 are connected to the first fixed contact 11 and the second fixed contact 21 in a state where a gap is separated from the iron sheet 4210. In addition, a gasket may be provided between the permanent magnet 421 and the iron sheet 4210. In addition, the permanent magnet 421 may be provided on the movable contact 3, and the iron sheet 4210 may be provided on the housing 7. The number of permanent magnets 42 is not limited to two, and may be one or three or more.

[0207] exist Fig.11 In the modification 4 shown in the figure, the movable contact 3 includes a main body 330 and a pair of extensions 350 (in Fig.11 , only one is shown in the figure). The main body 330 is longer in the left-right direction, and has the first movable contact 31 and the second movable contact 32 at both ends in the length direction. A pair of extensions 350 are L-shaped when viewed from the side. A pair of extensions 350 extend downward from both ends in the left-right direction of the main body 330 and separate from the main body 330, forming a mutually symmetrical shape. A permanent magnet 422 is provided on the upper surface of the protruding top of the extension 350. In addition, a plate-shaped magnetic member made of magnetic material and protruding inward is provided in the shell body 710 of the shell 7 composed of an inner cylinder 71 and an outer cylinder 72, specifically, an iron sheet 4220. When the permanent magnet 422 is in direct contact with the iron sheet 4220, the first movable contact 31 and the second movable contact 32 are connected to the first fixed contact 11 and the second fixed contact 21. In addition, since the other structures in the modification example 4 are the same as those of the circuit disconnection device 100 of the embodiment, illustration and detailed description are omitted.

[0208] In the fourth modification as well, the movable contact 3 is held by the permanent magnet 422 (holding portion 4 ) so that the first movable contact 31 and the second movable contact 32 are connected to the first fixed contact 11 and the second fixed contact 21 .

[0209] In addition, the holding portion 4 may also be Fig.12 As in the illustrated modification 5, a latch mechanism 43 for mechanically holding the movable contact 3 is provided.

[0210] exist Fig.12In the modification 5 shown, the latch mechanism 43 includes a pair of plate-shaped supporting members 430 and a pair of coil springs 431 as elastic members. A recess 7100 of a shape in which the supporting member 430 fits is formed on the side of the housing body 710. One end of the coil spring 431 is fixed to the bottom surface of the recess 7100, and the bottom surface of the base of the supporting member 430 is fixed to the other end. The top end of the supporting member 430 protrudes from the recess 7100. The upper surface of the top end of the supporting member 430 is an inclined surface. The bottom surfaces of both ends of the movable contact 3 in the longitudinal direction (left-right direction) are supported by a pair of supporting members 430 so that the first movable contact 31 and the second movable contact 32 are connected to the first fixed contact 11 and the second fixed contact 21.

[0211] When the movable contact 3 is pressed downward by the piston 53 of the pyrotechnic actuator 5, the pair of support members 430 are pressed by the movable contact 3. The support members 430 are pressed by the movable contact 3 and are pressed into the recess 7100 while compressing the coil spring 431. As a result, the movable contact 3 moves downward.

[0212] In the fifth modification, the movable contact 3 is held by the holding portion 4 (latch mechanism 43) so that the first movable contact 31 and the second movable contact 32 are connected to the first fixed contact 11 and the second fixed contact 21. In addition, the latch mechanism 43 may be configured such that the support member 430 protrudes from the side surface of the housing body 710 instead of the coil spring 431. In this case, the strength of the support member 430 may be such that the movable contact 3 pressed by the pyrotechnic actuator 5 is bent.

[0213] In addition, the holding portion 4 may also include other holding structures in addition to the crimping spring 41, the permanent magnet 42, and the latch mechanism 43. In addition, the holding portion 4 may also include two or more of the crimping spring 41, the permanent magnet 42, the latch mechanism 43, and other holding structures (for example, the crimping spring 41 and the permanent magnet 42 are included at the same time).

[0214] The crimping spring 41 is a compression spring in the embodiment, but may also be a tension spring. The crimping spring 41 composed of a tension spring may be arranged between the cover member 73 and the movable contact 3 in the circuit disconnection device 100 of the embodiment, for example. The number of the crimping springs 41 is not limited to one, and may be two or more.

[0215] (2.4) Modification 6 to Modification 18

[0216] In the circuit disconnection device 100, as described above, when current flows through the movable contact 3, an electromagnetic repulsive force that pulls the movable contact (first movable contact) 31 away from the fixed contact (first fixed contact) 11 is sometimes generated. In the circuit disconnection device 100, it is preferred that the movable contact (first movable contact) 31 and the fixed contact (first fixed contact) 11 are stably connected except when the electrical circuit is abnormal (except when the movable contact 3 is moved by the pyrotechnic actuator 5). The following is a modified example of a structure for stabilizing the connection state of the movable contact (first movable contact) 31 and the fixed contact (first fixed contact) 11 in response to the electromagnetic repulsive force. (2.4.1)

[0218] Fig.13The circuit disconnection device 100 of the modification example 6 shown has only one set of movable contacts 31 and fixed contacts 11 in the circuit connecting the first electrode 12 and the second electrode 22. Specifically, in the modification example 6, the movable contact 3 and the second fixed terminal 2 are connected not by a contact group composed of a combination of movable contacts and fixed contacts, but by a braided wire 64 formed by braiding copper wires. The braided wire 64 is a flexible wire that can be bent and deformed. The second fixed terminal 2 has a first fixed portion 29 that fixes one end of the braided wire 64, and the movable contact 3 has a second fixed portion 39 that fixes the other end of the braided wire 64. That is, the movable contact 3 has a contact device that contacts and separates from the fixed contact 11 of the first fixed terminal 1 and is connected to the second fixed terminal 2 via a flexible wire. The braided wire 64 is longer than the straight distance connecting the first fixed portion 29 and the second fixed portion 39, and has a curved portion 640 between one end and the other end of the braided wire 64. The braided wire 64 extends from the first fixed portion 29 to a position below the movable contact 3, and the bent portion 640 is arranged at a position below the movable contact 3. In addition, the bent portion 640 can also be arranged at a position above the movable contact 3. The bent portion 640 is deformed in accordance with the relative movement between the movable contact 3 and the second fixed terminal 2. The circuit disconnection device 100 includes an elastic portion (a pressure contact spring 41) that applies force to the movable contact 3 in a direction that connects the movable contact (first movable contact) 31 with the fixed contact (first fixed contact) 11. The piston 53 applies force to the portion between the first movable contact 31 and the second fixed portion 39 of the movable contact 3 to move the movable contact 3 downward. If the movable contact 3 moves downward, the first movable contact 31 separates from the first fixed contact 11, and the second fixed portion 39 of the movable contact 3 separates from the first fixed portion 29 of the second fixed terminal. The elastic portion applies force to a portion of the movable contact 3 located between the first movable contact 31 and the second fixed portion 39. In addition, the length of the braided wire 64 (the length between one end and the other end) can be longer, shorter, or the same as the moving distance of the movable contact 3 in the storage chamber 70. If the length of the braided wire 64 is shorter than the moving distance of the movable contact 3, when the movable contact 3 is pressed and moved by the piston 53, the braided wire 64 will break due to being pulled by the movable contact 3. As a result, two insulating space gaps are generated, namely, an insulating space gap between the movable contact 3 and the first fixed terminal 1 and an insulating space gap between the movable contact 3 and the second fixed terminal 2. By generating these two insulating space gaps, the cutting performance is improved. The other structures in Modification Example 6 are the same as the circuit cutting device 100 of the embodiment, so the detailed description is omitted.

[0219] If, as in the embodiment, the number of contact groups consisting of a combination of a movable contact and a fixed contact is two before the igniter 51 of the circuit disconnection device 100 generates gas, there are two locations where the connection may become unstable due to the electromagnetic repulsion force. In contrast, if, as in Modification 6, the number of contact groups is one, the location where the connection may become unstable due to the electromagnetic repulsion force becomes one, and the connection state between the movable contact and the fixed contact (the conduction state between the first electrode 12 and the second electrode 22) can be stabilized.

[0220] In addition, you can also Fig.13 As indicated by the two-dot chain line in FIG. 8 , a spacer 641 made of an electrically insulating material such as a resin material and used to prevent contact between the movable contactor 3 and the second fixed terminal 2 is provided between the movable contactor 3 and the second fixed terminal 2 . (2.4.2)

[0222] The circuit disconnecting device 100 may include a yoke having a shape different from that in the embodiment, and the number of yokes may be different from that in the embodiment.

[0223] exist Fig.14 In the circuit disconnecting device 100 of the modification 7 shown in FIG. 1 , the second yoke 62 has no protrusion and is formed in a rectangular plate shape. On the other hand, the first yoke 61 has a pair of protrusions 611 and 612 protruding upward (toward the second yoke 62). Specifically, in the front-to-back direction ( Fig.14 The two ends in the left-right direction of the movable contact 3 are formed with protrusions 611 and 612 facing the side surfaces in the front-back direction of the movable contact 3. The other structures in the modification 7 are the same as those of the circuit disconnection device 100 of the embodiment, so the illustration and detailed description are omitted.

[0224] Even in the structure of the modification example 7, as in the embodiment, the first yoke 61 and the second yoke 62 generate a force (upward force) for maintaining the connection between the first movable contact 31 and the second movable contact 32 and the first fixed contact 11 and the second fixed contact 21. Thus, the connection state between the first movable contact 31 and the first fixed contact 11 and the connection state between the second movable contact 32 and the second fixed contact 21 can be stabilized.

[0225] Fig.15 A. Fig.15 The circuit interrupting device 100 according to the modification example 8 shown in FIG. 1B is different from the circuit interrupting device 100 according to the modification example 7 in that the second yoke 62 is fixed to the housing 7 .

[0226] Specifically, the second yoke 62 of the modification 8 is cylindrical with an axis in the vertical direction, and is fixed to the cover member 73 in a manner to surround the portion of the pyrotechnic actuator 5 protruding from the cover member 73. The portion of the lower surface of the second yoke 62 in the front-to-back direction faces the pair of protruding portions 611 and 612 of the first yoke 61 (see Fig.15 B). The other structures in the modification example 8 are the same as those of the circuit disconnection device 100 in the modification example 7, and therefore illustration and detailed description are omitted.

[0227] Even in the structure of Modification 8, as in Modification 7, the first yoke 61 and the second yoke 62 generate a force for maintaining the connection between the first movable contact 31 and the second movable contact 32 and the first fixed contact 11 and the second fixed contact 21. Thus, it is possible to stabilize the connection state between the movable contact 31 and the fixed contact 11. In Modification 8, the second yoke 62 may be fixed to the housing 52 of the pyrotechnic actuator 5.

[0228] In addition, you can also Fig.16 As shown in the modification 9, the circuit disconnecting device 100 has only the first yoke 61 and does not have the second yoke 62. In addition, as long as the movable contact 31 and the fixed contact 11 can be stably connected by overcoming the electromagnetic repulsive force by the holding portion 4 or the like, the circuit disconnecting device 100 may not have both the first yoke 61 and the second yoke 62. (2.4.3)

[0230] In the circuit interrupting device 100, by appropriately designing the routing path of the current before or after the current flows through the movable contact 3, the connection state between the movable contact 31 and the fixed contact 11 can be stabilized. The circuit interrupting device 100 of Modifications 10 and 11 having such a structure will be described.

[0231] like Fig.17 A. Fig.17 As shown in FIG. 1B , the circuit chip 140 of the first fixed terminal 1 of the circuit disconnection device 100 of Modification 10 includes a first circuit chip 1401, a second circuit chip 1402, a third circuit chip 1403, and a fourth circuit chip 1404. In addition, the circuit chip 240 of the second fixed terminal 2 includes a first circuit chip 2401, a second circuit chip 2402, a third circuit chip 2403, and a fourth circuit chip 2404.

[0232] like Fig.17As shown in A, the first circuit sheet 1401 of the first fixed terminal 1 is a plate-shaped sheet having thickness in the front-to-back direction and extending to the left from the left surface of the connecting sheet 130. The second circuit sheet 1402 is connected to the first circuit sheet 1401, has thickness in the up-down direction, and is arranged on the left side of the housing 7 in a manner extending from the left end of the first circuit sheet 1401 to the rear. The third circuit sheet 1403 is connected to the second circuit sheet 1402, has thickness in the front-to-back direction, and is arranged on the rear side of the housing 7 in a manner extending downward from the rear end of the second circuit sheet 1402. The fourth circuit sheet 1404 is connected to the third circuit sheet 1403, has thickness in the front-to-back direction, and is arranged on the rear side of the housing 7 in a manner extending to the right from the lower end of the third circuit sheet 1403. That is, the fourth circuit sheet 1404 is electrically connected to the fixed contact (first fixed contact) 11, and extends along the direction (left-right direction) of the current flowing through the movable contact 3. The thickness direction (front-rear direction) of fourth circuit sheet 1404 is orthogonal to the direction (up-down direction) in which movable contact 31 and fixed contact 11 are opposed to each other.

[0233] The first circuit sheet 2401 of the second fixed terminal 2 is a plate-shaped sheet having thickness in the front-to-back direction and extending rightward from the right surface of the connecting sheet 230. The second circuit sheet 2402 is connected to the first circuit sheet 2401, has thickness in the up-down direction, and is arranged on the right side of the housing 7 in a manner extending forward from the right end of the first circuit sheet 2401. The third circuit sheet 2403 is connected to the second circuit sheet 2402, has thickness in the front-to-back direction, and is arranged in front of the housing 7 in a manner extending downward from the front end of the second circuit sheet 2402. The fourth circuit sheet 2404 is connected to the third circuit sheet 2403, has thickness in the front-to-back direction, and is arranged in front of the housing 7 in a manner extending leftward from the lower end of the third circuit sheet 2403. That is, the fourth circuit sheet 2404 is electrically connected to the fixed contact (first fixed contact) 11, and extends in the direction (left-right direction) of the current flowing through the movable contact 3. The thickness direction (front-rear direction) of fourth circuit sheet 2404 is orthogonal to the direction (up-down direction) in which movable contact 31 and fixed contact 11 are opposed to each other.

[0234] like Fig.17 As shown in B, the movable contact 3 is located between the fixed contact (first fixed contact) 11 and the fourth circuit sheet 1404 when viewed from the front-to-back direction. In addition, the movable contact 3 is located between the fixed contact (first fixed contact) 11 and the fourth circuit sheet 2404 when viewed from the front-to-back direction. The fourth circuit sheet 1404 of the first fixed terminal 1 and the fourth circuit sheet 2404 of the second fixed terminal 2 are opposite in the front-to-back direction.

[0235] That is, in the circuit disconnection device 100 of the modification 10, in the direction in which the first movable contact 31 and the first fixed contact 11 are opposite to each other, the movable contact 3 is located between the fourth circuit sheet 1404 and the first fixed contact 11. The direction of the current flowing through the fourth circuit sheet 1404 is opposite to the direction of the current flowing through the movable contact 3. In addition, in the direction in which the first movable contact 31 and the first fixed contact 11 are opposite to each other, the movable contact 3 is located between the fourth circuit sheet 2404 and the first fixed contact 11. The direction of the current flowing through the fourth circuit sheet 2404 is opposite to the direction of the current flowing through the movable contact 3.

[0236] Therefore, repulsive force is generated between the movable contact 3 and the fourth circuit chip 1404 and between the movable contact 3 and the fourth circuit chip 2404. The repulsive force is a force exerted on the current flowing through the movable contact 3 and the fourth circuit chips 1404 and 2404 by the Lorentz force. The fourth circuit chips 1404 and 2404 are fixed relative to the housing 7, so the movable contact 3 is exerted with a force in a direction away from the fourth circuit chips 1404 and 2404 ( Fig.17 Thus, the connection state between movable contact 31 and fixed contact 11 can be stabilized.

[0237] You can also Fig.18 As shown in the modification 11, in a structure where the circuit connecting the first electrode 12 and the second electrode 22 has only one set of movable contact 31 and fixed contact 11, the first fixed terminal 1 has the fourth circuit sheet 1404. Alternatively, the second fixed terminal 2 may have the fourth circuit sheet 2404.

[0238] In addition, the winding shape of the circuit chip is not limited to the winding shape shown in the figure. For example, the circuit chip 140 may be wound inside the housing 7 (the circuit chip (the fourth circuit chip) 1404 through which the current flows in the opposite direction to the movable contact 3 is arranged inside the housing 7). (2.4.4)

[0240] Fig.19 The circuit disconnecting device 100 of the modification 12 shown includes a bimetal 65 that bends due to a temperature rise and presses the movable contact 3 in a direction from the movable contact (first movable contact) 31 toward the fixed contact (first fixed contact) 11 .

[0241] Specifically, the circuit disconnection device 100 of the modification 12 includes a pair of plate-shaped bimetallic members 65. The base of the bimetallic member 65 is embedded in the side surface of the housing body 710, and the top end is in contact with the lower surface of the movable contact 3. In the circuit disconnection device 100 of the modification 12, if an overcurrent such as a short-circuit current flows through the movable contact 3, the bimetallic member 65 is heated by the overcurrent and presses the movable contact 3 in the direction (upward) toward the first fixed terminal 1 and the second fixed terminal 2. Thus, the connection state between the movable contact 31 and the fixed contact 11 can be stabilized.

[0242] In addition, since the other structures in the modification 12 are the same as those of the circuit disconnection device 100 of the embodiment, illustration and detailed description are omitted. (2.4.5)

[0244] The magnitude of the electromagnetic repulsive force depends on the current flowing through the connection portion between the movable contact 3 and the fixed terminal 1. Therefore, if the number of connection portions between the movable contact 3 and the fixed terminal 1 is multiple, the current flowing through each connection portion can be reduced, thereby reducing the electromagnetic repulsive force. For example, if multiple movable contacts 3 are arranged in parallel between the first fixed terminal 1 and the second fixed terminal 2, the magnitude of the current flowing through each movable contact 3 becomes smaller, thereby reducing the electromagnetic repulsive force applied to each connection portion.

[0245] As in Fig. 20 As schematically shown in FIG. 1 , the circuit disconnecting device 100 of Modification 13 and Modification 14 includes a plurality of movable contacts 3 each having a movable contact (first movable contact) 31. The fixed terminal (first fixed terminal) 1 includes a plurality of fixed contacts (first fixed contacts) 11. The plurality of movable contacts (first movable contacts) 31 are connected to the plurality of fixed contacts (first fixed contacts) 11 in a one-to-one correspondence.

[0246] exist Fig.21 , Fig. 22 A. Fig. 22 B shows the main part of the circuit disconnection device 100 of the modification 13.

[0247] like Fig.21 As shown, the circuit disconnecting device 100 according to the modification 13 includes a plurality of movable contacts 3 (a first movable contact 301 and a second movable contact 302 ) and an electrically insulating holding body 36 .

[0248] like Fig.21 , Fig. 22 As shown in A, the plurality of movable contacts 3 are all in the shape of plates that are long in the left-right direction, and have a first movable contact 31 on the upper surface of the left end and a second movable contact 32 on the upper surface of the right end. Fig. 22As shown in A, the first movable contact 301 has a first movable contact 311 on the upper surface of the left end, and a second movable contact 312 on the upper surface of the right end. The second movable contact 302 has a first movable contact 321 on the upper surface of the left end, and a second movable contact 322 on the upper surface of the right end. In addition, on the lower surface of the first fixed terminal 1, the portions that contact with the first movable contacts 31 of the plurality of movable contacts 3 are the first fixed contacts 11, respectively. On the lower surface of the second fixed terminal 2, the portions that contact with the second movable contacts 32 of the plurality of movable contacts 3 are the second fixed contacts 21, respectively.

[0249] The retaining body 36 is formed of an insulating material such as resin into a rectangular parallelepiped shape extending in the front-rear direction. The retaining body 36 retains a plurality of movable contacts 3 (a first movable contact 301 and a second movable contact 302). The first movable contact 301 penetrates the rear end portion ( Fig. 22 The second movable contact 302 penetrates the front end portion ( Fig. 22 The center in the vertical direction of the lower end of A). Fig.21 As shown, the upper surface of the retaining body 36 is opposite to the second end 532 of the piston 53 of the pyrotechnic actuator 5. Fig. 22 A. Fig. 22 As shown in FIG. 8B , a fitting recess 360 for receiving the second end 412 of the pressure contact spring 41 is formed on the lower surface of the holding body 36 .

[0250] In addition, since the other structures in the modification 13 are the same as those of the circuit disconnecting device 100 of the embodiment, illustration and detailed description are omitted.

[0251] In the circuit disconnecting device 100 of the modification 13, when the retaining body 36 is pressed by the piston 53, the plurality of first movable contacts 31 are (substantially) simultaneously pulled away from the first fixed contact 11, and the plurality of second movable contacts 32 are (substantially) simultaneously pulled away from the second fixed contact 21.

[0252] By arranging the plurality of movable contacts 3 in parallel between the first fixed terminal 1 and the second fixed terminal 2 in this manner, it is possible to reduce the electromagnetic repulsive force applied to each connection portion.

[0253] In addition, from the viewpoint of reducing the electromagnetic repulsive force, it is more preferred that the material of the contact group composed of the movable contact 31 and the fixed contact 11 is the same among the plurality of contact groups. That is, it is preferred that the plurality of first movable contacts 31 (the first movable contact 311 of the first movable contact 301 and the first movable contact 321 of the second movable contact 302) are formed of the same material. In addition, it is preferred that the plurality of second movable contacts 32 (the second movable contact 312 of the first movable contact 301 and the second movable contact 322 of the second movable contact 302) are formed of the same material. Moreover, it is preferred that the plurality of first movable contacts 31 and the plurality of second movable contacts 32 are also formed of the same material. If the materials are the same among the plurality of contact groups, the current can be evenly distributed to the plurality of movable contacts 3 arranged in parallel, and the electromagnetic repulsive force acting on each connection portion can be further reduced.

[0254] However, the material of the contact group composed of the movable contact 31 and the fixed contact 11 may be different between the plurality of contact groups. That is, the plurality of movable contacts (plural first movable contacts) 31 (the first movable contact 311 of the first movable contact 301 and the first movable contact 321 of the second movable contact 302) may also be formed of different materials. Even in this case, the current can be distributed to the plurality of movable contacts 3 arranged in parallel, thereby reducing the electromagnetic repulsion acting on each connection portion.

[0255] exist Fig.23 A. Fig.23 B shows the main part of the circuit disconnection device 100 of Modification 14. The structure of the retaining body 36 of the circuit disconnection device 100 of Modification 14 is different from that of Modification 13. In addition, the other structures in Modification 14 are the same as those of the circuit disconnection device 100 of Modification 13, so the illustration and detailed description are omitted.

[0256] The holding body 36 of the modification 14 includes a first member 361 and a second member 362 each formed of an insulating material such as resin.

[0257] The first member 361 is formed to extend in the front-rear direction ( Fig.23 The first member 361 has a rear end portion ( Fig.23 The upper end of A, Fig.23 The left end portion of B) is a rectangular parallelepiped portion 3611 and a plate portion 3612 protruding forward from the rectangular parallelepiped portion 3611. A recessed portion recessed upward is formed in the central portion of the plate portion 3612 in the front-to-back direction.

[0258] The second member 362 is formed in the front-rear direction ( Fig.23The second member 362 has a front end portion ( Fig.23 The lower end of A, Fig.23 The second member 362 has a rectangular parallelepiped portion 3621 and a plate portion 3622 protruding rearward from the rectangular parallelepiped portion 3621. The lower surface of the plate portion 3622 of the second member 362 is formed with a fitting recess 360 for receiving the second end 412 of the crimping spring 41. Fig.23 A recessed portion is formed on the left surface of B for inserting the front end of the plate portion 3612 of the first member 361. Fig.23 A pressing portion 3613 is formed at the left end of B in a manner opposite to the plate portion 3612 across the rear end of the plate portion 3612 of the first member 361. A protrusion protruding upward is formed at a position opposite to the recess of the plate portion 3612 of the first member 361 in the central portion in the front-to-back direction of the plate portion 3612. The coil spring 37 is sleeved on the protrusion to apply force to the first member 361 upward (towards the direction away from the second member 362). As a result, the retaining body 36 is retained by the retaining portion 4 (crimping spring 41) in a state where the upper surface of the plate portion 3612 of the first member 361 is in contact with the second member 362 and the lower surface of the plate portion 3612 of the first member 361 is away from the second member 362.

[0259] The upper surface of the central portion of the plate portion 3612 of the first member 361 ( Fig.23 The upper surface of B) is opposite to the second end 532 of the piston 53 of the pyrotechnic actuator 5.

[0260] In the circuit disconnection device 100 of the modification 14, if the central portion of the plate portion 3612 of the first member 361 of the retaining body 36 is pressed downward by the piston 53, first, the coil spring 37 is compressed while only the first member 361 is moved downward. As a result, the first movable contact 301 moves downward, and the first movable contact 311 and the second movable contact 312 of the first movable contact 301 are pulled away from the first fixed contact 11 and the second fixed contact 21. If the piston 53 moves further downward, the spring 37 is further compressed, and the lower surface of the first member 361 contacts the upper surface of the second member 362. As a result, the second member 362 is pressed by the first member 361 and also moves downward, and the second movable contact 302 also moves downward. As the second movable contact 302 moves downward, the first movable contact point 321 and the second movable contact point 322 of the second movable contact 302 are pulled apart from the first fixed contact point 11 and the second fixed contact point 21 .

[0261] That is, in the circuit disconnecting device 100 of the fourteenth modification, the plurality of movable contacts (the first movable contact 311 of the first movable contact 301 and the first movable contact 321 of the second movable contact 302 ) are pulled apart from the plurality of fixed contacts 11 at different timings.

[0262] In this case, it is more preferred that the material of the contact group consisting of the movable contact 31 and the fixed contact 11 is different between the plurality of contact groups. That is, it is preferred that the plurality of first movable contacts 31 (the first movable contact 311 of the first movable contact 301 and the first movable contact 321 of the second movable contact 302) are formed of different materials. In addition, it is preferred that the plurality of second movable contacts 32 (the second movable contact 312 of the first movable contact 301 and the second movable contact 322 of the second movable contact 302) are formed of different materials. The first movable contact 31 and the second movable contact 32 (for example, the first movable contact 311 and the second movable contact 312 of the first movable contact 301) provided in one movable contact 3 may be formed of the same material or of different materials.

[0263] In more detail, the first movable contact 311 and the second movable contact 312 of the first movable contact 301 that is first pulled away from the first fixed contact 11 are preferably formed of a material with a relatively low resistance (e.g., copper). In addition, the first movable contact 321 and the second movable contact 322 of the second movable contact 302 that is later pulled away from the first fixed contact 11 are preferably formed of a material with a relatively high arc resistance (e.g., tungsten alloy). If it is this structure, an arc will (almost) not be generated between the first movable contact 311 of the first movable contact 301 that is first pulled away from the first fixed contact 11 and the first fixed contact 11 (and between the second movable contact 312 and the second fixed contact 21). Therefore, the arc resistance when viewed from the circuit disconnection device 100 as a whole can be improved. In addition, when energized, the current can flow through the path on the side of the first movable contact 301 with a relatively low resistance, so the energization performance can also be improved.

[0264] In Modification 13 and Modification 14, when the first fixed contact 11 is formed of a member independent of the connection piece 110, two or more first movable contacts 31 may be connected to one first fixed contact 11. Similarly, when the second fixed contact 21 is formed of a member independent of the connection piece 210, two or more second movable contacts 32 may be connected to one second fixed contact 21. (2.4.6)

[0266] Alternatively, one of the movable contact (first movable contact) 31 and the fixed contact (first fixed contact) 11 may be used as the first contact, and the other may be used as the second contact, and the circuit disconnection device 100 may include a plurality of second contacts. In the circuit disconnection device 100, a plurality of second contacts may be connected to one first contact.

[0267] exist Fig.24 A shows the main part of the circuit disconnection device 100 of the modification 15. The structure of the movable contact 3 of the circuit disconnection device 100 of the modification 15 is different from that of the embodiment. The other structures in the modification 15 are the same as those of the circuit disconnection device 100 of the embodiment, so the illustration and detailed description are omitted.

[0268] like Fig.24 As shown in A, the movable contact 3 has two first movable contacts 31 and two second movable contacts 32. The two first movable contacts 31 are respectively in contact with the lower surface (first fixed contact 11) of the connecting piece 110 of the first fixed terminal 1. The two second movable contacts 32 are respectively in contact with the lower surface (second fixed contact 21) of the connecting piece 210 of the second fixed terminal 2. That is, in this modification, the two movable contacts (first movable contacts) 31 as the two second contacts are connected to one fixed contact (first fixed contact) 11 as the first contact.

[0269] In this way, by providing a plurality of movable contacts (first movable contacts) 31 on the movable contact 3, the number of connecting locations between the fixed terminal (first fixed terminal) 1 and the movable contact 3 is set to be multiple, thereby reducing the electromagnetic repulsion force at each connecting location. In addition, by providing a plurality of second movable contacts 32 on the movable contact 3, the number of connecting locations between the second fixed terminal 2 and the movable contact 3 is set to be multiple, thereby reducing the electromagnetic repulsion force at each connecting location. In addition, it is also possible to Fig.24 As shown in FIG. 1B , in the movable contact 3, only one of the first movable contact 31 and the second movable contact 32 (in Fig.24 In the example of B, the second movable contact 32 is provided in plurality. In addition, in this modification, the movable contact 3 is held by the electrically insulating holding body 36, but the holding body 36 may not be provided.

[0270] exist Fig.25 A shows the main part of the circuit disconnection device 100 of the modification 16. The structure of the first fixed terminal 1 and the second fixed terminal 2 of the circuit disconnection device 100 of the modification 16 is different from that of the embodiment. The other structures in the modification 16 are the same as those of the circuit disconnection device 100 of the embodiment, so the illustration and detailed description are omitted.

[0271] like Fig.25As shown in A, the first fixed terminal 1 has two first fixed contacts 11. The second fixed terminal 2 has two second fixed contacts 21. In this modification, for example, each fixed contact (first fixed contact 11, second fixed contact 21) is formed by a member independent of the first fixed terminal 1 or the second fixed terminal 2, and is fixed to the connecting piece 110 or 210. The two fixed contacts (first fixed contacts) 11 are respectively in contact with the movable contact (first movable contact) 31 of the movable contact 3. The two second fixed contacts 21 are respectively in contact with the second movable contact 32 of the movable contact 3. That is, in this modification, the two fixed contacts (first fixed contacts) 11 as the two second contacts are connected to the one movable contact (first movable contact) 31 as the first contact.

[0272] In this way, by providing a plurality of fixed contacts (first fixed contacts) 11 on the fixed terminal (first fixed terminal) 1, the number of connecting portions between the fixed terminal (first fixed terminal) 1 and the movable contact 3 is set to be multiple, thereby reducing the electromagnetic repulsion force at each connecting portion. In addition, by providing a plurality of second fixed contacts 21 on the second fixed terminal 2, the number of connecting portions between the second fixed terminal 2 and the movable contact 3 is set to be multiple, thereby reducing the electromagnetic repulsion force at each connecting portion. In addition, as Fig.25 As shown in B, one of the first fixed terminal 1 and the second fixed terminal 2 may include a plurality of fixed terminals (the first fixed terminal 1 or the second fixed terminal 2).

[0273] Alternatively, it can be, Fig.24 As shown in A, a plurality of fixed contacts (first fixed contacts) 11 are provided on the fixed terminal (first fixed terminal) 1, as shown in FIG. Fig.25 As shown in A, a plurality of movable contacts (first movable contacts) 31 are provided on the movable contact 3, and the plurality of movable contacts are connected to a plurality of fixed contacts. In this case as well, by providing a plurality of connection locations between the fixed terminal (first fixed terminal) 1 and the movable contact 3, the electromagnetic repulsive force at each connection location can be reduced. The relationship between the second movable contact 32 and the second fixed contact 21 is also the same.

[0274] In the circuit disconnecting devices 100 of the fifteenth and sixteenth modifications, the material of the contact group can be appropriately selected similarly to the case of the thirteenth modification. (2.4.7)

[0276] The connection state between the movable contact 31 and the fixed contact 11 may be stabilized by increasing the contact pressure between the movable contact (first movable contact) 31 and the fixed contact (first fixed contact) 11 .

[0277] exist Fig.26 A. Fig.26B shows the main part of the circuit disconnecting device 100 of the modification 17. Fig.26 A is a front view of the movable contact 3 of the modification example 17, Fig.26 B is a cross-sectional view showing a portion of the circuit disconnecting device 100 according to Modification 17 where the movable contact 3 is disposed between the fixed terminal 1 and the second fixed terminal 2. Fig.26 In B, the pyrotechnic actuator 5 and the like are omitted from illustration. In addition, the other structures in the circuit disconnection device 100 of the modification 17 are the same as those in the embodiment, and therefore illustration and detailed description are omitted.

[0278] like Fig.26 As shown in FIG. 1B , in the circuit disconnecting device 100 of this modified example, the movable contact 3 is clamped (pressed) between the first fixed terminal 1 and the second fixed terminal 2 in such a manner that the first movable contact 31 contacts the first fixed contact 11 and the second movable contact 32 contacts the second fixed contact 21. Thus, the connection state between the movable contact 31 and the fixed contact 11 can be stabilized.

[0279] exist Fig. 27 A. Fig. 27 B shows the main part of the circuit disconnection device 100 of the modification 18. Fig. 27 A is a front view of the movable contact 3 of the modification example 18, Fig. 27 B is a cross-sectional view showing a portion of the circuit disconnecting device 100 according to Modification 18 where the movable contact 3 is disposed between the fixed terminal 1 and the second fixed terminal 2. Fig. 27 In B, the pyrotechnic actuator 5 and the like are omitted from illustration. In addition, the other structures in the circuit disconnection device 100 of the modification 18 are the same as those in the embodiment, and therefore illustration and detailed description are omitted.

[0280] like Fig. 27 As shown in FIG. 1B , in the circuit disconnecting device 100 of this modified example, the relative orientation of the first fixed contact 11 and the first movable contact 31 is opposite to the relative orientation of the second fixed contact 21 and the second movable contact 32. Thus, the connection between the movable contact 31 and the fixed contact 11 can be further stabilized.

[0281] In addition, the first movable contact (movable contact) 31 may also be welded to the first fixed contact (fixed contact) 11. In addition, the second movable contact 32 may also be welded to the second fixed contact 21. For example, when the first movable contact 31 is in contact with the first fixed contact 11 and the second movable contact 32 is in contact with the second fixed contact 21, a current (for example, about 2000A) flows between the first electrode 12 and the second electrode 22, thereby welding the movable contact and the fixed contact in contact. By welding, the contact surface between the first movable contact (movable contact) 31 and the first fixed contact (fixed contact) 11 (the contact surface between the second movable contact 32 and the second fixed contact 21) becomes larger, and the contact pressure increases.

[0282] (2.5) Modification 19 to Modification 21

[0283] The direction in which the movable contact 3 moves may be different from the direction in which the piston 53 moves. In other words, the direction in which the movable contact 3 moves may be a direction that intersects the direction in which the piston 53 moves. For example, the direction in which the movable contact 3 moves may be a direction that is substantially orthogonal to the direction in which the piston 53 moves. A modified example having this structure is described below. (2.5.1)

[0285] Reference Fig.28 A~ Fig.29 A circuit disconnecting device 100 according to Modification 19 will be described. Fig.28 A is a cross-sectional view of the main part of the circuit disconnection device 100 as viewed from above, Fig.28 B is a cross-sectional view of a main part of the circuit disconnecting device 100 as viewed from the side. Fig.28 Detailed description C is a perspective view of the piston 53 according to the present modification. Fig.29 This is a cross-sectional view of the main part of the circuit disconnecting device 100 after operation, as seen from the side.

[0286] like Fig.28 As shown in A, the circuit disconnecting device 100 of this modified example includes a housing 7, an igniter 51, a shell 52, a piston 53, a fixed terminal (first fixed terminal) 1, a second fixed terminal 2, a movable contact 3, and a crimping spring 41 (holding portion 4).

[0287] The first fixed terminal 1 and the second fixed terminal 2 are formed in the left-right direction ( Fig.28 The up and down direction of A; Fig.28 The first fixed terminal 1 and the second fixed terminal 2 are arranged in a manner of being arranged in the left-right direction. At the top end of the first fixed terminal 1 ( Fig.28 A first fixed contact (fixed contact) 11 is provided at the lower end portion of A of the second fixed terminal 2. Fig.28 A second fixed contact 21 is provided at the upper end portion of B.

[0288] The movable contact 3 is formed in a plate shape that is long in the left-right direction. Fig.28 The upper end of A of the invention has a first movable contact (movable contact) 31, and the second end ( Fig.28 The lower end of A of the first movable contact 31 has a second movable contact 32. The first fixed terminal 1, the second fixed terminal 2 and the movable contact 3 are arranged in such a manner that the first movable contact 31 faces the first fixed contact 11 and the second movable contact 32 faces the second fixed contact 21.

[0289] The contact pressure spring 41 presses the movable contact 3 backward (ie, Fig.28 That is, the contact pressure spring 41 applies force to the movable contact 3 in the direction in which the first movable contact 31 is connected to the first fixed contact 11 and the second movable contact 32 is connected to the second fixed contact 21.

[0290] The igniter 51 is accommodated in the housing 52. The housing 52 is arranged above the movable contact 3. The housing 52 of this modification is formed in a cylindrical shape. An opening for exposing the needle electrode 514 of the igniter 51 is formed on the upper surface of the housing 52. A hole for releasing the gas generated by the combustion part 513 of the igniter 51 is formed on the lower surface of the housing 52. Inside the housing 52, a space (pressurized chamber 520) is formed below the igniter 51.

[0291] The piston 53 is disposed between the housing 52 (igniter 51) and the movable contact 3 in the vertical direction. The piston 53 has a plate portion 537 and a wedge portion 538. The plate portion 537 is a rectangular plate having a length in the left-right direction and is located at the upper end of the piston 53. The wedge portion 538 is a so-called wedge-shaped, and its cross-sectional shape is a trapezoidal shape obtained by connecting right triangles on the lower side of a rectangle. The wedge portion 538 extends from the front side of the lower surface of the plate portion 537 ( Fig.28 The wedge portion 538 is on the front surface ( Fig.28 The lower part of the left side surface of B) has an inclined surface inclined backward. That is, the wedge portion 538 is formed to be thicker ( Fig.28 The lower end of the piston 53 (the top of the wedge 538) is shaped like a column with a smaller size in the left-right direction of B. Fig.28 In the left-right direction of B), it is located between the movable contact 3 and the first fixed terminal 1 (the second fixed terminal 2).

[0292] The housing 7 is formed into a rectangular box having an internal space (accommodation chamber 70 ). The internal space of the housing 7 accommodates the top end of the fixed terminal (first fixed terminal) 1, the top end of the second fixed terminal 2, the movable contact 3, the crimping spring 41, the housing 52 and the piston 53.

[0293] The internal space of the housing 7 includes first to fourth spaces.

[0294] The first space is a cylindrical space that is long vertically. A housing 52 is disposed in the first space so as to close an opening on the upper side of the first space.

[0295] The second space is located below the first space and is a rectangular space that is longer in the vertical direction. The piston 53 is arranged in the second space in such a manner that its upper surface (the upper surface of the plate portion 537) is opposite to the hole of the housing 52. On a plane orthogonal to the vertical direction, the cross-sectional shape of the second space is the same as the shape of the plate portion 537 of the piston 53. In other words, the piston 53 is arranged in the second space in such a manner as to block the second space of the housing 7.

[0296] The third space is located below the second space and is a rectangular space that is longer in the left and right directions. The movable contact 3, the top end of the first fixed terminal 1 (including the first fixed contact 11) and the top end of the second fixed terminal 2 (including the second fixed contact 21) are arranged in the third space.

[0297] The fourth space is located in front of the third space and is a cylindrical space that is long in the front-rear direction. A pressure contact spring 41 is arranged in the fourth space.

[0298] In this modified example, when the igniter 51 generates gas, the pressure in the pressurized chamber 520 increases, and the piston 53 is pressed downward by the increased pressure. As the piston 53 moves downward, the wedge portion 538 enters between the movable contact 3 and the first fixed terminal 1 (and between the movable contact 3 and the second fixed terminal 2), and moves forward ( Fig.28 B to the left) presses the movable contact 3 (refer to Fig.29 ). As a result, the first movable contact 31 is pulled away from the first fixed contact 11, and the second movable contact 32 is pulled away from the second fixed contact 21. The moved piston 53 is physically interposed between the movable contact 3 and the fixed terminal 1. In addition, in this modification, the direction in which the movable contact 3 moves (forward) is orthogonal to the direction in which the piston 53 moves (downward).

[0299] In this modification, the upper surface of the plate portion 537 of the piston 53 is the first end 531 that receives the pressure in the pressurizing chamber 520 , and the wedge portion 538 of the piston 53 is the second end 532 that presses the movable contact 3 .

[0300] In this modified example, the energy of the gas generated by the igniter 51 is used to move the movable contact 3 relative to the fixed terminal (first fixed terminal) 1, thereby disconnecting the circuit. Therefore, the arc generated between the contacts is rapidly elongated and extinguished at a speed equal to the moving speed of the movable contact 3. As a result, the circuit disconnection device 100 can extinguish the arc in a short time, and can improve the current disconnection performance.

[0301] In addition, the length of the piston 53 (with Fig.28 The dimension of the B in the direction perpendicular to the paper surface) is preferably longer than the distance between the first fixed contact 11 and the second fixed contact 21, and is preferably equal to the length of the movable contact 3. In this case, when the piston 53 moves downward, the rear side of the lower surface of the plate portion 537 contacts the upper surface of the first fixed terminal 1 and the second fixed terminal 2, preventing the piston 53 from moving further downward (see Fig.29 ). Thus, the piston 53 can be held at a position between the movable contact 3 and the first and second fixed terminals 1 and 2 .

[0302] In addition, the shape of the piston 53 is not limited to Fig.28 The piston 53 may be in the shape of a C, for example, only the wedge portion 538 may be provided. Alternatively, the front and rear surfaces of the wedge portion 538 may be provided with inclined surfaces that are inclined so as to approach each other as they go downward, and the piston 53 may be formed in a triangular prism shape. Of course, shapes other than these are also possible.

[0303] The circuit disconnecting device 100 of the present modification example may also include the first yoke 61 , the second yoke 62 , a non-return mechanism, and the like as appropriate, similarly to the embodiment. (2.5.2)

[0305] Reference Fig.30 A~ Fig.31 A circuit disconnecting device 100 according to Modification 20 will be described. Fig.30 A is a cross-sectional view of the main part of the circuit disconnection device 100 as viewed from above, Fig.30 B is a cross-sectional view of a main part of the circuit disconnecting device 100 as viewed from the side. Fig.30 Detailed description C is a perspective view of the piston 53 according to the present modification. Fig.31 1 is a cross-sectional view of the main part of the circuit interruption device 100 after operation, as seen from the side. In the circuit interruption device 100 of this modification, the same reference numerals are used for the same configurations as those of the modification 19, and description thereof is omitted as appropriate.

[0306] The circuit disconnecting device 100 of this modification includes two movable contacts 3 (a first movable contact 301 and a second movable contact 302) arranged in parallel. The two movable contacts 3 move in different directions.

[0307] like Fig.30 As shown in A, the two movable contacts 3 (the first movable contact 301 and the second movable contact 302) are respectively in the left and right directions ( Fig.30 The up and down direction of A; Fig.30 Each movable contact 3 is in the shape of a plate that is longer in the direction perpendicular to the paper surface of B. Fig.30 The first movable contact 31 is provided on one side of the upper end portion of A, and the first movable contact 31 is provided on the right end portion ( Fig.30 A side of the lower end portion of A) has a second movable contact 32. Specifically, as Fig.30 As shown in A, the first movable contact 301 has a rear surface ( Fig.30 The second movable contact 302 has a first movable contact 311 on the front surface of the left end ( Fig.30 A left surface of A has a first movable contact 321, and a front surface of the right end has a second movable contact 322.

[0308] In addition, a first fixed contact 111 (11) connected to the first movable contact 311 of the first movable contact 301 is provided on the front surface of the top end portion of the first fixed terminal 1. A first fixed contact 112 (11) connected to the first movable contact 321 of the second movable contact 302 is provided on the rear surface of the top end portion of the first fixed terminal 1. A second fixed contact 211 (21) connected to the second movable contact 312 of the first movable contact 301 is provided on the front surface of the top end portion of the second fixed terminal 2. A second fixed contact 212 (21) connected to the second movable contact 322 of the second movable contact 302 is provided on the rear surface of the top end portion of the second fixed terminal 2.

[0309] A contact pressure spring 41 (first contact pressure spring 411) is provided between the first movable contact 301 and the housing 7. The first contact pressure spring 411 acts to push the first movable contact 301 backward ( Fig.30 That is, the first movable contact 301 is urged by the first contact pressure spring 411 in a direction such that the first movable contact 311 is connected to the first fixed contact 111 and the second movable contact 312 is connected to the second fixed contact 211.

[0310] A contact pressure spring 41 (second contact pressure spring 412) is provided between the second movable contact 302 and the housing 7. The second contact pressure spring 412 presses the second movable contact 302 forward ( Fig.30 That is, the second movable contact 302 is urged by the second contact pressure spring 412 in a direction such that the first movable contact 321 is connected to the first fixed contact 112 and the second movable contact 322 is connected to the second fixed contact 212.

[0311] The first contact pressure spring 411 and the second contact pressure spring 412 urge the corresponding movable contact 3 in opposite directions. The first contact pressure spring 411 and the second contact pressure spring 412 urge the corresponding movable contact 3 in a direction in which the movable contacts 3 approach each other.

[0312] The piston 53 of this modified example includes a plate portion 537, a first wedge portion 5381, and a second wedge portion 5382. The plate portion 537 is a rectangular plate having a length in the left-right direction and is located at the upper end of the piston 53. The first wedge portion 5381 is a so-called wedge-shaped portion. The first wedge portion 5381 extends from the front side of the lower surface of the plate portion 537 ( Fig.30 The first wedge portion 5381 is on the front surface ( Fig.30 The lower part of the left side surface of B) has an inclined surface inclined backward. That is, the first wedge portion 5381 is formed to have a thickness ( Fig.30 The top of the first wedge 5381 is in the front-to-back direction ( Fig.30 The second wedge portion 5382 is located between the first movable contact 301 and the first fixed terminal 1 (the second fixed terminal 2) in the left-right direction of B. The second wedge portion 5382 is a so-called wedge-shaped portion. The second wedge portion 5382 extends from the rear side of the lower surface of the plate portion 537 ( Fig.30 The second wedge portion 5382 is on the rear surface ( Fig.30 The lower part of the right side surface of B) has an inclined surface inclined forward. That is, the second wedge portion 5382 is formed to have a thickness ( Fig.30 The top of the second wedge 5382 is in the front-to-back direction ( Fig.30 The movable contact 302 is located between the second movable contact 302 and the first fixed terminal 1 (the second fixed terminal 2) in the left-right direction of B.

[0313] The igniter 51 and the housing 52 are the same as those of the circuit interrupting device 100 of the nineteenth modification.

[0314] The top end of the fixed terminal (first fixed terminal) 1, the top end of the second fixed terminal 2, the first movable contact 301, the second movable contact 302, the first pressure contact spring 411, the second pressure contact spring 412, the housing 52 and the piston 53 are accommodated in the internal space of the housing 7.

[0315] In this modified example, when the igniter 51 generates gas, the pressure in the pressurized chamber 520 increases, and the increased pressure is used to press the piston 53 downward. As the piston 53 moves downward, the first wedge portion 5381 enters between the first movable contact 301 and the first fixed terminal 1 (and between the first movable contact 301 and the second fixed terminal 2), and moves forward ( Fig.30 The first movable contact 301 is pressed by the piston 53 (the first movable contact 311 is pulled away from the first fixed contact 111, and the second movable contact 312 is pulled away from the second fixed contact 211). In addition, as the piston 53 moves downward, the second wedge 5382 enters between the second movable contact 302 and the first fixed terminal 1 (and between the second movable contact 302 and the second fixed terminal 2), and moves backward ( Fig.30 B to the right) presses the second movable contact 302 (refer to Fig.31 ). As a result, the first movable contact 321 is pulled away from the first fixed contact 112 , and the second movable contact 322 is pulled away from the second fixed contact 212 .

[0316] In this modification, the direction in which the movable contact 3 moves (forward and backward) is orthogonal to the direction in which the piston 53 moves (downward). In addition, in this modification, the two movable contacts 3 (the first movable contact 301 and the second movable contact 302) move in different directions. In particular, in this modification, the two movable contacts 3 are pressed by the piston 53 and move in directions away from each other.

[0317] In the circuit disconnecting device 100 of the present modification as well, the movable contact 31 is quickly pulled away from the fixed contact 11 , so that the arc can be extinguished in a short time, and the current interruption performance can be improved.

[0318] In the circuit disconnecting device 100 of the present modification, two movable contacts 3 are arranged in parallel. The two movable contacts 3 are arranged in a direction in which the movable contact 31 and the fixed contact 11 are opposite to each other ( Fig.30 The two movable contacts 3 (the first movable contact 301 and the second movable contact 302) are arranged so as to sandwich the fixed terminal 1 in the left-right direction of A. In addition, the current in the same direction flows through the two movable contacts 3 (the first movable contact 301 and the second movable contact 302). For example, when the first fixed terminal 1 is at a higher potential than the second fixed terminal 2, the current in the direction from the first fixed terminal 1 to the second fixed terminal 2 flows through each movable contact 3.

[0319] According to the above structure, the magnetic field generated by the current flowing through one movable contact 3 is used to apply a Lorentz force in the direction of one movable contact 3 to the current flowing through the other movable contact 3. Therefore, in this modification, the connection state between the second movable contact 32 and the second fixed contact 21 and the connection state between the first movable contact 31 and the first fixed contact 11 can be stabilized in response to the electromagnetic repulsive force. (2.5.3)

[0321] Reference Fig.32 A~ Fig.33 A circuit disconnecting device 100 according to Modification 21 will be described. Fig.32 A is a cross-sectional view of the main part of the circuit disconnection device 100 as viewed from above, Fig.32 B is a cross-sectional view of a main part of the circuit disconnecting device 100 as viewed from the side. Fig.33 1 is a cross-sectional view of the main part of the circuit interruption device 100 after operation, as seen from the side. In the circuit interruption device 100 of this modification, the same reference numerals are given to the same components as those of the modification 19, and the description thereof is omitted as appropriate.

[0322] The circuit disconnecting device 100 of this modification example includes an additional movable contact 9 which is independent of the movable contact 3 and connected in series with the movable contact 3. The movable contact 3 and the additional movable contact 9 are arranged in parallel. The direction in which the movable contact 3 moves is different from the direction in which the additional movable contact 9 moves. In this modification example, the direction in which the movable contact 3 moves and the direction in which the additional movable contact 9 moves are opposite to each other.

[0323] like Fig.32 As shown in A of FIG. 8 , the circuit disconnecting device 100 of the present modification includes a first fixed terminal 1 , a second fixed terminal 2 , a third fixed terminal 38 , a movable contact 3 , and an additional movable contact 9 .

[0324] The first fixed terminal 1 and the third fixed terminal 38 are formed in the left-right direction ( Fig.30 The up and down direction of A; Fig.30 The second fixed terminal 2 is formed in a rectangular plate shape that is long in a direction perpendicular to the paper surface of B. Fig.28 The A is roughly C-shaped (when viewed in a direction perpendicular to the paper surface of A).

[0325] At the top end of the first fixed terminal 1 ( Fig.32 A first fixed contact (fixed contact) 11 is provided on one side (right surface) of the upper end portion of A of the second fixed terminal 2. Fig.32 The left side of A) Fig.32 The second fixed contact 21 is provided on the right surface of A of the first fixed contact 11. The first fixed contact 11 and the second fixed contact 21 are in the left-right direction ( Fig.32 The components are arranged in an arranged manner (in the up and down direction of A).

[0326] At the other end of the second fixed terminal 2 ( Fig.32 The right side of A) Fig.32 The third fixed contact 23 is provided on the right surface of A of FIG. 38. Fig.32 A fourth fixed contact 381 is provided on one side (left surface) of the upper end portion of A. The third fixed contact 23 and the fourth fixed contact 381 are arranged in the left-right direction ( Fig.32 The components are arranged in an arranged manner (in the up and down direction of A).

[0327] The movable contact 3 is formed in a plate shape that is long in the left-right direction. Fig.32 The lower end of A) has a first movable contact (movable contact) 31, and the second end ( Fig.32 The first fixed terminal 1, the second fixed terminal 2 and the movable contact 3 are arranged so that the first movable contact 31 faces the first fixed contact 11 and the second movable contact 32 faces the second fixed contact 21.

[0328] The additional movable contact 9 is formed in a plate shape that is long in the left-right direction. Fig.32 The upper end of A) has a third movable contact 91, and at the second end ( Fig.32 The lower end of A of the second fixed terminal 2, the third fixed terminal 38 and the additional movable contact 9 are arranged so that the third movable contact 91 is opposite to the third fixed contact 23 and the fourth movable contact 92 is opposite to the fourth fixed contact 381.

[0329] The movable contact 3 and the additional movable contact 9 are electrically connected in series via the second fixed terminal 2 .

[0330] The movable contact 3 and the additional movable contact 9 are arranged parallel to each other. A wall 75 is formed in parallel to the movable contact 3 and the additional movable contact 9 at the center of the bottom surface of the housing 7 .

[0331] Two contact pressure springs 41 (first contact pressure springs 411) are provided between the movable contact 3 and the wall 75. The two first contact pressure springs 411 provide a pressure to the movable contact 3 in the forward direction ( Fig.32 That is, the first movable contact 301 is urged by the two first contact pressure springs 411 in a direction in which the first movable contact 31 is connected to the first fixed contact 11 and the second movable contact 32 is connected to the second fixed contact 21.

[0332] Two contact pressure springs 41 (second contact pressure springs 412) are provided between the additional movable contact 9 and the wall 75. The two second contact pressure springs 412 provide a pressure to the additional movable contact 9 to move backward ( Fig.32 That is, the additional movable contact 9 is urged by the two second pressure contact springs 412 in a direction in which the third movable contact 91 is connected to the third fixed contact 23 and the fourth movable contact 92 is connected to the fourth fixed contact 381.

[0333] The first and second pressure contact springs 411 and 412 urge the movable contact 3 and the additional movable contact 9 in opposite directions. The first and second pressure contact springs 411 and 412 urge the movable contact 3 and the additional movable contact 9 in a direction to separate the movable contact 3 and the additional movable contact 9.

[0334] The piston 53 of this modified example has a plate portion 537, a first wedge portion 538, and a second wedge portion 539. The plate portion 537 is a rectangular plate having a length in the front-to-back direction and is located at the upper end of the piston 53. The first wedge portion 538 is a so-called wedge-shaped portion, and its cross-sectional shape is a right-angled triangle. The first wedge portion 538 extends from the front side of the lower surface of the plate portion 537 ( Fig.32 The first wedge portion 538 is on the rear surface ( Fig.32 The right side of B) has an inclined surface inclined forward. That is, the first wedge portion 538 is formed to have a thickness ( Fig.32 The top of the first wedge portion 538 is in the front-to-back direction ( Fig.32 The second wedge portion 539 is located between the movable contact 3 and the first fixed terminal 1 (the second fixed terminal 2) in the left-right direction of B. The second wedge portion 539 is a so-called wedge-shaped portion, and its cross-sectional shape is a right-angled triangle. The second wedge portion 539 extends from the rear side of the lower surface of the plate portion 537 ( Fig.32 The second wedge portion 539 is on the front surface ( Fig.32 The left side of B) has an inclined surface inclined backward. That is, the second wedge portion 539 is formed to have a thickness ( Fig.32 The top of the second wedge portion 539 is in the front-to-back direction ( Fig.32 In the left-right direction of B), it is located between the additional movable contact 9 and the second fixed terminal 2 (third fixed terminal 38).

[0335] The top end of the first fixed terminal 1, the second fixed terminal 2, the top end of the third fixed terminal 38, the movable contact 3, the additional movable contact 9, the first crimping spring 411, the second crimping spring 412, the housing 52, and the piston 53 are accommodated in the internal space of the housing 7. In addition, the igniter 51 and the housing 52 are arranged in the housing 7 in a manner facing the center of the upper surface of the piston 53. Fig.32 B and Fig.33 In FIG. 5 , the igniter 51 and the housing 52 are indicated by imaginary lines.

[0336] In this modified example, when the igniter 51 generates gas, the pressure in the pressurized chamber 520 increases, and the increased pressure is used to press the piston 53 downward. As the piston 53 moves downward, the first wedge portion 538 enters between the movable contact 3 and the first fixed terminal 1 (and between the movable contact 3 and the second fixed terminal 2), and moves backward ( Fig.32 As a result, the first movable contact 31 is pulled away from the first fixed contact 11, and the second movable contact 32 is pulled away from the second fixed contact 21. In addition, as the piston 53 moves downward, the second wedge portion 539 enters between the additional movable contact 9 and the second fixed terminal 2 (and between the additional movable contact 9 and the third fixed terminal 38), and moves forward ( Fig.32 B to the left) press the additional movable contact 902 (refer to Fig.33 ). As a result, the third movable contact 91 is pulled away from the third fixed contact 23 , and the fourth movable contact 92 is pulled away from the fourth fixed contact 381 .

[0337] In this modification, the direction in which the movable contact 3 moves (backward) is orthogonal to the direction in which the piston 53 moves (downward). In addition, in this modification, the directions in which the movable contact 3 and the additional movable contact 9 move are different from each other. In particular, in the modification, the movable contact 3 and the additional movable contact 9 are pressed by the piston 53 and move toward each other.

[0338] In the circuit disconnecting device 100 of the present modification as well, the movable contact 31 is quickly pulled away from the fixed contact 11 , so that the arc can be extinguished in a short time, and the current interruption performance can be improved.

[0339] In the circuit disconnecting device 100 of the present modification, the movable contact 3 and the additional movable contact 9 are arranged in parallel. The movable contact 3 is arranged in a direction in which the movable contact 31 and the fixed contact 11 are opposite ( Fig.30The additional movable contact 9 is located between the additional movable contact 9 and the fixed contact 1 in the left-right direction of A. In addition, the direction of the current flowing through the additional movable contact 9 is opposite to the direction of the current flowing through the movable contact 3. For example, when the first fixed terminal 1 is at a higher potential than the third fixed terminal 38, the current flowing from the first movable contact 31 to the second movable contact 32 flows through the movable contact 3, and the current flowing from the third movable contact 91 to the fourth movable contact 92 flows through the additional movable contact 9.

[0340] According to the above structure, the magnetic field generated by the current flowing through the additional movable contact 9 is used to apply a Lorentz force in a direction away from the additional movable contact 9 to the current flowing through the movable contact 3. Therefore, in this modification, the connection state between the first movable contact 31 and the first fixed contact 11 and the connection state between the second movable contact 32 and the second fixed contact 21 can be stabilized in response to the electromagnetic repulsive force.

[0341] In short, the additional movable contact 9 can be made to function as a circuit chip (fourth circuit chip 1404 , 2404 ) of the circuit disconnecting device 100 according to the tenth modification.

[0342] In addition, similarly to the movable contact 3, the magnetic field generated by the current flowing through the movable contact 3 applies a Lorentz force in a direction away from the movable contact 3 to the current flowing through the additional movable contact 9. Thus, it is possible to stabilize the connection state between the third movable contact 91 and the third fixed contact 23 and the connection state between the fourth movable contact 92 and the fourth fixed contact 381 in response to the electromagnetic repulsive force.

[0343] Furthermore, the two contacts (two contact groups of the movable contact and the fixed contact) between the movable contact 3 and the first fixed contact 11 and the second fixed contact 21, and the two contacts between the additional movable contact 9 and the third fixed contact 23 and the fourth fixed contact 381 are electrically connected in series. That is, arcs are generated between the four contacts (contact groups) electrically connected in series on the current path between the first fixed terminal 1 and the third fixed terminal 23. Thus, the cutting performance can be improved.

[0344] (2.6) Modification 22, Modification 23

[0345] The circuit disconnecting device 100 may include a magnetic flux generating unit 8. The magnetic flux generating unit 8 generates a magnetic flux in the storage chamber 70 for extending the arc generated between the first movable contact (movable contact) 31 and the first fixed contact (fixed contact) 11 (between the second movable contact 32 and the second fixed contact 21).

[0346] Fig.34 , Fig.35The circuit interruption device 100 of Modification 22 is shown, which includes two arc extinguishing magnets 81 and 82 as the magnetic flux generating portion 8. The circuit interruption device 100 of Modification 22 further includes two seal yokes 83 and 84 as the magnetic flux generating portion 8. Fig.34 is a perspective view of a circuit disconnecting device 100 according to Modification 22, Fig.35 This is a diagram for explaining how the arc is extended by the arc extinguishing magnets 81 and 82 .

[0347] The sealing yokes 83 and 84 are ferromagnetic bodies, for example, formed of a metal material such as iron. The sealing yokes 83 and 84 hold the arc extinguishing magnets 81 and 82. The sealing yokes 83 and 84 are arranged on both sides of the housing 7 in the left-right direction so as to surround the housing 7 from both sides in the left-right direction.

[0348] The arc extinguishing magnets 81 and 82 are arranged in a manner that opposite poles (S pole and N pole) face each other in the front-to-back direction. The arc extinguishing magnets 81 and 82 are arranged on both sides in the front-to-back direction relative to the housing 7. When the movable contact 3 leaves the first fixed terminal 1 and the second fixed terminal 2, the arc extinguishing magnets 81 and 82 extend the arc generated between the first movable contact 31 and the first fixed contact 11 and between the second movable contact 32 and the second fixed contact 21. The sealing yokes 83 and 84 surround the housing 7 together with the arc extinguishing magnets 81 and 82. In other words, the arc extinguishing magnets 81 and 82 are sandwiched between the side surfaces in the front-to-back direction of the housing 7 and the sealing yokes 83 and 84. One side (front end face) in the front-to-back direction of one (front) arc extinguishing magnet 81 is connected to one end of the sealing yoke 83 and 84, and the other side (rear end face) in the front-to-back direction is in contact with the housing 7. The other (rear) arc extinguishing magnet 82 has one front-to-rear surface (rear end surface) coupled to the other end of the seal yokes 83 , 84 , and the other front-to-rear surface (front end surface) contacts the housing 7 .

[0349] In the present embodiment, the arc extinguishing magnets 81 and 82 are arranged in a position overlapping with the first fixed contact 11 and the second fixed contact 21 in the vertical direction. That is, the contact point between the first fixed contact 11 and the first movable contact 31 and the contact point between the second fixed contact 21 and the second movable contact 32 are included in the magnetic field generated between the arc extinguishing magnets 81 and 82.

[0350] According to this structure, Fig.35 As shown, the sealed yoke 83 forms a part of the magnetic circuit through which the magnetic flux φ1 generated by the pair of arc extinguishing magnets 81 and 82 passes. Similarly, the sealed yoke 84 forms a part of the magnetic circuit through which the magnetic flux φ1 generated by the pair of arc extinguishing magnets 81 and 82 passes. These magnetic fluxes φ1 act on the contact point between the first fixed contact 11 and the first movable contact 31 and the contact point between the second fixed contact 21 and the second movable contact 32.

[0351] exist Fig.35 In the example of , it is assumed that a forward magnetic flux φ1 is generated in the internal space of the housing 7, and a current I1 flows from the first fixed terminal 1 to the second fixed terminal 2. In this state, if the movable contact 3 moves downward and is pulled away from the first fixed terminal 1 and the second fixed terminal 2, a downward discharge current (arc) is generated between the first fixed contact 11 and the first movable contact 31 from the first fixed contact 11 to the first movable contact 31. Therefore, the magnetic flux φ1 acts on the arc with a leftward Lorentz force F2 (see Fig.35 ). That is, the arc generated between the first fixed contact 11 and the first movable contact 31 is stretched to the left and extinguished. On the other hand, an upward discharge current (arc) is generated between the second fixed contact 21 and the second movable contact 32 from the second movable contact 32 toward the second fixed contact 21. Therefore, the magnetic flux φ1 exerts a rightward Lorentz force F3 on the arc (refer to Fig.35 ). That is, the arc generated between the second fixed contact 21 and the second movable contact 32 is elongated to the right and extinguished.

[0352] In this modification, the arc generated between the first movable contact 31 and the first fixed contact 11 (between the second movable contact 32 and the second fixed contact 21 ) can be further extended and extinguished by the arc extinguishing magnets 81 and 82 .

[0353] In order to form a magnetic circuit and enhance the magnetic flux generated between the contacts, the circuit disconnection device 100 of Modification 22 includes sealed yokes 83 and 84, but the sealed yokes 83 and 84 are not essential. In addition, the arc extinguishing magnets 81 and 82 may be arranged so that the same poles (S poles or N poles) face each other.

[0354] You can also Fig.36 As shown in the modified example 23, the magnetic flux generating portion 8 has a circuit sheet 85 through which the current I2 flows. The circuit sheet 85 includes a circuit sheet 851 that is arranged along the left side surface of the housing 7 and through which the current I2 flows downward, and a circuit sheet 852 that is arranged along the right side surface of the housing 7 and through which the current I2 flows upward. That is, the direction of the current I2 flowing in the circuit sheet 851 is the same as the direction of the current I1 flowing from the first fixed contact 11 toward the first movable contact 31. In addition, the direction of the current I2 flowing in the circuit sheet 852 is the same as the direction of the current I1 flowing from the second movable contact 32 toward the second fixed contact 21. As a result, in the internal space of the housing 7, Fig.35Similarly to the example, a forward magnetic flux φ1 is generated. In addition, the arc generated between the first fixed contact 11 and the first movable contact 31 is elongated to the left and extinguished. In addition, the arc generated between the second fixed contact 21 and the second movable contact 32 is elongated to the right and extinguished.

[0355] In this way, the arc generated between the first movable contact 31 and the first fixed contact 11 (between the second movable contact 32 and the second fixed contact 21 ) can be further extended and extinguished by the magnetic field generated by the current I2 flowing through the circuit sheet 85 .

[0356] In addition, the circuit chip 85 may be combined with the first electrode 12 or the second electrode 22. That is, the current I2 flowing in the circuit chip 85 may be the same as the current I1 flowing in the circuit disconnection device 100. For example, the upper end of the circuit chip 851 may be led around the outer shell 7 away from the outer shell 7 and combined with the second electrode 22. Alternatively, the upper end of the circuit chip 852 may be led around the outer shell 7 away from the outer shell 7 and combined with the first electrode 12.

[0357] (2.7) Modification 24

[0358] Reference Fig.37 The circuit disconnecting device 100 of the modification 24 is described. The circuit disconnecting device 100 of the modification 24 includes an arc extinguishing member 80. The arc extinguishing member 80 is arranged in the same space (storage chamber 70) as the first movable contact (movable contact) 31 and the first fixed contact (fixed contact) 11 (the second movable contact 32 and the second fixed contact 21). The arc extinguishing member 80 is used to promote the extinguishing of the arc generated between the first movable contact (movable contact) 31 and the first fixed contact (fixed contact) 11 (between the second movable contact 32 and the second fixed contact 21).

[0359] The arc extinguishing member 80 includes, for example, at least one of an arc extinguishing gas generating member 86, a gas 87, and an arc extinguishing body 88. The arc extinguishing gas generating member 86 releases arc extinguishing gas into the storage chamber 70 due to being heated. The gas 87 has an arc extinguishing property and is sealed in the storage chamber 70. The gas 87 may also be a liquid having an arc extinguishing property. The arc extinguishing body 88 extinguishes the arc by contacting the arc.

[0360] The arc extinguishing gas is released into the storage chamber 70, for example, to increase the electric field strength (voltage per unit length) of the arc (compared to vacuum / air). This shortens the length of the arc that may exist when a certain constant voltage is applied to both ends of the arc, and promotes arc extinguishing. The arc extinguishing gas is, for example, hydrogen.

[0361] The arc-extinguishing gas generating member 86 is composed of, for example, a hydrogen storage alloy (metal hydride) that absorbs hydrogen. The arc-extinguishing gas generating member 86 releases the stored hydrogen (arc-extinguishing gas) when, for example, it is heated. Fig.37 As shown, the arc-extinguishing gas generating member 86 made of a hydrogen storage alloy is provided on the inner surface of the left wall of the housing 7 in a manner located near the first movable contact 31 and the first fixed contact 11. In addition, the arc-extinguishing gas generating member 86 made of a hydrogen storage alloy is provided on the inner surface of the right wall of the housing 7 in a manner located near the second movable contact 32 and the second fixed contact 21.

[0362] For example, when the movable contact 3 is pressed by the piston 53 of the pyrotechnic actuator 5 and moves downward, if an arc is generated between the first fixed contact 11 and the first movable contact 31, the heat of the arc is transferred to the arc-extinguishing gas generating member 86 via the gas in the housing 7. As a result, the arc-extinguishing gas generating member 86 is heated, and arc-extinguishing gas (hydrogen) is released from the arc-extinguishing gas generating member 86. By using this arc-extinguishing gas, the electric field intensity of the arc can be increased, and the arc can be quickly cooled and extinguished. In addition, the arc-extinguishing gas generating member 86 is arranged near the first movable contact 31 and the first fixed contact 11, so the arc can be extinguished by blowing the arc-extinguishing gas strongly released from the arc-extinguishing gas generating member 86 toward the arc.

[0363] In addition, the component of the arc-extinguishing gas is not limited to hydrogen, and may also be composed of nitrogen, etc. The material constituting the arc-extinguishing gas generating member 86 is not limited to the hydrogen storage alloy, and any material that releases the arc-extinguishing gas when heated may be sufficient. The material constituting the arc-extinguishing gas generating member 86 may be, for example, a resin material such as phenolic resin, nylon resin mixed with magnesium hydroxide, a metal material such as hydrogen storage metal, titanium hydride, or an inorganic substance such as boric acid.

[0364] The inner wall of the housing 7 may also serve as the arc-extinguishing gas generating member 86. In other words, the inner cylinder 71 may be formed of a resin material that releases arc-extinguishing gas when heated.

[0365] The gas 87 as the arc extinguishing member 80 is an arc extinguishing gas. The gas 87 is sealed in the storage chamber 70. As the arc extinguishing gas, for example, the above-mentioned hydrogen, SF6 (sulfur hexafluoride), etc. Instead of the gas 87, a liquid with arc extinguishing properties can be sealed in the storage chamber 70. The liquid with arc extinguishing properties is, for example, oil such as silicone oil.

[0366] The arc extinguishing body 88 as the arc extinguishing member 80 is, for example, a solidified material formed by solidifying arc extinguishing sand having arc extinguishing properties such as silica sand using an adhesive or the like. The arc extinguishing body 88 composed of a solidified material is provided on the inner surface of the left wall of the housing 7 in a manner such that it is located near the first movable contact 31 and the first fixed contact 11. In addition, the arc extinguishing body 88 composed of a solidified material is provided on the inner surface of the right wall of the housing 7 in a manner such that it is located near the second movable contact 32 and the second fixed contact 21. For example, if an arc is generated between the first movable contact 31 and the first fixed contact 11, the arc is elongated toward the arc extinguishing body 88 under the action of the magnetic flux generated by the arc. The arc extinguishing body 88 extinguishes the arc by contacting the elongated arc.

[0367] More preferably, the arc extinguishing body 88 is used together with at least one of the arc extinguishing magnets 81 and 82 of Modification 22 and the circuit sheet 85 of Modification 23. The arc elongated laterally by the arc extinguishing magnets 81 and 82 and the circuit sheet 85 contacts the arc extinguishing body 88, thereby further accelerating the arc extinguishing.

[0368] In addition, the arc extinguishing body 88 may be an arc extinguishing device including a plurality of arc extinguishing grids formed of metal plates. As the arc extinguishing device, for example, an arc extinguishing device similar to a known circuit breaker may be used.

[0369] (2.8) Modification 25

[0370] Reference Fig.38 A. Fig.38 B will describe a circuit disconnecting device 100 according to Modification 25. The circuit disconnecting device 100 according to Modification 25 includes a plurality of sets of movable contacts and fixed terminals in a circuit connecting the first electrode 12 and the second electrode 22 .

[0371] Specifically, the circuit disconnection device 100 of the modification 25 includes a plurality of movable contacts 3 (a first movable contact 301 and a second movable contact 302), and further includes a third fixed terminal 38 in addition to the first fixed terminal 1 and the second fixed terminal 2. In addition, the structure of the second fixed terminal 2 of the circuit disconnection device 100 of the modification 25 is different from that of the embodiment. In the modification 25, the same structure as that of the circuit disconnection device 100 of the embodiment is omitted from illustration and detailed description.

[0372] like Fig.38 A. Fig.38 As shown in B, the circuit disconnecting device 100 of the modification 25 includes a first fixed terminal 1 , a second fixed terminal 2 , a first movable contact 301 , a second movable contact 302 , an electrically insulating holding body 36 , and a third fixed terminal 38 .

[0373] like Fig.38As shown in A, the shape of the first fixed terminal 1 of this modification is the same as the first fixed terminal 1 of the embodiment. That is, the first fixed terminal 1 of this modification includes a connecting piece 110, an electrode piece 120, a connecting piece 130, and a circuit piece 140, and the electrode piece 120 functions as a first electrode 12. The first fixed terminal 1 is fixed to the left wall of the housing 7 in a state where the electrode piece 120 is exposed to the outside from the left wall of the housing 7, and the lower end of the connecting piece 130 and the connecting piece 110 are stored in the internal space (storage chamber 70) of the housing 7.

[0374] The second fixed terminal 2 of this modification is different from the embodiment and does not include the electrode sheet 220 and the circuit sheet 240. The dimension of the connection sheet 210 of the second fixed terminal 2 in the front-to-back direction is longer than the total length of the dimension of the first movable contact 301 in the front-to-back direction and the dimension of the second movable contact 302 in the front-to-back direction. The second fixed terminal 2 is fixed to the right wall of the housing 7 in a state where the lower end of the connection sheet 230 and the connection sheet 210 are accommodated in the internal space (accommodation chamber 70) of the housing 7.

[0375] The third fixed terminal 38 is made of a conductive metal material. The third fixed terminal 38 has the same shape as the first fixed terminal 1. The third fixed terminal 38 integrally includes a connection piece 3810, an electrode piece 3820, a connecting piece 3830, and a circuit piece 3840. The third fixed terminal 38 is arranged on the left wall of the housing 7 in a manner aligned with the first fixed terminal 1. The third fixed terminal 38 is fixed to the left wall of the housing 7 in a state where the electrode piece 3820 is exposed to the outside from the left wall of the housing 7 and the lower end of the connecting piece 3830 and the connecting piece 3810 are stored in the internal space (storage chamber 70) of the housing 7. The electrode piece 3820 functions as the second electrode 22 connected to the second end of the external electrical circuit.

[0376] The first movable contact 301 and the second movable contact 302 are plate-shaped members made of a conductive metal material and are formed long in the left-right direction. The first movable contact 301 and the second movable contact 302 are arranged parallel to each other.

[0377] The first movable contact 301 has a first movable contact 31 at the first end (left end) in the length direction thereof, and has a second movable contact 32 at the second end (right end). The first movable contact 301 is arranged below the first fixed terminal 1 and the second fixed terminal 2 in such a manner that both ends in the length direction (left-right direction) of the first movable contact 301 are opposite to the connecting piece 110 and the connecting piece 210. The portion of the lower surface of the first fixed terminal 1 (connecting piece 110) that contacts the first movable contact 31 is the first fixed contact 11. The portion of the lower surface of the second fixed terminal 2 (connecting piece 210) that contacts the second movable contact 32 is the second fixed contact 21.

[0378] The second movable contact 302 has a third movable contact 33 at the first end (right end) in the length direction thereof and a fourth movable contact 34 at the second end (left end). The second movable contact 302 is arranged below the second fixed terminal 2 and the third fixed terminal 38 in such a manner that both ends in the length direction (left-right direction) thereof are opposite to the connecting piece 210 and the connecting piece 3810. The portion of the lower surface of the second fixed terminal 2 (connecting piece 210) that contacts the third movable contact 33 is the third fixed contact 23. The portion of the lower surface of the third fixed terminal 38 (connecting piece 3810) that contacts the fourth movable contact 34 is the fourth fixed contact 381.

[0379] The holding body 36 is formed of an insulating material such as resin into a rectangular parallelepiped shape extending in the front-rear direction. The holding body 36 holds the first movable contact 301 and the second movable contact 302. The first movable contact 301 penetrates the rear end portion ( Fig.38 The second movable contact 302 penetrates the front end portion ( Fig.38 The upper surface of the retaining body 36 faces the second end 532 of the piston 53 of the pyrotechnic actuator 5. The lower surface of the retaining body 36 is formed with a fitting recess 360 for receiving the second end 412 of the pressure contact spring 41.

[0380] In the circuit disconnection device 100 of the modification 25, when the retaining body 36 is pressed by the piston 53, the plurality of movable contacts (the first movable contact 31 to the fourth movable contact 34) are (approximately) simultaneously pulled apart from the plurality of fixed contacts (the first fixed contact to the fourth fixed contact). Specifically, in the circuit disconnection device 100 of the modification 25, the first movable contact 301 and the second movable contact 302 move relative to the first fixed terminal 1, the second fixed terminal 2, and the third fixed terminal 38 in the storage chamber 70 in conjunction with the pressure of the gas generated by the igniter 51. As a result, the first movable contact 31 is pulled apart from the first fixed contact 11, the second movable contact 32 is pulled apart from the second fixed contact 21, the third movable contact 33 is pulled apart from the third fixed contact 23, and the fourth movable contact 34 is pulled apart from the fourth fixed contact 381.

[0381] As described above, the circuit disconnecting device 100 of this modification includes a plurality of (4) contact groups (a combination of movable contacts and fixed contacts) connected in series, and the plurality of contact groups are disconnected (substantially) at the same time. In this case, arcs are generated between the movable contacts and the fixed contacts constituting each contact group, so the arc voltage of each arc becomes smaller (in this modification, it is about half of that in the above embodiment in which there are two contact groups). Thus, arc extinguishing is promoted.

[0382] (2.9) Modification 26 to Modification 29

[0383] Reference Figure 39 to Figure 42 The circuit disconnection device 100 of Modification 26 to Modification 29 is described. The circuit disconnection device 100 of Modification 26 to Modification 29 is respectively provided with a locking mechanism 19 provided in the storage chamber 70. The locking mechanism 19 holds the movable contact 3 at the isolated position where the movable contact (first movable contact) 31 is pulled away from the fixed contact (first fixed contact) 11. The circuit disconnection device 100 of Modification 26 to Modification 29 can prevent the movable contact 3 from returning (rebounding) to the first fixed terminal 1 and the second fixed terminal 2 by using the locking mechanism 9. The other structures in the circuit disconnection device 100 of Modification 26 to Modification 29 are the same as those in the embodiment, so the illustration and detailed description are omitted.

[0384] like Fig.39 As shown, the circuit disconnection device 100 of the modification 26 is provided with a permanent magnet 191 as the locking mechanism 19. Specifically, in the circuit disconnection device 100 of the modification 26, a pair of permanent magnets 191 are fixed to the bottom surface (inner surface) of the inner cylinder 71 at positions respectively opposite to the two ends of the movable contact 3 in the left-right direction in the up-down direction. In addition, a pair of plate-shaped magnetic members made of magnetic material, specifically iron sheets 192, are fixed to the lower surface of the movable contact 3 (the surface opposite to the bottom surface of the inner cylinder 71) at positions respectively opposite to the pair of permanent magnets 191 in the up-down direction.

[0385] like Fig.39 As shown by the dotted line, after the movable contact 3 is pressed downward by the pyrotechnic actuator 5, the iron piece 192 is combined with the permanent magnet 191 under the action of magnetic force and the position is fixed. Thus, the movable contact 3 is prevented from rebounding.

[0386] In the circuit interrupting device 100 according to the modification 26, the number of the permanent magnets 191 may be one or three or more.

[0387] like Fig.40 As shown, the circuit disconnecting device 100 of the modification 27 includes a restricting portion 193 as the locking mechanism 19 that is mechanically coupled to the movable contact 3 and restricts the movable contact 3 from moving in the direction toward the fixed terminal (first fixed terminal) 1 .

[0388] The restricting portion 193 is formed of, for example, a resin material, and includes a housing 1931 and a pair of claws 1932. The housing 1931 is formed in the left-right direction (the length direction of the movable contact 3); Fig.40 The first yoke 61 is a rectangular parallelepiped that is longer in the direction of the normal to the paper surface of the magnetic yoke 61 and has a groove extending in the left-right direction on its upper surface. The width of the groove is equal to the width of the first yoke 61 in the front-to-back direction ( Fig.40The size of the pair of claws 1932 is approximately equal in the left and right directions. Fig.40 protrudes on the inner side in the left and right directions.

[0389] like Fig.40 As shown by the double-dashed line, after the movable contact 3 and the first yoke 61 are pressed downward by the pyrotechnic actuator 5, a pair of claws 1932 are hooked on the upper surface of the first yoke 61, and the movable contact 3 and the first yoke 61 are held in this position by the restricting portion 193. Thus, the movable contact 3 is prevented from rebounding.

[0390] In the circuit disconnection device 100 of the modification 27, the pair of claws 1932 may be hooked on the movable contact 3 instead of the first yoke 61. For example, the pair of claws 1932 may be provided at both ends of the storage body 1931 in the left-right direction in a manner that hooks on both ends in the length direction (left-right direction) of the movable contact 3. Alternatively, the pair of claws 1932 may be provided on the inner side surface of the inner cylinder 71. For example, a pair of claws may be provided on the inner cylinder 71, which protrude inward from the left and right sides of the inner cylinder 71 and are spaced apart from each other by a smaller distance than the length of the movable contact 3 in the left-right direction.

[0391] like Fig.41 As shown, the circuit disconnecting device 100 of the modification 28 includes a resin member 194 deformed by the collision of the movable contact 3 as the lock mechanism 19. The resin member 194 of the modification 9 is a deformed portion 1941 that is plastically deformed by the collision of the movable contact 3 and integrated with the first yoke 61.

[0392] The deformation portion 1941 is in the left-right direction (the length direction of the movable contact 3; Fig.41 The shape of the rectangular parallelepiped is longer in the normal direction of the paper surface) and has a groove extending in the left-right direction on its upper surface. The groove is in the front-back direction ( Fig.41 The tapered shape becomes narrower towards the bottom in the left-right direction. Fig.41 In the left-right direction), the width of the upper end of the groove is larger than the width of the first yoke 61, and the width of the lower end of the groove is smaller than the width of the first yoke 61.

[0393] like Fig.41 As shown by the double-dashed line, when the movable contact 3 and the first yoke 61 are pressed downward by the pyrotechnic actuator 5, they move downward while deforming the inner side surface of the groove of the deformable portion 1941. As a result, the deformable portion 1941 is integrated with the first yoke 61, preventing the first yoke 61 and the movable contact 3 from returning upward.

[0394] like Fig.42As shown, the circuit disconnecting device 100 of Modification 29 includes a resin member 194 that is deformed by the collision of the movable contact 3 as the locking mechanism 19. In addition, in the circuit disconnecting device 100 of Modification 29, the movable contact 3 includes a protrusion 195 that protrudes in the direction toward the resin member 94. In addition, in the circuit disconnecting device 100 of Modification 29, a pair of claws 196 are provided on the left and right sides of the inner cylinder 71 and contact the upper surface of the movable contact 3 after the movement.

[0395] The resin member 194 is fixed to the bottom surface (inner surface) of the inner cylinder 71 at positions that are opposite to both ends of the movable contact 3 in the left-right direction in the vertical direction (at the bottom surface). Fig.42 In addition, on the lower surface of the movable contact 3 (the surface opposite to the bottom surface of the inner cylinder 71), a pair of protrusions 195 made of resin material are provided at positions opposite to the pair of resin members 194 in the up-down direction (at the left side). Fig.42 , only the left side is shown).

[0396] If the movable contact 3 and the first yoke 61 are pressed downward by the pyrotechnic actuator 5, the two ends of the movable contact 3 in the left-right direction collide with a pair of resin components 194 respectively, causing the resin components 194 to deform. As a result, the kinetic energy of the movable contact 3 and the first yoke 61 is absorbed by the resin component 194, and the speed of the movable contact 3 and the first yoke 61 is reduced. For example, when the movable contact 3 and the first yoke 61 reach the bottom surface of the inner cylinder 71 at a high speed, there is a possibility that they will rebound on the bottom surface of the inner cylinder 71. In contrast, in this modified example, the resin component 194 is used to absorb the kinetic energy of the movable contact 3 and the first yoke 61, thereby preventing the movable contact 3 and the first yoke 61 from rebounding. In addition, Fig.42 The two-dot chain line indicates the movable contactor 3 and the first yoke 61 at the position where the resin member 194 returns to the original shape after deformation.

[0397] That is, the resin member 194 of Modification 29 is a shock absorbing member (cushion) 1942 for absorbing the energy (kinetic energy) of the collision of the movable contact 3 .

[0398] In addition, the locking mechanism 19 may include other locking structures in addition to the permanent magnet 191, the restricting portion 193, and the resin member 194. In addition, the locking mechanism 19 may also include two or more of the permanent magnet 191, the restricting portion 193, the resin member 194, and other locking structures (for example, the permanent magnet 191 and the restricting portion 193 are included at the same time). In addition, if the circuit disconnection device 100 can prevent the movable contact 3 from rebounding by utilizing the non-return mechanism of the pyrotechnic actuator 5 and the pressure of the gas filled in the housing 52, it is not necessary to include the locking mechanism 19.

[0399] (2.10) Other variations

[0400] The application of the circuit disconnecting device 100 is not limited to the fuse for the vehicle 300. The circuit disconnecting device 100 can be used to disconnect any electrical circuit in which a large current such as a short-circuit current may flow.

[0401] The pyrotechnic actuator 5 is not limited to a structure in which the movable contact 3 is moved by means of the piston 53. For example, the circuit disconnecting device 100 may be a structure in which the movable contact 3 directly receives the pressure of the gas generated by the igniter 51 (the movable contact 3 constitutes a part of the outer wall of the pressurized chamber 520), or a structure in which the movable contact 3 directly moves under the action of the gas pressure.

[0402] Before the piston 53 moves, the pressurizing chamber 520 may be connected to the storage chamber 70 , but is preferably separated from the storage chamber 70 .

[0403] The piston 53 may also contact the movable contactor 3. For example, the pin 535 of the piston 53 may protrude downward from the second yoke 62 and directly contact the upper surface of the movable contactor 3, or may indirectly contact the upper surface of the movable contactor 3 via a spacer.

[0404] A guide for guiding the moving direction of the movable contact 3 may be formed in the storage chamber 70 of the housing 7. The guide is formed long in the upper and lower directions on the inner wall of the storage chamber 70 in a manner that contacts the side surface of the movable contact 3 along the moving direction of the movable contact 3. Thus, when the movable contact 3 is moved by the pyrotechnic actuator 5, the movable contact 3 is not easily tilted. The guide may also be a rod extending upward from the bottom surface of the storage chamber 70 and penetrating the movable contact 3.

[0405] The circuit disconnecting device 100 may also include a stopper between the piston 53 and the movable contact 3 for hindering the movement of the piston 53. When the piston 53 moves under the pressure of the gas generated by the igniter 51, the stopper will break due to the force applied by the self-moving piston 53, and until it breaks, the stopper hinders the piston 53 from applying force to the movable contact 3 (hinders the pressing of the movable contact 3). In this case, compared with the case without the stopper, the piston 53 presses the movable contact 3 after the pressure in the pressurized chamber 520 becomes greater. Therefore, the movable contact 3 is pressed by the piston 53 with a greater force and moves more rapidly, and the arc generated between the movable contact 31 and the fixed contact 11 is quickly elongated. As a result, the arc extinguishing performance of the circuit disconnecting device 100 is improved.

[0406] (3) Technical solution

[0407] According to the embodiments and variations described above, the circuit disconnecting device (100) of the first technical solution includes a fixed terminal (1), a movable contact (3), a holding portion (4), and an igniter (51). The fixed terminal (1) has a fixed contact (11). The movable contact (3) has a movable contact (31). The movable contact (3) is formed independently of the fixed terminal (1). The holding portion (4) holds the movable contact (3) in a manner that connects the movable contact (31) to the fixed contact (11). The igniter (51) generates gas by combustion. In the circuit disconnecting device (100), the movable contact (3) moves in a direction away from the fixed terminal (1) in conjunction with the pressure of the gas generated by the igniter (51), thereby pulling the movable contact (31) away from the fixed contact (11).

[0408] According to the first technical solution, the energy of the gas generated by the igniter (51) is used to move (pull apart) the movable contact (3) at a high speed relative to the fixed terminal (1), thereby cutting off the circuit. As a result, the arc generated between the movable contact (31) and the fixed contact (11) is quickly stretched to a distance as long as the amount of movement of the movable contact (3) and extinguished. As a result, the arc can be extinguished in a short time, and the current cutting performance can be improved.

[0409] The circuit disconnection device (100) of the second technical solution is based on the first technical solution, wherein the holding portion (4) has an elastic portion (a pressure contact spring 41) that applies force to the movable contact (31) in a direction to connect the movable contact (31) to the fixed contact (11).

[0410] According to the second technical solution, the holding portion (4) can hold the movable contact (3) in such a manner that the movable contact (31) is connected to the fixed contact (11).

[0411] A circuit disconnection device (100) according to a third technical solution is based on the first or second technical solution, wherein the holding portion (4) includes a permanent magnet (421; 422).

[0412] According to the third technical solution, the holding portion (4) can hold the movable contact (3) in such a manner that the movable contact (31) is connected to the fixed contact (11).

[0413] A circuit disconnecting device (100) according to a fourth technical solution is based on any one of the first to third technical solutions, wherein the holding portion (4) includes a latch mechanism (43) for mechanically holding the movable contact (3).

[0414] According to the fourth technical solution, the holding portion (4) can hold the movable contact (3) in such a manner that the movable contact (31) is connected to the fixed contact (11).

[0415] A circuit disconnecting device (100) according to a fifth technical solution is based on any one of the first to fourth technical solutions, wherein the movable contact (31) is in contact with the fixed contact (11).

[0416] According to the fifth technical solution, the force required to pull the movable contact (31) away from the fixed contact (11) becomes smaller.

[0417] A circuit disconnecting device (100) according to a sixth technical solution is based on any one of the first to fourth technical solutions, wherein the movable contact (31) and the fixed contact (11) are welded.

[0418] According to the sixth technical solution, the contact surface between the movable contact (31) and the fixed contact (11) becomes larger, and the contact pressure between the movable contact (31) and the fixed contact (11) increases.

[0419] The circuit disconnection device (100) of the seventh technical solution is based on any one of the first to sixth technical solutions, and includes a pressurized chamber (520) and a piston (53). The pressurized chamber (520) receives the pressure of the gas generated by the igniter (51). The piston (53) moves by receiving the pressure in the pressurized chamber (520) at the first end (531), and applies a force in a direction away from the fixed terminal (1) to the movable contact (3) at the second end (532), thereby moving the movable contact (3).

[0420] According to the seventh technical solution, the movable contact (3) is moved by the piston (53), so that the pressure of the gas can be efficiently transmitted to the movable contact (3) compared to the case where the movable contact (3) directly bears the pressure of the gas.

[0421] The circuit disconnecting device (100) of the eighth technical solution is based on the seventh technical solution, wherein the piston (53) presses the movable contact (3) using the second end (532).

[0422] According to the eighth technical solution, the piston (53) can be used to efficiently transmit the pressure of the gas to the movable contact (3).

[0423] The circuit disconnecting device (100) of the ninth technical solution is based on the seventh or eighth technical solution, wherein the direction in which the movable contact (3) moves is a direction that intersects with the direction in which the piston (53) moves.

[0424] According to the ninth aspect, the degree of freedom in designing the circuit disconnecting device (100) is increased.

[0425] The circuit disconnecting device (100) of the tenth technical solution is based on the seventh technical solution, wherein the second end (532) of the piston (53) is connected to the movable contact (3). The piston (53) pulls the movable contact (3) with the second end (532).

[0426] According to the tenth technical solution, the pressure of the gas can be efficiently transmitted to the movable contact (3) by using the piston (53).

[0427] The circuit disconnecting device (100) of the eleventh technical solution is provided with a non-return mechanism (third cylinder) based on any one of the seventh to tenth technical solutions. The non-return mechanism mechanically holds the piston (53) after the movable contact (3) moves, preventing the piston (53) from returning to its original position.

[0428] According to the eleventh technical solution, the piston (53) is prevented from returning to its original position, and the movable contact (3) moved by the piston (53) is also prevented from returning to its original position.

[0429] The circuit disconnection device (100) of the twelfth technical solution is based on any one of the first to eleventh technical solutions, and comprises a first electrode (12) and a second electrode (22) respectively connected to a first end and a second end of an external electrical circuit. The circuit disconnection device (100) comprises only one set of a movable contact (31) and a fixed contact (11) in a circuit connecting the first electrode (12) and the second electrode (22).

[0430] According to the twelfth technical solution, there is only one location where the connection may become unstable due to the electromagnetic repulsion force, and it is possible to stabilize the connection state between the movable contact (31) and the fixed contact (11), that is, to stabilize the conduction state between the first electrode (12) and the second electrode (22).

[0431] The circuit disconnection device (100) of the 13th technical solution is based on any one of the 1st to 12th technical solutions, wherein the movable contact (3) is plate-shaped. The circuit disconnection device (100) includes a yoke (first yoke 61) fixed to the surface of the movable contact (3) opposite to the surface where the movable contact point (31) is located.

[0432] According to the thirteenth technical solution, when current flows through the movable contact (3), the magnetic field generated by the current acts on the magnetic field in a manner that the magnetic field passes through the first magnetic yoke (61). The center of the magnetic field acting on the current flowing through the movable contact (3) is guided toward the surface side where the movable contact (31) of the movable contact (3) is located, and as a result, a force is generated in a direction that maintains the connection between the movable contact (31) and the fixed contact (11). As a result, the connection state between the movable contact (31) and the fixed contact (11) can be stabilized.

[0433] The circuit disconnecting device (100) of the fourteenth technical solution is based on the thirteenth technical solution and further includes a second yoke (62). The second yoke (62) is fixed to be separated from the movable contact (3) at a position opposite to the first yoke (61) across the movable contact (3).

[0434] According to the 14th technical solution, when current flows through the movable contact (3), an attractive force is generated between the first yoke (61) and the second yoke (62), and a force is generated in the movable contact (3) to maintain the connection between the movable contact (31) and the fixed contact (11). Thus, the connection state between the movable contact (31) and the fixed contact (11) can be stabilized.

[0435] The circuit disconnection device (100) of the fifteenth technical solution is based on any one of the first to fourteenth technical solutions, and comprises a circuit sheet (fourth circuit sheet 1404, 2404) electrically connected to the fixed contact (11) and extending in the direction of the current flowing in the movable contact (3). The movable contact (3) is located between the circuit sheet (fourth circuit sheet 1404, 2404) and the fixed contact (11) in the direction in which the movable contact (31) and the fixed contact (11) are opposite. The direction of the current flowing in the circuit sheet is opposite to the direction of the current flowing in the movable contact (3).

[0436] According to the fifteenth technical solution, a repulsive force is generated between the movable contact (3) and the circuit sheet (the fourth circuit sheet 1404, 2404). Therefore, a force in the direction of moving away from the circuit sheet (the fourth circuit sheet 1404, 2404) is applied to the movable contact (3). Thus, the connection state between the movable contact (31) and the fixed contact (11) can be stabilized.

[0437] The circuit disconnecting device (100) of the 16th technical solution is based on any one of the 1st to 15th technical solutions and has a bimetallic member (65) that bends due to temperature rise and presses the movable contact (3) in the direction from the movable contact (31) toward the fixed contact (11).

[0438] According to the sixteenth technical solution, it is possible to stabilize the connection state between the movable contact (31) and the fixed contact (11).

[0439] A circuit disconnecting device (100) according to a seventeenth technical solution is provided according to any one of the first to sixteenth technical solutions, and comprises a plurality of movable contacts (3) each having a movable contact point (31).

[0440] According to the seventeenth technical solution, the current flowing through each movable contact (3) is reduced, so the electromagnetic repulsive force is reduced. As a result, the connection state between the movable contact (31) and the fixed contact (11) can be stabilized.

[0441] The circuit disconnection device (100) of the eighteenth technical solution is based on the seventeenth technical solution, and in conjunction with the pressure of the gas generated by the igniter (51), a plurality of movable contacts (31) are pulled apart from a plurality of fixed contacts (11) at different timings.

[0442] According to the 18th technical solution, a plurality of movable contacts (3) can be pulled away from the fixed terminal (1) at different times. Thus, the arc can be generated only between the movable contact (3) whose last movable contact (31) is pulled away from the fixed contact (11) and the fixed terminal (1).

[0443] According to a nineteenth technical solution, in the circuit disconnecting device (100) of the seventeenth or eighteenth technical solution, the plurality of movable contacts (31) are formed of different materials.

[0444] According to the 19th technical solution, the movable contact point (31) of the movable contact (3) can be made of a material with higher arc resistance, a material with higher current carrying performance, etc. according to the application.

[0445] According to a 20th technical solution, in the circuit disconnecting device (100) according to the 17th or 18th technical solution, the plurality of movable contacts (31) are formed of the same material.

[0446] According to the 20th technical solution, by making the movable contacts (31) of the plurality of movable contacts (3) of the same material, the cost can be suppressed. In addition, by simultaneously pulling the movable contacts (31) of the plurality of movable contacts (3) away from the plurality of fixed contacts (11), the current flowing through each movable contact (3) is distributed and reduced, thereby reducing the electromagnetic repulsive force. Thus, the connection state between the movable contact (31) and the fixed contact (11) can be stabilized.

[0447] The circuit disconnecting device (100) of the 21st technical solution is any one of the technical solutions of the 17th to 20th technical solutions, wherein the plurality of movable contacts (3) include two movable contacts 3 (a first movable contact 301 and a second movable contact 302) arranged in parallel. The two movable contacts 3 (the first movable contact 301 and the second movable contact 302) move in different directions.

[0448] According to the twenty-first technical solution, a magnetic field generated by a current flowing through one movable contact (3) is used to exert a Lorentz force on a current flowing through another movable contact (3). The Lorentz force can be used to reduce the electromagnetic repulsive force, and the connection state between the movable contact (31) and the fixed contact (11) can be stabilized.

[0449] The circuit disconnection device (100) of the 22nd technical solution is based on any one of the technical solutions of the 1st to 21st technical solutions, wherein the movable contact (3) has a second movable contact (32) in addition to the first movable contact (31) as the movable contact (31). The circuit disconnection device (100) has a second fixed terminal (2) having a second fixed contact (21) in addition to the first fixed terminal (1) as the fixed terminal (1) of the first fixed contact (11) as the fixed contact (11). The movable contact (3) is clamped between the first fixed terminal (1) and the second fixed terminal (2) in such a manner that the first movable contact (31) contacts the first fixed contact (11) and the second movable contact (32) contacts the second fixed contact (21).

[0450] According to the twenty-second technical solution, it is possible to stabilize the connection state between the movable contact (31) and the fixed contact (11).

[0451] The circuit disconnection device (100) of the 23rd technical solution is based on the 22nd technical solution, wherein the relative orientation of the first fixed contact (11) and the first movable contact (31) is opposite to the relative orientation of the second fixed contact (21) and the second movable contact (32).

[0452] According to the twenty-third technical solution, it is possible to stabilize the connection state between the movable contact (31) and the fixed contact (11).

[0453] The circuit disconnection device (100) of the 24th technical solution is based on any one of the 1st to 23rd technical solutions, wherein one of the fixed contact (11) and the movable contact (31) is used as the first contact, the other is used as the second contact, and a plurality of second contacts are provided. The plurality of second contacts are connected to one first contact.

[0454] According to the 24th technical solution, by providing a plurality of connection locations between the fixed terminal (1) and the movable contact (3), the electromagnetic repulsive force at each connection location can be reduced.

[0455] The circuit disconnecting device (100) of the twenty-fifth technical solution is based on any one of the first to twenty-fourth technical solutions, and includes an additional movable contact (9) which is independent of the movable contact (3) and connected in series with the movable contact (3). The movable contact (3) and the additional movable contact (9) are arranged in parallel. The direction in which the movable contact (3) moves is different from the direction in which the additional movable contact (9) moves.

[0456] According to the twenty-fifth technical solution, the magnetic field generated by the current flowing through the additional movable contact (9) is used to apply a Lorentz force to the current flowing through the movable contact (3). The Lorentz force can be used to reduce the electromagnetic repulsive force, and the connection state between the movable contact (31) and the fixed contact (11) can be stabilized.

[0457] The structures of the second to twenty-fifth technical solutions are not essential structures of the circuit disconnecting device (100) and can be appropriately omitted.

[0458] The circuit disconnection device (100) of the 26th technical solution includes a fixed terminal (1), a movable contact (3), an igniter (51) and a storage chamber (70). The fixed terminal (1) has a fixed contact (11). The movable contact (3) is formed independently of the fixed terminal (1). The movable contact (3) has a movable contact (31) connected to the fixed contact (11). The igniter (51) generates gas by combustion. The storage chamber (70) is used to store the fixed contact (11) and the movable contact (3). In the circuit disconnection device (100), the movable contact (3) moves in the storage chamber (70) in a direction away from the fixed terminal (1) in conjunction with the pressure of the gas generated by the igniter (51), thereby pulling the movable contact (31) away from the fixed contact (11).

[0459] According to the twenty-sixth technical solution, the energy of the gas generated by the igniter (51) is used to cause the movable contact (3) to move (pull apart) at a high speed relative to the fixed terminal (1) in the storage chamber (70), thereby disconnecting the circuit. As a result, the arc generated between the contacts is elongated by an amount corresponding to the moving distance of the movable contact (3) in the storage chamber (70) and extinguished. Thus, the circuit disconnection device (100) can elongate the arc and extinguish it, thereby improving the current disconnection performance.

[0460] The circuit disconnection device (100) of the twenty-seventh technical solution is based on the twenty-sixth technical solution, and includes a pressurized chamber (520) and a piston (53). The pressurized chamber (520) is subjected to the pressure of the gas generated by the igniter (51). The piston (53) moves by using the first end (531) to receive the pressure in the pressurized chamber (520), and applies a force in a direction away from the fixed terminal (1) to the movable contact (3) by using the second end (532), thereby moving the movable contact (3).

[0461] According to the twenty-seventh technical solution, the movable contact (3) is moved by using the piston (53), so that the pressure of the gas can be efficiently transmitted to the movable contact (3) compared to the case where the movable contact (3) is directly subjected to the pressure of the gas.

[0462] The circuit disconnecting device (100) of the 28th technical solution is based on the 27th technical solution, and the piston (53) uses the second end (532) to press the movable contact (3).

[0463] According to the twenty-eighth technical solution, the piston (53) can be used to efficiently transmit the pressure of the gas to the movable contact (3).

[0464] The circuit disconnecting device (100) of the 29th technical solution is based on the 27th technical solution, wherein the second end (532) of the piston (53) is connected to the movable contact (3). The piston (53) pulls the movable contact (3) using the second end (532).

[0465] According to the twenty-ninth technical solution, the piston (53) can be used to efficiently transmit the pressure of the gas to the movable contact (3).

[0466] The circuit disconnecting device (100) of the 30th technical solution is provided with a non-return mechanism (third cylinder) based on any one of the technical solutions of the 27th to 29th technical solutions. The non-return mechanism mechanically holds the piston (53) after the movable contact (3) moves, preventing the piston (53) from returning to its original position.

[0467] According to the 30th technical solution, the piston (53) is prevented from returning to its original position, and the movable contact (3) moved by the piston (53) is also prevented from returning to its original position.

[0468] The circuit disconnecting device (100) of the 31st technical solution is provided with a magnetic flux generating unit (8) in addition to any one of the technical solutions of the 26th to 30th technical solutions. The magnetic flux generating unit (8) generates magnetic flux in the storage chamber (70) to extend the arc generated between the movable contact (31) and the fixed contact (11).

[0469] According to the thirty-first technical solution, the arc extinguishing generated between the movable contact (31) and the fixed contact (11) is promoted.

[0470] The circuit disconnecting device (100) of the 32nd technical solution is provided with an arc extinguishing member (80) based on any one of the 26th to 31st technical solutions. The arc extinguishing member (80) is arranged in the storage chamber (70). The arc extinguishing member (80) promotes the extinguishing of the arc generated between the movable contact (31) and the fixed contact (11).

[0471] According to the thirty-second technical solution, the arc extinguishing generated between the movable contact (31) and the fixed contact (11) is promoted.

[0472] The circuit disconnecting device (100) of the 33rd technical solution is based on the 32nd technical solution, wherein the arc extinguishing member (80) has an arc extinguishing gas generating component (86). The arc extinguishing gas generating component (86) releases arc extinguishing gas into the storage chamber (70) when heated.

[0473] According to the thirty-third technical solution, the arc extinguishing generated between the movable contact (31) and the fixed contact (11) is promoted.

[0474] The circuit disconnecting device (100) of the 34th technical solution is based on the 32nd or 33rd technical solution, wherein the arc extinguishing member (80) has a gas (87) or a liquid. The gas (87) or the liquid is sealed in the storage chamber (70) and has an arc extinguishing property.

[0475] According to the 34th technical solution, the arc extinguishing generated between the movable contact (31) and the fixed contact (11) is promoted.

[0476] The circuit disconnecting device (100) of the 35th technical solution is based on any one of the 32nd to 34th technical solutions, wherein the arc extinguishing member (80) includes an arc extinguishing body (88). The arc extinguishing body (88) is arranged in the storage chamber (70) and extinguishes the arc by contacting the arc.

[0477] According to the thirty-fifth technical solution, the arc extinguishing generated between the movable contact (31) and the fixed contact (11) is promoted.

[0478] The circuit disconnection device (100) of the 36th technical solution is based on any one of the 26th to 35th technical solutions, and includes a first electrode (12) and a second electrode (22) respectively connected to the first end and the second end of the external electrical circuit. The circuit disconnection device (100) includes a plurality of sets of movable contacts and fixed terminals (a first movable contact 301 and a first fixed terminal 1, a second movable contact 302 and a second fixed terminal 2) in the circuit connecting the first electrode (12) and the second electrode (22).

[0479] According to the thirty-sixth technical solution, arcs are generated in each of the plurality of contact groups each consisting of a movable contact and a fixed contact, so that the arc voltage of each arc becomes small, thereby promoting arc extinguishing.

[0480] The circuit disconnecting device (100) of the 37th technical solution is provided with a locking mechanism (19) in addition to any one of the 26th to 36th technical solutions. The locking mechanism (19) holds the movable contact (3) at the isolated position where the movable contact (31) is pulled away from the fixed contact (11).

[0481] According to the 37th technical solution, the locking mechanism (19) can be used to prevent the movable contact (3) from returning (rebounding) toward the fixed terminal (1) side.

[0482] The circuit disconnection device (100) of the 38th technical solution is based on the 37th technical solution, and the locking mechanism (19) has a permanent magnet (191).

[0483] According to the 38th technical solution, it is possible to prevent the movable contact (3) from returning to the fixed terminal (1) side.

[0484] The circuit disconnecting device (100) of the 39th technical solution is based on the 37th or 38th technical solution, wherein the locking mechanism (19) has a limiting portion (193). The limiting portion (193) limits the movement of the movable contact (3) toward the fixed terminal (1) by mechanically coupling with the movable contact (3).

[0485] According to the 39th technical solution, it is possible to prevent the movable contact (3) from returning to the fixed terminal (1) side.

[0486] The circuit disconnecting device (100) of the 40th technical solution is based on any one of the 37th to 39th technical solutions, wherein the locking mechanism (19) includes a resin member (194). The resin member (194) is deformed by the collision of the movable contact (3).

[0487] According to the 40th technical solution, it is possible to prevent the movable contact (3) from returning to the fixed terminal (1) side.

[0488] According to a 41st technical solution, the circuit disconnecting device (100) is based on the 40th technical solution, wherein the movable contact (3) has a protrusion (195) protruding in a direction toward the resin member (194).

[0489] According to the 41st technical solution, by inserting the protrusion (195) into the resin component (194), it is possible to prevent the movable contact (3) from returning to the fixed terminal (1) side.

[0490] Description of Reference Numerals

[0491] 100, circuit disconnecting device; 1, first fixed terminal (fixed terminal); 11, first fixed contact (fixed contact); 12, first electrode; 1404, fourth circuit chip (circuit chip); 2, second fixed terminal; 21, second fixed contact; 22, second electrode; 2404, fourth circuit chip (circuit chip); 3, movable contact; 31, first movable contact (movable contact); 32, second movable contact; 4, holding portion; 41, crimping spring (elastic portion); 421, 422, Permanent magnet; 43, latch mechanism; 51, igniter; 520, pressurizing chamber; 53, piston; 531, first end; 532, second end; 61, first yoke; 62, second yoke; 65, bimetallic member; 9, additional movable contact; 70, storage chamber; 8, magnetic flux generating portion; 80, arc extinguishing member; 86, arc extinguishing gas generating member; 87, gas; 88, arc extinguishing body; 19, locking mechanism; 191, permanent magnet; 193, limiting portion; 194, resin member; 195, protrusion.

Claims

1. A cutting device, wherein: The cutting device comprises: a first fixed terminal including a first fixed contact; a second fixed terminal including a second fixed contact located to the right of the first fixed contact; A movable contact, comprising a first end portion provided with a first movable contact, a second end portion provided with a second movable contact, and an intermediate portion connecting the first end portion and the second end portion, wherein the first movable contact is located below the first fixed contact, and the second movable contact is located below the second fixed contact, and the movable contact is configured to be movable from a first position to a second position, wherein when the movable contact is in the first position, the first movable contact contacts the first fixed contact and the second movable contact contacts the second fixed contact, and when the movable contact is in the second position, the first movable contact does not contact the first fixed terminal and the second movable contact does not contact the second fixed terminal; an upper yoke disposed above the middle portion of the movable contact; and an actuator including a piston disposed above the upper yoke and an igniter for generating gas to move the piston downward, When the igniter generates the gas, the piston moves the movable contact to the second position in a state where the upper yoke is located between the piston and the intermediate portion of the movable contact.

2. The cutting device according to claim 1, wherein: The disconnecting device further includes a lower yoke disposed below the intermediate portion of the movable contact. When the igniter generates the gas, the piston moves the movable contactor to the second position in a state in which the intermediate portion of the movable contactor is located between the upper yoke and the lower yoke.

3. The cutting device according to claim 1, wherein: The igniter is arranged above the piston. The piston is disposed at a position between the igniter and the upper yoke.

4. The cutting device according to claim 3, wherein: The igniter includes gunpowder and a heating element for burning the gunpowder. The lower wall of the igniter, which is opposite to the piston, has a strength sufficient to be broken by the pressure of the gas generated by the combustion of the gunpowder.

5. The cutting device according to claim 3, wherein: A gap is formed between the igniter and the piston.

6. The cutting device according to claim 1, wherein: The disconnecting device further includes a housing that accommodates the first fixed contact, the second fixed contact, the movable contact, and the upper yoke. A through hole is formed in the upper wall of the housing at a position overlapping with a middle portion of the movable contact in a plan view, and the actuator is arranged in the through hole.

7. The cutting device according to claim 1, wherein: The actuator further comprises a sleeve for accommodating the piston. The sleeve has a cylindrical portion whose diameter decreases as it goes downward. The piston that has moved the movable contactor to the second position is held by the cylindrical portion.

8. The cutting device according to claim 1, wherein: The actuator further comprises a first holding spring, A retaining groove is formed on the side of the piston. When the movable contact is at the first position, the first holding spring contacts the holding groove to hold the piston.

9. A cutting device, wherein: The cutting device comprises: a first fixed terminal including a first fixed contact; a second fixed terminal including a second fixed contact located to the right of the first fixed contact; A movable contact, comprising a first end portion provided with a first movable contact, a second end portion provided with a second movable contact, and an intermediate portion connecting the first end portion and the second end portion, wherein the first movable contact is located below the first fixed contact, and the second movable contact is located below the second fixed contact, and the movable contact is configured to be movable from a first position to a second position, wherein when the movable contact is in the first position, the first movable contact contacts the first fixed contact and the second movable contact contacts the second fixed contact, and when the movable contact is in the second position, the first movable contact does not contact the first fixed terminal and the second movable contact does not contact the second fixed terminal; a lower yoke disposed below the middle portion of the movable contact; and an actuator including a piston disposed above the intermediate portion and an igniter for generating gas to move the piston downward, When the igniter generates the gas, the piston moves the movable contactor to the second position in a state in which the lower yoke is located below the intermediate portion of the movable contactor.

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