Closer

Abstract

The switch has a first fixed contact (10a), a second fixed contact (10b), a movable contact (20), at least a pair of permanent magnets (30), and a yoke. The movable contact (20) extends in a first direction, has a first movable contact point (21a) at a first end portion, and is disposed so as to be separable from / contactable with the first fixed contact (10a) in a second direction. The pair of permanent magnets (30) are arranged to sandwich the movable contact (20), and the surfaces facing the movable contact (20) in a third direction of the movable contact (20) are of the same polarity. The yoke surrounds the periphery of the movable contact (20) in the first direction and the third direction, and is connected to the surface on the opposite side of the surface of the permanent magnet (30) facing the movable contact (20). The yoke has a protrusion (42) protruding toward the movable contact (20) at a position opposite to the first end portion of the movable contact (20) in the first direction.

Description

Technical Field

[0001] The present invention relates to a switch disposed between a power source and a load. Background Art

[0002] There is known a switch that extinguishes an arc generated when contacts are separated by stretching the arc with a magnetic field. Patent Document 1 discloses a switch having: a contact block having a pair of fixed contacts, a movable contact, and an operating member, the pair of fixed contacts having fixed contact points, the movable contact having a pair of movable contact points, and the operating member being connected to the movable contact to bring the movable contact points into contact with or separate them from the fixed contact points; a magnetic field generating unit that generates a magnetic field near the contact block; and a magnetic line of force induction member. The magnetic field generating unit generates a magnetic field between the fixed contact point and the movable contact point in a direction along the extending direction of the movable contact. The magnetic line of force induction member is provided along the outer wall of the arc extinguishing chamber housing.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2011-204478 Summary of the Invention

[0004] Further, in the technique described in Patent Document 1, the magnetic line of force induction member is arranged along the magnetic line of force that passes through a pair of contact points of one fixed contact point and the movable contact point that comes into contact with or separates from the fixed contact point. However, compared with the technique described in Patent Document 1, there is a further desire for a switch that increases the arc driving force for driving an arc discharge that occurs just after the current is interrupted and that improves the interruption performance of the arc discharge regardless of the direction of current flowing through the movable contact.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to obtain a switch that can increase the arc driving force for driving an arc discharge that occurs just after the current is interrupted and that can improve the interruption performance of the arc discharge compared with the prior art regardless of the direction of current flowing through the movable contact.

[0006] In order to solve the above problems and achieve the object, the switch according to the present invention includes a first fixed contact, a second fixed contact, a movable contact, at least a pair of permanent magnets, and a yoke. The first fixed contact has a first fixed contact point. The second fixed contact is arranged at an interval in a first direction in which it is arranged with the first fixed contact. The movable contact extends in the first direction, has a first movable contact point provided at a position opposite to the first fixed contact point at a first end portion, and is arranged to be separable / contactable with the first fixed contact in a second direction perpendicular to the first direction. At least a pair of permanent magnets are arranged to sandwich the movable contact, and the surfaces facing the movable contact in a third direction perpendicular to the first direction and the second direction of the movable contact are of the same pole. The yoke surrounds the periphery of the movable contact in the first direction and the third direction, and is connected to the surface on the opposite side of the surface of the permanent magnet facing the movable contact, and is made of a magnetic material. The yoke has a protrusion protruding toward the movable contact at a position opposite to the first end portion of the movable contact in the first direction.

[0007] Effects of the Invention

[0008] According to the present invention, there is an effect that the arc driving force for driving the arc discharge occurring immediately after the current interruption can be increased, and the arc discharge interruption performance can be improved compared with the prior art regardless of the energization direction of the current flowing through the movable contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a front view showing an example of the appearance of the switch according to Embodiment 1.

[0010] Figure 2 It is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switch according to Embodiment 1.

[0011] Figure 3 It is a front view showing an example of the internal structure of the arc extinguishing chamber of the switch according to Embodiment 1.

[0012] Figure 4 It is Figure 3 a sectional view taken along line IV-IV.

[0013] Figure 5 It is a front view showing an example of the arrangement method of the permanent magnets in the switch according to Embodiment 1.

[0014] Figure 6 It is a front view showing an example of the arrangement method of the permanent magnets in the switch according to Embodiment 1.

[0015] Figure 7 It is a front view showing an example of the arrangement method of the permanent magnets in the switch according to Embodiment 1.

[0016] Figure 8 It is a front view showing an example of the arrangement method of the permanent magnet in the switch related to Embodiment 1.

[0017] Figure 9 It is a front view showing an example of the magnetic field distribution of the switch related to Embodiment 1.

[0018] Figure 10 It is a diagram showing an example of the driving direction of the arc discharge when separating the movable contact and the fixed contact in the switch related to Embodiment 1.

[0019] Figure 11 It is a diagram showing an example of the driving direction of the arc discharge when separating the movable contact and the fixed contact in the switch related to Embodiment 1.

[0020] Figure 12 It is an oblique view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 2.

[0021] Figure 13 It is a front view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 2.

[0022] Figure 14 It is Figure 13 Cross-sectional view XIV - XIV of

[0023] Figure 15 It is an oblique view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 3.

[0024] Figure 16 It is a front view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 3.

[0025] Figure 17 It is Figure 16 Cross-sectional view XVII - XVII of

[0026] Figure 18 It is an oblique view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 4.

[0027] Figure 19 It is a front view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 4.

[0028] Figure 20 It is Figure 19 Cross-sectional view XX - XX of

[0029] Figure 21It is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 5.

[0030] Figure 22 It is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 6.

[0031] Figure 23 It is a front view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 6.

[0032] Figure 24 Is Figure 23 The XXIV - XXIV cross-sectional view of

[0033] Figure 25 It is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 7.

[0034] Figure 26 It is a cross-sectional view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 8.

[0035] Figure 27 It is a cross-sectional view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 9.

[0036] Figure 28 It is a cross-sectional view showing an example of the state of arc discharge in the switch without the insulating plate being provided.

[0037] Figure 29 It is a cross-sectional view showing an example of the state of arc discharge in the switch without the insulating plate being provided.

[0038] Figure 30 It is a cross-sectional view showing an example of the state of arc discharge in the switch related to Embodiment 9.

[0039] Figure 31 It is a cross-sectional view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 10. Specific Embodiments

[0040] Hereinafter, the switch related to the embodiments of the present invention will be described in detail based on the drawings. In addition, the present invention is not limited by these embodiments.

[0041] Embodiment 1.

[0042] Figure 1This is a front view showing an example of the appearance of the switch related to Embodiment 1. In addition, the vertical direction and the horizontal direction are defined below as directions orthogonal to each other. Further, the direction orthogonal to the vertical direction and the horizontal direction is defined as the front-back direction. Specifically, the direction in which the movable contact and the fixed contact come into contact and out of contact, that is, the movable direction of the movable contact, described later is set as the front-back direction. The direction that traverses the front-back direction, that is, the lateral direction and along the length direction of the movable contact member is set as the vertical direction. The direction that traverses the front-back direction, that is, the lateral direction and along the width direction of the movable contact member is set as the horizontal direction. In addition, the front-back direction is a general term for the front direction and the back direction indicating opposite directions to each other, the vertical direction is a general term for the upper direction and the lower direction indicating opposite directions to each other, and the horizontal direction is a general term for the left direction and the right direction indicating opposite directions to each other. And, the vertical direction corresponds to the first direction, the front-back direction corresponds to the second direction, and the horizontal direction corresponds to the third direction.

[0043] The switch 1 has an arc extinguishing chamber 2a of the first phase and an arc extinguishing chamber 2b of the second phase adjacent to each other. The arc extinguishing chamber 2a of the first phase and the arc extinguishing chamber 2b of the second phase basically have the same internal structure, and the switch 1 basically has a vertically symmetric shape and a horizontally symmetric shape. In addition, the switch 1 only needs to have at least one arc extinguishing chamber. Further, hereinafter, when it is not necessary to distinguish between the arc extinguishing chamber 2a of the first phase and the arc extinguishing chamber 2b of the second phase, they are labeled as the arc extinguishing chamber 2.

[0044] Figure 2 This is an oblique view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 1, Figure 3 This is a front view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 1, Figure 4 This is Figure 3 a sectional view taken along line IV-IV. The arc extinguishing chamber 2 of the switch 1 has a first fixed contact member 10a, a second fixed contact member 10b, a movable contact member 20, a permanent magnet 30, and a magnetic yoke 40.

[0045] The first fixed contact member 10a is formed of a plate-like member extending in the vertical direction and having a stepped structure near the center in the vertical direction, and has a rectangular shape when viewed from the front-back direction. The first fixed contact member 10a is formed of, for example, a conductive material such as copper or aluminum or an alloy having them as a base material. The first fixed contact member 10a has a first fixed contact 11a at the end on the side where the second fixed contact member 10b is arranged in the vertical direction. The first fixed contact 11a is provided on the front-facing surface of the first fixed contact member 10a and has a plate-like shape. The first fixed contact 11a is formed of, for example, silver or an alloy thereof. The first fixed contact member 10a has a terminal 12a at the other end in the vertical direction. The terminal 12a is connected to, for example, the wiring on the power supply side.

[0046] The second fixed contact 10b is formed of a plate-shaped member that extends in the vertical direction and has a stepped structure near the center in the vertical direction, and is rectangular when viewed from the front-rear direction. The second fixed contact 10b is formed of, for example, a conductive material such as copper or aluminum, or an alloy based on them. The second fixed contact 10b is arranged at a predetermined interval from the first fixed contact 10a in the vertical direction. That is, the first fixed contact 10a and the second fixed contact 10b are arranged on the same straight line. The second fixed contact 10b has a second fixed contact point 11b at the end on the side where the first fixed contact 10a is arranged in the vertical direction. The second fixed contact point 11b is provided on the front-facing surface of the second fixed contact 10b and has a plate-shaped configuration. The second fixed contact point 11b is formed of, for example, silver or its alloy. The second fixed contact 10b has a terminal 12b at the other end in the vertical direction. The terminal 12b is connected to a wiring on the load side (not shown). Hereinafter, without distinguishing between the first fixed contact 10a and the second fixed contact 10b, the first fixed contact 10a and the second fixed contact 10b are referred to as fixed contacts 10a, 10b. In addition, without distinguishing between the first fixed contact point 11a and the second fixed contact point 11b, the first fixed contact point 11a and the second fixed contact point 11b are referred to as fixed contact points 11a, 11b.

[0047] The movable contact 20 is formed of a plate-shaped member that extends in the direction along the vertical direction in which the first fixed contact point 11a and the second fixed contact point 11b are arranged and has a uniform thickness in the front-rear direction. The movable contact 20 has a structure in which the central portion in the vertical direction is recessed backward compared to the end portions. The movable contact 20 is rectangular when viewed from the front-rear direction. The movable contact 20 is formed of, for example, a conductive material such as copper or aluminum, or an alloy based on them. The movable contact 20 is arranged at a predetermined interval in front of the first fixed contact 10a and the second fixed contact 10b. The movable contact 20 has a first movable contact point 21a having a plate-shaped configuration at the first end in the vertical direction, that is, one end, and a second movable contact point 21b having a plate-shaped configuration at the second end, that is, the other end. The first movable contact point 21a and the second movable contact point 21b are provided on the rear-facing surface of the movable contact 20. The first movable contact point 21a and the second movable contact point 21b are formed of, for example, silver or its alloy. Hereinafter, without distinguishing between the first movable contact point 21a and the second movable contact point 21b, the first movable contact point 21a and the second movable contact point 21b are referred to as movable contact points 21a, 21b.

[0048] The first fixed contact 11a and the first movable contact 21a face each other in the front-rear direction. The first movable contact 21a is arranged so as to be separable / contactable from the first fixed contact 11a. The second fixed contact 11b and the second movable contact 21b face each other in the front-rear direction. The second movable contact 21b is arranged so as to be separable / contactable from the second fixed contact 11b.

[0049] The permanent magnet 30 is arranged in the left-right direction of the movable contact member 20 so as to sandwich the movable contact member 20. In the upper half in the up-down direction of the movable contact member 20, a pair of permanent magnets 30 are arranged in the left-right direction sandwiching the movable contact member 20, and in the lower half in the up-down direction of the movable contact member 20, a pair of permanent magnets 30 are arranged in the left-right direction sandwiching the movable contact member 20. The surfaces of the pair of permanent magnets 30 on the side of the movable contact member 20 are of the same pole.

[0050] Figures 5 to 8 It is a front view showing an example of the arrangement method of the permanent magnets in the switch according to Embodiment 1. In Figure 5 it, the permanent magnets 30 are arranged such that the surfaces of all the permanent magnets 30 on the side of the movable contact member 20 are N poles. In Figure 6 it, the permanent magnets 30 are arranged such that the surfaces of all the permanent magnets 30 on the side of the movable contact member 20 are S poles. In Figure 7 it, the permanent magnets 30 are arranged such that the surfaces of the pair of permanent magnets 30 arranged in the upper direction on the side of the movable contact member 20 are S poles, and the surfaces of the pair of permanent magnets 30 arranged in the lower direction on the side of the movable contact member 20 are N poles. In Figure 8 it, the permanent magnets 30 are arranged such that the surfaces of the pair of permanent magnets 30 arranged in the upper direction on the side of the movable contact member 20 are N poles, and the surfaces of the pair of permanent magnets 30 arranged in the lower direction on the side of the movable contact member 20 are S poles. As described above, among the permanent magnets 30 arranged opposite to each other in the left-right direction, the opposite surfaces are of the same pole.

[0051] Return Figures 2 to 4, a magnet yoke 40 is connected to the surface of the permanent magnet 30 on the side opposite to the surface on the movable contact member 20 side. The magnet yoke 40 is a yoke portion made of a magnetic material. In Embodiment 1, the magnet yoke 40 is composed of four L-shaped members 41. The L-shaped member 41 is composed of a plate-shaped member that extends in the vertical direction along the movable contact member 20 and folds back to the left and right sides at the upper and lower ends of the movable contact member 20 in the vertical direction to form an L shape. That is, the L-shaped member 41 has a structure in which a plate-shaped first component portion 411 extending in the vertical direction and a plate-shaped second component portion 412 extending in the left and right directions are connected in an L shape. The dimension of the L-shaped member 41 in the front-rear direction is constant. When viewed from the front-rear direction, the upper, lower, left, and right directions of the movable contact member 20 are surrounded by four L-shaped members 41 to form a rectangular shape. A protrusion 42 protruding toward the movable contact member 20 side is provided at the end of the L-shaped member 41 on the second component portion 412 side. The protrusion 42 is provided at a position substantially the same as the position in the front-rear direction of the movable contact member 20 in a state where the movable contacts 21a, 21b do not contact the fixed contacts 11a, 11b. An example of the magnet yoke 40 is soft iron, permalloy, or silicon steel sheet.

[0052] Although not shown, the arc extinguishing chamber 2 of the switch 1 has a driving portion that moves the movable contact member 20 in the front-rear direction. The driving portion moves the movable contact member 20 in the direction from the movable contacts 21a, 21b toward the fixed contacts 11a, 11b. That is, the movable contact member 20 has a structure that can separate / contact the fixed contact members 10a, 10b in the front-rear direction. The opposing movable contacts 21a, 21b and fixed contacts 11a, 11b come into contact, whereby current can flow between the wiring connected to the terminal 12a of the first fixed contact member 10a and the wiring connected to the terminal 12b of the second fixed contact member 10b. In addition, when the opposing movable contacts 21a, 21b and fixed contacts 11a, 11b are in a non-contact state, that is, a separated state, current can be interrupted between the wiring connected to the terminal 12a of the first fixed contact member 10a and the wiring connected to the terminal 12b of the second fixed contact member 10b. In a state where the opposing movable contacts 21a, 21b and fixed contacts 11a, 11b are in contact and current is flowing, if the respective movable contacts 21a, 21b and fixed contacts 11a, 11b are separated, high-temperature arc discharge occurs between the movable contacts 21a, 21b and the fixed contacts 11a, 11b according to the circuit conditions. Since the arc discharge has conductivity and current can flow through it, the circuit current can be interrupted by interrupting the arc discharge. In order to improve the performance of the switch 1, it is necessary to interrupt the arc discharge as early as possible. As one of the effective methods for interrupting the arc discharge, there is a method of stretching the arc discharge by electromagnetic force to attenuate the arc discharge.

[0053] Figure 9It is a front view showing an example of the magnetic field distribution of the switchgear according to Embodiment 1. As an example of the arrangement of the permanent magnets, it is envisioned that Figure 5 the case where the permanent magnets 30 are arranged such that the surfaces on the movable contact 20 side of all the permanent magnets 30 are N poles, as shown. By the arrangement of the permanent magnets 30 according to Embodiment 1, a magnetic field is formed along the direction of the movable contact 20. In Figure 9 the magnetic force lines MF formed by this magnetic field are shown. The formed magnetic field is bilaterally symmetric with respect to the movable contact 20. In addition, since the protrusion 42 of the L-shaped member 41 protrudes toward the upper and lower ends of the movable contact 20, the magnetic flux density at the positions of the movable contacts 21a, 21b and the fixed contacts 11a, 11b is increased. As a result, the driving force against arc discharge is increased at the positions of the movable contacts 21a, 21b and the fixed contacts 11a, 11b.

[0054] Figure 10 and Figure 11 It is a diagram showing an example of the driving direction of arc discharge when separating the movable contact and the fixed contact in the switchgear according to Embodiment 1. Figure 10 An example of the driving direction of arc discharge when the current I flows through the movable contact 20 from the lower side to the upper side is shown. In this case, the arc discharge is driven in the directions of Da1 and Db1. Figure 11 An example of the driving direction of arc discharge when the current I flows through the movable contact 20 from the upper side to the lower side is shown. In this case, the arc discharge is driven in the directions of Da2 and Db2. As described above, regardless of the direction of the current I flowing through the movable contact 20, the arc discharge occurring between the movable contacts 21a, 21b and the fixed contacts 11a, 11b can be stretched long by electromagnetic force, and high current interruption performance can be obtained. In particular, by the protrusion 42 of the L-shaped member 41, the magnetic flux density in a predetermined range including the movable contacts 21a, 21b and the fixed contacts 11a, 11b can be increased, so that a high driving force against arc discharge can be obtained from just after the start of current interruption.

[0055] In Embodiment 1, the switch 1 includes: a first fixed contact 10a having a first fixed contact point 11a; a second fixed contact 10b disposed on an extension line in the extending direction of the first fixed contact 10a and having a second fixed contact point 11b; and a movable contact 20 having a first movable contact point 21a and a second movable contact point 21b. The movable contact 20 is movable in a direction in which the first movable contact point 21a and the second movable contact point 21b come into contact with or separate from the first fixed contact point 11a and the second fixed contact point 11b. The permanent magnet 30 is arranged such that the surfaces facing each other across the movable contact 20 in a direction perpendicular to the extending direction and the moving direction of the movable contact 20 are of the same pole. The movable contact 20 is surrounded in a rectangular shape by a magnetic yoke 40 formed of four L-shaped members 41, one end of which is disposed on the side of the permanent magnet 30 and the other end of which is disposed on the end side in the extending direction of the movable contact 20. Moreover, the L-shaped member 41 has a protrusion 42 protruding toward the end of the movable contact 20 on the end side in the extending direction of the movable contact 20. Thereby, a magnetic field in the direction of the movable contact 20 is generated, and the magnetic flux density in a predetermined range including the movable contact points 21a, 21b and the fixed contact points 11a, 11b is increased. As a result, immediately after the start of current interruption when the movable contact points 21a, 21b and the fixed contact points 11a, 11b separate from the contacting state, a driving force higher than that in the past is obtained against arc discharge. As a result, regardless of the energization direction of the current flowing through the movable contact 20, a higher interruption performance against arc discharge can be obtained compared to the past.

[0056] Embodiment 2.

[0057] Figure 12 FIG. is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switch according to Embodiment 2. Figure 13 FIG. is a front view showing an example of the internal structure of the arc extinguishing chamber of the switch according to Embodiment 2. Figure 14 is Figure 13 a sectional view taken along line XIV-XIV. In addition, the following describes parts different from Embodiment 1, and the same structural elements as those in Embodiment 1 are denoted by the same reference numerals and their description is omitted.

[0058] In Embodiment 1, the protrusion 42 is provided at a position substantially the same as the position in the front-rear direction of the movable contact 20 at the end on the side of the second component portion 412 of the L-shaped member 41. However, in Embodiment 2, the protrusion 42a provided at the end on the side of the second component portion 412 of the L-shaped member 41 has the same dimension in the front-rear direction as the other parts of the L-shaped member 41. In one example, the L-shaped member 41 as described above is formed by folding back the end on the side of the second component portion 412 toward the movable contact 20 side.

[0059] In Embodiment 2, the magnetic field is also left - right symmetric with respect to the movable contact 20, and a magnetic field along the direction of the movable contact 20 can be formed. In addition, due to the protrusion 42a provided at the end of the second component part 412 side of the L - shaped member 41, the magnetic flux density in a predetermined range including the movable contacts 21a, 21b and the fixed contacts 11a, 11b is increased. As a result, as in Embodiment 1, high arc interruption performance can be obtained regardless of the direction of the current flowing through the movable contact 20. In addition, in Embodiment 2, the second component part 412 side of the L - shaped member 41 can be folded back toward the movable contact 20 side to form the protrusion 42a. That is, the magnet yoke 40 and the protrusion 42a can be easily manufactured as one component, so the manufacturing cost can be reduced.

[0060] Embodiment 3.

[0061] Figure 15 It is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 3. Figure 16 It is a front view showing an example of the internal structure of the arc extinguishing chamber of the switch related to Embodiment 3. Figure 17 is Figure 16 the sectional view taken along XVII - XVII. In addition, the parts different from Embodiments 1 and 2 are described below, and the same structural elements as those in Embodiments 1 and 2 are denoted by the same reference numerals and their descriptions are omitted.

[0062] In Embodiment 3, a notch 43 is provided in a part of the protrusion 42b formed by folding back at the end of the second component part 412 side of the L - shaped member 41. In this example, in Embodiment 2, the part where the front protrusion 42a is removed becomes the notch 43, and the remaining rear protrusion 42a becomes the protrusion 42b related to Embodiment 3. The protrusion 42b is provided from above the fixed contacts 10a, 10b to a position substantially the same as the position in the front - rear direction of the movable contact 20 in a state where the movable contacts 21a, 21b do not contact the fixed contacts 11a, 11b. Thus, the magnetic flux density in a predetermined range including the movable contacts 21a, 21b and the fixed contacts 11a, 11b becomes high.

[0063] In Embodiment 3, a notch 43 is provided on the front side in the front-rear direction of the projection 42b provided at the end portion on the second component portion 412 side of the L-shaped component 41, and the projection 42b is provided within the range where the movable contacts 21a and 21b and the fixed contacts 11a and 11b are arranged. Thus, compared with the case of Embodiment 2, the magnetic flux density around the movable contacts 21a and 21b and the fixed contacts 11a and 11b can be increased. As a result, compared with the case of Embodiment 2, the driving speed against arc discharge can be increased, and higher breaking performance against arc discharge can be obtained. In addition, the notch 43 may be provided on either the front side or the rear side in the front-rear direction.

[0064] Embodiment 4.

[0065] Figure 18 is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switchgear according to Embodiment 4, Figure 19 is a front view showing an example of the internal structure of the arc extinguishing chamber of the switchgear according to Embodiment 4, Figure 20 is Figure 19 the XX-XX sectional view. In addition, the following describes the parts different from Embodiments 1 to 3, and the same structural elements as those in Embodiments 1 to 3 are denoted by the same reference numerals and their description is omitted.

[0066] In Embodiment 4, the magnet yoke 40 is composed of two U-shaped components 41A. The U-shaped component 41A has: a plate-shaped first component portion 411 that extends in the vertical direction; a plate-shaped second component portion 412 that extends in the horizontal direction; and a plate-shaped third component portion 413 that is arranged in parallel with the first component portion 411 and extends in the vertical direction. It has a structure in which the same-direction end portions of the first component portion 411 and the third component portion 413 are connected by the second component portion 412 to form a U-shape. The U-shaped component 41A is integrated in such a manner as to cover one end portion side in the vertical direction of the movable contact member 20 by connecting to the surface on the opposite side of the surface of the pair of permanent magnets 30 arranged in the horizontal direction that faces the movable contact member 20.

[0067] In addition, on the surface of the second component part 412 on the side of the movable contact 20, a projection 42c protruding toward the movable contact 20 is provided. In this example, similar to the first embodiment, the projection 42c is provided at a position substantially the same as the position in the front-rear direction of the movable contact 20 in a state where the movable contacts 21a and 21b do not contact the fixed contacts 11a and 11b. However, similar to the second embodiment, the projection 42c may also have a size the same as the size in the front-rear direction of the second component part 412 on the surface of the second component part 412 on the side of the movable contact 20. In addition, similar to the third embodiment, a notch 43 may be provided in a part of the projection 42c. As described above, the U-shaped member 41A of the fourth embodiment has a structure formed by integrally combining two L-shaped members 41 of the first to third embodiments. Thereby, the periphery of the movable contact 20 can be surrounded by two U-shaped members 41A.

[0068] In the fourth embodiment, two U-shaped members 41A are used to surround the periphery of the movable contact 20 in the up-down direction and the left-right direction. Thereby, based on the effects of the first to third embodiments, the following effects can be obtained, that is, the number of components constituting the magnet yoke 40 can be reduced compared to the cases of the first to third embodiments, and the cost can be reduced.

[0069] Embodiment 5.

[0070] Figure 21 FIG. is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switch of the fifth embodiment. In addition, the following describes the parts different from the first to fourth embodiments, and the same structural elements as those of the first to fourth embodiments are denoted by the same reference numerals and their description is omitted.

[0071] In the fifth embodiment, the switch 1 further has an insulating resin 31 on the surface of the permanent magnet 30 on the side of the movable contact 20. In addition, Figure 21 shows the case where the insulating resin 31 is provided only on the permanent magnet 30, but based on the permanent magnet 30, the insulating resin 31 may also be provided so as to cover the magnet yoke 40 and the projection 42b provided on the magnet yoke 40.

[0072] In addition, Figure 21 shows the case where the structure of the fifth embodiment is applied to the arc extinguishing chamber 2 of the switch 1 of the third embodiment, but the structure of the fifth embodiment may also be applied to the arc extinguishing chamber 2 of the switches 1 of the first, second, and fourth embodiments.

[0073] In Embodiment 5, an insulating resin 31 is provided on the surface of the permanent magnet 30 on the side of the movable contact member 20. By means of the insulating resin 31, the situation where the arc discharge generated and driven between the movable contacts 21a, 21b and the fixed contacts 11a, 11b comes into direct contact with the permanent magnet 30 is suppressed. As a result, there is an effect of being able to suppress the thermal demagnetization of the permanent magnet 30. In addition, when the permanent magnet 30 has conductivity, the permanent magnet 30 is protected by the insulating resin 31, thereby preventing insulation breakdown caused by contact with the arc discharge. In addition, there is also the following effect, that is, the arc discharge stretched by the magnetic flux is pushed by the insulating resin 31, and higher arc discharge interruption performance can be obtained.

[0074] Embodiment 6.

[0075] Figure 22 is a perspective view showing an example of the internal structure of the arc extinguishing chamber of the switchgear according to Embodiment 6, Figure 23 is a front view showing an example of the internal structure of the arc extinguishing chamber of the switchgear according to Embodiment 6, Figure 24 is Figure 23 the XXIV-XXIV sectional view. Figure 24 shows a situation where the arc discharge is driven. In addition, the following describes the parts different from those of Embodiments 1 to 5, and the same structural elements as those of Embodiments 1 to 5 are denoted by the same reference numerals and their description is omitted.

[0076] The switchgear 1 of Embodiment 6 has, in the structure of Embodiment 5, a convex portion 32 in which the insulating resin 31 extends in the vertical direction. The convex portion 32 is provided on the side of the insulating resin 31 on the movable contact member 20 side. In addition, the convex portion 32 is preferably provided at a position between the movable contact member 20 and the fixed contact members 10a, 10b in a state where the movable contacts 21a, 21b do not contact the fixed contacts 11a, 11b. As Figure 24 shown, when the arc discharge Arc generated and driven between the movable contacts 21a, 21b and the fixed contacts 11a, 11b is driven toward the permanent magnet 30 side, the arc discharge Arc is stretched by the convex portion 32 of the insulating resin 31. Thereby, the interruption performance of the arc discharge Arc can be further improved as compared with the case of Embodiment 5.

[0077] In addition, in this example, the insulating resin 31 having the convex portion 32 is provided only on the permanent magnet 30, but on the basis of the permanent magnet 30, the insulating resin 31 having the convex portion 32 may also be provided so as to cover the magnet yoke 40 and the protrusion 42b provided on the magnet yoke 40. In addition, in this example, the case where one convex portion 32 is provided in the front-rear direction is shown, but a plurality of convex portions 32 may also be provided in the front-rear direction.

[0078] And, in Figures 22 to 24In [the description], a case is shown where the structure of Embodiment 6 is applied to the arc chute 2 of the switch 1 of Embodiment 3. However, the structure of Embodiment 6 can also be applied to the arc chute 2 of the switches 1 of Embodiments 1, 2, and 4.

[0079] In Embodiment 6, an insulating resin 31 having a convex portion 32 extending in the vertical direction is provided on the surface of the permanent magnet 30 on the side of the movable contact 20. As a result, the arc discharge Arc generated and driven between the movable contacts 21a, 21b and the fixed contacts 11a, 11b is pressed by the convex portion 32, whereby the arc can be stretched longer, and higher arc interruption performance can be obtained compared with the cases of Embodiments 1 to 5.

[0080] Furthermore, in the above-described Embodiments 1 to 6, a case is shown where two pairs of permanent magnets 30 are arranged in the vertical direction with the movable contact 20 interposed therebetween. However, the same effect can also be obtained when one pair of permanent magnets 30 is arranged with the movable contact 20 interposed therebetween.

[0081] Embodiment 7.

[0082] Figure 25 [The figure] is a perspective view showing an example of the internal structure of the arc chute of the switch according to Embodiment 7. Furthermore, the parts different from those of Embodiments 1 to 6 will be described below, and the same structural elements as those of Embodiments 1 to 6 are denoted by the same reference numerals and their description is omitted.

[0083] The switch 1 has a first fixed contact 10a, a second fixed contact 10c, a movable contact 20A, a permanent magnet 30, and a magnet yoke 40. The first fixed contact 10a has the same structure as that described in Embodiment 1.

[0084] The second fixed contact 10c is formed of a rectangular plate-like member when viewed from the front-rear direction. The second fixed contact 10c has a terminal 12b at one end in the extending direction and a flexible conductor 50, which is a flexible conductor, at the other end. The flexible conductor 50 is formed of a flexible soft conductor such as a flat knitting wire or a flexible conductive thin plate. Similarly to Embodiment 1, the first fixed contact 10a and the second fixed contact 10c are arranged on the same straight line extending in the vertical direction.

[0085] The movable contact 20A is formed of a plate-like member that extends in the vertical direction along which the first fixed contact 10a and the second fixed contact 10c are arranged and has a uniform thickness in the front-rear direction. The movable contact 20A has a stepped structure at the central portion in the vertical direction. The movable contact 20A has a movable contact point 21c having a plate-like shape at the first end portion on the side of the first fixed contact 10a, i.e., at the end portion. In addition, the movable contact 20A is supported by the second fixed contact 10c via a flexible conductor 50 at the second end portion on the side of the second fixed contact 10c, i.e., at the end portion. That is, in Embodiment 7, the movable contact 20A and the second fixed contact 10c have a structure electrically connected by the flexible conductor 50. Further, if the conduction between the movable contact 20A and the second fixed contact 10c can be maintained and the movable contact 20A can be moved, the movable contact 20A and the second fixed contact 10c may be in contact with a certain degree of freedom instead of the flexible conductor 50. The movable contact 20A can be moved in the front-rear direction to be separated / contacted by a driving portion (not shown). Thereby, the movable contact point 21c contacts or separates from the first fixed contact point 11a.

[0086] The permanent magnets 30 are arranged in the left-right direction of the movable contact 20A with the movable contact 20A interposed therebetween. In this example, a pair of permanent magnets 30 are arranged such that the surfaces on the side of the movable contact 20A are of the same pole.

[0087] The magnet yoke 40 is provided to surround the side where the movable contact point 21c of the movable contact 20A is arranged among the left-right direction and the vertical direction with the movable contact 20A interposed therebetween. In the case of using the L-shaped member 41 shown in Embodiments 1, 2, 3, 5, and 6, the magnet yoke 40 is composed of two L-shaped members 41. In addition, in the case of using the U-shaped member 41A shown in Embodiment 4, the magnet yoke 40 is composed of one U-shaped member 41A. In any case, the magnet yoke 40 surrounds the periphery of the movable contact 20A except for the front-rear direction and the downward direction. In Figure 25 the example, the case where the magnet yoke 40 is composed of two L-shaped members 41 is shown. A protrusion 42b protruding toward the movable contact point 21c is provided at a position of the L-shaped member 41 opposite to the movable contact point 21c.

[0088] In addition, in Figure 25 the example, the case where the protrusion 42b described in Embodiment 3 is provided is shown, but any one of the protrusions 42, 42a, and 42c described in Embodiments 1, 3, and 4 may be provided. Further, the insulating resin 31 described in Embodiment 5 or the insulating resin 31 having a convex portion 32 described in Embodiment 6 may be provided on the surface of the permanent magnet 30 on the side of the movable contact 20A.

[0089] With the above-described structure, it is also possible to generate a high driving force against the arc discharge Arc that occurs when the movable contact 21c and the first fixed contact 11a are separated, as described in Embodiments 1 to 6.

[0090] The switch 1 of Embodiment 7 includes: a first fixed contact member 10a having a first fixed contact 11a; a movable contact member 20A having a movable contact 21c at one end corresponding to the first fixed contact 11a; and a second fixed contact member 10c that supports the other end of the movable contact member 20A through a flexible conductor 50. In addition, the switch 1 has a permanent magnet 30 in the left-right direction of the movable contact member 20A, and has a magnetic yoke 40 that covers the surface of the permanent magnet 30 on the side opposite to the movable contact member 20A side and the side where the movable contact 21c is disposed in the up-down direction. A projection 42b is provided at a position of the magnetic yoke 40 opposite to the movable contact 21c. With the above-described structure, the number of arc discharges Arc connected in series can be halved compared to Embodiments 1 to 6. In addition, compared to Embodiments 1 to 6, the second fixed contact 11b and the second movable contact 21b are not provided, the number of components can be reduced accordingly, and the contact portions connected in series are halved. Therefore, on the basis of the effects of Embodiments 1 to 6, an effect of being able to reduce the contact resistance can be obtained.

[0091] Embodiment 8.

[0092] Figure 26 It is a cross-sectional view showing an example of the internal structure of the arc extinguishing chamber of the switch according to Embodiment 8. Figure 26 For example, corresponding to Embodiment 6 Figure 23 in the XXIV-XXIV cross-sectional view. In addition, the following describes the parts different from Embodiments 1 to 7, and the same structural elements as those in Embodiments 1 to 7 are denoted by the same reference numerals and their descriptions are omitted.

[0093] In addition, in Figure 26 in the structural description of Embodiment 8, for convenience, a cover 60 that covers each arc extinguishing chamber 2 with respect to the switch 1 is depicted, but the shape is not limited to the shape shown in the figure. The cover 60 covers the up-down direction, the front-back direction, and the left-right direction of the space in which the movable contact member 20, the pair of permanent magnets 30, and the magnetic yoke 40 are disposed. In one example, the cover 60 is provided so as to cover the outer peripheral surface of the magnetic yoke 40 and the surfaces in the front direction and the back direction of the space surrounded by the magnetic yoke 40. That is, the cover 60 has side surfaces 60a perpendicular to the left-right direction, side surfaces perpendicular to the up-down direction, a front surface 60b perpendicular to the front direction, and a rear surface 60c perpendicular to the back direction. The first fixed contact member 10a and the second fixed contact member 10b are fixed to the rear surface 60c of the cover 60.

[0094] In the switch 1 according to Embodiment 8, at a position on the side opposite to the movable contacts 20 with respect to the movable contact member 20, there is also a resin plate 61 provided at a position parallel to the movable contact member 20 and spaced apart from the movable contact member 20. In one example, the resin plate 61 is a plate-like member formed of a heat-decomposable polymer material and is fixed to the front surface 60b of the cover 60. Alternatively, the resin plate 61 may be integrally formed with the front surface 60b of the cover 60. If an arc discharge Arc contacts the resin plate 61, decomposition gas is generated from the resin plate 61 due to the heat of the arc discharge Arc or the like. Moreover, the arc discharge Arc is cooled by the decomposition gas.

[0095] In addition, the space between the movable contact member 20 and the resin plate 61 is a space for stretching the arc discharge Arc, that is, an arc stretching space. Therefore, in order to sufficiently ensure this arc stretching space, it is preferable that the resin plate 61 is configured to be as thin as possible. In addition, Figure 26 An example of the arc mode when the arc discharge Arc is stretched into this arc stretching space is shown.

[0096] In addition, in the above description, the case where the resin plate 61 is provided in the structure of Embodiment 6 has been described, but the resin plate 61 can also be similarly provided in the structures of Embodiments 1 to 5 and Embodiment 7.

[0097] In Embodiment 8, the resin plate 61 is disposed in the arc stretching space on the side opposite to the movable contact 21a with respect to the movable contact member 20. Thus, when the arc discharge Arc is stretched, the arc discharge Arc contacts the resin plate 61, and decomposition gas is generated from the resin plate 61 due to the action of the heat of the arc discharge Arc or the like. Moreover, based on the effects of Embodiments 1 to 7, the following effect can be obtained, that is, the arc discharge Arc is cooled by the decomposition gas of this resin plate 61, and the performance of interrupting the arc discharge Arc can be improved.

[0098] Embodiment 9.

[0099] Figure 27 It is a cross-sectional view showing an example of the internal structure of the arc extinguishing chamber of the switch according to Embodiment 9. Figure 27 For example, it corresponds to XXIV-XXIV cross-sectional view in Figure 23 In addition, the following describes the parts different from Embodiments 1 to 8, and the same reference numerals are given to the structural elements the same as those in Embodiments 1 to 8 and the description thereof is omitted.

[0100] The switch 1 of Embodiment 9 further includes a plate-shaped insulating plate 62 extending in the front-rear direction and the up-down direction. The insulating plate 62 is arranged at a position spaced apart from the movable contact 20 on the side opposite to the movable contacts 21a and 21b with respect to the movable contact 20, and the extending direction of the insulating plate 62 is along the length direction of the movable contact 20. Specifically, at the central portion of the movable contact 20 in the left-right direction, the insulating plate 62 is arranged at a predetermined interval from the movable contact 20 such that the extending direction of the insulating plate 62 is parallel to the length direction of the movable contact 20. In Figure 27 the example, the insulating plate 62 is arranged so as to be substantially perpendicular to the front surface of the movable contact 20 along the length direction of the movable contact 20. In one example, the insulating plate 62 is formed of an insulating resin such as polyamide or an insulating resin containing a flame retardant. In one example, the thickness of the insulating plate 62 in the left-right direction is in the range of greater than or equal to 1 mm and less than or equal to 2 mm. The insulating plate 62 is fixed to the front surface 60b of the cover 60, for example. Alternatively, the insulating plate 62 may be integrally formed of the same material as the front surface 60b of the cover 60.

[0101] In addition, in the above description, the case where the insulating plate 62 is provided in the structure of Embodiment 6 has been described, but the insulating plate 62 may be similarly provided in the structures of Embodiments 1 to 5 and Embodiment 7.

[0102] Here, the effects obtained by providing the insulating plate 62 will be described. Figure 28 And Figure 29 is a cross-sectional view showing an example of the arc discharge state in the switch when the insulating plate is not provided. Figure 28 And Figure 29 For example, it corresponds to the XXIV-XXIV cross-sectional view in Figure 23 in Embodiment 6. Figure 28 And Figure 29 The switch 1 in

[0103] is the switch 1 shown in Embodiment 6, and the insulating plate 62 is not provided on the front surface 60b inside the cover 60. Figure 28 Figure 28 In the case where the insulating plate 62 is not provided, as shown in Figure 29 an arc discharge Arc occurs between the movable contacts 21a and 21b and the fixed contacts 11a and 11b. In addition, when the arc discharge Arc is driven toward the permanent magnet 30 side, the arc discharge Arc is stretched by the convex portion 32 of the insulating resin 31. The arc discharge Arc further changes from the state in Figure 29 as shown inThe rightward movement in []. When the current is large, high-temperature gas generated by arc discharge Arc is blown onto the first movable contact 21a and the first fixed contact 11a. As a result, the arc discharge Arc sometimes returns between the first movable contact 21a and the first fixed contact 11a again. As described above, when the insulating plate 62 is not provided, the arc interruption performance sometimes deteriorates.

[0104] Figure 30 It is a cross-sectional view showing an example of the state of arc discharge in the switch of Embodiment 9. Figure 30 For example, it corresponds to that of Embodiment 6 Figure 23 in the XXIV-XXIV cross-sectional view. In the switch 1 of Embodiment 9, as Figure 30 shown, in the space between the movable contact member 20 and the front surface 60b of the cover 60, there is an insulating plate 62 that protrudes from the front surface 60b toward the movable contact member 20 side and extends in the vertical direction, thereby restricting the movement of the arc discharge Arc in the left-right direction. As a result, based on the effects of Embodiments 1 to 7, the effect of being able to maintain high arc interruption performance can be obtained.

[0105] In addition, when the movable contact member 20 moves in the front-rear direction, it is desirable to set a predetermined interval so that the movable contact member 20 and the insulating plate 62 do not collide. On the other hand, if the interval is too large, the effect of restricting the movement of the arc discharge Arc becomes small. Therefore, the interval between the movable contact member 20 and the insulating plate 62 in the state where the movable contacts 21a, 21b do not contact the fixed contacts 11a, 11b is preferably less than or equal to 5 mm.

[0106] Embodiment 10.

[0107] Figure 31 It is a cross-sectional view showing an example of the internal structure of the arc extinguishing chamber of the switch of Embodiment 10. Figure 31 For example, it corresponds to that of Embodiment 6 Figure 23 in the XXIV-XXIV cross-sectional view. In addition, the following describes the parts different from Embodiments 1 to 9, and the same structural elements as those in Embodiments 1 to 9 are denoted by the same reference numerals and their description is omitted.

[0108] In the switch 1 of Embodiment 10, the cover 60 further has an exhaust port 64. In one example, the exhaust port 64 is provided on the side surface 60a of the cover 60. In addition, in Figure 31 it, the exhaust port 64 is provided at the end on the rear surface 60c side of the side surface 60a. In Figure 31 it, an example in which the exhaust port 64 is provided on the side surface 60a perpendicular to the left-right direction is shown, but it may also be provided on the side surface perpendicular to the up-down direction. In addition, in Figure 31In [the figure], an example in which two exhaust ports 64 are provided is shown, but it is sufficient to provide at least one exhaust port 64.

[0109] The switch 1 of Embodiment 10 has a gas flow path 63 inside the cover 60. The gas flow path 63 is provided between the outer surface of the magnet yoke 40 and the inner surface of the cover 60, and guides the gas toward the exhaust port 64 along the front surface 60b and the side surface 60a inside the cover 60. In Figure 31 In the example of [], the cover 60 is arranged in the front-rear direction so as to be in contact with the end of the magnet yoke 40 on the side where the fixed contact members 10a and 10b are arranged and not in contact with the end of the magnet yoke 40 on the side where the movable contact member 20 is arranged. That is, the gas flow path 63 is arranged so as to bypass the direction of the movable contacts 21a and 21b when viewed from the fixed contacts 11a and 11b.

[0110] Specifically, the gas flow path 63 is provided as a space between the side surface 60a in the left-right direction and the magnet yoke 40 inside the cover 60. In addition, the gas flow path 63 is provided as a space between the front surface 60b of the cover 60 and the front ends of the magnet yoke 40, the permanent magnet 30, and the insulating resin 31 inside the cover 60. Further, the gas flow path 63 can also be provided as a space between the side surfaces in the up-down direction and the magnet yoke 40 inside the cover 60. As described above, the cover 60 is arranged so that the side surfaces in the left-right direction and the front ends of the magnet yoke 40 do not contact the cover 60.

[0111] The gas generated by the arc discharge Arc flows through the gas flow path 63, and the gas is discharged from the exhaust port 64 to the outside of the cover 60.

[0112] In addition, in the above description, the case where the gas flow path 63 and the exhaust port 64 are provided in the structure of Embodiment 9 has been described, but the gas flow path 63 and the exhaust port 64 can be similarly provided in the structures of Embodiments 1 to 8.

[0113] In Embodiment 10, a gas flow path 63 provided along the front surface 60b and the side surface 60a inside the cover 60 and an exhaust port 64 connected to the gas flow path 63 are provided in the cover 60. Thus, when the internal pressure of the cover 60 rises due to the gas generated by the arc discharge Arc, the generated gas is guided to the gas flow path 63 and exhausted from the exhaust port 64, thereby obtaining a driving force for guiding the arc discharge Arc in the stretching direction. Therefore, the arc discharge Arc can be stretched more quickly to improve the breaking performance. In addition, the rise in the internal pressure can be reduced, so that the following effect can be obtained on the basis of the effects of Embodiments 1 to 9, that is, compared with the case where the gas flow path 63 and the exhaust port 64 are not provided in the cover 60, the strength of the cover 60 can be reduced, and the cost for manufacturing the switch 1 can be reduced.

[0114] Further, when viewed from the fixed contacts 11a and 11b, the gas flow path 63 is provided so as to bypass the directions of the movable contacts 21a and 21b. Thus, for example, when foreign matter intrudes from the outside through the exhaust port 64, it is possible to prevent the foreign matter from adhering to the vicinity of the movable contacts 21a and 21b and the fixed contacts 11a and 11b, thereby improving the reliability of contact.

[0115] The structure shown in the above embodiment represents an example of the content of the present invention, and can also be combined with other known techniques. Without departing from the gist of the present invention, a part of the structure can also be omitted or changed.

[0116] In addition, the above-described embodiment disclosed this time is an example in all aspects and does not serve as a basis for restrictive interpretation. Therefore, the technical scope of the present invention is not limited only by the above-described embodiment. In addition, it includes all changes within the scope equivalent to the claims.

[0117] Description of reference numerals

[0118] 1 Switch, 2, 2a, 2b Arc extinguishing chamber, 10a First fixed contact member, 10b, 10c Second fixed contact member, 11a First fixed contact, 11b Second fixed contact, 12a, 12b Terminals, 20, 20A Movable contact members, 21a First movable contact, 21b Second movable contact, 21c Movable contact, 30 Permanent magnet, 31 Insulating resin, 32 Protrusion, 40 Magnet yoke, 41 L-shaped member, 41A U-shaped member, 42, 42a, 42b, 42c Projections, 43 Cutout, 50 Flexible conductor, 60 Cover, 61 Resin plate, 62 Insulating plate, 63 Gas flow path, 64 Exhaust port, 411 First component part, 412 Second component part, 413 Third component part.

Claims

1. An opening and closing device, characterized in that, it has: a first fixed contact member having a first fixed contact point; a second fixed contact member disposed at an interval in a first direction in which it is arranged with the first fixed contact member; a movable contact member extending in the first direction, having a first movable contact point provided at a position opposite to the first fixed contact point at a first end portion, and being separably / contactably provided with the first fixed contact member in a second direction perpendicular to the first direction; at least a pair of permanent magnets configured to sandwich the movable contact member, and having the same pole on a surface opposite to the movable contact member in a third direction perpendicular to the first direction and the second direction of the movable contact member; and a yoke portion that surrounds the periphery of the movable contact member in the first direction and the third direction, and is connected to a surface opposite to the surface of the permanent magnet opposite to the movable contact member, and is made of a magnetic material, the yoke portion has a protrusion at a position opposite to the first end portion of the movable contact member in the first direction, the protrusion protruding toward the movable contact member and being continuous with the yoke portion through the same material as the yoke portion.

2. The opening and closing device according to claim 1, characterized in that, the yoke portion is connected to one of the pair of permanent magnets and is composed of a plurality of L-shaped members, the L-shaped members including a first component portion extending in the first direction and a second component portion extending from the position of the first component portion to the position of the movable contact member in the third direction in the third direction, the protrusion is provided at an end portion on the second component portion side of the L-shaped member.

3. The opening and closing device according to claim 2, characterized in that, the protrusion is formed by folding back an end portion on the second component portion side of the L-shaped member toward the movable contact member side in the first direction.

4. The opening and closing device according to claim 3, characterized in that, the L-shaped member has a notch in a part of the second direction of the protrusion.

5. The opening and closing device according to claim 1, characterized in that, the yoke portion is connected to one of the pair of permanent magnets and is composed of a U-shaped member, the U-shaped member including: a first component portion extending in the first direction; a second component portion connected to an end portion of the first component portion in the first direction and extending in the third direction; and a third component portion connected to the other permanent magnet of the pair of permanent magnets and connected to an end portion of the second component portion in the third direction and extending in the first direction.

6. The opening and closing device according to any one of claims 1 to 5, characterized in that, it further has an insulating resin that covers a surface of the yoke portion on the movable contact member side.

7. The opening and closing device according to claim 6, characterized in that, the insulating resin extends in the first direction and has a convex portion protruding toward the movable contact member side.

8. The opening and closing device according to any one of claims 1 to 5, characterized in that, the second fixed contact member has a second fixed contact point, The second end of the movable contact on the side opposite to the first end in the first direction has a second movable contact point, and the second movable contact point is arranged at a position opposite to the second fixed contact point.

9. The switch according to any one of claims 1 to 5, wherein, it further includes a conductor which electrically connects the movable contact and the second fixed contact at the second end of the movable contact on the side opposite to the first end in the first direction, and supports the movable contact on the second fixed contact.

10. The switch according to any one of claims 1 to 5, wherein, it further includes a resin plate which is arranged at an interval from the movable contact on the side opposite to the first movable contact point with respect to the movable contact, and is made of a thermally decomposable polymer material.

11. The switch according to any one of claims 1 to 5, wherein, it further includes an insulating plate which is arranged at an interval from the movable contact on the side opposite to the first movable contact point with respect to the movable contact, is arranged along the first direction, and extends in the first direction and the second direction.

12. The switch according to any one of claims 1 to 5, wherein, it further includes a cover which covers the first direction, the second direction and the third direction of the space where the movable contact, the pair of permanent magnets and the yoke are arranged, the cover has: an exhaust port; and a gas flow path which is connected to the exhaust port and is arranged between the outer side surface of the yoke and the inner side surface of the cover.

13. The switch according to claim 12, wherein, the exhaust port is arranged on the side of the cover in the second direction where the first fixed contact and the second fixed contact are arranged, the cover is arranged to contact the end of the yoke on the side where the first fixed contact and the second fixed contact are arranged in the second direction, and does not contact the end of the yoke on the side where the movable contact is arranged.

Images