JP2013246872A - Contact device - Google Patents

Abstract

Provided is a contact device capable of suppressing the backflow of metal vapor to a contact portion in a sealed container for hermetically sealing the contact portion.
A contact portion comprising a pair of fixed terminals 1 having a fixed contact 10 and a movable contact 2, a sealing container 4 for hermetically sealing the contact portion, and an arc for driving in a direction away from the contact portion. A pair of permanent magnets 42 and an isolation member 9 comprising partition walls 91 and 92 surrounding the contact portion in the sealing container 4. The isolation member 9 divides the space in the sealing container 4 into the isolation member 9. The first space S1 and the second space S2 are connected to the first partition wall portion 91 that is separated from the first space S1 on the inner side and the second space S2 on the outer side of the separating member 9 and that faces the driving direction of the arc. A vent hole 91A is provided.
[Selection] Figure 1

Description

  The present invention relates to a contact device.

  Conventionally, a technique for extinguishing an arc in an arc extinguishing chamber of a switch is known. The conventional example described in Patent Document 1 relates to an arc extinguishing chamber of a switch, and an arc generated at the time of electromagnetic interruption is magnetically induced by a strong magnetic plate provided around the arc generating portion, and the arc generating portion and the strong magnet The arc is distributed by a grid provided in the middle of the plate. In this conventional example, the arc is extinguished by discharging the arc gas whose pressure has decreased to the outside through a hole provided in the ferromagnetic plate.

Japanese Utility Model Publication No. 55-173839

  By the way, in recent contact devices, in order to quickly cool and extinguish the arc, for example, cooling gas mainly composed of hydrogen gas is enclosed in the arc extinguishing space. In order to prevent the cooling gas from leaking to the outside, a contact portion composed of a fixed contact and a movable contact that are in contact with and away from each other is hermetically sealed in a sealing container.

  Here, when the temperature of each fixed contact or movable contact rises due to arc discharge accompanying opening and closing of the contact, each fixed contact and movable contact may melt and a large amount of metal vapor may be generated. When this metal vapor fills the vicinity of the contact portion, there is a possibility that the contact breaking performance may be deteriorated, or the insulation performance between the contacts may be deteriorated to cause re-ignition. Furthermore, since the contact is consumed quickly, the life of the contact device may be shortened.

  In the above conventional example, since the arc is dispersed by the grid, it is considered that the metal vapor can also be dispersed. However, in the above conventional example, the arc gas is discharged to the outside, so that the contact portion is not hermetically sealed. Therefore, when the structure in which the contact portion is hermetically sealed with the sealing container in the above-described conventional example is adopted, the dispersed metal vapor may bounce off the inner wall of the sealing container and flow back to the contact portion again through the grid. .

  The present invention has been made in view of the above points, and provides a contact device capable of suppressing the backflow of metal vapor to the contact portion in a sealed container that hermetically seals the contact portion. With the goal.

  The contact device according to the present invention includes a pair of fixed terminals each having a fixed contact, a contact portion including a movable contactor contacting and separating from each fixed contact, a sealing container for hermetically sealing the contact portion, A pair of permanent magnets for driving an arc generated in the contact portion in a direction away from the contact portion; and a separating member including a partition wall portion surrounding the contact portion in the sealed container, and the separating member includes: A space in the sealed container is divided into a first space inside the isolation member and a second space outside the isolation member, and the partition wall portion facing the driving direction of the arc has the first space. A vent hole that connects the space and the second space is provided.

  In this contact device, it is preferable that a notch connecting the first space and the second space is provided in the partition wall portion orthogonal to the arc driving direction of the isolation member.

  In this contact device, it is preferable that a leg portion for supporting the bottom portion is provided at a bottom portion of the isolation member so as to be spaced apart from an inner wall of the sealing container.

  In the present invention, by installing an isolation member in the sealed container, the space in the sealed container is divided into a first space and a second space, and the metal vapor generated by the arc discharge is present in the contact portion. The first space is moved from the first space to the second space. And in this invention, since metal vapor | steam spread | diffuses so that it may spread over the whole 2nd space, it can suppress that metal vapor | steam flows back to a contact part in the sealing container which airtightly seals a contact part.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of the contact apparatus which concerns on this invention, (a) is principal part sectional drawing seen from the front, (b) is sectional drawing seen from upper direction, (c) is a perspective view of an isolation member. It is. It is sectional drawing which shows the basic composition of the contact apparatus which concerns on this invention. It is a figure which shows the other structure of Embodiment 1 of the contact apparatus which concerns on this invention, (a) is sectional drawing seen from upper direction, (b) is a perspective view of an isolation member. It is a figure which shows Embodiment 2 of the contact apparatus which concerns on this invention, (a) is principal part sectional drawing seen from the front, (b) is sectional drawing seen from upper direction, (c) is a perspective view of an isolation member. It is. It is a figure which shows Embodiment 3 of the contact apparatus which concerns on this invention, (a) is principal part sectional drawing seen from the front, (b) is a perspective view of an isolation member.

(Embodiment 1)
Hereinafter, a contact device according to a first embodiment of the present invention will be described with reference to the drawings. In the following description, the top, bottom, left, and right in FIG. 2 are defined as the top, bottom, left, and right directions, the front side of the page is the front direction, and the back side of the page is the back direction. In the present embodiment, as shown in FIG. 2, the contact block A1 and the electromagnet block B1 are integrally combined and housed in a hollow box-shaped housing (not shown). In FIG. 2, illustration of a separating member 9 described later is omitted.

  The contact block A <b> 1 includes a pair of fixed terminals 1, a movable contact 2, a holding member 3, and a sealing container 4. Each fixed terminal 1 is formed in a cylindrical shape from a conductive material such as copper. In the present embodiment, the lower end portion of each fixed terminal 1 becomes a fixed contact 10 that contacts and separates from the movable contact 2. Each fixed contact 10 may be provided by fixing a contact material to the lower end of each fixed terminal 1. Each fixed terminal 1 is inserted through a pair of through holes 40A of a case 40 described later. In addition, a flange 11 exposed to the outside of the case 40 is formed at the upper end of each fixed terminal 1. Each flange portion 11 is joined to the case 40 by brazing while protruding from the upper surface of the case 40.

  The movable contact 2 is formed in a rectangular flat plate shape, and is arranged at a position facing each fixed contact 10 at a predetermined interval along the vertical direction. Further, a positioning protrusion 2A that protrudes downward and fits into an upper end of a contact pressure spring 33 described later is integrally formed at the center of the lower surface of the movable contact 2. The movable contact 2 is sandwiched by a holding member 3 that holds a contact pressure spring 33.

  The holding member 3 includes a top plate 30 and a bottom plate 31 each formed in a rectangular plate shape, and a pair of side plates 32. The top plate 30 contacts the upper surface of the movable contact 2, and the bottom plate 31 faces the top plate 30 with the movable contact 2 and the contact pressure spring 33 interposed therebetween. The top plate 30 and the bottom plate 31 sandwich and hold the movable contact 2 and the contact pressure spring 33. One side plate 32 connects the front end portion of the top plate 30 and the front end portion of the bottom plate 31 in front of the movable contact 2. The other side plate 32 connects the rear end portion of the top plate 30 and the rear end portion of the bottom plate 31 behind the movable contact 2.

A positioning protrusion 31 </ b> A that protrudes upward and fits to the lower end of the contact pressure spring 33 is integrally formed at the center of the upper surface of the bottom plate 31. Further, from the bottom surface of the bottom plate 31, a cylindrical protrusion 31B protruding downward is integrally formed. A cylindrical boss 31C through which the upper end of the movable shaft 20 is inserted is integrally formed at the center of the bottom of the protrusion 31B. The movable shaft 20 is formed in the shape of a long bar along the vertical direction, and its upper end is fixed in the boss portion 31C.
The lower end portion of the movable shaft 20 is fixed to the movable iron core 7 in a state of being inserted into an insertion hole 70 of the movable iron core 7 described later.

  The contact pressure spring 33 is formed of a coil spring, and is positioned with respect to the bottom plate 31 by fitting the positioning protrusion 31A of the bottom plate 31 of the holding portion 3 to the inner diameter portion of the lower end portion thereof. Further, the contact pressure spring 33 is positioned with respect to the movable contact 2 by fitting the positioning protrusion 2 </ b> A of the movable contact 2 to the inner diameter portion of the upper end portion thereof. That is, the movable contact 2 and the contact pressure spring 33 are sandwiched by the top plate 30 and the bottom plate 31 of the holding member 3 along the extending and contracting direction of the contact pressure spring 33, and the contact pressure spring 33 is in a compressed state.

  The sealing container 4 includes a case 40 and a flange 41. The case 40 is formed in a hollow box shape whose bottom surface is opened from an insulating and heat-resistant material such as ceramic, and a pair of through holes 40A are formed through the top surface. And the upper edge of the flange 41 is joined to the opening periphery of the case 40 by brazing. Furthermore, by joining the lower end edge of the flange 41 to the upper surface of the first yoke plate 60 described later, the sealing container 4 that hermetically seals the contact portions including the fixed contacts 10 and the movable contact 2 is completed. Inside the sealing container 4, a mixed gas mainly containing hydrogen is sealed. For this reason, it is possible to cool the arc that is generated when the contact is opened and closed.

  A pair of plate-like permanent magnets 42 are in contact with the outer surfaces of the front and rear walls of the case 40 as shown in FIG. These permanent magnets 42 generate a magnetic field B1 in the sealed container 4 in a direction from the rear permanent magnet 42 toward the front permanent magnet 42. Here, when the current I1 flows through the movable contact 2 when the contact is closed, an upward and downward arc current is generated between the fixed contact 10 and the movable contact 2 when the contact is opened and closed. Due to the arc current and the magnetic field B1, a left Lorentz force F1 acts on the arc current between the left fixed contact 10 and the movable contact 2. Similarly, a right-handed Lorentz force F <b> 1 acts on the arc current between the fixed contact 10 on the right side and the movable contact 2. By this Lorentz force F1, the arc can be driven and stretched away from the contact portion.

  The electromagnet block B <b> 1 includes a coil bobbin 5 that winds the excitation winding 53, a yoke 6, a movable iron core 7, and a fixed iron core 8. The coil bobbin 5 is made of a resin material, and includes a cylindrical portion 50 around which the excitation winding 53 is wound, and a first flange portion 51 and a second flange portion 52 formed on both upper and lower ends of the cylindrical portion 50, respectively. On the upper surface of the first flange 51, a concave portion 51A that is recessed downward is provided. Further, the inner diameter on the lower end side of the cylindrical portion 50 is larger than the inner diameter on the upper end side.

  Excitation winding 53 has ends connected to a pair of terminal portions (not shown) provided on first flange 51. Each terminal portion is connected to a pair of coil terminals (not shown) via lead wires (not shown). Therefore, a current is supplied from the external power source to the excitation winding 53 via each coil terminal.

  The yoke 6 includes a first yoke plate 60 disposed on the upper end side of the coil bobbin 5, a second yoke plate 61 disposed on the lower end side of the coil bobbin 5, and the first yoke plate 60 side from the left and right ends of the second yoke plate 61. And a pair of third yoke plates 62 extending in the direction. The first yoke plate 60 is formed in a rectangular plate shape. An insertion hole 60 </ b> A is provided in the center of the first yoke plate 60.

  A cylindrical member 54 having a bottomed cylindrical shape with a flange 54A formed at the upper end is inserted through the insertion hole 60A. The flange portion 54A is joined to the bottom surface of the recess 51A. A movable iron core 7 formed in a cylindrical shape from a magnetic material is accommodated in the lower end portion in the cylindrical member 54. A fixed iron core 8 formed in a cylindrical shape from a magnetic material is accommodated in an upper end portion in the cylindrical member 54 so as to face the movable iron core 7. An insertion hole 70 is formed in the movable iron core 7 along the axial direction. The lower end portion of the movable shaft 20 is inserted into the insertion hole 70 and fixed. A first recess 71 that is recessed downward is provided at the upper end of the movable iron core 7. A second boss portion 83 of the fixed iron core 8 to be described later is fitted into the first recess 71. Furthermore, a second recess 70 </ b> A that is recessed downward is provided in the center of the first recess 71.

  A cylindrical fourth yoke plate 63 formed integrally with the second yoke plate 61 is fitted into a gap formed between the inner circumferential surface of the lower end portion of the coil bobbin 5 and the outer circumferential surface of the cylindrical member 54. doing. The fourth yoke plate 63 forms a magnetic circuit together with the yoke plates 60 to 62, the movable iron core 7, and the fixed iron core 8.

  A cylindrical first boss portion 80 that protrudes upward and passes through the insertion hole 60 </ b> A of the first yoke plate 60 is integrally formed on the upper surface of the fixed iron core 8. The holding member 3 is positioned by inserting the protrusion 31 </ b> B of the holding member 3 into the first boss 80. Further, a cylindrical second boss portion 83 that protrudes downward and fits into the first recess 71 of the movable iron core 7 is integrally formed on the lower surface of the fixed iron core 8.

  The fixed iron core 8 is provided with an inner cylinder portion 81 communicating with the first boss portion 80 and the second boss portion 83. A recess 81A having a slightly larger diameter is provided at the lower end of the inner cylinder 81, and the return spring 82 is housed in a space surrounded by the recess 81A and the second recess 70A of the movable iron core 7. doing. The return spring 82 is formed of a coil spring, the lower end of which is in contact with the bottom surface of the second recessed portion 70 </ b> A of the movable iron core 7, and the upper end of which is in contact with the bottom surface of the recessed portion 81 </ b> A of the fixed iron core 8. Accordingly, the return spring 82 is housed in a compressed state between the bottom surface of the second recess 70A and the bottom surface of the recess 81A, and elastically biases the movable iron core 7 downward.

  Hereinafter, the opening / closing operation of the contact in this embodiment will be described with reference to FIG. In the present embodiment, in the initial state in which the excitation winding 53 is not energized, the movable iron core 7 is urged downward by the urging force of the return spring 82 and is stationary at a predetermined position. In addition, the movable shaft 20 connected to the movable iron core 7, the holding member 3, and the movable contact 2 held by the holding member 3 also move downward and are stationary at a predetermined position. For this reason, the movable contact 2 is separated from each fixed contact 10 in the initial state.

  When the excitation winding 53 is energized, the movable iron core 7 is attracted to the fixed iron core 8 and slides upward. At this time, the movable shaft 20 connected to the movable iron core 7, the holding member 3, and the movable contact 2 held by the holding member 3 also move upward in conjunction with each other. Thereby, although the movable contact 2 contacts each fixed contact 10, the movable iron core 7, the movable shaft 20, and the holding member 3 move slightly upward from this state. Then, the contact pressure spring 33 is compressed, and the movable contact 2 strongly contacts each fixed contact 10 by the urging force of the contact pressure spring 33, and the contacts are conducted.

  When the energization to the exciting winding 53 is turned off, the attractive force of the fixed iron core 8 is lost, and the movable iron core 7 moves downward by the biasing force of the return spring 82. At this time, the movable shaft 20 and the holding member 3 connected to the movable iron core 7 also move downward in conjunction with each other. Thereby, since the top plate 30 of the holding part 3 presses the movable contact 2 downward, the movable contact 2 and each fixed contact 10 are separated from each other, and the contacts are interrupted.

  By the way, as already described, when the contacts are opened and closed, a large amount of metal vapor MV1 is generated from each contact portion with arc discharge. In the present embodiment, in order to suppress the metal vapor MV1 from remaining in the vicinity of the contact portion, the isolation member 9 surrounding the contact portion is provided in the sealed container 4.

  As shown in FIG. 1C, the separating member 9 is formed in a rectangular parallelepiped shape having an open top surface, and includes a bottom wall portion 90, a pair of first partition portions 91, and a pair of second partition portions 92. Consists of. The bottom wall portion 90 is formed in a rectangular plate shape and abuts on the upper surface of the first yoke portion 60. A through hole 90 </ b> A for avoiding the first boss portion 80 of the fixed iron core 8 is provided through the center portion of the bottom wall portion 90. Each first partition wall 91 is formed in a rectangular plate shape, and protrudes upward from the left and right ends of the bottom wall 90. Each of the second partition walls 92 is formed in a rectangular plate shape and protrudes upward from both front and rear ends of the bottom wall 90.

  As shown in FIG. 1B, the first partition walls 91 are arranged in the sealing container 4 with a certain space between the left and right inner walls of the sealing container 4. As shown in FIG. 1B, the second partition walls 92 are arranged in the sealed container 4 with a certain space between the front and rear inner walls of the sealed container 4. In addition, the upper ends of the first partition portions 91 and the second partition portions 92 are all in contact with the upper inner wall in the sealing container 4. Therefore, the separating member 9 divides the space in the sealed container 4 into the first space S1 inside the separating member 9 and the second space S2 outside the separating member 9.

  In the present embodiment, as shown in FIG. 1C, a plurality of vent holes 91 </ b> A that connect the first space S <b> 1 and the second space S <b> 2 are provided in each first partition wall portion 91. Here, as already described, in this embodiment, the Lorentz force F1 that works by the magnetic field B1 by the pair of permanent magnets 42 and the arc current flowing between the contacts is used to make the arc away from the contact portion. It is stretched. Along with the movement of the arc by the Lorentz force F1, the metal vapor MV1 also moves away from the contact portion.

  Here, each 1st partition part 91 of the separating member 9 is arrange | positioned so that all may face the drive direction of an arc. Therefore, the metal vapor MV1 moves from the first space S1 to the second space S2 via the air holes 91A penetrating the first partition walls 91, as shown in FIG. In the vicinity of each air hole 91A, the pressure is high due to the metal vapor MV1 supplied from the first space S1, and a pressure difference is generated between the other part of the second space S2 excluding the vicinity of each air hole 91A. Therefore, the metal vapor MV1 that has moved to the second space S2 diffuses so as to reach the entire second space S2 along the outer walls of the first partition walls 91 and the second partition walls 92, and the metal vapor MV1 It does not flow backward into one space S1. Therefore, the metal vapor MV1 hardly remains in the first space S1, and as a result, the metal vapor MV1 can be suppressed from remaining in the vicinity of the contact portion.

  As described above, in this embodiment, by installing the isolation member 9 in the sealing container 4, the space in the sealing container 4 is partitioned into the first space S1 and the second space S2. In this embodiment, the metal vapor MV1 generated along with the arc discharge is moved from the first space S1 where the contact portion exists to the second space S2 by using the Lorentz force F1 for extending the arc. Yes. Furthermore, in the present embodiment, the metal vapor MV1 diffuses so as to reach the entire second space S2 due to the pressure difference, and therefore does not flow back into the first space S1. Therefore, in this embodiment, it can suppress that metal vapor | steam MV1 flows back to a contact part in the sealing container 4 which airtightly seals a contact part.

  As shown in FIG. 3A, each permanent magnet 42 may be provided on the outer surfaces of the left and right walls of the sealed container 4. In this configuration, a magnetic field B <b> 1 is generated in the sealed container 4 in a direction from the left permanent magnet 42 toward the right permanent magnet 42. Therefore, a downward Lorentz force F1 acts between the left fixed contact 10 and the movable contact 2, and an upward Lorentz force F1 acts between the right fixed contact 10 and the movable contact 2. Therefore, each of the second partition walls 92 faces the arc driving direction. Therefore, in this configuration, as shown in FIG. 3B, instead of penetrating the air holes 91A in the first partition walls 91 of the separating member 9, a plurality of air holes 92A are formed in the second partition walls 92. Each will penetrate. Thereby, even with this configuration, the same effects as described above can be obtained.

(Embodiment 2)
Hereinafter, a second embodiment of the contact device according to the present invention will be described with reference to the drawings. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, as shown in FIGS. 4A to 4C, the first space S <b> 1 and the second space are formed in the wall portion orthogonal to the arc driving direction of the separating member 9, that is, in each second partition wall portion 92. A notch 92B that connects S2 is provided. Each notch 92 </ b> B is formed by cutting out the central part in the left-right direction of each second partition wall 92 into a rectangular shape. In addition, the shape of each notch 92B is not limited to a rectangular shape, and may be another shape such as a circular shape.

  Hereinafter, the flow of the metal vapor MV1 in the present embodiment will be described with reference to FIG. First, as in the first embodiment, when the metal vapor MV1 is generated along with the arc discharge, the metal vapor MV1 moves from the first space S1 to the second space S2 via the first vent holes 91A by the Lorentz force F1. . The metal vapor MV1 that has moved to the second space S2 diffuses so as to spread over the entire second space S2, moves around the four corners of the isolation member 9 and moves toward the central portion in the left-right direction of the sealing container 4 (arrow AC1). See). Then, the metal vapor MV1 moves from the second space S2 to the first space S1 through the notches 92B, and returns to the contact portion again.

  In the process of diffusing the metal vapor MV1, the metal vapor MV1 is cooled by the mixed gas enclosed in the sealed container 4. Further, in this process, the metal substance contained in the metal vapor MV1 adheres to the inner wall of the sealed container 4 and the outer wall of the isolation member 9. Accordingly, the metal vapor MV1 (see arrow AC2) that is refluxed to the contact portion contains almost no metal substance, and even if it is contained, the amount is very small.

  As described above, in the present embodiment, the metal vapor MV1 cooled in the process of diffusing the second space S2 is refluxed to the contact portion through the notches 92B. For this reason, since a contact part can be cooled with the metal vapor | steam MV1 which circulates, the temperature rise of a contact part can be suppressed and generation | occurrence | production of metal vapor | steam can be suppressed. Moreover, since the movement of the metal vapor MV1 can be promoted by refluxing the metal vapor MV1 as compared with the first embodiment, the metal vapor MV1 hardly remains in the vicinity of the contact portion. Of course, as in the first embodiment, the metal vapor MV1 (metal vapor MV1 containing a large amount of metal substance) can be prevented from flowing back to the contact portion in the sealed container 4 that hermetically seals the contact portion. .

  As described in the first embodiment, each permanent magnet 42 may be provided on the outer surfaces of the left and right walls of the sealed container 4. In this configuration, instead of penetrating the air holes 91 </ b> A in the first partition walls 91 of the separating member 9, a plurality of air holes 92 </ b> A are formed in the second partition walls 92. In this configuration, instead of forming the notches 92B in the second partition walls 92, notches (not shown) may be formed in the first partition walls 91. Even with this configuration, the same effects as described above can be obtained.

(Embodiment 3)
Hereinafter, a third embodiment of the contact device according to the present invention will be described with reference to the drawings. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, as shown in FIGS. 5A and 5B, four leg portions 93 are provided on the bottom portion 90 of the separating member 9.

  Each leg portion 93 is integrally formed so as to protrude downward from the lower surface of the bottom portion 90. Each leg portion 93 supports the bottom portion 90 so as to be spaced apart from the lower inner wall of the sealed container 4. Thereby, in this embodiment, 3rd space S3 can be newly provided between the bottom part 90 and the inner wall of the lower side of the sealing container 4. FIG. The third space S3 is connected to the second space S2 as shown in FIG. Therefore, the metal vapor MV1 generated along with the arc discharge moves from the first space S1 to the second space S2, and further diffuses from the second space S2 to the third space S3.

  As described above, in the present embodiment, the third space S <b> 3 is provided between the lower inner wall of the sealing container 4 and the bottom portion 90 by providing the leg portion 93 on the bottom portion 90 of the isolation member 9. Thereby, in this embodiment, the metal vapor MV1 that diffuses the second space S2 is further diffused to the third space S3. Therefore, in this embodiment, compared with Embodiment 1, the metal vapor MV1 is less likely to remain in the vicinity of the contact portion.

  Note that, as described in the first embodiment, each permanent magnet 42 may be provided on the outer surfaces of the left and right walls of the sealed container 4. Further, as described in the second embodiment, the partition portions 91 and 92 may be formed with notches so that the metal vapor MV1 is refluxed to the contact portion.

1 Fixed terminal (contact part)
10 Fixed contact (contact part)
2 Movable contact (contact part)
4 Sealing container 42 Permanent magnet 9 Separating member 91A Vent MV1 Metal vapor S1 1st space S2 2nd space

Claims (3)

  A pair of fixed terminals each having a fixed contact; a contact portion comprising a movable contact contacting and separating from each fixed contact; a sealing container for hermetically sealing the contact portion; and an arc generated at the contact portion. A pair of permanent magnets for driving in a direction away from the contact portion; and an isolation member comprising a partition wall portion surrounding the contact portion in the sealing container, wherein the isolation member is a space in the sealing container Are separated from the first space inside the isolation member and the second space outside the isolation member, and in the partition portion facing the driving direction of the arc, the first space and the second space A contact device characterized by providing a vent hole for connecting the two.   2. The contact device according to claim 1, wherein a notch that connects the first space and the second space is provided in the partition wall portion orthogonal to the arc drive direction of the isolation member.   The contact device according to claim 1, wherein a leg portion that supports the bottom portion is provided at a bottom portion of the isolation member so as to be spaced apart from an inner wall of the sealing container.

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