JP2015220183A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device capable of rapidly extinguishing arc.SOLUTION: A contact device has a contact portion 4 having a fixed contact 2 and a movable contact 3, an arc-extinguishing frame 5 and a magnet 6 for generating magnetic field. A direction intersecting to both of a direction of magnetic field applied to the contact portion (left direction) and a moving direction of the movable contact 3 (up-and-down direction) is defined as an acting direction (front-and-rear direction). The arc-extinguishing frame 5 forms a flow passage 50 intercommunicating with at least one side (rear side) in the acting direction (front-and-rear direction) of a space containing the contact portion 4. The arc-extinguishing frame 5 has a ventilation hole 52 in the face at at least one side (rear side) of the contact portion 4 out of the faces confronting the contact portion 4 in the acting direction (front-and-rear direction).

Description

  The present invention relates generally to a contact device, and more particularly to a contact device comprising a fixed contact and a movable contact.

  2. Description of the Related Art Conventionally, there is a contact device that includes a fixed contact and a movable contact that moves between a closed position that contacts the fixed contact and an open position that moves away from the fixed contact. As this type of contact device, a contact device having an arc extinguishing chamber space for extinguishing an arc generated when the contact is opened is provided (see, for example, Patent Document 1). The arc is extinguished by being stretched by a magnetic field in the arc extinguishing chamber space.

Japanese Patent Laid-Open No. 11-312449

  However, the air in the arc extinguishing chamber space expands due to the heat of the arc, and the atmospheric pressure in the arc extinguishing chamber space increases. This increase in atmospheric pressure hinders the stretching of the arc, and it may take time to extinguish the arc.

  This invention is made | formed in view of the said reason, The objective is to provide the contact apparatus which can extinguish an arc rapidly.

  The contact device of the present invention includes a fixed contact, a contact portion having a movable contact that moves between a closed position that contacts the fixed contact and an open position that moves away from the fixed contact, and a magnet that generates a magnetic field, A direction intersecting both the direction of the magnetic field applied to the contact portion and the direction in which the movable contact moves is an action direction, and at least one side of the action direction with respect to a space including the contact portion An arc extinguishing frame that forms a flow path that communicates with the arc, and the arc extinguishing frame has a vent on at least one of the surfaces facing the contact portion in the working direction. It is characterized by that.

  In this contact device, it is preferable that the arc extinguishing frame is configured to surround the contact portion.

  In this contact device, it is preferable that the arc extinguishing frame has an intake hole on a surface opposite to the vent hole with respect to the contact portion in the action direction.

  In this contact device, it is preferable that the vent hole is provided on both surfaces of the arc extinguishing frame with respect to the contact portion in the action direction.

  This contact device preferably includes a plurality of the contact portions.

  In the contact device, it is preferable that the plurality of contact portions have the same direction of force acting on a current flowing between the fixed contact and the movable contact by the applied magnetic field.

  In this contact device, it is preferable that the arc extinguishing frame has an intake / exhaust hole on a surface between the plurality of contact portions in the action direction.

  In this contact device, it is preferable that the arc extinguishing frame has an asymmetric shape in the action direction.

  As described above, in the present invention, since the arc extinguishing frame has a vent hole, it is possible to prevent the expansion of the arc from being hindered by an increase in atmospheric pressure, so that the arc can be extinguished quickly. effective.

It is sectional drawing of the contact apparatus in Embodiment 1. FIG. 1 is a perspective view of a contact device in Embodiment 1. FIG. 1 is a front view of a contact device in Embodiment 1. FIG. It is sectional drawing which shows the modification of the contact device in Embodiment 1. It is sectional drawing which shows the modification of the contact device in Embodiment 1. It is sectional drawing which shows the modification of the contact device in Embodiment 1. It is a perspective view which shows the modification of the contact apparatus in Embodiment 1. FIG. It is sectional drawing which shows the modification of the contact device in Embodiment 1. It is a perspective view of the contact device in Embodiment 2. It is a front view of the contact apparatus in Embodiment 2. It is sectional drawing of the contact apparatus in Embodiment 2. FIG. It is sectional drawing which shows the modification of the contact apparatus in Embodiment 2. It is a perspective view which shows the modification of the contact apparatus in Embodiment 2. FIG. It is sectional drawing which shows the modification of the contact apparatus in Embodiment 2. It is a perspective view which shows the modification of the contact apparatus in Embodiment 2. FIG. It is a perspective view which shows the modification of the contact apparatus in Embodiment 2. FIG. It is a perspective view which shows the modification of the contact apparatus in Embodiment 2. FIG. It is a front view which shows the modification of the contact device in Embodiment 2. It is sectional drawing which shows the modification of the contact apparatus in Embodiment 2. It is sectional drawing which shows the modification of the contact apparatus in Embodiment 2. It is a perspective view which shows the modification of the contact apparatus in Embodiment 2. FIG. It is a front view which shows the modification of the contact device in Embodiment 2. It is sectional drawing which shows the modification of the contact apparatus in Embodiment 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
An external perspective view of the contact device 1 of the present embodiment is shown in FIG. 2, and a front view is shown in FIG. FIG. 1 is a cross-sectional view taken along the line AA in FIG. As shown in FIGS. 1 to 3, the contact device 1 of the present embodiment includes a fixed contact 2 and a movable contact 3 that moves between a closed position that contacts the fixed contact 2 and an open position that leaves the fixed contact 2. The contact part 4 which has, the arc-extinguishing frame 5, and the magnet 6 are provided.

  Below, the structure of the contact apparatus 1 of this embodiment is demonstrated in detail using FIGS. 1-3. Note that the description will be made by defining the vertical and horizontal directions in FIG. 3 as the vertical and horizontal directions. Further, the direction orthogonal to the up / down / left / right direction is defined as the front / rear direction, specifically, the direction from the back to the front in FIG. 3 (downward direction in FIG. 1) is the front direction, and the direction from the front to the back (FIG. 1). (Upward direction) is defined as the rear direction.

  As shown in FIG. 3, the contact device 1 of the present embodiment will be described as an example in which an electromagnetic relay 11 is configured together with an electromagnet device 10 that moves the movable contact 3. The application of the contact device 1 is not limited to the electromagnetic relay 11 and may be used for a switch, a breaker (circuit breaker), or the like.

  In the contact device 1 of the present embodiment, a contact portion 4 (a fixed contact 2 and a movable contact 3), an arc extinguishing frame 5, and a magnet 6 are housed in a rectangular parallelepiped case 7. The case 7 includes a main body 71 and a cover 72 attached to the main body 71. The main body 71 is formed in an L shape by a bottom plate 711 and a side plate 712 and constitutes a bottom portion and a left side wall of the case 7. The cover 72 is formed in a rectangular parallelepiped shape having a hollow structure in which the lower surface and the left surface are opened, and is attached to the main body 71 so that the opening of the lower surface and the left surface is covered with the main body 71.

  The fixed contact 2 is provided on a rectangular fixed contact plate 20 having a contact holding portion 21, a terminal portion 22, and a bent portion 23. The fixed contact plate 20 is composed of a metal plate whose longitudinal direction is the left-right direction and whose thickness direction is the up-down direction, and is provided along the bottom plate 711 of the main body 71. The fixed contact plate 20 is formed so that the right-end contact holding portion 21 is separated from the bottom plate 711 by two bent portions 23. Then, the fixed contact 2 is caulked to the contact holding portion 21, whereby the fixed contact 2 is fixed to the upper surface of the contact holding portion 21. The fixed contact plate 20 is provided so as to penetrate the side plate 712, and the terminal portion 22 protruding leftward from the side plate 712 is electrically connected to a power source (not shown), for example. In the present embodiment, the fixed contact plate 20 and the fixed contact 2 are configured separately. However, for example, the fixed contact plate 20 and the fixed contact are formed so as to form the fixed contact 2 by driving the fixed contact plate 20. 2 may be integrally formed.

  The movable contact 3 is provided on a rectangular plate-shaped movable contact plate 30 having a contact holding portion 31, a terminal portion 32, and a bent portion 33. The movable contact plate 30 is composed of a metal plate whose longitudinal direction is the left-right direction and whose thickness direction is the vertical direction, and is fixed to the side plate 712 so that the lower surface faces the upper surface of the fixed contact plate 20. The movable contact plate 30 is formed by two bent portions 33 so that the contact holding portion 31 on the right end side approaches the bottom plate 711. The movable contact 3 is caulked to the contact holding portion 31, so that the movable contact 3 is fixed at a position facing the fixed contact 2 in the vertical direction on the lower surface of the contact holding portion 31. The movable contact plate 30 is provided so as to penetrate the side plate 712, and the terminal portion 32 protruding to the left from the side plate 712 is electrically connected to, for example, a load (not shown). The movable contact plate 30 is also used as a plate spring having elasticity in the vertical direction. The movable contact plate 30 is closed using the elasticity of the movable contact plate 30 to contact the fixed contact 2 and the movable contact 3. Opening that separates from the fixed contact 2 is performed. In the present embodiment, the movable contact plate 30 and the movable contact 3 are configured separately. However, for example, the movable contact plate 30 and the movable contact 3 are formed so as to form the movable contact 3 by driving the movable contact plate 30. 3 may be integrally formed.

  The movable contact plate 30 is bent downward by a round bar-shaped movable shaft 73, so that the contact holding portion 21 and the movable contact 3 move downward. The movable shaft 73 is held movably in the vertical direction by a holding member 713 provided so as to protrude rightward from the side plate 712 of the case 7, and the lower end is in contact with the upper surface of the movable contact plate 30. Yes.

  The holding member 713 is formed in a rectangular parallelepiped shape, and is provided at a position above the movable contact plate 30 in the side plate 712. In addition, the holding member 713 has a hole 714 penetrating in the vertical direction, and the movable shaft 73 is passed through the hole 714 to hold the movable shaft 73 movably in the vertical direction. Further, a hole 721 that penetrates in the vertical direction is also formed on the upper surface of the cover 72, and the movable shaft 73 is provided so as to also penetrate the hole 721 of the cover 72. That is, the movable shaft 73 is held in a state of protruding from the case 7.

  The movable shaft 73 has a first flange 731 formed at the upper end, and the position where the lower surface of the first flange 731 contacts the upper surface of the cover 72 is the lower limit position of the movable shaft 73. Furthermore, the movable shaft 73 has a second collar portion 732 formed at a position below the holding member 713, and the position where the upper surface of the second collar portion 732 contacts the lower surface of the holding member 713 is This is the upper limit position of the movable shaft 73.

  The movable shaft 73 is moved downward by the electromagnet device 10 (see FIG. 3). The electromagnet device 10 has a conventionally well-known configuration including, for example, an excitation coil and a movable iron core (not shown). A movable iron core that moves downward by magnetic flux generated when the excitation coil is energized is connected to the movable shaft 73. When the exciting coil is energized and the movable iron core moves downward, a downward force is applied to the movable shaft 73, and the movable shaft 73 moves downward. The configuration of the electromagnet device 10 is not limited to the above.

  When the exciting coil is energized and the movable shaft 73 moves downward, the movable contact plate 30 is bent downward, and the contact holding portion 31 and the movable contact 3 move downward. As a result, the movable contact 3 comes into contact with the fixed contact 2, and the movable contact plate 30 and the fixed contact plate 20 are electrically connected.

  The movable contact plate 30 has elasticity in the vertical direction, and an upward force that causes the movable contact 3 to move away from the fixed contact 2 by a restoring force that attempts to return to the original state from the bent state. Act. When energization of the exciting coil is stopped and the downward force on the movable shaft 73 is released, the contact holding portion 21 is moved upward by the restoring force of the movable contact plate 30 and the movable contact 3 is separated from the fixed contact 2. .

Thus, the movable contact 3 moves in the vertical direction between a closed position that contacts the fixed contact 2 and an open position that is separated from the fixed contact 2. Here, the open contact where the movable contact 3 is separated from the fixed contact 2. In some cases, an arc may occur between the movable contact 3 and the fixed contact 2. In order to extinguish this arc, the contact device 1 of this embodiment includes a magnet 6.

  The magnet 6 is formed in a plate shape with the left-right direction as the thickness direction, and is disposed on the right side of the contact portion 4. The magnet 6 applies a magnetic field to the space including the contact portion 4. The Lorentz force acts on the arc by this magnetic field, and the arc can be extinguished by extending the arc. In the present embodiment, it is assumed that a current flows from the movable contact 3 toward the fixed contact 2 and a magnetic field in the left direction is applied to the space including the contact portion 4. In this case, the arc is stretched backward by the magnetic field. In FIG. 1, the direction in which the current flows is indicated by arrow Y1, the direction of the magnetic field is indicated by arrow Y2, and the direction in which the arc is stretched is indicated by arrow Y3.

  Further, the arc may generate a gas containing a metal or the like at a high temperature. Therefore, the contact device 1 according to the present embodiment includes an arc extinguishing frame 5 to prevent the metal contained in the gas from scattering and to prevent the arc from contacting the magnet 6.

  The arc extinguishing frame 5 is made of an electrically insulating insulator such as resin or ceramic, is formed in a rectangular parallelepiped shape, and has a flow path 50 along the front-rear direction. Further, the arc extinguishing frame 5 is configured to surround the contact portion 4. In order to store the contact portion 4 in the arc extinguishing frame 5, a rectangular hole 51 is formed from the upper end to the lower end in the central portion of the left side wall of the arc extinguishing frame 5 in the front-rear direction. By passing the fixed contact plate 20 and the movable contact plate 30 through the hole 51, the contact portion 4 (movable contact 3, fixed contact 2) is accommodated in the arc extinguishing frame 5. In addition, the hole 51 is formed in a rectangular shape with the vertical direction as the longitudinal direction, and the movable contact plate 30 can move in the vertical direction within the hole 51, so that the movable contact 3 has a closed position and an open position. Can move between. Further, the magnet 6 is disposed on the outer side (right side) of the arc extinguishing frame 5.

  As described above, since the arc is hot, the air in the arc extinguishing frame 5 is warmed and expanded by the heat of the arc. In the present embodiment, since the arc is stretched backward by the magnetic field, the air on the rear side of the contact portion 4 in the arc extinguishing frame 5 is particularly warmed and expanded.

  Therefore, the arc extinguishing frame 5 of the present embodiment has a vent hole 52 on the rear surface in the direction in which the arc is stretched. The vent hole 52 is formed on the entire rear surface of the arc extinguishing frame 5. Therefore, the air expanded by the heat of the arc flows backward along the flow path 50 and can be discharged out of the arc-extinguishing frame 5 through the vent hole 52. In FIG. 1, the flow of air discharged from the arc extinguishing frame 5 is indicated by an arrow Y4.

  As described above, the contact device 1 according to the present embodiment includes the contact portion 4 having the fixed contact 2 and the movable contact 3, the arc extinguishing frame 5, and the magnet 6 that generates a magnetic field. The movable contact 3 moves between a closed position in contact with the fixed contact 2 and an open position away from the fixed contact 2. In addition, a direction that intersects both the direction of the magnetic field applied to the contact portion 4 (left direction) and the direction in which the movable contact 3 moves (vertical direction) is defined as an action direction (front-rear direction). The arc extinguishing frame 5 forms a flow path 50 that communicates with at least one side (rear side) of the acting direction (front-rear direction) with respect to the space including the contact portion 4. Further, the arc extinguishing frame 5 has a vent hole 52 on at least one side (rear side) of the contact portion 4 among the surfaces facing the contact portion 4 in the action direction (front-rear direction).

  By providing the contact device 1 of the present embodiment with the above-described configuration, even when the air in the arc extinguishing frame 5 is warmed by the heat of the arc, the air is discharged through the vent hole 52. Further, the arc extinguishing frame 5 is formed with a vent hole 52 on the rear surface facing the contact portion 4 in the direction in which the arc is stretched (rearward direction). An increase in atmospheric pressure in the frame 5 is suppressed. Thereby, it is possible to prevent the stretching of the arc from being hindered by the increase in the atmospheric pressure inside the arc extinguishing frame 5. Therefore, the arc can be easily stretched and the arc can be extinguished quickly. By rapidly extinguishing the arc, the electrical disconnection between the fixed contact 2 and the movable contact 3 at the time of opening the contact is made quickly, and the interruption performance of the contact device 1 can be improved.

  The arc extinguishing frame 5 of the present embodiment has a configuration in which the entire rear surface is opened by one vent hole 52, but may have a configuration in which a plurality of holes are formed in the rear surface.

  Further, the arc extinguishing frame 5 is configured to surround the contact portion 4. Therefore, it is possible to suppress the scattering of metal or the like contained in the gas generated by the arc generated at the contact portion 4 and to prevent the metal from adhering to the fixed contact 2, the movable contact 3, and the like.

  Moreover, the arc-extinguishing frame 5 does not necessarily need to be integrally formed, and may be configured by combining a plurality of divided parts. Thereby, when the contact device 1 is assembled or the arc extinguishing frame 5 is manufactured, it is possible to cope with a case where it is convenient that the contact device 1 is composed of a plurality of parts.

  Next, a modified example of the contact device 1 of the present embodiment will be described. In addition, the modification of the structural member in the contact device 1 is distinguished by attaching A, B, C.

  The arc extinguishing frame 5 may be configured such that the portion that is in contact with the arc is made of an insulator having electrical insulation, and the portion that is not likely to be in contact with the arc is formed of something other than the insulator. Also good. For example, as shown in FIG. 4, the arc extinguishing frame 5 </ b> A has a side wall 501 on the front side of the contact portion 4 made of metal. That is, in the arc extinguishing frame 5A, the side wall 501 where there is no possibility of contact with the arc is made of a metal having higher strength than an insulator such as resin or ceramic. Therefore, the arc-extinguishing frame 5A can improve the strength as compared with the arc-extinguishing frame 5 made of only an insulator.

  Further, the arc extinguishing frame 5 may be configured to have a hole (air supply hole) on a surface on the opposite side (front side) to the contact hole 4 in the front-rear direction. As shown in FIG. 5, the arc extinguishing frame 5 </ b> B has an intake hole 53 formed on the left side wall on the front side of the contact portion 4. The arc extinguishing frame 5 </ b> B has the intake holes 53, so that air is sucked into the arc extinguishing frame 5 </ b> B through the intake holes 53 when the air is discharged from the vent holes 52. In FIG. 5, the flow of air sucked into the arc extinguishing frame 5 is indicated by an arrow Y5. As described above, the arc extinguishing frame 5B includes the intake holes 53 functioning as the air supply ports, whereby air supply and exhaust can be efficiently performed and the arc can be more easily stretched. Can be extinguished.

  Further, the arc extinguishing frame 5 may have a configuration in which the vent holes are provided on both sides of the arc extinguishing frame 5 with respect to the contact portion 4 in the front-rear direction. As shown in FIG. 6, the arc extinguishing frame 5 </ b> C has a vent hole 52 on the rear surface, and further has a vent hole 54 on the front surface. The vent hole 54 is formed on the entire front surface of the arc extinguishing frame 5C. When the current flows from the movable contact 3 toward the fixed contact 2, the arc is stretched backward, so that the air in the arc extinguishing frame 5 C is discharged from the vent hole 52 and is extinguished through the vent hole 54. Air is sucked into the arc frame 5B. On the other hand, when a current flows from the fixed contact 2 toward the movable contact 3, the arc is stretched forward, so that the air in the arc extinguishing frame 5 </ b> C is discharged from the vent hole 54 and is extinguished through the vent hole 52. Air is sucked into the arc frame 5B. That is, since the arc extinguishing frame 5C is open at the front surface and the rear surface, air supply and exhaust can be efficiently performed regardless of the direction of the current flowing between the movable contact 3 and the fixed contact 2. . Thereby, there is no need to limit the direction in which the current flows, regardless of the direction of the current flowing between the movable contact 3 and the fixed contact 2, the arc can be more easily stretched, and the arc can be extinguished more quickly. it can.

  Further, in the configuration of the contact device 1 described above, the arc extinguishing frame 5 is provided so as to surround the contact portion 4, but a configuration in which the contact portion 4 is provided outside the arc extinguishing frame 5 may be employed. . As shown in FIGS. 7 and 8, the arc extinguishing frame 5 </ b> D is formed in a rectangular parallelepiped shape whose longitudinal direction is the left-right direction, and is a flow path that is formed along the left-right direction and leads to a space including the contact portion 4. 50A. Further, the arc extinguishing frame 5D has an opening 55 on the left surface and a vent hole 56 on the right surface. And the arc-extinguishing frame 5D is arrange | positioned on the right side with respect to the contact part 4 so that the contact part 4 may be located in the outer side of the arc-extinguishing frame 5D. The magnet 6A has a thickness direction in the front-rear direction and is disposed on the rear side of the arc extinguishing frame 5D, and generates a backward magnetic field in the space including the contact portion 4 and the space in the arc extinguishing frame 5D.

  When a current flows from the movable contact 3 toward the fixed contact 2, the arc is stretched in the right direction and is drawn into the arc extinguishing frame 5 </ b> D through the opening 55. Since the arc extinguishing frame 5D has the vent hole 56 on the right side, the air in the arc extinguishing frame 5D expanded by the heat of the arc is discharged through the vent hole 56. Therefore, the arc can be easily stretched, so that the arc can be extinguished quickly.

(Embodiment 2)
The contact device 1 according to the first embodiment is configured to include one contact portion 4, whereas the contact device 1 according to the present embodiment includes two contact portions 4. In addition, about the structure similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted. FIG. 9 is an external perspective view of the contact device 1 of the present embodiment, and FIG. 10 is a front view thereof. FIG. 11 is a cross-sectional view taken along the line BB in FIG. In the present embodiment, the illustration of the cover 72 is omitted.

  The contact device 1 of this embodiment includes two contact portions 4 (a fixed contact 2 and a movable contact 3), a fixed contact plate 20, a movable contact plate 30, a movable shaft 73, and a holding member 713. A set of the contact portion 4 (fixed contact 2, movable contact 3), fixed contact plate 20, movable contact plate 30, movable shaft 73, and holding member 713 is provided side by side in the front-rear direction. When distinguishing each of the two sets of contact portions 4 (fixed contact 2 and movable contact 3), fixed contact plate 20, movable contact plate 30, movable shaft 73, and holding member 713, reference is made to the configuration of the front set. In the description, “a” is added to the end, and “b” is added to the end of the reference numerals for the configuration of the rear group.

  Further, in the contact device 1 of the present embodiment, the upper ends of the movable shaft 73a and the movable shaft 73b are connected by the first flange portion 731A in order to simultaneously close or open the two contact portions 4a and 4b. Yes.

  The arc extinguishing frame 5E of the present embodiment is configured to enclose both the two contact portions 4a and 4b, and has a flow path 50B formed along the front-rear direction. On the left side wall of the arc extinguishing frame 5E, a hole 51a for accommodating the contact portion 4a in the arc extinguishing frame 5E is formed, and a hole 51b for accommodating the contact portion 4b in the arc extinguishing frame 5E is formed. Further, the arc extinguishing frame 5E has a vent hole 52A on the rear surface and a vent hole 54A on the front surface.

  Moreover, the magnet 6B applies the magnetic field which goes to the left with respect to the space containing the contact parts 4a and 4b in the arc-extinguishing frame 5E.

  As described above, the contact device 1 according to the present embodiment includes the plurality of contact portions 4, and the plurality of contact portions 4 share the arc extinguishing frame 5 </ b> E, the magnet 6 </ b> B, and the like. Space saving can be realized and cost can be reduced as compared with the case where a plurality of contact devices 1 are used.

  Further, the arc extinguishing frame 5E has openings (the vent hole 52A and the vent hole 54A) on the front surface and the rear surface. Therefore, even if the current flowing directions are different from each other at the two contact portions 4, the air expanded by the heat of the arc is discharged through the vent holes 52A or 54A, and the arc is extinguished quickly. Can do.

  Further, the arc extinguishing frame 5E may be configured to have holes (intake / exhaust holes) on a surface between the plurality of contact portions 4 in the front-rear direction. As shown in FIG. 12, the arc-extinguishing frame 5F has an intake / exhaust hole 57 formed in the left side wall between the contact portion 4a and the contact portion 4b in the front-rear direction. By this intake / exhaust hole 57, it is possible to discharge the air to the outside of the arc extinguishing frame 5F or to suck the air into the arc extinguishing frame 5F more efficiently.

  For example, when a current flows from the movable contact 3a toward the fixed contact 2a and a current flows from the movable contact 3b toward the fixed contact 2b, the arcs generated at the contact portions 4a and 4b are both stretched backward. In this case, the air expanded mainly by the heat of the arc generated at the contact portion 4 a is discharged through the intake / exhaust hole 57 between the contact portions 4 a and 4 b. That is, the exhaust efficiency in the arc extinguishing frame 5F is improved by the intake / exhaust hole 57, the arc generated at the contact portion 4a is easily stretched, and the arc can be extinguished quickly.

  Further, when a current flows from the movable contact 3a toward the fixed contact 2a and a current flows from the fixed contact 2b toward the movable contact 3b, the arc generated at the contact portion 4a is stretched backward and generated at the contact portion 4b. The arc to be stretched forwards. In this case, the air expanded by the heat of the arc generated at the contact portions 4 a and 4 b is discharged through the intake and exhaust holes 57 between the contact portions 4 a and 4 b. That is, the exhaust efficiency in the arc extinguishing frame 5F is improved by the intake / exhaust hole 57, the arc generated at the contact portions 4a and 4b is easily stretched, and the arc can be extinguished quickly.

  Further, when a current flows from the fixed contact 2a toward the movable contact 3a and a current flows from the movable contact 3b toward the fixed contact 2b, the arc generated at the contact portion 4a is stretched forward and generated at the contact portion 4b. The arc to be stretched backwards. In this case, when an arc is generated in the contact portions 4a and 4b and air is discharged through the vent holes 52A and 54A, air is sucked into the arc extinguishing frame 5F through the intake and exhaust holes 57. That is, the air supply efficiency into the arc extinguishing frame 5F is improved by the intake / exhaust holes 57, the arc generated at the contact portions 4a and 4b is easily stretched, and the arc can be extinguished quickly.

  The contact device 1 may be configured such that the two contact portions 4a and 4b are connected in series. As shown in FIG. 13, the contact portions 4 a and 4 b are connected in series by short-circuiting the terminal portion 22 a of the fixed contact plate 20 a and the terminal portion 32 b of the movable contact plate 30 b using the conductive member 74. The conductive member 74 is provided so as to be exposed from the side plate 712, but may be configured to be insert-molded on the side plate 712.

  By connecting the two contact portions 4a and 4b in series, the voltage applied between the fixed contact 2 and the movable contact 3 at the time of opening is divided as compared with a configuration including a set of contact portions 4. Therefore, the breakdown voltage of the contact device 1 can be improved.

  Further, by configuring as described above, a plurality (two) of the contact portions 4a and 4b have a force (Lorentz force) acting on a current flowing between the fixed contact 2 and the movable contact 3 by an applied magnetic field. The direction is the same. That is, since the contact portions 4a and 4b have the same current flowing direction, the arcs generated at the contact portions 4a and 4b can be extended in the same direction. Therefore, the air expanded by the heat of the arc generated at the contact portions 4a and 4b is discharged through one of the vent holes 52A and 54A, and the air enters the arc extinguishing frame 5E through the other of the vent holes 52A and 54A. Is inhaled. As a result, the direction of the air flowing through the flow path 50B of the arc extinguishing frame 5E is only one direction, and intake and exhaust can be performed efficiently, so that the arc can be more easily stretched and the arc can be extinguished more quickly. it can. Moreover, since the arc generated at the contact portion 4a and the contact portion 4b is stretched in the same direction, it is possible to prevent the arcs from contacting each other.

  Further, the contact device 1 may be configured such that the two contact portions 4a and 4b are connected in parallel. By short-circuiting the terminal portion 22a of the fixed contact plate 20a and the terminal portion 22b of the fixed contact plate 20b, and further short-circuiting the terminal portion 32a of the movable contact plate 30a and the terminal portion 32b of the movable contact plate 30b, the contact portion 4a. , 4b are connected in parallel.

  By connecting the two contact portions 4a and 4b in parallel, the current flowing between the fixed contact 2 and the movable contact 3 at the time of closing is divided as compared with the configuration including one set of contact portions 4. The current capacity of the contact device 1 can be improved.

  Furthermore, since the current flowing directions are the same in the contact portion 4a and the contact portion 4b, arcs generated in the contact portions 4a and 4b can be stretched in the same direction. Therefore, it becomes easier to stretch the arc, and the arc can be extinguished more quickly. Moreover, it can also prevent that arcs contact.

  In the above configuration, a magnetic field in the same direction is applied to the contact portions 4a and 4b using one magnet 6B, but a magnetic field is applied to each of the contact portions 4a and 4b using two magnets. You may comprise. Thereby, since it can comprise so that the direction of the magnetic field applied to each contact part 4a, 4b may mutually differ, even if it is a case where the direction of an electric current differs in the contact part 4a and the contact part 4b, a contact point The arc generated in the parts 4a and 4b can be stretched in the same direction.

  Further, when the direction of the current flowing between the fixed contact 2 and the movable contact 3 is defined in a specific direction, the direction in which the arc is stretched is also specified, so that part of the arc extinguishing frame 5E can be omitted. For example, when the direction of the current is defined in the direction from the movable contact 3 to the fixed contact 2, the arc is stretched backward. In this case, since no arc exists on the front side of the contact portion 4a, an arc extinguishing frame 5G having an asymmetric shape in the front-rear direction can be used as shown in FIG. The arc extinguishing frame 5G has a side wall on the front side of the contact portion 4b omitted, and is formed such that the hole 51a through which the fixed contact plate 20a and the movable contact plate 30a pass and the vent hole 54A are continuous. Therefore, the arc-extinguishing frame 5G can be made shorter in the front-rear direction than the arc-extinguishing frame 5E. Moreover, the dimension in the front-back direction of the magnet 6C can also be shortened compared with the magnet 6B. Therefore, the material constituting the arc extinguishing frame 5G and the magnet 6C can be reduced, and the cost can be reduced. Furthermore, the size of the contact device 1 can be reduced, specifically, the width in the front-rear direction can be shortened to reduce the thickness.

  Note that the contact device 1 is not limited to the number of the contact portions 4 but may be configured to include more contact portions 4. As shown in FIGS. 15 and 16, the contact device 1 includes three contact portions 4. The contact device 1 includes an arc extinguishing frame 5H configured to surround the three contact portions 4, and a magnet 6D for applying a magnetic field in the arc extinguishing frame 5H. The terminal portion 22 of the front fixed contact plate 20 and the terminal portion 32 of the central movable contact plate 30 are short-circuited by the conductive member 74A, and the terminal portion 22 of the central fixed contact plate 20 and the rear movable contact plate 30 are connected. The terminal portion 32 is short-circuited with the conductive member 74B. Accordingly, since the three contact portions 4 are connected in series, the arc generated at each contact portion 4 is stretched in the same direction. Since the arc extinguishing frame 5 has openings (the vent hole 52B and the vent hole 54B) on the front surface and the rear surface, regardless of the direction of the current flowing between the fixed contact 2 and the movable contact 3, the arc Can be extinguished quickly.

  The shape of the arc extinguishing frame 5E is not limited to a rectangular parallelepiped shape, and may be any shape that forms a flow path that communicates with at least one side in the front-rear direction with respect to the space including the contact portion 4. For example, as shown in FIGS. 17 to 19, the arc extinguishing frame 5J is formed in an S shape in which a space between the contact portion 4a and the contact portion 4b is curved, and a space including the contact portion 4a and the contact portion. The space including 4b is continuous. FIG. 19 is a cross-sectional view taken along the line CC in FIG.

  Further, the contact device 1 of the present modification includes two magnets 61 and 62, the magnet 61 applies a magnetic field to a space including the contact portion 4a, and the magnet 62 includes a space including the contact portion 4b. Apply a magnetic field to By providing the two magnets 61 and 62, the arc can be extended in different directions even if the current flowing directions are the same in the contact portion 4a and the contact portion 4b. Thereby, the arc generated at the contact portion 4a can be extended forward, and the arc generated at the contact portion 4b can be extended backward. Therefore, the air in the arc extinguishing frame 5J can be efficiently discharged through the vent holes 52C and 54C, and the arc can be extinguished quickly.

  Moreover, as shown in FIG. 20, you may use the arc-extinguishing frame 5K in which the hole 58 was formed between the contact part 4a and the contact part 4b. The arc extinguishing frame 5K includes the holes 58, so that the air can be discharged out of the arc extinguishing frame 5K or the air can be sucked into the arc extinguishing frame 5K more efficiently.

  Moreover, you may be comprised so that the position of the contact parts 4a and 4b in the left-right direction may mutually differ. As shown in FIGS. 21 to 23, the fixed contact plate 20b and the movable contact plate 30b are formed longer than the fixed contact plate 20a and the movable contact plate 30a, and the contact portion 4b is positioned on the right side of the contact portion 4a. doing. FIG. 23 is a cross-sectional view taken along the line DD in FIG. The arc extinguishing frame 5L is formed so as to surround both the contact portions 4a and 4b, and includes an inclined portion 59 that continues the space including the contact portion 4a and the space including the contact portion 4b. . In addition, the contact device 1 of the present modification includes two magnets 61A and 62A. The magnet 61A applies a magnetic field to a space including the contact portion 4a, and the magnet 62B includes a space including the contact portion 4b. Apply a magnetic field to By providing the two magnets 61A and 62A, the arc can be extended in different directions even if the current flowing directions are the same in the contact portion 4a and the contact portion 4b. Thereby, the arc generated at the contact portion 4a can be extended forward, and the arc generated at the contact portion 4b can be extended backward. Therefore, the air in the arc extinguishing frame 5L can be efficiently discharged through the vent holes 52D and 54D, and the arc can be extinguished quickly.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made according to design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it can be changed.

DESCRIPTION OF SYMBOLS 1 Contact apparatus 2 Fixed contact 3 Movable contact 4 Contact part 5 Arc-extinguishing frame 50 Flow path 52 Vent 6 Magnet

Claims (8)

A contact portion having a fixed contact and a movable contact that moves between a closed position in contact with the fixed contact and an open position away from the fixed contact;
A magnet for generating a magnetic field,
The direction that intersects both the direction of the magnetic field applied to the contact portion and the direction in which the movable contact moves is an action direction,
An arc extinguishing frame that forms a flow path that leads to at least one side of the working direction with respect to the space including the contact portion;
The arc-extinguishing frame has a vent hole on at least one surface of the surface facing the contact portion in the direction of action with respect to the contact portion. The contact device according to claim 1, wherein the arc extinguishing frame is configured to surround the contact portion. The contact device according to claim 2, wherein the arc extinguishing frame has an intake hole on a surface of the arcing frame opposite to the vent hole with respect to the contact portion in the action direction. The contact device according to claim 2, wherein the vent hole is provided on both surfaces of the arc extinguishing frame with respect to the contact portion in the action direction. The contact device according to any one of claims 2 to 4, comprising a plurality of the contact portions. The contact device according to claim 5, wherein the plurality of contact portions have the same direction of force acting on a current flowing between the fixed contact and the movable contact by the applied magnetic field. . The contact device according to claim 5 or 6, wherein the arc extinguishing frame has an intake / exhaust hole on a surface between the plurality of contact portions in the operation direction. The contact device according to any one of claims 1 to 7, wherein the arc extinguishing frame has an asymmetric shape in the action direction.

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