JP2012199127A - Contact device and electromagnetic relay using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device which reduces noise generated when a fixed contact and a movable contactor come into contact with each other and is inexpensive.SOLUTION: The contact device includes: a first fixed contact and a second fixed contact which are disposed in alignment with each other; and a movable contactor movable between a first position where the first fixed contact and the second fixed contact come into contact with each other and are electrically connected to each other and a second position where the first fixed contact and the second fixed contact are separated from each other. When the movable contactor is located at the first position, the first fixed contact and the second fixed contact have together a support part which comes into contact with the movable contactor to support it and has electrical insulation.

Description

  The present invention relates to a contact device and an electromagnetic relay using the contact device.

  Patent Document 1 discloses a conventional electromagnetic relay. A conventional electromagnetic relay includes a contact device and an electromagnet device. The contact device includes a first fixed contact, a second fixed contact, a third fixed contact, and a movable contact. Each fixed contact is connected to a terminal block configured to receive an electric current from the outside. The movable contact is at a first position where it contacts each of the first fixed contact, the second fixed contact, and the third fixed contact, and at a position opposed to each of the first fixed contact, the second fixed contact, and the third fixed contact. It is configured to be movable between a second position that is spaced so as to be positioned. The electromagnet device moves the movable contact between the first position and the second position. When the electromagnet device moves the movable contact to the first position, the first fixed contact, the second fixed contact, and the third fixed contact are electrically connected by the movable contact, whereby the first fixed contact Current flows between the first fixed contact and the second fixed contact, and a current flows between the first fixed contact and the third fixed contact. On the other hand, when the electromagnet device moves the movable contact to the second position, the movable contact is separated from each fixed contact, whereby the first fixed contact is electrically connected to the second fixed contact and the third fixed contact. Insulated. In this way, the electromagnet device controls the current flowing between the fixed contacts.

  The electromagnetic relay has a first fixed contact, a second fixed contact, and a third fixed contact that come into contact with the movable contact located at the first position. Therefore, the movable contact located at the first position is supported by the first fixed contact, the second fixed contact, and the third fixed contact. That is, the movable contact is stably supported at three locations. When the movable contact moves from the second position to the first position, the movable contact comes into contact with the first fixed contact, the second fixed contact, and the third fixed contact.

  When the electromagnetic relay has only two fixed contacts, vibration occurs when the two fixed contacts come into contact with the movable contact. However, the electromagnetic relay described in Patent Document 1 has a fixed contact composed of three first fixed contacts, a second fixed contact, and a third fixed contact. Therefore, the movable contactor is stably supported by the three of the first fixed contact, the second fixed contact, and the third fixed contact. Therefore, the vibration which arises when two fixed contacts and a movable contact contact | abut is suppressed. In this way, the electromagnetic relay is suppressed from generating noise.

JP 2010-257923 A

  By the way, the 1st fixed contact, the 2nd fixed contact, and the 3rd fixed contact with which the contact device of patent documents 1 is provided are formed with the material which has conductivity, respectively. For example, the first fixed contact, the second fixed contact, and the third fixed contact are each formed of a conductive metal. When three fixed contacts made of metal are used to stably support the movable contact at three locations, the cost of the contact device and the electromagnetic relay increases.

  The present invention has been made to solve the above problems. The subject of this invention is reducing the noise which arises in the state which the fixed contact and the movable contact contacted, and providing the electromagnetic relay provided with the low-cost contact device and the low-cost contact device.

  In order to solve the above-described problems, the contact device of the present invention is in contact with and electrically connected to the first fixed contact and the second fixed contact arranged side by side, and the first fixed contact and the second fixed contact. A movable contact that is movable between a first position and a second position spaced apart from the first fixed contact and the second fixed contact; When the movable contact is in the first position, the first contact and the second fixed contact together with the first contact and supporting the movable contact are supported.

  The electromagnetic relay including the contact device preferably further includes an electromagnet device that moves the movable contact between the first position and the second position.

  It is preferable that the support portion is disposed on a perpendicular bisector connecting a line connecting the first fixed contact and the second fixed contact.

  The electromagnet device includes a shaft that transmits a force for moving the movable contact to the movable contact, and the force for moving the movable contact includes the first fixed contact, the second fixed contact, and the support portion. It is preferable to act on the portion corresponding to the centroid of the polygon whose vertex is defined by.

  The number of the support portions is preferably one or more.

  From another point of view, the contact device according to the present invention is electrically connected to the first fixed contact and the second fixed contact, the first fixed contact, and the second fixed contact arranged side by side. A movable contact that is movable between a first position to be connected and a second position that is separated from the first fixed contact and the second fixed contact, and the movable contact is in the first position; And a support part that contacts and supports the movable contact together with the first fixed contact and the second fixed contact, and the support part is a line segment connecting the first fixed contact and the second fixed contact. Are arranged on the vertical bisector.

  From another point of view, the electromagnetic relay of the present invention is electrically connected to the first fixed contact and the second fixed contact, the first fixed contact, and the second fixed contact arranged side by side. And a movable contact movable between the first fixed contact and the second position spaced apart from the second fixed contact, the movable contact being in the first position A contact device having a support portion that contacts and supports the movable contact together with the first fixed contact and the second fixed contact, and moves the movable contact between the first position and the second position. An electromagnet device. The electromagnet device has a shaft that transmits a force for moving the movable contact to the movable contact. The force that moves the movable contact acts on a portion corresponding to a polygonal centroid whose apex is defined by the first fixed contact, the second fixed contact, and the support portion.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration which arises in the state which the fixed contact and movable contact are contacting can be suppressed, and an inexpensive contact device can be provided.

Side surface sectional drawing of the electromagnetic relay of embodiment. The disassembled perspective view of a part of electromagnet apparatus employ | adopted as the electromagnetic relay of embodiment. The schematic showing the relationship between a movable contact same as the above, a 1st fixed contact, a 2nd fixed contact, and a support part. The top view of the movable contact in the change aspect same as the above. Schematic showing the relationship between the movable contact in a change aspect same as the above, a 1st fixed contact, a 2nd fixed contact, and a support part. Schematic showing the relationship between the movable contact in a change aspect same as the above, a 1st fixed contact, a 2nd fixed contact, and a support part.

  FIG. 1 shows a side cross-sectional view of an electromagnetic relay. Here, in FIG. 1, the X direction is defined as above the electromagnetic relay, and the Y direction is defined as the left side of the electromagnetic relay. In addition, the up-down direction, the left-right direction, and the front-back direction of the electromagnetic relay are used for explanation of the electromagnetic relay. Therefore, the vertical direction, left-right direction, and front-rear direction in the description do not limit the vertical direction, left-right direction, and front-rear direction of the electromagnetic relay. As shown in FIG. 1, the electromagnetic relay includes an electromagnet device 1 and a contact device 2.

  The electromagnet device 1 includes a fixed member and a movable member disposed so as to face the fixed member. The fixing member includes a winding 3, a coil bobbin 4, a yoke 5, and a fixed iron core 6. The movable member has a movable iron core 7 and a shaft 26.

  The coil bobbin 4 is made of a synthetic resin and is formed in a cylindrical shape, thereby having an axial hole along the axial direction. The coil bobbin 4 has a winding 3 wound around it. The yoke 5 is made of a magnetic metal material, and is formed so as to surround the coil bobbin 4. The fixed iron core 6 is formed in a columnar shape, and a flange portion 32 is provided at the upper end thereof. The movable iron core 7 is formed in a columnar shape. The fixed iron core 6 and the movable iron core 7 are arranged side by side in the axial direction of the coil bobbin 4 within the shaft hole of the coil bobbin 4. The fixed iron core 6 cooperates with the movable iron core 7 and the yoke 5 to form a magnetic path through which the magnetic flux generated when the winding 3 receives current is passed. The fixed iron core 6 is provided with an insertion hole 61 along the vertical direction. The fixed iron core 6 is provided with a housing recess 16 on the lower surface thereof.

  The yoke 5 includes a yoke upper plate 9, a yoke lower plate 10, and a yoke side plate 11. As shown in FIG. 2, the yoke upper plate 9 is formed in a rectangular plate shape. As shown in FIG. 1, the yoke upper plate 9 is disposed so as to contact the upper end of the coil bobbin 4. The yoke lower plate 10 is formed in a rectangular plate shape and is disposed so as to contact the lower end of the coil bobbin 4. The yoke side plate 11 is disposed between the yoke upper plate 9 and the yoke lower plate 10 so as to connect the yoke lower plate 10 and the yoke upper plate 9. The yoke lower plate 10 and the yoke side plate 11 are formed by bending a single plate. Thereby, the yoke lower plate 10 and the yoke side plate 11 are integrally formed.

  The coil bobbin 4 houses a plunger cap 12 inside thereof. The plunger cap 12 has an axial direction along the vertical direction. The plunger cap 12 is formed in a cylindrical shape, and a bottom is provided at the lower end. And the rubber sheet 17 is arrange | positioned at the bottom of the plunger cap 12, and it is formed in the cylindrical shape so that the fixed iron core 6 and the movable iron core 7 can be arrange | positioned inside. The fixed iron core 6 is fixedly disposed in the plunger cap 12 so as to close the upper end of the plunger cap 12, and accordingly, a storage space is provided between the bottom of the plunger cap 12 and the lower surface of the fixed iron core 6. Is formed. The movable iron core 7 is disposed in the storage space of the plunger cap 12 so as to be movable along the axial direction of the plunger cap 12. Thereby, the movable iron core 7 is configured to be movable between the initial position and the contact position in the storage space of the plunger cap 12. When the movable iron core 7 is positioned at the initial position, the movable iron core 7 is separated from the fixed iron core 6 and comes into contact with a rubber sheet 17 provided on the bottom of the plunger cap 12. When the movable iron core 7 is located at the contact position, the movable iron core 7 is separated from the bottom of the plunger cap 12 and abuts against the fixed iron core 6. The plunger cap 12 further houses a spring 13 inside thereof. The spring 13 is disposed between the fixed iron core 6 and the movable iron core 7, and generates a spring bias that separates the movable iron core 7 from the fixed iron core 6. More specifically, the upper end of the spring 13 is disposed in the housing recess of the fixed iron core 6. The lower end of the spring 13 is in contact with the upper end of the movable iron core 7. Thereby, the spring 13 moves the movable iron core 7 away from the fixed iron core 6 and positions it at the initial position.

  FIG. 2 is an exploded perspective view of the electromagnet device 1. In FIG. 2, the coil bobbin 4, the yoke side plate 11, and the yoke lower plate 10 are omitted. As shown in FIG. 2, the yoke upper plate 9 is provided with an insertion hole 14 at the center thereof. The insertion hole 14 is formed so as to penetrate along the vertical direction of the electromagnetic relay. A rubber sheet 34 is disposed on the upper surface of the yoke upper plate 9. The rubber sheet 34 is provided with a through hole 36 along the vertical direction. The through hole 36 is arranged on the yoke upper plate 9 so as to communicate with the insertion hole 14 of the yoke upper plate 9. The fixed iron core 6 is fixed to the yoke upper plate 9 so that the lower end thereof is inserted into the insertion hole 14 and the through hole 36. The rubber sheet 34 is interposed between the yoke upper plate 9 and the flange portion 32 of the fixed iron core 6.

  The plunger cap 12 is fixed to the lower surface of the yoke upper plate 9 so that the opening communicates with the insertion hole 14 of the yoke upper plate 9. Further, as shown in FIG. 1, the lower end portion of the plunger cap 12 is inserted into a holding hole 15 provided in the central portion of the yoke lower plate 10, thereby moving the movable portion housed in the lower portion of the plunger cap 12. The iron core 7 is magnetically coupled to the yoke lower plate 10.

  As shown in FIGS. 1 and 2, a rubber sheet 33 is disposed on the upper surface of the flange portion 32 of the fixed iron core 6. And the cap 28 is arrange | positioned on the upper surface of the yoke upper board 9 so that the collar part 32 and the rubber sheet 33 of the fixed iron core 6 may be covered. The rubber sheet 33 and the cap 28 have a through hole 35 and a through hole 30 formed in the center thereof. The cap 28 is disposed on the upper surface of the yoke upper plate 9 so that the through hole 30 of the cap 28 is aligned with the insertion hole 61 of the fixed iron core 6 in the axial direction of the fixed iron core 6. Thereby, the insertion hole 30 of the cap 28 is communicated with the insertion hole 14 of the yoke upper plate 9.

  The shaft 26 is formed in a rod shape, and a flange 261 is provided at the upper end. The flange 261 of the shaft 26 functions as a stopper for the movable contact 25 described later. As shown in FIG. 1, the shaft 26 is inserted through the insertion hole 61 of the fixed iron core 6, and the lower part is fixed to the movable iron core 7. Thereby, when the movable iron core 7 moves upward, the shaft 26 moves upward, and when the movable iron core 7 moves downward, the shaft 26 moves downward. That is, the shaft 26 is configured to be movable in the vertical direction with respect to the fixed iron core 6.

  A spring 29 is disposed between the movable contact 25 and the cap 28. The spring 29 is formed in a coil shape so that the shaft 26 is inserted through the spring 29. The spring 29 is arranged to give a spring bias to the movable contact 25.

  With the above configuration, when a current flows through the winding 3, a magnetic field is formed around the winding 3. By forming a magnetic field around the winding 3, the movable iron core 7 disposed around the magnetic field is moved in the direction of decreasing the magnetic resistance. That is, when a magnetic field is formed around the winding 3, the movable iron core 7 disposed around the magnetic field moves toward the fixed iron core 6 so as to reduce the magnetic resistance. Accordingly, the movable iron core 7 is thereby moved from the initial position to the contact position. Since a part of the spring 13 is inserted into the storage recess 16 formed in the fixed iron core 6, when the movable iron core 7 moves to the contact position, the spring 13 is compressed and the entire spring 13 is stored in the storage recess. 16. Thereby, the spring 13 does not disturb the contact between the fixed iron core 6 and the movable iron core 7. Further, since the rubber sheet 19 is disposed on the upper surface of the movable iron core 7, it is generated between the movable iron core 7 and the fixed iron core 6 when the movable iron core 7 and the fixed iron core 6 come into contact with each other. The shock is eased. Further, as the movable iron core 7 moves from the initial position to the contact position, the shaft 26 whose lower end is fixed to the movable iron core 7 also moves upward. On the other hand, when no current flows through the winding 3, no magnetic field is formed around the winding 3. Therefore, the movable iron core 7 is moved from the contact position to the initial position by the spring bias generated by the spring 13.

  As shown in FIG. 1, a base block 20 is disposed above the electromagnet device 1. The base block 20 is made of a ceramic that is a heat resistant material. The electromagnet device 1 and the base block 20 are connected by a connecting body 31. The base block 20 has an open bottom surface. The base block 20 is provided with two terminal holes 21. A fixed terminal block 22 is inserted into each terminal hole 21. A first fixed contact 231 and a second fixed contact 232 having conductivity are provided on the lower end surface of each fixed terminal block 22 so as to be arranged side by side. Each fixed terminal block 22 is brazed to the base block 20. By disposing the base block 20 above the electromagnet device 1, the inside of the base block 20 is hermetically sealed. The base block is filled with hydrogen gas.

  A support body 221 that protrudes downward is further provided on the inner lower surface of the base block 20. The support 221 is made of the same material as the base block 20. The support body 221 is located at a position shifted from the line connecting the fixed terminal blocks 22. In other words, the support 221 is not aligned with the fixed terminal block 22. The support body 221 is provided with a support portion 233 made of a resin having electrical insulation on the lower surface. Therefore, the support portion 233 is arranged so as to be shifted from a line connecting the first fixed contact 231 and the second fixed contact 232. In other words, the support portion 233 is not aligned with the first fixed contact 231 and the second fixed contact 232. The support portion 233 is positioned on a vertical bisector L50 of a line connecting the first fixed contact 231 and the second fixed contact 232. In other words, the support portion 233 is arranged so that the distance between the support portion 233 and the first fixed contact 231 is equal to the distance between the support portion 233 and the second fixed contact 232. In addition, the support portion 233 is disposed on the lower surface of the support body 221 so as to be positioned at the same height as the first fixed contact 231 and the second fixed contact 232. More specifically, the lower end of the support portion 233 is positioned at the same height as the lower ends of the first fixed contact 231 and the second fixed contact 232.

  That is, the first fixed contact 231, the second fixed contact 232, and the support part 233 are arranged along a plane parallel to the upper surface of the movable contact 25.

  As shown in FIG. 3, the movable contact 25 is formed in a plate shape, and extends rearward from the main plate portion 254 having a length along the left-right direction and the center in the length direction of the main plate portion 254. And an auxiliary plate portion 255. Therefore, the auxiliary plate portion 255 extends along the vertical bisector L51 that connects the both ends of the main plate portion 254. The movable contact 25 has conductivity. The movable contact 25 has an upper surface that faces the first fixed contact 231, the second fixed contact 232, and the support portion 233. The movable contact 25 has a movable contact on its upper surface. The movable contacts are provided at both ends of the main plate portion 254 in the length direction. The movable contacts are arranged at positions facing the first fixed contact 231 and the second fixed contact 232, respectively. Therefore, the movable contact that contacts the first fixed contact 231 in the situation where the movable contact 25 is located at the first position is defined as the first movable contact 251. A movable contact that contacts the second fixed contact 232 in a situation where the movable contact 25 is located at the first position is defined as a second movable contact 252.

  The auxiliary plate portion 255 is provided with a contact portion 253 at the rear end thereof. Therefore, the contact portion 253 is located on the vertical bisector L50 of the line segment connecting the first fixed contact 231 and the second fixed contact 232. The contact portion 253 contacts the support portion 233 when the movable contact 25 is located at the first position.

  The movable contact 25 is provided with a shaft hole 27 at the center in the length direction of the main plate portion 254. The shaft hole 27 is provided so as to penetrate in the thickness direction along the vertical direction of the movable contact 25. The size of the shaft hole 27 is smaller than the flange 261 at the upper end of the shaft 26. The shaft 26 is inserted into the shaft hole 27 so that the flange 261 of the shaft 26 is located above the upper surface of the movable contact 25. Accordingly, the movable contact 25 is configured to be movable up and down along the axial direction of the shaft 26, and the first position where the movable contact 25 contacts the first fixed contact 231 and the second fixed contact 232, and the first fixed contact 231. And it is comprised so that a movement between the 2nd fixed contact 232 and the 2nd position spaced apart is possible. When the movable contact 25 is located at the first position, the movable contact 25 electrically connects the first fixed contact 231 and the second fixed contact 232. On the other hand, as can be seen from FIG. 1, when the movable contact 25 is located at the second position, the movable contact 25 is separated from the first fixed contact 231 and the second fixed contact 232, thereby the first fixed contact. 231 is electrically separated from the second fixed contact 232.

  When the movable iron core 7 is located at the initial position, the movable contact 25 is located at the second position by the flange 261 of the shaft 26 and the spring 29. Accordingly, the movable contact 25 is separated from the first fixed contact 231 and the second fixed contact 232, and the contact device 2 is opened.

  On the other hand, when the movable iron core 7 is located at the contact position, the movable contact 25 is moved by the spring 29 from the second position toward the first position. As a result, the movable contact 25 comes into contact with the first fixed contact 231, the second fixed contact 232, and the support portion 233. More specifically, as a result, the movable contact 25 is kept in contact with the first fixed contact 231, the second fixed contact 232, and the support portion 233. As a result, the first fixed contact 231 and the second fixed contact 232 are electrically connected by the movable contact 25. Further, the support portion 233 comes into contact with the movable contact 25. In other words, the support part 233 is kept in contact with the movable contact 25.

  In short, the contact device 2 is opened during a period when the winding 3 is not energized, and the fixed terminal block 22 is thereby insulated. Further, during a period in which the winding 3 is energized, the first fixed contact 231 and the second fixed contact 232 are electrically connected by the movable contact 25, and thereby the fixed terminal block 22 is electrically connected. The contact pressure between the movable contact and the fixed contact is ensured by the spring 29.

  Such an electromagnetic relay operates as follows. In a situation where no current flows through the winding 3, the movable iron core 7 is positioned at an initial position separated from the fixed iron core 6 by the spring 13. On the other hand, the movable contact 25 is positioned at the second position by the flange 261 of the shaft 26 and the spring 29 positioned between the lower surface of the movable contact 25 and the cap 28. When a current flows through the winding 3, the winding 3 generates a magnetic field. The movable iron core 7 is moved toward the fixed iron core 6 so as to lower the magnetic resistance in the space where the magnetic field is generated. In this way, the movable iron core 7 moves from the initial position to the contact position. As the movable iron core 7 moves from the initial position to the contact position, the shaft 26 to which the movable iron core 7 is attached also moves upward. When the shaft 26 moves upward, the spring 29 disposed between the movable contact 25 and the cap 28 applies a spring bias to the movable contact 25. The movable contact 25 is moved from the second position to the first position along the axial direction of the shaft 26 by a spring bias. In this way, the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232. In the situation where the movable contact 25 is located at the first position, when a current is supplied to one fixed terminal base 22, the other contact is made via the first fixed contact 231, the movable contact 25, and the second fixed contact 232. A current flows through the fixed terminal block 22.

  Here, when the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232, the movable contact 25 also comes into contact with the support portion 233. More specifically, the first fixed contact 231, the second fixed contact 232, and the contact portion 233 are arranged along a plane parallel to the upper surface of the movable contact 25. Accordingly, at the moment when the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232, the movable contact 25 also comes into contact with the support portion 233.

  As a result, the movable contact 25 is supported at three locations: the first fixed contact 231, the second fixed contact 232, and the support portion 233. As a result, the impact generated when the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232 is dispersed by the first fixed contact 231, the second fixed contact 232, and the support portion 233 to suppress vibration. can do. As a result, noise caused by vibration can be reduced. The support portion 233 is made of a resin having electrical insulation. Therefore, noise caused by vibration can be reduced at a lower cost than an electromagnetic relay having three fixed contacts made of metal.

  In the electromagnetic relay shown in FIG. 1, the support portion 233 is made of a resin having electrical insulation. However, the material of the support part 233 is not limited to resin. The support portion 233 or a protrusion made of an electrically insulating ceramic may be used.

  When no current is supplied to the winding 3, the winding 3 does not generate a magnetic field. Therefore, the movable iron core 7 is moved from the contact position to the initial position by the spring 13 and is separated from the fixed iron core 6. As the movable iron core 7 moves to the initial position, the shaft 26 is also moved downward along the axial direction of the shaft 26. As the shaft 26 moves downward, the shaft 26 applies a downward force to the periphery of the shaft hole 27 of the movable contact 25. More specifically, as the shaft 26 moves downward, the flange 261 of the shaft 26 applies a force for moving the movable contact 25 to the periphery of the shaft hole 27 of the movable contact 25. As a result, the movable contact 25 is moved from the first position to the second position. As a result, the first fixed contact 231 is electrically insulated from the second fixed contact 232.

  Further, when the first fixed contact 231 is separated from the movable contact 25, an arc is generated between the first fixed contact 231 and the first movable contact 251. Similarly, when the second fixed contact 232 is separated from the movable contact 25, an arc is generated between the second fixed contact 232 and the second movable contact 252. This arc is cooled by hydrogen gas. As a result, the arc is quickly erased.

  As described above, the contact device 2 of the present invention includes the first fixed contact 231, the second fixed contact 232, and the movable contact 25. The first fixed contact 231 is arranged side by side with the second fixed contact 232. The movable contact 25 is configured to be movable between a first position and a second position. When the movable contact 25 is located at the first position, the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232, and electrically connects the first fixed contact 231 and the second fixed contact 232. Connect to. When the movable contact 25 is located at the second position, the movable contact 25 is separated from the first fixed contact 231 and the second fixed contact 232. As a result, the first fixed contact 231 is electrically insulated from the second fixed contact 232. The contact device 2 further includes a support portion 233 having electrical insulation. When the movable contact 25 is positioned at the first position, the support portion 233 contacts the movable contact 25 together with the first fixed contact 231 and the second fixed contact 232. Accordingly, the support portion 233 supports the movable contact 25 together with the first fixed contact 231 and the second fixed contact 232.

  Therefore, noise generated when the first fixed contact 231 and the second fixed contact 232 come into contact with the movable contact 25 can be reduced, and the cost of the contact device 2 can be reduced.

  Moreover, the support part 233 which supports the movable contact 25 has electrical insulation. In addition, no current flows through the support portion 233. Therefore, it is not necessary to connect the support portion 233 to the fixed terminal block. That is, there is no need to provide an unnecessary fixed terminal block, and the space around the first fixed contact 231 and the second fixed contact 232 can be saved.

  Further, in the contact device 2 of the present invention, the movable contact 25 has a first surface (upper surface in FIG. 1) that faces the first fixed contact 231, the second fixed contact 232, and the support portion 233. The first fixed contact 231, the second fixed contact 232, and the support part 233 are arranged along a plane parallel to the first surface.

  Thereby, when the movable contact 25 moves from the second position to the first position, the movable contact 25 can be simultaneously brought into contact with the first fixed contact 231, the second fixed contact 232, and the support portion 233. The movable contact 25 continues to contact the first fixed contact 231, the second fixed contact 232, and the support portion 233. That is, the movable contact 25 is continuously supported by the first fixed contact 231, the second fixed contact 232, and the support portion 233. Therefore, noise generated when the movable contact 25, the first fixed contact 231, the second fixed contact 232, and the movable contact 25 are in contact with each other can be reduced.

  As shown in FIG. 1, the electromagnetic relay includes a contact device 2 and an electromagnet device 1. The electromagnet device 1 is configured to move the movable contact 25 between a first position and a second position.

  Therefore, an electromagnetic relay can be obtained at a lower cost than an electromagnetic relay having three fixed contacts made of metal.

  Further, when the first fixed contact 231 and the second fixed contact 232 are in contact with the movable contact 25, vibration is generated between the movable contact 25 and the first fixed contact 231 and the second fixed contact 232.

  However, the support portion 233 is disposed on the vertical bisector L50 that connects the first fixed contact 231 and the second fixed contact 232. In other words, the support portion 233 is disposed so that the distance between the first fixed contact 231 and the support portion 233 is equal to the distance between the second fixed contact 232 and the support portion 233. Therefore, the support portion 233 does not make the vibration generated between the movable contact 25 and the first fixed contact 231 and the second fixed contact 232 uneven. That is, it is possible to support the movable contact 25 at three locations while making the pressure when the movable contact 25 contacts the first fixed contact 231 and the second fixed contact 232 uniform.

  Further, the support portion 233 is arranged so as to be shifted from a line connecting the first fixed contact 231 and the second fixed contact 232. In other words, the support portion 233 is not arranged in a straight line with the first fixed contact 231 and the second fixed contact 232. In other words, the support part 233, the first fixed contact 231 and the second fixed contact 232 form a polygon having the support part 233, the first fixed contact 231 and the second fixed contact 232 as vertices. It is arranged.

  Specifically, the movable contact 25 has a main plate portion 254 and an auxiliary plate portion 255. The main plate portion 254 has a length along a first direction (left-right direction in FIG. 1) in which the first fixed contact 231 and the second fixed contact 232 are arranged. The auxiliary plate portion 255 extends from the center in the length direction of the main plate portion 254 along a second direction (backward in FIG. 1) that intersects the first direction. The first fixed contact 231 and the second fixed contact 232 are arranged such that the first fixed contact 231 and the second fixed contact 232 are in contact with the main plate portion 254 of the movable contact 25 when the movable contact 25 is located at the first position. Is arranged. And the support part 233 is arrange | positioned so that the support part 233 may contact the auxiliary | assistant board part 255, when the movable contactor 25 is located in a 1st position.

  With this configuration, the movable contact 25 is supported at three points by the first fixed contact 231, the second fixed contact 232, and the support portion 233. Therefore, the movable contact 25 is stably supported by the first fixed contact 231, the second fixed contact 232, and the support portion 233.

  As shown in FIG. 2, the movable contact 25 includes a main plate portion 254 and an auxiliary plate portion 255 that extends rearward from the center in the left-right direction of the main plate portion 254. However, the shape of the movable contact 25 is not limited to the shape of the movable contact 25 shown in FIG. A movable contact 25 having an auxiliary plate portion 255 extending from a portion other than the center of the main plate portion 254 in the first direction toward a second direction intersecting with the first direction may be employed.

  For example, in the movable contact 25 as shown in FIG. 6, the main plate portion 254 has a length along the first direction in which the first fixed contact 231 and the second fixed contact 232 are arranged. The auxiliary plate portion 255 extends from the main plate portion 254 in a second direction that intersects the first direction. The first fixed contact 231 and the second fixed contact 232 are arranged such that the first fixed contact 231 and the second fixed contact 232 are in contact with the main plate portion 254 of the movable contact 25 when the movable contact 25 is located at the first position. Is arranged. And the support part 233 is arrange | positioned so that the support part 233 may contact the auxiliary | assistant board part 255, when the movable contactor 25 is located in a 1st position. Even when such a movable contact 25 is used, the movable contact 25 is supported at three points by the first fixed contact 231, the second fixed contact 232, and the support portion 233. Therefore, the movable contact 25 is stably supported by the first fixed contact 231, the second fixed contact 232, and the support portion 233.

  In addition, instead of the movable contact 25 shown in FIG. 3, the force that moves the movable contact 25 is a triangular centroid whose apex is defined by the first fixed contact 231, the second fixed contact 232, and the support portion 233 ( A movable contact 25 configured to act on a portion corresponding to the center of the triangle) can also be employed.

  In other words, the movable contact 25 includes a first movable contact 251, a second movable contact 252, and a contact portion 253. When the movable contact 25 is located at the first position, the first movable contact 251, the second movable contact 252, and the contact portion 253 are in contact with the first fixed contact 231, the second fixed contact 232, and the support portion 233, respectively. . The electromagnet device 1 includes a shaft 26 that transmits a force for moving the movable contact 25 to a predetermined region of the movable contact 25. The predetermined region coincides with a triangular centroid defined by the first movable contact 251, the second movable contact 252, and the contact portion 253 as vertices.

  Specifically, the movable contact 25 shown in FIG. 4 has a main plate portion 254 and an auxiliary plate portion 255. The main plate portion 254 has a length along the first direction in which the first fixed contact 231 and the second fixed contact 232 are arranged. The auxiliary plate portion 255 extends from the main plate portion 254 along a second direction that intersects the first direction. The first fixed contact 231 and the second fixed contact 232 are in contact with the first movable contact 251 and the second movable contact 252 of the main plate portion 254 when the movable contact 25 is located at the first position. The contact 231 and the second fixed contact 232 are disposed. And the support part 233 is arrange | positioned so that the support part 233 may contact the contact part 253 of the auxiliary | assistant board part 255, when the movable contactor 25 is located in a 1st position. The shaft hole 27 of the movable contact 25 is located at a position corresponding to the center (centroid) of an equilateral triangle whose vertex is defined by the first fixed contact 231, the second fixed contact 232, and the support portion 233. In other words, the shaft hole 27 of the movable contact 25 is located at the center of an equilateral triangle whose vertex is defined by the first movable contact 251, the second movable contact 252, and the contact portion 253.

  Therefore, the force that the movable contact 25 receives from the spring 29 when the movable contact 25 moves from the second position to the first position is applied to each of the first movable contact 251, the second movable contact 252, and the contact portion 253. It is divided equally and transmitted to the first fixed contact 231, the second fixed contact 232, and the support portion 233. Therefore, it is possible to suppress vibration when the movable contact 25 comes into contact with the first fixed contact 231, the second fixed contact 232, and the support portion 233.

  When the movable contact 25 is positioned at the first position, the spring 29 applies a force equally to each of the first movable contact 251, the second movable contact 252, and the contact portion 253. As a result, the first movable contact 251, the second movable contact 252, and the contact portion 253 are kept in contact with the first fixed contact 231, the second fixed contact 232, and the support portion 233, respectively, with the same force. It is possible to suppress vibration when the movable contact 25 continues to contact the first fixed contact 231, the second fixed contact 232, and the support portion 233.

  When the movable contact 25 shown in FIG. 4 is employed in the electromagnetic relay shown in FIG. 1, the first fixed contact 231, the first fixed contact 231, 2 The positions of the fixed contact 232 and the support portion 233 are set as appropriate.

  Further, the technical feature that the support portion 233 is disposed on the vertical bisector L50 of the line segment connecting the first fixed contact 231 and the second fixed contact 232 is that the support portion 233 has electrical insulation. It can be adopted independently of the technical feature.

  In this case, the contact device 2 includes a first fixed contact 231, a second fixed contact 232, and a movable contact 25. The first fixed contact 231 and the second fixed contact 232 are arranged side by side. The movable contact 25 is configured to be movable between a first position and a second position. When the movable contact 25 is located at the first position, the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232. Thereby, the movable contact 25 electrically connects the first fixed contact 231 and the second fixed contact 232. The contact device 2 further has a support part 233. When the movable contact 25 is located at the first position, the support portion 233 contacts the movable contact 25 together with the first fixed contact 231 and the second fixed contact 232. Therefore, when the movable contact 25 is located at the first position, the support portion 233 supports the movable contact 25 together with the first fixed contact 231 and the second fixed contact 232. The support portion 233 is disposed on a vertical bisector L50 of a line segment connecting the first fixed contact 231 and the second fixed contact 232.

  Therefore, the support portion 233 does not make the vibration generated between the movable contact 25 and the first fixed contact 231 and the second fixed contact 232 uneven. That is, it is possible to support the movable contact 25 at three locations while making the pressure when the movable contact 25 contacts the first fixed contact 231 and the second fixed contact 232 uniform.

  Further, the technical feature that the force for moving the movable contact 25 acts on the portion corresponding to the polygonal centroid whose apex is defined by the first fixed contact 231, the second fixed contact 232, and the support portion 233 is as follows. The support portion 233 can be employed independently of the technical feature that it has electrical insulation.

  In this case, the electromagnetic relay includes the contact device 2 and the electromagnet device 1. The contact device 2 includes a first fixed contact 231, a second fixed contact 232, and a movable contact 25. The first fixed contact 231 and the second fixed contact 232 are arranged side by side. The movable contact 25 is configured to be movable between a first position and a second position. When the movable contact 25 is located at the first position, the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232. Thereby, the movable contact 25 electrically connects the first fixed contact 231 and the second fixed contact 232 to each other. When the movable contact 25 is located at the second position, the movable contact 25 is separated from the first fixed contact 231 and the second fixed contact 232. The contact device 2 further has a support part 233. When the movable contact 25 is located at the first position, the support portion 233 contacts the movable contact 25 together with the first fixed contact 231 and the second fixed contact 232. Therefore, when the movable contact 25 is located at the first position, the support portion 233 supports the movable contact 25 together with the first fixed contact 231 and the second fixed contact 232. The electromagnet device 1 moves the movable contact 25 between the first position and the second position. The electromagnet device 1 has a shaft 26 that transmits a force for moving the movable contact 25 to the movable contact 25. The electromagnet device 1 is configured to apply a force for moving the movable contact 25 to a predetermined portion of the movable contact 25. A predetermined portion of the movable contact 25 acts on a portion corresponding to a polygonal centroid whose apex is defined by the first fixed contact 231, the second fixed contact 232, and the support portion 233.

  As a result, the first movable contact 251, the second movable contact 252, and the contact portion 253 are kept in contact with the first fixed contact 231, the second fixed contact 232, and the support portion 233, respectively, with the same force. Therefore, it is possible to suppress vibration when the movable contact 25 continues to contact the first fixed contact 231, the second fixed contact 232, and the support portion 233.

  Further, in the electromagnetic relay shown in FIG. 1, when the movable contact 25 is located at the first position, the movable contact 25 is supported by three places of the first fixed contact 231, the second fixed contact 232, and the support portion 233. Has been. However, it is also possible to support the movable contact 25 at three or more locations. In other words, the contact part 253 may be one or more.

  FIG. 5 shows the relationship between the movable contact 25, the first fixed contact 231, the second fixed contact 232, and the plurality of support portions 233. The first fixed contact 231 and the second fixed contact 232 shown in FIG. 5 are arranged in the first direction (left-right direction) as in FIG. On the other hand, each support portion 233 is disposed so as to be positioned on a straight vertical bisector L50 connecting the first fixed contact 231 and the second fixed contact 232. Each support portion 233 is arranged so as to be shifted from a straight line connecting the first fixed contact 231 and the second fixed contact 232. In other words, the instruction units 233 are not arranged in a straight line with the first fixed contact 231 and the second fixed contact. One support part 233 is located on the opposite side to the other support part 233 when viewed from the first fixed contact 231 and the second fixed contact 232. Further, the first fixed contact 231, the second fixed contact 232, and the plurality of support portions 233 are arranged along a plane parallel to the first surface (upper surface) of the movable contact 25.

  The movable contact 25 has a first movable contact 251, a second movable contact 252, and a plurality of contact portions 253 on its first surface (upper surface). The first movable contact 251 is located at a position facing the first fixed contact 231. The second movable contact 252 is located at a position facing the second fixed contact 232. Each contact portion 253 is disposed at a position facing the support portion 233. Thereby, when the movable contact 25 is located at the second position, the movable contact 25 is separated from the first fixed contact 231, the second fixed contact 232, and the plurality of support portions 233. On the other hand, when the movable contact 25 is located at the first position, the first fixed contact 231 and the second fixed contact 232 are in contact with the first movable contact 251 and the second movable contact 252, and each support portion 233 is in contact. It contacts the part 253. More specifically, when the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232, the movable contact 25 also comes into contact with the support portion 253. When the movable contact 25 is positioned at the first position, the movable contact 25 continues to be in contact with all of the first fixed contact 231, the second fixed contact 232, and each indication unit 233.

  With this configuration, the force that the movable contact 25 receives when the movable contact 25 moves from the second position to the first position is the first movable contact 251, the second movable contact 252, and the plurality of contact portions 253, respectively. And is transmitted to the first fixed contact 231, the second fixed contact 232, and the plurality of support portions 233. Therefore, it is possible to suppress vibration when the movable contact 25 comes into contact with the first fixed contact 231, the second fixed contact 232, and the support portion 233. In addition, vibration can be suppressed when the movable contact 25 continues to contact the first fixed contact 231, the second fixed contact 232, and the support portion 233.

  Further, in the first fixed contact 231, the second fixed contact 232, and the plurality of support portions 233 shown in FIG. 5, the force that moves the movable contact 25 is the first fixed contact 231, the second fixed contact 232, and the plurality of support portions. It is also possible to employ a movable contact 25 configured to act on a portion corresponding to a quadrangular centroid whose apex is defined by H.233.

  In FIG. 5, a rectangular movable contact 25 is employed, but the shape of the movable contact 25 is not limited to a square. That is, a polygonal movable contact 25 can be employed. In this case, the force for moving the movable contact 25 acts on the portion corresponding to the center (centroid) of the polygon whose vertex is defined by the first fixed contact 231, the second fixed contact 232, and the plurality of contact portions 253. Can be configured to.

  The electromagnetic relay shown in FIG. 1 includes an electromagnet device 1 and a contact device 2. The contact device 2 includes a movable contact 25, a first fixed contact 231, a second fixed contact 232, and a support part 233. The movable contact 25 has a first surface. The first fixed contact 231, the second fixed contact 232, and the support portion 233 are disposed so as to face the first surface of the movable contact 25. The movable contact 25 is configured to be movable between a first position and a second position. When the movable contact 25 is located at the first position, the movable contact 25 is configured to contact the first fixed contact 231 and the second fixed contact 232. When the movable contact 25 comes into contact with the first fixed contact 231 and the second fixed contact 232, the first fixed contact 231 is electrically connected to the second fixed contact 232 by the movable contact 233. When the movable contact 25 is located at the first position, the support portion 233 supports the movable contact 25 together with the first fixed contact 231 and the second fixed contact 232. When the movable contact 25 is located at the second position, the movable contact 25 is configured to be separated from the first fixed contact 231 and the second fixed contact 232. The electromagnet device 1 is configured to move the movable contact 25 between the first position and the second position.

  However, the means for operating the contact device 2 is not limited to the electromagnet device 1. For example, the movable contact 25 can be operated by a gear, and can also be operated by a motor.

  Further, in the electromagnetic relay shown in FIG. 1, the movable iron core 7 is disposed on the side opposite to the movable contact 25 when viewed from the fixed iron core 6. Thereby, the movable contact 25 moves as the movable iron core 7 moves from the initial position toward the contact position. However, it is also possible to arrange the movable iron core 7 and the fixed iron core 6 at different positions. When the fixed iron core is disposed so as to be located on the opposite side of the movable contact as viewed from the movable iron core, the first fixed contact, the second fixed contact, and the support portion are formed by the movable contact and the movable iron core. It arrange | positions so that it may be located in between.

Electromagnet device 1
Contact device 2
First fixed contact 231
Second fixed contact 232
Support part 233
Movable contactor 25
Shaft 26

Claims (7)

A first fixed contact and a second fixed contact arranged side by side;
Movable movable between a first position where the first fixed contact and the second fixed contact are electrically connected to each other and a second position which is separated from the first fixed contact and the second fixed contact. With contacts,
A contact having an electrically insulating support portion that contacts and supports the movable contact together with the first fixed contact and the second fixed contact when the movable contact is in the first position. apparatus. An electromagnetic relay comprising the contact device according to claim 1,
The electromagnetic relay further comprising an electromagnet device that moves the movable contact between the first position and the second position.   The electromagnetic relay according to claim 2, wherein the support portion is disposed on a perpendicular bisector connecting a line connecting the first fixed contact and the second fixed contact. The electromagnet device has a shaft that transmits a force for moving the movable contact to the movable contact;
The force that moves the movable contact acts on a portion corresponding to a polygonal centroid whose apex is defined by the first fixed contact, the second fixed contact, and the support portion. Item 4. The electromagnetic relay according to Item 2 or 3.   The number of said support parts is one or more, The electromagnetic relay in any one of Claims 2-4 characterized by the above-mentioned. A first fixed contact and a second fixed contact arranged side by side;
Movable movable between a first position in contact with and electrically connected to the first fixed contact and the second fixed contact, and a second position spaced from the first fixed contact and the second fixed contact. With contacts,
When the movable contactor is in the first position, the support unit supports the movable contactor in contact with the first fixed contact and the second fixed contact;
The contact device is characterized in that the support portion is disposed on a perpendicular bisector connecting a line connecting the first fixed contact and the second fixed contact. The first fixed contact and the second fixed contact, the first fixed contact and the second fixed contact, which are arranged side by side, are in contact with and electrically connected to the first fixed contact and the second fixed contact. A movable contact that is movable between a contact and a second position that is spaced apart from the contact, and contacts the movable contact together with the first fixed contact and the second fixed contact when the movable contact is in the first position. A contact device having a support portion to be supported,
An electromagnet device that moves the movable contact between the first position and the second position;
The electromagnet device has a shaft that transmits a force for moving the movable contact to the movable contact;
The electromagnetic force that moves the movable contact acts on a portion corresponding to a polygonal centroid whose apex is defined by the first fixed contact, the second fixed contact, and the support portion. relay.

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