JP5853224B2 - Contact device and electromagnetic switching device using the same - Google Patents

Description

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

  2. Description of the Related Art Conventionally, an electromagnetic relay that opens and closes an electric circuit is known. For example, there is one disclosed in Patent Document 1. The electromagnetic relay described in Patent Document 1 includes a coil that generates an electromagnetic force when energized, a movable member that is driven by the electromagnetic force of the coil, a first fixed contact holding member that has a first fixed contact, and a second fixed member. A second fixed contact holding member having a contact and a third fixed contact. The movable member includes a movable core, a shaft, and an insulator. Further, the electromagnetic relay energizes the movable element in a direction in which the fixed contact and the movable contact come into contact with each other, the movable element having the first movable contact, the second movable contact, and the third movable contact that are in contact with and away from each fixed contact. And a return spring that urges the movable element in a direction in which the fixed contact and the movable contact are separated from each other.

  The electromagnetic relay is configured such that when the movable core or the like is driven by the electromagnetic force of the coil, the fixed contact and the movable contact come into contact with each other and the movable member and the movable element are separated from each other. Here, when the movable core or the like is driven by electromagnetic force, the contact portion between the first fixed contact and the first movable contact, the contact portion between the second fixed contact and the second movable contact, and the third fixed contact and the first Three-point contact is made at the contact portion with the three movable contacts. Therefore, the swing of the movable element when the three movable contacts collide with the three fixed contacts is prevented.

JP 2010-257923 A

  However, in the above-described conventional example, when the contacts are conducted or when a large current such as a short-circuit current flows between the contacts, the mover has a contact due to the influence of the magnetic field generated from the fixed contact holding member. The electromagnetic repulsive force is received in the direction of repulsion. Then, the contact pressure between the contacts decreases due to the electromagnetic repulsive force, so that the movable contact moves away from the fixed contact, and an arc is generated between the contacts at that moment. The generation of this arc may cause welding of the movable contact and the fixed contact.

  The present invention has been made in view of the above points, and provides a contact device capable of preventing a decrease in contact pressure acting between contacts by efficiently canceling an electromagnetic repulsive force, and an electromagnetic switch using the contact device. The purpose is to provide.

The contact device according to the present invention includes a fixed contact and a movable contact that are contacted and separated from each other, a movable contact provided with the movable contact, a shaft that is integrally linked to the movable contact, and the movable contact as the fixed contact. A contact pressure spring that urges in the direction of contact, and the shaft is provided with an extending portion extending from the tip of the shaft through the movable contact to the side opposite to the fixed contact side, and the extending portion A hook is provided at one end of the spring, and an auxiliary spring that biases the movable contact toward the fixed contact is provided between the hook and the movable contact. One end is in contact with the movable contact .

  In this contact device, it is preferable to provide a holder for holding the flange and the auxiliary spring.

  An electromagnetic switching device according to the present invention includes any one of the contact devices described above, and a driving unit that drives the movable contact of the contact device to bring the movable contacts into contact with and away from the fixed contacts. To do.

  The present invention has an effect that it is possible to prevent a decrease in contact pressure acting between the contacts by efficiently canceling the electromagnetic repulsion force.

It is a figure which shows embodiment of the contact apparatus which concerns on this invention, (a) is sectional drawing at the time of opening between contacts, (b) is sectional drawing at the time of closing between contacts. It is sectional drawing which shows embodiment of the electromagnetic switch which concerns on this invention. (A) is a figure which shows the movable contact of an electromagnetic switch apparatus same as the above, (b) is a figure which shows each fixed terminal of the electromagnetic switch apparatus same as the above.

  Hereinafter, embodiments of a contact device according to the present invention will be described with reference to the drawings. In the following description, the vertical direction in FIG. 1A is defined as the vertical direction, the front side of the paper is defined as the front direction, and the back side of the paper is defined as the rear direction. As shown in FIG. 1A, the contact device 1 according to the present embodiment includes a first fixed terminal 10 having a first fixed contact 10A and a second fixed contact 10B, and a third fixed contact 10C. And a second fixed terminal 11. Further, in the present embodiment, the movable contact 12 having movable contacts 12A to 12C that contact and separate from the fixed contacts 10A to 10C, respectively, and the movable contact 12 are biased in a direction to contact the fixed contacts 10A to 10C. And a contact pressure spring 13.

  Each of the fixed terminals 10 and 11 is formed in a rectangular plate shape from a conductive metal material. A first fixed contact 10A and a second fixed contact 10B formed of a conductive metal material are fixed to the upper surface of the first fixed terminal 10 with a certain distance from each other along the front-rear direction. . Further, a third fixed contact 10 </ b> C formed of a metal material having the same conductivity is fixed to the upper surface of the second fixed terminal 11.

  The movable contact 12 is formed in a rectangular plate shape from a conductive metal material, and on the lower surface thereof, the first movable contact 12A, the second movable contact 12B, The third movable contact 12C is fixed. Each of the movable contacts 12A to 12C is formed of a conductive metal material, like the fixed contacts 10A to 10C. The fixed contacts 10A to 10C and the movable contacts 12A to 12C are formed of a material having a smaller electric resistance than the material forming the fixed terminals 10 and 11 and the movable contact 12 in order to reduce the contact resistance. Is desirable.

  The contact pressure spring 13 is formed of a coil spring, and a lower end thereof abuts on the upper surface of the movable contact 12 and an upper end abuts on a wall surface (not shown) of a space in which the contact device 1 is accommodated. Therefore, when the urging force of the contact pressure spring 13 works, the movable contact 12 is urged in a direction (downward) toward the fixed contacts 10A to 10C.

  Below the movable contact 12, a metal shaft 14 that is driven by driving means described later and presses the movable contact 12 upward is disposed. A cap 14 </ b> A formed of an insulating resin material is disposed at the upper end portion of the shaft 14. In addition, a bar-like extending portion 15 that penetrates the movable contact 12 and extends upward is integrally formed at the upper end portion of the cap 14A. At the upper end portion of the extended portion 15, a flange portion 16 that extends along the radial direction of the extended portion 15 is provided, and the upper end portion of the auxiliary spring 17 is fixed to the lower surface of the flange portion 16.

  The auxiliary spring 17 is composed of a coil spring, and its upper end is fixed to the lower surface of the flange 16 as described above. Moreover, the collar part 16 and the auxiliary | assistant spring 17 are hold | maintained at the holder 18 formed in the box which opened both front and back from resin material, for example. That is, the auxiliary spring 17 is positioned between the lower surface of the flange portion 16 and the inner surface of the holder 18 by the lower end of the auxiliary spring 17 being in contact with the inner surface of the holder 18.

  Hereinafter, the operation of this embodiment will be described. In the following description, the movable contact 12 is driven by driving the shaft 14 in the vertical direction by driving means (not shown). As this driving means, for example, the electromagnet device 2 in an embodiment of an electromagnetic switching device described later is used. In addition, after the shaft 14 is driven and displaced, the position thereof is fixed until the shaft 14 is next driven.

  When the contact is open, the upper end of the cap 14A of the shaft 14 is in contact with the lower surface of the movable contact 12 as shown in FIG. Here, when the contact is open, the cap 14A of the shaft 14 is fixed at the initial position, so that the downward displacement of the movable contact 12 is restricted.

  Next, when the shaft 14 is driven downward, the cap 14 </ b> A is also displaced downward in conjunction with the shaft 14. Then, since the restriction of the downward displacement of the movable contact 12 by the cap 14A is released, the movable contact 12 is displaced downward (in the direction toward the fixed contacts 10A to 10C) by the biasing force of the contact pressure spring 13. To do. And as shown in FIG.1 (b), each movable contact 12A-12C contact | abuts to each fixed contact 10A-10C, and between contacts is closed.

  By the way, along with the downward displacement of the shaft 14, the extending portion 15 and the flange portion 16 are also displaced downward. Then, the lower surface of the holder 18 comes into contact with the movable contact 12, and the auxiliary spring 17 is compressed between the lower surface of the flange portion 16 and the inner surface of the holder 18. Here, since the position after the displacement of the shaft 14 is fixed, the position after the displacement of the flange portion 16 interlocking with the shaft 14 is also fixed. Therefore, when the biasing force of the auxiliary spring 17 works via the holder 18, the movable contact 12 is biased in the direction (downward) toward the fixed contacts 10A to 10C.

  Here, the movable contact 12 is repelled by the influence of the magnetic field generated from the fixed terminals 10 and 11 when the contact is conducted or when a large current such as a short circuit current flows between the contacts. The electromagnetic repulsive force is received in the direction of the movement (upward). However, in this embodiment, since the movable contact 12 is urged downward by the urging force of the auxiliary spring 17 as described above, the electromagnetic repulsive force is made efficient by the force opposite to this electromagnetic repulsive force by 180 degrees. Can cancel well.

  When the shaft 14 is driven upward, the cap 14 </ b> A is displaced upward in conjunction with the shaft 14, and the upper end portion of the cap 14 </ b> A contacts the lower surface of the movable contact 12. The cap 14A displaces the movable contact 12 upward against the urging force of the contact pressure spring 13, and returns to the initial position. Thereby, each movable contact 12A-12C leaves | separates from each fixed contact 10A-10C, and between contacts is opened.

  As described above, in the present embodiment, since the auxiliary spring 17 that urges the movable contact 12 in the direction toward each of the fixed contacts 10A to 10C is provided, the electromagnetic repulsive force can be canceled efficiently, It is possible to prevent a decrease in contact pressure acting on the surface. Therefore, the movable contacts 12A to 12C are not separated from the fixed contacts 10A to 10C due to a decrease in contact pressure between the contacts. For this reason, an arc does not generate | occur | produce between contacts, but it can prevent that each movable contact 12A-12C and each fixed contact 10A-10C weld by arc.

  In the present embodiment, the auxiliary spring 17 is positioned by providing the holder 18, but the holder 18 may not be provided. For example, the protrusion 16 (not shown) which protrudes downward may be provided in the lower surface of the collar part 16, and the structure which positions the auxiliary | assistant spring 17 by fitting the upper end part of the auxiliary | assistant spring 17 in the said protrusion may be sufficient. . Further, in the present embodiment, the contact portion is configured by the three movable contacts 12A to 12C and the three fixed contacts 10A to 10C, but the two movable contacts 12A and 12C and the two fixed contacts 10A and 10C. It may be configured.

  Hereinafter, an embodiment of an electromagnetic switching device provided with the contact device 1 will be described with reference to the drawings. In the following description, the vertical and horizontal directions in FIG. 2 are defined as the vertical and horizontal directions. Moreover, in the following description, illustration of the extending part 15, the collar part 16, the auxiliary spring 17, and the holder 18 in the contact device 1 is omitted.

  In the present embodiment, as shown in FIG. 2, in the hollow box-shaped housing 3, the contact device 1 and the movable contact 12 of the contact device 1 are driven to connect the movable contacts 12A to 12C to the fixed contacts 10A. 10C (refer to FIG. 3) and the electromagnet device 2 (driving means) to be brought into contact with and separated from each other. The housing 3 is made of a resin such as PBT (polybutylene terephthalate), for example, and is formed by combining two upper cases 30 and a lower case 31 as shown in FIG.

  The contact device 1 is disposed in a space covered by the upper case 30 and the lower case 31. Here, the upper end of the contact pressure spring 13 is fixed to the upper surface inside the upper case 30. The shaft 14 extends through the upper case 30 to the lower case 31 and is fixed so as to penetrate through a movable iron core 24 described later.

  Here, as shown to Fig.3 (a), 12 A of 1st movable contacts are arrange | positioned in the position shifted | deviated from the line which passes each center of the 2nd movable contact 12B and the 3rd movable contact 12C. Further, as shown in FIG. 3B, the first fixed contact 10A is arranged at a position shifted from a line passing through the centers of the second fixed contact 10B and the third fixed contact 10C.

  The fixed terminals 10 and 11 are integrally formed with load terminals 100 and 110 protruding from the right surface of the housing 3, respectively. One of the load terminals 100 and 110 is connected to an external power source (not shown), and the other is connected to an external load (not shown). In addition, since each other part of the contact apparatus 1 has already been demonstrated in the said embodiment, description is abbreviate | omitted here.

  As shown in FIG. 2, the electromagnet device 2 includes an excitation winding 20 wound around a coil bobbin 21, and a pair (one in the figure) of coil terminals 22 to which both ends of the excitation winding 20 are connected. Is provided. The electromagnet device 2 includes a fixed iron core 23 that is disposed and fixed in the coil bobbin 21, a movable iron core 24, and a return spring 25.

  The coil bobbin 21 is formed in a cylindrical shape from a resin material, and flanges 21A and 21B are formed on the upper end and the lower end, respectively. As described above, the excitation winding 20 is disposed in the cylindrical portion 21C between the flange portions 21A and 21B.

  The exciting winding 20 is connected to a pair of terminal portions (not shown) provided on the flange portion 21A of the coil bobbin 21 at both ends, and is connected to the coil terminals 22 through the terminal portions. Each coil terminal 22 is formed from a conductive metal material such as copper, and is provided so as to protrude from the right surface of the housing 3. The exciting winding 20 is energized by passing an exciting current through each coil terminal 22.

  The cylindrical portion 21 </ b> C of the coil bobbin 21 is provided with a fixed iron core 23 made of a magnetic material at the inner lower end. Here, a yoke 21D formed of a magnetic material is disposed below the coil bobbin 21. And the fixed iron core 23 is being fixed to the yoke 21D through the hole which is not shown provided in the lower end part of the coil bobbin 21. As shown in FIG. At the upper end portion of the fixed iron core 23, a downwardly recessed portion 23A into which the lower end portion of the movable iron core 24 is fitted is provided. A movable iron core 24 made of a magnetic material is movably disposed above the fixed iron core 23 inside the cylindrical portion 21 </ b> C of the coil bobbin 21. The lower end portion of the movable iron core 24 is provided with a storage recess 24A that is recessed upward, and a part of the return spring 25 is stored in the storage recess 24A.

  The return spring 25 is formed of a coil spring and is held between the upper surface in the housing recess 24 </ b> A of the movable iron core 24 and the lower surface in the recess 23 </ b> A of the fixed iron core 23. The return spring 25 is compressed when the movable iron core 24 is displaced downward, and biases the movable iron core 24 upward.

  Here, the outer diameter dimension of the movable iron core 24 is smaller than the outer diameter dimension of the fixed iron core 23, and a gap is generated between the cylindrical portion 21 </ b> C of the coil bobbin 21 and the movable iron core 24. In this gap, there is disposed a plate 26 formed of a magnetic material in a cylindrical shape and having a flange at the upper end. The fixed iron core 23, the movable iron core 24, the plate 26, and the yoke 21D form a magnetic circuit.

  Hereinafter, the operation of this embodiment will be described. First, when the excitation winding 20 is energized, the movable iron core 24 is attracted to the fixed iron core 23, whereby the shaft 14 fixed to the movable iron core 24 is displaced downward. Then, the cap 14 </ b> A is also displaced downward in conjunction with the shaft 14, so that the restriction of the downward displacement of the movable contact 12 by the cap 14 </ b> A is released, so that the movable contact 12 is biased by the contact pressure spring 13. Is displaced downward. And each movable contact 12A-12C contact | abuts to each fixed contact 10A-10C, and between contacts is closed.

  At this time, since each movable contact 12A-12C and each fixed contact 10A-10C contact at three points, the swing of the movable contact 12 when the contacts collide with each other is prevented. For this reason, generation | occurrence | production of the noise by the rocking | fluctuation of the movable contact 12 and the wear by friction of each movable contact 12A-12C and each fixed contact 10A-10C can be prevented.

  On the other hand, when the energization to the excitation winding 20 is interrupted, the movable iron core 24 is displaced upward by the urging force of the return spring 25, and the shaft 14 is also displaced upward. Then, the cap 14 </ b> A is displaced upward in conjunction with the shaft 14, so that the upper end portion of the cap 14 </ b> A comes into contact with the lower surface of the movable contact 12. The cap 14A displaces the movable contact 12 upward against the urging force of the contact pressure spring 13, and returns to the initial position. Thereby, each movable contact 12A-12C leaves | separates from each fixed contact 10A-10C, and between contacts is opened.

  As described above, since the contact device 1 is also used in the present embodiment, the electromagnetic repulsive force generated when a large amount of current such as a short-circuit current flows between the contacts or when the contacts are conducted is efficiently canceled. It is possible to prevent a decrease in contact pressure acting between the contacts. Therefore, the movable contacts 12A to 12C are not separated from the fixed contacts 10A to 10C due to a decrease in contact pressure between the contacts. For this reason, an arc does not generate | occur | produce between contacts, but it can prevent that each movable contact 12A-12C and each fixed contact 10A-10C weld by arc.

DESCRIPTION OF SYMBOLS 1 Contact apparatus 10 1st fixed terminal 11 2nd fixed terminal 10A-10C Fixed contact 12 Movable contactor 12A-12C Movable contact 14 Shaft 15 Extension part 16 ridge part 17 Auxiliary spring 18 Holder 2 Electromagnet apparatus (drive means)

Claims (3)

A fixed contact and a movable contact that are brought into contact with and away from each other, a movable contact provided with the movable contact, a shaft that is integrally linked to the movable contact, and a biasing direction in which the movable contact is brought into contact with the fixed contact. An extension portion that extends from the tip of the shaft through the movable contact to the opposite side of the fixed contact side, and a flange portion is provided at one end of the extension portion. An auxiliary spring that urges the movable contact toward the fixed contact is provided between the flange and the movable contact ;
One end portion of the contact pressure spring is in contact with the movable contact .   The contact device according to claim 1, further comprising a holder that holds the flange and the auxiliary spring. 3. An electromagnetic switching device comprising: the contact device according to claim 1; and driving means for driving the movable contact of the contact device to bring the movable contacts into and out of contact with the fixed contacts.

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