JP2014238919A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device capable of reducing noises when the contact is opened.SOLUTION: The contact device includes: a pair of fixed contact 10; a movable contact 2; a movable shaft 20 that holds the movable contact 2 at one end of a shaft 200; a moving core 7 fixed to the other end of the shaft 200; a holding member 54 storing the moving core 7; an electromagnet block B1 that drives the moving core 7 by using a magnetic attraction force generated by the power; and a first plate 60 (isolation member) that separates an electromagnet block B1 from a space storing the fixed contact 10 and the movable contact 2. The first plate 60 is set so that the maximum value of the distance L1 between the movable contact 2 and the first plate 60 is smaller than the maximum value of the distance L2 between the moving core 7 and the bottom of the holding member 54.

Description

  The present invention relates to a contact device.

  Conventionally, a contact device suitable for a power load relay, an electromagnetic switch or the like is known, and is disclosed in, for example, Patent Document 1. The contact device described in Patent Document 1 includes a fixed terminal provided with a fixed contact, a movable contact provided with a movable contact contacting and separating from the fixed contact, a rod-shaped movable shaft on which the movable contact is fixed to one end side, and And a movable iron core fixed to the other end of the movable shaft, and a fixed iron core facing the movable iron core. The contact device also includes an electromagnet device that generates a magnetic attraction force between the fixed iron core and the movable iron core by exciting the coil, and moves the movable iron core in a direction that contacts the fixed iron core, and a direction that moves the movable iron core away from the fixed iron core. And a return spring that is elastically biased.

  This contact device operates as follows. Before the excitation of the coil by the electromagnet device, the movable contact faces the fixed contact with a predetermined distance. When the coil is excited, the movable iron core is attracted to the fixed iron core, the movable shaft and the movable contactor are driven, and the movable contact contacts the fixed contact. When the excitation of the coil is cut, the movable contact and the movable iron core are restored to the original state mainly by the urging force of the return spring, and the movable contact is separated from the fixed contact.

JP 2006-310248 A

  Here, in the contact device as in the conventional example, in order to prevent the movable iron core from repeatedly moving up and down when the contact is opened, vibration is attenuated by applying the movable iron core to the bottom of the holding member in which the movable iron core is housed. I am letting. However, in this case, there is a problem that the sound when the movable iron core collides with the bottom of the holding member is loud and becomes noise.

  The present invention has been made in view of the above points, and an object thereof is to provide a contact device capable of reducing noise at the time of opening a contact.

  The contact device of the present invention includes a pair of fixed terminals each having a fixed contact, a movable contact contacting and separating from each fixed contact, a rod-shaped shaft portion, and the movable contact at one end of the shaft portion. A movable shaft that is held, a movable iron core that is fixed to one end opposite to the one end of the shaft portion, a holding member that houses the movable iron core, and a magnetic attraction force that is energized to utilize the movable iron core. An electromagnet block to be driven; a separation member that separates the electromagnet block from a space in which each of the fixed contacts and the movable contact is housed; and a maximum distance between the movable contact and the separation member is The isolation member is provided so as to be smaller than the maximum value of the distance between the movable iron core and the bottom of the holding member.

  In this contact device, it is preferable that the isolation member has a protrusion protruding toward the movable contact, and the isolation member and the movable contact are in contact with each other via the protrusion.

  In this contact device, it is preferable that a plurality of the protrusions are provided, and the protrusions are configured to have different height dimensions along the contact opening / closing direction.

  In this contact device, the protrusion is preferably formed of a material different from that of the isolation member.

  In this contact device, the protrusion is preferably formed of an insulator.

  In the present invention, when the contact is opened, the movable contact is brought into contact with the isolation member in a state where a gap is provided between the movable core and the bottom of the holding member, and the movement of the movable core is restricted. For this reason, in this invention, since a movable iron core does not collide with the bottom part of a holding member, the noise at the time of opening of a contact can be reduced.

It is a figure which shows the contact apparatus which concerns on embodiment of this invention, (a) is a figure at the time of closing of a contact, (b) is a figure at the time of opening of a contact. It is a figure which shows the conventional contact apparatus, (a) is a figure at the time of closing of a contact, (b) is a figure at the time of opening of a contact. In the contact device which concerns on embodiment of this invention, it is a figure which shows the structure which protruded a part of 1st board, (a) is a figure at the time of closing of a contact, (b) is a figure at the time of opening of a contact. is there. In the contact device which concerns on embodiment of this invention, it is a figure which shows the structure which provided the several protrusion in the 1st board, (a) is a figure at the time of closing of a contact, (b) is a figure at the time of opening of a contact. is there. In the contact device which concerns on embodiment of this invention, it is a figure which shows the structure which provided the some protrusion from which the height dimension mutually differs in the 1st board, (a) is a figure at the time of closing of a contact, (b), ( c) is a diagram when the contact is opened.

  Hereinafter, in describing a contact device according to an embodiment of the present invention, first, a conventional contact device will be described with reference to FIG. In the following description, the vertical and horizontal directions are defined with the vertical and horizontal directions in FIG. As shown in FIGS. 2A and 2B, the contact device includes a contact block A1 and an electromagnet block B1.

  The contact block A1 includes a pair of fixed terminals 1, a movable contact 2, a first spring (contact pressure spring) 3, and a sealing container 4. Each fixed terminal 1 is formed in a cylindrical shape from a conductive material such as copper. A fixed contact 10 that contacts and separates from the movable contact 2 is fixed to the lower end of each fixed terminal 1. In addition, it is good also considering the lower end itself of each fixed terminal 1 as the fixed contact 10, respectively. On the upper end of each fixed terminal 1, a flange 11 exposed to the outside of a case 40 described later is formed. Each rod 11 is joined to the case 40 by brazing.

  The movable contact 2 is formed in a flat plate shape that is long in the left-right direction. The movable contact 2 is disposed at a position facing each fixed contact 10 along the vertical direction. Further, the upper end of a movable shaft 20 described later passes through the center of the movable contact 2 in the left-right direction. A movable iron core 7 described later is attached to the lower end of the movable shaft 20.

  The movable shaft 20 includes a rod-shaped shaft portion 200 that is long in the vertical direction, and a hook-shaped restriction portion 201 that is integrally formed at the upper end of the shaft portion 200. The restricting unit 201 restricts the upward movement of the movable contact 2 (direction toward each fixed contact 10) by contacting the upper surface of the movable contact 2.

  The first spring 3 is composed of a coil spring, and its upper end is fitted into a recess 21 provided at the lower part of the movable contact 2. The lower end of the first spring 3 is positioned on the upper surface of a cap 64 described later. Accordingly, the first spring 3 is disposed between the movable contact 2 and a cap 64 described later, and biases the movable contact 2 upward (in the direction toward each fixed contact 10) by its elastic force.

  That is, the movable contact 2 is sandwiched between the restriction portion 201 and the first spring 3 at the upper end of the shaft portion 200. Therefore, the movable shaft 20 holds the movable contact 2 at the upper end (one end) of the shaft portion 200.

  The sealing container 4 includes a case 40 and a flange 41. The case 40 is made of a heat-resistant material such as ceramic and is formed in a hollow box shape having an open bottom surface. The upper end of the flange 41 is joined to the periphery of the opening of the case 40 by brazing. By joining the lower end of the flange 41 to the upper surface of the first plate 60 to be described later, the sealed container 4 that seals each fixed contact 10 and the movable contact 2 is completed. Inside the sealing container 4, a mixed gas mainly containing hydrogen is sealed. For this reason, it is possible to cool the arc that is generated when the contact is opened and closed.

  The electromagnet block B1 drives a movable iron core 7 by generating a magnetic attractive force between a movable iron core 7 and a fixed iron core 8, which will be described later, and includes a conductive wire 53, a bobbin 5, and a yoke 6. The bobbin 5 is made of a resin material and includes a cylindrical body 50 around which the conducting wire 53 is wound, a first flange 51 formed at the upper end of the cylindrical body 50, and a second flange 52 formed at the lower end of the cylindrical body 50. . The conducting wire 53 constitutes a coil for driving a movable iron core 7 to be described later by flowing an electric current.

  The conducting wire 53 has both ends connected to a pair of terminals (not shown) provided on the first flange 51. Each terminal is connected to a pair of coil terminals (not shown) via lead wires (not shown). Therefore, by connecting an external power source (not shown) to each coil terminal, current is passed from the external power source to the lead wire 53 via each coil terminal.

  Inside the cylindrical body 50, a bottomed cylindrical holding member 54 having a flange 540 formed at the upper end is disposed. In the holding member 54, the movable iron core 7 formed in a columnar shape from a magnetic material is accommodated. A fixed iron core 8 formed in a cylindrical shape from a magnetic material is accommodated at the upper end in the holding member 54 so as to face the movable iron core 7.

  The yoke 6 extends from the first plate 60 disposed on the upper side of the bobbin 5, the second plate 61 disposed on the lower side of the bobbin 5, and both the left and right ends of the second plate 61 toward the first plate 60. It is composed of a pair of third plates 62. The fixed iron core 8 passes through the center of the first plate 60. And the collar part 80 formed in the upper end of the fixed iron core 8 is exposed to the upper side of the 1st board 60. FIG. A disc-shaped cap 64 is attached to the upper surface of the first plate 60 so as to cover the flange 80. The cap 64 prevents the fixed iron core 8 from coming off.

  Here, as shown to Fig.2 (a), the 1st board 60 and the cap 64 are provided so that the internal space of the sealing container 4 and electromagnet block B1 may be separated. That is, the first plate 60 and the cap 64 correspond to “isolation members” that separate the space in which the fixed contacts 10 and the movable contact 2 are housed from the electromagnet block B1. Of course, if the configuration does not include the cap 64, only the first plate 60 corresponds to the “isolation member”.

  A cylindrical bush 63 made of a magnetic material is fitted into a gap formed between the inner peripheral surface at the lower end of the bobbin 5 and the outer peripheral surface of the holding member 54. The bush 63 forms a magnetic circuit together with the plates 60 to 62 of the yoke 6, the movable iron core 7, and the fixed iron core 8.

  A second spring (return spring) 82 is provided on the inner cylinder portion 81 of the fixed iron core 8. The second spring 82 biases the movable iron core 7 downward, and is composed of a coil spring. The upper end of the second spring 82 is in contact with the lower surface of the first plate 60 of the yoke 6, and the lower end thereof is in contact with the upper surface of the movable iron core 7. Accordingly, the second spring 82 is compressed by sandwiching the second spring 82 between the first plate 60 and the movable iron core 7.

  The contact opening / closing operation in the conventional contact device will be described below. In this contact device, the second spring 82 has a higher spring constant than the first spring 3. For this reason, when the conducting wire 53 is not energized, the movable iron core 7 moves downward by the elastic force of the second spring 82, and the movable shaft 20 moves downward accordingly. Then, the movable contact 2 is pressed downward by the restricting portion 201 interlocked with the movable shaft 20. For this reason, in the initial state where the conducting wire 53 is not energized, the movable contact 2 is separated from each fixed contact 10 and the contact is opened (off).

  When the conducting wire 53 is energized while the contact is open, the movable iron core 7 moves upward against the elastic force of the second spring 82 due to the magnetic attractive force between the movable iron core 7 and the fixed iron core 8. . At this time, since the movable shaft 20 also moves upward in conjunction with it, the restricting portion 201 is separated from the movable contact 2. Thereby, the restriction | limiting of the upward movement of the movable contact 2 is cancelled | released. Then, the movable contact 2 moves upward by the elastic force of the first spring 33, the movable contact 2 comes into contact with each fixed contact 10, and the contact is closed (turned on).

  Thereafter, when the energization to the conducting wire 53 is released, the movable iron core 7 moves downward by the elastic force of the second spring 82, and the movable shaft 20 also moves downward accordingly. Then, when the movable contact 2 is pressed downward by the restricting portion 201, the movable contact 2 is separated from each fixed contact 10, and the contact is opened. Here, in the conventional contact device, as shown in FIG. 2 (b), the movable iron core 7 collides with the bottom of the holding member 54 when the contact is opened.

  Next, the contact device according to the present embodiment will be described with reference to FIGS. In the following description, parts that are the same as those of the conventional contact device are denoted by the same reference numerals and description thereof is omitted. 1 (a) and 1 (b) show only the configuration necessary for the description of the contact device of the present embodiment, and are cross-sectional views seen from either the left or right side. Further, in FIGS. 1A and 1B, the cap 64 is not shown, but the cap 64 may be in contact with the movable contact 2 as an “isolation member”.

  In the contact device of the present embodiment, as shown in FIG. 1A, the maximum value of the distance L1 between the first plate 60 (isolation member) and the movable contact 2 is such that the movable iron core 7 and the holding member 54 It is comprised so that it may become smaller than the maximum value of distance L2 between bottoms. For this reason, in the contact device of this embodiment, as shown in FIG.1 (b), the movable contactor 2 contacts the 1st board 60 at the time of opening of a contact. Therefore, in the contact device according to the present embodiment, the movable iron core 7 does not move any further downward, so that the movable iron core 7 does not collide with the bottom of the holding member 54.

  Here, the present inventors have conducted an experiment for evaluating the noise at the time of opening of the contact in each of the contact device of the present embodiment and the conventional contact device. This experiment was performed by measuring the noise level using the A characteristic correction at a position 30 cm upward from the contact device. In this experiment, in the contact device of this embodiment, the noise at the time of opening the contact was reduced by about 6 dB (A) compared to the conventional contact device.

  As described above, in the contact device of the present embodiment, when the contact is opened, the movable contact 2 is separated from the first plate 60 (isolation) with a gap provided between the movable iron core 7 and the bottom of the holding member 54. The movement of the movable iron core 7 is restricted. For this reason, in the contact device of this embodiment, since the movable iron core 7 does not collide with the bottom part of the holding member 54, the noise at the time of opening of a contact can be reduced.

  As shown in FIGS. 3A and 3B, the contact device of the present embodiment has a configuration in which the first plate 60 (isolation member) has a protrusion 600 protruding toward the movable contact 2. May be. In this configuration, the first plate 60 and the movable contact 2 come into contact with each other through the protrusion 600. The maximum value of the distance L1 between the protrusion 600 and the movable contact 2 is configured to be smaller than the maximum value of the distance L2 between the movable iron core 7 and the bottom of the holding member 54.

  In this configuration, since only the projection 600 approaches the movable contact 2, the internal space of the sealing container 4 is ensured wider than the configuration in which the entire first plate 60 is brought close to the movable contact 2 (see FIG. 1). Can do. Therefore, in this configuration, a space necessary for extinguishing the arc generated between each fixed contact 10 and the movable contact 2 when the contact is opened can be secured without increasing the size of the contact device.

  Further, as shown in FIGS. 4A and 4B, the contact device of the present embodiment includes a plurality of (two in the drawing) in which the first plate 60 (isolation member) protrudes toward the movable contact 2. The structure which has this protrusion 601 may be sufficient. In this configuration, the first plate 60 and the movable contact 2 come into contact with each other through the protrusions 601. The maximum value of the distance L1 between each protrusion 601 and the movable contact 2 is configured to be smaller than the maximum value of the distance L2 between the movable iron core 7 and the bottom of the holding member 54. Even in this configuration, similarly to the configuration in which the first plate 60 has the protrusion 600, a space necessary for extinguishing the arc can be secured without increasing the size of the contact device.

  Further, as shown in FIG. 5A, the first plate 60 includes a plurality of (two in the drawing) protrusions 602 and 603 having different vertical dimensions (height dimensions along the contact opening / closing direction). The structure which has may be sufficient. In this configuration, the first plate 60 and the movable contact 2 come into contact with each other through the protrusions 602 and 603. The maximum value of the distance L1 between the protrusion 602 having a small height dimension and the movable contact 2 is configured to be smaller than the maximum value of the distance L2 between the movable iron core 7 and the bottom of the holding member 54. To do.

  In this configuration, when the contact is opened, the protrusion 603 having a large height first comes into contact with the movable contact 2 (see FIG. 5B), and then the protrusion 602 having a small height and the movable contact 2 are contacted. (Refer to FIG. 5C). In other words, in this configuration, the first plate 60 and the movable contact 2 come into contact with each other a plurality of times (here, twice) via the protrusions 602 and 603. Thereby, compared with the case where the 1st board 60 contacts the movable contact 2 once through one protrusion 600, the collision sound at the time of contact can be disperse | distributed.

  Note that the contact device of the present embodiment may be configured such that each of the protrusions 600 to 603 is formed of a material different from that of the first plate 60. In this configuration, for example, by forming the protrusions 600 to 603 from an elastic material, the impact when the movable contact 2 and the protrusions 600 to 603 come into contact can be reduced. Therefore, in this configuration, noise during opening of the contact can be further reduced as compared with the case where the protrusions 600 to 603 are formed integrally with the first plate 60.

  Further, the contact device of the present embodiment may be configured such that each of the protrusions 600 to 603 is formed of an insulator.

  In the contact device of the present embodiment, the first plate 60 has a configuration having the projections 600 to 603, but the movable contact 2, not the first plate 60, has a configuration having the projections 600 to 603. Good. Even with this configuration, an effect of reducing noise at the time of opening the contact can be achieved.

DESCRIPTION OF SYMBOLS 1 Fixed terminal 10 Fixed contact 2 Movable contact 20 Movable shaft 200 Shaft part 54 Holding member 60 1st board (isolation member)
7 Movable iron core B1 Electromagnet block

Claims (5)

A pair of fixed terminals each having a fixed contact; a movable contact contacting and separating from each fixed contact; a movable shaft having a rod-shaped shaft portion and holding the movable contact at one end of the shaft portion; A movable iron core fixed to one end of the shaft portion opposite to the one end, a holding member in which the movable iron core is housed, an electromagnet block that drives the movable iron core using a magnetic attraction force by energization, A separation member that separates each fixed contact and a space in which the movable contact is housed from the electromagnet block;
The isolation member is provided such that the maximum value of the distance between the movable contact and the isolation member is smaller than the maximum value of the distance between the movable iron core and the bottom of the holding member. Contact device to do.   The said isolation member has a protrusion which protrudes toward the said movable contact, It is comprised so that the said isolation member and the said movable contact may contact via the said protrusion. Contact device.   The contact device according to claim 2, wherein a plurality of the protrusions are provided, and each of the protrusions is configured to have different height dimensions along the contact opening / closing direction.   The contact device according to claim 2, wherein the protrusion is made of a material different from that of the isolation member.   The contact device according to claim 2, wherein the protrusion is formed of an insulator.

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