JP2013246870A - Contact device - Google Patents

Abstract

Provided is a contact device capable of increasing a contact pressure when a contact is closed by using a magnetic attractive force.
A pair of fixed terminals each having a fixed contact, a movable contact that contacts and separates each fixed contact, a contact pressure spring that biases the movable contact, a top plate, The holding member 3 that holds and holds the movable contact 2 and the contact pressure spring 33 between the bottom plate 31, the movable shaft 20 that fixes the holding member 3 to one end, and the magnetism between the movable iron core 7 and the fixed iron core 8. And an electromagnet block B1 that drives the movable shaft 20 by generating an attractive force. A pin 9 is provided between the movable contact 2 and the bottom plate 31, and the tip of the pin 9 and the tip of the pin 9 face each other. The pin 9 is formed in such a dimension that the maximum value of the distance to the part to be performed is smaller than the maximum value of the distance between the iron cores 7 and 8.
[Selection] Figure 1

Description

  The present invention relates to a contact device.

  Conventionally, as a power load electromagnetic relay, a pair of fixed contacts in which both ends of a movable contact supported on one end of a drive shaft that reciprocates in the axial direction based on excitation and demagnetization of an electromagnetic block are arranged side by side There are known electromagnetic relays that are connected to and separated from each other. Such an electromagnetic relay is disclosed in Patent Document 1, for example.

  The electromagnetic relay described in Patent Literature 1 is inserted through the drive shaft so as to be positioned between the leaf spring having a substantially V-shaped cross section inserted through the drive shaft and the movable contact and the leaf spring. And a coil spring that urges the fixed contact side. And when a movable contact contact | abuts to a fixed contact and compresses a coil spring, it has the structure which presses the lower surface of a movable contact to the fixed contact side by the both ends of a leaf | plate spring.

JP 2010-10057 A

  By the way, in the electromagnetic relay (contact device) as in the above-described conventional example, the drive shaft and the movable contact are moved using the magnetic attractive force acting between the fixed iron core and the movable iron core. And when a movable contact contacts each fixed contact, the force which a movable contact presses a fixed contact, ie, contact pressure, is enlarged by using the energizing force of springs, such as a coil spring and a leaf spring.

  However, in the contact device as in the above conventional example, when the contact is closed, the movable iron core comes into contact with the fixed iron core, and the movement of the movable iron core is restricted, so that the magnetic attractive force does not contribute to the contact pressure. was there.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a contact device capable of increasing a contact pressure at the time of closing a contact using a magnetic attractive force.

  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, and the movable contact in a direction in which the movable contact contacts the fixed contact. A contact pressure spring that urges each of the fixed contacts and the movable contact, and a top plate and a bottom plate that are provided at predetermined intervals along the contact / separation direction between the fixed contact and the movable contact. A holding member that sandwiches and holds the movable contactor and the contact pressure spring, a movable shaft that fixes the holding member to one end, a movable iron core that is fixed to the other end of the movable shaft, and the movable iron core, An electromagnet block that drives the movable shaft by generating a magnetic attractive force between both of the opposing fixed cores, and a pin is provided between the movable contact and the bottom plate, and the tip of the pin And a portion where the tip of the pin faces Maximum value of the distance, characterized in that to form the pins becomes smaller dimension than the maximum value of the distance between the movable core and the fixed iron core.

  In this contact device, it is preferable to provide a plurality of the pins.

  In this contact device, it is preferable that the pin is provided so that the tip end portion of the pin abuts on both sides of a line connecting the centers of the portions that abut the fixed contacts of the movable contact.

  In this contact device, it is preferable that the pin is formed integrally with the holding member.

  In this contact device, it is preferable that the pin is formed integrally with the movable contact.

  According to the present invention, when the contact is closed, the tip of the pin comes into contact with the member facing the tip of the pin before the movable core comes into contact with the fixed core. For this reason, the movement of the movable iron core is not restricted by the fixed iron core when the contact is closed. Therefore, in the present invention, not only the biasing force of the contact pressure spring but also the magnetic attractive force can be used to increase the contact pressure when the contact is closed.

(A) is the principal part schematic at the time of closing of the contact in Embodiment 1 of the contact apparatus which concerns on this invention, (b) is the principal part schematic at the time of closing of the contact in the conventional contact apparatus. It is sectional drawing which shows the basic composition of the contact apparatus which concerns on this invention. It is a figure which shows the other structure in a contact device same as the above, (a) is a principal part schematic, (b) is the top view seen from the downward direction of a movable contact. It is a figure which shows Embodiment 2 of the contact apparatus which concerns on this invention, (a) is a principal part schematic diagram at the time of forming a pin integrally with a holding member, (b) is forming the pin integrally with a movable contactor. It is a principal part schematic diagram in the case.

(Embodiment 1)
Hereinafter, a contact device according to a first embodiment of the present invention will be described with reference to the drawings. In the following description, the top, bottom, left, and right in FIG. 1A are defined as the top, bottom, left, and right directions, 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. In addition, FIGS. 1 and 3 shown below show an outline of a main part of the present embodiment, and a part of the configuration is omitted. Further, FIG. 2 is a diagram showing a basic configuration of the present embodiment, and illustration of pins 9 described later is omitted. In the present embodiment, as shown in FIGS. 1A and 2, the contact block A1 and the electromagnet block B1 are integrally combined and housed in a hollow box-shaped housing (not shown).

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

  The movable contact 2 is formed in a rectangular flat plate shape, and is arranged at a position facing each fixed contact 10 at a predetermined interval along the vertical direction. Further, an insertion hole 2 </ b> A is provided through the center of the movable contact 2. The insertion hole 2A is inserted through the upper end of a long rod-shaped movable shaft 20 along the vertical direction. Further, a screw portion 20A that is screwed into a screw hole 70 of the movable iron core 7 to be described later is formed at the lower end portion of the movable shaft 20.

  A holding member 3 that holds a contact pressure spring 33 described later is fixed to the upper end portion of the movable shaft 20. The holding member 3 includes a top plate 30, a bottom plate 31, and a pair of side plates 32 each formed in a rectangular plate shape. The top plate 30 is fixed to the upper end portion of the movable shaft 20. The bottom plate 31 is fixed in the middle of the movable shaft 20 with a predetermined distance from the top plate 30 along the vertical direction. Further, an insertion hole 31 </ b> A for inserting the movable shaft 20 is provided through the center portion of the bottom plate 31. One side plate 32 connects the front end portion of the top plate 30 and the front end portion of the bottom plate 31 in front of the movable contact 2. The other side plate 32 connects the rear end portion of the top plate 30 and the rear end portion of the bottom plate 31 behind the movable contact 2.

  The contact pressure spring 33 is formed of a coil spring, and the lower end of the contact pressure spring 33 comes into contact with the center of the upper surface of the bottom plate 31 of the holding unit 3. Further, the upper end of the contact pressure spring 33 is positioned with respect to the movable contact 2 by fitting a positioning projection (not shown) formed on the lower surface of the movable contact 2 to the inner diameter portion thereof. . That is, the movable contact 2 and the contact pressure spring 33 are sandwiched by the top plate 30 and the bottom plate 31 of the holding member 3 along the extending and contracting direction of the contact pressure spring 33, and the contact pressure spring 33 is in a compressed state.

  The sealing container 4 includes a case 40 and a flange 41. The case 40 is formed in a hollow box shape whose bottom surface is opened from a heat-resistant material such as ceramic, and a pair of through holes 40A are provided through the top surface. And the upper edge of the flange 41 is joined to the opening periphery of the case 40 by brazing. Furthermore, the sealing container 4 which seals each fixed contact 10 and the movable contact 2 is completed by joining the lower end edge of the flange 41 to the upper surface of the 1st yoke plate 60 mentioned later. 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.

  In addition, an arc generated between each fixed contact 10 and the movable contact 2 (hereinafter simply referred to as “between contacts”) is insulated from the joint between the case 40 and the flange 41 at the opening of the case 40. Insulating member 42 is provided. The insulating member 42 is made of an insulating material such as ceramic or synthetic resin, and is formed in a hollow box shape having an upper surface opened. The upper end portion of the peripheral wall of the insulating member 42 is in contact with the inner wall of the case 40. Thereby, the insulation between each fixed contact 10 and the movable contact 2 and the joint portion between the case 40 and the flange 41 is achieved. Further, an insertion hole 42 </ b> A for inserting the movable shaft 20 is provided through the central portion of the insulating member 42.

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

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

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

  A cylindrical member 54 having a bottomed cylindrical shape with a flange 54A formed at the upper end is inserted through the insertion hole 60B. The flange portion 54A is joined to the bottom surface of the recess 60A. A movable iron core 7 formed from a magnetic material in a columnar shape is accommodated in the lower end portion in the cylindrical member 54. A fixed iron core 8 formed in a cylindrical shape from a magnetic material is accommodated in an upper end portion in the cylindrical member 54 so as to face the movable iron core 7. A screw hole 70 is formed in the movable iron core 7 along the axial direction. The lower end portion of the movable shaft 20 is fixed to the movable iron core 7 by screwing the screw portion 20 </ b> A of the movable shaft 20 into the screw hole 70.

  In addition, a disc-shaped cap 64 whose peripheral edge is fixed to the outer peripheral edge of the recess 60 </ b> A is provided on the upper surface of the first yoke plate 60. The cap 64 has a concave portion 64 </ b> A that is recessed upward at the center thereof. By accommodating the flange 80 of the fixed core 8 inside the recess 64A, the fixed core 8 is prevented from coming off.

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

  A return spring 82 is provided in the inner cylinder portion 81 of the fixed iron core 8. The return spring 82 is formed of a coil spring, the lower end of which is in contact with the upper surface of the movable iron core 7, and the upper end of which is in contact with the lower surface of the cap 64. Here, the return spring 82 is housed in a compressed state between the movable iron core 7 and the cap 64. Therefore, the return spring 82 elastically biases the movable iron core 7 downward.

  Hereinafter, the opening / closing operation of the contact in this embodiment will be described with reference to FIG. In the present embodiment, the return spring 82 has a higher spring constant than the contact pressure spring 33. For this reason, the movable iron core 7 slides downward by the urging force of the return spring 82, and the movable shaft 20 moves downward accordingly. The movable contact 2 is pressed downward by the top plate 30 of the holding unit 3 and moves downward. For this reason, the movable contact 2 is separated from each fixed contact 10 in the initial state.

  When the exciting winding 53 is energized, the movable iron core 7 is attracted to the fixed iron core 8 and slides upward. At this time, the movable shaft 20 connected to the movable iron core 7 also moves upward in conjunction with it. Thereby, since the top plate 30 of the holding part 3 moves upward, the top plate 30 is separated from the movable contact 2, and the restriction on the upward movement of the movable contact 2 is released. Then, the movable contact 2 moves upward by the biasing force of the contact pressure spring 33, and the movable contact 2 abuts on each fixed contact 10, and the contacts are conducted.

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

  By the way, in the conventional contact device, as shown in FIG. 1B, the movable iron core 7 contacts the fixed iron core 8 when the contact is closed. Then, after the movable core 7 comes into contact with the fixed core 8, even if the movable core 7 tries to move upward by the magnetic attraction force acting between the two cores 7, 8, the movable core 7 is in contact with the fixed core 8, so Movement is hindered. For this reason, since the magnetic attraction force does not contribute to the contact pressure, in the conventional contact device, as shown in FIG. 1B, most of the contact pressure (arrow S1 in the figure) is the urging force of the contact pressure spring 33. (Arrow S2 in the figure).

  Therefore, in the present embodiment, as shown in FIG. 1A, a pin 9 that is long in the vertical direction and has a lower end fixed to the bottom plate 31 is provided inside the contact pressure spring 33. The pin 9 is formed in a cylindrical shape through which the movable shaft 20 is inserted. Since the pin 9 is fixed to the bottom plate 31 of the holding member 31, when the movable shaft 20 moves, the pin 9 is interlocked with the vertical movement of the movable shaft 20. In this embodiment, the pin 9 is formed with a dimension in which the maximum value of the distance between the upper end of the pin 9 and the movable contact 2 is smaller than the maximum value of the distance between the iron cores 7 and 8. Yes. That is, the distance between the upper end portion of the pin 9 and the movable contact 2 is shorter than the distance between the two cores 7 and 8 in a state where the energization to the excitation winding 53 is turned off.

  Therefore, in this embodiment, when the movable iron core 7 moves upward, the upper end portion of the pin 9 abuts against the movable contact 2 before the movable iron core 7 abuts against the fixed iron core 8. There is a magnetic gap between them. And since the upward movement of the movable iron core 7 is not regulated by the fixed iron core 8, the magnetic attractive force acting between the iron cores 7 and 8 contributes to the contact pressure. That is, in this embodiment, as shown in FIG. 1A, not only the urging force of the contact pressure spring 33 (arrow S2 in the figure) but also the magnetic attractive force acting between the iron cores 7 and 8 (in the figure). The contact pressure (arrow S1 in the figure) can be increased using arrow S3).

  As described above, in the present embodiment, when the contact is closed, before the movable iron core 7 comes into contact with the fixed iron core 8, the tip portion of the pin 9 comes into contact with the member facing the tip portion of the pin 9. . For this reason, since the movement of the movable iron core 7 is not restricted by the fixed iron core 8 at the time of closing the contact, not only the biasing force of the contact pressure spring 33 but also the magnetic contact force at the time of closing the contact is increased. can do.

  When a contact pressure equivalent to that of a conventional contact device is sufficient, the contact pressure can be reduced to a required level by reducing the attractive force due to the magnetic gap. In this case, the size of both the iron cores 7 and 8 can be reduced, and as a result, the entire contact device can be reduced in size.

  In the present embodiment, the movable shaft 20 is inserted into the inner tube portion of the pin 9, but the pin 9 may be disposed at a position different from the movable shaft 2. Even in this case, the same effects as described above can be obtained. Further, the pin 9 may be constituted by a pillar.

In the present embodiment, the contact pressure is increased using the magnetic attractive force as described above. For this reason, it goes without saying that a spring having a very large spring constant (that is, a small amount of deflection) can be applied as the contact pressure spring 33.
By the way, although only one pin 9 is provided in the present embodiment, a plurality (two in the drawing) of pins 9 may be provided as shown in FIGS. When a plurality of pins 9 are provided in this way, the tip of each pin 9 comes into contact with the movable contact 2, so that the movable contact 2 can be prevented from shaking.

  In particular, as shown in FIG. 3 (b), each pin 9 is brought into contact with each other on both sides of a line connecting the centers of the portions of the movable contact 2 that come into contact with each fixed contact 10. It is desirable to provide it. When the pins 9 are provided in this way, the movable contact 2 can be prevented from shaking in the front-rear direction, and the contact bounce and the sound associated with the contact bounce can be reduced.

(Embodiment 2)
Hereinafter, a second embodiment of the contact device according to the present invention will be described with reference to the drawings. However, since the basic configuration of the present embodiment is common to that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. FIG. 4 shows an outline of the main part of the present embodiment, and a part of the configuration is omitted. In the present embodiment, as shown in FIG. 4A, a plurality (two in the figure) of pins 34 are formed integrally with the bottom plate 31 of the holding member 3. The dimensions of each pin 34 are the same as those of the pin 9 of the first embodiment. That is, each pin 34 is formed with a dimension in which the maximum value of the distance between the upper end portion of each pin 34 and the movable contact 2 is smaller than the maximum value of the distance between the iron cores 7 and 8.

  As described above, in the present embodiment, each pin 34 is formed integrally with the holding member 3. For this reason, in the present embodiment, not only can the same effects as in the first embodiment be achieved, but also it is not necessary to prepare the pin 34 as a separate component like the pin 9, so the number of components is reduced and the cost is reduced. can do. Further, since each pin 34 is formed integrally with the holding member 3, the contact device can be easily assembled.

  Note that, as shown in FIG. 4B, the pin 21 may be formed integrally with the movable contact 21. The dimensions of the pin 21 are the same as those of the pin 9 of the first embodiment. That is, the pin 21 is formed with a dimension in which the maximum value of the distance between the lower end portion of the pin 21 and the bottom plate 31 of the holding member 3 is smaller than the maximum value of the distance between both the iron cores 7 and 8. Even with this configuration, the same effects as described above can be obtained.

DESCRIPTION OF SYMBOLS 1 Fixed terminal 10 Fixed contact 2 Movable contact 20 Movable shaft 3 Holding member 30 Top plate 31 Bottom plate 33 Contacting spring 7 Movable iron core 8 Fixed iron core 9 Pin B1 Electromagnetic block

Claims (5)

  A pair of fixed terminals each having a fixed contact, a movable contact contacting and separating from each fixed contact, and a contact pressure spring for biasing the movable contact in a direction in which the movable contact contacts the fixed contact And a top plate and a bottom plate provided at predetermined intervals along the direction of contact between the fixed contacts and the movable contact, the movable contact between the top plate and the bottom plate, and Both a holding member that holds and holds the contact pressure spring, a movable shaft that fixes the holding member to one end, a movable core that is fixed to the other end of the movable shaft, and a fixed core that is disposed opposite to the movable core. An electromagnet block that drives the movable shaft by generating a magnetic attractive force between the iron cores, a pin is provided between the movable contact and the bottom plate, and a tip end portion of the pin and a tip end of the pin The maximum value of the distance between the parts facing each other is Serial contact device, and forming the pins becomes smaller dimension than the maximum value of the distance between the movable core and the fixed iron core.   The contact device according to claim 1, wherein a plurality of the pins are provided.   3. The pin according to claim 2, wherein the pin is provided so that a tip end portion of the pin abuts on both sides of a line connecting a center of a portion of the movable contact that abuts on each fixed contact. Contact device.   The contact device according to claim 1, wherein the pin is formed integrally with the holding member.   The contact device according to any one of claims 1 to 3, wherein the pin is formed integrally with the movable contact.

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