JP2014157830A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device capable of efficiently increasing the contact pressure between contact points.SOLUTION: The contact device includes: a pair of fixed terminals 33 each having a fixed contact point 32; a movable contact element 35 having a pair of movable contact points 34 which comes into contact with/separates away from the pair of fixed contact points 32; and a drive unit 8 that drives the movable contact element 35 so that the movable contact point 34 comes into contact with/separates away from the fixed contact point 32. The contact device further includes: a case 61 in which the pair of fixed terminals 33 are fixed; a yoke member 63 which is fixed within the case 61 between the pair of fixed terminals 33 facing the upper face of the movable contact element 35; and a yoke member 64 fixed to the lower face of the movable contact element 35. The yoke member 64 faces the yoke member 63 being interposed by the movable contact element 35.

Description

  The present invention relates to a contact device.

  Conventionally, by arranging a yoke plate opposite to one surface of the movable contact where the movable contact is disposed, when a current flows to the movable contact due to conduction between the contacts, the fixed contact is fixed to the movable contact. There is a contact device that generates an electromagnetic force to the side to increase the contact pressure between the contacts (see, for example, Patent Document 1).

  As an example of the contact device, for example, as shown in FIG. 21, a pair of fixed terminals 33 having a fixed contact 32, a movable contact 35 having a movable contact 34, a contact pressure spring 71, and a holding body 72. And a container 73, a yoke plate 74, and a movable shaft 75. Hereinafter, description will be made with reference to the top, bottom, left and right in FIG.

  The fixed terminal 33 is formed in a substantially cylindrical shape, and the fixed contact 32 is fixed to the lower end surface.

  The container 73 is formed of a heat-resistant material such as a ceramic material into a hollow, substantially rectangular box shape having an open lower end. The pair of fixed terminals 33 are provided through the upper surface of the container 73 so that the fixed contacts 32 are provided in parallel within the container 73.

  The movable contact 35 is formed from a conductive material in a substantially rectangular plate shape, and movable contacts 34 are respectively disposed on the left and right ends of the upper surface. The movable contact 35 is disposed in the container 73 with the movable contact 34 facing the fixed contact 32.

  The contact pressure spring 71 is formed of a coil spring, and the upper end of the contact pressure spring 71 comes into contact with the substantially lower center of the movable contact 35.

  The holding body 72 is formed in a substantially rectangular frame shape in cross section, and is connected to a movable shaft 75 that is driven in the axial direction by the electromagnet block 2.

  The yoke plate 74 is formed in a substantially rectangular plate shape from a magnetic material, and is fixed to the inside of the upper surface of the holding body 72.

  The movable contact 35 and the contact pressure spring 71 are disposed between the bottom surface of the holding body 72 and the yoke plate 74. Here, the contact pressure spring 71 is disposed in a compressed state. The lower end of the contact pressure spring 71 contacts the lower surface of the holding body 72, and the movable contact 35 is pressed upward by the contact pressure spring 71 and contacts the yoke plate 74.

  In the contact device, the movable shaft 75 is moved upward by the electromagnet block, and the holding body 72 is moved upward, that is, toward the fixed contact 32 along with the movement. Subsequently, the movable contact 35 held by the holding body 72 also moves upward along with the movement of the holding body 72, the movable contact 34 comes into contact with the fixed contact 32, and the contacts are conducted (FIG. 22 ( a)).

  When the movable contact 34 abuts on the fixed contact 32, the movement of the movable contact 35 toward the fixed contact 32 is restricted, and the position of the movable contact 35 is maintained even if the movable shaft 75 moves further upward. Does not change. On the other hand, since the holding body 72 continues to move upward, the distance between the lower surface of the holding body 72 and the movable contact 35 is shortened, and the contact pressure spring 71 is further compressed to move the movable contact 35 toward the fixed contact 32. The pressing force increases and the contact pressure between the contacts increases. Hereinafter, the distance that the holding body 72 moves after the contacts are conducted is referred to as an overtravel amount (OT amount).

  Further, since the yoke plate 74 is fixed to the holding body 72, the yoke plate 74 further moves upward in conjunction with the upward movement of the holding body 72, and the distance from the movable contact 35 (hereinafter referred to as gap G5). Is increased in proportion to the amount of OT.

  Further, the movable contact 35 is electrically connected between the contacts and a current flows, so that a magnetic flux is formed around the movable contact 35. Here, as shown in FIG. 23A, when a yoke (for example, a yoke plate 74) is not provided near the movable contact 35, a substantially concentric magnetic flux is formed around the movable contact 35. Is formed. On the other hand, as shown in FIG. 23 (b), when the yoke plate 74 is disposed in the vicinity of the movable contact 35, the magnetic flux generated around the movable contact 35 is attracted to the yoke plate 74 side and is movable. The balance of magnetic flux generated around the contact 35 is lost. More specifically, in FIG. 23B, when a current flows through the movable contact 35 from the back side to the near side of the page, the number of magnetic fluxes that pass through the movable contact 35 from right to left is determined. However, the magnetic flux passing through the movable contact 35 from left to right is increased. Here, the magnetic flux passing through the movable contact 35 from right to left generates a downward electromagnetic force on the movable contact 35. On the other hand, the magnetic flux passing through the movable contact 35 from left to right generates an upward electromagnetic force with respect to the movable contact 35. That is, an upward electromagnetic force acts on the movable contact 35 more greatly than a downward electromagnetic force. Therefore, two upward forces of the pressing force received from the contact pressure spring 71 and the electromagnetic force act on the movable contact 35. Here, the electromagnetic force generated in the movable contact 35 increases as the gap G5 decreases, and the electromagnetic force decreases as the gap G5 increases.

JP 2010-010056

  However, in the above contact device, the gap G5 increases in proportion to the OT amount. Therefore, when the OT amount is increased, the pressing force received from the contact pressure spring 36 increases, but the electromagnetic force by the yoke plate 74 decreases. End up. Therefore, there is a problem that the contact pressure between the contacts cannot be increased efficiently.

  This invention is made | formed in view of the said reason, The objective is to provide the contact apparatus which can raise the contact pressure between contacts efficiently.

  In order to solve the above-described problems, a contact device according to the present invention includes a pair of fixed terminals having a fixed contact, a movable contact having a pair of movable contacts on and away from the pair of fixed contacts, and the fixed contact. A driving means for driving the movable contact so that the movable contact contacts and separates; a container to which the pair of fixed terminals are fixed; and the movable contact fixed to the container between the pair of fixed terminals And a second yoke fixed to the other surface of the movable contact and facing the first yoke through the movable contact.

  Further, in this contact device, the driving means abuts on one surface of the movable contact and biases the movable contact toward the fixed contact, and moves toward the fixed contact of the movable contact. A restricting portion that restricts movement of the movable member, a movable shaft that is movably inserted through an insertion hole formed in the movable contact, and is connected to the restricting portion, and the movable contact is in contact with and away from the fixed contact. And an electromagnet for driving the movable shaft.

  In the contact device, the driving means includes a contact pressure spring that biases the movable contact toward the fixed contact, a holding body that holds the contact pressure spring, and a movable shaft that is coupled to the holding body. And an electromagnet that drives the movable shaft so that the movable contact contacts and separates from the fixed contact, and the holding body abuts on one surface of the movable contact to fix the movable contact It is preferable to have a restricting portion that restricts movement to the contact side.

  Moreover, in this contact device, it is preferable that the movable contactor is formed with a recess for accommodating the restricting portion on one surface.

  As described above, the present invention has an effect of providing a contact device that can efficiently increase the contact pressure between the contacts.

The perspective sectional view of the contact device in Embodiment 1 of the present invention is shown. Sectional drawing of the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in the same as the above is shown. The principal part schematic of the contact apparatus in the same as the above is shown. Sectional drawing of the inner unit of an electromagnetic relay provided with the contact apparatus in the same as the above is shown. The disassembled perspective view of the electromagnetic relay in the same as the above is shown. The external view of the electromagnetic relay in the same as above is shown. The perspective sectional view of the contact device in Embodiment 2 of the present invention is shown. Sectional drawing of the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in the same as the above is shown. The principal part schematic of the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in Embodiment 3 of this invention is shown. The disassembled perspective view of the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in the same as the above is shown. The principal part schematic of the contact apparatus in the same as the above is shown. Sectional drawing in another form of the contact device same as the above is shown. Sectional drawing of the contact apparatus in the same as the above is shown. The cross-sectional perspective view of the contact apparatus in Embodiment 4 of this invention is shown. Sectional drawing of the contact apparatus in the same as the above is shown. Sectional drawing of the contact apparatus in a prior art example is shown. Sectional drawing of the contact apparatus in the same as the above is shown. The principal part schematic of the contact apparatus in the same as the above is shown.

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

(Embodiment 1)
The contact device of this embodiment is demonstrated using FIGS. In the following description, the vertical and horizontal directions in FIG.

  As shown in FIGS. 1 and 2, the contact device of this embodiment includes a contact block 3 including a fixed terminal 33, a movable contact 35, a contact pressure spring 36, and a container (fixed member) 61, and a drive unit ( Drive means) 8 and a yoke body (first yoke) 63.

  As shown in FIG. 2A, the container 61 is formed in a hollow rectangular box shape opened from the lower surface by a heat resistant material such as ceramic. In addition, a pair of through holes 61 a are provided on the upper surface of the container 61 side by side.

  The fixed terminal 33 is formed in a substantially cylindrical shape by a conductive material such as copper, the upper end portion is enlarged in diameter to form a disk-shaped flange portion 33a, and the fixed contact 32 is fixed to the lower end surface. . The fixed contact 32 may be formed integrally with the fixed terminal 33. The lower end side of the fixed terminal 33 is inserted into the through hole 61 a of the container 61 from above and protrudes into the container 61. Subsequently, the fixing terminal 33 is fixed to the container 61 by brazing the flange portion 33a to the peripheral edge portion of the through hole 61a.

  A yoke body 63 is fixed between the pair of fixed terminals 33 inside the upper surface of the container 61. The yoke body 63 is formed in a substantially rectangular parallelepiped shape from a magnetic material such as soft iron, and a recess 63a is formed along the front-rear direction at a substantially center in the left-right direction of the lower surface.

  The movable contact 35 is formed in a substantially rectangular flat plate shape from a conductive material, and the movable contact 34 is fixed to both ends of the upper surface in the longitudinal direction (left-right direction). The movable contact 35 is disposed with the movable contact 34 and the fixed contact 32 facing each other. Further, the movable contact 35 is formed with a substantially rectangular parallelepiped cutout 35a at the center of the front end and the center of the rear end, respectively, and a narrow portion 351 having a smaller width than the left and right ends is formed at the center.

  The contact pressure spring 36 is composed of a coil spring, and is disposed with the axial direction directed in the vertical direction. The upper end of the contact pressure spring 36 is in contact with the approximate center of the lower surface of the movable contact 35. Here, a disk-shaped protrusion 35 c is formed at substantially the center of the lower surface of the movable contact 35, and the protrusion 35 c is fitted into the inner diameter portion of the contact pressure spring 36, thereby positioning the contact pressure spring 36. Has been made.

  The drive unit 8 includes a holding body 81 that holds the movable contact 35 and the contact pressure spring 36, a movable shaft 82 that is connected to the holding body 81, and the electromagnet block 2 that drives the movable shaft 82.

  The holding body 81 includes a substantially rectangular flat plate-like base plate 811, a pair of opposing walls 812 that extend upward from both front and rear ends of the base plate 811 and face each other, and substantially the center of the upper ends of the pair of opposing walls 812. Are formed in a substantially rectangular frame shape in cross section. A movable contact 35 and a contact pressure spring 36 are disposed between the base plate 811 and the restricting portion 813. Here, the lower end of the contact pressure spring 36 abuts on the base plate 811 and is disposed in a compressed state between the base plate 811 and the movable contact 35 to press the movable contact 35 upward.

  Then, the movable contact 35 pressed by the contact pressure spring 36 is restricted from moving upward (on the fixed contact 32 side) when its upper surface comes into contact with the restriction portion 813.

  The movable shaft 82 is formed in the shape of a long round bar, the upper end of which is connected to the approximate center of the base plate 811, and the electromagnet block 2 is connected to the lower end.

  When the movable shaft 82 is moved upward by the electromagnet block 2, the holding body 81 is also moved upward in conjunction with the movement, and the restricting portion 813 is moved into the recess 63 a of the yoke body 63 as shown in FIG. It is stored in. At the same time, the movable contact 35 held by the holding body 81 moves to the fixed terminal 33 side, the movable contact 34 comes into contact with the fixed contact 32, and the contacts are electrically connected, and the movable contact 35 is moved to the yoke body 63. Proximity to. Here, the thickness of the yoke body 63 is set to a thickness substantially equal to the protruding length of the fixed terminal 33 protruding into the container 61.

  Subsequently, when the movable shaft 82 is further moved upward by the electromagnet block 2 after conduction between the contacts, the holding body 81 is also moved further upward in conjunction with the movement. At that time, the movable contact 35 is restricted from moving upward by the movable contact 34 coming into contact with the fixed contact 32, and the position thereof does not change. Therefore, as the holding body 81 moves upward, the distance between the movable contact 35 and the base plate 811 of the holding body 81 becomes narrower, the amount of compression of the contact pressure spring 36 becomes larger, and The pressing force on the movable contact 35 is increased. Hereinafter, the amount of movement of the movable shaft 82 after contact conduction is referred to as an overtravel amount (OT amount). That is, the contact pressure between the contacts increases in proportion to the amount of OT.

  Further, as described with reference to FIG. 23A in the conventional example, generally, when a yoke is not provided in the vicinity of the movable contact 35, the movable contact around the movable contact 35 through which a current flows is provided. Magnetic flux is generated concentrically with the center of the child 35 as the center of the magnetic field. (In FIG. 23, it is assumed that a current flows from the back side to the front side of the page). Here, in FIG. 23A, since the number of magnetic fluxes moving from the right to the left in the movable contact 35 is substantially equal to the number of magnetic fluxes moving from the left to the right in the movable contact 35, the movable contact 35 No electromagnetic force is generated.

  On the other hand, in the contact device of this embodiment, when the contacts are conducted, a magnetic field generated around the movable contact 35 due to the influence of the yoke body 63 close to the upper surface of the movable contact 35 as shown in FIG. Is out of balance. More specifically, the magnetic flux generated around the movable contact 35 is attracted to the yoke body 63 side, and most of the magnetic flux passing through the movable contact 35 from right to left is attracted to the yoke body 63 to move. The number passing through the contact 35 decreases. On the other hand, the number of magnetic fluxes passing through the movable contact 35 from left to right increases. That is, the number of magnetic fluxes that pass through the movable contact 35 from left to right is greater than the number of magnetic fluxes that pass through the movable contact 35 from right to left. Here, the magnetic flux from the right to the left in the movable contact 35 applies a downward electromagnetic force to the movable contact 35, and the magnetic flux from the left to the right in the movable contact 35 is the movable contact 35. An upward electromagnetic force is applied to. Therefore, upward electromagnetic force acts on the movable contact 35. That is, at the time of contact conduction, two upward forces of an upward pressing force received from the contact pressure spring 36 and an upward electromagnetic force by the yoke body 63 act on the movable contact 35.

  In the contact device of this embodiment, since the yoke body 63 is fixed to the container 61 independently of the drive unit 8, the yoke body 63 is moved by the movement of the holding body 81 and the movable shaft 82 in the drive unit 8. Not linked. Therefore, after contact conduction, the distance (gap G1) between the yoke body 63 and the movable contact 35 can be set shorter than before without depending on the amount of OT, and the gap G1 can be kept constant. . That is, even if the amount of OT is increased, the gap G1 does not increase, and the decrease of the upward electromagnetic force by the yoke body 63 acting on the movable contact 35 can be prevented, and the contact pressure between the contacts can be increased efficiently. Can do.

  Further, since the value of the gap G1 can be set independently of the amount of OT, the electromagnetic force is most effective in increasing the contact pressure between the contacts by adjusting the value of the gap G1. Can be easily performed.

  Further, since the upward electromagnetic force can be stably obtained, even if the electromagnet block 2 is made small, the proof strength (contact pressure) against the short-circuit current can be maintained, and the contact device can be downsized. . Thereby, reduction of the power consumption of a contact device and cost reduction can be aimed at.

  Further, in the contact device in the conventional example shown in FIG. 21, the yoke plate 74 is held by the holding body 81 together with the movable contact 35 and the contact pressure spring 36. Here, in order to stably operate the contact device, it is necessary to assemble the movable contact 35, the contact pressure spring 36, and the yoke plate 74 with respect to the holding body 81 with high accuracy.

  On the other hand, in the contact device of this embodiment, the yoke body 63 is provided independently of the drive unit 8, and only the movable contact 35 and the contact pressure spring 36 are held by the holding body 81. The number of parts to be assembled can be reduced as compared with the prior art. Therefore, the assembly becomes easier than the conventional contact device, and the manufacturing cost can be reduced.

  In addition, since the number of components held by the holding body 81 is reduced, the force required when driving the holding body 81 can be reduced. Therefore, the contact pressure can be maintained while suppressing the electromagnetic force generated in the electromagnet block 2, and the electromagnet block 2 can be reduced in size, power saving and cost reduction.

  In the contact device of the present embodiment, the concave portion 63a is formed in the yoke body 63. However, the concave portion 63a is closed even if both the front and rear ends are open as long as the regulating portion 813 can be accommodated. It may be what you did.

  And the contact device of the said embodiment is used for an electromagnetic relay as shown in FIGS.

  The electromagnetic relay accommodates the drive unit 8 having the electromagnet block 2, the contact block 3, the yoke body 63, and the capsule yoke 39 shown in FIG. 5 in the housing 4 shown in FIG. 7. Hereinafter, with reference to the vertical and horizontal directions in FIG.

  As shown in FIGS. 5 and 6, the electromagnet block 2 includes a coil bobbin 21, a pair of coil terminals 23 to which both ends of the excitation winding 22 are connected, and a fixed iron core 24 disposed and fixed in the coil bobbin 21. The movable iron core 25, the yoke 26, and the return spring 27 are provided.

  The coil bobbin 21 is formed in a substantially cylindrical shape with flange portions 21a and 21b formed at the upper and lower ends of a resin material, and an excitation winding 22 is wound around a cylindrical portion 21c between the flange portions 21a and 21b. A substantially disc-shaped recess 21 d is formed in the approximate center of the flange 21 a, and the bottom surface of the recess 21 d communicates with the inner diameter of the coil bobbin 21. Then, a bottomed cylindrical cylindrical member 28 having a flange portion 28a formed at the upper end is inserted into the inner diameter portion of the coil bobbin 21, and the flange portion 28a is housed and fixed in the recess 21d.

  Further, a movable iron core 25 formed from a magnetic material in a substantially columnar shape is disposed in the cylindrical portion 28b of the cylindrical member 28, and further, above the movable iron core 25, from a magnetic material to a substantially columnar shape. A fixed iron core 24 that is formed and faces the movable iron core 25 in the axial direction is disposed. Here, cylindrical concave portions 24 a and 25 a are formed in the approximate center of the lower surface of the fixed iron core 24 and the approximate center of the upper surface of the movable iron core 25, respectively. A return spring 27 comprising a coil spring is disposed between the fixed iron core 24 and the movable iron core 25, the upper end of the return spring 27 abuts on the bottom surface of the recess 24a, and the lower end of the return spring 27 is the recess. It contacts the bottom surface of 25a.

  The movable shaft 82 is movably inserted in the through hole 24b formed in the axial direction in the fixed iron core 24, and is further fitted in the through hole 25b formed in the axial direction in the movable iron core 25. Thus, the movable iron core 25 is connected.

  As shown in FIG. 6 (c), the excitation winding 22 has ends connected to a pair of terminal portions 121 provided on the flange portion 21 a of the coil bobbin 21, and via lead wires 122 connected to the terminal portions 121. Are connected to a pair of coil terminals 23, respectively.

  The coil terminal 23 is made of a conductive material such as copper, and is connected to the lead wire 122 by solder or the like.

  As shown in FIG. 5A, the yoke 26 includes a yoke plate 26A disposed on the upper end side of the coil bobbin 21, a yoke plate 26B disposed on the lower end side of the coil bobbin 21, and the left and right sides of the yoke plate 26B. It is comprised from a pair of yoke plate 26C extended from the both ends to the yoke plate 26A side.

  The yoke plate 26A is formed in a substantially rectangular plate shape, and an insertion hole 26b is formed in the approximate center thereof. Here, a cylindrical fitting protrusion 25c protrudes from the upper end surface of the fixed iron core 24, and the fixed iron core 24 is inserted by inserting the fitting protrusion 25c into the insertion hole 26b. It is fixed to the yoke plate 26A.

  A cylindrical bush 26D made of a magnetic material is fitted into a gap formed between the inner peripheral surface on the lower end side of the coil bobbin 21 and the outer peripheral surface of the cylindrical member 28. The bush 26 </ b> D forms a magnetic circuit together with the yoke plates 26 </ b> A to 26 </ b> C, the fixed iron core 24, and the movable iron core 25.

  Moreover, as shown to Fig.5 (a), the end of the flange 38 is joined to the opening periphery of the container 61 by brazing. The other end of the flange 38 is joined to the first yoke plate 26A by brazing. A capsule yoke 39 is disposed around the container 61 to extinguish the yoke generated between the contacts in a short time.

  The capsule yoke 39 is composed of a pair of rectangular plate-like permanent magnets 391 disposed to face the front and rear surfaces of the container 61, and a pair of holding members 392 for holding the pair of permanent magnets 391. Is done.

  The holding member 392 is made of a magnetic material such as iron, and is formed in a substantially U shape from a pair of side pieces 39a facing each other and a connecting piece 39b connecting between the ends of the pair of side pieces 39a. Yes. And the holding member 392 is each arrange | positioned in the state in which the connection piece 39b was made to oppose on the right and left both sides of the container 61, and has pinched the pair of permanent magnet 391 and the container 61 with a pair of side piece 39a.

  As shown in FIG. 6C, the housing 4 is formed in a substantially rectangular box shape by a resin material, and has a hollow box-type housing main body 41 having an open upper surface, and a hollow box type covering the opening of the housing main body 41. Cover 42.

  The housing main body 41 is formed with substantially triangular projecting pieces 141 on the left and right side walls, and the projecting pieces 141 are formed with insertion holes 141a used for fixing the electromagnetic relay to the mounting surface by screwing. Yes. Further, a step portion 41a is formed at the opening periphery of the upper end side of the housing main body 41, and the outer periphery is smaller than the lower end side. A pair of slits 41b into which the terminal portion 23b of the coil terminal 23 is fitted is formed on the front side of the step portion 41a. Furthermore, a pair of protrusions 41c are juxtaposed in the left-right direction on the rear surface side of the stepped portion 41a.

  The cover 42 is formed in a hollow box shape with an open bottom surface, and a pair of hole portions 42a into which the protrusions 41c of the housing body 41 are fitted when assembled to the housing body 41 are formed on the rear surface. In addition, a rectangular plate-like partition portion 42c is formed at the center of the upper surface of the cover 42 so that the upper surface is divided into two substantially right and left, and a pair of insertion holes through which the fixed terminals 33 are inserted on both left and right sides of the partition portion 42c. 42b is formed.

  Then, as shown in FIG. 6C, when the drive unit 8 and the contact block 3 are housed in the housing 4, a substantially rectangular shape is formed between the flange 21 b at the lower end of the coil bobbin 21 and the bottom surface of the housing body 41. A lower cushion rubber 43 is interposed. Further, between the container 61 and the cover 42, an upper cushion rubber 44 having an insertion hole 44a through which the flange portion 33a of the fixed terminal 33 is inserted is interposed.

  In the electromagnetic relay, when the exciting winding 22 is energized, the movable iron core 25 is attracted to the fixed iron core 24 and moves upward while compressing the return spring 27. Along with this, the movable shaft 82 inserted into the movable iron core 25 moves upward. When the holding body 81 connected to the movable shaft 82 moves upward, the movable contact 35 held by the holding body 81 also moves upward. As a result, the movable contact 34 fixed to the movable contact 35 abuts on the fixed contact 32 and the contacts are conducted.

  In the electromagnetic relay, since the yoke body 63 is fixed to the container 61 independently of the drive unit 8, the yoke body 63 is not interlocked with the movement of the holding body 81 and the movable shaft 82 in the drive unit 8. Therefore, after contact conduction, the distance (gap G1) between the yoke body 63 and the movable contact 35 can be set shorter than before without depending on the amount of OT, and the gap G1 can be kept constant. . That is, even if the amount of OT is increased, the gap G1 does not increase, and the decrease of the upward electromagnetic force by the yoke body 63 acting on the movable contact 35 can be prevented, and the contact pressure between the contacts can be increased efficiently. Can do.

  Further, since the value of the gap G1 can be set independently of the amount of OT, the electromagnetic force is most effective in increasing the contact pressure between the contacts by adjusting the value of the gap G1. Can be easily performed.

  Further, since the electromagnetic force is prevented from decreasing and the electromagnetic force is stably obtained, the proof strength (contact pressure) against the short-circuit current is maintained even if the electromagnet block 2 is made smaller than the conventional one. Therefore, it is possible to reduce the size of the electromagnetic relay.

  Further, in the contact device provided in the conventional electromagnetic relay, the yoke plate 74 is held by the holding body 81 together with the movable contact 35 and the contact pressure spring 36 as shown in FIG. Here, in order to stably operate the contact device, it is necessary to assemble the movable contact 35, the contact pressure spring 36, and the yoke plate 74 with respect to the holding body 81 with high accuracy.

  On the other hand, in the contact device provided in the electromagnetic relay, the yoke body 63 is provided independently of the drive unit 8, and only the movable contact 35 and the contact pressure spring 36 are held by the holding body 81. The number of parts assembled to 81 can be reduced. Therefore, the assembly becomes easier than the conventional contact device, and the manufacturing cost can be reduced.

(Embodiment 2)
The contact device of this embodiment is demonstrated using FIGS. Hereinafter, the description will be made with reference to the vertical and horizontal directions in FIG.

  As shown in FIG. 8, the contact device according to the present embodiment is different from that of the first embodiment only in that a yoke body (second yoke) 64 is interposed between the movable contact 35 and the contact pressure spring 36. It is different from the contact device. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  The yoke body 64 is formed in a substantially U-shape from a substantially rectangular plate-shaped base plate 641 and a pair of extending walls 642 respectively extending upward from both front and rear ends of the base plate 641. The yoke body 64 is fixed to the movable contact 35 in a state where the narrow portion 351 of the movable contact 35 is fitted in the recess 64b formed between the pair of extending walls 642. Further, a substantially disc-shaped protrusion 64 a is formed at the substantially lower center of the base plate 641 in the yoke body 64, and the protrusion 64 a is fitted into the inner diameter portion on the upper end side of the contact pressure spring 36. The pressure spring 36 is positioned. Then, the yoke body 64 is pressed upward by the contact pressure spring 36.

  In the contact device of the present embodiment configured as described above, when the movable shaft 82 is moved upward by the electromagnet block 2 and the holding body 81 is moved upward along with the movement, the yoke body 64 is also moved upward together with the movable contact 35. Moving. Then, as shown in FIGS. 10A and 10B, when the movable contact 34 abuts on the fixed contact 32 and the contacts become conductive, the movable contact 35 is restricted from moving upward by the fixed terminal 33. The upward movement of the yoke body 64 is restricted by the movable contact 35.

  As shown in FIG. 11, a magnetic flux passing through the yoke bodies 63 and 64 is formed by the current flowing through the movable contact 35, and a magnetic attractive force acts between the yoke bodies 63 and 64. Here, in the contact device of this embodiment, since the yoke body 63 is fixed to the container 61, the yoke body 63 is not moved by the magnetic attraction force, and the magnetic attraction force acting on the yoke body 63 is not affected. There is no transmission to the drive unit 8 side. On the other hand, since the yoke body 64 is movable in the vertical direction, it is attracted to the yoke body 63 side (upward) by the magnetic attraction force and presses the movable contact 35 upward (fixed contact 32 side). That is, in the contact device of the present embodiment, an upward force acts only on the movable contact 35 by the magnetic attractive force generated between the yoke bodies 63 and 64, and the contact pressure between the contacts can be increased efficiently. .

  Further, the yoke body 63 is fixed to the container 61, and the yoke body 64 is fixed to the movable contact 35, and after the contact is conducted, the movement toward the fixed contact 32 together with the movable contact 35 is restricted. Therefore, after the contact is turned on, the distance between the yoke bodies 63 and 64 (gap G2) can be kept constant regardless of the amount of OT, and the gap G2 can be set shorter than before, and the contact pressure between the contacts can be set. And the contact pressure can be stabilized.

  Conventionally, there has been a contact device that prevents a decrease in contact pressure between the contacts by a magnetic attractive force acting between the two yokes. In the contact device, both of the two yokes are held by the holding body. It was what has been. Here, in order to stably operate the contact device, it is necessary to assemble the parts to the holding body with high accuracy. Therefore, as the number of parts to be assembled to the holding body increases, the number of manufacturing steps increases and the manufacturing cost increases. Was.

  On the other hand, in the contact device of this embodiment, the yoke body 63 is provided independently of the drive unit 8, and only the movable contact 35, the contact pressure spring 36, and the yoke body 64 are held by the holding body 81. That is, since only one of the two yokes (yoke bodies 63 and 64) (yoke body 64) needs to be assembled to the holding body 81, the number of parts to be assembled to the holding body 81 can be reduced as compared with the conventional case. Therefore, the assembly becomes easier than the conventional contact device, and the manufacturing cost can be reduced.

  Further, in the contact device of the present embodiment, the drive unit 8 is not assembled with a component that applies force to the drive unit 8 due to the magnetic attraction force. Therefore, the electromagnet block 2 does not need to have a proof strength against the magnetic attraction force, and the electromagnet block 2 can be downsized while maintaining the proof strength against a short-circuit current, thereby reducing power consumption and cost. Therefore, the electromagnet block 2 does not need to have a proof strength against the magnetic attraction force, and the electromagnet block 2 can be downsized while maintaining the proof strength against a short-circuit current, thereby reducing power consumption and cost.

  Further, when designing the contact device, the value of the gap G2 can be set independently of the amount of OT. Therefore, by adjusting the value of the gap G2, the magnetic attraction is increased in order to increase the contact pressure between the contacts. It is possible to easily perform a design in which force is most effective.

  Moreover, since the movable contact 35 is common with the existing movable contact, there is no need for additional machining, and an increase in manufacturing cost can be suppressed.

(Embodiment 3)
The contact device of this embodiment will be described with reference to FIGS. Hereinafter, the description will be made with reference to the vertical and horizontal directions in FIG.

  As shown in FIGS. 12 and 13, the contact device of this embodiment is implemented in that yoke bodies 65 and 66 and a movable contact 37 are used instead of the yoke bodies 63 and 64 and the movable contact 35. It is different from the contact device of form 2. Since other configurations are the same as those in the second embodiment, the same reference numerals are given and description thereof is omitted.

  The yoke body 65 is formed in a substantially rectangular parallelepiped shape from a magnetic material such as soft iron and is fixed to the inside of the upper surface of the container 61.

  The yoke body 66 is made of a magnetic material such as soft iron, and includes a base plate 661 having a substantially rectangular plate shape and four extending pieces 662 respectively extending upward from four corners of the base plate 661. In other words, a pair of extending pieces 662 are provided side by side on both front and rear ends of the base plate 661 via a gap 66a, and a pair of extending pieces 662 are provided on both left and right ends of the base plate 661 via a gap 66b. It is installed side by side.

  The movable contact 37 is formed in a substantially rectangular parallelepiped shape that is long in the left-right direction from a conductive material, and a rectangular parallelepiped notch 37a is formed in the front center and the rear surface. That is, the movable contact 37 is formed with a narrow portion 371 having a narrower width than the left and right sides at a substantially central portion in the left-right direction. Further, a concave portion 37b is formed along the front-rear direction at the approximate center of the upper surface of the narrow portion 371.

  The movable contact 37, the yoke body 66, and the contact pressure spring 36 are disposed between the pair of opposing walls 812 of the holding body 81. At this time, the yoke body 66 is fixed to the movable contact 37 in a state in which the extending piece 662 of the yoke body 66 is fitted in the notch 37a of the movable contact 37, and the recess 37b of the movable contact 37, the yoke The gap 66a of the body 66 communicates. The contact pressure spring 36 is disposed in a compressed state between the base plate 811 of the holding body 81 and the base plate 661 of the yoke body 66, and presses the yoke body 66 upward. Here, the substantially disc-shaped protrusion 66 c formed at the center of the lower surface of the base plate 661 is fitted into the inner diameter portion on the upper end side of the contact pressure spring 36, whereby the contact pressure spring 36 is positioned.

  Then, the movable contact 37 moves upward together with the yoke body 66 pressed by the contact pressure spring 36, and the restricting portion 813 of the holding body 81 is accommodated in the recess 37b of the movable contact 37 and the gap 66a of the yoke body 66. . Here, as shown in FIG. 14A, the movable contact 37 is restricted from moving upward when the bottom surface of the concave portion 37 b abuts against the restricting portion 813.

  In the contact device of the present embodiment configured as described above, when the movable shaft 82 moves upward by the electromagnet block 2, the holding body 81 moves upward along with the movement. Then, the yoke body 66 moves upward together with the movable contact 37. Next, as shown in FIG. 15, when the movable contact 34 abuts on the fixed contact 32 and the contacts are electrically connected, the movable contact 37 is restricted from moving upward, and the yoke body 66 is moved to the movable contact. The upward movement is restricted by 37. Therefore, when the movable shaft 82 moves further upward, the interval between the yoke body 66 and the base plate 811 of the holding body 81 is narrowed, the amount of compression of the contact pressure spring 36 is increased, and the pressing force against the movable contact 37 is increased. growing. Here, the restricting portion 813 of the holding body 81 moves upward in the concave portion 37b of the movable contact 37 by the same distance as the OT amount, but the electromagnet is set so that the OT amount is equal to or less than the depth dimension of the concave portion 37b. Block 2 is designed.

  Then, as shown in FIG. 16, a magnetic flux passing through the yoke bodies 65 and 66 is formed by the current flowing through the movable contact 37, and a magnetic attractive force acts between the yoke bodies 65 and 66. Here, in the contact device of the present embodiment, since the yoke body 65 is fixed to the container 61, the yoke body 65 does not move by the magnetic attraction force, but the magnetic attraction force acting on the yoke body 65. Is not transmitted to the drive unit 8 side. On the other hand, since the yoke body 66 is movable in the vertical direction, it is attracted to the yoke body 65 side (upward) by the magnetic attraction force and presses the movable contact 37 upward (fixed contact 32 side). That is, in the contact device of the present embodiment, an upward force acts on the movable contact 37 by the magnetic attractive force generated between the yoke bodies 65 and 66, and the contact pressure between the contacts can be increased efficiently.

  Further, the yoke body 65 is fixed to the container 61, and the yoke body 66 is fixed to the movable contact 37, and after the contact is conducted, the movement to the fixed contact 32 side together with the movable contact 37 is restricted. Therefore, as shown in FIG. 15B, after the contact is made conductive, the distance (gap G3) between the yoke bodies 65 and 66 can be kept constant regardless of the amount of OT, and the gap G3 is made larger than the conventional one. The contact pressure between the contacts can be increased and the contact pressure can be stabilized.

  Conventionally, there has been a contact device that prevents a decrease in contact pressure between the contacts by a magnetic attractive force acting between the two yokes. In the contact device, both of the two yokes are held by the holding body. It was what has been. Here, in order to stably operate the contact device, it is necessary to assemble the parts to the holding body with high accuracy. Therefore, as the number of parts to be assembled to the holding body increases, the number of manufacturing steps increases and the manufacturing cost increases. Was.

  On the other hand, in the contact device of this embodiment, the yoke body 65 is provided independently of the drive unit 8, and only the movable contact 37, the contact pressure spring 36, and the yoke body 66 are held by the holding body 81. That is, since only one (yoke body 66) of the two yokes (yoke bodies 65 and 66) has only to be assembled to the holding body 81, the number of parts to be assembled to the holding body 81 can be reduced as compared with the prior art. Therefore, the assembly becomes easier than the conventional contact device, and the manufacturing cost can be reduced.

  Further, in the contact device of the present embodiment, the drive unit 8 is not assembled with a component that applies force to the drive unit 8 due to the magnetic attraction force. Therefore, the electromagnet block 2 does not need to have a proof strength against the magnetic attraction force, and the electromagnet block 2 can be downsized while maintaining the proof strength against a short-circuit current, thereby reducing power consumption and cost.

  Further, when designing the contact device, the value of the gap G3 can be set independently of the amount of OT. Therefore, by adjusting the value of the gap G3, the magnetic attraction is increased to increase the contact pressure between the contacts. It is possible to easily perform a design in which force is most effective.

  Further, in the contact device of the present embodiment, as shown in FIG. 17, the yoke body 63 used in the first embodiment may be used instead of the yoke body 65. In the above case, the groove (second recess) 63a of the yoke body 63 faces the groove (first recess) 37b of the movable contactor 37 in the vertical direction, and after contact conduction, as shown in FIG. When the lower end of the recess 63a and the upper end of the recess 37b are close to each other, a rectangular moving space S surrounded by the recess 63a and the recess 37b is formed. And the control part 813 moves in the movement space S from the recessed part 37b side to the recessed part 63a side as OT amount becomes large. In this way, by using the yoke body 63 instead of the yoke body 65, the movable distance of the restricting portion 813 can be increased by the depth of the recess 63a, and the OT amount can be set longer and a larger contact can be achieved. It is possible to obtain pressure.

(Embodiment 4)
The contact device of this embodiment will be described with reference to FIGS. Hereinafter, the description will be made with reference to the vertical and horizontal directions in FIG.

  As shown in FIG. 19, the contact device of this embodiment is different from the contact device of Embodiment 1 in that it does not have a holding body 72 and further has a movable shaft 83 instead of the movable shaft 82. ing. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  The movable shaft 83 includes an insertion hole 35b formed substantially at the center of the narrow portion 351 of the movable contact 35, a shaft portion 831 that is movably inserted through the inner diameter portion of the contact pressure spring 36, and an upper end of the shaft portion 831. It is comprised from the substantially rectangular plate-shaped control part 832 formed. The restricting portion 832 abuts on the upper surface of the movable contact 35 and restricts the movement of the movable contact 35 toward the fixed contact 32 (upper side).

  Further, the contact spring 36 has an upper end that contacts the lower surface of the movable contact 35 and a lower end that contacts the yoke plate 26 </ b> A shown in FIG. 5 of the first embodiment, and between the yoke plate and the movable contact 35. It arrange | positions in a compression state and presses the movable contact 35 upward.

  Then, when the movable shaft 83 is moved upward by the electromagnet block 2, the restriction on the movable contact 35 by the restriction portion 832 is released, and the movable contact 35 is moved upward by the pressing force received from the contact pressure spring 36. Move to. Then, the movable contact 34 comes into contact with the fixed contact 32 so that the contacts are electrically connected. At that time, the upper surface of the movable contact 35 is close to the yoke body 63, and the restricting portion 832 is accommodated in the recess 63 a of the yoke body 63.

  In the contact device described above, the distance (gap G4) between the movable contact 35 and the yoke body 63 can be set shorter than the conventional one and the gap G4 is made constant after the contact is turned on regardless of the OT amount of the movable shaft 83. be able to. Therefore, the upward electromagnetic force acting on the movable contact 35 can be increased regardless of the amount of OT, and the electromagnetic force can be stably applied. Therefore, the contact pressure between the contacts can be stabilized and the contact pressure can be increased efficiently.

  Further, when designing the contact device, the value of the gap G4 can be set independently of the amount of OT. Therefore, by adjusting the value of the gap G4, the magnetic attraction is increased to increase the contact pressure between the contacts. It is possible to easily perform a design in which force is most effective.

  In the contact device of the present embodiment, the movable contact 37 shown in the third embodiment may be used instead of using the movable contact 35. When the movable contact 37 is used, the OT amount is set longer. It is possible to increase the contact pressure.

2 Electromagnet block (electromagnet)
3 Contact blocks 82, 83 Movable shaft 8 Drive unit (drive means)
32 fixed contact 33 fixed terminal 34 movable contact 35, 37 movable contact 37b recess (first recess)
36 Contact pressure spring 61 Container (fixing member)
63, 65 Yoke body (first yoke)
63a recess (second recess)
64, 66 Yoke body (second yoke)
81 Holding body 813, 832 Restriction part

Claims (4)

A pair of fixed terminals having fixed contacts;
A movable contact having a pair of movable contacts on and off the pair of fixed contacts,
Driving means for driving the movable contact so that the movable contact is in contact with and away from the fixed contact;
A container to which the pair of fixed terminals are fixed;
A first yoke fixed to the container between the pair of fixed terminals and facing one surface of the movable contact;
A second yoke fixed to the other surface of the movable contact and facing the first yoke via the movable contact;
A contact device. The driving means includes a contact pressure spring that urges the movable contact toward the fixed contact, and a regulating portion that abuts against one surface of the movable contact and restricts the movement of the movable contact toward the fixed contact. A movable shaft that is movably inserted through an insertion hole formed in the movable contact and is connected to the restricting portion, and an electromagnet that drives the movable shaft so that the movable contact contacts and separates from the fixed contact When,
The contact device according to claim 1. The driving means includes a contact pressure spring that urges the movable contact toward the fixed contact, a holding body that holds the contact pressure spring, a movable shaft that is coupled to the holding body, and the movable contact that includes the movable contact. An electromagnet that drives the movable shaft so as to be in contact with and away from the fixed contact,
2. The contact device according to claim 1, wherein the holding body has a restricting portion that abuts on one surface of the movable contact and restricts the movement of the movable contact toward the fixed contact.   The contact device according to claim 2, wherein the movable contact is formed with a recess for accommodating the restricting portion on one surface.

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