JP2014232669A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device capable of preventing grains of contact melt by electric-arc and/or foreign matters from entering gaps between the lines of a contact pressure spring.SOLUTION: A contact device A includes: a fixed contact 111; a movable contactor 12 with a movable contact 121 which comes into/separates away from the fixed contact 111; a coil-like contact pressure spring 16 that gives an elastic force to the movable contactor 12 toward the fixed contact 111 to bring the movable contact 121 into contact with the fixed contact 111; and a protection member 18 disposed to cover the periphery of the contact pressure spring 16. In the contact device A, the protection member 18 disposed to cover the periphery of the contact pressure spring 16 prevents grains of contact melt by electric-arc and/or foreign matters from entering gaps between the lines of the contact pressure spring 16.

Description

  The present invention relates to a contact device.

  Conventionally, a contact device that opens and closes a contact using a coil has been provided (see, for example, Patent Document 1). The contact device includes a movable iron core and a fixed iron core that are arranged opposite to each other in the vertical direction, a coil that applies electromagnetic attraction between the movable iron core and the fixed iron core, and a shaft that is connected to the movable iron core and moves in accordance with the movement of the movable iron core. With.

  The contact device includes a fixed terminal having a fixed contact, a movable contact having a movable contact that comes in contact with and away from the fixed contact, and a fixed terminal disposed on the opposite side of the fixed contact with respect to the movable contact. And a contact pressure spring that applies elastic force to the movable contact to the movable contact. And these fixed contact, a movable contact, and a contact pressure spring are accommodated in the sealing container sealed with the yoke plate and the flange.

JP 2010-257789 A

  In the contact device shown in Patent Document 1 described above, the contact pressure spring is exposed in the sealed container, and contact particles and foreign matters melted by the arc may enter the gap between the contact pressure springs. It was.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a contact device in which contact particles and foreign matter melted by an arc are less likely to enter a gap between contact pressure springs. It is in.

  The contact device of the present invention has a fixed contact, a movable contact having a movable contact that comes in contact with and away from the fixed contact, and an elastic force toward the fixed contact when the movable contact is brought into contact with the fixed contact. A coil-shaped contact pressure spring applied to the contact and a protective member disposed so as to cover the periphery of the contact pressure spring are provided.

  The contact device includes a holding member for holding the contact pressure spring, the protection member is formed in a cylindrical shape having a diameter larger than the outer diameter of the contact pressure spring, and the contact pressure spring held by the holding member is disposed in the cylinder. It is preferably arranged so as to be stored.

  Further, in this contact device, the holding member that holds the contact pressure spring and the movable contact and moves between a closed position where the movable contact is brought into contact with the fixed contact and an open position where the movable contact is separated from the fixed contact. And a driving means for moving the holding member between the closed position and the open position, the holding member having an opening that opens in a direction intersecting the moving direction of the holding member and into which the movable contact enters. It is also preferable that the protective member is arranged so as to close the opening except the moving range of the movable contact.

  In the contact device, the movable contact preferably has a groove portion into which the end of the protective member on the movable contact side enters in a state where the movable contact is in contact with the fixed contact.

  In this contact device, when the movable contact is separated from the fixed contact, the insertion amount of the protective member into the groove is L1, the depth of the groove is D1, and the contact pressure spring is used when the movable contact is brought into contact with the fixed contact. When the distance that the holding member moves against the elastic force is L2, it is also preferable that D1> L1 + L2.

  In this contact device, the protective member is preferably provided integrally with the holding member.

  By arranging the protective member so as to cover the periphery of the contact pressure spring, there is an effect that it is possible to provide a contact device in which the contact particles and foreign matter melted by the arc are less likely to enter the gap between the contact pressure springs. .

It is sectional drawing which shows an example of the contact apparatus of this embodiment. (A) is sectional drawing of the contact block used for the contact apparatus same as the above, (b), (c) is sectional drawing which shows the principal part. (A), (b) is sectional drawing which shows the principal part of the contact block used for another contact device same as the above. (A), (b) is sectional drawing which shows the principal part of the contact block used for another contact device same as the above. It is sectional drawing which shows the principal part of the contact block used for another contact apparatus same as the above. (A) is sectional drawing of the contact block used for another contact apparatus same as the above, (b), (c) is sectional drawing which shows the principal part.

  Hereinafter, an embodiment of a contact device will be described with reference to FIGS. This contact device is used for, for example, an electromagnetic contactor or an electromagnetic relay. In the following description, unless otherwise specified, the vertical and horizontal directions are defined in the orientation shown in FIG.

  FIG. 1 is a cross-sectional view showing an example of a contact device A of the present embodiment, and this contact device A includes an inner unit block 3 configured by integrally combining a contact block 1 and an electromagnet block 2. The container block 3 is accommodated in a case (not shown) formed in a hollow box shape.

  The electromagnet block 2 includes a coil bobbin 21 formed in a hollow cylindrical shape by an insulating material, and an electromagnetic coil 22 formed by winding a conductive wire around the coil bobbin 21. The electromagnet block 2 is fixed to the upper side of the coil bobbin 21 in the cylinder and the lower side of the coil bobbin 21 in the cylinder and contacts the fixed core 23 depending on whether or not the electromagnetic coil 22 is energized. The movable iron core 24 is provided.

  Furthermore, the electromagnet block 2 includes a yoke upper plate 25 and a yoke 26 made of a magnetic metal material, and a return spring 27 that is disposed in the cylinder of the coil bobbin 21 and applies a downward elastic force to the movable iron core 24. The yoke 26 is formed in a U shape by a central piece and both opposing pieces so as to surround the electromagnetic coil 22, and forms a magnetic circuit together with the fixed iron core 23, the movable iron core 24 and the yoke upper plate 25. The electromagnet block 2 employs a conventionally well-known configuration, and detailed description thereof is omitted here. In the present embodiment, the electromagnet block 2 constitutes a driving means.

  The contact block 1 includes a sealing container 13 formed in a hollow box shape having an open bottom surface, a fixed terminal 11 formed in a columnar shape, a movable contact 12 disposed in the sealing container 13, and a fixed terminal. And a contact pressure spring 16 for applying an elastic force to the movable contact 12 to the side 11 (upper side in FIG. 1). The contact block 1 includes a shaft 14 whose lower end is connected to the movable iron core 24 and interlocked with the movement of the movable iron core 24, a holding member 15 that is attached to the tip of the shaft 14 and holds the movable contact 12 and the contact pressure spring 16. Is provided.

  The fixed terminal 11 is formed in a cylindrical shape by a conductive material (for example, copper), and a fixed contact 111 is integrally provided at the tip (lower end in FIG. 1). The fixed contact 111 may be separate from the fixed terminal 11.

  The movable contact 12 is formed of a conductive material (for example, copper) in a rectangular plate shape that is long in the left-right direction, and movable contacts 121, 121 are integrally provided on the upper surface near both ends in the left-right direction. The movable contact 121 may also be a separate body from the movable contact 2.

  The sealing container 13 is formed in a hollow box shape whose lower surface is opened by a heat-resistant material (for example, ceramic), and two holes 131 and 131 for allowing the fixed terminal 11 to pass therethrough are provided side by side in the left-right direction. Yes. Each fixed terminal 11 is passed through the hole 131 in a state in which the flange portion 112 protrudes from the upper surface of the sealing container 13, and is joined to the sealing container 13 by brazing, for example.

  Moreover, one end (upper end in FIG. 1) of the flange 17 is joined to the opening edge of the sealing container 13 by brazing, and the other end (lower end in FIG. 1) of the flange 17 is welded to the yoke. The sealing container 13 is sealed by being joined to the plate 25.

  The shaft 14 is formed of a nonmagnetic material in the shape of a round bar that is long in the vertical direction, and the holding member 15 is attached to the upper end (tip), and the movable iron core 24 is attached to the lower end side.

  The contact pressure spring 16 is formed in a coil shape, and is arranged in a compressed state between the movable contact 12 and the holding member 15 so that the expansion and contraction direction is the vertical direction.

  As shown in FIG. 2, the holding member 15 is a synthetic resin molded product, and has a main body 151 formed in a U shape by a central piece and both opposing pieces. Rectangular openings 151a and 151a are provided at both ends of the main body 151 in the left-right direction (direction intersecting the moving direction of the holding member 15). Further, a projecting part 152 that protrudes upward is provided on the upper surface of the central piece of the main body part 151, and this projecting part 152 has one end side of the contact pressure spring 16 (in FIG. 2A). The lower end side) is fitted.

  Further, the contact pressure spring 16 formed in a cylindrical shape having a diameter larger than the outer diameter of the contact pressure spring 16 on the upper surface of the central piece of the main body portion 151 and fitted in the projecting portion 152 is accommodated in the cylinder. A cylindrical portion 153 arranged in this manner is provided. Here, in the present embodiment, the protection member 18 is configured by the cylindrical portion 153.

  Further, a U-shaped restricting member 19 is attached to the upper portion of the main body 151 so as to straddle both opposing pieces of the main body 151, and the movable contact 12 is moved upward by the restricting member 19. Is regulated.

  Next, the operation of the contact device A will be described. First, when the electromagnetic coil 22 is not energized, the movable iron core 24 is separated from the fixed iron core 23 by the downward elastic force applied from the return spring 27 as shown in FIG. At this time, since the shaft 14 connected to the movable iron core 24 also moves downward, the holding member 15 also moves downward together with the shaft 14, and accordingly each movable contact 121 of the movable contact 12 also corresponds to the corresponding fixed terminal 11. The fixed contact 111 is separated.

  When the electromagnetic coil 22 is energized, the movable iron core 24 is attracted to the fixed iron core 23 and moved upward, and the shaft 14 connected to the movable iron core 24 is also moved upward. Further, since the holding member 15 also moves upward together with the shaft 14, the movable contact 12 also moves to the fixed terminal 11 side (upper side in FIG. 1), and each movable contact 121 of the movable contact 12 corresponds to the corresponding fixed terminal 11. The fixed contact 111 is contacted.

  At this time, the contact pressure of the fixed contact 111 corresponding to each movable contact 121 is increased by the elastic force applied to the movable contact 12 by compressing the contact pressure spring 16. At this time, the contact pressure spring 16 is compressed, so that the gap between the movable contact 12 and the protection member 18 is also reduced.

  When the energization of the electromagnetic coil 22 is stopped, the movable iron core 24 is moved downward by the elastic force applied from the return spring 27, and accordingly, the shaft 14 connected to the movable iron core 24 is also moved downward. Furthermore, since the holding member 15 moves together with the shaft 14, the movable contact 12 also moves downward, and each movable contact 121 of the movable contact 12 is separated from the corresponding fixed contact 111 of the fixed terminal 11.

  In the contact device A of this embodiment, as shown in FIGS. 1 and 2, the protective member 18 is disposed so as to cover the periphery of the contact pressure spring 16. There is an advantage that it becomes difficult to enter the gap between the lines of the pressure spring 16. Moreover, when the protective member 18 is provided integrally with the holding member 15 as in this example, the workability is improved and the work cost can be reduced as compared with the case where the protective member 18 is provided separately.

  FIG. 3 is a cross-sectional view showing a main part of another contact device A of the present embodiment. In addition, since it is the same as that of the contact apparatus A demonstrated in FIG.1 and FIG.2 about components other than the holding member 15 and the protection member 18, description is abbreviate | omitted here.

  The holding member 15 is a synthetic resin molded product, and has a main body 151 formed in a flat rectangular box shape with an upper surface opened as shown in FIGS. 3 (a) and 3 (b). That is, the holding member 15 of this example is provided with side portions 154 and 154 so as to close the openings 151a and 151a of the holding member 15 described in FIG. 2, and in this example, these side portions 154 and 154 are provided. The protective member 18 is configured by 154.

  Further, each side surface portion 154 is set to a height that does not interfere with the movable contact 12 when the movable contact 12 moves downward against the elastic force of the contact pressure spring 16 in the closed state. . That is, each side surface portion 154 is provided so as to close the opening portion 151 a excluding the moving range of the movable contact 12. Note that the operation of the contact device A is the same as that of the contact device A described with reference to FIGS.

  Here, the position of the holding member 15 that brings each movable contact 121 of the movable contact 12 into contact with the fixed contact 111 of the corresponding fixed terminal 11 is a closed position, and each movable contact 121 is separated from the corresponding fixed contact 111. The position of the holding member 15 is the opening position.

  In the contact device A of this example, as shown in FIG. 3, since the side portions 154 and 154 (protective member 18) that close the openings 151a and 151a of the holding member 15 are provided, There is an advantage that the foreign matter is less likely to enter the gap between the lines of the contact pressure spring 16. Moreover, when the protective member 18 is provided integrally with the holding member 15 as in this example, the workability is improved and the work cost can be reduced as compared with the case where the protective member 18 is provided separately.

  FIG. 4 is a cross-sectional view showing a main part of still another contact device A of the present embodiment. In addition, since it is the same as that of the contact apparatus A demonstrated in FIG.1 and FIG.2 about components other than the movable contact 12, description is abbreviate | omitted here.

  The movable contact 12 is formed of a conductive material (for example, copper) in a rectangular plate shape that is long in the left-right direction, and movable contacts 121, 121 are integrally provided on the upper surface near both ends in the left-right direction. In addition, a circular groove 122 into which the upper end portion (end portion on the movable contact 12 side) of the protection member 18 (cylindrical portion 153) enters is provided on the lower surface of the movable contact 12.

  In the contact device A, when the movable contact 121 is separated from the fixed contact 111, the upper end portion of the protection member 18 does not enter the groove portion 122 as shown in FIGS. 4 (a) and 4 (b). . On the other hand, in the state in which the movable contact 121 is in contact with the fixed contact 111, the movable contact 12 moves downward against the elastic force of the contact pressure spring 16, and therefore the illustration is omitted. The upper end enters into the groove 122.

  In the contact device A of the present example, as shown in FIG. 4, the protective member 18 is disposed so as to cover the periphery of the contact pressure spring 16, so that the contact particles and foreign matter melted by the arc are exposed to the contact pressure spring 16. There is an advantage that it becomes difficult to enter the gap between the lines. In this example, the upper end portion of the protection member 18 (cylindrical portion 153) enters the groove portion 122 of the movable contact 12 when the movable contact 121 is in contact with the fixed contact 111. Therefore, as compared with the contact device A described with reference to FIGS. 1 to 3, there is an advantage that the contact particles and foreign matter melted by the arc are less likely to enter the gap between the contact pressure springs 16.

  FIG. 5 is a cross-sectional view showing a main part of still another contact device A of the present embodiment. In the contact device A described with reference to FIG. 4, the upper end portion of the protection member 18 (cylindrical portion 153) enters the groove portion 122 when the movable contact 121 is in contact with the fixed contact 111. On the other hand, in this example, even when the movable contact 121 is separated from the fixed contact 111, the upper end portion of the protection member 18 enters the groove portion 122.

  In the contact device A of this example, as shown in FIG. 5, the insertion amount of the protective member 18 into the groove 122 in the state where the movable contact 121 is separated from the fixed contact 111 is L1, and the depth dimension of the groove 122 (vertical direction) Is D1. Further, when the distance that the holding member 15 moves against the elastic force of the contact pressure spring 16 when the movable contact 121 is brought into contact with the fixed contact 111 is L2, D1, L1, and L2 satisfy D1> L1 + L2. Is set.

  As a result, even when the movable contact 121 is in contact with the fixed contact 111, the upper end of the protection member 18 does not contact the bottom surface of the groove 122 (see the broken line in FIG. 5). A sufficient contact pressure can be applied during 111.

  Further, in the contact device A of this example, the contact pressure spring 16 is always covered with the protective member 18 (cylindrical portion 153), so that the contact particles and foreign matter melted by the arc are the gaps between the contact pressure springs 16. Intrusion can be reliably prevented.

In the contact device A described with reference to FIGS. 1 to 5, the movable contact 12 and the contact pressure spring 16 are held by the holding member 15. For example, as shown in FIG. 6, the movable contact 12 is connected to the shaft 14. You may attach directly to.

  This contact device A has an insulating member 20 formed in a flat box shape with an open top surface, and a cylindrical portion 201 disposed in the center of the bottom surface of the insulating member 20 so that the vertical direction is the axial direction. Are provided integrally. The contact pressure spring 16 is disposed in a compressed state between the movable contact 12 and the insulating member 20 while being accommodated in the cylinder of the cylindrical portion 201. Here, in this example, the holding member 18 is constituted by the cylindrical portion 201.

  In the contact device A of this example, since the contact member 16 (cylindrical portion 201) covers the periphery of the contact pressure spring 16 as in the contact device A described with reference to FIGS. There is an advantage that the particles and foreign matter are less likely to enter the gap between the lines of the contact pressure spring 16. Further, by providing the protection member 18 integrally with the insulating member 20, the workability can be improved and the operation cost can be reduced as compared with the case where the protection member 18 is provided separately.

  Note that the protective member described in the present embodiment is an example, and may have other shapes as long as it is arranged so as to cover the periphery of the contact pressure spring. In this embodiment, the protective member is provided integrally with the holding member, but may be a separate member. Further, in the present embodiment, the driving means is constituted by the electromagnet block, but any means may be used as long as the holding member can be moved in the vertical direction.

  The contact device A includes a fixed contact 111, a movable contact 12, a coiled contact pressure spring 16, and a protection member 18. The movable contact 12 has a movable contact 121 that comes in contact with the fixed contact 111 so as to be able to contact and separate. The contact spring 16 gives the movable contact 12 an elastic force toward the fixed contact 111 when the movable contact 121 is brought into contact with the fixed contact 111. The protection member 18 is disposed so as to cover the periphery of the contact pressure spring 16.

  Further, the contact device A includes a holding member 15 that holds the contact pressure spring 16. The protective member 18 is preferably formed in a cylindrical shape having a diameter larger than the outer diameter of the contact pressure spring 16 and is disposed so that the contact pressure spring 16 held by the holding member 15 is accommodated in the cylinder.

  Further, the contact device A includes a holding member 15 and driving means (electromagnet block 2). The holding member 15 holds the contact pressure spring 16 and the movable contact 12, and is between a closed position where the movable contact 121 is brought into contact with the fixed contact 111 and an open position where the movable contact 121 is separated from the fixed contact 111. Moving. The driving means moves the holding member 15 between the closing position and the opening position. The holding member 15 has an opening 151 a that opens in a direction intersecting the moving direction of the holding member 15 and into which the movable contact 12 enters. The protection member 18 is preferably disposed so as to close the opening 151a excluding the moving range of the movable contact 12.

  The movable contact 12 preferably has a groove 122 into which the end of the protective member 18 on the movable contact 12 side enters when the movable contact 121 is in contact with the fixed contact 111.

  Further, the insertion amount of the protective member 18 into the groove 122 in a state where the movable contact 121 is separated from the fixed contact 111 is L1, and the depth dimension of the groove 122 is D1. Furthermore, the distance that the holding member 15 moves against the elastic force of the contact pressure spring 16 when the movable contact 121 is brought into contact with the fixed contact 111 is L2. In this case, it is preferable that D1> L1 + L2.

  The protective member 18 is preferably provided integrally with the holding member 15.

12 movable contact 16 contact pressure spring 18 protective member 111 fixed contact 121 movable contact A contact device

Claims (6)

A fixed contact;
A movable contact having a movable contact that comes into contact with and separates from the fixed contact;
A coiled contact pressure spring that gives the movable contact an elastic force toward the fixed contact when the movable contact is brought into contact with the fixed contact;
And a protection member arranged to cover the periphery of the contact pressure spring. A holding member for holding the contact pressure spring;
The protective member is formed in a cylindrical shape having a diameter larger than the outer diameter of the contact pressure spring, and is arranged so that the contact pressure spring held by the holding member is accommodated in a cylinder. The contact device according to claim 1. A holding member that holds the contact pressure spring and the movable contact and moves between a closed position where the movable contact contacts the fixed contact and an open position which separates the movable contact from the fixed contact; ,
Drive means for moving the holding member between the closing position and the opening position;
The holding member has an opening that opens in a direction intersecting the moving direction of the holding member and into which the movable contact enters.
The contact device according to claim 1, wherein the protection member is disposed so as to close the opening excluding a moving range of the movable contact.   The said movable contact has the groove part into which the edge part by the side of the said movable contact of the said protection member enters in the state which made the said movable contact contact the said fixed contact. Contact device.   When the movable contact is separated from the fixed contact, the insertion amount of the protective member into the groove is L1, the depth of the groove is D1, and the contact pressure when the movable contact is brought into contact with the fixed contact. 5. The contact device according to claim 4, wherein D1> L1 + L2 is satisfied when the distance that the holding member moves against the elastic force of the spring is L2.   The contact device according to claim 2, wherein the protection member is provided integrally with the holding member.

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