JP2009230919A - Contact device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact device allowing easy attachment of a shock absorber to a flange of a fixed core. <P>SOLUTION: The contact device includes the shock absorber 5 abutting on an end of the fixed core 30 opposed to a movable contact 20 to absorb shocks exerted when the movable core 31 strikes the fixed core 30. The shock absorber 5 includes a first elastic member 50 covering the upper surface of the flange 30C and having a first through-hole 50a formed through it to insert a movable shaft 21 through the hole and a second elastic member 51 covering the lower surface of the flange 30c and having a second through-hole 51a formed through it to insert the fixed core 30 through the hole and outer peripheral edges of the first and second elastic members 50, 51 are integrated with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a contact device suitable for a power load relay, an electromagnetic switch or the like.

  Conventionally, a so-called normally-open contact device in which the contact is turned off in an initial state is known, and is disclosed in, for example, Patent Document 1. Hereinafter, a conventional example of this type of contact device will be described with reference to the drawings. In the following description, the vertical direction in FIG. 7 is defined as the vertical direction. In this conventional example, as shown in FIG. 7, a pair of fixed terminals 11 having a fixed contact 11 a and a movable contact 20 having a pair of movable contacts 20 a contacting and separating from the fixed contact 11 a are accommodated in a sealing container 10. And a drive block B that drives the movable contact 20 so that the movable contact 20a is brought into and out of contact with the fixed contact 11a.

  The sealing container 10 is formed in a box shape whose one surface is opened by a heat resistant material such as ceramic, and through holes (not shown) are provided at two locations on the upper bottom thereof. A part of the fixed terminal 11 formed in a substantially bottomed cylindrical shape with, for example, a copper-based material or the like is inserted into these through holes. A fixed contact 11a is fixed to the lower end portion of the fixed terminal 11, and a flange portion 11b is provided at the upper end portion. In addition, the fixed terminal 11 is hermetically joined to the sealing container 10 by brazing or the like in the vicinity of the flange 11b with the upper end portion protruding from the sealing container 10.

  A movable contact 20 is disposed below the fixed terminal 11. The movable contact 20 is formed, for example, in a flat plate shape by using a copper-based material or the like, and the movable contact 20a is fixed to both ends with a distance to and away from the fixed contact 11a. An insertion hole 20b is provided in the central portion of the movable contact 20, and the upper end of the movable shaft 21 formed in a substantially round bar shape by an insulating material is inserted into the insertion hole 20b and caulked, whereby the movable shaft 21 is squeezed. A movable contact 20 is coupled. The movable contact 20 is elastically biased in a direction (upward) in which the movable contact 20a contacts the fixed contact 11a by a contact pressure spring 22 described later.

  A fixed iron core 30 is disposed on the upper portion of the movable shaft 21 so as to cover the entire circumference thereof. The fixed iron core 30 is formed in a substantially columnar shape, and an insertion hole 30a through which the movable shaft 21 is inserted is provided along the axial direction at the center of the cross section. A flange portion 30c protruding in the radial direction is formed integrally with the upper end portion of the fixed iron core 30, and the flange portion 30c is fixed to the upper surface of a fixed plate 34 to be described later. The lower end portion of the fixed iron core 30 is inserted into the insertion hole 34a of the fixed plate 34 so as to face the upper end portion of the movable iron core 31 described later, and has an inner diameter larger than the inner diameter of the insertion hole 30a. A recess 30b is provided. Further, a cap 36 for preventing the fixed iron core 30 from coming off is covered with the flange portion 30 c of the fixed iron core 30. The cap 36 is formed into a flat bottomed cylindrical shape by processing a plate-like metal member, and the cap 36 is inserted into the insertion hole 36a provided at the center of the bottom plate with the movable shaft 21 inserted therethrough. Bonded to the top surface.

  A movable iron core 31 is disposed below the movable shaft 21 so as to cover the entire circumference. The movable iron core 31 is formed in a substantially columnar shape, and an insertion hole 31a through which the movable shaft 21 is inserted is provided along the axial direction at the approximate center of the cross section. The movable core 31 has an upper end facing the lower end of the fixed core 30, and a recess 31 b having an inner diameter larger than the inner diameter of the insertion hole 31 a is provided at the lower end. Further, the movable iron core 31 is a sliding surface whose outer peripheral surface slides on an inner peripheral surface of a bottomed cylindrical portion 33 described later.

  A return spring 32 is disposed in the recess 30 b of the fixed iron core 30. The return spring 32 elastically biases the movable iron core 31 in the direction in which the movable contact 20a is separated from the fixed contact 11a, and is composed of a compression coil spring having an inner diameter slightly smaller than the inner diameter of the recess 30b. The return spring 32 is extrapolated to the movable shaft 21 inserted through the insertion hole 30a of the fixed iron core 30, its lower end is fixed to the upper end of the movable iron core 31, and its upper end is fixed to the upper surface of the recess 30b. The The bottomed cylindrical part 33 is formed in a bottomed cylindrical shape with a nonmagnetic material, and houses the movable iron core 31 on the lower bottom part side, and houses the fixed iron core 30 facing the movable iron core 31 on the opening part side.

  The fixed plate 34 is formed in a substantially rectangular shape by a magnetic metal material such as iron, and is connected to a yoke 42 described later to form a magnetic circuit together with the fixed core 30 and the movable core 31. As described above, the fixing plate 34 is provided with the insertion hole 34a through which the upper end of the fixed iron core 30 is fixed before being fixed, and the vicinity of the insertion hole 34a is hermetically joined to the bottomed cylindrical portion 33. . A contact pressure spring 22 made of a compression coil spring is disposed between the fixed plate 34 and the movable contact 20 in a state of being extrapolated to the movable shaft 21, and the movable contact 20a contacts the fixed contact 11a. The movable contact 20 is elastically biased in the direction (upward).

  A joining member 35 is disposed between the sealing container 10 and the fixed plate 34. The joining member 35 is formed in a substantially cylindrical shape from a metal material, and the inner peripheral edge of the opening on the upper end side is located inside the inner peripheral surface of the sealing container 10. An upper end portion of the joining member 35 is hermetically joined to the opening end portion of the sealing container 10, and a lower end portion thereof is hermetically joined to the fixing plate 34. Further, the joining member 35 is bent along the entire circumference of the cylindrical portion, and the opening cross section on the lower end side is formed larger than the opening cross section on the upper end side. The joining member 35 is hermetically joined to the sealing container 10 and the fixed plate 34 described above, thereby forming an airtight space for accommodating the fixed contact 11a, the movable contact 20a, the fixed iron core 30, and the movable iron core 31. The gas mainly composed of hydrogen is hermetically sealed in this hermetic space.

  Next, the drive block B will be described. The drive block B includes a coil 41 formed by winding a coil winding around a coil bobbin 40 and a yoke 42 surrounding the coil 41. The yoke 42 is formed in a substantially U shape with a central piece and both opposing pieces, and a through hole 42a through which the bottomed cylindrical portion 33 is inserted is provided in the central piece. The yoke 42 forms a magnetic circuit together with the fixed iron core 30, the movable iron core 31, and the fixed plate 34.

  The operation of the above-described conventional example will be described below. Before the coil 41 is excited, the movable contact 20a faces the fixed contact 11a with a predetermined distance (contact gap). When the coil 41 is excited, the movable iron core 31 is attracted and moved by the fixed iron core 30, so that the movable shaft 21 is driven as the movable iron core 31 moves, and the movable contact 20 a gradually reduces the contact gap. Eventually, it comes into contact with the fixed contact 11a. When the excitation of the coil 41 is cut off, the movable contact 20 is returned mainly by the urging force of the return spring 32 and displaced in the reverse direction, the movable contact 20a is separated from the fixed contact 11a, and the movable iron core 31 is also predetermined. Return only the distance and return to the original state.

Here, the shock absorber 5 is disposed between the flange 30 c of the fixed iron core 30 and the cap 36. The shock absorber 5 is formed in an approximately disc shape from an elastic material such as silicon rubber, and the movable shaft 21 is inserted into the insertion hole 5a penetrating through the center and is in contact with the upper surface of the flange portion 30c and the lower surface of the cap 36. In this state, it is sandwiched between the collar 30c and the cap 36. Thus, vibration (impact) generated when the movable iron core 31 moved by the excitation of the coil 41 hits the fixed iron core 30 is absorbed by the shock absorber 5, so that it can be transferred to members such as the fixed plate 34 and the yoke 42. It is possible to suppress the propagation of vibrations and reduce operating noise.
JP 2006-310248 A

  By the way, the shock absorber 5 is provided not only on the upper surface of the flange portion 30c of the fixed iron core 30 as in the above-described conventional example, but also provided on the lower surface of the flange portion 30c so that the flange portion 30c is sandwiched between the shock absorbers 5. It is desirable to arrange. That is, as shown in FIGS. 8A and 8B, the first elastic member 50 that covers the upper surface of the flange portion 30c and through which the first insertion hole 50a through which the movable shaft 21 is inserted, It is preferable that the shock absorber 5 is constituted by the second elastic member 51 that covers the lower surface of the portion 30c and through which the second insertion hole 51a through which the fixed iron core 30 is inserted.

  However, in this case, the work of attaching the first elastic member 50 to the upper surface of the flange portion 30c and the second elastic member 51 on the lower surface of the flange portion 30c by inserting the fixed core 30 into the second insertion hole 51a. Since the attachment work is required, there is a problem that the shock absorber 5 cannot be easily attached to the fixed iron core 30.

  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 easily attaching an impact absorber to a flange portion of a fixed iron core.

  In order to achieve the above object, the invention according to claim 1 includes a fixed terminal having a fixed contact portion, a contact block including a movable contact portion having a movable contact portion contacting and separating from the fixed contact portion, and a movable contact A movable shaft fixed to one end side, a movable iron core fixed to the other end of the movable shaft, a fixed iron core with the movable shaft extrapolated to face the movable iron core, and a magnet between the fixed iron core and the movable iron core A drive block that generates a suction force to move the movable iron core in a direction that hits the fixed iron core, and an impact absorber that abuts against the end of the fixed iron core that faces the movable contact and absorbs the shock when the movable iron hits the fixed iron core The fixed iron core is provided with a flange that protrudes in the radial direction at one end facing the movable contact, and the shock absorber covers one end in the thickness direction of the flange and inserts the movable shaft. The first insertion hole was penetrated 1 and a second elastic member that covers the other end side in the thickness direction of the collar portion and that has a second insertion hole through which the fixed core is inserted. The first elastic member and the second elastic member The outer peripheral edges of the elastic members are integrally formed with each other.

  The invention of claim 2 is characterized in that, in the invention of claim 1, at least one of the first insertion hole and the second insertion hole is provided with a notch communicating with the insertion hole. .

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the outer surfaces of the first elastic member and the second elastic member have one or a plurality of convex portions or ridge portions protruding in the thickness direction of the ridge portion. One or a plurality of recesses recessed in the thickness direction are provided.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the outer surface of the first elastic member is provided with a first peripheral wall portion that protrudes in the thickness direction of the flange portion and covers the entire circumference of the first insertion hole. The second elastic member is characterized in that a second peripheral wall portion is provided on the outer surface of the second elastic member so as to protrude in the thickness direction of the collar portion and cover the entire circumference of the second insertion hole.

  According to the first aspect of the invention, since the shock absorber in which the first elastic member and the second elastic member are integrally formed is attached to the flange portion of the fixed iron core, the first elastic member is provided as in the conventional example. And the second elastic member do not need to be individually attached to the flange portion of the fixed core, and therefore the shock absorber can be easily attached to the flange portion of the fixed iron core. In addition, since the first elastic member and the second elastic member that are difficult to grasp individually are formed integrally, they can be easily grasped.

  According to the second aspect of the present invention, the resistance at the time of attaching the shock absorber to the flange portion of the fixed core can be reduced by communicating with the insertion hole and cutting out a part of the fixed core. It can be more easily attached to the buttocks. Further, the use of the material can be reduced by providing the notch, and the manufacturing cost can be reduced.

  According to the invention of claim 3, by providing a convex portion or a concave portion on the outer surface of each elastic member, it is possible to reduce the contact area with the member that comes into contact with the shock absorber, and the vibration that propagates to the outside is reduced. The operation sound of the contact device can be further reduced.

  According to the invention of claim 4, foreign matters such as consumable powder generated due to the contact and separation between the fixed contact portion and the movable contact portion enter the inside of the apparatus by providing the convex portion covering the entire circumference of each insertion hole. Can be prevented, and the reliability of the switching operation of the contact device can be improved.

(Embodiment 1)
Hereinafter, a contact device according to a first embodiment of the present invention will be described with reference to the drawings. However, since the basic configuration of this embodiment is the same as that of the conventional example, common portions are denoted by the same reference numerals and description thereof is omitted. In the following description, the top and bottom in FIG. In the present embodiment, as in the conventional example, a contact block A including a fixed terminal 11 having a fixed contact 11a and a movable contact 20 having a movable contact 20a contacting and separating from the fixed contact 11a, and a movable contact 20 are provided. A movable shaft 21 fixed to the upper end portion, a movable iron core 31 fixed to the lower end portion of the movable shaft 21, and the movable shaft 21 is extrapolated so as to face the movable iron core 31 and project radially from the upper end portion. And a drive block B that generates a magnetic attractive force between the fixed iron core 30 and the movable iron core 31 to move the movable iron core 31 in a direction that contacts the fixed iron core 30 (FIG. 7). The shock absorber 5 shown in FIGS. 1A and 1B is attached to the collar portion 30c.

  In this embodiment, the fixed contact 11a made of a contact material fixed to the lower end portion of the fixed terminal 11 is the fixed contact portion. However, the lower end portion of the fixed terminal 11 is fixed to the fixed contact without providing the fixed contact 11a. It does not matter as part. In this embodiment, the movable contact 20a made of a contact material fixed to a portion where the fixed contact 11a contacts and separates in the movable contact 20 is a movable contact portion, but the movable contact 20a is fixed to the portion. Alternatively, the movable contact portion may be used.

  The shock absorber 5 is made of an elastic material such as silicon rubber, for example, and as shown in FIGS. 1A and 1B, the first insertion hole 50a that covers the upper surface of the flange 30c and through which the movable shaft 21 is inserted. And a second elastic member 51 that covers the lower surface of the flange portion 30c and has a second insertion hole 51a through which the fixed iron core 30 is inserted. The outer peripheral edges of the first elastic member 50 and the second elastic member 51 are integrally formed with each other. In addition, the 1st elastic member 50 and the 2nd elastic member 51 are integrally formed so that the space of the thickness dimension substantially equal to the thickness dimension of the collar part 30c may be formed in the meantime.

  As shown in FIGS. 2A and 2B, the shock absorber 5 has a peripheral edge of the second insertion hole 51a so that the diameter of the second insertion hole 51a is larger than the diameter of the flange 30c. Are extended so as to extend in the radial direction, and the flange portion 30c is inserted into the second insertion hole 51a so that the flange portion 30c is sandwiched between the first elastic member 50 and the second elastic member 51. Thus, since the shock absorber 5 in which the first elastic member 50 and the second elastic member 51 are integrally formed is attached to the collar portion 30c, the first elastic member 50 and the second elastic member 50 are attached to the flange portion 30c. There is no need to attach the elastic member 51 separately to the flange 30c, and therefore the shock absorber 5 can be easily attached to the flange 30c. Further, since the first elastic member 50 and the second elastic member 51 that are difficult to grasp individually are integrally formed, the shock absorber 5 can be easily grasped.

  Note that, as shown in FIGS. 3A and 3B, the second elastic member 51 may be provided with a notch 51b having a substantially semicircular cross section that communicates with the second insertion hole 51a. In this case, the periphery of the second insertion hole 51a can be easily extended by extending in the radial direction, that is, the resistance when the shock absorber 5 is attached to the flange portion 30c can be reduced. It can be more easily attached to 30c. Further, by providing the notch 51b, the amount of material used can be reduced, and the manufacturing cost can be reduced. Of course, the shape of the notch 51b is not necessarily limited to the above-described one. For example, as shown in FIGS. 3C and 3D, the notch 51b may be extended to the side surface of the shock absorber 5. I do not care. 3 (e) and 3 (f), the second elastic member 51 is provided with a notch 51b having a substantially rectangular cross section, and the first elastic member 50 is also provided with a first insertion hole 50a. A cutout 50b having a substantially rectangular cross section may be provided so that the cutouts 50b and 51b communicate with each other.

(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 this embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. In the following description, the vertical direction in FIG. 4A is defined as the vertical direction. In the present embodiment, as shown in FIGS. 4A to 4C, a plurality (four in the drawing) of convex portions 50 c projecting upward on the upper surface of the first elastic member 50 extends in the circumferential direction. In addition to projecting, a plurality (four in the figure) of convex portions 51 c projecting downward from the lower surface of the second elastic member 51 are projected in the circumferential direction.

  Here, in the state in which the shock absorber 5 is attached to the flange portion 30c, as shown in FIG. 4D, the first elastic member 50 is in contact with the cap 36 only at the tip of the convex portion 50c, and the second Since only the tip of the convex portion 51c of the elastic member 51 is in contact with the fixed plate 34, the first elastic member 50 and the second elastic member 51 are respectively in contact with the cap 36 and the fixed plate 34 as in the first embodiment. The contact area can be reduced as compared with the case where the contact is made at. Thus, the vibration generated when the movable iron core 31 hits the fixed iron core 30 propagates to the cap 36 and the fixed plate 34 only through the convex portions 50c and 51c, so that the vibration propagating to the outside is reduced and the contact is made. The operation sound of the apparatus can be further reduced.

  As shown in FIGS. 5A to 5C, the upper surface of the first elastic member 50 is provided with a plurality (four in the drawing) of recesses 50d that are recessed downward along the radial direction. On the lower surface of the second elastic member 51, a plurality (four in the drawing) of recesses 51d that are recessed upward in the radial direction may be provided. Even in this case, the operation sound of the contact device can be reduced as described above.

(Embodiment 3)
Hereinafter, a third embodiment of the contact device according to the present invention will be described with reference to the drawings. However, since the basic configuration of this embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted. In the following description, the vertical direction in FIG. 6A is defined as the vertical direction. In the present embodiment, as shown in FIGS. 6A to 6C, the upper surface of the first elastic member 50 protrudes upward and has a substantially annular shape covering the entire circumference of the first insertion hole 50 a. The first peripheral wall portion 50e is provided so as to protrude from the lower surface of the second elastic member 51 so as to protrude downward and to cover the entire circumference of the second insertion hole 51a. Has been established.

  Here, in a state where the shock absorber 5 is attached to the flange portion 30c, as shown in FIG. 6D, the tip end portion of the first peripheral wall portion 50e contacts the cap 36, and the second peripheral wall portion 51e When the tip end abuts on the fixed plate 34, the gap between the cap 36 and the first elastic member 50 along the circumferential direction of the insertion hole 30 a of the fixed core 30 is filled, and the insertion hole 34 a of the fixed plate 34 is also formed. A gap between the fixing plate 34 and the second elastic member 51 along the circumferential direction is filled.

  Thus, foreign matter 6 such as consumable powder generated due to contact and separation between the fixed contact 11a and the movable contact 20a enters the movable core 31 through the insertion hole 30a of the fixed core 30 and the insertion hole 34a of the fixed plate 34. Can be blocked by the first peripheral wall portion 50e and the second peripheral wall portion 51e, so that the reliability of the switching operation of the contact device can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of the contact device which concerns on this invention, (a) is sectional drawing of an impact absorber, (b) It is the top view which looked at the impact absorber from the lower side. It is a figure which shows the attachment method of an impact absorber same as the above, (a) is principal part sectional drawing which shows the state before attachment, (b) is principal part sectional drawing which shows the state after attachment. (A)-(f) is a figure which shows the case where a notch is provided in the shock absorber same as the above. It is a figure which shows Embodiment 2 of the contact apparatus which concerns on this invention, (a)-(c) is the schematic of a shock absorber, (d) is principal part sectional drawing which shows the state which attached the shock absorber. is there. (A)-(c) is a figure which shows the case where a several recessed part is provided in the shock absorber same as the above. It is a figure which shows Embodiment 3 of the contact apparatus which concerns on this invention, (a)-(c) is the schematic of a shock absorber, (d) is principal part sectional drawing which shows the state which attached the shock absorber. is there. It is sectional drawing which shows the conventional contact apparatus. It is a figure which shows the case where the shock absorber same as the above is attached to the both sides in the thickness direction of the collar part of a fixed iron core, (a) is principal part sectional drawing which shows the state before attaching a shock absorber, (b) is shock absorption. It is principal part sectional drawing which shows the state after attaching a body.

Explanation of symbols

11 Fixed terminal 11a Fixed contact (fixed contact)
20 Movable contact 20a Movable contact (movable contact)
21 movable shaft 30 fixed iron core 30c collar 31 movable iron core 5 shock absorber 50 first elastic member 50a first insertion hole 51 second elastic member 51a second insertion hole A contact block B drive block

Claims (4)

  A fixed terminal having a fixed contact portion, a contact block having a movable contact having a movable contact portion contacting and separating from the fixed contact portion, a movable shaft to which the movable contact is fixed on one end side, and the other end of the movable shaft The movable core is fixed to the side, the movable core is extrapolated, the fixed core facing the movable core, and a magnetic attraction force is generated between the fixed core and the movable core to move the movable core in the direction that hits the fixed core. And a shock absorber that abuts against the end of the fixed iron core facing the movable contact and absorbs an impact when the movable iron hits the fixed iron core, and the fixed iron core faces the movable contact A first elastic member provided with a flange projecting in the radial direction at one end, the shock absorber covering one end in the thickness direction of the flange and having a first insertion hole through which the movable shaft is inserted. And the other end in the thickness direction of the buttocks And a second elastic member having a second insertion hole through which the fixed iron core is inserted, and the outer peripheral edges of the first elastic member and the second elastic member are formed integrally with each other. Characteristic contact device.   The contact device according to claim 1, wherein at least one of the first insertion hole and the second insertion hole is provided with a notch communicating with the insertion hole.   The outer surfaces of the first elastic member and the second elastic member were provided with one or more protrusions protruding in the thickness direction of the flange or one or more recesses recessed in the thickness direction of the flange. The contact device according to claim 1 or 2. The outer surface of the first elastic member is provided with a first peripheral wall portion that protrudes in the thickness direction of the flange portion and covers the entire circumference of the first insertion hole, and the outer surface of the second elastic member is provided with an The contact device according to claim 1, wherein a second peripheral wall portion that protrudes in a thickness direction of the portion and covers the entire circumference of the second insertion hole is provided.

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