JP2012155877A - Contact arrangement - Google Patents

Abstract

Provided is a contact device that is quiet and can be miniaturized while maintaining a magnetic attractive force.
A fixed terminal 11 having a fixed contact 11a, a movable contact 20 provided with a movable contact 20a, a movable shaft 21 provided with a movable contact 20 on an upper end side, and the movable contact 20 on the fixed contact 11a side. A contact pressure spring that urges the movable shaft 21, a movable iron core 31 fixed to the lower end of the movable shaft 21, a fixed iron core 30 whose lower surface faces the movable iron core 31, and a return that urges the movable iron core 31 downward. A spring 32, a coil bobbin 41 that houses the movable iron core 31 and the fixed iron core 30, a coil 13 wound around the coil bobbin 41, a yoke plate 34 made of a magnetic material through which the fixed iron core 30 is inserted, and the yoke plate 34 And a stopper cap 36 made of a magnetic material having a recess 36c for accommodating the upper end portion of the fixed iron core 30, and an elastic body 51 interposed between the fixed iron core 30 and the recess 36c.
[Selection] Figure 1

Description

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

  Conventionally, there are a fixed contact, a movable contact having a movable contact facing the fixed contact, a movable shaft, a movable iron core, a fixed iron core disposed facing the movable iron core, and a fixed iron core. There is a contact device provided with a fixed portion to be fixed and a substantially cylindrical coil bobbin in which a coil is wound around an outer peripheral surface. Here, the movable contact is provided on one end side of the movable shaft, and the movable contact moves to the fixed contact side with the movement of the movable iron core fixed to the other end of the movable shaft.

  The movable iron core and the fixed iron core are housed in the inner diameter portion of the coil bobbin, and when the coil is energized, a magnetic flux is generated around it, and the movable iron core is attracted to the fixed iron core magnetized by the magnetic flux. The movable iron core moves. With the movement of the movable iron core, the movable contact moves to the fixed contact side, the movable contact contacts the fixed contact, and the contacts become conductive.

  Here, when the movable iron core moves to the fixed iron core side, the movable iron core collides with the fixed iron core to generate vibration, and the vibration is propagated from the fixed iron core to the fixed plate, so that sound waves in the audible range are generated. (Hereinafter referred to as operation sound) may be emitted into the air. Therefore, in order to reduce the operation noise, an elastic member is interposed between the fixed iron core and the fixed plate for fixing the fixed iron core, and the vibration is transmitted to the fixed plate by the elastic member. There has been a contact device that suppresses vibration and reduces the operation noise (see, for example, Patent Document 1).

JP 2006-310248 A

  And also in the said contact device which aimed at reduction of an operation sound as mentioned above, size reduction was desired for the purpose of suppression of installation space. Here, as an example of a method of downsizing the contact device, a method of reducing the coil bobbin is conceivable. However, when the coil bobbin is downsized, the force (magnetic attraction force) that the fixed iron core attracts the movable iron core decreases. However, the contact opening / closing performance may be reduced.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a contact device that is quiet and can be downsized while maintaining a magnetic attractive force.

  In order to solve the above-described problems, a contact device according to the present invention includes a fixed terminal having a fixed contact, a contact block including a movable contact provided with a movable contact contacting and separating from the fixed contact, and the movable contact on one end side. A movable shaft that is fixed to the other end side of the movable shaft, the movable shaft is movably inserted, one end surface faces the movable contact, and the other end surface is the movable iron A fixed iron core facing the core, a return spring that elastically biases the movable iron core in a direction away from the fixed iron core, a coil bobbin in which the movable iron core and the fixed iron core are housed, and the coil bobbin A coil block made of a coil wound around the outer peripheral surface of the coil bobbin, and a joint made of a magnetic material in which one surface is disposed opposite to one end surface of the coil bobbin and an insertion hole through which one end side of the fixed iron core is inserted is formed. Iron plate and the yoke A stopper cap made of a magnetic material, which is disposed opposite to one surface or the other surface and forms a storage portion for storing one end side of the movable iron core together with the yoke plate, and one of the fixed iron cores in the storage portion. A first elastic member interposed between an end face and the stopper cap, wherein the movable iron core is interlocked with the movement of the movable shaft in the axial direction.

  In this contact device, at least one of the fixed iron core and the stopper cap has a gap smaller than the thickness of the elastic member in the axial direction of the shaft portion, and the fixed iron core and the stopper cap. It is preferable that a proximity portion formed between the two is formed.

  Further, in this contact device, the proximity portion is configured by an inner peripheral surface of an insertion hole through which the shaft portion of the fixed iron core is inserted, and an opposing surface of the stopper cap facing the inner peripheral surface. Is preferred.

  Further, in this contact device, at least one of the opposing surfaces of the stopper cap and the first elastic member is formed with a first protrusion that protrudes toward the other. Is preferred.

  In the contact device, a second protrusion that protrudes toward the other is formed on at least one of the surfaces of the fixed iron core and the first elastic member facing each other. It is preferable.

  Further, in this contact device, the fixed iron core has a flange portion that is opposed to the opening periphery of the insertion hole on one end side, and the flange portion and the opening periphery are provided between the flange portion and the opening periphery. It is preferable that a second elastic member sandwiched between the yoke plates is interposed.

  In the contact device, a third protrusion that protrudes toward the other is formed on at least one of the mutually opposing surfaces of the second elastic member and the yoke plate. Is preferred.

  In the contact device, a fourth protrusion that protrudes toward the other is formed on at least one of the mutually opposing surfaces of the second elastic member and the flange. Is preferred.

  In the contact device, it is preferable that the first and second elastic members are integrally formed.

  According to the present invention, there is an effect that it is possible to provide a contact device that is quiet and can be downsized while maintaining a magnetic attractive force.

Sectional drawing of the contact apparatus in Embodiment 1 of this invention is shown. The principal part sectional drawing of the contact apparatus in the same as the above is shown. (A)-(c) shows the impact-absorbing body with which the contact apparatus in the same is provided, (a) is a top view, (b) is a cross-sectional view, and (c) shows a bottom view. The principal part sectional drawing in another form of the contact device in the same as the above is shown. The principal part sectional drawing of another form of the contact device in the same as the above is shown. (A)-(c) shows another form of the shock absorber with which the contact apparatus in the same is provided, (a) is a top view, (b) is a sectional view, and (c) is a bottom view. The principal part sectional drawing in another form of the contact device in the same as the above is shown. Sectional drawing of the principal part of the contact apparatus in Embodiment 2 of this invention is shown.

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

(Embodiment 1)
Hereinafter, a contact device according to a first embodiment of the present invention will be described with reference to the drawings. In the following description, the description will be given with the direction orthogonal to the vertical direction as the front-rear direction with reference to the vertical and horizontal directions in FIG. The contact device X of this embodiment includes a contact block A, a movable shaft 21, a contact pressure spring 22, a stopper cap 36, a movable iron core 31, a fixed iron core 30, a return spring 32, and a yoke plate 34. A joining member 35, a drive block B, and an impact absorber 5.

  The contact block A includes a fixed terminal 11 having a fixed contact 11a, a movable contact 20 having a movable contact 20a that contacts and separates from the fixed contact 11a, and a sealing container 10 that houses the movable contact 20.

  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 10a are provided at two places on the upper bottom portion 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 each through hole 10a.

  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 using a copper-based material or the like, and a pair of movable contacts 20a are fixed to the upper surface of the movable contact 20 at locations facing the pair of fixed contacts 11a. Further, an insertion hole 20 b is formed in the central portion of the movable contact 20.

  The movable shaft 21 includes a rod-shaped shaft portion 211 that is movably inserted through the insertion hole 20b of the movable contact 20, and a disc-shaped flange portion 212 provided at one end of the shaft portion. The movable shaft 21 restricts the movement of the movable contact 20 toward the fixed contact 11 a side when the shaft portion 21 is inserted through the insertion hole 20 b and the flange portion 212 is in contact with the upper surface of the movable contact 20.

  The contact pressure spring 22 is formed of a coil spring, and the shaft portion 21 is inserted into the inner diameter portion thereof. The upper end of the contact pressure spring is in contact with the lower surface of the movable contact 20 and urges the movable contact 20 upward.

  As shown in FIG. 2, the stopper cap 36 is formed of a magnetic material in a substantially truncated cone shape that expands in diameter from the upper end side toward the lower end side, and is depressed upward by closing the upper surface and opening the lower surface. A recess 36c is formed. Further, a substantially annular flange 361 protruding in the radial direction is formed at the opening periphery of the lower end. As shown in FIG. 2, an insertion hole 36a is formed at the center of the bottom surface 360 of the stopper cap 36, and the movable shaft 21 is inserted through the insertion hole 36a. Further, the lower end of the contact pressure spring 22 is brought into contact with the approximate center of the upper surface side of the bottom surface 360. That is, the contact pressure spring 22 is provided between the stopper cap 36 and the movable contact 20 with the movable shaft 31 inserted. In addition, a substantially annular proximity portion 362 that protrudes downward is formed at the periphery of the insertion hole 36a on the bottom surface 360. In addition, in the vicinity of the periphery of the bottom surface 360, a substantially annular projecting wall (first projecting portion) 36b is formed which is substantially coaxial with the insertion hole 36a and projects downward. Here, the protruding wall 36b is formed in a substantially semicircular cross section.

  The fixed iron core 30 is formed in a substantially cylindrical shape from a metal material, and an insertion hole 30a through which the movable shaft 21 is inserted is provided along the axial direction at the approximate center of the cross section. In addition, a flange portion 30 c that protrudes in the radial direction is integrally formed at the upper end portion of the fixed iron core 30. Then, the movable shaft 21 is inserted through the insertion hole 30 a, and the flange portion 30 c is accommodated in the recess 36 c of the stopper cap 36. Moreover, the upper surface of the fixed iron core 30 protrudes upward from the base end of the flange portion 30c to the peripheral edge of the insertion hole 30a, so that an annular proximity portion 301 is formed. The upper surface of the proximity portion 301 faces the lower surface of the proximity portion 362 of the stopper cap 36. Further, a recess 30b having an inner diameter larger than the inner diameter of the insertion hole 30a is formed on the lower end surface of the fixed iron core 30.

  The movable iron core 31 is formed in a substantially cylindrical shape from a magnetic material, and a screw hole 31a into which the shaft portion 211 of the movable shaft 21 is screwed is provided along the axial direction at the approximate center of the cross section. The movable iron core 31 is fixed to the movable shaft 21 by screwing the lower end side of the movable shaft 21 into the screw hole, and the upper surface of the movable iron core 31 faces the lower surface of the fixed iron core 30. Here, as for the movable iron core 31, the outer peripheral surface becomes a sliding surface which slides on the inner peripheral surface of the cylindrical member 33 mentioned later.

  A so-called coil spring is used as the return spring 32, the movable shaft 21 is inserted through the inner diameter portion thereof, one end abuts on the bottom surface of the concave portion 30 b of the fixed iron core 30, and the other end abuts on the top surface of the movable iron core 31. .

The yoke plate 34 is formed in a substantially rectangular plate shape from a magnetic metal material such as iron, and forms a magnetic circuit together with the stopper cap 36, the yoke member 42 described later, the fixed iron core 30, and the movable iron core 31. As shown in FIG. 2, the yoke plate 34 is formed with an insertion hole 34a at the approximate center thereof, and the fixed iron core 30 is inserted into the insertion hole 34a. Further, a substantially annular projecting wall (third projecting portion) 34b is formed upward from the opening periphery of the insertion hole 34a.
And the lower surface of the collar part 361 of the stopper cap 36 is fixed to the upper surface of the yoke plate 34. Thereby, the collar part 30c of the fixed iron core 30 is accommodated between the yoke plate 34 and the stopper cap 36, and the fixed iron core 30 is prevented from coming off by the stopper cap 36.

  Further, around the flange portion 30c, there is provided an impact absorber 5 formed in an approximately bottomed cylindrical shape from an elastic material such as silicon rubber. As shown in FIG. 3, the shock absorber 5 has a disk-like elastic body 51 having an insertion hole 51a formed at the center and an insertion hole 52a coaxial with the insertion hole 51a. The elastic body 52 and the peripheral wall 53 connecting the outer peripheral edges of the elastic bodies 51 and 52 are formed in a substantially cylindrical shape. Here, the diameter of the insertion hole 52a is set larger than that of the insertion hole 51a. A substantially annular projecting wall (first projecting portion) 51b projecting upward is formed from the opening peripheral edge of the insertion hole 51a. Further, a substantially annular projecting wall (third projecting portion) 52b that projects downward is formed from the outer peripheral edge of the elastic body 52. Here, the protruding walls 51b and 52b are formed in a substantially semicircular cross section.

  And the collar part 30c of the fixed iron core 30 is engage | inserted between the elastic bodies 51 and 52 through the insertion hole 52a. Here, the insertion holes 51a and 52a are substantially coaxial with the insertion hole 30a of the fixed iron core 30, and the movable shaft 21 is inserted into the insertion hole 30a. Subsequently, the fixed iron core 30 is inserted into the insertion hole 34 a of the yoke plate 34, the protruding wall 52 b of the shock absorber 5 abuts on the upper surface of the yoke plate 34, and the protruding wall 34 b of the yoke plate 34 is the lower surface of the elastic body 52. Abut.

  Further, the stopper cap 36 is disposed on the upper surface of the yoke plate 34, the flange 361 of the stopper cap 36 is fixed to the upper surface of the yoke plate 34, and the protruding wall 51 b of the shock absorber 5 contacts the bottom surface 360 of the stopper cap 36. The protruding wall 36 b of the stopper cap 36 comes into contact with the upper surface of the elastic body 51.

  As shown in FIG. 1, the cylindrical member 33 is formed in a bottomed cylindrical shape whose upper surface is opened by a nonmagnetic material and whose lower surface is closed, and an annular flange 331 is formed on the periphery of the opening. The cylindrical member 33 accommodates the movable iron core 31 at the lower end side thereof, and accommodates the fixed iron core 30 at the upper end side, and the flange portion 331 is hermetically bonded to the peripheral edge of the insertion hole 34a on the lower surface side of the yoke plate 34. Is done.

  The joining member 35 is formed in a substantially cylindrical shape by a metal material, and a step portion 35a is formed at a substantially center in the axial direction, and the diameter of the other end is larger than that of one end. Further, a substantially disc-shaped flange 35b is formed on the opening periphery on the other end side. One end of the joining member 35 is hermetically joined to the opening end of the sealing container 10, and the flange 35 b is hermetically joined to the peripheral edge of the upper surface of the yoke plate 34. Thereby, the joining member 35 forms an airtight space for accommodating the fixed contact 11 a and the movable contact 20 a, the fixed iron core 30 and the movable iron core 31 together with the sealing container 10 and the cylindrical member 33. Here, a gas mainly composed of hydrogen is hermetically sealed in the hermetic space.

  Next, the drive block B will be described. The drive block B includes a substantially cylindrical coil bobbin 41 and an electromagnet 40 composed of a coil 13 wound around the outer peripheral surface of the coil bobbin 41, and a yoke member made of a magnetic material surrounding the electromagnet 40 together with a yoke plate 34. 42.

  The coil bobbin 41 has flange portions 41a and 41b formed at one end and the other end thereof, and the cylindrical member 33 is inserted through the inner diameter portion thereof. In addition, a concave portion 41c is formed in a substantially disc shape at the approximate center of the flange portion 41a on one end side. And the collar part 41a contact | abuts to the lower surface of the yoke plate 34, and the collar part 331 of the cylindrical member 33 fits in the recessed part 41c.

  The yoke member 42 includes a substantially rectangular plate-shaped center piece 421 and a pair of facing pieces 422 formed substantially perpendicular to the center piece 421 from both ends of the center piece 421 and facing each other. Formed. Further, an insertion hole 42a is formed in the approximate center of the center piece 421, and a cylindrical tubular body 423 is erected from the periphery of the insertion hole 42a. In the yoke member 42, the ends of the pair of opposed pieces 422 are joined to the lower surface of the yoke plate 34, the cylinder 423 is fitted into the inner diameter portion of the coil bobbin 41, and the cylindrical member 33 is inserted into the inner diameter portion of the cylinder 423. Is inserted.

  Hereinafter, the operation of the contact device X of the present embodiment having the above configuration will be described. Before the electromagnet 40 is excited, the movable contact 20a is opposed to the fixed contact 11a in the vertical direction with a predetermined distance (contact gap). When the coil 13 is energized, a magnetic flux is formed around the coil 13, the movable iron core 31 is attracted to the fixed iron core 30 magnetized by the magnetic flux, and the movable iron core 31 is fixed to the fixed iron core 30. It moves to the side (upward) and contacts the lower end of the fixed iron core 30. Here, a part of the magnetic flux passes through the movable iron core 31 → the fixed iron core 30 → the yoke plate 34 → the yoke member 42 (opposing piece 422 → center piece 421 → cylinder 423) in order to the movable iron core 31. It is incident again.

  Further, most of the magnetic flux emitted from the proximity portion 301 of the fixed iron core 30 out of the magnetic flux passing through the fixed iron core 30 is formed in the magnetic path L2 in FIG. 2 because the stopper cap 36 is formed of a magnetic material. As shown, the light enters the proximity portion 362 of the stopper cap 36 from the proximity portion 301. Then, the light enters the yoke plate 34 through the proximity portion 362 → the peripheral wall 363 of the stopper cap 36 → the flange portion 361. That is, in the contact device of the present embodiment, in addition to the magnetic path L1 that is directly incident on the yoke plate 34 from the fixed iron core 30, the magnetic path L2 that is incident on the stopper cap 36 from the fixed iron core 30 through the stopper cap 36 is also formed. Is done.

  Then, with the movement of the movable iron core 31, the movable shaft 21 is moved upward, and the flange portion 212 of the movable shaft 21 is separated from the movable contact 20. Subsequently, the movable contact 20 is moved upward by the urging force of the contact pressure spring 22, and the movable contact 20a contacts the fixed contact 11a.

  Further, when the electromagnet 40 is de-energized, the magnetic attraction force disappears, and the movable iron core 31 is moved downward by the urging force of the return spring 32, and the movable shaft 21 is moved downward along with the movement. The flange portion 212 of the movable shaft 21 presses the upper surface of the movable contact 20. Subsequently, the movable contact 20 is moved downward by the pressing, and the movable contact 20a is separated from the fixed contact 11a.

  In the contact device X of the present embodiment, as described above, the magnetic flux emitted from the upper surface of the fixed iron core 30 also enters the yoke plate 34 through the stopper cap 36 made of a magnetic material. The magnetic flux incident on the iron plate 34 increases. That is, the magnetic flux leakage from the fixed iron core 30 is suppressed, and the magnetic attractive force acting between the fixed iron core 30 and the movable iron core 31 is increased. Therefore, even when the coil bobbin 41 is made small, a magnetic attraction force equal to or higher than that of the conventional contact device can be obtained, and thus the contact device can be reduced in size while maintaining the contact opening / closing performance.

  Further, the gap G1 between the adjacent portions 362 and 301 that protrude in the directions approaching each other is set smaller than the thickness T (see FIG. 2) of the elastic body 51 in the vertical direction. As a result, the magnetic gap between the stopper cap 36 and the fixed iron core 31 is reduced, the leakage magnetic flux can be further reduced, and the magnetic attractive force can be further increased. In the present embodiment, the proximity portion is formed on both the stopper cap 36 and the fixed iron core 31, but, for example, only one of the proximity portions 301 and 362 may be formed ( (See FIG. 4).

  Further, in the present embodiment, the proximity portion 362 is formed closer to the shaft portion 211 side than the elastic body 51. However, instead of forming the proximity portion 362, as shown in FIG. A projecting substantially annular proximity portion 365 may be formed. The proximity portion 365 forms a gap G3 smaller than the thickness T of the elastic body 51 between the proximity portion 365 and the proximity of the upper surface periphery of the flange portion 30c. In this case, the magnetic flux passing through the fixed iron core 30 reaches the yoke plate 34 through the following three paths L1 to L3. The path L1 directly enters the yoke plate 34 from the outer peripheral surface of the fixed iron core 30. Further, the path L2 enters the yoke plate 34 from the substantially upper center of the fixed iron core 30 through the bottom surface 360 (stopper cap 36). Further, the path L3 enters the yoke plate 34 from the flange portion 30c through the proximity portion 365 (stopper cap 36). As described above, even when the proximity portion 365 is formed, the magnetic flux emitted to the outside from the upper surface of the fixed iron core 30 reaches the yoke plate 34 through the stopper cap 36 (path L2, L3) made of a magnetic material. Thus, the leakage magnetic flux from the fixed iron core 30 can be suppressed.

  Further, the vibration generated when the movable iron core 31 collides with the fixed iron core 30 is absorbed by the shock absorber 5, so that the vibration can be prevented from propagating to the stopper cap 36 and the yoke plate 34. Therefore, when the movable iron core 31 collides with the fixed iron core 30, it can suppress that the stopper cap 36 and the yoke plate 34 vibrate, and the vibration sound (henceforth, generated by the stopper cap 36 and the yoke plate 34 vibrating) (Referred to as operation sound) and noise reduction.

  Further, since the shock absorber 5 and the stopper cap 36 are in contact with each other only at the tip portions of the projecting walls 51b and 36b, the contact area between the shock absorber 5 and the stopper cap 36 can be suppressed, and the fixed iron core can be suppressed. The vibration propagating from 30 to the stopper cap 36 via the shock absorber 5 can be further suppressed.

  Further, since the shock absorber 5 and the stopper cap 36 are in contact with each other only at the tip portions of the projecting walls 51b and 36b, even when the relative positional relationship between the shock absorber 5 and the stopper cap 36 is shifted, It is possible to prevent the impact absorbing effect from being lowered by the shock absorber 5 and to stably reduce the operation sound. In the above description, both the projecting walls 51b and 36b are provided. However, only one of the projecting walls 51b and 36b may be provided.

  Similarly, since the shock absorber 5 and the yoke plate 34 abut only at the respective tip portions of the projecting walls 34b and 52b, the contact area between the shock absorber 5 and the yoke plate 34 can be suppressed, and the fixed iron Vibration propagating from the core 30 to the yoke plate 34 via the shock absorber 5 can be further suppressed.

  In addition, since the shock absorber 5 and the yoke plate 34 are in contact with each other only at the tip portions of the projecting walls 34b and 52b, even when the relative positional relationship between the shock absorber 5 and the yoke plate 34 is shifted, It is possible to prevent the impact absorbing effect from being lowered by the shock absorber 5 and to stably reduce the operation sound. In the above description, both the projecting walls 34b and 52b are provided. However, any one of the projecting walls 52b and 34b may be provided.

  Further, as shown in FIG. 5, in the vicinity of the base end of the upper surface and the lower surface of the flange portion 30c, a substantially annular protruding wall (second protruding portion) 30d, a protruding wall (fourth protruding portion) substantially coaxial with the insertion hole 30a. (Projection) 30e may be formed. Further, in the vicinity of the outer peripheral edge of the lower surface of the elastic body 51 and in the vicinity of the outer peripheral edge of the upper surface of the elastic body 52, a substantially annular protruding wall (second protruding portion) 51c and a protruding wall (first protrusion) that are substantially coaxial with the insertion hole 51a. (Four protrusions) 52c may be formed.

  Then, by forming the projecting walls 30d, 30e, 51c, and 52c, the fixed iron core 30 and the elastic body 51 are in contact with each other only at the tip portions of the projecting walls 30d, 30e, 51c, and 52c. Thereby, the contact area of the fixed iron core 30 and the elastic body 51 can be suppressed, and vibration propagating from the fixed core 30 to the stopper cap 36 and the yoke plate 34 via the shock absorber 5 can be further suppressed. .

  Further, since the fixed iron core 30 and the shock absorber 5 are in contact with each other only at the tip portions of the projecting walls 30d, 30e, 51c, and 52c, the relative positional relationship between the shock absorber 5 and the fixed iron core 30. Even if the deviation occurs, it is possible to prevent the shock absorbing effect from being lowered by the shock absorber 5 and to stably reduce the operation sound. In the above description, all of the protruding walls 30d, 30e, 51c, and 52c are formed, but at least one of the protruding walls 30d, 30e, 51c, and 52c may be formed.

Further, the elastic bodies 51 and 52 of the shock absorber 5 are respectively provided with protruding walls 51b and 52b. Instead of forming the protruding walls 51b and 52b, along the radial direction as shown in FIG. The substantially cross-shaped grooves 51d and 52d that are formed and orthogonal to each other may be formed. When the grooves 51d and 52d are formed in the elastic bodies 51 and 2, the contact area between the elastic body 51 and the stopper cap 36 and the contact area between the elastic body 52 and the yoke plate 34 can be reduced. Accordingly, similarly to the case where the projecting walls 51d and 52d are formed on the elastic bodies 51 and 52, the vibration propagated from the fixed iron core 30 to the stopper cap 36 through the elastic body 51, and the elastic body 52 from the fixed iron core 30, respectively. In the present embodiment, the stopper cap 36 is formed in a substantially truncated cone shape, and the yoke plate 34 is formed in a substantially flat plate shape. However, as shown in FIG. 7, the stopper cap 36 may be formed in a substantially flat plate shape, and the iron contact plate 34 may be formed in a substantially truncated cone shape. In this case, the stopper cap 36 is formed in a substantially rectangular plate shape, an insertion hole 36a is formed in the approximate center, and a substantially annular proximity portion 362 that protrudes downward is formed at the periphery of the insertion hole 36a. . Here, the proximity portion 362 faces the upper surface of the fixed iron core 30 via a gap G1 smaller than the thickness T1 of the elastic body 51. Further, the yoke plate 34 is formed in a substantially cylindrical shape with a bottom that is enlarged in diameter from the lower side to the upper side and the lower surface is closed, and a substantially rectangular frame-shaped flange 341 that protrudes in the radial direction is formed on the upper opening periphery. Is formed. The peripheral edge of the stopper cap 36 is fixed to the upper surface of the flange portion 341, the elastic body 51 contacts the lower surface of the stopper cap 36, and the elastic body 52 contacts the bottom surface 342 of the yoke plate 34. Even in the case of the above configuration, the magnetic flux emitted from the upper surface of the fixed iron core 30 enters the yoke plate 34 (the flange portion 341) through the stopper cap 36 made of a magnetic material as indicated by a path L2 in FIG. Thereby, the leakage magnetic flux from the upper surface of the fixed iron core 30 can be suppressed.

(Embodiment 2)
The contact device of this embodiment is demonstrated using FIG. In the contact device according to the present embodiment, the protrusion 364 is formed instead of the proximity portion 362 on the stopper cap 36, and the upper end side of the insertion hole 30a is formed instead of the proximity portion 301 on the fixed iron core 30. Only the point which expanded diameter is different from the contact apparatus X of Embodiment 1. FIG. In addition, about another structure, since it is common with the contact apparatus X, a common code | symbol is attached | subjected and description is abbreviate | omitted.

  The stopper cap 36 has a cylindrical protrusion 364 formed downward from the opening periphery of the insertion hole 36a.

  Further, the fixed iron core 30 is expanded in diameter at the upper end side of the insertion hole 30a to form the expanded diameter portion 30f, and the protrusion 364 is inserted into the expanded diameter portion 30f. And the outer peripheral surface 36d of the protrusion 364 adjoins and opposes the peripheral wall 30g of the enlarged diameter part 30f, and a proximity part is formed. The gap between the outer peripheral surface 36d of the protrusion 364 and the peripheral wall 30g of the enlarged diameter portion 30f is referred to as a gap G2.

  In the contact device of the present embodiment, a part of the magnetic flux generated around the coil 13 is the movable iron core 31 → the fixed iron core 30 → the yoke plate 34 → the yoke member 42 (opposing piece 422 → center piece 421). And enter the movable iron core 31 again. Further, among the magnetic flux passing through the fixed iron core 30, most of the magnetic flux emitted from the upper surface side of the fixed iron core 30 is indicated by a magnetic path L3 in FIG. 8 because the stopper cap 36 is formed of a magnetic material. In this way, the light enters the protrusion 364 from the peripheral wall of the enlarged diameter portion 30f. Then, the light enters the yoke plate 34 through the protrusion 364 → the bottom surface 360 → the peripheral wall 363 → the flange 361. That is, in the contact device of the present embodiment, in addition to the magnetic flux L1 that is directly incident on the yoke plate 34 from the fixed iron core 30, a magnetic path L3 that is incident on the stopper cap 36 from the fixed iron core 30 through the stopper cap 36 is also formed. Is done.

  Therefore, the magnetic flux emitted from the upper surface side of the fixed iron core 30 enters the yoke plate 34 through the stopper cap 36 made of a magnetic material, so that the magnetic flux incident on the yoke plate 34 from the fixed iron core 30 increases. That is, the magnetic flux leakage from the fixed iron core 30 is suppressed, and the magnetic attractive force acting between the fixed iron core 30 and the movable iron core 31 is increased. Therefore, even when the coil bobbin 41 is made small, the magnetic attraction force can be maintained at a predetermined value or more, so that the contact device can be downsized while maintaining the contact opening / closing performance.

  Here, in the contact device according to the first embodiment, the proximity portions 301 and 362 are opposed to each other in the vibration direction of the fixed iron core 30 (vertical direction in FIG. 2), so that the proximity portions 301 and 362 are prevented from contacting each other. In addition, it is necessary to set the gap G1 in consideration of the upward shift of the fixed iron core 30.

  However, in the contact device of the present embodiment, the fixed iron 30 (peripheral wall 30g) and the stopper cap 36 (outer peripheral surface 36d) in a direction (horizontal direction in FIG. 8) orthogonal to the vibration direction (vertical direction) of the fixed iron core 30. Are in close proximity to each other. Therefore, the gap G2 can be set smaller than the gap G1 without considering the upward shift of the fixed iron core 30. Therefore, compared with the contact device of the first embodiment, the magnetic gap between the fixed iron core 30 and the stopper cap 36 can be reduced, the leakage magnetic flux generated in the magnetic gap can be suppressed, and a stronger magnetic attractive force can be obtained. Obtainable. Therefore, the contact device of the present embodiment can be further reduced in size while maintaining the magnetic attractive force.

DESCRIPTION OF SYMBOLS 11 Fixed terminal 11a Fixed contact 13 Coil 20 Movable contact 20a Movable contact 21 Movable shaft 22 Contact pressure spring 30 Fixed iron core 30d, 51c Projection wall (2nd projection)
30e, 52c Projection wall (fourth projection)
30g peripheral wall (inner peripheral surface)
31 movable iron core 32 return spring 34 yoke plates 34b, 52b projecting wall (third projecting portion)
36 Cap (stopper cap)
36b, 51b Projection wall (first projection)
36c Concave part (storage part)
36d Outer peripheral surface (opposite surface)
41 Coil bobbin 42 yoke member 51 elastic body (first elastic member)
52 Elastic body (second elastic member)
301,362 Proximity A Contact Block B Drive Block X Contact Device

Claims (9)

A contact block comprising a fixed terminal having a fixed contact, and a movable contact provided with a movable contact contacting and separating from the fixed contact;
A movable shaft provided with the movable contact on one end side;
A movable iron core fixed to the other end of the movable shaft;
The movable shaft is movably inserted, a fixed iron core whose one end surface faces the movable contact and the other end surface faces the movable iron core,
A return spring that elastically biases the movable iron core in a direction away from the fixed iron core;
A coil block comprising a coil bobbin in which the movable iron core and the fixed iron core are housed, and a coil wound around an outer peripheral surface of the coil bobbin;
A yoke plate made of a magnetic material, one surface of which is disposed opposite to one end surface of the coil bobbin and in which an insertion hole through which one end side of the fixed iron core is inserted,
A stopper cap made of a magnetic material, which is disposed to face one surface or the other surface of the yoke plate and forms a storage portion for storing one end side of the movable iron core together with the yoke plate;
A first elastic member interposed between one end face of the fixed iron core and the stopper cap in the storage portion;
The contact device according to claim 1, wherein the movable iron core is interlocked with the movement of the movable shaft in the axial direction.   A proximity portion that forms a gap between the fixed iron core and the stopper cap in at least one of the fixed iron core and the stopper cap that is smaller than the thickness of the elastic member in the axial direction of the movable shaft. The contact device according to claim 1, wherein the contact device is formed.   The said proximity part is comprised from the internal peripheral surface of the penetration hole which the said movable shaft in the said fixed iron core penetrates, and the opposing surface of the said stopper cap facing the said internal peripheral surface. The contact device described.   The first protrusion that protrudes toward one of the other surfaces of the stopper cap and the first elastic member is formed on at least one of the opposing surfaces. The contact device of any one of thru | or 3.   The second protrusion that protrudes toward one of the other surfaces of the fixed iron core and the first elastic member is formed on at least one of the surfaces. 5. The contact device according to any one of 1 to 4. The fixed iron core is formed with a flange facing the opening periphery of the insertion hole on one end side thereof,
The contact device according to any one of claims 1 to 5, wherein a second elastic member is interposed between the flange and the peripheral edge of the opening.   The third protrusion that protrudes toward one of the other surfaces of the second elastic member and the yoke plate is formed on at least one of the surfaces. The contact device described.   7. A fourth protrusion that protrudes toward the other is formed on at least one of the surfaces of the second elastic member and the flange that face each other. Or the contact device according to 7.   9. The contact device according to claim 6, wherein the first and second elastic members are integrally formed.

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