JP2018198117A - Electromagnetic relay - Google Patents

Abstract

To provide an electromagnetic relay capable of further improving heat radiation efficiency.SOLUTION: An electromagnetic relay 1 comprises: a drive part 30 which opens/closes a contact part 40; and a case 20 in which the drive part 30 is accommodated. A first space S1 is formed between the case 20 and the drive part 30. In the first space S1, a heat radiation member 50 is disposed for radiating heat that is generated in the drive part 30, to the outside of the case 20.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an electromagnetic relay.

  Conventionally, as an electromagnetic relay, a drive unit that opens and closes a contact part is housed in a case, and heat generated when the drive unit is driven is released to the outside through the case. (For example, refer to Patent Document 1).

Japanese Patent Application Laid-Open No. 2014-130771

  Even in the configuration of Patent Document 1, it is possible to release the heat generated when the drive unit is driven from the case to the outside, but the heat generated when the drive unit is driven is more efficiently generated. It is preferable to be able to release to the outside.

  Then, an object of this invention is to obtain the electromagnetic relay which can improve heat dissipation efficiency more.

  The electromagnetic relay of the present invention includes a drive unit that opens and closes a contact part, and a case in which the drive unit is accommodated. A first gap is formed between the case and the drive unit. In the first gap, a heat radiating member that releases heat generated in the driving unit to the outside of the case is disposed.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic relay which can improve heat dissipation efficiency can be obtained.

It is a perspective view showing an electromagnetic relay concerning one embodiment of the present invention. It is a disassembled perspective view which shows the electromagnetic relay concerning one Embodiment of this invention. It is a disassembled perspective view which shows the contact device concerning one Embodiment of this invention. It is a disassembled perspective view which shows a part of contact apparatus concerning one Embodiment of this invention. It is a sectional side view of the electromagnetic relay concerning one Embodiment of this invention, Comprising: It is the sectional side view which cut | disconnected the electromagnetic relay in the state which turned off the contact in the surface containing the left-right direction. It is a sectional side view of the electromagnetic relay concerning one Embodiment of this invention, Comprising: It is the sectional side view which cut | disconnected the electromagnetic relay in the state which turned on the contact in the surface containing the left-right direction. It is a sectional side view of the electromagnetic relay concerning one Embodiment of this invention, Comprising: It is the sectional side view which cut | disconnected the electromagnetic relay in the state which turned off the contact in the surface containing the front-back direction. It is a sectional side view of the electromagnetic relay concerning one Embodiment of this invention, Comprising: It is the sectional side view which cut | disconnected the electromagnetic relay in the state which turned on the contact including the front-back direction. It is a horizontal sectional view of an electromagnetic relay concerning one embodiment of the present invention. It is a perspective view explaining the arrangement | positioning state to the drive part of the heat radiating member concerning one Embodiment of this invention. It is a figure which shows the heat radiating member concerning one Embodiment of this invention, Comprising: (a) is a front view, (b) is a top view, (c) is a back view, (d) is a side view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the upper, lower, left, and right sides in FIG.

  As shown in FIG. 1 and FIG. 2, the electromagnetic relay 1 according to the present embodiment includes a case 20 formed in a hollow box shape from a resin material. In the internal space of the case 20, a contact device 10 configured by integrally combining a drive block (drive unit) 30 positioned at the lower portion and a contact block (contact portion) 40 positioned at the upper portion is housed. ing. Thus, in this embodiment, the contact device 10 is mounted by housing the contact device 10 having the contact block 40 and the drive block 30 for opening and closing the contact block 40 in the internal space of the case 20. The electromagnetic relay 1 is formed. The electromagnetic relay 1 according to the present embodiment is a so-called normally open type in which the contact is turned off in the initial state, but a so-called normally closed type electromagnetic relay in which the contact is turned on in the initial state can also be used. .

  The case 20 includes a substantially box-shaped case main body 21 that opens upward, and a case cover 22 that covers the opening of the case main body 21. Mounted components such as the drive block 30 and the contact block 40 are accommodated in the internal space of the case 20 formed with the case cover 22 attached to the case body 21. In the present embodiment, the drive block 30 is accommodated in the internal space formed by the case body 21 in the internal space of the case 20, and the contact block 40 is accommodated in the internal space formed by the case cover 22. .

  In the present embodiment, the contact block 40 that is slightly smaller than the drive block 30 (the yoke upper plate 351 described later) is disposed on the upper portion of the drive block 30 (the upper portion of the yoke 350 described later), thereby allowing the contact A device 10 is formed. That is, the contact device 10 has a step shape in which the entire circumference of the upper surface outer periphery of the yoke upper plate 351 is a step surface. The outer shape of the case 20 that accommodates the contact device 10 is also stepped along the outer shape of the contact device 10.

  In the present embodiment, as shown in FIG. 1 and the like, a part of the contact block 40 (the upper end of a fixed terminal 420 described later) is exposed from the case 20. However, the method of accommodating the contact device 10 in the case 20 is not limited to this, and for example, the entire contact block 40 may be accommodated in the case 20. In this case, of the components constituting the contact block 40, the components excluding the bus bar (conductive member) connected to an external load or the like are accommodated in the case 20. Further, the entire contact block 40 may be disposed outside the case 20. As described above, at least the drive block 30 may be accommodated in the outer case 20.

  The drive block 30 includes a coil unit 310. The coil unit 310 includes a coil 330 that generates a magnetic flux when energized, and a hollow cylindrical coil bobbin 320 around which the coil 330 is wound.

  Although not shown, a pair of coil terminals to which both ends of the coil 330 are connected are fixed to the coil bobbin 320, and the drive block 30 is energized by energizing the coil 330 through the pair of coil terminals. It is designed to be driven. Then, by driving the drive block 30, a contact constituted by fixed contacts 421a and 421A and movable contacts 430a and 430a of a contact block 40 to be described later is opened and closed, and conduction between the pair of fixed terminals 420 and 420 is established. The non-conduction can be switched.

  The coil bobbin 320 is made of a resin which is an insulating material, and an insertion hole 320a penetrating in the vertical direction is formed at the center of the coil bobbin 320. The coil bobbin 320 includes a substantially cylindrical winding body 321 around which the coil 330 is wound. Further, the coil bobbin 320 is connected to the lower end of the winding drum portion 321, and is connected to the substantially circular lower flange portion 322 protruding outward in the radial direction of the winding drum portion 321 and the upper end of the winding drum portion 321. A substantially circular upper flange portion 323 protruding outward in the radial direction of the winding drum portion 321.

  The drive block 30 includes a yoke 350 disposed around the coil 330 (coil portion 310). The yoke 350 can be formed using, for example, a magnetic material. And the yoke 350 is arrange | positioned so that the coil bobbin 320 may be surrounded in this embodiment. The yoke 350 includes a rectangular yoke upper plate 351 disposed on the upper end surface side of the coil bobbin 320, and a rectangular yoke body 352 disposed on the lower end surface side and the side surface side of the coil bobbin 320. ing.

  The yoke body 352 is disposed between the coil 330 and the case 20. In the present embodiment, the yoke main body 352 includes a bottom wall 353 and a pair of side walls 354 and 354 that rise from left and right edges (peripheries) of the bottom wall 353, respectively, and are opened in the front-rear direction and upward. ing. Note that the bottom wall 353 and the pair of side walls 354 and 354 can be formed integrally by bending a single plate. Further, in the present embodiment, an annular insertion hole 353a is formed in the bottom wall 353 of the yoke main body 352, and a cylindrical inner wall 355 is formed at the periphery of the insertion hole 353a in the bottom wall 353. It is integrally formed. The inner wall 355 can also be formed using, for example, a magnetic material. The inner wall 355 can be formed of a member different from the yoke body 352.

  And the yoke upper board 351 mentioned above so that the coil 330 wound around the upper end surface of the coil bobbin 320 and the coil bobbin 320 may be covered in the front end side (upper end side) of a pair of side wall 354,354 of the yoke main body 352. Has been placed.

  Specifically, notch-shaped recesses 354a and 354a are formed in the center portion in the width direction (front-rear direction) of the upper ends of the pair of side walls 354 and 354, and the longitudinal direction (left-right direction) of the yoke upper plate 351 is formed. Projections 351b and 351b are formed at the center in the width direction (front-rear direction) of both ends. And the yoke upper board 351 is arrange | positioned at the upper end side of the yoke main body 352 by fitting the protrusions 351b and 351b of the yoke upper board 351 into the recesses 354a and 354a of the pair of side walls 354 and 354, respectively. I am doing so. By doing so, the periphery (upper, lower and left and right sides) of the coil part 310 is covered with the yoke 350.

  Further, the drive block 30 includes a fixed iron core (fixed side member) 360 that is inserted into the inside of the cylinder of the coil bobbin 320 (in the insertion hole 320a) and is magnetized by the energized coil 330 (the magnetic flux passes). . Further, the drive block 30 has a movable iron core (movable side member) 370 that faces the fixed iron core 360 in the vertical direction (axial direction) and is disposed inside the cylinder of the coil bobbin 320 (in the insertion hole 320a). I have.

  In the present embodiment, the fixed iron core 360 includes a cylindrical portion 361 that is inserted into the inside of the cylinder of the coil bobbin 320 (in the insertion hole 320a), and a flange portion 362 that protrudes radially outward from the upper end of the cylindrical portion 361. ing. The fixed iron core 360 is formed with an insertion hole 360a into which the shaft 380 and the return spring 302 are inserted.

  In the present embodiment, a protrusion 363 that protrudes toward the inner side (radially inner side) of the insertion hole 360a is formed on the upper end of the cylindrical portion 361 over the entire circumference. That is, in the insertion hole 360a, the opening diameter in the portion where the protrusion 363 is formed is smaller than the opening diameter in the other part (below the protrusion 363). The opening diameter of the insertion hole 360a in the portion where the protrusion 363 is formed is substantially the same as the diameter of the shaft main body 381.

  On the other hand, the movable iron core 370 is formed in a substantially cylindrical shape, and an insertion hole 370 a into which the shaft 380 is inserted is formed at the center of the movable iron core 370. The insertion hole 370 a has a substantially constant opening diameter (an opening diameter substantially the same as the diameter of the shaft main body 381), and the lower end communicates with a recess 371 formed at the lower center of the movable iron core 370. ing.

  The shaft 380 can be formed using, for example, a nonmagnetic material. In the present embodiment, the shaft 380 has a round bar-like shaft main body 381 that is long in the moving direction (vertical direction: drive axis direction) of the movable iron core 370 and a substantially protruding outward in the radial direction from the upper end of the shaft main body 381. A disc-shaped flange portion 382.

  And the movable iron core 370 and the shaft 380 are connected by inserting the lower end side of the shaft main-body part 381 into the insertion hole 370a of the movable iron core 370 from the upper side.

  Further, in the present embodiment, the drive block 30 includes a plunger cap 390 formed in a bottomed cylindrical shape having an upper opening. The plunger cap 390 can also be formed using, for example, a nonmagnetic material. The plunger cap 390 is disposed between the fixed iron core 360 and the coil bobbin 320 and between the movable iron core 370 and the coil bobbin 320.

  In the present embodiment, the plunger cap 390 includes a bottomed cylindrical main body portion 391 that opens upward, and a flange portion 392 that protrudes radially outward from the upper end of the main body portion 391. And the main-body part 391 of the plunger cap 390 is arrange | positioned in the penetration hole 320a formed in the center of the coil bobbin 320. FIG. Further, an annular seat surface 323 a is formed on the upper side (upper flange portion 323) of the coil bobbin 320. And when the main-body part 391 of the plunger cap 390 is arrange | positioned in the insertion hole 320a of the coil bobbin 320, the flange part 392 of the plunger cap 390 is mounted in this seat surface 323a.

  Further, the cylindrical portion 361 of the fixed iron core 360 and the movable iron core 370 are accommodated in the accommodating space 390a of the plunger cap 390 provided inside the cylinder of the coil bobbin 320 (in the insertion hole 320a). In the present embodiment, the fixed iron core 360 is disposed on the opening side of the plunger cap 390, and the movable iron core 370 is disposed below the fixed iron core 360 in the cylinder of the plunger cap 390. Yes.

  Furthermore, the cylindrical portion 361 and the movable iron core 370 of the fixed iron core 360 are each formed in a cylindrical shape whose outer diameter is substantially the same as the inner diameter of the plunger cap 390. The movable iron core 370 slides in the vertical direction (reciprocating direction: drive shaft direction) in the accommodation space 390a of the plunger cap 390.

  In the present embodiment, the flange portion 392 formed on the opening side of the plunger cap 390 is fixed around the insertion hole 351 a on the lower surface of the yoke upper plate 351. The bottom end of the plunger cap 390 is inserted through an inner wall 355 formed at the peripheral edge of the insertion hole 353a of the bottom wall 353.

  By doing so, the movable iron core 370 housed in the lower portion of the plunger cap 390 is magnetically joined to the peripheral portion of the inner wall 355. That is, in this embodiment, the inner side wall 355 also forms a magnetic circuit together with the outer peripheral portion of the yoke 350 (the yoke upper plate 351, the bottom wall 353 and the pair of side walls 354 and 354), the fixed iron core 360, and the movable iron core 370. Try to form.

  Further, an insertion hole 351a through which the fixed iron core 360 is inserted penetrates the central portion of the yoke upper plate 351. When the fixed iron core 360 is inserted, the cylindrical portion 361 of the fixed iron core 360 is inserted. Is inserted from the upper surface side of the yoke upper plate 351. At this time, a concave portion 351c is provided at the approximate center of the upper surface of the yoke upper plate 351, and the flange portion 362 of the fixed iron core 360 is placed in the concave portion 351c.

  When the movable iron core 370 is attracted to the fixed iron core 360 by energizing the coil 330, the shaft 380 connected and fixed to the movable iron core 370 is also moved upward together with the movable iron core 370. ing.

  In this embodiment, the movable range (movable range) of the movable iron core 370 includes an initial position that is spaced apart from the fixed iron core 360 by a gap D1 and a contact position that contacts the fixed iron core 360. Is set between. In the present embodiment, when the drive block 30 is assembled, the state in which the movable iron core 370 is farthest from the fixed iron core 360 is the initial position, and the movable iron core 370 is closest to the fixed iron core 360. The contact position is the state where the position is reached.

  Further, as described above, between the fixed iron core 360 and the movable iron core 370, the direction in which the movable iron core 370 is returned to the initial position by the elastic force (the direction in which the movable iron core 370 is separated from the fixed iron core 360). A return spring 302 is disposed to bias the spring. In the present embodiment, the return spring 302 is configured by a coil spring that is disposed in the insertion hole 360a of the fixed iron core 360 in a state where the periphery of the shaft 380 is wound. The return spring 302 has an upper end in contact with the lower surface 363 a of the protrusion 363 of the fixed iron core 360 and a lower end in contact with the upper surface 372 of the movable iron core 370. That is, the lower surface 363 a of the protrusion 363 and the upper surface 372 of the movable iron core 370 serve as a spring receiving portion of the return spring 302.

  With the above configuration, when the coil 330 is energized, the fixed iron core 360 is opposed to the movable iron core 370 (lower surface) 364 and the movable iron core 370 is opposed to the fixed iron core 360 ( The upper surface 372 has a different polarity from each other as a pair of magnetic pole portions. Then, the movable iron core 370 is attracted to the fixed iron core 360 and moves toward the contact position. As described above, in this embodiment, when the coil 330 is energized, the fixed iron core 360 is opposed to the movable iron core 370 (lower surface) 364 and the movable iron core 370 is opposed to the fixed iron core 360 (upper surface). Each of 372 functions as a magnetic pole surface.

  On the other hand, when energization of the coil 330 is stopped, the movable iron core 370 returns to the initial position by the urging force of the return spring 302.

  As described above, the movable iron core 370 according to the present embodiment is disposed so as to face the fixed iron core 360 via the gap D1 when the coil 330 is not energized, and on the fixed iron core 360 side when the coil 330 is energized. It reciprocates so as to be sucked.

  As the movable iron core 370 reciprocates in the vertical direction, the shaft 380 reciprocates in the vertical direction. Further, as the shaft 380 reciprocates in the vertical direction, the movable contact 430 moves relative to the pair of fixed terminals 420 and 420. Thus, in the present embodiment, the shaft 380 corresponds to a drive shaft that moves the movable contact 430 relative to the pair of fixed terminals 420 and 420 by reciprocating in the vertical direction (one direction). .

  Further, a contact block 40 that opens and closes a contact in response to turning on / off of the coil 330 is provided above the drive block 30.

  The contact block 40 includes a base 410 formed in a box shape opened downward by a heat resistant material such as ceramic. The base 410 includes a top wall 411 and a substantially square cylindrical peripheral wall 412 extending downward from the peripheral edge of the top wall 411.

  The top wall 411 of the base 410 is provided with two insertion holes 411a and 411a arranged in the left-right direction. A pair of fixed terminals 420 and 420 are inserted through the two insertion holes 411a and 411a, respectively.

  The fixed terminal 420 is made of a conductive material such as a copper-based material, and is arranged so as to be elongated in the vertical direction in the state shown in FIG. In the present embodiment, the fixed terminal 420 includes a substantially columnar fixed terminal body 421 (a fixed terminal body 421 elongated in the vertical direction) inserted through the insertion hole 411a from above. The bottom surface of the fixed terminal main body 421 serves as a fixed contact 421a with which the movable contact 430 contacts when the coil 330 is energized. A fixed contact may be provided on the bottom surface of the fixed terminal body 421 separately from the fixed terminal body 421. The fixed terminal 420 includes a flange portion 422 that protrudes radially outward from the upper end of the fixed terminal main body 421 and is fixed to the upper surface of the top wall 411 (the upper surface of the peripheral edge of the insertion hole 411a). The fixed terminal 420 is fixed to the top wall 411 by hermetically joining the flange portion 422 to the top surface of the top wall 411. In the present embodiment, the fixed terminal 420 is fixed to the top wall 411 in a state where the longitudinal direction is substantially aligned with the vertical direction, but the longitudinal direction of the fixed terminal 420 needs to be approximately aligned with the vertical direction. There is no.

  As described above, in this embodiment, the pair of fixed terminals 420 and 420 are fixed (arranged) to the top wall 411 in a state of being separated from each other. Then, with the fixed terminal 420 fixed to the top wall 411, the upper side and the lower side of the fixed terminal 420 are partitioned by the top wall 411.

  In the present embodiment, two insertion holes 22 a and 22 a are provided in the top wall of the case cover 22 so as to be aligned in the left-right direction. The flange portions 422 and 422 of the pair of fixed terminals 420 and 420 are inserted into the insertion holes 22a and 22a, respectively, and the upper ends of the flange portions 422 and 422 are exposed to the outside of the case cover 22. .

  Although not shown, a bus bar (conductive member) connected to an external load or the like is attached to a portion exposed to the outside of the pair of fixed terminals 420 and 420. As this bus bar, for example, a flat plate formed using a conductive material can be used.

  In the base 410, a substantially rectangular plate-shaped movable contact 430 moves relative to the pair of fixed terminals 420, 420 as the shaft (drive shaft) 380 moves in the vertical direction (one direction). Arranged to be able to. The movable contact 430 includes a movable contact main body 430b that is disposed so as to straddle between the pair of fixed contacts 421a and 421a. In addition, movable contacts 430a and 430a are provided at portions facing the fixed contacts 421a and 421a on the upper surface of the movable contact body 430b, respectively. In the present embodiment, the movable contact 430a is formed separately from the movable contact main body 430b, but the upper surface of the movable contact main body 430b (the surface facing the fixed contacts 421a and 421a) is movable contact 430a. It is good.

  Further, an insertion hole 430 c through which one end of a shaft (drive shaft) 380 that connects the movable contact 430 to the movable iron core 370 is inserted is provided at the center of the movable contact 430. The movable contact 430 is attached to a shaft (drive shaft) 380 so that the movable contact 430a is disposed to face the fixed contact 421a with a predetermined interval when the coil 330 is not energized. When the coil 330 is energized, the movable contact 430 moves upward together with the movable iron core 370 and the shaft 380 so that the movable contact 430a contacts the fixed contact 421a.

  Thus, in this embodiment, when the movable iron core 370 is in the initial position, the positional relationship between the movable iron core 370 and the movable contact 430 is set so that the movable contact 430a and the fixed contact 421a are separated from each other. doing. When the movable iron core 370 moves toward the contact position and the movable iron core 370 is slightly in front of the contact position or the contact position (lower side), the movable contact 430a and the fixed contact 421a are The positional relationship between the movable iron core 370 and the movable contact 430 is set so as to come into contact. Therefore, when the coil 330 is not energized, the contact block 40 is turned off to insulate between the fixed terminals 420 and 420, and during the period when the coil 330 is energized, the contact block 40 is turned on. Thus, the fixed terminals 420 and 420 are electrically connected.

  As described above, in the present embodiment, the movable contact 430 is moved relative to the pair of fixed terminals 420 and 420 as the shaft (drive shaft) 380 moves in the vertical direction (one direction). The conduction and non-conduction between the terminals 420 and 420 are switched.

  The contact pressure between the movable contact 430a and the fixed contact 421a is ensured by the contact pressure spring 401. The contact pressure spring 401 is constituted by a coil spring, and is disposed in a state where the axial direction is directed in the vertical direction. In the present embodiment, the contact pressure spring 401 has an upper end in contact with the lower surface 430 d of the movable contact 430 and a lower end in contact with the upper surface 365 of the fixed iron core 360. Is biased upward.

  In the contact device 10 having such a configuration, the shaft 380 can be attached to the movable iron core 370 as follows, for example.

  First, the movable iron core 370, the return spring 302, the yoke upper plate 351, the fixed iron core 360, the contact pressure spring 401, and the movable contact 430 are arranged in this order from the lower side. At this time, it is preferable that the return spring 302 is inserted into the insertion hole 360 a of the fixed iron core 360.

  Then, the main body portion 381 of the shaft 380 is inserted into the insertion holes 430 c, 360 a, 351 a, the contact pressure spring 401 and the return spring 302 from the upper side of the movable contact 430, and is inserted into the insertion hole 370 a of the movable iron core 370. Connect. By doing so, the lower end portion of the shaft 380 is attached to the movable iron core 370.

  In this embodiment, the shaft 380 is connected to the movable iron core 370 by press-fitting the shaft 380 into the insertion hole 370a of the movable iron core 370, as shown in FIGS. However, the shaft 380 may be connected to the movable iron core 370 using other methods. For example, the shaft 380 may be connected to the movable iron core 370 by crushing with the tip protruding into the recess 371 and rivet-bonding. Alternatively, the shaft 380 may be connected to the movable iron core 370 by forming a thread groove on the other end of the shaft 380 and screwing the screw groove to the movable iron core 370.

  Further, in the present embodiment, in order to suppress an arc generated between the movable contact 430a and the fixed contact 421a when the movable contact 430a is separated from the fixed contact 421a, a gas is sealed in the base 410. Yes. As such a gas, it is possible to use a mixed gas mainly composed of hydrogen gas, which is most excellent in heat conduction in a temperature region where an arc is generated. In order to seal this gas, in this embodiment, an upper flange 480 that covers the gap between the base 410 and the yoke upper plate 341 is provided.

  Specifically, as described above, the base 410 includes a top wall 411 in which a pair of insertion holes 411a and 411a are provided side by side, and a rectangular cylindrical peripheral wall 412 that extends downward from the periphery of the top wall 411. And is formed in a hollow box shape in which the lower side (drive block 30 side) is opened. The base 410 is fixed to the yoke upper plate 341 via the upper flange 480 in a state where the movable contact 430 is accommodated inside the peripheral wall 412 from the opened lower side.

  At this time, the peripheral edge of the opening on the lower surface of the base 410 and the upper surface of the upper flange 480 are hermetically joined by silver solder or the like, and the lower surface of the upper flange 480 and the upper surface of the yoke upper plate 341 are hermetically joined by arc welding or the like. Is preferred. Furthermore, it is preferable that the lower surface of the yoke upper plate 341 and the flange portion 392 of the plunger cap 390 be hermetically joined by arc welding or the like. By doing so, a sealed space S in which gas is sealed can be formed in the base 410.

  Furthermore, in parallel with the arc suppression method using gas, in this embodiment, arc suppression using the capsule yoke block 450 is also performed. The capsule yoke block 450 includes a capsule yoke 451 and a pair of permanent magnets 452 and 452. The capsule yoke 451 is formed in a substantially U shape by a magnetic material such as iron. The capsule yoke 451 is integrally formed with a pair of side pieces 451a and 451a that oppose each other and a connecting piece 451b that connects the base ends of the side pieces 451a and 451a.

  The permanent magnets 452 and 452 are attached to both side pieces 451a and 451a of the capsule yoke 451 so as to face the side pieces 451a and 451a, respectively. The permanent magnet 452 applies a magnetic field substantially perpendicular to the moving direction (vertical direction) of the shaft (drive shaft) 380 to the base 410. As a result, the arc is stretched in a direction orthogonal to the moving direction of the shaft (drive shaft) 380, and is cooled by the gas enclosed in the base 410, so that the arc voltage rises rapidly and the arc voltage is increased between the contacts. When the voltage is exceeded, the arc is interrupted. That is, in the electromagnetic relay 1 of this embodiment, an arc countermeasure is taken by magnetic blow by the capsule yoke block 450 and cooling by the gas sealed in the base 410. By doing so, the arc can be interrupted in a short time, and the consumption of the movable contact 430 and the fixed terminals 420 and 420 can be reduced.

  Next, the operation of the electromagnetic relay 1 (contact device 10: drive block 30 and contact block 40) will be described.

  First, when the coil 330 is not energized, the movable iron core 370 is moved away from the fixed iron core 360 by the elastic force (elastic restoring force) of the return spring 302. That is, the movable contact 430 is in the state shown in FIGS. 5 and 7 separated from the pair of fixed terminals 420 and 420. At this time, the movable contact 430 is biased upward by the contact pressure spring 401, but upward movement is restricted by the flange portion 382 of the shaft 380.

  When the coil 330 is energized from this OFF state, the movable iron core 370 is attracted to the fixed member (fixed iron core 360) against the elastic force (elastic restoring force) of the return spring 302 by electromagnetic force. , It moves so as to approach the fixed side member (upward). As the movable iron core 370 moves upward, the shaft 380 and the movable contact 430 also move upward. When the movable contact 430 moves upward, the pair of movable contacts 430a and 430a come into contact with the pair of fixed contacts 421a and 421a, respectively. In this way, the pair of fixed terminals 420 and 420 are electrically conducted, and the electromagnetic relay 1 (contact device 10) is turned on (see FIGS. 6 and 8).

  In the present embodiment, even when the movable contact 430 is in contact with the pair of fixed terminals 420 and 420, a force that moves the shaft 380 upward works. Therefore, the shaft 360 moves relatively upward with respect to the movable contact 430 that contacts the pair of fixed terminals 420 and 420.

  On the other hand, when the energization to the coil 330 is stopped, the movable iron core 370 is returned to the initial position by the urging force (elastic restoring force) of the return spring 302. That is, the movable iron core 370 moves downward. As the movable iron core 370 moves downward, the shaft 380 and the movable contact 430 also move downward. Then, when the movable contact 430 moves downward, the pair of movable contacts 430a and 430a are separated from the pair of fixed contacts 421a and 421a, respectively. Thus, the pair of fixed terminals 420 and 420 are electrically insulated, and the electromagnetic relay 1 (contact device 10) is turned off (see FIGS. 5 and 7).

  By the way, when the coil 330 is energized, a current flows through the coil 330. Thus, when a current flows through the coil 330, the coil 330 generates heat and the temperature of the coil 330 rises. In order to suppress the temperature rise due to the current of the coil 330, it is preferable to more efficiently release the heat generated when the coil 330 is energized to the outside of the case 20.

  Therefore, in this embodiment, the heat dissipation efficiency of the electromagnetic relay 1 can be further improved.

  As described above, the electromagnetic relay 1 is formed by housing the contact device 10 in the internal space of the case 20. Specifically, first, the contact device 10 is arranged so that the drive block 30 of the contact device 10 is accommodated in the internal space of the case body 21. At this time, the contact block 40 is disposed above the upper opening of the case main body 21. In this state, the case cover 22 is attached to the case body 21 so as to cover the contact block 40. By doing so, the electromagnetic relay 1 on which the contact device 10 is mounted is formed.

  At this time, a first gap S <b> 1 is formed between the case body 21 (case 20) and the drive block (drive unit) 30. That is, the first gap S <b> 1 is formed between the case body 21 and the drive block 30 in a state where the drive block 30 is housed in the internal space of the case body 21. By doing so, the drive block 30 can be more easily accommodated in the internal space of the case body 21.

  In this embodiment, the heat dissipation member 50 is disposed in the first gap S <b> 1 formed when the drive block 30 is accommodated in the internal space of the case body 21. Thus, by disposing the heat radiating member 50 in the first gap S1, heat generated in the drive block 30 is transmitted to the heat radiating member 50 and can be released from the heat radiating member 50 to the outside of the case 20. .

  In this embodiment, the heat radiating member 50 has a shape obtained by bending a substantially plate-like member as shown in FIG. 11, and has a thermal conductivity higher than that of air such as copper or aluminum existing in the first gap S1. Is formed using a high metal. That is, the heat radiating member 50 is formed using a metal heat radiating plate.

  The heat radiating member 50 includes a driving side heat radiating portion (driving side heat radiating member) 51 whose inner surface 51 a faces the drive block 30. In the present embodiment, the drive-side heat radiating portion 51 has an inner surface 51 a that is wound around the coil bobbin 320 of the coil 330 when viewed radially from the central axis C of the coil bobbin 320. Are arranged to face each other.

  Furthermore, in this embodiment, when viewed in the radial direction from the central axis C of the coil bobbin 320, the inner surface 51a of the drive side heat radiating portion 51 interposes a pair of side walls 354, 354 of the yoke body 352 (the yoke 350). Without making it, it is made to oppose the outer surface 331a of the winding part 331.

  In the present embodiment, as described above, the pair of substantially plate-like side walls 354 and 354 are arranged on both sides in the left-right direction of the winding portion 331 (coil portion 310), and the winding portion 331 (coil portion 310). Both sides in the front-rear direction are exposed without being covered with the yoke 350 in a side view. Therefore, in the present embodiment, the outer surface 331a exposed without being covered by the yoke 350 is disposed in a side view by disposing the pair of heat dissipation members 50 and 50 on both sides in the front-rear direction of the winding portion 331 (coil portion 310). So as to be covered with a pair of heat dissipating members 50 (see FIG. 10).

  Specifically, when the outer surface 331a of the winding part 331 is viewed in the radial direction from the central axis C of the coil bobbin 320, the outer region 331a is opposed to the opposing region R1 facing the side wall 354 (the yoke 350) and the side wall 354 (the yoke 350). ) And a non-opposing region R2 that does not oppose (see FIG. 9). Then, when viewed in the radial direction from the central axis C of the coil bobbin 320, the inner surface 51a of the drive side heat radiating portion 51 is opposed to only the asymmetric region R2 of the opposed region R1 and the non-opposed region R2.

  At this time, as shown in FIG. 9, the entire surface of the non-facing region R <b> 2 of the outer surface 331 a faces the inner surface 51 a of the drive side heat radiating portion 51. That is, when viewed in the radial direction from the central axis C of the coil bobbin 320, the entire non-facing region R2 of the outer surface 331a overlaps with the inner surface 51a of the drive-side heat radiation portion 51. In this way, the entire outer surface 331 a of the winding part 331 is covered with only one member of the side wall 354 and the drive side heat radiating part 51.

  In this embodiment, as shown in FIGS. 7 and 8, the drive-side heat radiating portion 51 has a vertical direction upper end (upper surface of the yoke upper plate 351) to a lower end (lower surface of the bottom wall 352). It is provided to extend to.

  Furthermore, in the present embodiment, the second heat-dissipating member 50 is disposed between the case main body 21 (case 20) and the drive-side heat dissipating portion 51 (heat dissipating member 50) in a side view when the heat dissipating member 50 is disposed in the first gap S1. A gap S2 is formed. That is, the drive side heat radiating portion 51 is arranged in the first gap S <b> 1 in a state of being separated from the side wall of the case main body 21.

  Specifically, the driving side heat radiating portion 51 is separated from the case main body 21 by fixing the driving side heat radiating portion 51 (heat radiating member 50) with the potting resin (potting material) 60 accommodated in the first gap S1. In the state, it is arranged in the first gap S1. That is, the potting resin 60 is poured into the gap between the case main body 21 and the drive block 30 in the state where the drive side heat radiating portion 51 (heat radiating member 50) is arranged in the first gap S1 so as not to contact the case main body 21 and solidified. By doing so, the drive side heat radiating part 51 is arranged in the first gap S <b> 1 in a state of being separated from the case main body 21. At this time, the drive-side heat radiation portion 51 (heat radiation member 50) does not directly contact the case main body 21 but indirectly contacts the case main body 21 via the potting resin 60.

  In the present embodiment, the potting resin 60 is accommodated up to about half the vertical height of the coil bobbin 320. However, the accommodation amount of the potting resin 60 is not limited to this as long as the driving-side heat radiation portion 51 can be fixed. For example, the potting resin 60 may be accommodated up to about a quarter of the vertical height of the coil bobbin 320, or the entire space in the case body 21 may be covered with the potting resin 60. .

  Further, in the present embodiment, the driving side heat radiating part 51 (heat radiating member 50) is prevented from coming into direct contact with the yoke 350 while the driving side heat radiating part 51 (heat radiating member 50) is fixed by the potting resin 60. That is, the drive side heat radiation part 51 (heat radiation member 50) is in contact with the yoke 350 through the potting resin 60, and the drive side heat radiation part 51 (heat radiation member 50) is in contact with the yoke 350 indirectly. I have to.

  Furthermore, in this embodiment, in order to release the heat generated in the contact block 40 due to the current flowing when the pair of fixed terminals 420 and 420 are electrically conducted to the outside of the case 20, Side heat radiating member) 52 is opposed to the contact block 40. That is, the heat radiating member 50 includes a substantially plate-like contact side heat radiating portion (contact side heat radiating member) 52 whose inner surface 52 a faces the contact block 40.

  In this embodiment, the drive side heat radiating part (drive side heat radiating member) 51 and the contact side heat radiating part (contact side heat radiating member) 52 are integrally formed. Specifically, the drive-side heat radiating portion 51 extending in the vertical direction and the contact-side heat radiating portion 52 extending in the vertical direction are connected via a connecting portion 53 that extends inward and upward. . The heat radiating member 50 in which the drive side heat radiating portion 51 and the contact side heat radiating portion 52 are integrally formed is disposed along the side surfaces on both sides in the front-rear direction of the contact device 10. That is, the contact side heat radiating portion (contact side heat radiating member) 52 faces the upper flange 480 and the peripheral wall 412 of the base 410 in the front-rear direction with the driving side heat radiating portion 51 (heat radiating member 50) fixed by the potting resin 60. I am doing so.

  In this embodiment, the outer side of the capsule yoke block 450 is illustrated as opposed to the upper flange 480 and the peripheral wall 412, but the upper side of the capsule yoke block 450 is opposed to the upper flange 480 and the peripheral wall 412. You may do it.

  In the present embodiment, the contact side heat radiating portion (contact side heat radiating member) 52 is arranged in a third gap S3 formed between the case cover 22 (case 20) and the contact block (contact point portion) 40. ing. At this time, the contact side heat radiating part (contact side heat radiating member) 52 is disposed in the third gap S3 so as not to directly contact the capsule yoke block 450 (contact point block 40). Further, the contact side heat radiating part (contact side heat radiating member) 52 is arranged in the third gap S3 so as not to directly contact the base 410 (contact point block 40) and the case cover 22.

  As described above, the electromagnetic relay 1 of this embodiment includes the drive block (drive unit) 30 that opens and closes the contact block (contact unit) 40 and the case 20 in which the drive block (drive unit) 30 is accommodated. It is equipped with.

  A first gap S <b> 1 is formed between the case main body 21 (case 20) and the drive block (drive unit) 30.

  And in the 1st clearance S1, the heat radiating member 50 which discharge | releases the heat which arises in the drive block (drive part) 30 to the exterior of the case 20 is arrange | positioned.

  By so doing, heat generated in the drive block (drive unit) 30 can be released to the outside of the case 20 via the heat dissipation member 50, and the heat dissipation efficiency of the electromagnetic relay 1 can be further improved. In the present embodiment, the heat radiation member 50 is disposed in a space (first gap S <b> 1) formed in order to easily accommodate the drive block (drive unit) 30, and the electromagnetic relay 1 is formed. The space that can be created is used effectively.

  In the present embodiment, the drive block (drive unit) 30 includes a coil 330 that has a coil 330 that generates magnetic flux when energized, and a coil bobbin 320 around which the coil 330 is wound, and around the coil unit 310. And a yoke 350 to be arranged. Further, the winding portion 331 wound around the coil bobbin 320 of the coil 330 is opposed to the yoke 350 and the facing region R1 facing the yoke 350 when viewed in the radial direction from the central axis C of the coil bobbin 320. Non-opposing region R2. And the heat radiating member 50 has the drive side heat radiating part (drive side heat radiating member) 51 arrange | positioned so that the winding part 331 may be opposed to radial direction in the non-facing area | region R2.

  If it carries out like this, since it can suppress that the yoke 350 and the thermal radiation member 50 overlap when it sees to radial direction from the central axis C of the coil bobbin 320, the electromagnetic relay 1 will enlarge in the radial direction of the coil bobbin 320. Can be suppressed.

  Further, the second gap is provided between the case main body 21 (case 20) and the drive-side heat radiation part 51 (heat radiation member 50) in a state where the drive-side heat radiation part 51 (heat radiation member 50) is disposed in the first gap S1. S2 is formed. That is, the drive-side heat radiating portion 51 and the case main body 21 are prevented from directly contacting each other.

  By doing so, it is not necessary to increase the accuracy when assembling the electromagnetic relay 1, so that the electromagnetic relay 1 can be assembled more easily.

  Further, at least a part of the contact block (contact part) 40 is accommodated in the case cover 22 (case 20), and between the case cover 22 (case 20) and the contact block (contact part) 40 is accommodated. A third gap S3 is formed. And the heat radiating member 50 has the contact side heat radiating part (contact side heat radiating member) 52 arrange | positioned in 3rd clearance gap S1.

  By so doing, heat generated in the contact block 40 can also be released to the outside of the case 20 through the heat radiating member 50, so that the heat dissipation efficiency of the electromagnetic relay 1 can be further improved.

  Further, the contact side heat radiating portion (contact side heat radiating member) 52 and the case cover 22 (case 20) are prevented from coming into direct contact.

  If it carries out like this, since it becomes unnecessary to raise the precision at the time of assembling the electromagnetic relay 1, it becomes possible to assemble the electromagnetic relay 1 more easily.

  Moreover, in this embodiment, the drive side heat radiating part 51 and the contact side heat radiating part 52 are integrally formed.

  By so doing, it is possible to suppress an increase in the number of components, so that the assembly process can be simplified and the cost can be reduced.

  Moreover, in this embodiment, the heat radiating member 50 is comprised using the metal heat sink.

  As described above, by using a metal heat radiating plate having a relatively high thermal conductivity as the heat radiating member 50, the heat radiating efficiency can be improved without bringing the heat radiating member 50 into direct contact with the case 20 or the contact device 10. become. In other words, even when a gap is formed between the heat radiating member 50 and the case 20 or between the heat radiating member 50 and the contact device 10, the heat radiating efficiency can be increased. In addition, by using a metal heat radiating plate that is not easily deformed, the heat radiating member 50 can be more easily disposed in the gap between the case 20 and the contact device 10.

  Moreover, the heat radiating member 50 is being fixed by the potting material 60 accommodated in 1st clearance gap S1.

  Thus, by fixing the heat radiating member 50 with the potting material 60, it is possible to prevent the heat radiating member 50 from being displaced. In addition, by fixing the heat radiating member 50 with the potting material 60, the heat radiating member 50 can be fixed more easily in a state where it is not in direct contact with the case 20 or the contact device 10.

  Moreover, in this embodiment, the heat radiating member 50 and the yoke 350 are made not to contact directly.

  In this way, the electromagnetic relay 1 can be assembled more easily. Further, the magnetic circuit formed in the yoke 350 can be prevented from being affected by the heat radiating member 50.

  Further, the heat radiating member 50 and the base 410 are prevented from coming into direct contact.

  This also makes it possible to assemble the electromagnetic relay 1 more easily.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in each of the embodiments described above, an example in which the yoke is not provided around the movable contact is illustrated, but a yoke may be provided around the movable contact. As this yoke, for example, a yoke composed of an upper yoke and a lower yoke can be used, or a yoke composed of only one of the yokes can be used.

  Further, the contact portion and the drive portion can be formed in various shapes. For example, the shape of the coil bobbin can be various, and the arrangement of the coil bobbin can be changed as appropriate. Moreover, it is good also considering a yoke upper plate as a stationary member without using a fixed iron core.

  In addition, movable contacts, fixed terminals, and other detailed specifications (shape, size, layout, etc.) can be changed as appropriate.

1 Electromagnetic Relay 20 Case 30 Drive Block (Driver)
310 Coil part 320 Coil bobbin 330 Coil 331 Winding part 331a Outer surface 350 Relay 40 Contact block (contact part)
50 Heat dissipation plate (heat dissipation member)
51 Driving side heat radiating member 52 Contact side heat radiating member 60 Potting material C Central axis R1 Opposing area R2 Non-opposing area S1 First gap S2 Second gap S3 Third gap

Claims (7)

A drive unit for opening and closing the contact part;
A case in which the drive unit is accommodated;
With
A first gap is formed between the case and the drive unit,
The electromagnetic relay according to claim 1, wherein a heat radiating member that releases heat generated by the driving unit to the outside of the case is disposed in the first gap. The drive unit is
A coil unit having a coil for generating magnetic flux by energization and a coil bobbin around which the coil is wound;
A yoke disposed around the coil portion;
With
The winding portion wound around the coil bobbin of the coil includes a facing region facing the yoke and a non-facing region not facing the yoke when viewed in the radial direction from the central axis of the coil bobbin. , And
2. The electromagnetic relay according to claim 1, wherein the heat radiating member includes a drive side heat radiating member disposed to face the winding portion in the radial direction in the non-facing region.   The electromagnetic relay according to claim 1, wherein a second gap is formed between the case and the heat dissipation member in a state where the heat dissipation member is disposed. In the case, at least a part of the contact portion is accommodated,
A third gap is formed between the case and the contact portion,
The electromagnetic relay according to claim 1, wherein the heat radiating member includes a contact-side heat radiating member disposed in the third gap.   The electromagnetic relay according to claim 4, wherein the driving side heat radiating member and the contact side heat radiating member are integrally formed.   The electromagnetic relay according to claim 1, wherein the heat radiating member is a metal heat radiating plate.   The electromagnetic relay according to claim 1, wherein the heat radiating member is fixed by a potting material accommodated in the first gap.

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