JP5585511B2 - Electromagnetic relay - Google Patents

Description

  The present invention relates to an electromagnetic relay that opens and closes an electric circuit.

  In the conventional electromagnetic relay, the housing space in the casing in which components such as the electromagnetic coil are arranged communicates with the external space of the casing through an air passage formed in the casing (for example, Patent Document 1). 2).

JP 2010-92829 A JP 2010-177165 A

  However, in the conventional electromagnetic relay, a foreign substance in the magnetic body enters the accommodation space through the air passage with the air, and the foreign substance in the magnetic body adheres to the movable iron piece, the fixed iron core, etc. There is a problem that a contact failure occurs.

  In view of the above points, an object of the present invention is to prevent malfunction of a magnetic material due to foreign matter.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided an electromagnetic relay in which the movable contact (20) is driven by the electromagnetic force of the electromagnetic coil (14), and is provided inside the casing (10, 11). The electromagnetic coil (14) and the movable contact (20) are accommodated in the formed accommodation space (10a), and an air passage (101) that communicates the accommodation space (10a) and the external space of the housing (10, 11). A collecting member (162) that is formed in the housing (10, 11) and collects magnetic foreign matter by magnetism is disposed in the air passage (101).

  According to this, since the foreign substance of the magnetic substance contained in the breathing air is collected by the collecting member (162), the intrusion of the foreign substance of the magnetic substance into the accommodation space (10a) is prevented. It is possible to prevent malfunction of the electromagnetic relay due to foreign matter.

Furthermore, in the invention according to claim 1, conductive magnetic includes a coil yoke constituting the magnetic path of the induced magnetic flux by (14) (16), a yoke (16) includes a body portion (161) of the housing space ( 10a), the foot (162) is inserted into the air passage (101), and the foot (162) functions as a collecting member.

  According to this, since the foot part (162) of the yoke (16) having residual magnetism is used as the collecting member, the invention can be carried out without adding any components.

In the invention described in claim 2, in the electromagnetic relay according to claim 1, as foreign matters magnetic material flowing from the external space side collides with the leg portion (162), the external space side in an air passage (101) The opening (102) is arranged to face the foot (162).

  According to this, since the foreign substance of the magnetic body flowing in from the external space side collides with the foot part (162), the foreign substance of the magnetic substance can be reliably collected on the foot part (162).

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a front section showing an electromagnetic relay concerning one embodiment of the present invention. FIG. 2 is a right side cross-sectional view of FIG. 1 showing a case cut away. It is a bottom view of FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG.

  An embodiment of the present invention will be described. FIG. 1 is a front sectional view showing an electromagnetic relay according to an embodiment, FIG. 2 is a right side sectional view of FIG. 1 shown by cutting a case, and FIG. 3 is a bottom view of FIG.

  As shown in FIGS. 1 to 3, in the electromagnetic relay according to the present embodiment, a bottomed cylindrical case 11 made of resin is fitted to a plate-like base 10 made of resin. A housing space 10 a is formed inside by the case 11. The accommodation space 10 a is communicated with the external space of the base 10 and the case 11 through two air passages 101 formed in the base 10. Note that the base 10 and the case 11 constitute a housing of the present invention.

  A fixed contact holding member 12 made of conductive metal is fixed to the base 10. The fixed contact holding member 12 penetrates the base 10, and one end side is located in the accommodation space 10a and the other end side is located in the external space.

  A fixed contact 13 made of conductive metal is caulked and fixed to an end of the fixed contact holding member 12 on the side of the accommodation space 10a. A make terminal 121 connected to an external harness (not shown) is formed on the external space side of the fixed contact holding member 12.

  The electromagnetic coil 14 disposed in the accommodating space 10a has a flanged cylindrical resin spool 141 and a coil wire 142 wound around the outer periphery of the cylindrical portion of the spool 141, and generates electromagnetic force when energized. Electric power is supplied to the coil wire 142 via two coil terminals 15 penetrating the base 10.

  The yoke 16 is made of a magnetic metal material, bent in a U shape, and constitutes a magnetic path of magnetic flux induced by the electromagnetic coil 14. The yoke 16 includes a main body 161 positioned in the accommodation space 10a, two legs 162 as a collecting member inserted into the air passage 101, and a common protruding from the external space and connected to an external harness. Terminal 163. The yoke 16 is fixed to the base 10 by press-fitting the foot 162 into the air passage 101 formed in the base 10.

  A fixed iron core 17 made of a magnetic metal material is disposed in the cylindrical portion of the spool 141. The fixed iron core 17 is fixed to the yoke 16, and the electromagnetic coil 14 is sandwiched between the yoke 16 and the fixed iron core 17.

  A movable iron piece 18 made of a magnetic metal is disposed at a position facing the fixed iron core 17, and the movable iron piece 18 is attracted to the fixed iron core 17 side when the coil is energized. The movable iron piece 18 is connected to the yoke 16 by a thin plate metal movable plate spring 19 bent into a substantially L shape.

  A movable contact 20 made of a conductive metal is caulked and fixed to the movable plate spring 19, and the movable contact 20 is disposed to face the fixed contact 13. The movable contact 20 is electrically connected to the common terminal 163 of the yoke 16 via the movable leaf spring 19. The movable leaf spring 19 causes the movable iron piece 18 to act on the movable iron piece 18 with an elastic force in such a direction that the movable iron piece 18 is separated from the fixed iron core 17 and the movable contact 20 is separated from the fixed contact 13.

  Next, the principal part of the electromagnetic relay according to the present embodiment will be described. 4 is a cross-sectional view taken along line AA in FIG. 2, FIG. 5 is a cross-sectional view taken along line BB in FIG. 4, and FIG. 6 is a cross-sectional view taken along line CC in FIG.

  As shown in FIGS. 4 to 6, the foot 162 of the yoke 16 is press-fitted into the air passage 101 that allows the accommodation space 10 a to communicate with the external space. Further, the protrusion 164 formed on the foot 162 bites into the base 10 so that the yoke 16 does not come off from the base 10. Then, breathing air flows through a portion of the air passage 101 that is not blocked by the foot 162.

  The end of the air passage 101 on the outer space side has three slit-shaped openings 102. Incidentally, among the three openings 102, the central opening 102 has a width of 0.15 mm and a length of 0.6 mm, and the other two openings 102 have a width of 0.15 mm and a length of 1.2 mm. .

  The three openings 102 are located in the projection plane of the foot 162 when viewed along the press-fitting direction of the foot 162 (that is, the flow direction of breathing air). In other words, the three openings 102 are arranged to face the end surfaces in the longitudinal direction of the legs 162. Thereby, the foreign substance of the magnetic body which flows in from the external space side collides with the foot 162.

  In the electromagnetic relay configured as described above, when the electromagnetic coil 14 is energized, the movable iron piece 18 is attracted to the fixed iron core 17 side by the electromagnetic force, and the movable contact 20 contacts the fixed contact 13 to close the electric circuit. On the other hand, when the energization of the electromagnetic coil 14 is interrupted, the movable contact 20 is separated from the fixed contact 13 by the elastic force of the movable leaf spring 19, and the electric circuit is opened.

  Here, when the foreign substance of the magnetic substance is contained in the breathing air flowing through the air passage 101, the foreign substance of the magnetic substance is attracted by the residual magnetism of the foot part 162 and collected by the foot part 162. . Accordingly, it is possible to prevent the foreign material from entering the storage space 10a and to prevent malfunction of the electromagnetic relay due to the foreign material.

  At this time, since the three openings 102 are arranged so as to face the foot portion 162 so that the magnetic foreign matter flowing in from the external space side collides with the foot portion 162, the magnetic foreign matter is prevented from flowing into the foot portion 162. The portion 162 can be reliably collected.

  In the above embodiment, the magnetic substance foreign matter is collected by the foot 162 as the collecting member. However, a permanent magnet as the collecting member is disposed in the air passage 101, and the permanent magnet is arranged. The foreign material of the magnetic material may be collected.

10 Base (housing)
11 Case (housing)
14 Electromagnetic coil 20 Movable contact 101 Air passage 10a Accommodating space 162 Foot (collecting member)

Claims (2)

The movable contact (20) is driven by the electromagnetic force of the electromagnetic coil (14) ,
The electromagnetic coil (14) and the movable contact (20) are accommodated in an accommodation space (10a) formed inside the housing (10, 11),
An air passage (101) that connects the housing space (10a) and the external space of the housing (10, 11) is formed in the housing (10, 11).
An electromagnetic relay in which a collecting member (162) that collects magnetic foreign matter magnetically is disposed in the air passage (101) ,
A yoke (16) that constitutes a magnetic path of magnetic flux induced by the electromagnetic coil (14) is provided. The yoke (16) has a body portion (161) disposed in the accommodation space (10a) and a foot portion. The electromagnetic relay is characterized in that (162) is inserted into the air passage (101) and the foot (162) functions as the collecting member . The opening (102) on the external space side of the air passage (101) faces the foot (162) so that the magnetic foreign matter flowing in from the external space collides with the foot (162). The electromagnetic relay according to claim 1 , wherein the electromagnetic relay is arranged.

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