JP5351735B2 - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay capable of suppressing occurrence of dew-condensation and freezing at a contact part and thereby preventing a conduction failure of the contact part. <P>SOLUTION: The electromagnetic relay is provided with an electromagnet block 2 having: a bobbin 22 on which a coil 21 is wound around, an iron core 23 inserted into an inner diameter part 22a of the bobbin 22, and a yoke 24 for forming a magnetic circuit together with the iron core 23; a contact point block 4 having a fixed contact part 40 and a movable contact point part 43 structured to be in a free contact/separation with/from the fixed contact point part 40 in accordance with switching between on/off of conduction power to the coil 21; and a case 1 for housing the electromagnet block 2 and the contact point block 4, in its inside. The electromagnet block 2 is arranged on one face side of the case 1 and the contact point block 4 on the other face side opposing the one face of the case 1, and when the bobbin 22 and the yoke 24 contact with the inner face of the case 1, a coil space 51 arranged with the coil 21 is separated from a contact space 52 arranged in the contact point block 4. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electromagnetic relay.

  As a conventional electromagnetic relay, an electromagnet block including a bobbin around which a coil is wound, an iron core that passes through an inner diameter portion of the bobbin, and a yoke that forms a magnetic circuit together with the iron core, a fixed contact, and energization of the coil A contact block having a movable contact configured to be able to contact and separate from a fixed contact in response to turning on and off, and a case housing the electromagnetic block and the contact block inside, and from the bottom of the case to the coil of the electromagnetic block There is provided a coil terminal to be connected, and a fixed contact terminal and a movable contact terminal respectively connected to a fixed contact and a movable contact of a contact block project.

  For example, the movable contact and the fixed contact are provided in a state of being separated from each other. When the coil is energized in this state, the movable contact is attracted to and abuts on the fixed contact by electromagnetic force generated in the coil. The fixed contact is electrically connected. Further, when the energization to the coil is cut off, the movable contact is separated from the fixed contact by the elastic action of the spring provided with the movable contact, and is electrically disconnected (see, for example, Patent Document 1).

JP 2009-9710 A

  In a conventional electromagnetic relay, the temperature inside the case rises using the coil as a heat source when the coil is energized. Further, since the contact portion composed of the movable contact and the fixed contact is connected to the contact terminal protruding from the bottom surface of the case, it is easily affected by the ambient temperature outside the case. For example, when the ambient temperature is low, heat is radiated from the contact terminal, and the temperature of the contact portion is lowered. For this reason, a temperature difference is generated between the temperature inside the case heated by the coil when the coil is energized and the temperature of the contact portion, and condensation occurs at the contact portion having a low temperature. In addition, when the ambient temperature is below freezing, dew condensation occurs, which may cause a conduction failure.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide an electromagnetic relay capable of suppressing the occurrence of dew condensation and icing at the contact portion and preventing the conduction failure of the contact portion.

  The invention of claim 1 includes a bobbin around which a coil is wound, an iron core inserted through an inner diameter portion of the bobbin, an electromagnetic block including a yoke that forms a magnetic circuit together with the iron core, a fixed contact, and a coil Equipped with a contact block with a movable contact that can be connected to and separated from the fixed contact in response to turning on and off of electricity, and a case that houses the electromagnet block and the contact block inside, and the electromagnet block is placed on one side of the case The contact block is arranged on the other side facing the one surface of the case, and the space where the coil is arranged is isolated from the space where the contact block is arranged by the bobbin and the yoke coming into contact with the inner surface of the case. It is characterized by.

  According to the present invention, since the space in which the coil is disposed is isolated from the space in which the contact block is disposed, the warm air in the space in which the coil is disposed is energized when the coil is energized. The temperature difference between the space where the contact block is arranged and the contact portion is reduced as compared with the conventional case. Thereby, it can suppress that dew condensation and icing generate | occur | produce in a contact part, and can prevent the conduction | electrical_connection defect of a contact part.

  According to a second aspect of the present invention, in the first aspect of the invention, a convex portion is formed from one surface of the case, the convex portion abuts on the bobbin and the yoke, and the bobbin and the yoke are arranged on one surface and the other surface of the case. It is made to contact | abut to the side surface of the case to connect.

  According to the present invention, it is possible to suppress the occurrence of dew condensation and icing on the contact portion with a simple structure without adding new parts, and to prevent conduction failure of the contact portion.

  As described above, in the present invention, by preventing the warm air in the space where the coil is arranged from flowing into the space where the contact block is located, it is possible to suppress the occurrence of condensation and icing in the contact portion, There is an effect that it is possible to prevent the conduction failure of the contact portion.

The AA sectional view of the electromagnetic relay in the embodiment of the present invention is shown. BB sectional drawing of the electromagnetic relay in the same as the above is shown. CC sectional drawing of the electromagnetic relay in the same as the above is shown. DD sectional drawing of the electromagnetic relay in the same as the above is shown. The external appearance top view of the electromagnetic relay in the same as the above is shown. The external perspective view of the electromagnetic relay in the same as above is shown The disassembled perspective view of the electromagnetic relay in the same as the above is shown. AA sectional drawing which shows the coil space and contact space of an electromagnetic relay in the same as the above is shown.

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

(Embodiment)
The electromagnetic relay of this embodiment is demonstrated using FIGS. 1-4 is a sectional view of the electromagnetic relay, FIG. 5 is an external top view, FIG. 6 is an external perspective view, and FIG. 7 is an exploded perspective view. In addition, let the direction orthogonal to the up-down left-right direction on the basis of the up-down-left-right in FIG. 1 be a front-back direction.

  1 is a cross-sectional view in the AA direction in FIG. 5 viewed from the rear, FIG. 2 is a cross-sectional view in the BB direction in FIG. 1 viewed from above, and FIG. 3 is a cross-sectional view in FIG. FIG. 4 is a sectional view in the direction DD in FIG. 1 as viewed from the right.

  As shown in FIGS. 1-7, the electromagnetic relay in this embodiment accommodates the electromagnet block 2, the armature 3, and the contact block 4 in the case 1 formed in the box shape from insulating materials, such as resin. doing. Hereinafter, a direction orthogonal to the up / down / left / right direction with reference to the up / down / left / right direction in FIG.

  The case 1 includes a substantially rectangular flat plate-shaped base 11 and a substantially rectangular box-shaped cover 12 whose bottom surface is open and covers the base 11. The cover 12 includes a cover top surface 12a facing the base 11, cover side surfaces 12b and 12c adjacent to the cover top surface 12a in the front-rear direction, and cover side surfaces 12d and 12e adjacent to the cover top surface 12a in the left-right direction. .

  The electromagnet block 2 includes a hollow cylindrical bobbin 22 around which the coil 21 is wound, an iron core 23 inserted through the inner diameter portion 22 a of the bobbin 22, and a yoke 24 that forms a magnetic circuit together with the iron core 23.

  The bobbin 22 is made of an insulating material such as a resin, rectangular flange portions 22b and 22c are formed at both upper and lower ends in the axial direction, and the coil 21 is wound between the flange portion 22b and the flange portion 22c. Moreover, the collar part 22b is extended in the front-back direction, and the front-end surface and the rear-end surface are contact | abutting with the cover side surfaces 12b and 12c. Further, the flange 22c extends in the left direction and the front-rear direction, the left end surface is in contact with the cover side surface 12d, and the front end surface and the rear end surface are in contact with the cover side surfaces 12b and 12c. In addition, recesses 22d and 22e are formed in the front and rear corners of the left end of the flange 22c, and through holes through which a pair of coil terminals 25 to which the tips of the coils 21 are connected are respectively connected to the bottom surfaces of the recesses 22d and 22e. 25a is drilled. The coil terminal 25 is formed in a long plate shape that is long in the vertical direction with a conductive material such as copper, and the tip of the coil 21 is wound around the upper end of the coil terminal 25 and connected by solder or the like. The coil terminal 25 is formed integrally with the bobbin 22.

  The iron core 23 is formed in a long cylindrical shape, and a flange portion 23a is formed at the lower end. The flange portion 23a is fitted into a circular recess 22f formed at the approximate center of the flange portion 22c of the bobbin 22.

  The yoke 24 is made of a magnetic material and is substantially L-shaped from one piece 24a and the other piece 24b extending downward from the right end of the one piece 24a. The one piece 24a is fitted into a substantially rectangular cutout portion 22g formed on the upper surface of the flange portion 22b of the bobbin 22, and an insertion hole 24c is formed. The upper end portion of the iron core 23 is formed in the insertion hole 24c. Insert. The other piece 24b is formed along the right end of the bobbin 22, and the other piece 24b is in contact with the right end surface of the flange portion 22c. Further, the other piece 24b is formed wider in the front-rear direction than the one piece 24a, and the front end face and the rear end face of the other piece 24b are in contact with the cover side faces 12b and 12c.

  The armature 3 is formed of a magnetic material into a long flat plate shape, and is disposed to face the flange portion 23 a of the iron core 23. Further, the upper right end surface of the armature 3 is in contact with the lower surface of the other piece 24 b of the yoke 24.

  The contact block 4 includes a contact portion 40, a fixed contact terminal 42, a movable contact plate 44, a movable contact terminal 45, and a fixed contact plate 47.

  The contact portion 40 includes fixed contacts 41 and 46 and a movable contact portion 43 configured to be able to contact and separate from the fixed contacts 41 and 46 according to whether the coil 21 is turned on or off.

  The fixed contact 41 is provided on the fixed contact terminal 42, and the fixed contact 46 is provided on the fixed contact plate 47. A movable contact portion 43 constituted by the movable contacts 43 a and 43 b is provided on the movable contact plate 44. Further, the movable contacts 43a and 43b are arranged at positions facing each other with the movable contact plate 44 interposed therebetween. Further, the movable contact plate 44 is connected to the movable contact terminal 45.

  Further, on the lower surface of the flange portion 22c of the bobbin 22, substantially rectangular structures 22h and 22i are formed at both front and rear corners of the left end, and in a space 22j formed between the structures 22h and 22i. The contact part 40 is arranged. The lower surfaces of the structures 22h and 22i are in contact with the base 11, and the left surfaces of the structures 22h and 22i are in contact with the cover side surface 12d.

  The fixed contact terminal 42 includes a long flat plate-like terminal portion 42a that is long in the vertical direction and an extending portion 42b that extends leftward from the upper end of the terminal portion 42a, and is substantially L-shaped by a conductive material such as copper. The fixed contact 41 is provided in the vicinity of the tip of the extended portion 42b. The coil terminal 25 is formed so as to penetrate the structures 22h and 22i in the vertical direction.

  The fixed contact plate 47 is formed in a flat plate shape using a conductive material such as copper, and the fixed contact 46 is provided at a position facing the fixed contact 41 in the vertical direction. In the electromagnetic relay of this embodiment, the fixed contact plate 47 does not include a contact terminal for connecting to the outside of the case 1.

  The movable contact plate 44 is formed in a substantially L shape with a conductive material such as copper, with a plate spring-like operating piece 44a that is long in the left-right direction and a fixed piece 44b that extends upward from the right end of the operating piece 44a. Has been. The armature 3 is fixed on the upper surface of the operating piece 44a, the movable contact 43a is provided on the upper surface of the left end of the operating piece 44a at a position facing the fixed contact 41, and the fixed contact is provided on the lower surface of the operating end 44a. A movable contact 43 b is provided at a position facing 46.

  The fixed piece 44b is provided between the other piece 24b of the yoke 24 and the movable contact terminal 45, and is fixed to the upper end side of the movable contact terminal 45 by caulking or the like.

  The movable contact terminal 45 is formed in a long plate shape that is long in the vertical direction by a conductive material such as copper.

  The base 11 is provided with insertion holes (not shown) through which the terminal portion 42a of the fixed contact terminal 42, the movable contact terminal 45, and the pair of coil terminals 25 are inserted.

  And the rib 13a, 13b, 13c and the positioning rib 14 are formed in the cover top surface 12a.

  The rib 13a is in a position facing the flange 22b on the left side of the notch 22g formed in the flange 22b of the bobbin 22, and extends in the front-rear direction from the front end to the rear end of the cover top surface 12a. The rib 13a is in contact with the upper surface of the flange portion 22b.

  The ribs 13b and 13c are formed of substantially rectangular wall bodies so as to fill the width difference between the one piece 24a and the other piece 24b of the yoke 24 from above. Further, the ribs 13 b and 13 c are in contact with the one piece 24 a, the other piece 24 b, and the right end surface of the flange portion 22 b of the bobbin 22.

  The positioning ribs 14 cover the ribs 13a and 13c between the ribs 13a and 13c at two positions formed from the front end of the cover top surface 12a between the ribs 13a and the ribs 13b at a position facing the flange portion 22b of the bobbin 22. Projections are formed in two locations formed from the rear end of the top surface 12a toward the inside of the case 1, and are in contact with the upper surface of the flange portion 22b.

  In the electromagnetic relay of the present embodiment having the above-described configuration, when the coil 21 is energized, the armature 23 is magnetized, so that the armature 3 is attracted and brought into contact with the flange portion 23a of the iron core 23. 3, the distal end of the operating piece 44 a of the movable contact plate 44 is displaced upward, the movable contact 43 a provided at the distal end contacts the fixed contact 41, and the movable contact terminal 45 and the fixed contact terminal 42 are electrically connected. Conducted.

  Further, when the power supply to the coil 21 is cut off, the iron core 23 is demagnetized, the armature 3 is separated from the flange 23a of the iron core 23 by the elastic action of the movable contact plate 44, and the operating piece 44a of the movable contact plate 44 is The tip is displaced downward. Accordingly, the movable contact 43a provided at the tip of the operating piece 44a is separated from the fixed contact 41, and the movable contact terminal 45 and the fixed contact terminal 42 are electrically disconnected.

  Further, when the coil 21 is energized, the temperature in the vicinity of the coil 21 rises with the coil 21 as a heat source. On the other hand, since the terminal portion 42a of the fixed contact terminal 42 and the movable contact terminal 45 protrude from the lower surface of the base 11, the temperature of the contact portion 40 is easily affected by the ambient temperature outside the case 1, and the ambient temperature is low. The temperature of the contact portion 40 decreases. When the air heated by the coil 21 comes into contact with the low temperature contact part 40, dew condensation occurs on the contact part 40. Furthermore, when the ambient temperature is below freezing, there is a risk of causing a conduction failure due to freezing.

  Therefore, in the electromagnetic relay of the present embodiment, the coil space 51 in which the coil 21 is arranged in the configuration as described above is isolated from the contact space 52 in which the contact portion 40 is arranged. FIG. 8 shows the positional relationship between the coil space 51 in which the coil 21 is arranged and the contact space 52 in which the contact portion 40 is arranged. FIG. 8 shows the outline of the coil space 51 and the contact space 52 with bold lines in order to clarify the coil space 51 and the contact space 52.

  The coil space 51 in which the coil 21 is arranged is mainly a space between the flange portion 22b and the flange portion 22c of the bobbin 22, and specifically, from the flange portions 22b and 22c of the bobbin 22 and the rib 13a. This is a space in which the coil 21 is surrounded by the cover top surface 12a on the left side, the cover side surfaces 12b, 12c, 12d, and the other piece 24b of the yoke 24.

  The contact space 52 in which the contact portion 40 is arranged is a space in the case 1 excluding the coil space 51 in which the coil 21 is arranged, and the cover top surface 12a, the cover side surfaces 12b, 12c, This is a substantially U-shaped space having 12e and the base 11 as an outline. The specific configuration of the contact space 52 includes a space between the base 11 and the flange portion 22c of the bobbin 22, a space between the cover side surface 12e and the other piece 24b of the yoke 24, and a right side of the rib 13a. This is a space formed by the cover top surface 12a and the space between the flange portion 22b of the bobbin 22 and the one piece 24a of the yoke 24.

  The specific structure that insulates the coil space 51 and the contact space 52 is that the flange portions 22b and 22c of the bobbin 22 extend in the front-rear direction and come into contact with the cover side surfaces 12b and 12c. The upper and lower portions of the contact space 52 are prevented from continuing along the cover side surfaces 12b and 12c. Further, the rib 13a provided on the cover top surface 12a contacts the flange portion 22b, thereby preventing the coil space 51 from continuing to the upper portion of the contact space 52 along the cover top surface 12a. Further, the ribs 13b and 13c provided on the cover top surface 12a come into contact with the right end surface of the flange 22b and the yoke 24, so that the coil space 51 is located on the right side of the contact space 52 from the gap between the flange 22b and the other piece 24b. This prevents it from continuing to the part. Further, the front end surface and the rear end surface of the other piece 24b of the yoke 24 are in contact with the cover side surfaces 12b and 12c, thereby preventing the space 51 from continuing to the right part of the space 52 along the cover side surfaces 12b and 12c. It is out.

  Further, the left end surface of the flange portion 22c of the bobbin 22 contacts the cover side surface 12d, and the right end surface of the flange portion 22c contacts the other piece 24b of the yoke 24, so that the coil space 51 is covered with the cover side surface 12d and the other piece 24b. It is prevented from continuing to the lower part of the contact space 52 along the left surface.

  Further, the lower surfaces of the structures 22h and 22i formed on the lower surface of the flange portion 22c of the bobbin 22 are in contact with the base 11, and the left surfaces of the structures 22h and 22i are in contact with the cover side surface 12d. 51 is prevented from continuing to the lower part of the contact space 52 along the cover side surface 12 d and the base 11. Furthermore, the front end surface of the structure 22h contacts the cover side surface 12b, and the rear end surface of the structure 22i contacts the cover side surface 12c, so that the coil space 51 extends along the cover side surfaces 12b and 12c to the lower portion of the contact space 52. It prevents it from continuing.

  With the above configuration, the air in the coil space 51 heated by the coil 21 does not flow into the contact space 52 in which the contact portion 40 is disposed. Therefore, the temperature of the contact space 52 in which the contact portion 40 is disposed is substantially the same as the ambient temperature, and the temperature difference with the contact portion 40 is reduced. As a result, even when the ambient temperature is low, it is possible to suppress the occurrence of dew condensation and icing on the contact portion 40 and to prevent the conduction failure of the contact portion 40.

  Further, in the present invention, when isolating the air in the coil space 51 in which the coil 21 is disposed from the contact space 52 in which the contact portion 40 is disposed, it is not necessary to newly add a part such as a shielding wall, By simply changing the shape of the case 1, the bobbin 22 and the yoke 24 with the same component configuration as before, it is possible to easily prevent condensation and icing from occurring on the contact portion 40 and to prevent conduction failure of the contact portion 40. There is an advantage.

DESCRIPTION OF SYMBOLS 1 Case 2 Electromagnet block 3 Armature 4 Contact block 12 Cover 13a, 13b, 13c Rib 21 Coil 22 Bobbin 22b, 22c Bobbin collar 23 Iron core 24 Relay 41 Fixed contact 43a Movable contact 51 Coil space 52 Contact space

Claims (2)

An electromagnet block comprising a bobbin around which a coil is wound, an iron core that passes through an inner diameter portion of the bobbin, and a yoke that forms a magnetic circuit together with the iron core;
A contact block including a fixed contact and a movable contact configured to be freely connected to and separated from the fixed contact according to whether the coil is energized;
With a case that houses an electromagnetic block and a contact block inside,
An electromagnet block is arranged on one side of the case, a contact block is arranged on the other side opposite to the one side of the case, and a bobbin and a yoke contact the inner surface of the case, so that the space where the coil is arranged becomes the contact block. An electromagnetic relay characterized in that it is isolated from the space in which it is placed.   A convex portion is formed from one surface of the case, the convex portion abuts on the bobbin and the yoke, and the bobbin and the yoke are abutted on a side surface of the case connecting the one surface of the case with the other surface. The electromagnetic relay according to claim 1.

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