JP2009283255A - Relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relay suppressing generation of dew condensation and freezing on a fixed contact. <P>SOLUTION: The relay includes an electromagnetic block 2 having a core 7 with a coil 4 wound therearound and a yoke 9 forming a magnetic circuit together with the core 7, a contact block 3 having the fixed contact 10 and a movable contact 11 freely in/out of contact with the fixed contact 10 according to on/off of conduction to the coil 4, and a case 1 containing the electromagnetic block 2 and the contact block 3. One or a plurality of heat radiation panels 1C is/are projectingly formed on an inner surface of the case 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a relay.

  Conventionally, as shown in FIG. 4, a relay of this type, in which an electromagnet block 2, an armature 8, and a contact block 3 are accommodated in a case 21 formed in a box shape from an insulating material such as a resin. Provided (for example, see Patent Document 1).

  Hereinafter, the vertical and horizontal directions in FIG. 4 are used as a reference, and the direction orthogonal to the vertical and horizontal directions is the front and rear direction.

  The electromagnet block 2 includes a hollow cylindrical coil bobbin 5 around which the coil 4 is wound, an iron core 7 that passes through the inner diameter portion 5 b of the coil bobbin 5, and a yoke 9 that forms a magnetic circuit together with the iron core 7.

  The coil bobbin 5 is made of an insulating material such as a resin, and flanges 5a are formed at both ends in the axial direction, and the coil 4 is wound between the flanges 5a at both ends.

  The iron core 7 is formed in a long columnar shape, and a flange portion 7a is formed at the right end. .

  The yoke 9 is formed of a magnetic material into a substantially L shape from one piece 9a and the other piece 9b where the left end of the one piece 9a is bent upward, and the coil 4 is wound on the upper surface of the one piece 9a. The rotated coil bobbin 5 is placed, and an insertion hole 9c is formed in the other piece 9b. The left end portion of the iron core 7 is inserted and fixed through the insertion hole 9c.

  The armature 8 is made of a magnetic material in an obtuse angled L shape with both sides of one piece 8a and the other piece 8b formed by bending one end of the one piece 8a. The one piece 8a and the other piece A support portion 8 c is provided at a connection portion with 8 b, and one piece 8 a is disposed to face the right end of the iron core 7.

  The contact block 3 includes a fixed terminal plate 13 provided with a fixed contact 10, a movable contact plate 12 provided with a movable contact 11, and a movable terminal plate 14 to which the movable contact plate 12 is connected.

  The fixed terminal plate 13 is a substantially flat L-shaped terminal portion 13a that is long in the vertical direction and an extended portion 13b that extends leftward from the upper end of the terminal portion 13a. The fixed contact 10 is provided in the vicinity of the tip of the extended portion 13b.

  The movable terminal plate 14 is a substantially flat L-shaped terminal portion 14a that is long in the vertical direction, and a bent portion 14b in which the upper end of the terminal portion 14a is bent rightward, and is substantially L-shaped by a conductive material such as copper. It is formed in a shape. A movable contact plate 12 is connected to the upper surface of the bent portion 14b. The movable contact plate 12 is formed from a conductive material into a long leaf spring shape and is movable to a position near the left end facing the fixed contact 10. A contact 11 is provided.

  The case 21 includes a rectangular flat base 1A and a rectangular box-shaped cover 22 that is open on the lower surface and is covered with the base 1A. The base 1A includes a terminal portion 13a of the fixed terminal plate 13, Insertion holes 1a and 1b through which the terminal portions 14a of the movable terminal plate 14 are inserted are formed, and insertion holes (not shown) through which the pair of coil terminals 6 to which both ends of the coil 4 are respectively connected are inserted. It is juxtaposed in the direction. In FIG. 4, only the near side of the pair of coil terminals 6 is shown.

In the relay configured as described above, when the coil 4 is energized, the iron core 7 is magnetized, whereby the one piece 8a of the armature 8 is attracted to the right end of the iron core 7, and the armature 8 is left with the support portion 8c as a fulcrum. The other piece 8b presses the movable contact plate 12 downward. Then, the left end of the movable contact plate 12 is displaced downward, the movable contact 11 provided at the tip of the movable contact plate 12 comes into contact with the fixed contact 10, and the fixed contact terminal 13 and the movable contact terminal 14 are electrically connected. .
JP 2003-031095 A

When the coil 4 is energized, as the coil 4 generates heat, the temperature distribution inside the case 21 becomes a high temperature portion in the vicinity of the coil 4 (shaded portion) as shown in FIG. X ₁₁ near) is intermediate temperature zone, the fixed contact 10 near (broken line _{Y 11} near) becomes a low temperature portion. At that time, when the high-temperature air near the coil 4 reaches the low temperature part near the fixed contact 10, dew condensation occurs on the fixed contact 10, and when the temperature near the fixed contact 10 further decreases, the dew condensation may freeze.

  As described above, there is a problem in that the dew condensation or icing occurs in the fixed contact 10, thereby causing a conduction failure between the fixed contact 10 and the movable contact 11.

  This invention is made | formed in view of the said reason, The objective is to provide the relay which can suppress that dew condensation and icing generate | occur | produce in a fixed contact.

  According to the first aspect of the present invention, there is provided an electromagnetic block including an iron core around which a coil is wound, a yoke that forms a magnetic circuit together with the iron core, a fixed contact, and a fixed contact according to whether the coil is energized. It is composed of a contact block having a movable contact configured to be separable, and a case housing the electromagnet block and the contact block inside, and one or more heat radiating plates protrude from the inner surface of the case. Features.

  According to the present invention, the heat radiating plate is projected on the inner surface of the case, so that the heat radiating plate forming surface is kept away from the coil that is the heat source, and the heat radiating plate forming surface is hardly affected by the heat generated from the coil, The heat sink forming surface is kept at a lower temperature than the vicinity of the fixed contact. Furthermore, because the heat sink is provided on the heat sink plate formation surface, the heat energy transferred from the heat sink to the case is dissipated to the outside of the case. The area of the low temperature part on the heat sink forming surface side can be increased, and most of the dew that is generated when the air heated by the coil is cooled is from the heat sink base to the heat sink forming surface. The amount of water generated in the range and contained in the air in the case decreases. Therefore, it is possible to suppress the occurrence of condensation and icing on the fixed contact.

  According to a second aspect of the present invention, in the first aspect of the present invention, the heat radiating plate protrudes from an inner surface of the case facing the contact block through an electromagnet block.

  According to this invention, by providing a heat sink forming surface at a position away from the contact block, condensation can be generated at a position away from the contact block, and the amount of moisture contained in the air around the fixed contact can be further reduced. It is possible to further suppress the occurrence of condensation and icing on the fixed contact.

  As described above, according to the present invention, there is an effect that it is possible to suppress the occurrence of condensation and icing on the fixed contact.

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

(Embodiment)
An embodiment of the present invention will be described with reference to FIGS. In addition, about the structure which is common in the prior art shown in FIG. 4, a common code | symbol is attached | subjected and description is abbreviate | omitted and hereafter, the direction orthogonal to the up-down left-right direction on the basis of the up-down left-right direction in FIG.

  The difference between this embodiment and the prior art shown in FIG. 4 is that a heat radiating plate 1C is formed on the inner surface of the case 1.

  First, the case 1 is composed of a base 1A and a rectangular box-shaped cover 1B having an open bottom surface that covers the base 1A.

  As shown in FIGS. 2A to 2D, the cover 1B has a plurality of heat radiating plates 1C protruding downward from the inner side (heat radiating plate forming surface) 1D of the upper surface, and arranged side by side in the left-right direction. 1C is formed in a rectangular plate shape from the front end to the rear end of the cover 1B.

  When the cover 1B is covered with the base 1A on which the electromagnet block 2 and the contact block 3 are placed, the heat radiating plate 1C is placed on the heat radiating plate forming surface 1D facing the contact block 3 through the electromagnet block 2. Is located.

Here, when the coil 4 is energized, as shown in FIG. 3, the vicinity of the coil 4 (shaded portion) becomes a high-temperature portion due to the heat generated by the coil 4, and the vicinity of the tip of the heat radiating plate 1 C (near the one-dot chain line X ₂ ) the movable contact 11 near (one-dot chain line X ₁ near), the coil 4 opposed to become intermediate temperature zone for the position, the base portion of the heat radiating plate 1C located at a position apart from the coil 4 than the tip vicinity of the heat radiating plate 1C and a range of over the heat radiating plate forming surface 1D from 1c (dashed line Y ₂ vicinity), the fixed contact 10 near than the movable contact 11 near provided apart from the coil 4 (broken line Y ₁ near), the low temperature portion .

  In particular, since the heat sink 1D is formed on the heat sink plate formation surface 1D, the heat sink plate surface 1D is less susceptible to the heat generated by the coil 4 than the fixed contact 10 and is therefore less susceptible to heat generated by the coil 4. The heat energy absorbed in step 1 is transmitted to the upper surface of the cover 1B and radiated from the upper surface side of the cover 1B to the outside of the case 1, so that the heat radiation capability becomes larger than that of the low temperature portion near the fixed contact 10. Therefore, the temperature of the heat sink forming surface 1D is kept below the temperature near the fixed contact 10.

  At this time, not only the heat sink plate forming surface 1D of the cover 1B but also the base portion 1c of the heat sink plate 1C becomes a low temperature portion, so that the surface area of the low temperature portion on the heat sink plate forming surface 1D side can be increased. Most of the air heated in step 1 is cooled in a wide range from the base portion 1c of the heat radiating plate 1C to the heat radiating plate forming surface 1D, and condensation occurs in this wide range.

  Therefore, in the relay according to the present embodiment, most of the moisture contained in the air in the case 1 appears as condensation on the heat sink forming surface 1D and the base 1c of the heat sink 1C, so that it is contained in the air in the case 1. The amount of water that is lost is reduced.

  In addition, since the heat radiating plate 1C is formed on the heat radiating plate forming surface 1D opposed to the contact block 3 via the electromagnet block 2, the heat radiating plate forming surface 1D and the contact block 3 are separated from each other, and condensation occurs. The heat sink forming surface 1 </ b> D and the base 1 c of the heat sink 1 </ b> C, which are the generation locations, can be moved away from the contact block 3.

  Therefore, in the relay according to the present embodiment, it is possible to suppress condensation and icing that occur at the fixed contact 10.

  In the present embodiment, the heat radiating plate 1C protrudes downward from the heat radiating plate forming surface 1D provided on the upper surface of the cover 1B facing the contact block 3 through the electromagnet block 2, but the cover 1B The low-temperature part may be formed by providing a heat sink plate forming surface on a surface other than the upper surface and projecting the heat sink 1C.

  In the present embodiment, a plurality of heat radiating plates 1C are provided, but one heat radiating plate may be used as long as the heat radiating plate forming surface can be a low temperature portion.

The sectional view of the relay in the embodiment of the present invention is shown. (A)-(d) shows the structure of the cover in the same as the above, (a) is a top view, (b) is an α-α sectional view, (c) is a bottom view, and (d) is a β-β sectional view. Indicates. The temperature distribution inside a relay in the same as above is shown. Sectional drawing of the relay in a prior art example is shown. The temperature distribution inside a relay in the same as above is shown.

Explanation of symbols

1 Case 1C Heat sink 2 Electromagnet block 3 Contact block 4 Coil 7 Iron core 9 Relay 10 Fixed contact 11 Movable contact

Claims (2)

An electromagnetic block comprising an iron core around which a coil is wound, and a yoke that forms a magnetic circuit 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;
It consists of a case that houses an electromagnet block and a contact block inside,
A relay characterized in that one or more heat radiating plates protrude from the inner surface of the case.   The relay according to claim 1, wherein the heat radiating plate protrudes from an inner surface of the case facing the contact block via an electromagnet block.

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