JP2009140679A - Heat radiation structure of electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely reduce heat of an electromagnetic relay inexpensively without using a heat dissipation member of another component. <P>SOLUTION: A concave part 7 is fitted at a bottom surface 3a side of a bottom plate part of a stationery 2 being a yoke of the electromagnetic relay 1, a core 8 at a coil center is penetrated through the bottom plate part, a core fixing part 9 of a lower end side of the core is housed inside the concave part, and the bottom surface of the bottom plate part is brought to plane contact with an outside circuit body 6. And also, the core 8 at the coil center is penetrated through the bottom plate part 3 of the stationary 2 being a yoke of an electromagnetic relay 1', the core fixing part 9 of the lower end side of the core is arranged at the bottom surface side of the bottom plate part, a concave part 22 is fitted at the outside circuit body 6, the core fixing part is housed inside the concave part, and the bottom surface 3a of the bottom plate part 3 is brought to plane contact with the circuit body. A bottom surface 9b of the core fixing part 9 may be in plane contact with the circuit body 6. The bottom plate 3 of the stationery 2 is exposed outside of an outer package case 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat dissipation structure for an electromagnetic relay that dissipates the stationary of the electromagnetic relay to another circuit body.

  FIG. 6 shows one embodiment of a conventional heat dissipation structure for an electromagnetic relay (see Patent Document 1).

  In this structure, the bottom plate portion 45 of the stationary (a yoke member or yoke) 44 is exposed inside the base portion 43 of the case 42 at the bottom portion of the case 42 of the electromagnetic relay 41, and the bottom plate portion 45 is made of a metal plate having a crank plate shape. A heat radiating member (heat transfer member) 47 is welded and joined, and the heat radiating member 47 is joined to the lower horizontal bus bar 48 to dissipate the heat of the stationary 44 from the heat radiating member 47 to the external bus bar 48.

  The stationary 44 is formed in an approximately L shape, and a coil 49 and a core 50 at the center thereof are arranged on the upper side of the bottom plate portion 45, and the inverted L-shaped spring-like movable contact terminal 51 along the side plate portion 46 of the stationary 44. The armature 52, which is a movable iron plate, is connected to the upper side of the side plate portion 46, the upper portion of the movable contact terminal 51 is fixed to the armature 52, the armature 52 faces the upper plate portion 50a of the core 50, and the movable contact point. 51a faces the fixed contact 53a of the fixed contact terminal 53 on the coil, and the fixed contact terminal 53 is extended downward (the lower terminal portion is indicated by reference numeral 53b) and connected to an external bus bar (not shown). The coil 49 is connected to the coil terminal 54, the coil terminal 54 is extended downward (the lower terminal portion is indicated by reference numeral 54a), and the lower extension 51a of the movable contact terminal 51 is horizontal. It is connected to the bus bar 55 parts.

  In Patent Document 1, in addition to the heat radiating member 47, a plate-like heat radiating member 56 bent along the bottom plate portion 45 of the stationary 44 is extended below the movable contact terminal 51 as shown by a chain line in FIG. It is also described that the heat of the stationary 44 is radiated from the movable contact terminal 51 to the bus bar 55 via the heat radiating member 56.

In Patent Document 1, the lower end of the core 50 is inserted in the state where the lower end portion of the core 50 is inserted into the hole portion of the bottom plate portion 45 of the stationery 44 and the heat radiating member 47 is in contact with the bottom plate portion 45. Also described is a structure fixed by a not-shown) or a structure in which a plate-like heat radiating member (not shown) is brought into contact with the upper plate portion 50a of the core 50 and the heat radiating member is fixed to the bus bar 55 for connecting the movable contact terminal. Has been.
Japanese Unexamined Patent Publication No. 2004-134140 (FIGS. 1, 5, 8, and 12)

  However, in the conventional heat dissipation structure of the electromagnetic relay, a separate heat dissipation member 47 must be joined to the electromagnetic relay 41 by welding or the like, or the movable contact terminal 51 must be processed to form the heat dissipation member 56. In other words, there is a problem that it is costly to dispose the heat radiating members 47 and 56, and there is a problem that it takes time and cost to connect the heat radiating members 47 and 56 to the external bus bars 48 and 55.

  In view of the above-described points, an object of the present invention is to provide an electromagnetic relay heat dissipation structure that can reliably reduce the heat of an electromagnetic relay at low cost without using a separate heat dissipation member.

  In order to achieve the above object, a heat dissipation structure for an electromagnetic relay according to claim 1 of the present invention is provided with a recess on the bottom side of a bottom plate portion of a stationary which is a yoke of the electromagnetic relay, and a core at the center of the coil is provided on the bottom plate portion. The core fixing portion on the lower end side of the core is accommodated in the recess, and the bottom surface of the bottom plate portion is in surface contact with an external circuit body.

  With the above configuration, the heat of the stationary is directly radiated to the external circuit body, the temperature of the stationary and the subsequent core, coil, and movable contact terminal is lowered, and harmful heating is prevented.

  In the heat dissipation structure for an electromagnetic relay according to claim 2, the core in the center of the coil is passed through the bottom plate portion of the stationery which is the yoke of the electromagnetic relay, and the core fixing portion on the lower end side of the core is disposed on the bottom surface side of the bottom plate portion. A concave portion is provided in an external circuit body, the core fixing portion is accommodated in the concave portion, and the bottom surface of the bottom plate portion is in surface contact with the circuit body.

  With the above configuration, the heat of the stationary is directly radiated to the external circuit body, the temperature of the stationary and the subsequent core, coil, and movable contact terminal is lowered, and harmful heating is prevented.

  A heat dissipation structure for an electromagnetic relay according to a third aspect is the heat dissipation structure for an electromagnetic relay according to the first or second aspect, wherein the bottom surface of the core fixing portion is in surface contact with the circuit body.

  With the above configuration, for example, when the heat of the core is as high as that of the stationery, the heat dissipation effect is promoted by bringing the stationery and the core fixing portion into contact with the circuit body at the same time.

  A heat dissipation structure for an electromagnetic relay according to a fourth aspect is the heat dissipation structure for an electromagnetic relay according to any one of the first to third aspects, wherein the bottom plate portion of the stationery is exposed to the outside from the outer case.

  By the said structure, a baseplate part and its lower circuit body are cooled by external temperature, and the thermal radiation effect increases.

  According to the first aspect of the present invention, the heat of the electromagnetic relay is reliably reduced at low cost by directly contacting the stationary terminal of the electromagnetic relay with the external circuit body without using a conventional heat radiating member. be able to.

  According to the second aspect of the present invention, the heat of the electromagnetic relay can be reliably reduced at low cost by directly bringing the stationary station of the electromagnetic relay into contact with an external circuit body without using a conventional heat radiating member. be able to.

  According to the third aspect of the present invention, for example, when the heat of the core is as high as that of the stationery, the heat dissipation effect can be promoted by bringing the stationery and the core fixing portion into contact with the circuit body at the same time.

  According to the fourth aspect of the present invention, the bottom plate portion of the stationery is cooled by the outside air, so that the heat radiation effect of the electromagnetic relay is enhanced, and the effects of the first to third aspects of the invention are promoted.

  FIG. 1 shows an embodiment of a heat dissipation structure for an electromagnetic relay according to the present invention.

  This structure is such that the lower half side of the bottom plate portion 3 of the L-shaped stationery 2 that is an iron yoke of the electromagnetic relay 1 is exposed below (outside) the lower end of the outer casing 5 made of insulating resin. The lower surface (bottom surface) 3a of the bottom plate portion 3 is brought into contact (close contact) with the upper surface of the circuit body 6, and a concave space 7 is formed in the bottom plate portion 3 upward from the lower surface 3a. The side plate-like core fixing part 9 is accommodated, and the heat of the stationery 2 is transmitted from the bottom surface 3a of the bottom plate part 3 to the circuit body 6 and diffused from the circuit body 6 to the outside air.

  In FIG. 1, reference numeral 4 is a vertical side plate portion of the stationery 2, 10 is an armature that is an iron piece rotatably connected to the upper side of the side plate portion 4, and 11 is an outer surface of the side plate portion 4 and the armature 10. A fixed conductive metal spring-type movable contact terminal, 8 is a rod-shaped core that is a magnetic iron core standing from the bottom plate portion 3 of the stationery 2, and 12 is a conductive metal wire wound around the core 8. , 13 is a vertical fixed contact terminal, 14 is a movable contact provided at the tip of the movable contact terminal 11, 15 is a fixed contact provided at the tip of the fixed contact terminal 13, and 16 is an automobile battery. A power source 17 and the like 17 respectively indicate loads of electrical components and the like.

  The circuit body 6 may be a circuit board or a bus bar. The circuit board is a printed circuit formed on the surface of an insulating substrate, and the bus bar is a strip or plate made of conductive metal. The circuit body 6 is disposed on an insulating base 18.

  When the coil 12 is energized, the plate-like upper end 19 of the core 8 attracts the armature 10 together with the movable contact terminal 11, the movable contact 14 contacts the fixed contact 15, and the circuit body 6 from the power supply 16. The load current flows as shown by the arrow on the load 17 side through the contact terminals 11 and 13 and the circuit body 20 on the fixed contact terminal side.

  As shown in FIG. 2, the heat transfer mechanism of the electromagnetic relay 1 causes the coil 12 to generate heat when the coil 12 is energized, and the heat is transferred to a coil terminal (not shown). Further, when the coil 12 is energized, magnetism is generated, the magnetic circuit generates heat, and the heat is transferred to the contact circuits 11 and 13. The stationary circuit 2, the core 8, and the armature 10 constitute a magnetic circuit, and the temperature rise in these portions is the highest.

  FIG. 3 shows the results of measuring the temperatures of the bottom surface portion 3 a, the movable contact terminal 11, and the coil 12 of the stationery 2. In FIG. 3, the vertical axis represents temperature and the horizontal axis represents current (the numerical values are omitted). As for the temperature of each part, the bottom surface part 3a of the stationary 2 is the highest, the movable contact terminal 11 is the second highest, and the coil 12 is the lowest. The stationary 2 that is in contact with both the movable contact terminal 11 and the coil 12 (core 8) particularly generates heat.

  Therefore, it is important to lower the temperature of the electromagnetic relay 1 to dissipate the bottom surface portion 3a of the stationary 2 and the bottom plate portion 3 of the stationary 2 is directly brought into contact with the circuit body 6 in a wide area as shown in FIG. Dissipating heat is extremely effective.

  In the example of FIG. 1, the core fixing portion 9 on the lower end side having a larger diameter than the core (core body) 8 is connected to the bottom plate portion 3 with the lower portion 8 a of the core 8 passing through the hole portion 21 of the bottom plate portion 3 of the stationary 2. The upper surface 9 a of the core fixing portion 9 is closely attached to the upper surface of the concave portion 7, and the lower surface (bottom surface) 9 b of the core fixing portion 9 is positioned above the bottom surface 3 a of the bottom plate portion 3. Thus, there is a gap between the lower surface 9 b and the circuit body 6 so that the core fixing portion 9 is not in contact with the circuit body 6.

  The upper end portion 19 of the core 8 is formed with a larger diameter than the core fixing portion 9 at the lower end, and sucks the armature 10. For example, the upper end portion 19 or the core fixing portion 9 on the lower end side of the core 8 is formed separately from the core (core main body) 8 and is fixed to the core (core main body) 8 by screwing, welding, or the like and integrated. The circuit bodies 6 and 20 are separated into a stationary side (movable contact terminal side) and a fixed contact terminal side.

  Note that the bottom surface 9b of the core fixing portion 9 may be brought into surface contact with the circuit body 6 and fixed by soldering or the like. Even in this case, the bottom surface 9b of the core fixing portion 9 is prevented from projecting downward from the bottom surface 3a of the stationary 2 and firstly, the bottom surface 3a of the stationary 2 is brought into close contact with the circuit body 6 by surface contact.

  As shown in FIG. 3, since the temperature of the coil 12 is not so high, it is more effective for heat dissipation to contact the stationery 2 itself to the circuit body 6 than to contact the core 8 to the circuit body 6. By disposing the core fixing portion 9 in the recess 7, adhesion between the stationery 2 and the circuit body 6 is ensured.

  When the temperature of the core 8 becomes as high as that of the stationery 2, it is effective to bring the bottom surface 9 b of the core fixing portion 9 into contact with the circuit body 6 together with the bottom surface 3 a of the bottom plate portion 3 of the stationery 2. In this case, the bottom surface 9b of the core fixing portion 9 is preferably solder-connected to a circuit portion of a bus bar or a circuit board that is the circuit body 6 on the movable contact terminal 11 side.

  FIG. 4 shows another embodiment of the heat dissipation structure of the electromagnetic relay 1 ′, in which the recess 7 is not provided in the bottom plate portion 3 of the stationery 2, the recess 22 is provided in the circuit body 6, and a plate-like core is provided in the recess 22. The structure which accommodated the fixing | fixed part 9 is shown. Parts similar to those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The circuit body 6 is preferably a thick circuit board rather than a bus bar. The recess 22 is integrally formed or processed on the insulating substrate made of insulating resin of the circuit board. A gap is formed between the inner surface of the recess 22 and the core fixing portion 9 so that the core fixing portion 9 does not contact the circuit board 6. The top surface 9 a of the core fixing part 9 is in close contact with the bottom surface 3 a of the stationery 2.

  The lower portion 8 a of the core 8 passes through the hole portion 21 of the bottom plate portion 3 of the stationery 2. Since the upper end surface 8 b of the core 8 is formed to have the same diameter as the core (core body) 8, the large-diameter core fixing portion 9 can be formed integrally with the core 8 and is fixed to the bottom plate portion 3 of the stationery 2. . In FIG. 4, reference numeral 10 denotes an armature, and other configurations are the same as in the example of FIG.

  In the embodiment of FIG. 4 as well, the core fixing portion 9 can be brought into surface contact (solder connection or the like) with the conductive circuit portion of the circuit body 6. Solder connection is not an electrical connection but for heat dissipation.

  FIG. 5 shows a heat dissipation structure (detailed example) of an electromagnetic relay 1 ″ similar to the embodiment of FIG. 1 (FIG. 5 (a) is a longitudinal sectional view, and FIG. 5 (b) is a back view). 1 are assigned the same reference numerals, and detailed description thereof is omitted.

  In FIG. 5, reference numeral 12 is a coil, 8 is a core in the center of the coil, 2 is an L-shaped stationery, 10 is an armature, 11 is a movable contact terminal, 13 is a fixed contact terminal, and 23 is a coil terminal. Reference numeral 5 denotes an exterior case, and reference numeral 24 denotes a base portion of the case 5.

  A disk-shaped core fixing part 9 is formed on the lower end side of the core 8, a rectangular concave part 7 is provided in the bottom plate part 3 of the stationery 2, the core fixing part 9 is accommodated in the concave part 7, and the core fixing part 9 The lower surface 9b of the base plate part 3 is located on the same plane as the lower surface 3a of the bottom plate part 3 or slightly above the lower surface 3a of the bottom plate part 3, and the bottom plate part 3 is exposed to the outside in the inner space 24a of the base part 24. Can be brought into close contact with the circuit body 6 (FIG. 1) by surface contact.

  The fixed contact terminal 13 is extended from top to bottom, the lower end portion 13a of the fixed contact terminal 13 is located on the same plane as the bottom plate portion 3 of the stationery 2, and the circuit body 20 (FIG. 1) is placed on the peripheral wall 5a side of the case 5. Connected to the battery 16 (this is different from the example of FIG. 1), the pair of coil terminals 23 are located on the same plane as the bottom plate 3, and the circuit body 6 (FIG. 1) on the peripheral wall 5a side of the case 5. ) To the battery 16 ′ and the switch 25. The movable contact terminal 11 is connected to the load 17 through the stationery 2 (this is different from the example of FIG. 1).

It is a longitudinal cross-sectional view which shows one Embodiment of the thermal radiation structure of the electromagnetic relay which concerns on this invention. It is explanatory drawing which shows the mechanism of the heat transfer of an electromagnetic relay. It is a graph which shows the temperature of each part of an electromagnetic relay. It is a longitudinal cross-sectional view which shows other embodiment of the thermal radiation structure of an electromagnetic relay. The similar detailed example of the heat dissipation structure of an electromagnetic relay is shown, (a) is a longitudinal cross-sectional view, (b) is a bottom view. It is a longitudinal cross-sectional view which shows one form of the heat dissipation structure of the conventional electromagnetic relay.

Explanation of symbols

1, 1 ', 1 "Electromagnetic Relay 2 Stationary 3 Bottom Plate 3a, 9b Bottom 5 Exterior Case 6 Circuit Body 7, 22 Recessed 8 Core 9 Core Fixed 12 Coil

Claims (4)

  A concave portion is provided on the bottom side of the bottom plate portion of the stationery which is a yoke of the electromagnetic relay, the core at the center of the coil is passed through the bottom plate portion, and the core fixing portion on the lower end side of the core is accommodated in the concave portion. A heat dissipation structure for an electromagnetic relay, characterized in that the bottom surface of the relay is in surface contact with an external circuit body.   A core at the center of the coil is passed through the bottom plate portion of the stationary station, which is a yoke of the electromagnetic relay, the core fixing portion on the lower end side of the core is disposed on the bottom surface side of the bottom plate portion, and a recess is provided in an external circuit body. A heat dissipation structure for an electromagnetic relay, wherein the core fixing portion is accommodated in a surface, and the bottom surface of the bottom plate portion is brought into surface contact with the circuit body.   The heat dissipation structure for an electromagnetic relay according to claim 1 or 2, wherein a bottom surface of the core fixing portion is brought into surface contact with the circuit body.   The heat dissipation structure for an electromagnetic relay according to claim 1, wherein a bottom plate portion of the stationery is exposed to the outside from an exterior case.

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