JP4380484B2 - Reactor device - Google Patents

Description

  The present invention relates to a reactor device, and more particularly to a heat dissipation structure thereof.

  The reactor is used, for example, in a DC chopper circuit to store and release the energy of a DC power source, and is formed by winding a coil around an annular core made of a magnetic material. If it generates heat during operation and the temperature rises beyond the limit due to heat generation, the stability of the reactor operation is impaired. Therefore, a heat dissipation structure may be added to the reactor in order to suppress the temperature rise.

In the conventional reactor shown in FIG. 7 (see Patent Document 1), the reactor 100 includes a core 101 and a coil 102. The heat dissipation structure 105 includes an upper housing 107, a pair of side housings 110, and a heat sink 117. The upper housing 107 is provided above the core 100 and includes heat radiating fins 101. Each side housing 110 sandwiches the reactor 101 from both sides, has a coil heat radiating portion 112 and a core heat radiating portion 114, and is erected on a plate-shaped heat sink 117. Heat generated in the core 101 and the coil 102 is conducted to the heat sink 117 via the pair of side housings 110 and is radiated by the heat sink 117.
JP 2002-50527 A

  However, the conventional example has room for improvement in the following points. First, the core 101 and the coil 102 which are heat generation sources are separated from the cooling fins 108 and the heat sink 117 which are heat dissipation means, and it is difficult to say that the cooling efficiency is good. Further, in addition to the upper housing 107 and the heat sink 117, they are arranged in a pair of side housings 110 that have almost no heat dissipation action, and the number of parts of the heat dissipation structure is increased and the structure is complicated. Furthermore, no positive heat dissipation means is provided in the hollow hole of the core 101 where heat is difficult to escape, and the temperature of the inner peripheral surfaces of the core 101 and the coil 102 is likely to rise.

  This invention is made | formed in view of the said situation, and it aims at providing the reactor apparatus which can radiate | emit the heat | fever in the hollow hole of the core where temperature rises easily through a case.

  The inventor of the present application has a heat conduction part that enters the hollow hole of the core around which the coil is wound and conducts heat of the inner peripheral surface to the lower wall part and / or the upper wall part of the case in a part of the case. The present invention was completed with the idea of providing it.

  The reactor device according to the present invention includes an annular core, a coil wound around the core, a lower wall portion covering the lower surface of the core, a peripheral wall portion covering the outer peripheral surface of the core, and an upper surface of the core. And a case having a heat conducting portion extending from the upper wall portion, the lower wall portion and / or the upper wall portion and entering the hollow hole of the core.

In this reactor device, the heat of the lower surface, outer peripheral surface, and upper surface of the core and coil is conducted to the lower wall portion, the peripheral wall portion, and the upper wall portion, respectively. Moreover, the heat of the inner peripheral surface is conducted to the lower wall portion and / or the upper wall portion through the heat conducting portion. The heat is then dissipated from the case into the atmosphere. The case is composed of a lower case and an upper case, and the heat conducting part is formed on the lower wall part of the lower case and the upper wall part of the upper case, and the heat conducting part formed on the upper case has a constant cross-sectional shape. And a through hole is formed at the center thereof.

  According to the reactor device of the present invention, in addition to the heat of the lower surface, outer peripheral surface, and upper surface of the core and coil being conducted to the lower wall portion, the peripheral wall portion, and the upper wall portion of the case, the heat of the inner peripheral surface is also transmitted. Conducted from the heat conducting portion to the lower wall portion and / or the upper wall portion. As a result, the heat of the reactor is effectively radiated from the case, and the temperature rise of the reactor can be reliably prevented. Further, the case has a small number of parts and has a simple shape, so that the cost is low.

And according to the reactor apparatus concerning this invention, since the case was divided | segmented into the lower case and the upper case, formation of each wall part and accommodation of a reactor are easy. Furthermore, according to the reactor device according to the present invention, the heat conducting part with a through hole extending from the upper case can be used not only for the heat conduction of the inner peripheral surface of the core but also for the temperature detection member such as molten resin injection and thermistor. Can be used for insertion. According to the reactor device of the second aspect , heat is transmitted to the case from the core and the coil through the heat conductive and insulating resin, and the heat radiation action of the case is further improved.

  The reactor apparatus of this invention consists of a reactor and the case which accommodates a reactor.

(I) Reactor The reactor includes a core and a coil. The core is generally annular and includes a pair of coil winding portions (straight portions) that are separated from each other and a pair of connection portions (curving portions) that connect the coil winding portions.

(B) Case a. The entire case is made of a material having excellent thermal conductivity (for example, aluminum), and includes a lower wall portion, a peripheral wall portion, an upper wall portion, and a heat conductive portion as a whole. The lower wall portion covers the lower surface of the core, the peripheral wall portion covers the outer peripheral surface of the core, and the upper wall portion covers the upper surface of the core. The heat conducting portion extending from the lower wall portion and / or the upper wall portion enters the hollow hole of the core around which the coil is wound.

The lower wall portion, the peripheral wall portion and the upper wall portion may be formed in a single case, but in consideration of manufacturing convenience, an upper case made of aluminum or the like and a lower case made of aluminum, iron or copper, etc. in that make up the case. In this case, the lower wall portion is formed in the lower case and the upper wall portion is formed in the upper case. It is desirable that the peripheral wall portions (the pair of side wall portions and the pair of end wall portions) are formed in half in the lower case and the upper case. However, the peripheral wall portion can be formed only in the lower case, and in this case, the upper case functions as a cover.

b. Thermal Conductive Part The thermal conductive part extends upward from the central part of the lower wall part and / or downward from the central part of the upper wall part, and enters the hollow hole of the core. Both heat conducting parts can have the same shape or different shapes. The shape and position of the heat conducting part are determined in consideration of the shape and position of the hollow hole. Although the same horizontal cross-sectional shape is desirable over the entire length, it may be tapered as it advances to the tip. The cross-sectional shape may be rectangular or circular.

(C) Related matters The gap between the core and the coil and the case can be filled with a heat conductive and insulating resin (for example, silicon, urethane, etc.). The molten resin may be filled in the clearance of the lower case with the upper case removed, but a through hole is formed in the heat conducting part extending from the upper case, and the lower case is covered with the upper case. It can also be supplied through a hole. And after filling with resin, the temperature of the inner peripheral surface of the core in the case can be detected by inserting a thermistor into this through hole.

  Hereinafter, an embodiment (reactor device) of the present invention will be described with reference to the accompanying drawings.

<Example>
(Constitution)
The reactor device shown in FIGS. 1 and 2 includes a reactor 10 shown in FIG. 3 and a case 30 shown in FIGS. 2 and 4 (only the lower case is shown).

  As is apparent from FIG. 3, the core 12 of the reactor 10 has a track race shape as a whole, includes a pair of coil winding portions 14 and a pair of connecting portions 15, and has a rectangular cross section. Both coil winding portions 14 are parallel to each other and face each other at a constant interval. Both semicircular curved portions 15 connect the ends of both coil winding portions 14 to each other. A hollow hole 17 having a rectangular cross section and a uniform inner diameter is formed at the center, and penetrates in the height (thickness) direction.

  As is apparent from FIG. 3, the coil 20 is composed of a single coil, and the spiral portion 22 is spirally wound around the coil winding portion 14 of the core 10. As shown in FIG. 2, the one end 24 and the other end 25 are drawn upward from the upper case 42.

  As apparent from FIGS. 1 and 2, the case 30 includes a lower case 32 and an upper case 42, and both cases have a generally symmetric shape with respect to the dividing surface (mating surface) L. 50 configurations are different. More specifically, as shown in FIGS. 1, 2, and 4, the lower case 32 includes a lower wall portion 33, a pair of end wall halves 34, a pair of side wall halves 36, and a heat conducting portion 38. It is open. The heat conducting part 38 is formed in the center of the lower wall part 33 in parallel with the end wall half part 34 and away from the side wall half part 36, and has a rectangular cross section and the same cross section over the entire length. The hollow hole 17 enters from the lower opening and reaches the dividing surface of the lower case 32 and the upper case 42.

  On the other hand, as is clear from FIGS. 1, 2 and 4 (indicated by numbers with parentheses), the upper case 42 has an upper wall portion 43, a pair of end wall halves 44, and a pair of side wall halves 46. And the heat conduction part 50 and open downward. The end wall half portions 34 and 44 constitute an end wall portion 35, the side wall half portions 36 and 46 constitute a side wall portion 37, and the end wall portion 35 and the side wall portion 37 constitute a peripheral wall portion 45. .

  The heat conducting portion 50 extending downward from the upper wall portion 43 has a rectangular cross section, and the cross section has the same shape over the entire length. The cross-sectional shape of the tip is substantially equal to the thickness of the heat transfer portion 38 extending from the lower wall portion 33 of the lower case 32. The heat conduction part 50 is formed in the center of the upper wall part 43 in parallel with the end wall half part 44 and away from the side wall half part 46. The hollow hole 17 enters from the upper opening, and the tip of the hollow hole 17 reaches an intermediate part in the height direction of the hollow hole 17 and faces the heat conducting part 38 with a gap.

(Function)
Since the operation of the reactor 10 is known and is not directly related to the present invention, the description thereof is omitted. When the reactor 10 is operated, the core 12 and the coil 20 generate heat. The heat is transmitted from the core 12 and the coil 20 to the lower wall portion 33, the pair of end wall portions 35, the pair of side wall portions 37, and the upper wall portion 43 of the case 30, and is radiated to the atmosphere. The heat is also transferred from the heat conducting portions 38 and 50 to the lower wall portion 33 and the upper wall portion 43 and similarly dissipated.

(effect)
According to this embodiment, the following effects can be obtained. First, the heat of the core 12 and the coil 20 is efficiently radiated from the case 30. That is, the heat of the lower surface, outer peripheral surface, and upper surface of the core 12 and the coil 20 is transmitted to the lower wall portion 33, the peripheral wall portion 45, and the upper wall portion 43 that are close to or in contact with them, and the heat of the inner peripheral surface is transmitted to this It is transmitted to the heat conducting portions 38 and 50 that are in close proximity or in contact with each other. In particular, since the heat of the inner peripheral surface of the core 12, whose temperature is likely to rise, is conducted to the lower wall portion 33 and the upper wall portion 43 through the heat conducting portions 38 and 50, the temperature rise of the reactor 10 can be prevented.

  Second, the cost of the case 30 that functions as a heat dissipation member can be reduced. The reason is that the case 30 is composed of only two members, the lower case 32 and the upper case 42, and the number of parts is small. Moreover, the lower case 30 has only a lower wall portion 33, a pair of end wall half portions 34, a pair of side wall half portions 36, and a central heat conducting portion 36, and the upper case 42 has an upper wall portion 43, a pair of end walls. This is because it has only a half portion 44, a pair of side wall half portions 46, and a central heat conducting portion 50, all of which are simple in shape.

<Modification>
(1) First Modification In the first modification shown in FIG. 5, the gap between the core 12 and the coil 20 and the lower wall portion 33, the peripheral wall portion 45 and the upper wall portion 43 of the case 30 is thermally conductive and insulated. Resin 60 is filled. This is because the core 12 and the coil 20 are accommodated in the lower case 32 and the upper case 42, and after the molten resin is injected from the through hole 55 formed in the central portion of the heat conducting part 50 of the upper case 42, the solidification is performed. It has been made.

  According to this modification, in addition to the effects of the above embodiment, the heat dissipation action of the case 30 is further improved. This is because the heat of the core 12 and the coil 20 is directly conducted to the case 30 through the resin 60 having good thermal conductivity by filling the resin 60 in the gap. Moreover, the molten resin can be filled through the through hole 55 of the heat conducting portion 50 with the lower case 32 covered with the upper case 42, that is, the through hole can be used as a resin injection hole, so that the work efficiency is good.

(2) Second Modification In the second modification shown in FIG. 6, the thermistor 65 is inserted through the through hole 55 of the heat conducting unit 50, and the tip thereof reaches the center of the hollow hole 17 of the core 12. The thermistor 65 detects the temperature of the hollow hole 17, and the detected temperature is input to the CPU 70 via the lead wire 67. When the detected temperature rises beyond the limit value, or when the temperature above the predetermined value continues beyond the limit time, the energization of the coil 20 is stopped by the command from the CPU 70 and the reactor 10 is deactivated. And

  According to this modification, in addition to the effects of the above-described embodiment, the through hole 55 is used as an insertion hole for the thermistor 65 and the lead wire 67. Therefore, failure of the reactor 10 due to an abnormal temperature rise can be prevented. Can do.

It is front sectional drawing which shows the Example (reactor apparatus) of this invention. It is a perspective view of an Example. It is a perspective view which shows only the reactor of an Example. It is a top view of the lower case of an Example (it also corresponds to the bottom view of an upper case). It is explanatory drawing which shows a 1st modification. It is explanatory drawing which shows a 2nd modification. It is a perspective view which shows a prior art example.

Explanation of symbols

10: Reactor 12: Core 17: Hollow hole 20: Coil 22: Spiral part 30: Case 32: Lower case 33: Lower wall part 35: End wall part 37: Side wall part 43: Upper wall part 50: Heat conduction part 55: Through hole 60: Resin 65: Thermistor

Claims (2)

An annular core (12);
A coil (20) wound around the core;
A lower wall portion (33) covering the lower surface of the core, a peripheral wall portion (45) covering the outer peripheral surface of the core, an upper wall portion (43) covering the upper surface of the core, and the lower wall portion and / or the upper wall A case (30) having a heat conducting part (38, 5) extending from the part and entering the hollow hole of the core,
Conducting the heat of the inner peripheral surface of the core to the lower wall part and / or the upper wall part through the heat conducting part,
The case includes a lower case (32) and an upper case (42), and the heat conducting portion is formed on the lower wall portion of the lower case and the upper wall portion of the upper case,
Wherein on the heat conducting portion formed on the case has a cross section constant shape, a reactor apparatus according to claim Rukoto through hole (55) is formed at the center thereof. Reactor apparatus according to claim 1, thermal conductivity and insulating resin (60) is filled in the gap between the core and the coil and the case.

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