JP4192826B2 - Reactor with cooler - Google Patents

Description

  The present invention relates to a reactor with a cooler provided with a cooler that suppresses a temperature rise due to heat generation.

  The reactor stores and discharges the energy of a direct current power source in a DC-DC converter, for example, and is formed by winding a coil around a 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 cooler may be added to the reactor to suppress the temperature rise.

For example, in the conventional reactor with a cooling device shown in FIG. 3 (see Patent Document 1), the reactor 80 includes a core 81 and a coil 82. The cooling device 85 includes an upper housing 87, a pair of side housings 90, and a heat sink 97. The upper housing 87 is placed over the reactor 80 and includes heat radiation fins 88. Each side housing 90 sandwiches the reactor 80 from both sides, has a coil cooling part 92 and a core cooling part 94, and is erected on a plate-shaped heat sink 97.
JP 2002-50527 A

  The conventional example employs an air cooling system in which heat generated in the core 81 and the coil 82 is transmitted to the heat sink 97 via the pair of side housings 90 and radiated by the heat sink 97. However, the side housing 90 and the heat sink 97 are separate members, and the thermal resistance existing at the interface between the two prevents the heat transfer from the side housing 90 to the heat sink 97. Further, the core 81 and the coil 82 which are heat generation sources are separated from the cooling fins 88 and the heat sink 97 which are heat dissipation means, and it is difficult to say that the cooling efficiency is good. Furthermore, the arrangement of the pair of side housings 90 having almost no heat dissipation action increases the number of parts of the cooling device and complicates the structure.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a reactor with a cooler having a cooler with a small number of parts and a simple structure and good cooling efficiency.

The inventor of the present application has conceived that the cooling water is circulated in a portion close to the core and the coil after the cooler is integrated, and the present invention has been completed.
A reactor with a cooler according to the present invention , as described in claim 1 ,
A bottom wall portion, a peripheral wall portion, and a partition wall portion that divides the storage space defined by the bottom wall portion and the peripheral wall portion into a plurality of storage portions are integrally formed, and the bottom wall portion has a water channel through which cooling water circulates. A cooler equipped with,
The first bottom wall portion, the first peripheral wall portion, and the first storage portion partitioned by the partition wall portion are accommodated, the lower surface is the first bottom wall portion, and the outer surface is the first peripheral wall portion and the partition wall portion. Each reactor in close contact ,
It consists of the 2nd bottom wall part, the 2nd surrounding wall part, and the electronic component accommodated in the 2nd accommodating part divided by the said partition wall part.

  In this reactor with a cooler, the heat generated in the reactor and the electronic components is transmitted to the first bottom wall portion and the second bottom wall portion of the cooler and is cooled with water by the cooling water, and the first peripheral wall portion and the second peripheral wall. It is transmitted from the part to the bottom wall part and similarly water-cooled.

According to the reactor with a cooler according to the present invention , the first bottom wall portion and the first bottom wall portion from the reactor and the electronic component due to the close contact between a part of the reactor and the electronic component and the first bottom wall portion and the second bottom wall portion of the cooler. Heat is reliably transmitted to the second bottom wall, heat exchange is performed with the cooling water circulating in the water channel, and the temperature rise of the reactor and the electronic component is prevented. Further, since the first bottom wall portion and the second bottom wall portion of the cooler, the first and second peripheral wall portions and the partition wall portion are integrally formed, there is no thermal resistance between them, and the first peripheral wall portion and Heat is effectively transferred from the second peripheral wall portion and the partition wall portion to the first bottom wall portion and the second bottom wall portion. Furthermore, the first and second bottom wall portions, the first and second peripheral wall portions, and the partition wall portion also serve as a reactor and electronic component housing means and heat transfer and heat dissipation means, and the structure is compact. It is.

According to the reactor with a cooler according to claim 2 , the partition wall portion includes a first extension portion extending from the side wall and a second extension portion extending from the end wall, and the first housing portion is smaller than the second housing portion. Therefore, it is suitable for housing a reactor having a size (width) different from that of the electronic component, and heat transfer from the first housing portion to the second housing portion is prevented. According to the reactor with a cooler of the third aspect , since the lower surface of the U-shaped core of the reactor is in close contact with the first bottom wall portion, heat is easily transferred from the lower surface to the first bottom wall portion. According to the reactor with a cooler of the fourth aspect , since the outer surface of the core is in close contact with a part of the first peripheral wall portion and the partition wall portion, heat is easily transferred from the outer surface to the first peripheral wall portion.

(A) Applications A reactor with a cooler is used for boosting or stepping down a DC voltage in a DC-DC converter, or as a smoothing filter for a power supply circuit.
(B) First Type In the first type of reactor-equipped reactor cooler, the bottom wall portion and the peripheral wall portion along the outer periphery thereof are integrally formed (having an integral structure). Here, “integral formation” means that the same material is formed simultaneously and seamlessly. Shape of the bottom wall portion and the peripheral wall is Ru KOR in relation to the shape of the reactor. The bottom wall portion is provided with a water channel through which cooling water circulates, waterways it is desirable to form the entire lower surface of the bottom wall portion may be formed only in a specific region. An outer peripheral wall is formed in the outer periphery of a bottom wall part, for example, has a rectangular shape. The outer peripheral wall is preferably formed in an annular shape over the entire circumference, but a part of it may be cut off.

Reactor is housed in a compartmented inner space between the bottom wall and the peripheral wall portion, a part thereof that has been in close contact with the bottom wall portion. For example, placed sideways reactor comprising a core of U-shaped, are brought into close contact with the lower surface of the core to the bottom wall, it can be adhered to the outer surface to the peripheral wall.
(C) Second type The cooler of the reactor with the second type of cooler has a bottom wall part, a peripheral wall part along the outer periphery thereof, and a partition wall part that partitions an accommodation space defined by the bottom wall part and the outer peripheral wall part. Are integrally formed. A peripheral wall part is formed in the outer periphery of a bottom wall part, for example, contains a pair of side wall part and a pair of end wall part, and has a rectangular frame shape. The meaning of “integral formation” is as described above. The partition wall partitions the storage space into a plurality of storage portions. A reactor is accommodated in a certain accommodating part, and an electronic component is accommodated in another accommodating part (one or more). The shapes of the bottom wall portion, the peripheral wall portion, and the partition wall portion are determined by the relationship with the shape of the reactor and the electronic component.

Partition walls may consist of a second extension portion extending from the first extension portion and an end wall extending from the side wall (claim 2). The 1st bottom wall part and 2nd bottom wall part which a reactor adheres are provided with a circulation channel on the undersurface.

The reactor is housed in a first housing section defined by a first bottom wall portion, a first peripheral wall portion, and a partition wall portion. A part thereof is in close contact with the first bottom wall part, and a part thereof is in close contact with the first peripheral wall part and the partition wall part ( claims 3 and 4 ). The electronic component is housed in a second housing section defined by the second bottom wall portion, the second peripheral wall portion, and the partition wall portion. It is desirable that a part (bottom surface) thereof is in close contact with or close to the second bottom wall portion, and an outer surface thereof is in close contact with or close to the second peripheral wall portion and the partition wall portion.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
(Constitution)
As shown in FIGS. 1 and 2, the reactor 10 includes a U-shaped core 12 and a coil 15 wound around the core 12. The pair of arm portions 13a and 13b of the core 12 has a rectangular cross section, and is arranged (sideways) so that the direction connecting both the arm portions 13a and 13b is the horizontal direction. A coil 15 is wound around each arm 13.

  The entire cooler 20 is made of aluminum having excellent heat transfer properties and has an integral structure. A rectangular bottom wall portion 22, a pair of side wall portions 24a and 24b rising at right angles from both sides thereof, a pair of end wall portions 26a and 26b rising at right angles from both ends of the bottom wall portion 22, and a partition wall Part 31. The pair of side wall portions 24a and 24b are formed over the entire length of the side portion of the bottom wall portion 22, and the pair of end wall portions 26a and 26b are formed over the entire length of the end portion of the bottom wall portion 22, and their heights are equal. As a result, a square frame-shaped peripheral wall portion 25 is formed along the outer peripheral edge of the bottom wall portion 22.

  In the partition wall portion 31, an extension portion 32 extending from the middle of the other side wall portion 24 and an extension portion 33 extending from the middle of the one end wall portion 26a intersect at a right angle. The first bottom wall portion 23a, the extension portions 32 and 33, the part 24b1 of the other side wall portion 24b, and the one end wall portion 26a jointly define a rectangular parallelepiped reactor containing space 35. The shape and size of the storage space 35 are substantially equal to the shape and size of the reactor 10. As a result, the outer surface 13a1 of the one arm portion 13a of the reactor 10 is the one end wall portion 26a, the outer surface 13b1 of the other arm portion 13b is the extension portion 32, and the lower surfaces 13c of both the arm portions 13a and 13b are the first. It is in contact with the bottom wall portion 23a.

  The second bottom wall portion 23b, the extension portion 32, the remaining portions 24a2 and 24b2 of both side wall portions 24a and 24b, and the other end wall portion 26b define a rectangular parallelepiped electronic component housing space 37. The housing space 37 is larger than the reactor housing space 35, and an electronic component (for example, a power transistor) 38 is housed therein.

As can be seen from FIG. 2, a cooling water circulation channel 40 is formed on the entire bottom surface (back surface) of the bottom wall portion 22. That is, a large number of ribs 41 extending downward from the lower surface of the bottom wall portion 22 are formed at regular intervals, and a small space 42 is defined between adjacent ribs 41. A lid member 45 on which a number of upward ribs 44 are formed covers the bottom wall portion 22. The width of the ribs 44 of the lid member 45 and the interval of the small spaces 46 between the ribs 44 are the same as those of the ribs 41 and the small spaces 42 of the bottom wall portion 22, and are composed of a number of spaces 42 and 46 communicated with each other. A circulation channel 40 is formed.
(Function)
In this reactor with a cooler, heat generated in the core 12 and the coil 15 when the reactor 10 is operated is transmitted from the bottom wall portion 22 of the cooler 20 to the ribs 41 and 44. Heat is exchanged between the cooling water circulating through the circulating water passage 40 on the lower surface of the bottom wall portion 22 and the ribs 41 and 44 (water cooling method), and the temperature of the reactor 10 is prevented from rising. Similarly, heat exchange is similarly performed between the heat generated in the electronic component 38 and the cooling water, and the electronic component 38 is cooled.

Further, the heat of the reactor 10 is transmitted to the bottom wall portion 22 through a part 24b1 of the other side wall portion 24b and the one end wall portion 26a, and is cooled with cooling water. Similarly, the heat of the electronic component 38 is transmitted to the bottom wall portion 22 through the remaining portion 24a2 of the one side wall portion 24a, the remaining portion 24b2 of the other side wall portion 24b, and the other end wall portion 26b, and is cooled with water.
(effect)
According to the reactor with a cooler of this embodiment, the following effects can be obtained. First, the cooling efficiency of the reactor 10 is good for three reasons. The first reason is that the lower surface 13 c of the reactor 10 is in close contact with the bottom wall portion 22, and the outer surfaces 13 a 1 and 13 b 1 are in close contact with the peripheral wall portion 25 and part of the partition wall portion 31. Thereby, the heat generated in the core 12 and the coil 15 is transmitted directly from the lower surface 13c to the bottom wall portion 22, and from the outer surfaces 13a1 and 13b1 directly to the one end wall portion 26a and the extension portion 32.

  The second reason is that there is no interface between the bottom wall portion 22 and the peripheral wall portion 25 of the cooler 20. That is, the bottom wall portion 22, the side wall portions 24a and 24b, and the end wall portions 26a and 26b are all formed of the same material, and since there is no joint between them, the thermal resistance is low. Therefore, heat transfer from the peripheral wall portion 25 and the partition wall portion 31 to the bottom wall portion 22 is good.

  The third reason is the adoption of the water cooling method. The heat transmitted directly from the lower surface 13c of the reactor 10 to the bottom wall portion 22 and the heat transmitted from the outer surfaces 13a1 and 13b1 of the reactor 10 to the bottom wall portion 22 via the peripheral wall portion 25 and the partition wall portion 31 are Cooling is effectively performed by the cooling water flowing through the circulating water passage 40 below the section 22.

  Second, the partition wall 31 prevents heat from the relatively high temperature reactor 10 from being transmitted to the low temperature electronic component 38. The reactor 10 generates a larger amount of heat than the electronic component 38, and the temperature is likely to rise. However, since the partition wall portion 31 serves as a barrier to block heat transfer from the accommodation space 35 to 37, the temperature of the electronic component 38 is prevented from rising due to the heat of the reactor 10.

  Third, the number of parts of the cooler 20 is small and the structure is simple. This is because the bottom wall portion 22 and the peripheral wall portion 25 of the cooler 20 partition the receiving spaces 35 and 37 of the reactor 10 and the electronic component 28 and transmit heat.

It is a disassembled perspective view which shows the Example of this invention. It is 2-2 sectional drawing in the state which accommodated the reactor in the cooler in FIG. It is a disassembled perspective view of a prior art example.

Explanation of symbols

10: Reactor 12: Core 15: Coil 20: Cooler 22: Bottom wall part 24a, 24b: Side wall part 25: Peripheral wall part 26a, 26b: End wall part 31: Partition wall part 35, 37: Accommodating space

Claims (4)

A bottom wall portion, a peripheral wall portion, and a partition wall portion that divides the storage space defined by the bottom wall portion and the peripheral wall portion into a plurality of storage portions are integrally formed, and the bottom wall portion has a water channel through which cooling water circulates. A cooler equipped with,
The first bottom wall portion, the first peripheral wall portion, and the first storage portion partitioned by the partition wall portion are accommodated, the lower surface is the first bottom wall portion, and the outer surface is the first peripheral wall portion and the partition wall portion. Each reactor in close contact ,
An electronic component housed in a second housing section partitioned by a second bottom wall section, a second peripheral wall section and the partition wall section;
The reactor with a cooler characterized by comprising. The partition wall portion includes a first extension portion that extends from the middle of the side wall of the peripheral wall portion and a second extension portion that extends from the middle of the end wall, and the first housing portion is more than the second housing portion. The reactor with a cooler of Claim 1 small. The reactor with a cooler according to claim 1 , wherein the reactor includes a U-shaped core and a coil wound around the core, and a lower surface of the core is in close contact with the first bottom wall portion. The reactor with a cooler according to claim 3 , wherein the first peripheral wall portion and the partition wall portion have a shape corresponding to the reactor, and an outer surface of the core is in close contact with the first peripheral wall portion and the partition wall portion. .

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