JP2013229433A - Heating device with cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating device with a cooler that reduces the parts count and has a simple configuration and improved cooling efficiency.SOLUTION: In a heating device with a cooler, a cast cooling member 10 is in the shape of a bottomed quadrangular cylinder, and houses a transformer 1. The cast cooling member 10 has: a core cooling surface 14a that faces a core 3; and a coil cooling surface 14b that is integral with the core cooling surface 14a and faces coils 2a and 2b. An entire bottom surface of the cast cooling member 10 is in surface contact with a cooler surface 8 of a cooler 7.

Description

  The present invention relates to a heat generator with a cooler in which a heat source is attached to a cooler via a relay member.

  For example, in an electromagnetic device in which a coil is wound around a magnetic core via a bobbin, the core and the coil generate heat during operation, and if their temperature exceeds an allowable value, the electromagnetic device Operation becomes unstable.

Conventionally, as a means for suppressing the temperature rise of the core and the coil, the coil cooling part having the coil facing surface that faces the outer peripheral surface of the coil and takes heat from the coil, and faces the side of the short part of the core An electromagnetic device including a side housing including a core cooling unit having a core facing surface that takes away heat from the core is known (for example, see Patent Document 1).
In this electromagnetic device, the side housing is fixed to the heat sink, and the heat taken from the coil and the core is transmitted to the heat sink through the side housing.

Japanese Patent Laid-Open No. 2002-50527 (FIG. 4)

However, the electromagnetic device has a problem that heat taken from the coil and the core through the pair of side housings facing each other is transmitted to the heat sink through the side housing, and the number of parts is large and the structure is complicated. there were.
Further, each side housing is erected with respect to the heat sink, and there is a problem that the contact area between each side housing and the heat sink is small, and the cooling efficiency is poor.

  An object of the present invention is to provide a heat generating apparatus with a cooler having a reduced number of members, a simple structure, and improved cooling efficiency. And

The heat generating device with a cooler according to the present invention is a heat generating device with a cooler in which a heat generating body having a first heat generating source and a second heat generating source is attached to the cooler via a heat conductive relay member. And
The relay member has a bottomed cylindrical shape in which the heating element is accommodated, and is integrated with the first heat generation facing surface portion facing the first heat generation source and the first heat generation facing surface portion. A second heat generation facing surface portion facing the heat generation source of 2;
The entire bottom surface is in surface contact with the cooler surface of the cooler.

According to the heat generating device with a cooler according to the present invention, the heat of the first heat generating source and the second heat generating source is transmitted to the cooler through the bottomed cylindrical relay member as one member, and the number of members Can be reduced, and the structure is simple.
In addition, since the entire bottom surface of the relay member is in surface contact with the cooler surface, the heat of the first heat source and the second heat source is efficiently transmitted to the cooler, and the cooling efficiency is improved.

It is a perspective view which shows the transformer apparatus with a cooler of Embodiment 1 of this invention. It is a disassembled perspective view which shows the transformer apparatus with a cooler of FIG. It is a cross-sectional perspective view of FIG. It is sectional drawing when it sees along the arrow A of FIG. It is a perspective view which shows the casting cooling member of FIG. It is a perspective view which shows the casting cooling member of the transformer apparatus with a cooler of Embodiment 2 of this invention. It is a perspective view which shows the casting cooling member of the transformer with a cooling device of Embodiment 3 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
1 is a perspective view showing a transformer device with a cooler according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view showing the transformer device with a cooler of FIG. 1, FIG. 3 is a sectional perspective view of FIG. FIG. 4 is a cross-sectional view when viewed along an arrow A in FIG. 3 and a perspective view showing the cast cooling member 10 in FIG. 1.
In the transformer device with a cooler of this embodiment, a transformer 1 which is a heating element and an electromagnetic device is attached to a water-cooled cooler 7 via a cast cooling member 10 which is a heat conductive relay member. .
The transformer 1 includes a core 3 that is a magnetic material, a primary coil 2a in which a copper wire that is a conductive wire is wound around the core 3 via a primary bobbin 9a that is an insulator, and an insulator on the outside of the primary coil 2a. And a secondary coil 2b around which a copper wire as a conducting wire is wound through a secondary bobbin 9b.
The core 3 is composed of a pair of U-shaped opposed core portions, and a gap is generated at the joint between the core portions. The core 3 that is the first heat generation source generates heat mainly due to hysteresis loss and eddy current loss.
The primary coil 2a and the secondary coil 2b generate magnetic flux when energized, and the core 3 forms a magnetic path. The primary coil 2a and the secondary coil 2b, which are the second heat generation sources, generate heat due to conduction loss.

The bottomed rectangular tube-shaped cast cooling member 10 is a cast product and is formed by aluminum die casting having high thermal conductivity.
The casting cooling member 10 includes a bottom wall surface portion 14, a pair of first sidewall surface portions 12a, a second sidewall surface portion 12b, and a first sidewall extending in the vertical direction from each peripheral edge portion of the bottom wall surface portion 14. There are a pair of stepped portions 15 formed opposite to each other at corners where the surface portion 12a and the bottom wall surface portion 14 intersect, and a bobbin fixing base 13 provided at both ends of the surface of the pair of stepped portions 15. doing.
The surface of the step portion 15 is a core cooling surface portion 14 a that is a first heat generation facing surface portion facing both side portions of the bottom surface of the core 3.
The intermediate portion of the bottom wall surface portion 14 is a second heat generation facing surface portion facing the entire surface of the secondary coil 2b, and is the coil cooling surface portion 14b.

A plurality of recesses are formed at both edge portions of the casting cooling member 10 including the side wall surface portion 12a and the step portion 15 at intervals along the edge portions. By forming this recess, a plurality of ribs 5a are provided between the recesses.
The rib 5a is formed by casting from the first side wall surface portion 12a during casting.
Since the cast hole is likely to occur at a location where the thickness of the casting changes rapidly, the thickness between the adjacent concave portions of the rib 5a is approximately the same as the thickness of the bottom wall surface portion 14.
A fixing part 20 of the secondary bobbin 9b is placed on the bobbin fixing base 13, and the transformer 1 is cast-cooled by tightening the fixing part 20 of the secondary bobbin 9b to the bobbin fixing base 13 using a fixing means. It is fixed to the member 10.
At this time, a gap of 1 mm is provided between the core 3 and the core cooling surface portion 14a and between the secondary coil 2b and the coil cooling surface portion 14b.

After the transformer 1 is housed in the casting cooling member 10, the potting agent 6 made of urethane resin is injected into the gap between the casting cooling member 10 and the transformer 1. The higher the thermal conductivity of the potting agent 6, the higher the cooling efficiency. In order to surely flow the potting agent 6 into the gap, it is desirable to evacuate.
As a result, heat exchange between the transformer 1 and the cast cooling member 10 becomes active, and heat dissipation efficiency is improved.

  The cooler 7 has a water channel 7a formed therein. Cooling water from the inlet pipe 21 flows into the water channel 7a and flows out from the outlet pipe 22 to the outside.

  The casting cooling member 10 containing the transformer 1 is placed on the cooler surface 8 of the cooler 7 after grease is applied to the bottom surface thereof, and the cast cooling member 10 is cooled using bolts (not shown). It is fixed to the vessel 7.

In the transformer device with a cooler having the above configuration, in order to ensure stable operation of the transformer 1, heat of the coils 2a, 2b and the core 3 must be released to the outside, and these temperatures must be cooled to an allowable value. .
By the way, in this transformer device with a cooler, the primary bobbin 9a and the secondary bobbin 9b of the insulator are provided between the core 3 and the primary coil 2a and the secondary coil 2b in order to ensure electrical insulation. Intervene. The primary bobbin 9a and the secondary bobbin 9b have a low thermal conductivity, and further sandwich an air layer between the core 3 and the primary bobbin 9a and between the primary coil 2a and the secondary bobbin 9b. The heat exchange between the coils 2a and 2b and the core 3 is hardly performed. Therefore, it is necessary to cool the coils 2a and 2b and the core 3 separately.

In this transformer device with a cooler, the heat of the core 3 is transferred from the rib 5a to the cooler 7 mainly through the first side wall surface portion 12a and the core cooling surface portion 14a which is the surface of the step portion 15.
The heat of the coil 2 is transferred from the coil cooling surface portion 14b to the cooler 7.
Each heat transmitted to the cooler 7 is heat-exchanged between the cooler 7 and water that is the refrigerant liquid, and is transported by the circulating water.
Further, the heat of the core 3 is released to the outside air through the rib 5a of the cast cooling member 10.

As described above, according to the transformer device with a cooler of this embodiment, the heat of the core 3 which is the first heat generation source and the coils 2a and 2b which are the second heat generation sources are one member. It is transmitted to the cooler 7 through the bottom cylindrical cast cooling member 10, so that the number of members can be reduced and the structure is simple.
In addition, since the entire bottom surface of the cast cooling member 10 is in surface contact with the cooler surface 8 of the cooler 7, the heat of the core 3 and the coils 2a and 2b is efficiently transmitted to the cooler 7, and the cooling efficiency Will improve.
Moreover, since the contact surface with respect to the cooler surface 8 of the bottom wall surface part 14 is large, stable grease application is possible.

Moreover, the core cooling surface part 14a and the coil cooling surface part 14b are flat stepped shapes, and the optimum cooling area of each of the core cooling surface part 14a and the coil cooling surface part 14b can be easily set according to the size of the core 3 and the coil 2. Can be set to
The heat from the core 3 is mainly transmitted to the bottom wall surface portion 14 through the step portion 15 and the first sidewall surface portion 12a, and the heat from the coils 2a and 2b is directly transmitted to the bottom wall surface portion 14 to The transmission path is short and the thermal resistance is small.

In addition, a plurality of concave portions are formed at intervals along the edge portion at the edge portion of the casting cooling member 10 including the first side wall surface portion 12a and the step portion 15 so that a plurality of ribs 5a are formed between the concave portions. Therefore, it is possible to prevent the occurrence of a cast hole that causes temperature variation, and the casting cooling member 10 is ensured to have uniform thermal conductivity in each part.
Further, the rib 5a increases the contact area with the air at the edge of the cast cooling member 10, and a high air cooling effect by natural convection can be obtained.

Further, since the secondary bobbin 9b has a fixing part 20 for holding and fixing the core 3 with a gap between the core bobbin 9b and the core cooling surface part 14a by the fixing means, the transformer 1 is attached to the casting cooling member 10. Can be prevented from being damaged by stress at the seam of the core 3 between the U-shaped core portions from the core cooling surface portion 14a, and without concern about the occurrence of cracks in the core 3 during fixing. The core 3 is cooled.
Moreover, the casting cooling member 10 can be manufactured only by casting and is easy to manufacture.

Embodiment 2. FIG.
FIG. 6 is a perspective view showing a cast cooling member 10A of the transformer device with a cooler according to the second embodiment of the present invention.
In this embodiment, a plurality of notches are formed at the edge of the casting cooling member 10A composed of the first side wall surface portion 12a, the bottom wall surface portion 14 and the step portion 15 at intervals along the edge portion. Thus, a plurality of ribs 5a are provided between the notches.
Other configurations are the same as those of the transformer device with a cooler of the second embodiment.

In this embodiment, the rib 5a is formed by casting from the two surface directions of the first side wall surface portion 12a and the bottom wall surface portion 14, so that the manufacturing cost is reduced as compared with the first embodiment.
Other operations and effects are the same as those of the transformer device with a cooler of the first embodiment.

Embodiment 3 FIG.
FIG. 7 is a perspective view showing a cast cooling member 10B of the transformer device with a cooler according to the third embodiment of the present invention.
In this embodiment, the step portion 15A is composed of a plurality of plate-like ribs 5c arranged at intervals.
Other configurations are the same as those of the transformer device with a cooler of the first embodiment.

In this embodiment, the rib 5c is formed by casting from the direction of the opening of the casting cooling member 10B.
Other operations and effects are the same as those of the transformer device with a cooler of the first embodiment.

In each of the above embodiments, the relay member is a cast cooling member 10, 10A, 10B formed by aluminum die casting, but may be a material other than aluminum, or may be formed by a method other than casting. A relay member may be formed.
Moreover, although the relay member was a bottomed rectangular tube shape according to the shape of the transformer, it may be a bottomed cylindrical shape, for example, according to the heat generating element to be stored.
Moreover, in each embodiment, although a heat generating body is a transformer which is an electromagnetic device, this invention is applicable also to reactors other than a transformer, for example.
Of course, the heat source may be other than the core and the coil.
The cooler 7 may use a liquid refrigerant other than water or may be air-cooled.
Further, a heat radiation sheet may be interposed between the cooler 7 and the bottom wall surface portion 14 instead of grease.
Further, the bobbin fixing base 13 is not limited to a circle. Further, the position where the bobbin fixing base 13 is provided may be the coil cooling surface portion 14 b or the cooler surface 8 of the cooler 7.
Further, the potting agent 6 may be an epoxy resin, silicone or the like in addition to the urethane resin.
Further, in the third embodiment, a through hole is formed in the portion of the first side wall surface portion 12a between the adjacent ribs 5c, the surface area of the rib 5c is increased, and the heat dissipation performance of the rib 5c is improved. Also good.

DESCRIPTION OF SYMBOLS 1 Transformer (heat generating body), 2a Primary coil (2nd heat generating source), 2b Secondary coil (2nd heat generating source), 3 Core (1st heat generating source), 5a, 5b, 5c Rib, 6 Potting agent 7 cooler, 7a water channel, 8 cooler surface, 9a primary bobbin, 9b secondary bobbin, 10, 10A, 10B cast cooling member, 12a first side wall surface part, 12b second side wall surface part, 13 bobbin fixing base, 14 bottom wall surface portion, 14a core cooling surface portion (first heat generation facing surface portion), 14b coil cooling surface portion (second heat generation facing surface portion), 15, 15A stepped portion, 20 fixing portion, 21 inlet piping, 22 outlet piping.

Claims (9)

A heat generator with a cooler in which a heat generator having a first heat source and a second heat source is attached to a cooler via a heat conductive relay member,
The relay member has a bottomed cylindrical shape in which the heating element is accommodated, and is integrated with the first heat generation facing surface portion facing the first heat generation source and the first heat generation facing surface portion. A second heat generation facing surface portion facing the heat generation source of 2;
The heat generating device with a cooler is characterized in that the entire bottom surface is in surface contact with the cooler surface of the cooler.   The heating element is an electromagnetic device, the first heat generation source is a core, and the second heat generation source is a coil in which a conductive wire is wound around the core via a bobbin. The heat generating apparatus with a cooler according to claim 1. The relay member is formed to face each other at a bottom wall surface portion, a side wall surface portion extending vertically from each peripheral portion of the bottom wall surface portion, and a corner portion where the side wall surface portion and the bottom wall surface portion intersect. A pair of steps,
The first heat generation facing surface portion is a core cooling surface portion of one surface of the stepped portion,
3. The heat generating device with a cooler according to claim 2, wherein the second heat generating facing surface portion is a coil cooling surface portion at an intermediate portion of the bottom wall surface portion.   A plurality of concave portions are formed at intervals along the edge portion at the edge portion of the relay member including the side wall surface portion and the stepped portion, and a plurality of ribs are provided between the concave portions. The heat generating apparatus with a cooler according to claim 3.   A plurality of notches are formed between the notches by forming a plurality of notches at intervals along the edges on the edge of the relay member including the side wall surface, the bottom wall surface, and the stepped portion. The heating device with a cooler according to claim 3, wherein a rib is provided.   The said level | step-difference part is comprised with the plate-shaped several rib arrange | positioned at intervals, The heat generating apparatus with a cooler of Claim 3 characterized by the above-mentioned.   The said bobbin has a fixing | fixed part for hold | maintaining and fixing the said core with a space | gap between the said core cooling surface part by fixing means, The fixed part for any one of Claims 2-6 The heat generating apparatus with a cooler according to the item.   The heating device with a cooler according to any one of claims 1 to 7, wherein the relay member is a cast cooling member.   The heating device with a cooler according to claim 2, wherein the electromagnetic device is a transformer.

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