JP2006041353A - Heat dissipation structure of reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat dissipation efficiency of a reactor by improving heat dissipating characteristics of a coil, reducing consumption of filling material between the coil and a case, and shortening a heat dissipation channel from the coil; and to reduce the manufacturing cost by reducing the amount of resin with which a space between a reactor and the inner side of the case is filled. <P>SOLUTION: In a heat dissipating structure of the reactor 1 constituted by mounting the coil 3 on a core 2 through a bobbin 10, the coil 3 of the reactor 1 is covered with the case 5 connected to a cooling plate 7, a partition 6 connected to the case 5 is arranged between the coils 3 and 3 of the reactor 1, and the space between the case 5 and the coil 3 of the reactor 1 is filled with a heat dissipation material 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for improving heat dissipation of a coil of a reactor. More specifically, the present invention relates to a technology for improving heat dissipation by contacting a refrigerant with a coil of a reactor.

  A reactor is a transformer that uses inductive reactance and is composed of a core and a coil. A switching circuit is built into this, and ON-OFF is repeated to reverse the energy stored in the coil when turned on. It is generated as an electromotive force and takes out a high voltage. In particular, in a boost converter built-in type HV system used for driving a vehicle, a reactor corresponding to a high voltage and a large current is required for a booster circuit, and it is necessary to cool the reactor because the heat generated in the coil of the reactor is large. .

Conventionally, as a configuration for increasing the heat dissipation of the reactor, the reactor is put in an aluminum case and potted with a resin having good heat dissipation between the aluminum case and the reactor. And the silicone grease etc. are apply | coated to the lower surface of the aluminum case which accommodated the reactor, and the reactor is thermally radiated by making it contact on a cooling plate.
As another technique, there is known a technique in which a fin is attached to a coil of a reactor in order to improve the heat dissipation of the reactor (see Patent Document 1). In this structure, a cover covering the outer periphery of the coil has heat resistance, and a plurality of fins having good heat conductivity are formed, and heat dissipation of the coil is improved by heat dissipation through the fins.
JP-A-8-222442

However, in the conventional heat dissipation configuration of the reactor, a gap between the case that houses the reactor and the coil is large, and a large amount of resin that fills the reactor and the inside of the case is required. For this reason, manufacturing cost is high and uneven filling of the resin is likely to occur.
Moreover, in the technique shown in Patent Document 1, the structure is complicated, the assemblability is poor, and it is difficult to perform stable cooling. And since a fin is attached via a cover, it is difficult to ensure heat conductivity, and it is difficult to ensure heat dissipation inside the core.

  The present invention relates to a reactor with improved heat dissipation in consideration of the above-described problems, and has a heat dissipation device structure that dissipates mainly heat generated in the coil portion, and a distance at which heat conduction from the coil to the heat dissipation member is performed. The heat conduction efficiency is improved and the heat dissipation of the coil is improved. The reactor coil is housed in the case so that the distance between the case and the coil is short, and a gel sheet such as silica or a refrigerant is filled between the coil and the case so that the heat generated by the coil The case is designed to dissipate heat.

  That is, as described in claim 1, in a reactor heat dissipation structure in which a coil is mounted on a core via a hobbin, the reactor coil is covered by a case connected to a cooling plate, and the case is interposed between the reactor coils. A partition wall connected to is disposed, and a heat radiating material is filled between the case and the coil of the reactor.

  As described in claim 2, in the heat dissipation structure of the reactor in which the coil is mounted on the core via the hobbin, the edge protruding outside the hobbin and the case for storing the coil of the reactor are engaged, A partition wall connected to the case is disposed between the coils of the reactor, and a heat radiating material is filled between the case and the coil of the reactor.

  According to a third aspect of the present invention, in the reactor heat dissipation structure in which the coil is mounted on the core via the hobbin, the edge protruding to the outside of the hobbin and the case storing the coil of the reactor are engaged, The hobbin and the case form a space for storing the coil of the reactor, and the space for storing the coil is filled with the refrigerant.

In the reactor heat dissipation structure in which a coil is mounted on a core via a hobbin as described in claim 1, the reactor coil is covered by a case connected to a cooling plate, and connected to the case between the reactor coils. Since the heat sink is filled between the case and the coil of the reactor,
Since the heat dissipation path from the coil can be shortened and the path through the heat dissipation material to be filled between the coil and the case in the heat dissipation path can be shortened, the heat dissipation efficiency of the coil can be improved.

As described in claim 2, in the heat dissipation structure of the reactor in which the coil is mounted on the core via the hobbin, the edge protruding outside the hobbin and the case for storing the coil of the reactor are engaged, Since a partition wall connected to the case is arranged between the coils of the reactor, and a heat radiating material is filled between the case and the coil of the reactor,
Since the space for cooling the coil can be configured using the hobbin of the reactor, the cooling space along the shape of the reactor can be easily configured, and the number of members used for cooling can be reduced.

According to a third aspect of the present invention, in the reactor heat dissipation structure in which the coil is mounted on the core via the hobbin, the edge protruding to the outside of the hobbin and the case storing the coil of the reactor are engaged, The hobbin and the case constitute a space for storing the coil of the reactor, and the space for storing the coil is filled with the refrigerant.
The space for holding the refrigerant can be easily configured by using the hobbin of the reactor, and the volume of the refrigerant holding space can be reduced, so that high refrigerant circulation efficiency can be realized. Furthermore, since the hobbin of the reactor is used, the number of members used for cooling can be reduced.

  The present invention realizes improvement of the heat dissipation of the reactor by bringing a heat conduction medium into contact with the coil, and improves the heat dissipation efficiency by shortening the heat dissipation path from the coil.

Next, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a partial plan view in plan view showing the structure of the reactor, and FIG.
The reactor 1 is configured by attaching a coil 3 to a core 2 composed of an iron core. The coil 3 is attached to the core 2 while being wound around the hobbin 10. The hobbin 10 is composed of two cylindrical parts 10a and 10a and hobbin edge parts 10b and 10b. It is connected in a form orthogonal to 10a. The coil 3 is wound around the outer periphery of the cylindrical portion 10a between the hobbin edge portions 10b and 10b, and the core 2 is inserted inside the cylindrical portion 10a. The coil hobbin 10 is made of an insulator, and is configured to ensure insulation between the core 2 and the coil 3.

The coil 3 is covered with the case 5, the hobbin edges 10 b and 10 b, and the lid body 12. In FIG. 1, description will be made assuming that the upper side of the paper is the front of the reactor 1 and the lower side of the paper is the rear. The case 5 covers the side surface and the bottom surface of the coil 3, the hobbin edge portion 10 b covers the front surface and the rear surface of the coil 3, and the lid body 12 covers the top surface of the coil 3.
The case 5 is provided with the core 2 with the coil 3 mounted inside, and has an opening at the top. A lid body 12 is disposed on the upper portion of the case 5. The core 2 is disposed in the case 5 and the upper portion of the case 5 is closed by the lid body 12. And the front part and rear part of case 5 are each closed by hobbin edge part 10b * 10b.
On the inner side of the case 5, grooves 5a,... Are provided in the vertical direction, and the end of the hobbin edge 10b is engaged with the groove 5a. Thereby, the reactor 1 can be held by the case 5 via the hobbin 10.

Thus, the coil 3 mounted on the core 2 is covered, and the space covering the coil 3 is filled with a material having high thermal conductivity for cooling the coil. The case 5, the lid body 12, and the hobbin edges 10 b and 10 b constitute the filling chamber 4, and the coil 3 is located in the filling chamber 4. The coil 3 is disposed in the filling chamber 4, and the heat radiating material 11 is filled in the filling chamber 4. Thus, the coil 3 is covered with the heat radiating material 11, and the generated heat is transmitted to the case 5 through the heat radiating material 11.
In addition, as a method of filling the heat radiating material 11 in the filling chamber 4, a method of inserting the reactor 1 after arranging the heat radiating material in the case 5 can be used.

In the case 5, an internal wall 6 configured integrally with the case 5 is disposed between the coils 3 and 3. The inner wall 6 serves as a partition between the coils 3 and 3. The inner wall 6 is positioned inside the core 2 configured in a substantially elliptical shape, and efficiently guides heat transferred from the heat radiating material 11 to the case 5. By providing the inner wall 6, the contact area between the heat dissipation material 11 and the case 5 can be increased, and heat absorption by the case 5 can be promoted. By disposing the upper lid body 12 of the case 5, the contact area with the heat dissipation material 11 can be increased and heat conduction to the case 5 can be promoted, and the heat dissipation material 11 is filled in the filling chamber 4 by the lid body 12. It is something to hold. The inner wall 6 is in contact with the lid body 12 to reduce the space filled with the heat radiating material 11 in the case 5, and heat in the upper part of the case 5 can be radiated through the inner wall 6.
A cooling plate 7 is integrally formed at the lower portion of the case 5 and efficiently dissipates heat transmitted from the case 5. Further, by cooling the lower surface of the cooling plate 7 with cooling water, the heat transferred to the case 5 can be efficiently discharged.

The heat dissipating material 11 only needs to be able to efficiently transfer the heat of the coil 3 to the case 5. In this embodiment, a heat dissipating sheet is used as the heat dissipating material 11. A heat radiating sheet is wound around the coil 3 and stored in the case 5, and the heat radiating sheet wound around the coil 3 is brought into close contact with the case 5 to improve the heat conduction efficiency from the coil 3 to the case 5. As the heat dissipating material 11, a heat dissipating agent on gel or a heat conducting tape can be used.
It is also possible to improve insulation between the coil 3, the core 2, and the cooling plate 7 by using insulating paper. Furthermore, fins can be provided on the case 5, the inner wall 6, and the cooling plate 7 to increase the respective surface areas, thereby improving the heat conduction efficiency.

Next, a second embodiment of the reactor will be described.
FIG. 3 is a partial plan view showing a configuration of a reactor according to the second embodiment, and FIG. 4 is a partial front sectional view of the same. In the second embodiment, the coolant is supplied into the coolant chamber 24, and the coil is cooled by bringing the coil into contact with the coolant.
A hobbin 10 is attached to the core 2, and a coil 3 is wound around the hobbin 10. The hobbin 10 includes hobbin edges 10b and 10b and cylinders 10a and 10a. A side portion of the hobbin 10 is configured to be fitted into the seal box 21. The seal box 21 is configured to have a U-shape when viewed from the front, and has a groove 21a provided in the vertical direction on the inner side. The side end of the hobbin edge 10b edge 10b is inserted into the groove 21a. The seal box 21 and the hobbin 10 are connected.

The side of the hobbin 10 is covered with a seal box 21, and the upper part is covered with a lid body 12. Thus, a refrigerant chamber 24 that is a closed space is formed between the coil 3 and the seal box 21 and between the coil 3 and the lid body 12.
The refrigerant chamber 24 has an inlet 21b and an outlet 21c. A refrigerant is introduced into the inlet 21b, and the refrigerant chamber 24 is filled with the refrigerant. Then, the refrigerant overflowing in the refrigerant chamber 4 is discharged from the discharge port 21c. Thereby, the refrigerant | coolant chamber 24 is filled with a refrigerant | coolant, and the coil 3 can be cooled using a refrigerant | coolant.
By configuring the refrigerant chamber 24 with the hobbin 10 and the seal box 21, the refrigerant chamber 24 can be configured with the inner wall of the seal box 21 approaching the coil 10, and the volume of the refrigerant chamber 24 can be configured to be small. As a result, cooling can be performed with a small amount of refrigerant, and the amount of refrigerant remaining in the refrigerant chamber 24 can be reduced and efficient refrigerant circulation can be performed.
A projecting portion 26 projecting into the refrigerant chamber 24 is provided at the lower portion of the seal box 21, and a projecting portion 12 b projecting into the coolant chamber 24 is also provided at the upper portion of the lid body 12. The protrusions 26 and 12b are located between the coils 3 and 3 so that the refrigerant flows between the coils 3 and 3 when the refrigerant flows from the inlet 21b to the outlet 21c. Thereby, the coil 3 is efficiently cooled.

The partial plane sectional view which shows the structure of a reactor. Similarly front sectional drawing. The partial plane sectional view which shows the structure of the reactor which is a 2nd Example. Similarly front sectional drawing.

Explanation of symbols

1 Reactor 3 Coil 4 Filling Chamber 5 Case 6 Internal Wall 10 Hobin

Claims (3)

In the reactor heat dissipating structure where the coil is attached to the core via the hobbin,
The reactor coil is covered with a case connected to the cooling plate, a partition wall connected to the case is arranged between the reactor coils, and a heat dissipation material is filled between the case and the reactor coil. Characteristic reactor heat dissipation structure. In the reactor heat dissipating structure where the coil is attached to the core via the hobbin,
The edge projecting outside the hobbin is engaged with the case that houses the reactor coil, and a partition wall connected to the case is disposed between the reactor coil, and the space between the case and the reactor coil Reactor heat dissipation structure, characterized in that it is filled with heat dissipation material. In the reactor heat dissipating structure where the coil is attached to the core via the hobbin,
An edge protruding outside the hobbin and a case for housing the coil of the reactor are engaged, and a space for housing the coil of the reactor is formed by the hobbin and the case, and a refrigerant is stored in the space for housing the coil. Reactor heat dissipation structure characterized by satisfying

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