JP2016025137A - Reactor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a radiation performance from being reduced and to easily place a reactor onto a heat dissipation sheet.SOLUTION: Sidewall parts 60 and 62 and a central wall part 64 of a lower mold member are formed in such a manner that only a central protrusion (e.g., a protrusion 60a) that is formed so as to protrude at a position corresponding to gap members 24a and 24b is abutted to side faces of heat dissipation sheets 40 and 42. The heat dissipation sheets 40 and 42 are prevented by the protrusion from being deformed outside of portions corresponding to the gap members 24a and 24b. Therefore, the reduction of the radiation performance can be prevented by suppressing reduction of adhesion between peripheries of the gap members 24a and 24b of a reactor 20 in which heat is easily generated, and the heat dissipation sheets 40 and 42. Further, the heat dissipation sheets 40 and 42 are allowed to be deformed outwards in portions which are not abutted to the sidewall parts 60 and 62 and the central wall part 64, such that the reactor 20 can be easily placed on the heat dissipation sheets 40 and 42.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a reactor device, and more specifically, a reactor core in which a non-magnetic gap is provided between two U-shaped U-cores arranged opposite to each other, and the two U-shaped cores. The present invention relates to a reactor device including a reactor having a rotated coil, a case that houses the reactor, and a heat dissipation sheet that is disposed between the reactor and the case and has good thermal conductivity.

  Conventionally, as this type of reactor device, a reactor in which a gap layer is provided between two U-shaped cores, a case for housing the reactor, and a heat transfer sheet provided between the case and the reactor, What is provided is proposed (for example, refer patent document 1). In this device, the heat transfer sheet is placed in a recess formed in the bottom plate of the case, and the reactor is placed on the heat transfer sheet while pressing the heat transfer sheet with the reactor. At this time, the heat transfer sheet is deformed so as to spread outward, and the end portion comes into contact with the side surface of the recess, and further deformation of the heat transfer sheet is restricted by the reactor, the case, and the recess. Thereby, it is suppressed that a clearance gap arises between a reactor and a heat exchanger sheet, and heat dissipation performance falls.

JP2013-118208A

  In the above-described reactor device, when placing the reactor on the heat transfer sheet, the heat transfer sheet is pressed by the reactor and spread outward to bring the end of the heat transfer sheet into contact with the recess. Further, the case and the recess restrict the further deformation of the heat transfer sheet, and the reaction force of the heat transfer sheet becomes relatively large. Therefore, it is not easy to place the reactor in close contact with the heat transfer sheet, and a relatively long time is required for placement. As a method of facilitating the placement of the reactor on the heat transfer sheet, there is also a method of reducing the reaction force of the heat transfer sheet by providing a gap between the heat transfer sheet and the side surface of the recess. When the reactor repeats thermal expansion and contraction due to the increase or decrease of the current flowing through the reactor, and the force with which the reactor presses the heat-dissipating sheet increases or decreases, the heat-transfer sheet is deformed or pushed outward, and the reactor and heat-transfer sheet Adhesiveness will fall and the heat dissipation performance of a heat transfer sheet will fall.

  The reactor apparatus of this invention makes it easy to mount the reactor on the heat radiating sheet while suppressing a decrease in heat dissipation performance.

  The reactor device of the present invention employs the following means in order to achieve the main object described above.

The reactor device of the present invention is
A reactor having a reactor core in which a non-magnetic gap is provided between two U-shaped U-cores arranged opposite to each other and a coil wound over the two U-shaped cores; A reactor device comprising: a case that houses the reactor; and a heat radiating sheet that is disposed between the reactor and the case and has good thermal conductivity,
The heat radiating sheet has a wall portion that is provided on a plurality of side surfaces substantially parallel to the winding axis direction of the coil, and that has only predetermined portions corresponding to the gaps that come into contact with the side surfaces of the heat radiating sheet. A holding member that holds the coil in contact with the coil is provided.

  In the reactor device of the present invention, a holding member is provided which has wall portions on a plurality of side surfaces substantially parallel to the winding axis direction of the coil in the heat dissipation sheet and holds the heat dissipation sheet in contact with the coil. This wall portion is formed so that only a predetermined portion corresponding to the gap contacts the side surface of the heat dissipation sheet. Since the deformation of the heat dissipation sheet is suppressed at the predetermined portion of the wall portion, it is possible to suppress a decrease in adhesion between the periphery of the reactor gap and the heat dissipation sheet. In general, reactors are particularly susceptible to heat generation due to magnetic flux leakage around the gap, so the deterioration of heat dissipation performance is suppressed by suppressing the decrease in adhesion between the reactor gap and the heat dissipation sheet. it can. Since the wall portion is formed so that only a predetermined portion corresponding to the gap is in contact with the side surface of the heat radiating sheet, the portion that is not in contact with the wall portion of the heat radiating sheet is allowed to deform so as to spread outward. . Therefore, when the reactor is pressed against the heat radiating sheet and placed, the portion that is not in contact with the wall portion of the heat radiating sheet is deformed so as to spread outward, so that the reaction force of the heat radiating sheet can be reduced, Can be easily. As a result, it is possible to suppress the deterioration of the heat dissipation performance and facilitate the placement of the reactor on the heat dissipation sheet.

It is explanatory drawing which shows the outline of a structure of the reactor apparatus 10 mounted in the vehicle as one Example of this invention. 2 is an external view illustrating an outline of an external appearance of a peripheral portion of a reactor 20 as viewed from above. FIG. It is sectional drawing which shows the outline of the cross section in the AA line of FIG. It is sectional drawing which shows the outline of the cross section in the BB line of FIG. It is sectional drawing which shows the outline of the cross section in CC line of FIG. It is explanatory drawing which shows the mode of the reactor apparatus in the time of the high temperature and the low temperature of the reactor 20 when not providing a side wall part. It is explanatory drawing which shows the mode of the reactor apparatus at the time of making a side wall part contact | abut to a thermal radiation sheet. It is sectional drawing which shows the outline of the principal part of the reactor apparatus 110 of a modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is an explanatory diagram showing an outline of a configuration of a reactor device 10 mounted on a vehicle as an embodiment of the present invention. Reactor device 10 seals reactor 20 that forms part of a boost converter, a case 30 that houses reactor 20, heat radiation sheets 40 and 42 that are provided between reactor 20 and case 30, and reactor 20. And a mold member 50 to be provided. As illustrated, the reactor 20 is attached to the case 30 by fastening members 29a to 29c.

  FIG. 2 is an external view showing an outline of the external appearance of the peripheral portion of the reactor 20 as viewed from above. Reactor 20 is formed between the U-shaped cores 22a and 22b formed in a U-shape by a dust core and laminated steel plates and arranged opposite to each other, and between the ends of U-shaped cores 22a and 22b in order to suppress magnetic saturation. Gap members 24a.. Formed of magnetic material (for example, ceramic). And a coil 26 wound around the reactor core. In FIG. 2, a line connecting the centers of the U-shaped cores 22a and 22b is indicated by a broken line, and a reference numeral is attached.

  The heat radiating sheets 40 and 42 are formed of an insulating material (for example, silicon resin) having a good thermal conductivity, and are disposed below the gap members 24a and 24b, respectively. The heat radiating sheets 40 and 42 are larger than the outer shape of the coil 26 in the winding axis direction of the coil 26 (up and down direction in FIG. 2), and from the outer shape of the coil 26 in the direction perpendicular to the winding axis direction (left and right direction in FIG. 2). It is formed to be slightly smaller. The heat generated in the reactor 20 is radiated to the case 30 through the heat radiation sheets 40 and 42.

  3 is a cross-sectional view schematically showing a cross section taken along line AA in FIG. 2, FIG. 4 is a cross-sectional view showing a schematic cross section taken along line BB in FIG. 2, and FIG. 5 is a cross-sectional view taken along line CC in FIG. It is sectional drawing which shows the outline of a cross section. The mold member 50 is made of an insulating or rust-proof material (for example, polyphenylene sulfide resin (PPS)). As shown in FIGS. 3 to 5, the mold member 50 mainly covers an upper portion of the reactor 20. The mold member 52 and a lower mold member 54 that mainly covers the lower portion of the reactor 20 are configured as an integrally molded member.

  2 and 3, the lower mold member 54 includes sheet pressing portions 56 and 58 that hold the upper and lower ends of the heat radiation sheets 40 and 42 in FIG. 2 from above, and the heat radiation sheet 40. 2, the side wall portion 60 provided on the left side surface side in FIG. 2, the side wall portion 62 provided on the right side surface side in FIG. 2 of the heat radiating sheet 42, the central wall portion 64 provided between the heat radiating sheets 40, 42, Is provided.

  As shown in FIG. 2, the side wall 60 is formed in an E shape when viewed from above. As shown in FIGS. 2, 4, and 5, the side wall portion 60 has a convex portion 60 a at the center of the E shape that is convex at a position corresponding to the gap member 24 a, and contacts the left side surface of the heat radiation sheet 40 in FIG. 2. It is formed to touch. The convex portion 60a is formed such that the vertical length in FIG. 2 is longer than the vertical length of the gap member 24a in FIG. As shown in FIG. 2, the side wall portion 62 has a symmetrical shape with the side wall portion 60, and is formed such that the central convex portion comes into contact with the side surface of the heat dissipation sheet 42. The central wall portion 64 has a line-symmetric shape with respect to the vertical axis of symmetry in FIG. 2, the right side of the symmetry axis has the same shape as the side wall portion 60, and the left side of the symmetry axis has the same shape as the side wall portion 62. It is formed to become. Therefore, the central wall portion 64 is in contact with the heat radiation sheets 40 and 42 at the central convex portion.

  As shown in FIG. 5, the two concave portions (for example, the concave portions 60b and 60c) sandwiching the central convex portion (for example, the convex portion 60a) of the side wall portions 60 and 62 and the central wall portion 64 are arranged as shown in FIG. Are formed so as to have a distance α from the side surface. Here, the distance α is, for example, 15%, 20%, 25%, etc. of the volume of the heat radiation sheet 40 when the volume of the space formed by the side wall part 60, the central wall part 64, the case 30, and the reactor 20 is 15%. The volume of the space formed by the portion 62, the central wall portion 64, the case 30, and the reactor 20 is adjusted to be 15%, 20%, 25%, etc. of the volume of the heat radiation sheet 42.

  As described above, one reason why only the central convex portion (for example, the convex portion 60a) of the side wall portions 60, 62 and the central wall portion 64 is brought into contact with the heat radiation sheets 40, 42 is that the heat radiation sheets 40, 42 and the reactor are This is to prevent a decrease in adhesion to the periphery of the 20 gap members 24a and 24b. FIG. 6 is an explanatory view showing the state of the reactor device at the time of high temperature and low temperature of the reactor when the side wall portion is not provided, and FIG. 7 shows the state of the reactor device when the side wall portion is brought into contact with the heat radiation sheet. It is explanatory drawing. In FIG. 6, white arrows indicate the direction of force, and black arrows indicate the direction in which the heat dissipation sheet is deformed. In general, when a current flows through the coil of the reactor and heat is generated in the reactor, as shown in FIG. 7, the heat dissipation sheet is pressed by the reactor that is thermally expanded by the heat and deformed to spread outward. After that, when the coil current is reduced and the temperature of the reactor is lowered, the thermally expanded reactor contracts to reduce the force pressing the heat radiating sheet, and the deformed heat radiating sheet attempts to return. If the increase / decrease of the force which presses a heat radiating sheet is repeated in this way, a heat radiating sheet will deform | transform and shift | deviate and the adhesiveness of a heat radiating sheet and a reactor will fall. In the reactor, in particular, the magnetic flux protrudes to the coil side at the position of the gap member, and relatively large heat is likely to be generated. In the embodiment, as shown in FIG. 2 and FIG. 4, the gaps of the reactor 20 that are particularly likely to generate heat are caused by bringing the central convex portions of the side wall portions 60 and 62 and the central wall portion 64 into contact with the heat radiation sheets 40 and 42. Adhesiveness between the periphery of the gap members 24a and 24b of the reactor 20 and the heat dissipation sheets 40 and 42 by suppressing the deformation of the heat dissipation sheets 40 and 42 around the members 24a and 24b (portions surrounded by the ellipse in FIG. 2). Is suppressed. Thereby, the fall of heat dissipation performance can be suppressed.

  Moreover, the other reason which makes only the center convex part of the side wall parts 60 and 62 and the center wall part 64 contact | abut to the thermal radiation sheets 40 and 42 is for mounting the reactor 20 on the thermal radiation sheets 40 and 42 easily. . In the reactor device 10 of the embodiment, when the reactor 20 is stored in the case 30, the heat dissipation sheets 40 and 42 are placed on the case 30, and the reactor 20 provided with the upper mold member 52 and the lower mold member 54 is radiated. The heat radiating sheets 40 and 42 are deformed so as to spread outwardly by pressing against the sheets 40 and 42, and the heat radiating sheets 40 and 42 are brought into contact with the side wall portions 60 and 62 and the central wall portion 64 of the lower mold member 54. Then, the reactor 20 and the case 30 are fastened by the fastening members 29a to 29c in a state where the reactor 20 is placed on the heat radiation sheets 40 and 42 in this way. At this time, if the reaction force of the heat radiating sheets 40 and 42 is large, it takes a relatively long time to place the reactor 20 on the heat radiating sheets 40 and 42 and the working efficiency is lowered. As shown in FIGS. 4 and 5, since the side wall portions 60 and 62, the central wall portion 64 and the heat radiation sheets 40 and 42 are in contact with each other only at the center convex portion, 62, it is allowed to deform so that the part which is not in contact with central wall part 64 spreads outside. Thereby, the reaction force of the heat radiating sheets 40 and 42 can be reduced, and the placement of the reactor 20 on the heat radiating sheets 40 and 42 can be facilitated.

  According to the reactor device 10 of the embodiment described above, only the convex portions 60a formed so as to be convex at the positions corresponding to the gap members 24a and 24b of the side wall portions 60 and 62 and the central wall portion 64 are provided on the heat radiation sheet 40. , 42 is brought into contact with the gap member 24a, 24b of the reactor 20 and the heat radiation sheet 40, 42 can be prevented from lowering the heat dissipation performance by suppressing the lowering of the heat radiation performance. Mounting on 40 and 42 can be facilitated.

  In the reactor device 10 according to the embodiment, the concave portions of the side wall portions 60 and 62 and the central wall portion 64 are formed so as to have the distance α from the respective side surfaces of the heat radiation sheets 40 and 42. As shown in the apparatus 110, the distance between the concave portions of the side wall portions 60 and 62 and the central wall portion 64 and the side surfaces of the heat radiation sheets 40 and 42 gradually increases toward the case 30 (downward in FIG. 8). It may be formed.

  In the reactor device 10 of the embodiment, the upper mold member 52 and the lower mold member 54 are integrally formed, but the lower mold member 54 may be formed as a separate member from the upper mold member 52, The mold member 54 may be integrally formed with the case 30.

  In the reactor device 10 of the embodiment, the heat radiating sheets 40 and 42 are respectively disposed below the gap members 24a and 24b of the reactor core 22. However, it is assumed that the side wall portion 62 is not provided, and one heat radiating sheet is attached to the reactor core 22. It is good also as what is arrange | positioned under the gap members 24a and 24b.

  In the reactor device 10 of the embodiment, the gap members 24a. 24b is provided, but a space, a so-called air gap, may be provided instead of the gap members 24a and 24b.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the reactor corresponds to the “reactor”, the case 30 corresponds to the “case”, the heat dissipation sheet 40 corresponds to the “heat dissipation sheet”, and the side wall portion 60 and the central wall portion 64 correspond to the “wall portion”. The lower mold member 54 corresponds to a “holding member”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of reactor devices.

  DESCRIPTION OF SYMBOLS 10 Reactor apparatus, 20 Reactor, 22a, 22b U-core, 24a, 24b Gap member, 29a-29c Fastening member, 30 Case, 40, 42 Heat radiation sheet, 50 Mold member, 52 Upper mold member, 54 Lower mold member, 56 , 58 Sheet pressing part, 60, 62 side wall part, 60a convex part, 60b, 60c concave part, 64 central wall part.

Claims (1)

A reactor having a reactor core in which a non-magnetic gap is provided between two U-shaped U-cores arranged opposite to each other and a coil wound over the two U-shaped cores; A reactor device comprising: a case that houses the reactor; and a heat radiating sheet that is disposed between the reactor and the case and has good thermal conductivity,
The heat radiating sheet has a wall portion that is provided on a plurality of side surfaces substantially parallel to the winding axis direction of the coil, and that has only predetermined portions corresponding to the gaps that come into contact with the side surfaces of the heat radiating sheet. A reactor device comprising: a holding member that is held in contact with the coil.