JP2018026467A - Reactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reactor capable of securing both miniaturization and heat dissipation.SOLUTION: A reactor includes: an annular core; a coil 5 mounted on at least a part of the annular core: a case 4 in which the annular core and the coil 5 are housed; a surrounding member which is housed in the case 4 and has a wall higher than the lowest height of the wall of the case 4 and whose wall surrounds the periphery of the coil 5; a projection 30 which has elasticity and serves as an annular sealing member for sealing between the surrounding member and the case 4. The surrounding member is an outer leg covering part 212 covering an E-shaped core 10a.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a reactor having a core and a coil attached to a part of the core.

  Reactors are used in various applications including drive systems for hybrid vehicles and electric vehicles. For example, a reactor in which a coil is wound around a resin bobbin disposed around a core is often used as a reactor used in an in-vehicle booster circuit.

  When a reactor body including a core made of a magnetic material and a coil attached to a part of the core is operated by passing a current through the coil, the core and the coil generate heat. Therefore, conventionally, the reactor body is housed in a metal case, and the case is configured by filling and solidifying the case with a heat-dissipating filler. Thereby, since a filler is arrange | positioned around a reactor main body, the heat_generation | fever of a reactor main body propagates to a case via a filler, and has ensured heat dissipation.

JP 2012-253068 A

  However, the reactor is often used with other electrical components and is often arranged in a narrow space with other electrical components. Therefore, the demand for miniaturizing the reactor size is very strict. Because of these demands, there are cases where the height of the wall of the case has to be lowered.

  In this case, since the height of the case wall is the maximum height that can be filled with the filler, if the height of the case wall is low, the upper side of the reactor body is filled with the filler even if the filler is filled. It cannot be covered, and most remains exposed. For this reason, when the temperature of the coil rises under transient conditions, it is difficult for the heat of the exposed portion of the coil to escape and the necessary heat dissipation cannot be ensured. To deal with this, the reactor had to be enlarged. Thus, the miniaturization of the reactor and the securing of heat dissipation are in a trade-off relationship, and it has been desired to achieve both.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a reactor that can achieve both downsizing and ensuring heat dissipation.

The reactor of this invention has the following structures, It is characterized by the above-mentioned.
(1) An annular core.
(2) A coil mounted on at least a part of the annular core.
(3) A case for housing the annular core and the coil.
(4) An enclosing member that is housed in the case and has a wall that is higher than the lowest height of the wall of the case, and the wall surrounds the coil.
(5) An annular seal member that has elasticity and seals between the enclosure member and the case.

The reactor of the present invention may have the following configuration.
(6) A resin member that covers the periphery of the annular core is provided, and the annular core is disposed at the center, the middle leg portion on which the coil is mounted, and a pair of outer leg portions disposed on both sides of the middle leg portion. And a pair of joint legs connecting the end portions of the middle leg and the pair of outer legs, and the resin member includes a pair of outer legs covering parts covering the outer legs, A pair of leg covering parts covering the leg parts,
The enclosure member includes the pair of outer leg covering portions and the pair of joint leg covering portions.
(7) The annular core is formed by joining a pair of E-shaped cores directly or via a gap, the resin member is formed by joining a pair of E-shaped resin bodies, and the sealing member is It is provided on the bottom surface of the resin member.
(8) The seal member is provided on the outer periphery of the bottom surface of the resin member.
(9) The seal member is provided between the outer side surface of the resin member and the inner wall surface of the case.

(10) At the upper part of the outer leg covering portion and the joint leg covering portion, there is a projecting opening communicating with the space in which the coil surrounded by the pair of outer leg covering portions and the pair of leg covering portions is arranged. Be provided.
(11) The seal member is an elastomer.

  Further, the reactor of the present invention is provided in the plate-like body, an annular core, a coil attached to at least a part of the annular core, a plate-like body on which the annular core and the coil are installed, You may provide the enclosure member which consists of a cylinder shape surrounding the circumference | surroundings of the said coil, and the cyclic | annular sealing member which has elasticity and seals between the said enclosure member and the said plate-shaped body.

  ADVANTAGE OF THE INVENTION According to this invention, the reactor which can make size reduction and ensuring heat dissipation compatible can be obtained.

It is a perspective view which shows the whole structure of the reactor which concerns on 1st Embodiment. It is a disassembled perspective view which shows the whole structure of the reactor which concerns on 1st Embodiment. It is a top view of an annular core. It is a perspective view which shows the upper surface side of the reactor main body which concerns on 1st Embodiment. It is a perspective view which shows the bottom face side of the reactor main body which concerns on 1st Embodiment. It is a top view of the reactor which concerns on 1st Embodiment. It is AA sectional drawing of FIG. It is the elements on larger scale of FIG. It is a BB cross-sectional perspective view of FIG. It is CC sectional perspective view of FIG. It is DD sectional drawing of FIG.

  Hereinafter, a reactor according to an embodiment of the present invention will be described with reference to the drawings.

[1. First Embodiment]
[1-1. Schematic configuration]
FIG. 1 is a perspective view showing the overall configuration of the reactor according to the present embodiment, and FIG. 2 is an exploded perspective view thereof.

  A reactor is an electromagnetic component that converts electric energy into magnetic energy and stores and discharges it, and is used for voltage step-up / step-down and the like. The reactor according to the present embodiment is a large-capacity reactor used in, for example, a drive system for a hybrid vehicle or an electric vehicle. The reactor is a main component of the booster circuit mounted on these automobiles.

  The reactor includes a reactor main body 1, a case 4, and a filling molding part 6. As shown in FIGS. 1 and 2, the reactor body 1 includes an annular core 10 including a magnetic body, a single coil 5 mounted on a part of the outer periphery of the annular core 10, and an outer periphery of the annular core 10. And a resin member 20 that insulates the annular core 10 and the coil 5 from each other. The reactor body 1 is accommodated in the case 4. The case 4 is made of a light metal having high thermal conductivity, such as an aluminum alloy, and has heat dissipation. The filling molding unit 6 accommodates the reactor main body 1 in the case 4, and fills the gap between the reactor main body 1 and the case 4 and the gap between the coil 5 and the annular core 10 or the resin member 20, and solidifies. It is formed.

[1-2. Detailed configuration]
The detailed structure of each part of the reactor of this embodiment is demonstrated using FIGS. In this specification, the z-axis direction shown in FIG. 1 is the “upper” side, and the opposite direction is the “lower” side. In describing the configuration of each member, “lower” is also referred to as “bottom”. The z-axis direction is the vertical direction of the reactor and the height direction of the reactor.

(Annular core)
As shown in FIGS. 2 and 3, the annular core 10 has a substantially θ shape as a whole. Specifically, the annular core 10 extends in one direction and is arranged in the center and is attached to the middle leg 10A on which the coil 5 is mounted, and is arranged on both sides of the middle leg 10A extending in the same direction as the middle leg 10A. A pair of outer legs 10B and a pair of joint legs 10C that are orthogonal to the middle legs 10A and the outer legs 10B and connect the ends of the middle legs 10A and the pair of outer legs 10B. The part 10B and the joint leg part 10C form a rectangular annular shape.

  Of the annular core 10, the middle leg portion 10 </ b> A is a portion where magnetic flux is generated because the coil 5 is wound around. The outer leg portion 10B and the joint leg portion 10C are yoke portions through which the magnetic flux generated in the middle leg portion 10A passes without the coil 5 being wound. In the annular core 10, the magnetic flux generated in the middle leg portion 10 </ b> A is divided into left and right, and passes through the joint leg portion 10 </ b> C, the outer leg portion 10 </ b> B, and the joint leg portion 10 </ b> C serving as a yoke part, thereby two annular closed magnets A path is formed.

  The annular core 10 includes a magnetic body. In the present embodiment, the annular core 10 includes a pair of E-shaped cores 10a and 10b as shown in FIGS. The E-shaped cores 10a and 10b are made of a magnetic material such as a dust core, a ferrite core, or a laminated steel plate. Here, the E-shaped cores 10a and 10b are dust cores.

  The middle leg portion 10A is configured by arranging the central leg portions of the E-shaped cores 10a and 10b to face each other, and the leg portions extending in parallel with the leg portions extending in the center of the E-shaped cores 10a and 10b are abutted. This constitutes the outer leg portion 10B. A portion connecting the three legs of the E-shaped cores 10a and 10b is a joint leg 10C.

  The middle leg portion 10A is provided with an air gap between the central leg portions of the E-shaped cores 10a and 10b. However, the middle leg portion 10A may be joined directly by an adhesive or the like, or may be joined via a gap spacer. Also good. In the outer leg portion 10B, the leg portions constituting the outer leg portions of the E-shaped cores 10a and 10b are joined to each other by an adhesive or the like, but may be joined via a gap spacer. As the gap spacer, a non-magnetic material, ceramic, non-metal, resin, carbon fiber, or a composite material of two or more of these or gap paper can be used.

(Resin member)
The resin member 20 is a member that covers the outer periphery of the annular core 10 with resin. Therefore, the resin member 20 is formed in a substantially annular shape following the shape of the annular core 10.

  Examples of the resin constituting the resin member 20 include an epoxy resin, an unsaturated polyester resin, a urethane resin, BMC (Bulk Molding Compound), PPS (Polyphenylene Sulfide), and PBT (Polybutylene Terephthalate).

  As shown in FIG. 2, in the present embodiment, the resin member 20 is divided into two parts, and has a substantially E-shaped resin body 21 and a resin body 22, respectively. That is, the resin member 20 is configured by molding the resin body 21 and the resin body 22 separately and facing one end of each other. The reason why the resin body 21 and the resin body 22 are separately molded is that the coil 5 is fitted to the resin member 20 by fitting the coil 5 into the E-shaped central leg portions of the resin bodies 21 and 22.

  The resin bodies 21 and 22 include a middle leg covering portion 211, a pair of outer leg covering portions 212, and a joint leg covering portion 213 that connects these covering portions 211 and 212. In the present embodiment, the resin bodies 21 and 22 are members integrally formed of a resin, and the covering portions 211 and 212 and the covering portion 213 are seamlessly configured. E-shaped cores 10a and 10b are embedded in the resin bodies 21 and 22 by a molding method. Since the resin body 21 and the resin body 22 have the same configuration, only the resin body 21 will be described.

  The middle leg covering portion 211 is a cylindrical body that covers the middle leg portion among the three leg portions of the E-shaped cores 10a and 10b. The middle leg covering portion 211 is a portion on which the coil 5 is mounted. An opening 214 that exposes the end surface of the middle leg portion of the E-shaped core 10 a is provided at the tip of the middle leg covering portion 211. As shown in FIGS. 2, 4, and 5, the upper and lower surfaces of the middle leg covering portion 211 are provided with spacers 211 a that protrude vertically. The spacer 211a is interposed between the inner peripheral upper and lower surfaces of the coil 5 and the middle legs of the E-shaped cores 10a and 10b, and positions the coil 5.

  The outer leg covering portion 212 is a cylindrical body that covers the outer leg portion among the three leg portions of the E-shaped cores 10a and 10b. An opening 217 that exposes the end surfaces of the outer legs of the E-shaped cores 10a and 10b is provided at the distal end portion of the outer leg covering portion 212, and when the ends of the resin bodies 21 and 22 are abutted, The exposed end surfaces are joined to each other through an adhesive. A gap spacer may be interposed between the end faces. In addition, as shown in FIGS. 7, 9, and 11, which will be described later, the space between the inner surfaces of the pair of outer leg covering portions 212 is the same as the outer diameter of the coil 5. However, the space between the outer peripheral inner surfaces of the pair of outer leg covering portions 212 may be slightly larger than the outer diameter of the coil 5 and may have a gap.

  The joint leg covering part 213 is a covering part that covers the joint leg part that connects the three leg parts of the E-shaped cores 10a and 10b. An opening 215 that exposes the back surface of the E-shaped cores 10 a and 10 b is provided on the back surface of the joint leg covering portion 213, that is, on the outer portion facing the inner wall surface of the case 4. On the other hand, the inner peripheral surface of the joint leg covering portion 213 of the resin bodies 21 and 22 faces the end surface of the coil 5. In other words, as shown in FIG. 11, the inner peripheral surface of the joint covering portion 213 of the resin bodies 21 and 22 is separated from the length in the winding axis direction of the coil 5, and the inner peripheral surface and the coil A gap is formed between the end face 5 and the filler.

  As shown in FIGS. 2 and 4, a U-shaped wall portion 216 extending upward is provided on the upper surfaces of the joint leg covering portion 213 and the outer leg covering portion 212 of the resin body 21. By abutting the end portions of the resin bodies 21 and 22, both end portions of the U-shape of the wall portion 216 are abutted to form a rectangular projection port 218. The protrusion 218 is a place where a filler is injected. In other words, the protrusion 218 communicates with a space 219 in which a coil surrounded by the pair of outer leg covering portions 212 and the pair of joint leg covering portions 213 is arranged.

  As shown in FIGS. 1 and 7, the height H of the resin member 20 when the reactor main body 1 is accommodated in the case 4 is higher than the lowest height Hcmin of the wall of the case 4. As shown in FIG. 4, the resin member 20 encloses the four sides of the coil 5 with a pair of outer leg covering portions 212 and a pair of joint leg covering portions 213. In other words, the outer leg covering portion 212 and the joint leg covering portion 213 are walls, and the height thereof is higher than the lowest height Hcmin of the wall of the case 4. The outer leg covering part 212 and the joint leg covering part 213 are U-shaped, and the outer leg covering part 212 and the joint leg covering part 213 surround the coil 5 by abutting both ends thereof. It becomes.

  As shown in FIG. 5, a protrusion 30 protruding downward is provided on the bottom surface of the resin member 20. Here, it is provided on the outer periphery of the bottom surface of the resin member 20. The protrusion 30 is a sealing member made of an elastic body having an annular shape, and is made of an elastomer, rubber, or the like. In the present embodiment, the protrusion 30 is formed by two-color molding using an elastomer softer than the resin bodies 21 and 22 and the case 4. The protrusion 30 is pressed downward when the reactor main body 1 is accommodated in the case 4, so that the protrusion 30 is crushed between the bottom surface of the case 4 and is in close contact with the bottom surface of the case 4. A container filled with a filler is formed by the joint leg covering portion 213 and the bottom surface of the case 4.

(coil)
The coil 5 is a conducting wire having an insulating coating. In this embodiment, the coil 5 is a flat wire edgewise coil, and is composed of one copper wire covered with an insulating material such as enamel. However, the wire material and winding method of the coil 5 are not limited to the rectangular wire edgewise coil, and may be in other forms.

  The coil 5 is attached to the outer periphery of the middle leg covering portion 211 so as to surround the middle leg portion 10A. Specifically, as shown in FIG. 9, the inner peripheral upper surface and the inner peripheral lower surface of the coil 5 are in contact with the upper and lower spacers 211 a of the middle leg covering portion 211. Further, the outer peripheral side surface of the coil 5 is in contact with the inner peripheral surface of the outer leg covering portion 212. Therefore, the coil 5 is positioned in the vertical direction by the spacer 211 a and is positioned in the horizontal direction by the outer peripheral inner surface of the outer leg covering portion 212. A gap is provided between the inner peripheral side surface of the coil 5 and the outer peripheral side surface of the middle leg covering portion 211.

  As shown in FIG. 1, both end surfaces of the coil 5 are slightly separated from the inner surface of the joint covering portion 213, and a gap is formed through which the filler constituting the filling molding portion 6 enters.

  Both ends of the coil 5 are drawn out of the reactor and are electrically connected to wiring of an external device such as an external power source. When power is supplied from an external power source, a current flows through the coil 5 to generate a magnetic flux penetrating the coil 5, and a closed magnetic circuit is formed in the annular core 10.

(Case)
The case 4 is a housing member that houses the reactor main body 1. The case 4 is made of a light metal having high thermal conductivity, such as an aluminum alloy, and has heat dissipation.

  In the present embodiment, the case 4 has a substantially rectangular parallelepiped shape with an opening on the upper surface, and is mainly composed of a bottom surface and a side wall rising from the edge of the bottom surface. The case 4 is surrounded by the bottom surface and the side wall and accommodates the reactor body 1. It has a space and a fixing portion 41 provided with a screw hole for fixing the reactor to the installation location. The height of the side wall of the case 4 is lower than the height of the reactor body 1 and is about half here.

  The accommodation space of the case 4 is slightly larger than the size of the reactor body 1. The bottom surface of the case 4 has a recess 42 whose center portion follows the coil 5, and the periphery of the recess 42 is a flat surface 43. When the reactor main body 1 is housed in the case 4, a gap is formed between the inner surface of the side wall of the case 4 and the side surface of the reactor.

  In the present embodiment, four fixing portions 41 are provided on the side wall of the case 4 so as to overhang the yz plane. Here, two fixing portions 41 are provided on the two side walls facing the case 4 parallel to the yz plane. As shown in FIG. 2, a notch 44 is provided on one side wall of the case 4. The notch 44 exposes the back surface portion of the joint leg portion 13 </ b> C through the opening 215 provided on the back surface of the joint leg covering portion 213. For example, when the case 4 is made of aluminum, the cutout 44 portion can prevent a decrease in inductance value due to the shielding effect of the aluminum material because the aluminum material does not exist.

(Filling part)
The filling molding portion 6 is formed by filling and solidifying the filling material into the inside of the surrounding member and the gap between the reactor main body 1 and the case 4 from the upper protrusion 218 formed by the wall 216 of the resin member 20. The filling molding unit 6 fixes the reactor body 1 in the case 4 as the filler is solidified. Note that the reactor body 1 is fixed to the case 4 by providing a fixing portion having a screw insertion hole in the resin member 20 and providing a screw insertion hole corresponding to this in the case 4 so as to be fixed by screw fastening. good. As the filler, a relatively soft and highly heat-conductive resin is suitable for ensuring the heat dissipation performance of the reactor and reducing the vibration propagation from the reactor body 1 to the case 4. Moreover, it is preferable that a filler has insulation.

  As a forming method of the filling molding part 6, after the reactor main body 1 is accommodated in the case 4, the filler may be filled and solidified, or the case 4 is filled with the filler in advance, and then the reactor main body 1 is filled. And the filler may be solidified.

[1-3. Action]
The effect | action of the reactor which concerns on this embodiment is demonstrated using FIGS. FIG. 6 is a top view of the reactor according to the present embodiment. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a partially enlarged view of FIG. 9 is a cross-sectional perspective view taken along line BB in FIG. FIG. 10 is a cross-sectional perspective view taken along the line CC of FIG. 11 is a cross-sectional view taken along the line DD of FIG.

  As described above, as shown in FIGS. 4 and 5, the reactor body 1 includes the resin bodies 21 and 22 in which the coil 5 is fitted in the middle leg covering portion 211 and the E-shaped cores 10 a and 10 b are embedded therein. The end portions of the outer leg covering portion 212 are butted together and bonded with an adhesive or the like. The outer leg covering portion 212 and the joint leg covering portion 213 of the resin bodies 21 and 22 each have a U-shape, and the outer legs of the resin bodies 21 and 22 are joined to join the ends of the U shapes. The covering portion 212 and the joint leg covering portion 213 form a cylindrical surrounding member that surrounds the coil 5.

  As shown in FIGS. 7 and 8, when the reactor main body 1 is accommodated in the case 4, the protrusion provided on the bottom surface of the outer leg covering portion 212 and the joint leg covering portion 213 by pressing the reactor main body 1 downward. 30 is brought into contact with the flat surface 43 which is the bottom surface portion of the case 4 and is crushed. As a result, the space between the resin member 20 and the bottom surface of the case 4 is hermetically sealed, and a container filled with a filler is formed by the outer leg covering portion 212 and the joint leg covering portion 213 serving as the enclosure member and the bottom surface of the case 4. The In other words, a square tube is formed by the outer covering portion 212 and the joint covering portion 213, and the end portion is closed by the bottom surface of the case 4 via the protrusion 30 of the elastic body. It is formed.

  Therefore, even if the filler is filled in the gap surrounded by the outer leg covering portion 212 and the joint leg covering portion 213 from the upper protruding port 218 constituted by the wall portion 216, the filler gets over the wall of the case 4. There is no leakage to the outside. If the filling of the filler is continued, the liquid level of the filler can be made higher than the minimum height of the wall of the case 4. In other words, in the prior art in which the case 4 is filled with the filler, the height of the liquid level of the filler is limited by the height of the wall of the case 4, but in this embodiment, the height of the wall of the case 4 is filled. The height of the liquid level of the material is not limited and can be made higher than the minimum height of the wall of the case 4.

  Specifically, the flow of the filler will be described. The filler is poured into the gap surrounded by the surrounding member, that is, the gap between the coil 5 and the wall portion 216, from the upper projecting port 218 constituted by the wall portion 216, and as shown in FIGS. Enters the gap between the inner periphery of the inner leg and the outer periphery of the middle leg covering portion 211. On the other hand, the filler poured from the upper opening flows downward into the gap between the end surface of the coil 5 and the inner peripheral surface of the joint covering portion 213 as shown in FIG. 10, and as shown in FIG. Then, it enters the gap between the bottom surface of the coil 5 and the recess 42 of the case 4 and the gap between the bottom surface of the outer leg covering portion 212 and the flat surface 43.

  In the present embodiment, since the outer leg covering portion 212 and the joint leg covering portion 213 and the case 4 are sealed by the protrusion 30, the filler is blocked by the protrusion 30. If the filling of the filler is continued, the liquid level of the filler can be made higher than the minimum height of the wall of the case 4.

  As described above, since the inner periphery and the outer periphery of the coil 5 can be covered with the filler, heat dissipation can be ensured.

  In addition, the resin bodies 21 and 22 in which the E-shaped cores 10a and 10b are embedded are joined so that the legs of the cores 10a and 10b are abutted. Therefore, the filler does not leak out from the joint portion of the resin bodies 21 and 22.

[1-4. effect]
(1) The reactor according to the present embodiment is accommodated in the annular core 10, the coil 5 attached to at least a part of the annular core 10, the case 4 accommodating the annular core 10 and the coil 5, and the case 4. An enclosing member having a wall higher than the lowest height of the wall of the case 4, the wall enclosing the coil 5, and an annular seal member having elasticity and sealing between the enclosing member and the case 4 And a protrusion 30 to be provided.

  Thereby, since the filler can be filled up to a position higher than the height of the wall of the case 4 by filling the enclosure member with the filler, the periphery of the coil 5 can be covered with the filler. In addition, since the protrusions 30 are provided, the filler does not leak out of the case 4 even if the enclosure member is filled with the filler. As a result, heat dissipation can be ensured without increasing the size of the reactor. Therefore, it is possible to achieve both the miniaturization of the reactor and the ensuring of heat dissipation.

  Specifically, in the present embodiment, a resin member 20 that covers the periphery of the annular core 10 is provided, and the annular core 10 is arranged in the center and is provided on the both sides of the middle leg 10A and the middle leg 10A on which the coil 5 is mounted. The resin member 20 has a pair of outer leg portions 10B and a pair of joint legs 10C that connect the end portions of the middle leg portion 10A and the pair of outer leg portions 10B, and the resin member 20 covers the outer leg portion 10B. A pair of outer leg covering portions 212 and a pair of joint leg covering portions 213 that cover the joint leg portion 10C, and the enclosing member is formed from the pair of outer leg covering portions 213 and the pair of joint leg covering portions 213. It was made to become.

  Accordingly, it is not necessary to separately provide an enclosing member while insulating the annular core 10 and the coil 5 from each other, and it is possible to improve the assembling property and reduce the size of the reactor. That is, the resin member 20 covering the periphery of the annular core 10 is originally provided to ensure insulation between the annular core 10 and the coil 5 and is originally accommodated in the case 4. Since the member 20 also functions as an enclosing member for ensuring heat dissipation, it is possible to improve the assemblability and reduce the size of the reactor as much as it is not necessary to provide the enclosing member separately.

(2) The annular core 10 is formed by joining a pair of E-shaped cores 10a and 10b directly or via a gap, and the resin member 20 is formed by joining a pair of E-shaped resin bodies 21 and 22. The protrusion 30 is provided on the bottom surface of the resin member 20.

  Thereby, when assembling the reactor, the protrusion 30 is crushed by pressing the resin member 20 as the enclosing member, and a vessel is formed by the bottom surface of the case 4 and the resin member 20 as the enclosing member. Therefore, there is an advantage that the reactor main body 1 can be easily assembled to the case 4. Moreover, since the protrusion 30 has elasticity, even when the resin bodies 21 and 22 have different sizes when the resin member 20 is pressed, there is an advantage that the variations can be absorbed.

(3) The protrusions 30 are provided on the outer periphery of the bottom surface of the resin member 20. As a result, for example, as shown in FIG. 7, the filler can be filled up to the bottom of the core (here, the outer leg portion and the joint leg portion), so that the heat generated in the core is radiated through the filler. be able to.

(4) The protrusion 30 was made of an elastomer. Accordingly, the resin member 20 can be integrally formed by two-color molding, and the protrusion 30 serving as a seal member can be easily provided on the resin member 20.

(5) On the upper part of the outer leg covering portion 212 and the joint leg covering portion 213, a projecting opening communicating with a space 219 in which the coil 5 surrounded by the pair of outer leg covering portions 212 and the pair of leg covering portions 213 is disposed. 218 is provided. Thereby, while being able to inject | pour a filler easily, a filler can be filled also into the circumference | surroundings of the upper part of a coil, and heat dissipation can be improved further.

[2. Other Embodiments]
The present invention is not limited to the first embodiment, and includes other embodiments described below. Moreover, the present invention also includes a form in which the first embodiment and the following other embodiments are all or any combination thereof. Furthermore, various omissions, replacements, and modifications can be made to these embodiments without departing from the scope of the invention, and modifications thereof are also included in the present invention.

(1) Although the protrusion 30 is provided on the bottom surface of the resin member 20 in the first embodiment, it may be provided between the outer surface of the resin member 20 and the inner wall surface of the case 4. That is, by providing between the outer peripheral side surfaces of the outer leg covering portion 212 and the joint leg covering portion 213 and the inner wall surface of the case 4, the filler can be filled up to the space between them, so that the heat dissipation is further improved. Can do.

(2) Although the protrusion 30 is provided on the bottom surface of the resin member 20 in the first embodiment, it may be provided on the bottom surface of the case 4. For example, an annular groove may be provided in the flat surface 43 on the bottom surface of the case 4 and a sealing member such as an annular packing may be provided in the groove.

(3) In the first embodiment, the surrounding member is configured by the outer covering portion 212 and the joint leg covering portion 213, but may be configured by a cylindrical body such as a square tube. Since the projection is provided at the end of the cylinder and the cylinder is pressed against the bottom surface of the case 4 and the projection 30 is crushed, a vessel is formed by the cylinder and the bottom surface of the case 4. Can be made higher than the minimum height of the wall of the case 4. In this case, the arrangement of the annular core inside the cylinder is arbitrary.

(4) A plate-like body may be used instead of the case 4. That is, the annular core 10 and the coil 5 are installed on the plate-like body, a sealing member such as an O-ring is provided at the end of the cylindrical body, the cylindrical body is provided on the plate-like body via the sealing member, and the cylinder You may make it surround the circumference | surroundings of the annular core 10 and the coil 5 with a shape. The cylindrical body may be filled with a filler and solidified to fix the reactor main body 1 to the plate-like body, or the resin member 20 may be provided with a fixing portion to fix the reactor main body 1 to the plate-like body by screw fastening or the like. You may make it do. The plate-like body may have a curved surface that follows the shape of the coil 5. Moreover, it is good also as a structure similar to 1st Embodiment except replacing case 4 with a plate-shaped object.

DESCRIPTION OF SYMBOLS 1 Reactor main body 10 Annular core 10A Middle leg part 10B Outer leg part 10C Joint leg part 10a, 10b E-shaped core 20 Resin member 21 Resin body 22 Resin body 211 Middle leg covering part 211a Spacer 212 Outer leg covering part 213 Joint leg covering Portions 214, 215 Opening 216 Wall 217 Opening 218 Protruding port 219 Space 30 Protrusion 4 Case 41 Fixing portion 42 Recess 43 Flat 5 Coil

Claims (11)

An annular core;
A coil attached to at least a portion of the annular core;
A case for housing the annular core and the coil;
An enclosure member housed in the case, having a wall higher than the lowest height of the wall of the case, the wall surrounding the coil;
An annular seal member having elasticity and sealing between the enclosure member and the case;
The reactor characterized by providing. A resin member covering the periphery of the annular core;
The annular core includes a middle leg portion disposed in the center and to which the coil is mounted, a pair of outer leg portions disposed on both sides of the middle leg portion, and ends of the middle leg portion and the pair of outer leg portions. A pair of joint legs connecting the parts,
The resin member has a pair of outer leg covering portions that cover the outer leg portions, and a pair of joint leg covering portions that cover the joint legs,
The enclosure member comprises the pair of outer leg covering portions and the pair of joint leg covering portions;
The reactor according to claim 1. The annular core is formed by joining a pair of E-shaped cores directly or through a gap,
The resin member is formed by joining a pair of E-shaped resin bodies,
The sealing member is provided on a bottom surface of the resin member;
The reactor according to claim 2. The seal member is provided on the outer periphery of the bottom surface of the resin member;
The reactor according to claim 3. The seal member is provided between an outer surface of the resin member and an inner wall surface of the case;
The reactor according to claim 2. An annular core;
A coil attached to at least a portion of the annular core;
A plate-like body on which the annular core and the coil are installed;
An enclosing member having a cylindrical shape provided on the plate-like body and enclosing the coil;
An annular seal member having elasticity and sealing between the enclosure member and the plate-like body;
The reactor characterized by providing. A resin member covering the periphery of the annular core;
The annular core includes a middle leg portion disposed in the center and to which the coil is mounted, a pair of outer leg portions disposed on both sides of the middle leg portion, and ends of the middle leg portion and the pair of outer leg portions. A pair of joint legs connecting the parts,
The resin member has a pair of outer leg covering portions that cover the outer leg portions, and a pair of joint leg covering portions that cover the joint legs,
The enclosure member comprises the pair of outer leg covering portions and the pair of joint leg covering portions;
The reactor according to claim 6. The annular core is formed by joining a pair of E-shaped cores directly or through a gap,
The resin member is formed by joining a pair of E-shaped resin bodies,
The sealing member is provided on a bottom surface of the resin member;
The reactor according to claim 7. The seal member is provided on the outer periphery of the bottom surface of the resin member;
The reactor according to claim 8. Protrusions that communicate with the space in which the coils surrounded by the pair of outer leg covering portions and the pair of leg covering portions are disposed are provided on the outer leg covering portions and the joint leg covering portions. Being
The reactor according to any one of claims 2 to 5 and 7 to 9. The seal member is an elastomer;
The reactor in any one of Claims 1-10 characterized by these.

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