Capacitor device and joint for capacitor

Abstract

To provide a capacitor device and a joint for capacitors, which can hold a plurality of capacitor elements in a collected and combined state, with a simple operation.SOLUTION: The capacitor device includes a plurality of capacitor elements 1 which are arranged so that winding cores 11 are arranged in a lateral direction, and a joint portion 2 which holds the plurality of capacitor elements 1. The joint portion 2 has a plurality of connection portions 4 which are connected to the respective winding cores 11 of the plurality of capacitor elements 1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a capacitor device and a capacitor joint. [Background technology]

[0002] Conventionally, there has been known a capacitor device in which a plurality of capacitor elements are assembled and electrically connected to each other (see, for example, Patent Document 1). In this type of capacitor device, for example, the outer circumference of the assembled plurality of capacitor elements is wrapped with a plastic film, so that the plurality of capacitor elements are fixed to each other. The plurality of capacitor elements are housed in a case, and, for example, the case is filled with a molding resin.

[0003] In this way, by fixing a plurality of capacitor elements to one another with a plastic film, the plurality of capacitor elements can be easily handled when housed in a case. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-55759 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the task of winding a plastic film around a plurality of capacitor elements is problematic in that it is time-consuming and requires a relatively long time to complete, and depending on the capacity of the capacitor device, it may be necessary to wind the plastic film around many capacitor elements, which requires even more time and effort.

[0006] An object of the present invention is to provide a capacitor device and a capacitor joint that are capable of holding a plurality of capacitor elements in an assembled state with a simple operation. [Means for solving the problem]

[0007] A capacitor device according to one aspect of the present invention includes a winding core, a plurality of capacitor elements arranged so that the winding core is aligned in a horizontal direction, and a joint portion that holds the plurality of capacitor elements. The joint portion has a plurality of connection portions connected to the winding cores of the plurality of capacitor elements.

[0008] A capacitor device according to one aspect of the present invention includes a plurality of capacitor elements each having a winding core, the winding core being aligned in a straight line, and a joint portion disposed between adjacent capacitor elements of the plurality of capacitor elements to hold the adjacent capacitor elements. The joint portion has a plurality of connection portions connected to the winding core of each of the plurality of capacitor elements.

[0009] A capacitor joint of one embodiment of the present invention is a capacitor joint that holds a plurality of capacitor elements having a winding core, and includes a plurality of connection portions that are connected to the winding cores of each of the plurality of capacitor elements, and a connecting portion that connects the plurality of connection portions together. Effect of the Invention

[0010] The capacitor device and capacitor joint according to the above aspects of the present invention have the advantage that a plurality of capacitor elements can be held in an assembled state by a simple operation. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a capacitor element assembly in a capacitor device according to a first embodiment. [Diagram 2] Fig. 2(A) is a perspective view of a joint (capacitor joint) according to the first embodiment, and Fig. 2(B) is a front view of the joint (capacitor joint) according to the first embodiment. [Diagram 3]Fig. 3(A) is a cross-sectional view of the joint (capacitor joint) according to the first embodiment just before it is connected to the winding core of the capacitor element. Fig. 3(B) is a cross-sectional view of the joint (capacitor joint) according to the first embodiment in a state where it is connected to the winding core of the capacitor element. [Figure 4] FIG. 4 is a perspective view of a capacitor element assembly in a capacitor device according to the second embodiment. [Diagram 5] Fig. 5(A) is a perspective view of a joint (capacitor joint) according to a second embodiment, and Fig. 5(B) is a cross-sectional view of the joint (capacitor joint) according to the second embodiment in a state where it is connected to a winding core of a capacitor element. [Figure 6] FIG. 6 is a cross-sectional view of a joint (capacitor joint) according to a modified example of the second embodiment, in a state where it is connected to a winding core of a capacitor element. [Figure 7] FIG. 7 is a perspective view of a capacitor element assembly in a capacitor device according to the second modification. [Figure 8] FIG. 8 is a perspective view of a joint (a capacitor joint) according to the second modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] First Embodiment The capacitor device according to this embodiment is a capacitor in which an assembly of a plurality of capacitor elements 1 (sometimes referred to as a capacitor element assembly 10) is housed in a case, and the case is filled with an insulating material. In this embodiment, the insulating material is a molding resin. Examples of the molding resin include epoxy resin, silicone resin, and urethane resin. The insulating material is not limited to molding resin, and may be, for example, insulating gas, insulating oil, and the like.

[0013] Fig. 1 shows only capacitor element assembly 10, and does not show the case and insulating material. As shown in Fig. 1, capacitor element assembly 10 includes a plurality of capacitor elements 1 having a winding core 11, and a joint portion 2 (capacitor joint) that holds the plurality of capacitor elements 1. As shown in Fig. 2, the joint portion 2 has a plurality of connection portions 4 that are connected to the winding core 11 of the plurality of capacitor elements 1.

[0014] With this configuration, multiple capacitor elements 1 can be held by joint part 2 simply by connecting winding core 11 of capacitor element 1 to connection part 4 of joint part 2. Therefore, multiple capacitor elements 1 can be held in an assembled state by a simple operation, and are easy to handle in subsequent operations (such as placing them in a case and filling them with an insulating material).

[0015] For the sake of convenience, the "front-rear direction" is defined as shown in Figure 1, and the direction perpendicular to the front-rear direction and parallel to the horizontal plane is defined as the "left-right direction." Additionally, the direction perpendicular to the left-right and front-rear directions is defined as the "up-down direction." However, these definitions are merely for the sake of explanation and are not intended to specify the manner of use.

[0016] In this specification, "parallel" refers not only to two straight lines, surfaces, etc. (hereinafter referred to as "straight lines") that do not intersect even when extended, but also to two straight lines, etc. that intersect at an angle of 10° or less. Additionally, "orthogonal" refers to two straight lines, etc. that intersect at an angle of 90°±10°. However, even if two straight lines, etc. do not intersect directly, if they intersect when extended, they are included in the term "orthogonal."

[0017] (Capacitor element 1) Capacitor element 1 is a film capacitor in which dielectric film 13 is wound around winding core 11. Capacitor element 1 is preferably a metallized film capacitor (MF capacitor). In capacitor element 1, metallikon (electrodes) are arranged so as to face both ends in the width direction (both ends in the central axis direction) of the wound dielectric film 13. In the central axis direction of capacitor element 1, winding core 11 protrudes from the metallikon.

[0018] The winding core 11 extends over the entire length of the capacitor element 1 in the longitudinal direction, and in this embodiment, the central axis of the winding core 11 is parallel to the vertical direction. The winding core 11 is cylindrical, and an opening at one end in the longitudinal direction is in communication with an opening at the other end. Examples of materials for the winding core 11 include synthetic resins such as polybutylene terephthalate, FRP (Fiberglass Reinforced Plastics), and the like.

[0019] As shown in Fig. 1, the multiple capacitor elements 1 are arranged so that the winding cores 11 are lined up in the horizontal direction. The central axes of the winding cores 11 are parallel to each other. Arranging the capacitor elements 1 so that the winding cores 11 are lined up in the horizontal direction has the advantage that the multiple capacitor elements 1 can be easily electrically connected in parallel. The "horizontal direction" here means the direction perpendicular to the central axis of the winding core 11, and also includes the front-rear direction and the left-right direction.

[0020] The capacitor element assembly 10 has two or more capacitor elements 1. In this embodiment, the capacitor element assembly 10 is an assembly of six capacitor elements 1, but may be an assembly of, for example, 100 or more capacitor elements 1.

[0021] (Joint 2) 2(A) and 2(B), the joint part 2 (sometimes referred to as a capacitor joint) includes a plurality of connection parts 4 and a linking part 3 that connects the plurality of connection parts 4 together. In the joint part 2, the connection parts 4 and the linking parts 3 are preferably formed integrally. An insulating material is used as the material of the joint part 2, and for example, the same material as the material of the winding core 11 can be used.

[0022] (Connection 4) The connection part 4 is a part that is connected to the winding core 11. The connection part 4 extends along the central axis of the winding core 11. The multiple connection parts 4 are arranged at intervals in the horizontal direction. The longitudinal directions of the multiple connection parts 4 are parallel to each other. The connection part 4 according to this embodiment is cylindrical.

[0023] 3, the connection part 4 is preferably inserted into the winding core 11, and more preferably fitted inside the winding core 11. Here, "fitted" means that the outer peripheral surface of the connection part 4 is in contact with the inner peripheral surface of the winding core 11 over substantially the entire circumference, and is fitted in to such an extent that the capacitor element 1 does not fall off from the connection part 4. The tip of the connection part 4 may be formed in a tapered shape so that the diameter becomes smaller toward the tip.

[0024] Even if the connecting part 4 has an outer diameter slightly smaller than the inner diameter of the winding core 11 so that it is inserted into the winding core 11 without being fitted, the connecting part 4 can maintain a connected state by the engaging part 12 and the engaged part 43. The engaging part 12 is formed on the inner peripheral surface of the winding core 11 as shown in FIG. 3(A). Also, the engaged part 4 is formed on the outer peripheral surface of the connecting part 4 with which the engaging part 12 is hooked. In this embodiment, the engaging part 12 is a groove 121, and the engaged part 43 is a plurality of protrusions 431. However, the engaging part 12 may be a protrusion and the engaged part 43 may be a groove.

[0025] It is preferable that groove 121 is formed over the entire circumferential direction of the inner peripheral surface of winding core 11. This makes it easier for protrusion 431 to be caught in groove 121. In addition, protrusion 431 may be formed over the entire circumferential direction of the outer peripheral surface of the connection portion, or may be formed partially in the circumferential direction.

[0026] It is preferable that the projection 431 elastically changes in projection dimension with respect to the outer circumferential surface of the connection part 4. The projection 431 may be, for example, a sphere disposed in a hole formed on the outer circumferential surface of the connection part 4. An external force is applied to the sphere in the radial outward direction by an elastic body (for example, a torsion coil spring). The sphere protruding from the outer circumferential surface of the connection part 4 moves in the radial direction to be hooked into the groove 121. The projection 431 may also be, for example, an elastic body such as rubber or soft resin attached to the outer circumferential surface of the connection part 4. A pair of slits extending in the central axis direction may be formed on both sides in the circumferential direction of the projection 431, and a part of the peripheral wall of the connection part 4 on which the projection 431 is formed may be configured to be elastically deformable.

[0027] The connection state between the connection part 4 and the winding core 11 may be such that the connection part 4 is fitted into the winding core 11 and the engagement part 12 is hooked onto the engaged part 43.

[0028] The overlap dimension of the connection part 4 with respect to the winding core 11 is preferably 0.7 to 3 times, more preferably 1 to 2.5 times, and even more preferably 1.2 to 2 times, the outer diameter of the connection part 4. With this configuration, it is possible to ensure the force required to hold the connection while maintaining the ease of connecting the connection part 4 to the winding core 11.

[0029] (Connection part 3) As shown in FIG. 2(A), the connecting portion 3 connects the multiple connection portions 4 together. The connecting portion 3 has a certain level of rigidity. The connecting portion 3 is a plate-like shape that spreads on a virtual plane perpendicular to the central axis of the connecting portion 4. The connecting portion 3 is configured by a frame body 31 having an opening formed therein that penetrates in the vertical direction at the center. The opening is rectangular, but may be, for example, circular, elliptical, multiple slots, triangular, pentagonal, or the like. This configuration makes it easy to electrically connect the multiple capacitor elements 1 with lead wires or the like, and makes it easy to obtain a so-called anchor effect when embedded in the molding resin. The connecting portion 3 is not limited to a plate-like shape, and may be, for example, a round bar shape, a block shape, or the like.

[0030] As shown in FIG. 2(B), the connecting portion 3 has a first surface 32 and a second surface 33 opposite to the first surface 32. In the present embodiment, the connecting portion 3 has a plurality of connection portions 4 provided only on the first surface 32. The joint portion 2 preferably has a plurality of through holes 5 penetrating the tip surface of the connection portion 4 and the second surface 33 of the connecting portion 3. In the present embodiment, the through holes 5 are composed of an air vent hole formed in the connecting portion 3 and a hollow portion of the cylindrical connecting portion 4. The air vent hole penetrates from the first surface 32 to the second surface 33 of the connecting portion 3 and communicates with the inside of the connecting portion 4. With this configuration, the gas in the winding core 11 can be vented when filling with the molding resin.

[0031] <Second embodiment> Next, a second embodiment of the present invention will be described. In the first embodiment, the winding cores 11 of the multiple capacitor elements 1 are arranged so as to line up in the horizontal direction, but in this embodiment, as shown in Fig. 4, the winding cores 11 of the multiple capacitor elements 1 are arranged so as to line up in a straight line. By arranging the capacitor elements 1 so that the winding cores 11 are arranged in a straight line, there is an advantage that the capacitor elements 1 can be easily electrically connected in series. Note that the capacitor device of this embodiment is largely the same as the first embodiment, and therefore the same components are denoted by the same reference numerals as in the first embodiment, and duplicated explanations will be omitted.

[0032] The joint part 2 according to this embodiment is disposed between adjacent capacitor elements 1 and holds the adjacent capacitor elements 1. As shown in Fig. 5, the joint part 2 includes a linking part 3 and a pair of connection parts 4 (hereinafter referred to as a first connection part 41 and a second connection part 42) formed on both ends of the linking part 3 in the central axis direction. The joint part 2 is formed integrally with the linking part 3 and the pair of connection parts 41, 42, and is formed as a whole in a cylindrical shape having a central axis in the vertical direction.

[0033] The first connection portion 41 protrudes upward from the upper end of the connecting portion 3. The second connection portion 42 protrudes downward from the lower end of the connecting portion 3. The first connection portion 41 and the second connection portion 42 protrude in opposite directions from the connecting portion 3. Note that in Fig. 5, the boundary line between the first connection portion 41 and the connecting portion 3 and the boundary line between the second connection portion 42 and the connecting portion 3 are shown by imaginary lines, but in reality, the boundary line may or may not appear.

[0034] An engaged portion 43 is formed on each of the first connection portion 41 and the second connection portion 42. Similarly to the first embodiment, an engaging portion 12 is formed on the winding core 11. This connects the first connection portion 41 to the upper winding core 11, and connects the second connection portion 42 to the lower winding core 11. Note that, similar to the first embodiment, the connection portions 41, 42 and the winding core 11 may be connected only by fitting.

[0035] Even with capacitor element assembly 10 having such a configuration, multiple capacitor elements 1 can be held in an assembled state by a simple operation, as in the first embodiment, and is easy to handle in subsequent operations.

[0036] <Modification> The above embodiment is merely one of various embodiments of the present invention. The embodiment can be modified in various ways depending on the design, etc., as long as the object of the present invention can be achieved. Modifications of the embodiment are listed below. The modifications described below can be applied in appropriate combination.

[0037] (1) Variation 1 The joint part 2 in the second embodiment was a separate member from the winding core 11, but for example, as shown in FIG. 6, only one of the first connection part 41 and the second connection part 42 may be integrally connected to the winding core 11. In a joint part 2 according to one modification, the second connection part 42 is integrally connected to the winding core 11 of the lower capacitor element 1. The first connection part 41 is fitted inside the winding core 11 and connected to it.

[0038] (2) Variation 2 In the joint part 2 of the first embodiment, the multiple connection parts 4 are provided only on one surface (first surface 32) of the coupling part 3, but as shown in Figures 7 and 8, the multiple connection parts 4 may be provided on both surfaces in the thickness direction of the coupling part 3. This makes it easier to electrically connect the multiple capacitor elements 1 in both series and parallel.

[0039] In the joint part 2 (capacitor joint), two connection parts 41 and 42 are arranged in a straight line along the central axis and face opposite each other. The opening surface of the tip surface of the first connection part 41 and the opening surface of the tip surface of the second connection part 42 communicate with each other.

[0040] (3) Other modifications In the above embodiment, the engaging portion 12 formed on the inner peripheral surface of the winding core 11 is the groove 121 extending in the circumferential direction, but the engaging portion 12 may be, for example, a slit extending in the vertical direction. The slit may or may not penetrate the peripheral wall of the winding core 11. The engaged portion 43 is hooked onto the engaging portion 12 by inserting the protrusion 431 (engaged portion 43) of the connection portion 4 into the slit. Also, a cut may be provided in the circumferential direction from the slit. This makes it difficult for the joint portion 2 to fall off from the winding core 11 by rotating the capacitor element 1 around the central axis after inserting the protrusion 431 into the slit.

[0041] The inner diameter of the connection part 4 may be formed to be equal to or larger than the outer diameter of the winding core 11. In this case, the winding core 11 is inserted into the connection part 4. The connection part 4 may also be a through hole formed in the coupling part 3 to have the same size as the outer diameter of the winding core 11.

[0042] The connecting portion 4 does not have to be cylindrical. For example, the connecting portion 4 may be formed only of the closest semicircular arc portions between adjacent connecting portions 4, or may be formed only of the most distant semicircular arc portions. Similarly, the end of the winding core 11 that is connected to the connecting portion 4 may also be formed of a semicircular arc portion. The connecting portion 4 may also be formed in a solid cylindrical shape.

[0043] The multiple capacitor elements 1 may be electrically connected to each other via lead wires, or may be electrically connected to each other via wiring fittings.

[0044] Although the joint part 2 is connected to only one end in the central axis direction of the winding core 11 of the capacitor element 1, two joint parts 2 may be connected to both ends in the central axis direction of the winding core 11. This makes it possible to hold multiple capacitor elements 1 more stably.

[0045] In embodiment 1, six capacitor elements 1 are held by one joint portion 2, but multiple capacitor element assemblies in which multiple capacitor elements 1 are held by one joint portion 2 may be constructed, and the joint portions 2 may be connected to each other to form a single capacitor element assembly 10.

[0046] <Summary> As described above, the capacitor device according to the first embodiment includes a plurality of capacitor elements 1 arranged such that the winding cores 11 are aligned in the horizontal direction, and a joint portion 2 that holds the plurality of capacitor elements 1. The joint portion 2 has a plurality of connection portions 4 that are connected to the winding cores 11 of each of the plurality of capacitor elements 1. According to this embodiment, multiple capacitor elements 1 can be held by joint part 2 simply by connecting winding core 11 of capacitor element 1 to connection part 4 of joint part 2. Therefore, multiple capacitor elements 1 can be held in an assembled state by a simple operation, and are easy to handle in subsequent operations (such as placing them in a case or filling them with an insulating material).

[0047] In the capacitor device of the second aspect, in the first aspect, each of the multiple connection portions 4 extends along the central axis of the winding core 11, and the joint portion 2 has a plate-shaped connecting portion 3 that connects the multiple connection portions 4 together. According to this embodiment, since the connection part 4 extends along the central axis of the winding core 11, wobbling between the connection part 4 and the winding core 11 can be reduced, and a stable connection state can be obtained.

[0048] In the capacitor device according to the third embodiment, in the second embodiment, each winding core 11 of the multiple capacitor elements 1 is cylindrical. The multiple connection parts 4 are provided only on one surface of the coupling part 3 in the central axis direction. The joint part 2 has multiple through holes 5 that penetrate between the tip surfaces of each of the multiple connection parts 4 and the other surface of the coupling part 3 in the central axis direction. According to this embodiment, when a plurality of capacitor elements 1 are housed in a housing and a molding resin is filled, gas within winding core 11 can be released through through hole 5.

[0049] The capacitor device according to the fourth aspect includes a plurality of capacitor elements 1 each having a winding core 11 and arranged so that the winding cores 11 are aligned in a straight line, and a joint portion 2 arranged between adjacent capacitor elements 1 of the plurality of capacitor elements 1 to hold the adjacent capacitor elements 1. The joint portion 2 has a plurality of connection portions 4 connected to the winding cores 11 of each of the plurality of capacitor elements 1. According to this embodiment, multiple capacitor elements 1 can be held by joint part 2 simply by connecting winding core 11 of capacitor element 1 to connection part 4 of joint part 2. Therefore, multiple capacitor elements 1 can be held in an assembled state by a simple operation, and are easy to handle in subsequent operations.

[0050] In the capacitor device according to the fifth aspect, in the fourth aspect, the multiple connection portions 4 protrude in opposite directions to each other in the direction along the central axis. According to this embodiment, joint portion 2 can have a simple shape, improving manufacturability, and capacitor elements 1 adjacent to each other in the central axis direction can be held as close as possible to each other.

[0051] In the capacitor device according to the sixth aspect, in any one of the first to fifth aspects, each of the winding cores 11 of the multiple capacitor elements 1 is cylindrical, and each of the multiple connection portions 4 is fitted into the respective winding cores 11. According to this embodiment, the degree of freedom in designing the connection portion 4 can be improved, so that the length can be set to a length suitable for connection with the winding core 11.

[0052] In the capacitor device according to the seventh aspect, in any one of the first to sixth aspects, the winding core 11 of each of the plurality of capacitor elements 1 is cylindrical. Each of the plurality of connection parts 4 is inserted into the respective winding core 11. Each of the winding cores 11 has an engaging part 12 formed on its inner circumferential surface. Each of the plurality of connection parts 4 has an engaged part 43 formed on its outer circumferential surface and hooked onto the engaging part 12. According to this embodiment, the connection state between the joint 4 and the winding core 11 can be made more stable.

[0053] A capacitor joint according to a seventh aspect is a capacitor joint that holds a plurality of capacitor elements 1 having winding cores 11. The capacitor joint includes a plurality of connection parts 4 that are connected to the winding cores 11 of the plurality of capacitor elements 1, and a linking part 3 that connects the plurality of connection parts 4 together. According to this embodiment, a plurality of capacitor elements 1 can be held simply by connecting the winding core 11 of the capacitor element 1 to the connection portion 4 of the capacitor joint. Therefore, a plurality of capacitor elements 1 can be held in an assembled state by a simple operation, and the capacitor element assembly 10 can be easily handled during subsequent operations. [Explanation of symbols]

[0054] 10 Aggregate 1 Capacitor element 11 Winding core 12 Engagement part 121 Groove 2 Joint (condenser joint) 3 Connecting part 31 Frame 4 Connection 41 First connection part 42 Second connection part 43 Engaged part 431 Protrusion 5 Through holes

Claims

1. A plurality of capacitor elements each having a winding core, the winding core being arranged in a lateral direction; a joint portion for holding the plurality of capacitor elements; Equipped with the joint portion has a plurality of connection portions connected to the winding cores of the plurality of capacitor elements, Capacitor device.

2. Each of the plurality of connection portions extends along a central axis of the winding core, The joint portion has a plate-shaped connecting portion that connects the multiple connection portions together, The capacitor device of claim 1 .

3. a winding core of each of the plurality of capacitor elements is cylindrical; the plurality of connection portions are provided on only one surface of the coupling portion in the central axis direction, The joint portion has a plurality of through holes penetrating a tip surface of each of the plurality of connection portions and the other surface of the coupling portion in the central axis direction. The capacitor device according to claim 2 .

4. A plurality of capacitor elements each having a winding core, the winding core being arranged in a straight line; a joint portion disposed between adjacent capacitor elements of the plurality of capacitor elements and configured to hold the adjacent capacitor elements; Equipped with the joint portion has a plurality of connection portions connected to the winding cores of the plurality of capacitor elements, Capacitor device.

5. The plurality of connection portions protrude in opposite directions to each other in a direction along the central axis of the winding core. The capacitor device according to claim 4 .

6. a winding core of each of the plurality of capacitor elements is cylindrical; Each of the plurality of connection portions is fitted into each of the winding cores. The capacitor device according to any one of claims 1 to 5.

7. a winding core of each of the plurality of capacitor elements is cylindrical; Each of the plurality of connection portions is inserted into each of the winding cores, Each of the winding cores has an engagement portion formed on an inner peripheral surface, Each of the plurality of connection portions has an engaged portion formed on an outer circumferential surface thereof and hooked onto the engaging portion. The capacitor device according to any one of claims 1 to 5.

8. A capacitor joint for holding a plurality of capacitor elements having a winding core, a plurality of connection portions connected to the winding cores of the plurality of capacitor elements; A coupling portion that connects the plurality of connection portions together; Equipped with Capacitor fittings.

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