JP2011192783A - Capacitor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily provide a configuration in which the number of series stages is increased by one capacitor element by parting one conductor foil in a winding direction. <P>SOLUTION: The capacitor device includes the capacitor element 1 such that two sheets of conductor foils 2, 4, 5 are wound as a pair of electrodes as many times as predetermined turns in a state wherein two sheets of conductor foils 2, 4, 5 are insulated from each other by a dielectric sheet, wherein winding-side parts 4a and 5a of conductor foils 4 and 5 of one side are protruded from the dielectric sheet to one side in the winding direction to be led out as one electrode, and a winding-side part 2a of the conductor foil 2 of the other side is protruded from the dielectric sheet to the other side in the winding direction to be led out as the other electrode. At least the conductor foils 4 and 5 of the one side between the two sheets of conductor foils 2, 4, 5 are parted in the winding direction, and wound with an insulator sheet 8, dividing the capacitor element 1 inside into a plurality of capacity units, interposed between parted end parts 4b and 5b, and a winding-side part 8a of the insulator sheet 8 is interposed at the one side in the winding direction between the winding-side parts 4a and 5a of the conductor foils 4 and 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, for example, two conductor foils are wound as a pair of electrodes, such as a power capacitor, in a state where the conductor foils are insulated by a dielectric sheet, and the capacitance between the electrodes is The present invention relates to a capacitor device in which a capacitor element is formed.

  In a capacitor device used for electric power, two conductive foils are used as a pair of electrodes, and the conductive foil and the dielectric sheet are superposed and wound in a state where the conductive foil is insulated by the dielectric sheet. There is a power capacitor having a structure in which a capacitor element is formed by rotating and rotating, and a capacitor element is formed by electrostatic capacitance between the electrodes, and the capacitor element is housed in a case and immersed in insulating oil (see, for example, Patent Documents 1 and 2).

  A capacitor element 101 incorporated in this type of capacitor device is shown in FIGS. 10 is a perspective view showing a conventional capacitor element 101, FIG. 11 is a view taken in the direction of arrow D in FIG. 10, FIG. 12 is a cross-sectional view taken along line EE in FIG. 10, and FIG. FIG. In each figure, the winding state of the conductive foils 102 and 104 and the dielectric sheet 107, the thickness of the capacitor element 101, and the like are exaggerated. Further, the outermost dielectric sheet is not shown.

  As shown in the figure, the capacitor element 101 has a structure in which conductive foils 102 and 104 such as aluminum and dielectric sheets 107 such as plastic films are alternately overlapped and wound. Depending on the number of turns in which the conductive foils 102 and 104 and the dielectric sheet 107 are wound, as shown in the equivalent circuit of FIG. 14, the electrostatic capacitance between the pair of electrodes formed by the two conductive foils 102 and 104 is shown. A capacitor element 101 having a capacitance is formed.

  In this capacitor element 101, of the two conductor foils 102 and 104 constituting a pair of electrodes, the winding side portion 102a of one conductor foil 102 is placed on one side in the winding direction on the dielectric sheet 107. It is drawn out as a single electrode by projecting it more than once, and the winding side portion 104a of the other conductor foil 104 is projected beyond the dielectric sheet 107 to the other side in the winding direction. In this case, the other electrode is pulled out by caulking and connecting together. In the figure, drawing of the electrode is schematically shown with the caulking connection state described above omitted.

JP-A-8-167539 JP 2000-306768 A

  By the way, in the above-described conventional capacitor device, the capacitor element 101 is connected by caulking and connecting the winding side portion 104a of one conductor foil 104 in one direction in the winding direction. And having a structure in which the winding side portion 102a of the other conductor foil 102 protrudes to the other side in the winding direction and is collectively crimped and connected as the other electrode. Therefore, it had the following problems.

  That is, when it is going to obtain the structure which increased the number of series steps with one capacitor | condenser element 101, one conductor foil 104 is parted with respect to the winding direction, and it is a separate electrode from each of the parted conductor foil. A structure that draws

  However, even if one conductor foil 104 is divided in the winding direction as described above, each of the divided conductor foils causes the winding side portion 104a to protrude in one of the winding directions. Therefore, the two conductor foils are in contact with each other before and after being divided, or the two conductor foils that are divided are contacted by caulking connection, and are electrically connected. Become. Therefore, it is not possible to obtain a configuration in which the number of series stages is increased by one capacitor element 101 by dividing one conductor foil 104 in the winding direction.

  Therefore, the present invention has been proposed in view of the problems described above, and the object is to increase the number of series stages with one capacitor element by dividing one conductor foil in the winding direction. It is an object of the present invention to provide a capacitor device that can be easily realized.

  As a technical means for achieving the above-mentioned object, the present invention uses two conductor foils as a pair of electrodes and winds a predetermined number of turns in a state where the conductor foils are insulated by a dielectric sheet. Of the conductor foils, the winding side portion of one conductor foil protrudes from the dielectric sheet to one side in the winding direction and is drawn out as one electrode, and the winding of the other conductor foil A capacitor device having a capacitor element in which a side portion protrudes from the dielectric sheet to the other side in the winding direction and is drawn out as the other electrode, and at least one of the two conductor foils The foil is divided with respect to the winding direction, and an insulating sheet that divides the capacitor element into a plurality of capacitance units is interposed between the divided ends, and the foil is wound together with the conductive foil. Conductor on one side of the winding side of the winding side Characterized in that interposed between the winding side.

  In the present invention, of the two conductor foils, at least one conductor foil is divided with respect to the winding direction, and the insulator sheet is wound between the divided end portions, and the insulator sheet is wound. Thus, the capacitor element can be divided into a plurality of capacitance units internally by interposing the winding side portion of the conductive wire between the winding side portions of the conductor foil on one side in the winding direction. As a result, it is easy to realize a configuration in which the number of series stages is increased with one capacitor element. In addition, by dividing the above-described capacitor element into a plurality of capacitance units, a configuration such as a three-phase star connection is possible in addition to a configuration in which the number of series stages is increased.

  Note that “dividing at least one conductor foil with respect to the winding direction” means that both the one conductor foil and the other conductor foil are also divided. When both the body foil and the other conductor foil are divided, the number of series stages can be further increased with one capacitor element.

  The insulator sheet in the present invention preferably has a structure in which the divided end portions of one conductor foil are spaced apart and the entire insulator sheet is juxtaposed with the one conductor foil between the divided end portions. In this way, since all of the insulator sheet is interposed between the separated end portions that are spaced apart from each other, it is ensured that the capacitor element is internally divided into a plurality of capacitance units, and the conductor foil and Since the insulator sheet can be separated and wound, the winding work becomes easy.

  In this case, a structure in which the other conductor foil is divided in the winding direction at the same dividing position as one conductor foil and the conductor foil between the divided end portions is removed is desirable. In this way, since both the one conductor foil and the other conductor foil can be divided at the same time, the dividing operation can be simplified and the cost can be easily reduced.

  The present invention is applicable to a capacitor device having a structure in which a capacitor element is housed in a case and immersed in an insulating medium, that is, a power capacitor. The present invention can also be applied to a capacitor device having a structure other than a power capacitor in which a capacitor element is housed in a case and immersed in an insulating medium.

  According to the present invention, at least one of the two conductor foils is divided with respect to the winding direction, and the insulator sheet is interposed between the divided end portions and wound together with the conductor foil. The capacitor element is internally divided into a plurality of capacity units by turning and interposing the winding side portion of the insulator sheet between the winding side portions of the conductor foil on one side in the winding direction. Can do. As a result, it becomes easy to realize a configuration in which the number of series stages is increased with one capacitor element.

  That is, of the two conductor foils, the winding side portion of one conductor foil is protruded from the dielectric sheet to one side in the winding direction and drawn out as one electrode, and the other conductor foil Even if the capacitor element has a structure in which the winding side portion of the capacitor protrudes from the dielectric sheet to the other side of the winding direction and is drawn out as the other electrode, one capacitor element is internally provided with a plurality of capacitance units. Can be realized, and it becomes easy to meet the needs for improving the withstand voltage of the capacitor element.

It is a perspective view showing a capacitor element in an embodiment of the present invention. It is an A direction arrow directional view of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG. FIG. 2 is an equivalent circuit diagram showing a two-series capacitor element in which a part of an insulator sheet is interposed between one conductor foil in the embodiment of FIG. 1. In other embodiment of this invention, it is an equivalent circuit schematic which shows the capacitor | condenser element of the three-phase star connection which inserted a part of insulator sheet between one conductor foil. In other embodiment of this invention, it is an equivalent circuit diagram which shows the 2 series capacitor | condenser element which has arrange | positioned all the insulator sheets between one conductor foil. In other embodiment of this invention, it is an equivalent circuit schematic which shows the 2 series capacitor | condenser element which arrange | positioned all the insulator sheets between one conductor foil, and removed the other conductor foil. In other embodiment of this invention, it is an equivalent circuit schematic which shows the 4-series capacitor | condenser element which has arrange | positioned a part of insulator sheet between both conductor foils. It is a perspective view which shows the conventional capacitor | condenser element. It is a D direction arrow directional view of FIG. It is sectional drawing which follows the EE line | wire of FIG. It is sectional drawing which follows the FF line | wire of FIG. It is an equivalent circuit schematic which shows the capacitor | condenser element of FIG.

  An embodiment of a capacitor device according to the present invention will be described in detail below. In the following embodiment, a capacitor device having a structure in which a capacitor element is housed in a case and immersed in an insulating oil as an insulating medium, that is, a case where the capacitor element is applied to a power capacitor will be described. The present invention can also be applied to a capacitor device having a structure other than an electric energy capacitor in which an element is housed in a case and immersed in insulating oil.

  The capacitor | condenser element integrated in the capacitor | condenser for electric power in embodiment is shown in FIGS. 1 is a perspective view showing a capacitor element of this embodiment, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. 1, and FIG. It is sectional drawing which follows a line. In each figure, the winding state of the conductor foils 2, 4, 5 and the dielectric sheet 7 and the thickness of the capacitor element 1 are exaggerated. Further, the outermost dielectric sheet is not shown.

  As shown in the figure, the capacitor element 1 has a structure in which conductor foils 2, 4, 5 such as aluminum and a dielectric sheet 7 such as a plastic film are alternately overlapped and wound. The capacitor element 1 having the capacitance between the electrodes constituted by the conductor foils 2, 4, 5 is formed by the number of turns in which the conductor foils 2, 4, 5 and the dielectric sheet 7 are wound. .

  In this capacitor element 1, of the conductor foils 2, 4 and 5 constituting the electrodes, the winding side portions 4a and 5a of one of the conductor foils 4 and 5 are disposed on one side in the winding direction. 7 is projected as one electrode by being crimped and connected together, and the winding side portion 2a of the other conductor foil 2 is projected beyond the dielectric sheet 7 to the other side in the winding direction. Thus, the structure is drawn out as the other electrode by performing caulking and connecting together. In the figure, drawing of the electrode is schematically shown with the caulking connection state described above omitted.

  Here, of the conductor foils 2, 4 and 5, one of the conductor foils 4 and 5 is divided in the winding direction, and a plurality of capacitor elements 1 are internally provided between the divided ends 4b and 5b. Is wound with an insulating sheet 8 (refer to the alternate long and short dash line in the figure) interposed therebetween, and the winding side portion 8a of the insulating sheet 8 is wound in the same direction as the one of the conductive foils 4 and 5. It projects beyond the dielectric sheet 7 on one side of the. That is, the winding side portion 8a of the insulator sheet 8 is interposed between the winding side portions 4a and 5a of the conductor foils 4 and 5 on one side in the winding direction. In addition, the winding side part 8a of the insulator sheet 8 protrudes slightly longer than the winding side parts 4a and 5a of the conductor foils 4 and 5 as shown in FIG. Make sure to prevent it.

  In this way, one of the conductor foils 4 and 5 is divided with respect to the winding direction, and the insulating sheet 8 that divides the capacitor element 1 into a plurality of capacitance units internally between the divided ends 4b and 5b. Is interposed between the winding side portions 4a and 5a of the conductor foils 4 and 5 on one side in the winding direction. The winding side portions 4a and 5a of the conductor foils 4 and 5 are protruded to one side in the winding direction so that the winding end portions 4a of the conductor foil 4 are caulked and connected to each other. If the winding end portions 5a are caulked and connected to each other, the insulating sheet 8 is interposed, so that the two conductive foils 4 and 5 are in contact with each other before or after being divided, or the divided conductive foil 4 is used. And the conductive foil 5 do not come into contact with each other by caulking connection and are not electrically short-circuited.

  The insulator sheet 8 has a winding length of one or more turns of the conductor foils 4 and 5, and one insulator sheet 8 is provided between the divided end portions 4 b and 5 b of one conductor foil 4 and 5. The remaining portion is wound together with the conductive foils 4 and 5. Thus, when the insulator sheet 8 has a winding length of one or more turns of the conductor foils 4 and 5, a part of the insulator sheet 8 is separated from the divided end portions 4 b and 4 b of the conductor foils 4 and 5. The winding side portion 8a of the insulator sheet 8 can be interposed between the winding side portions 4a and 5a of the conductor foils 4 and 5 on one side in the winding direction only by being inserted between 5b. The conductor foil 4 and the conductor foil 5 can be reliably divided.

  In this way, one of the two conductor foils 2, 4 and 5 is divided at one place with respect to the winding direction and insulated between the divided ends 4b and 5b. By interposing the body sheet 8, the capacitor element 1 is divided into two capacitor elements 1 a and 1 b as shown in the equivalent circuit of FIG. It can be equivalent to a configuration in which 1a and 1b are connected in series.

  As described above, when one of the conductor foils 4 and 5 is divided at one place in the winding direction and the insulating sheet 8 is interposed between the divided end portions 4b and 5b, Although a configuration in which two capacitor elements 1a and 1b are connected in series is possible, as shown in the equivalent circuit of FIG. 6, one of the conductor foils 4, 5, and 6 is divided at two points in the winding direction. If the insulating sheet 8 is wound between the respective divided end portions, the winding is equivalent to a configuration in which the three capacitor elements 1a, 1b, and 1c are connected by three-phase star connection.

  In the above embodiment, a part of the insulator sheet 8 is inserted between the divided end portions of one of the conductor foils 4 and 5, and the remaining part is wound together with the conductor foils 4 and 5, In addition to such a structure, as shown in the equivalent circuit of FIG. 7, the divided end portions of one of the conductor foils 4 and 5 are spaced apart, and the entire insulating sheet 8 is placed between the divided end portions. A structure in which the conductive foils 4 and 5 are wound in parallel is possible. By disposing the insulating sheet 8 in this manner, the entire insulating sheet 8 is interposed between the separated end portions, so that the capacitor element 1 is divided into a plurality of capacitor elements 1a and 1b. In addition, since the conductive foils 4 and 5 and the insulating sheet 8 can be separated and wound, the winding operation becomes easy. Also in this case, since the winding side portion 8a of the insulating sheet 8 is interposed between the winding side portions 4a and 5a of the conductor foils 4 and 5 on one side in the winding direction, the insulating sheet 8 However, it is necessary that the conductor foils 4 and 5 have a winding length of one turn or more.

  In this case, as shown in the equivalent circuit of FIG. 8, the other conductor foils 2, 3 are divided in the winding direction at the same dividing position as one of the conductor foils 4, 5, and between the divided ends. A structure in which the conductive foil is removed is also possible. When the capacitor element 1 is manufactured by removing the conductive foil between the divided end portions in this way, both the one conductive foil 4 and 5 and the other conductive foil 2 and 3 are simultaneously cut. Therefore, the dividing operation can be simplified and the cost can be easily reduced.

  In the above embodiment, the case where only one of the conductor foils 4 and 5 is divided in the winding direction has been described, but both the one conductor foils 4 and 5 and the other conductor foils 2 and 3 are separated. It is also possible to divide and interpose the insulator sheet 8 between the respective divided ends. For example, as shown in the equivalent circuit of FIG. 9, one conductor foil 4, 5 is divided at two places with respect to the winding direction, and the other conductor foil 2, 3 is placed at one place with respect to the winding direction. Divide by. Thus, by dividing both the one conductor foil 4, 5 and the other conductor foil 2, 3 and interposing the insulator sheet 8 between the respective divided end portions, one capacitor element 1 can be used. The number of series stages can be further increased to be equivalent to a configuration in which four capacitor elements 1a to 1d are connected in series.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

DESCRIPTION OF SYMBOLS 1 Capacitor element 2 The other conductor foil 4,5 One conductor foil 7 Dielectric sheet 8 Insulator sheet

Claims (4)

Two conductor foils are used as a pair of electrodes, and a predetermined number of turns are wound in a state in which the conductor foil is insulated by a dielectric sheet, and one of the two conductor foils is wound on one of the conductor foils. The winding side portion protrudes from one side of the winding direction from the dielectric sheet and is drawn out as one electrode, and the winding side portion of the other conductor foil is drawn to the other side in the winding direction. A capacitor device having a capacitor element protruding from the body sheet and drawn out as the other electrode,
An insulator sheet that divides at least one of the two conductor foils with respect to the winding direction, and divides the capacitor element into a plurality of capacitance units internally between the divided ends. A capacitor characterized in that it is wound together with the conductor foil, and a winding side portion of the insulator sheet is interposed between winding side portions of the conductor foil on one side in the winding direction. apparatus.   2. The insulator sheet according to claim 1, wherein the insulating sheet is provided with separated end portions of the one conductor foil, and the entire insulator sheet is juxtaposed with the one conductor foil between the divided end portions. Capacitor device.   3. The capacitor device according to claim 2, wherein the other conductor foil is divided in the winding direction at the same dividing position as the one conductor foil, and the conductor foil between the divided end portions is removed.   The capacitor device according to claim 1, wherein the capacitor element is accommodated in a case and immersed in an insulating medium.

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