CN109727776B - Capacitor shell - Google Patents
Capacitor shell Download PDFInfo
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- CN109727776B CN109727776B CN201811208445.3A CN201811208445A CN109727776B CN 109727776 B CN109727776 B CN 109727776B CN 201811208445 A CN201811208445 A CN 201811208445A CN 109727776 B CN109727776 B CN 109727776B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 288
- 230000002093 peripheral effect Effects 0.000 claims abstract description 49
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- 238000003825 pressing Methods 0.000 description 8
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- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
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- 241000217377 Amblema plicata Species 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
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- 230000005489 elastic deformation Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
By using the capacitor case according to the present invention, not only can a capacitor assembly having high mechanical strength and good vibration resistance be obtained, but also appearance inspection of the capacitor assembly and printing of the surface of the capacitor assembly can be performed in an inconvenient manner. The capacitor case 1 of the present invention is a bottomed cylindrical capacitor case 1 for housing an aluminum electrolytic capacitor element, and is characterized by comprising: a cylindrical body portion 10 having an opening portion formed at one side; and a bottom part 20 connected to the cylindrical body part 10, wherein the outer peripheral wall 12 of the cylindrical body part 10 is substantially smooth, and at least three convex portions 30 extending from the bottom part 20 to the opening 11 side are provided on the inner peripheral wall 13 of the cylindrical body part 10.
Description
Technical Field
The invention relates to a capacitor shell.
Background
Conventionally, printed boards, circuit modules, and the like (hereinafter collectively referred to as "circuit modules") on which electronic components such as capacitors are mounted have been widely mounted on transportation machines and electronic devices such as vehicles, aircrafts, and ships.
In recent years, the installation places of circuit modules have been diversified. For example, with the development Of sensor networking and IoT (Internet Of Things), circuit modules for specifically sharing these functions are increasingly required to be disposed in increasingly severe environments. For example, circuit modules have been started to be disposed in the vicinity of an engine room of a four-wheeled automobile (so-called ecu (electronic Control unit)).
Therefore, electronic components such as capacitors are required to be able to withstand more severe environmental conditions (vibration and the like) than ever before. For example, it is necessary to provide a capacitor having high mechanical strength and good vibration resistance.
In order to meet such a demand, a capacitor case has been proposed (for example, see patent document 1) which can house a capacitor element and fix the capacitor element therein.
Fig. 8 is a diagram illustrating a conventional capacitor case 900. Fig. 8(a) is a perspective view of the capacitor case 900. Fig. 8(b) is a plan view of the capacitor case 900. Fig. 8(c) is a view of the capacitor case 900 cut along the line a-a in fig. 8(b) and viewed along the arrow a-a. Fig. 8(d) is an oblique view of capacitor assembly 509 assembled using capacitor housing 900.
As shown in fig. 8 a to 8 d, a conventional capacitor case 900 is a bottomed cylindrical case 900 for housing a capacitor element 200 (for example, an aluminum electrolytic capacitor element 200a), and includes: a cylindrical body portion 910 having an opening portion 911 formed at one side; and a bottom portion 920 connected to the other side of the cylindrical trunk portion 910. A convex portion 930 (i.e., a Bead) extending from the bottom portion 920 toward the opening portion 911 is formed on the inner peripheral wall 913 of the cylindrical body portion 910. A recess 940 having a shape corresponding to the projection 930 (bead) is formed in the outer peripheral wall 912 of the annular body 910 (see patent documents 1 and 2).
In the conventional capacitor case 900, since the convex portions 930 (solder balls) are formed on the inner peripheral wall 913 of the cylindrical body portion 910, when the capacitor element 200 is inserted into the capacitor case 900, the capacitor element 200 is fitted into the convex portions 930 and fixed in the capacitor case 900. Thus, by using the conventional capacitor case 900, the capacitor assembly 509 having high mechanical strength and good vibration resistance can be obtained (see fig. 8 (d)).
[ Prior Art document ]
[ patent document 1 ] appearance registration No. 1558404 publication
[ patent document 2 ] registration of appearance No. 1558405
However, since the concave portion 940 is formed in the peripheral wall 912 of the conventional capacitor case 900, there is a problem that the difficulty of appearance detection is high when the capacitor assembly 509 assembled by using the capacitor case 900 is subjected to appearance detection for the following reason.
According to a typical manufacturing process, after capacitor element 200 is inserted into capacitor case 900 to obtain capacitor assembly 509, a process of wrapping an outer end surface of capacitor assembly 509 with a protective tube such as a heat shrinkable tube is generally performed. Since the recessed portion 940 is formed in the outer peripheral wall 912 of the conventional capacitor case 900, a recessed portion (not shown) following the shape of the recessed portion 940 appears on the surface of the capacitor assembly 509' (not shown) covered with the protective tube.
Therefore, when the appearance of the capacitor assembly 509' (not shown) is detected to be dented, it is impossible to directly determine whether the dent is formed following the shape of the concave portion 940 (as a good product) or deformed by an external force (as a defective product). As described above, the need to further discriminate the detected dent requires additional special steps for discriminating the specific state of the dent.
As described above, according to the conventional capacitor case 900, since the concave portion 940 is formed in the peripheral wall 912, there is a problem that the difficulty of appearance detection is increased.
Further, although a plurality of pieces of information (such as the type, capacitance, and polarity of the capacitor) on the surface of the capacitor assembly 509/509' are usually printed, the outer peripheral wall 912 of the conventional capacitor case 900 has a recess 940 formed therein, and therefore, there is a problem that it is difficult to perform the printing at a portion corresponding to the recess 940.
In view of the above problems, it is an object of the present invention to provide a capacitor case that can obtain a capacitor assembly having high mechanical strength and good vibration resistance, and can detect appearance of the capacitor assembly and print the surface of the capacitor assembly in an inconvenient manner.
Disclosure of Invention
The present invention provides a capacitor case having a bottomed cylindrical shape for housing an aluminum electrolytic capacitor element, comprising: a cylindrical body part provided with an opening part on one side; and a bottom portion connected to the cylindrical body portion, wherein an outer peripheral wall of the cylindrical body portion is substantially smooth, and at least three convex portions extending from the bottom portion toward the opening portion side are provided on the inner peripheral wall of the cylindrical body portion.
In the capacitor case of the present invention, it is desirable that: wherein, when the cut surface is viewed along a central axis in a radial direction of the cylindrical trunk portion while the cut surface is cut at a portion facing the cylindrical trunk portion including the raised portions in parallel with the bottom portion, the three or more raised portions are arranged at equal angular intervals from each other around the central axis.
In the capacitor case of the present invention, it is desirable that: wherein the raised strip portion extends toward the opening portion side with an inner bottom surface of the bottom portion as a starting end, and terminates at a predetermined position between the inner bottom surface and the opening portion.
In the capacitor case of the present invention, it is desirable that: wherein, when the cut surface is viewed along the central axis in the radial direction of the cylindrical trunk portion while the portion including the convex portion in the cylindrical trunk portion is cut so as to face the bottom portion in parallel, the diameter of the inner circumference connecting the top portions of the three or more convex portions is smaller than the diameter of the outer circumference of the aluminum electrolytic capacitor element housed in the capacitor case.
In the capacitor case of the present invention, it is desirable that: wherein, when the cut is made at a portion parallel to the bottom portion facing the cylindrical trunk portion including the convex portion, and the cut surface is viewed along a central axis in a radial direction of the cylindrical trunk portion, the convex portion is formed in a semi-cylindrical shape having an arc outwardly expanding toward the central axis.
In the capacitor case of the present invention, it is desirable that: wherein, when the cut is made in a manner that the part of the cylindrical trunk portion including the convex portions is parallel to the bottom portion, and the cut surface is viewed along the central axis in the radial direction of the cylindrical trunk portion, the shape of the top portions of the convex portions is: the aluminum electrolytic capacitor element is housed in the capacitor case and has a shape in concentric relation with an outer peripheral circle of the aluminum electrolytic capacitor element.
In the capacitor case of the present invention, it is desirable that: wherein, when the cylindrical body portion is cut with a surface including a central axis in a radial direction of the cylindrical body portion and a top portion of the convex portion facing the cylindrical body portion, the convex portion includes: a linear portion extending from an inner bottom surface of the bottom portion to a predetermined position between the inner bottom surface and the opening portion, and being parallel to the inner peripheral wall or the outer peripheral wall of the cylindrical body portion; and a tapered portion that is continuous with the linear portion and that gradually inclines outward in the radial direction of the cylindrical barrel portion as the tapered portion approaches the opening portion side.
In the capacitor case of the present invention, it is desirable that: the capacitor case is formed by press-molding using a Punch (Punch) having a concave portion on the outer periphery near the distal end portion, and the shape of the ridge portion follows the shape of the concave portion of the Punch.
Effects of the invention
In the capacitor case according to the present invention, the cylindrical body portion has at least three ridges extending from the bottom portion toward the opening portion on the inner peripheral wall thereof. Therefore, when the capacitor element (for example, an aluminum electrolytic capacitor element, hereinafter simply referred to as "capacitor element") is inserted into the capacitor case, the three or more raised strips are fitted to the outer periphery of the capacitor element. Thus, the capacitor element is firmly fixed inside the capacitor case. Therefore, by using the capacitor case of the present invention, a capacitor assembly having high mechanical strength and good vibration resistance can be obtained.
Further, since the outer peripheral wall of the cylindrical body portion is substantially smooth, the surface of the capacitor assembly assembled using the capacitor case of the present invention does not have a large recess. Thus, even when the capacitor assembly is deformed by an external force and then dents are formed, such dents can be easily detected by the appearance detection. Further, printing can be easily performed with a plurality of information on the surface of the capacitor assembly.
As described above, by using the capacitor case according to the present invention, it is possible to obtain a capacitor assembly having high mechanical strength and excellent vibration resistance, and it is also possible to perform appearance inspection of the capacitor assembly and printing of the surface of the capacitor assembly in an extremely convenient manner.
Drawings
Fig. 1 is a diagram illustrating a capacitor case 1 according to an embodiment.
Fig. 2 is a diagram illustrating the capacitor case 1 according to the first embodiment.
Fig. 3 is a diagram illustrating the capacitor case 1 according to the first embodiment.
Fig. 4 is a diagram for explaining a capacitor assembly 500 assembled by using the capacitor case 1 according to the first embodiment.
Fig. 5 is a diagram for explaining the capacitor case 2 according to the second embodiment.
Fig. 6 is a flowchart for explaining a method of manufacturing a capacitor case according to the third embodiment.
Fig. 7 is a diagram for explaining the capacitor cases 3 to 5 according to the first to third modifications.
Fig. 8 is a diagram illustrating a conventional capacitor case 900.
Detailed Description
Hereinafter, the capacitor case of the present invention will be described with reference to the forms shown in the respective drawings. In addition, each drawing is only a schematic diagram, and does not strictly reflect actual dimensions.
[ first embodiment ] to provide a toner
1. Structure of capacitor case 1 according to the first embodiment
(1) Basic constitution
The capacitor case 1 is a bottomed cylindrical capacitor case for housing an aluminum electrolytic capacitor element.
Fig. 1 is a diagram illustrating a capacitor case 1 according to an embodiment. Fig. 1(a) is a perspective view of capacitor case 1 viewed from obliquely above with opening 11 positioned above the drawing. Fig. 1 b is a sectional view of the capacitor case 1 when the capacitor case 1 is cut along a plane PL1 (see fig. 1 a) including the central axis AX1 in the radial direction (r direction) of the cylindrical barrel portion 10 and the top portions 35 of the convex portions 30, and the cut plane is viewed in a direction perpendicular to the plane PL 1.
As shown in fig. 1(a) and 1(b), the capacitor case 1 includes: a cylindrical body portion 10 having an opening 11 formed at one side (upper side in the figure); and a bottom portion 20 connected to the other side (lower side in the figure) of the cylindrical trunk portion 10.
The outer peripheral wall 12 of the cylindrical trunk portion 10 is substantially smooth.
At least three raised portions 30 extending from the bottom portion 20 toward the opening 11 are provided on the inner peripheral wall 13 of the tubular body portion 10.
In the example of fig. 1(a) to 1(b), six raised portions 30 are provided.
The "convex strip" herein refers to a portion that protrudes from another portion (the inner peripheral wall 13 of the cylindrical barrel 10) toward the central axis AX1, and the protruding portion extends in the longitudinal direction (the direction parallel to the central axis AX 1).
The cylindrical trunk portion 10 and the bottom portion 20 may be integrally formed of the same material (e.g., a material containing aluminum).
(2) With respect to the longitudinal direction of the raised strip 30
The raised strip portion 30 in the first embodiment extends toward the opening 11 with the inner bottom surface 21 of the bottom portion 20 as a starting end, and terminates at a predetermined position (a position indicated by a terminal end 34 in fig. 1 b) between the inner bottom surface 21 and the opening 11. The inner peripheral wall 13 of the tubular body 10 has no ridge 30 formed near the opening 11.
The cylindrical body part 10 has a dimension L in the longitudinal direction from the inner bottom surface 21 of the bottom part 20 to the end part on the opening part 11 sideC. On the other hand, the raised strip portion 30 has a dimension L in the longitudinal direction from the bottom portion 20 to the opening portion 11 sideL(see FIG. 1 (b)).
Generally, L will be satisfiedLLTLCThe relationship (2) of (c). If L is satisfiedL＜(LCThe relationship of/2) is more desirable.
The ridge portion 30 has a linear portion 31 and a tapered portion 32.
The linear portion 31 extends from the inner bottom surface 21 of the bottom portion 20 toward the terminal end 34 to a predetermined position between the inner bottom surface 21 and the opening 11, and is parallel to the inner peripheral wall 13 or the outer peripheral wall 12 of the cylindrical barrel portion 10. Here, the symbol L will be usedSThe length in the direction parallel to the inner peripheral wall 13 of the linear portion 31 is shown.
Will generally satisfy LT＜LSThe relationship (2) of (c). If L is satisfiedT＜(LSThe relationship of/4) is more desirable. Due to the length L of the straight line part 31SIf the length of the fitting portion is relatively long, the length of the fitting portion to the capacitor element is relatively long, and thus the capacitor element can be fixed more firmly.
(3) Cross section of the raised strip 30
Fig. 2 is a diagram illustrating the capacitor case 1 according to the first embodiment. Fig. 2 a is a cross-sectional view of a portion of the cylindrical trunk 10 including the convex portions 30, which is parallel to the bottom portion 20 (a portion indicated by an arrow along a-a in fig. 1 b), and viewed along the central axis AX1 in the radial direction (r direction) of the cylindrical trunk 10. Fig. 2(b) is a front view of the capacitor case 1 according to the first embodiment.
As shown in fig. 2(a), the raised strips 30 are arranged at equal angular intervals from each other about the central axis AX 1. In the example of the capacitor case 1 shown in fig. 2(a), the ridges 30 are provided at six locations, and one ridge 30 and another adjacent ridge 30 are arranged at intervals of 60 ° (θ 1 to θ 6) from each other around the central axis AX 1.
In the example of the capacitor case 1 shown in fig. 2(a), the ridge portion 30 has a semi-cylindrical shape in which an arc is flared toward the center axis AX 1.
The portion of the arc closest to the central axis AX1 is referred to as the "top portion" of the raised strip (indicated by the top portion 35 in fig. 2 a).
In the capacitor case 1 according to the first embodiment, each of the ridge portions 30 is formed as: the top portions 35 of the three or more raised strip portions 30 are arranged on the circumference of an imaginary circle centered on the central axis AX 1. These top portions 35 arranged at three or more positions on the circumference are fitted to the outer circumferential surface of the cylindrical capacitor element to fix the capacitor element.
(4) Appearance of the capacitor case 1
As shown in fig. 2(b), the outer peripheral wall 12 of the cylindrical body portion 10 is substantially smooth. In other words, the outer peripheral wall 12 of the cylindrical barrel portion 10 is not formed with a substantial step or/and substantial irregularities.
(5) Dimensional relationship between the ridge portion 30 and the aluminum electrolytic capacitor element 200a
Fig. 3 is a diagram illustrating the capacitor case 1 according to the first embodiment. Fig. 3 shows an aluminum electrolytic capacitor element 200a inserted into the capacitor case 1. In the figure, reference numeral 300 denotes a sealing member, which constitutes a part of a capacitor assembly 500 described later.
When the cylindrical body portion 10 is cut at a portion parallel to the bottom portion 20 and facing the portion including the convex portion 30, and the cut portion is viewed along the central axis AX1 in the radial direction (r direction) of the cylindrical body portion 10, the capacitor case 1 is configured such that: the diameter θ a of the inner circumference (virtual inner circumference) of the top portion 35 of each of the three or more protruding strip portions 30 connected thereto is smaller than the diameter θ B of the outer circumference of the aluminum electrolytic capacitor element 200a housed in the capacitor case 1.
2. Capacitor assembly 500 using capacitor case 1 according to first embodiment
Fig. 4 is a diagram for explaining a capacitor assembly 500 assembled by using the capacitor case 1 according to the first embodiment. Fig. 4(a) is an oblique view of the capacitor assembly 500 viewed from the bottom 20 side. Fig. 4(b) is a sectional view of the capacitor assembly 500 cut on a plane including the central axis AX1 in the radial direction of the cylindrical barrel 10 and the convex portion 30.
As shown in fig. 4(a) and 4(b), the capacitor assembly 500 may be formed by: capacitor case 1, capacitor element 200, and sealing member 300 according to the first embodiment.
In the first embodiment, the aluminum electrolytic capacitor element 200a constitutes the capacitor element 200. The aluminum electrolytic capacitor element 200a is, for example, a general capacitor element having: one electrode foil connected to one terminal 202 and the other electrode foil connected to the other terminal 202 are wound so that the one electrode foil and the other electrode foil are inserted into separators one by one (not shown).
Sealing body 300 is press-fitted into the vicinity of opening 11 of capacitor case 1, and seals capacitor element 200 fitted into capacitor case 1, and assists and supports the root of terminal 202 of capacitor element 200.
As shown in fig. 3, the capacitor element 200 is inserted into the capacitor case 1 from the opening 11 to the vicinity of the bottom portion 20, and as shown in fig. 4, the capacitor element 200 is fitted to the ridge portion 30, whereby the capacitor element 200 can be fixed to the capacitor case 1. Thus, a basic capacitor assembly 500 can be obtained. The sealing member 300 may be press-fitted near the opening 11.
3. Effects of the capacitor case 1 according to the first embodiment
(1) A capacitor case 1 according to an embodiment is a bottomed cylindrical capacitor case for housing an aluminum electrolytic capacitor element 200a, and includes: a cylindrical body portion 10 having an opening 11 formed at one side; and a bottom portion 20 connected to the other side of the cylindrical trunk portion 10. The outer peripheral wall 12 of the cylindrical body portion 10 is substantially smooth, and at least three raised portions 30 extending from the bottom portion 20 toward the opening 11 side are provided on the inner peripheral wall 13 of the cylindrical body portion 10.
At least three raised portions 30 extending from the bottom portion 20 toward the opening 11 are provided on the inner peripheral wall 13 of the tubular body portion 10. Therefore, when the capacitor element 200 is inserted into the capacitor case 1, the three or more raised portions 30 are fitted to the outer periphery of the capacitor element 200. Thus, the capacitor element 200 is firmly fixed inside the capacitor case 1. Therefore, by using the capacitor case 1 according to the first embodiment, the capacitor assembly 500 having high mechanical strength and good vibration resistance can be obtained.
Further, since the outer peripheral wall 12 of the cylindrical barrel portion 10 is substantially smooth, the surface of the capacitor assembly 500 assembled by using the capacitor case 1 according to the first embodiment does not have a large recess. Thus, even when the capacitor assembly 500 is deformed by an external force and then dented, such dents can be easily detected by the appearance inspection.
In addition, printing can be easily performed with a plurality of information on the surface of the capacitor assembly. And not only can directly carry out printing to capacitor case 1, can also use the protection tube to carry out printing again after wrapping up capacitor case 1.
As described above, by using the capacitor case 1 according to the first embodiment, not only the capacitor assembly 500 having high mechanical strength and excellent vibration resistance can be obtained, but also appearance inspection of the capacitor assembly and printing of the surface of the capacitor assembly can be performed easily.
(2) In the capacitor case 1 according to the first embodiment, when the cylindrical barrel portion 10 is cut at a portion parallel to the bottom portion 20 and including the ridges 30 and the cut surface is viewed along the central axis AX1 in the radial direction (r direction) of the cylindrical barrel portion 10, the three or more ridges 30 are arranged at equal angular intervals from each other around the central axis AX 1.
Since the three or more ridges 30 are arranged at equal angular intervals from each other, when the capacitor element 200 is inserted into the capacitor case 1 and the ridges 30 are fitted to the outer periphery of the capacitor element 200, the stress applied to the capacitor element 200 by the capacitor case 1 can be evenly distributed. Moreover, no looseness occurs. Thus, the capacitor assembly 500 having further excellent vibration resistance can be obtained.
(3) In the capacitor case 1 according to the first embodiment, the ridge portion 30 extends toward the opening 11 from the inner bottom surface 21 of the bottom portion 20, and terminates at a predetermined position (shown as a terminal 34 in fig. 1 b) between the inner bottom surface 21 and the opening 11.
That is, since the ridge 30 is not formed near the opening 11, the inner diameter (not shown) near the opening 11 is larger than the inner diameter Φ a of the bottom portion 20 on which the ridge 30 is formed. Thus, it becomes a capacitor case 1 which facilitates insertion of the capacitor element 200.
(4) In the capacitor case 1 according to the first embodiment, when the portion of the cylindrical barrel portion 10 including the convex portions 30 is cut parallel to the bottom portion 20 and the cut surface is viewed along the central axis AX1 in the radial direction (r direction) of the cylindrical barrel portion 10, the diameter θ a of the inner circumference of the top portion 35 of each of the three or more convex portions 30 is smaller than the diameter θ B of the outer circumference of the aluminum electrolytic capacitor element 200a housed in the capacitor case 1.
With this configuration, the capacitor case 1 centered on the ridge 30 and the vicinity of the outer periphery of the capacitor element 200 are fitted to each other by elastic deformation. Thus, the capacitor element 200 is more firmly fixed to the capacitor case 1, and the capacitor assembly 500 having more excellent vibration resistance is obtained.
(5) In the capacitor case 1 according to the first embodiment, the part of the cylindrical barrel portion 10 including the projected strip 30 is cut in parallel with the bottom portion 20, and when the cut surface is viewed along the central axis AX1 in the radial direction (r direction) of the cylindrical barrel portion 10, the projected strip 30 is formed in a semi-cylindrical shape having an arc outwardly extending toward the central axis AX 1.
Even when there are manufacturing errors, more or less, in the outer diameter dimension of the capacitor element 200 and the inner diameter dimension of the capacitor case 1, since the ridge portion 30 of the first embodiment is formed in a semi-cylindrical shape in which the arc is outwardly expanded toward the central axis AX1, the contact area between the ridge portion 30 and the outer periphery of the capacitor element 200 can be appropriately changed while the ridge portion 30 and the outer periphery of the capacitor element 200 are fitted to each other. Thus, the capacitor element 200 is fitted into the capacitor case 1 having high flexibility.
(6) In the capacitor case 1 according to the first embodiment, when the cylindrical body portion 10 is cut with a surface including the central axis AX1 in the radial direction (r direction) of the cylindrical body portion 10 and the top portions 35 of the ridge portions 30, the ridge portions 30 include: a linear portion 31 extending from the inner bottom surface 21 of the bottom portion 20 to a predetermined position between the inner bottom surface 21 and the opening 11, and being parallel to the inner peripheral wall 13 or the outer peripheral wall 12 of the cylindrical body portion 10; and a tapered portion 32 which is continuous with the linear portion 31 and gradually inclines outward in the radial direction (r direction) of the cylindrical body portion 10 as it approaches the opening portion 11 side.
With this structure, when the capacitor element 200 is inserted into the capacitor case 1, the tapered portion 32 can guide the capacitor element 200 to the inside of the capacitor case 1. That is, the capacitor case according to the first embodiment is a capacitor case that facilitates insertion of the capacitor element 200. Further, the linear portions 31 of the ridges 30 also enable the ridges 30 to be more firmly fitted to the outer periphery of the capacitor element 200.
[ second embodiment ] to provide a medicine for treating diabetes
Next, the capacitor case 2 according to the second embodiment will be described with reference to fig. 5. The same constituent elements as those of the first embodiment will not be described in the second embodiment.
Fig. 5 is a diagram for explaining the capacitor case 2 according to the second embodiment. Wherein FIG. 5(a) is a view corresponding to the capacitor case 1 according to the first embodiment of FIG. 2(a), that is, the cylindrical trunk 10 is cut in a portion parallel to the bottom portion 20 and including the convex portions 30 (i.e., and a sectional view of the cut surface is viewed along a central axis AX1 in the radial direction (r direction) of the cylindrical barrel portion 10, in the figure, C1 is a virtual circle connected to the top portions 35a of the convex portions 30a, C2 is a virtual circle showing the outer periphery of an aluminum electrolytic capacitor element (not shown) housed in the capacitor case 2, the circumference of C2 is located slightly outside the circumference of C1, and fig. 5(b) is a sectional view of the capacitor case 2 viewed in a direction perpendicular to the plane after the capacitor case 2 is cut on the plane including the central axis AX1 in the radial direction (r direction) of the cylindrical barrel portion 10 and the top portions 35a of the convex portions 30 a.
The capacitor case 2 according to the second embodiment basically has the same configuration as the capacitor case 1 according to the first embodiment, but is different from the capacitor case 1 according to the first embodiment in the structure of the ridge portion.
That is, in the capacitor case 2 according to the second embodiment, as shown in fig. 5(a), when the portion of the cylindrical body portion 10 including the convex portions 30a is cut in parallel with the bottom portion 20 and the cut surface is viewed along the central axis in the radial direction of the cylindrical body portion 10, the top portions 35a of the convex portions 30a have the following shapes: the aluminum electrolytic capacitor element (not shown) housed in the capacitor case 2 has a shape concentric with the outer circumference C2.
In other words, the top portions 35a of the raised strip portions 30a are shaped to follow the form of the outer peripheral surface of the capacitor element for insertion.
According to the capacitor case 2 of the second embodiment, the top portions 35a of the ridges 30a have the following shapes: the aluminum electrolytic capacitor element housed in the capacitor case 2 has a shape in concentric relation with an outer peripheral circle C2. Therefore, the contact area between the ridge portion 30a and the outer periphery of the capacitor element (here, the aluminum electrolytic capacitor element in the drawing) can be secured by a fixed amount. Thus, the capacitor element can be fixed to the capacitor case more firmly.
The capacitor case 2 according to the second embodiment has the same configuration as the capacitor case 1 according to the first embodiment except for the structure of the ridge portion, and therefore has the same effects as those of the capacitor case 1 according to the first embodiment.
[ third embodiment ]
Next, as a third embodiment, a method for manufacturing the capacitor case 1 according to the first embodiment will be described.
1. Method for manufacturing capacitor case 1
Fig. 6 is a flowchart for explaining a method of manufacturing a capacitor case according to the third embodiment.
As shown in fig. 6, the method for manufacturing a capacitor case according to the third embodiment is a method for manufacturing a capacitor case according to the first embodiment, and includes the steps of: a cold charge (Slug) material placing step S20; a press (Impact press) step S30; a Rolling (Rolling) cold charge separation step S40; and a Trimming (Trimming) process S50. Before the cold charge placing step S20, the mold preparation step S10 may be performed.
The Die preparation step S10 is a step of preparing a Die including a punch and a Die set (Die) having a supply recess 122 in which a cold material can be placed. The die has a recess near the tip of the punch, and the recess has a shape (not shown) corresponding to the shape of the ridge 30 of the capacitor case 1 after manufacture.
The cold charge placing step S20 is a step (not shown) for placing a cold charge in the supply concave portion of the die set.
The cold charge is a metal-containing material. For example, a metal material such as aluminum can be used.
The press step S30 is a step (not shown) of obtaining a rolled cold material after forming the cold material by impacting the cold material placed in the feed recess of the die set with the punch and rolling the cold material so as to conform to the shape of the punch.
That is, when the cold material is impacted, the impacted cold material is rolled along the shape of the feeding concave portion of the die set, and is rolled while following the shape of the punch, and finally formed into a rolled cold material (not shown).
The cold rolled material separating step S40 is a step (not shown) of separating the cold rolled material formed in the pressing step S30 from the punch 10.
The specific separation method may be any method, and for example, the end of the rolled cold material may be pulled by a Stripper (Stripper) to separate the rolled cold material from the punch 10 (not shown).
The dressing step S50 is a step (not shown) of removing the opening portion side of the rolled cold billet and forming the rolled cold billet into a predetermined length. For example, the rolled cold rolled material may be formed into a predetermined length by cutting or chipping at a predetermined cutting portion (not shown).
As described above, the capacitor case 1 according to the first embodiment can be obtained by performing the cold charge holding step S20 to the trimming step S50 at a time.
In the capacitor case 1 according to the first embodiment, since the capacitor case 1 is formed by press forming (the press step S30) using a punch having a concave portion on the outer periphery near the tip, the shape of the ridge 30 follows the shape of the concave portion of the punch.
2. Effects of the method for manufacturing the capacitor case 1
Conventionally, a general housing is generally manufactured by inserting a single metal plate (Blank) between a lower die and an upper die and then performing a stepwise press, that is, a so-called "deep drawing" (not shown). However, since the deep drawing is performed in stages, many dies need to be prepared, and the number of steps is relatively large. In addition, since it is necessary to secure a sufficient time for pressing so as not to crack the metal plate, the working time is also extended. For these reasons, there is a problem that the manufacturing cost is increased when the housing is manufactured by deep drawing.
Further, there is a problem that it is relatively difficult to align the lower die (die) and the upper die (punch) during deep drawing.
(1) In the method for manufacturing the capacitor case 1 according to the third embodiment, the punch used has a concave portion corresponding to the shape of the convex portion 30 in the vicinity of the tip end thereof, and includes: and a pressing step S30 in which the cold material placed in the feeding recess of the die set is impacted, and the cold material is rolled so as to conform to the shape of the punch, thereby forming the cold material into a rolled cold material.
There is basically only one type of lower die (die) and upper die (punch) that need to be prepared when performing the pressing step S30. In the pressing step S30, the cold material can be rolled by a single impact to obtain a rolled cold material. Therefore, according to the method of manufacturing the capacitor case 1 according to the third embodiment, the processing time can be significantly shortened as compared with the case of manufacturing by deep drawing, and the capacitor case 1 according to the first embodiment can be obtained by preparing a smaller number of dies.
In addition, according to the pressing step S30, since the position alignment between the lower die (die) and the upper die (punch) does not necessarily require an excessively high accuracy, the capacitor case 1 according to the first embodiment can be obtained more easily than the manufacturing by deep drawing.
(2) The thickness of the case obtained by deep drawing is thinner than other portions because the thickness of the edge portion of the bottom portion (the boundary between the cylindrical body portion and the bottom portion, in other words, the corner portion of the bottom portion of the capacitor case) is extended by the drawing.
In contrast, according to the method of manufacturing the capacitor case 1 according to the third embodiment, the thickness of the bottom portion formed in the pressing step S30 is the same as or thicker than the thickness of the other portions.
Therefore, it is assumed that even when stress is concentrated at the edge portion of the bottom portion 20, the capacitor case 1 in which the edge portion of the bottom portion 20 is not easily cracked can be obtained.
(3) In addition, the conventional capacitor case 900 (see fig. 8) may be formed by deep drawing. That is, the convex portions 930 (i.e., the beads) are formed on the inner peripheral wall 913 of the cylindrical body portion 910, and the concave portions 940 conforming to the shape of the convex portions 930 are also formed on the outer peripheral wall 912. In this case, the thickness of the cylindrical body portion 10 in the vicinity of the convex portion 930 and the concave portion 940 is formed by deep drawing, and therefore, the thickness becomes thinner than other portions.
In contrast, according to the manufacturing method in the third embodiment, since the capacitor case 1 is formed by the pressing step S30, the thickness between the top portions 35 of the ridges 30 and the outer peripheral wall 12 of the cylindrical body portion 10 is larger than the thickness of the other portions (the portions of the cylindrical body portion 10 where the ridges 30 are not formed).
In this way, when the capacitor element 200 is fitted into the interior, even if stress is applied to the vicinity of the ridge portion 30, the vicinity of the ridge portion 30 has a relatively large thickness as described above, and the rigidity is relatively high, so that the capacitor element 200 can be firmly fitted. Therefore, a capacitor assembly having high mechanical strength and good vibration resistance can be obtained.
In addition, although the method for manufacturing the capacitor case 1 according to the first embodiment is described as the third embodiment, the third embodiment is not limited thereto. For example, the same can be applied to embodiment three also when manufacturing the capacitor case 2 according to embodiment two.
The present invention has been described above with reference to the above embodiments, but the present invention is not limited to the above embodiments. The present invention can be variously modified within a range not departing from the gist of the invention, and for example, the following modifications can be made.
(1) In the capacitor cases 1 to 2 according to the first to third embodiments, the ratio of the length LS of the linear portion 31 of the ridge portion 30 to the length LT of the tapered portion 32 is, for example, approximately 9 in fig. 1 (b): 1. the invention is not limited thereto. This ratio may be appropriately changed (modifications one to three).
Fig. 7 is a diagram for explaining the capacitor cases 3 to 5 according to the first to third modifications. Fig. 7(a) is a sectional view of the capacitor case 3 in a case where the capacitor case 3 according to the first modification is cut on a plane including the central axis AX1 in the radial direction of the cylindrical barrel portion 10 and the top portions 35b of the convex portions 30, and the cut plane is viewed in a direction perpendicular to the plane. Fig. 7(b) is an enlarged view of the dotted line portion of fig. 7 (a). Fig. 7(c) is a sectional view of a main part of a capacitor case 4 according to a second modification. Fig. 7(d) is a sectional view of a main part of a capacitor case 5 according to a third modification.
As shown in fig. 7(a) and 7(b), the capacitor case 3 according to the first modification has a length L of the tapered portion 32TLength L relative to straight line part 31SIs larger than the ratio shown in fig. 1 (b).
As shown in fig. 7(c), the capacitor case 4 according to the second modification has a length L of the straight portion 31SInfinitely close to zero and the length L of its conical part 32TLength L relative to straight line part 31SThe ratio of (a) is set very large. With such a structure, the capacitor element 200 can be easily inserted into the capacitor case 4.
Modification example III relates toAs shown in FIG. 7(d), the length L of the tapered portion 32 of the capacitor case 5TInfinitely close to zero and the length L of its conical part 32TLength L relative to straight line part 31SThe ratio of (a) is set very small. With such a structure, the length of the tapered portion 32 for fitting with the capacitor element 200 can be secured to a large extent, and thus it can be firmly fixed in the capacitor case 4.
(2) In the capacitor cases 1 to 3 according to the first to third embodiments, the description has been given taking as an example that the shape of the cylindrical barrel portion (the shape cut by a plane parallel to the bottom portion) is substantially a perfect circle, but the present invention is not limited to this. For example, the cylindrical trunk may be an ellipse (not shown) or a polygon (not shown) such as a rectangle (including a square). These shapes can be appropriately changed as needed depending on the shape of the capacitor element housed inside.
(3) In the capacitor cases 1 to 2 according to the first to third embodiments, six convex portions are provided in the capacitor case 1 to 2 as an example in fig. 7, but the present invention is not limited to this. For example, three positions (not shown) may be provided. When the three convex portions 30 are provided, the capacitor element can be reliably fixed, although the design is simplified.
The capacitor case may be configured in accordance with a specification in which four, five, or eight ridges are provided (not shown). In this case, since the number of portions (portions where contact occurs) where the capacitor element needs to be fitted is increased, the capacitor element can be fixed more firmly.
Therefore, it is more preferable to provide six ridges. When six locations are provided, the number of fitting portions (the number of portions supporting the capacitor element) of the capacitor element becomes larger than that of three locations, so that stress can be dispersed, and a capacitor assembly having high mechanical strength and good vibration resistance can be obtained.
(4) In the capacitor case 1 according to the first embodiment, as shown in fig. 1 to 4, a half-cylindrical shape (forming a perfect circular arc) in which the convex portion 30 is outwardly expanded toward the center axis AX1 in an arc shape is exemplified. The invention is not limited thereto.
For example, the arc of the convex strip may be a shape forming an elliptical arc (not shown). The arc flare portion may be formed into an acute angle (i.e., a shape having a corner portion formed toward the central axis AX 1) (not shown).
In fig. 1 to 4, the shape of the ridge 30 is formed as follows: the ridge 30 is formed to protrude in an arc shape directly from the surface of the inner peripheral wall 13 of the tubular body portion 10. The invention is not limited thereto. For example, it may be formed as: the convex portion 30 is formed by forming a convex shape (rectangular portion) protruding upward from the surface of the inner peripheral wall 13 of the tubular body portion 10 and then forming an arc-shaped convex portion (not shown).
Description of the symbols
1. 2, 3, 4, 5, 900 … capacitor cases; 10. 910 … a tubular torso portion; 11. 911 … opening part; 12. 912 … outer peripheral wall; 13. 913 … inner circumferential wall; 20. 920 … bottom; 21 … inner bottom surface; 30. 30a, 30b, 930 … raised strip; 31 … straight line portion; a 32 … taper; 34 … terminal end; 35. 35a, 35b … top; 200 … capacitor elements; 200a … aluminum electrolytic capacitor element; 202 … terminals; 300 … sealing body; 500. 509, 509' … capacitor combination; 940 … (of the peripheral wall)
Claims (6)
1. A capacitor case having a bottomed cylindrical shape for housing an aluminum electrolytic capacitor element, comprising:
a cylindrical body part provided with an opening part on one side; and
a bottom portion connected to the cylindrical trunk portion,
wherein the outer peripheral wall of the cylindrical body is substantially smooth,
at least three raised portions extending from the bottom portion toward the opening portion are provided on the inner peripheral wall of the cylindrical body portion,
wherein, when the cylindrical body portion is cut so as to face a central axis in a radial direction of the cylindrical body portion and a top portion of the convex portion,
the raised strip portion has:
a linear portion extending from an inner bottom surface of the bottom portion to a predetermined position between the inner bottom surface and the opening portion, and being parallel to the inner peripheral wall or the outer peripheral wall of the cylindrical body portion; and
a tapered portion which is continuous with the linear portion and gradually inclines outward in the radial direction of the cylindrical barrel portion as the tapered portion approaches the opening portion side,
the linear portion has a length L in a direction parallel to the inner peripheral wallS，
The length of the tapered part in the direction parallel to the inner peripheral wall is LT，
LT＜(LS/4)，
The capacitor case is manufactured by a press step of obtaining a rolled cold material after a cold material is formed by striking the cold material with a punch and rolling the cold material so as to conform to the shape of the punch, the punch having a concave portion in the vicinity of a tip end thereof, the concave portion having a shape corresponding to the convex portion,
the thickness between the top of the raised strip and the outer peripheral wall of the cylindrical trunk portion is greater than the thickness of a portion of the cylindrical trunk portion where the raised strip is not formed.
2. The capacitor case of claim 1, wherein:
wherein when the cut surface is viewed along the central axis in the radial direction of the cylindrical trunk portion while the cut surface is cut at a portion parallel to the bottom portion and facing the cylindrical trunk portion including the convex portion,
the three or more raised strips are arranged at equal angular intervals from each other around the central axis.
3. The capacitor case of claim 1 or 2, wherein:
wherein the raised strip portion extends toward the opening portion side with an inner bottom surface of the bottom portion as a starting end, and terminates at a predetermined position between the inner bottom surface and the opening portion.
4. The capacitor case of claim 1, wherein:
wherein when the cut surface is viewed along the central axis in the radial direction of the cylindrical trunk portion while the cut surface is cut at a portion parallel to the bottom portion and facing the cylindrical trunk portion including the convex portion,
the diameter of the inner circumference connecting the top portions of the three or more raised strips is smaller than the diameter of the outer circumference of the aluminum electrolytic capacitor element housed in the capacitor case.
5. The capacitor case of claim 1, wherein:
wherein when the cut surface is viewed along the central axis in the radial direction of the cylindrical trunk portion while the cut surface is cut at a portion parallel to the bottom portion and facing the cylindrical trunk portion including the convex portion,
the convex strip part is in a semi-cylindrical shape expanding outwards towards the central shaft in an arc shape.
6. The capacitor case of claim 1, wherein:
wherein when the cut surface is viewed along the central axis in the radial direction of the cylindrical trunk portion while the cut surface is cut at a portion parallel to the bottom portion and facing the cylindrical trunk portion including the convex portion,
the shape of the top of the raised strip portion is as follows: the aluminum electrolytic capacitor element is housed in the capacitor case and has a shape in concentric relation with an outer peripheral circle of the aluminum electrolytic capacitor element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017208684A JP2019083236A (en) | 2017-10-28 | 2017-10-28 | Capacitor outer case |
| JP2017-208684 | 2017-10-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109727776A CN109727776A (en) | 2019-05-07 |
| CN109727776B true CN109727776B (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811208445.3A Active CN109727776B (en) | 2017-10-28 | 2018-10-17 | Capacitor shell |
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| Country | Link |
|---|---|
| JP (1) | JP2019083236A (en) |
| CN (1) | CN109727776B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395374Y (en) * | 1999-11-05 | 2000-09-06 | 尤勇 | Super fine box type capacitor non-glued outer case |
| JP1558404S (en) * | 2015-12-21 | 2016-12-05 | ||
| CN205828159U (en) * | 2016-06-30 | 2016-12-21 | 佛山市正电电容器有限公司 | A kind of aluminium electrolutic capacitor |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS505848U (en) * | 1973-05-15 | 1975-01-22 | ||
| JPS6127231U (en) * | 1984-07-18 | 1986-02-18 | 日通工株式会社 | Case for electrolytic capacitors |
| JPH1022177A (en) * | 1996-07-05 | 1998-01-23 | Hitachi Aic Inc | Capacitor in case |
| JP4763110B2 (en) * | 1998-10-20 | 2011-08-31 | 日本ケミコン株式会社 | Capacitor |
| JP4946493B2 (en) * | 2007-02-19 | 2012-06-06 | パナソニック株式会社 | Film capacitor |
| CN202564062U (en) * | 2012-04-20 | 2012-11-28 | 宁波新容电器科技有限公司 | Capacitor assembly packaging outer shell |
| CN204230048U (en) * | 2014-10-31 | 2015-03-25 | 铜陵市胜美达电子制造有限公司 | The Novel capacitor outer casing that support force is strong |
| CN204303568U (en) * | 2014-11-19 | 2015-04-29 | 南通创佳机电有限公司 | Aluminium shell of capacitor |
| JP6845495B2 (en) * | 2016-04-19 | 2021-03-17 | ニチコン株式会社 | Electronic components |
-
2017
- 2017-10-28 JP JP2017208684A patent/JP2019083236A/en active Pending
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- 2018-10-17 CN CN201811208445.3A patent/CN109727776B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395374Y (en) * | 1999-11-05 | 2000-09-06 | 尤勇 | Super fine box type capacitor non-glued outer case |
| JP1558404S (en) * | 2015-12-21 | 2016-12-05 | ||
| CN205828159U (en) * | 2016-06-30 | 2016-12-21 | 佛山市正电电容器有限公司 | A kind of aluminium electrolutic capacitor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2019083236A (en) | 2019-05-30 |
| CN109727776A (en) | 2019-05-07 |
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