JPH0758661B2 - Composite capacitor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite capacitor, and more particularly to an insulating structure of a terminal assembly, which has a rated voltage of AC15.
The present invention relates to a composite capacitor for a microwave oven used in a voltage doubler rectifier circuit at 00 to 3000V.

2. Description of the Related Art In recent years, there is a strong demand for higher functionality, smaller size, and lighter weight of sets from the pursuit of high value added by set manufacturers in the electrical industry, and power supply circuit components such as device capacitors are being demanded. There are also strong demands for downsizing, weight reduction, and cost reduction.

The conventional composite capacitor generally has a wiring method and an appearance / shape as shown in FIG. Reference numeral 9 is a container for accommodating the capacitor body, and 4 is a plastic terminal insulating cup for insulating the terminal fitting 6. The configuration will be described below with reference to the terminal portion assembly structure diagram of FIG. 7 and the product sectional view of FIG.

In FIGS. 7 and 8, the metal lid 1 having the insulating oil impregnated hole 1a that is in contact with the open end of the container 9 that houses the capacitor body 7 is sealed with the container 9 by seaming.
A terminal insulating cup 4 made of plastic is inserted into a plurality of terminal rod fittings 6a which are attached by penetrating an insulating plate 2 made of a paper press board and penetrating a metal lid 1 via a packing rubber 3, and at the same time, a terminal rod fitting. 6 is fitted and integrated. The lead wire 5a of the discharge resistor 5 is welded to the lower ends of the terminal rod fittings 6a located on both outer sides. From the above, the terminal rod fitting of the obtained terminal assembly part
The lead piece 8 for leading out the electrode of the capacitor body 7 is connected to the flat portion of the lower end of the 6a, which is shaped like a collar, by welding or soldering,
It has a product structure in which it is housed in a container (case) 9 and the terminal assembly is sealed in the container 9 by seam processing as described above.

That is, the insulation of the electrode portion of the capacitor body 7 and the lead piece 8 for drawing out the electrode, the container 9, and the metal lid 1 is ensured by the insulating plate 2 made of a paper press board and the insulating paper tube 10. Moreover, the product external insulation of the space insulation distance and the creepage insulation distance between the terminals having different polarities and between the terminal and the ground (metal lid 1) is ensured by the terminal insulation cup 4 made of plastic.

However, in the above-described conventional configuration, the capacitor body 7
Development of insulating material design. Although the size of the capacitor body 7 has been reduced by improving the insulating oil and the construction method,
In the case of a composite capacitor, the problem of securing the product external insulation such as the space insulation distance and the creepage insulation distance between the terminal fittings 6 of the terminal assembly portion and between the terminal fittings 6 and the ground (metal lid 1) by downsizing, Due to the reduced size of the capacitor body 7, the distance between the lead pieces 8 for electrode lead-out is shortened, and the insulation distance between the lead pieces 8 and between the discharge resistors 5 is also a problem for ensuring the insulation inside the product. ing. Due to the above-mentioned problems in product structure design, it has been impossible to provide a downsized composite capacitance capacitor.

For reference, the regulations for the insulation distance of capacitors in Japan are legally stipulated by the technical standards for electrical appliances under the Electrical Appliance and Material Control Law.Specifically, the clearance (creep distance) of a rated voltage exceeding 1500V and 2000V or less Is 7 mm or more,
Similarly, the clearance of the rated voltage exceeding 2000V and 3000V or less is specified as 10mm or more, and it is necessary to pay attention to the design together with the performance such as withstand voltage and insulation resistance.

The present invention solves the above problems, and an object of the present invention is to provide an inexpensive composite capacitance capacitor that is miniaturized and satisfies withstand voltage insulation performance.

Means for Solving the Problems To achieve this object, a composite capacitor of the present invention uses a terminal metal fitting, a metal lid, and a terminal insulating cup made of an integrally molded plastic product for insulation between the terminal metal fittings. A plastic integral molded product is used for the insulating member of the metal lid facing the inside of the container that houses the body, and the partition of the insulating member consisting of the plastic integral molded product between the terminal rod fittings and the installation location of the discharge resistor is separated by the partition wall. The height is 2 mm or more.

With this structure, the composite capacitor of the present invention uses the terminal insulating cup made of a plastic integrally molded product to secure the insulation of the space between the terminal fittings and the space between the terminal fittings and the ground and the creepage insulation distance outside the product. Will be achieved. In addition, the insulation height of the insulation members made of plastic integrally molded parts between the terminal rod fittings and the installation location of the discharge resistor is made to be 2 mm or more, so that the insulation distance between the respective members can be easily made. It is possible to secure the insulation inside the product which can guarantee the withstand voltage insulation performance.

Embodiment A composite capacitor of one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a wiring diagram and an external view of a composite capacitor according to an embodiment of the present invention. The structure of the terminal portion assembly structure shown in FIG. 2 and the product sectional view shown in FIG. 3 will be described below. It will be explained with reference to FIG.

2 and 3, a miniaturized metal lid 21 having an insulating oil-impregnated hole 21a, which is in contact with the open end of a container 19 that houses the capacitor body 17, is sealed with the container 19 by seam processing. The structure. Each of the terminal rod fittings 11a, 12a, 11a, which penetrates through the insulating member 14 formed of a plastic integrally molded product having a plurality of partition walls 14a and penetrates the metal lid 21 through the packing rubber 3, is integrally molded with the plastic. A terminal insulating cup (15) having a higher cup height at the central part is inserted, and the terminal fittings (11, 12, 13) are fitted and integrated. The outer terminal fittings 11 and 13 are higher in height than the central terminal fitting 12. And the terminal rod fittings 11, 1 on both outer sides
A flat lead-out metal fitting 5b of the discharge resistor 5 is welded to the lower end of 3. The partition wall 14a of the insulating member 14 made of a plastic integrally molded product is used for each terminal rod fitting 11a, 12
The partition height l by the partition wall 14a between a and 13a and the installation location of the discharge resistor 5 is configured to be l ≧ 2 mm. Reference numeral 20 is an insulating paper cylinder that insulates the capacitor body 17 and the container 19.

The composite capacitance capacitor of the present embodiment configured as described above has a terminal insulating cup 15 made of a plastic integrally molded product.
As shown in FIG. 2, the space insulation distance A and the creepage insulation distance A between the terminal fittings 11, 12, 13 having different polarities, and the space insulation distance B between the terminal fittings 11, 12, 13 and ground are It is possible to provide a small-sized terminal portion structure that makes it easy to secure the creeping insulation distance B ′, has dimensions that satisfy the respective regulations, and that also satisfies the withstand voltage insulation performance.

In addition, the terminal insulation cup 15 made of a plastic integrated product
The material of is generally thermosetting resin, which has good mechanical strength and electrical performance like the conventional terminal insulating cup 4,
In this example, an unsaturated polyester resin was used. Of course, other molding materials may be used as long as there is no problem in quality performance and workability.

Next, the electrode lead-out lead pieces 8 of the compactly improved capacitor body 17 and the terminal rod fittings 11a, 12a, 13a connected to each other by welding or soldering, and the installation location of the discharge resistor 5 are partition walls. With the insulating member 14 of the present embodiment, which is a plastic integrally molded product having a plurality of partition walls 14a, each partition wall 14a having a partition height l of 1 ≧ 2 mm. When the flat paper press board insulating plate 2 shown in FIG. 7 is used for small capacitors, it is difficult to secure sufficient dielectric strength because the insulating distance between the conductive parts is short. The insulating member 14 of the embodiment makes it possible to easily secure a space / creep insulation distance C between the conductive parts.

The partition height l by the partition wall 14a was set to l ≧ 2 mm because the samples of the terminal assembly portion of the present invention shown in FIG. As a result of performing the dielectric breakdown voltage test, the dielectric breakdown voltage values shown in the graph of FIG. 4 were obtained. As a result, the rated voltage range is AC1.5k.
For V to AC3kV, if l dimension is 2mm or more, rated voltage A
Satisfies the withstand voltage test value DC6.45kV of C1.5kV product, l dimension is 4m
It was found that if it is m or more, it satisfies the withstand voltage test value DC12.9kV of AC3kV product.

From the above, the rated voltage range of the main subject of the present invention AC1.5kV ~ AC3
For a kV composite capacitor, if the l dimension is in the range of 2 mm to 4 mm, a satisfactory dielectric strength will be obtained in practical use.
However, the design of individual 1-dimensional products with dielectric strength corresponding to each rated voltage product is problematic in terms of actual use in terms of economic efficiency and standardization. operate.

In carrying out the above dielectric strength breakdown test, it is necessary to pay attention to the test method in consideration of the refining of the impregnated insulating oil, the test temperature, etc. so as not to give any doubt to the result or judgment.

As another method, the conventional paper pressboard insulating paper 2 can be press-bent to make it similar to the insulating member 14 of this embodiment, but the processing becomes complicated and the economy and workability at the time of terminal assembly are improved. Are inferior, and as a result are expensive. In that respect, plastic molded products can be easily manufactured by molds, and because the positioning of each part is easy, workability at the time of assembling the terminal part is good, so there is a sufficient merit including mold cost amortization. is there.

Further, as the molding material of the plastic molded insulating member 14 in this embodiment, PP (polypropylene), which is a thermoplastic resin, is adopted in consideration of economical efficiency.
It is necessary to determine it after examining and checking the insulating oil resistance and impact resistance.

As described above, according to the present embodiment, the terminal insulating cup 15 and the metal lid facing the inside of the container 19 are formed of a plastic integrally molded product.
A plastic integral molded product was used for the insulating member 14 of 19, and the molded product was provided between the respective terminal fittings 11, 12, 13 and at the installation location of the discharge resistor 5 with the partition height of the partition wall 14a of 2 mm or more. By this, it is possible to satisfy the insulation outside the product and the insulation inside the product of the space insulation distance and the creepage insulation distance between each terminal metal fitting 11, 12, 13 and between each terminal metal fitting 11, 12, 13-ground (metal lid 21). It is possible to provide a miniaturized composite capacitor terminal assembly.

Next, another embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a product external view of a composite capacitor according to another embodiment of the present invention. In FIG. 5, reference numeral 25 is a terminal insulating cup formed by plastic integral molding, 22 is a terminal fitting, and other configurations are the same as those of the embodiment shown in FIG.

The features and differences of the configuration will be described below.

First, in the embodiment shown in FIG. 1, the height of the terminal fittings 11 and 13 outside the central terminal fitting 12 is made higher, and the height of the terminal insulating cup 15 at the outer portion is followed in accordance with the height, and the height of the connecting receptacle insertion point tip part is connected. It is lower than 30 (terminal stopper), and the height of the insulating cup 15 in the center is almost the same as the height of the outer terminal fittings 11 and 13, and the height of the central terminal fitting 12 is set to the space / creep insulation distance. The point is that the regulation is secured and the breakdown voltage insulation performance is lowered to a height that can be satisfied.

On the other hand, in the other embodiment shown in FIG. 5, each terminal fitting 22 has the same height for common use, and the insulation cup has a height that satisfies the space / creep insulation distance and the pressure insulation performance.
The height of 25 is the same.

Depending on the convenience of each user, the usage conditions of these are different, and depending on the specific connection location, a receptacle with a housing insulating cover may be used to connect with the capacitor terminal fittings. Since the portion is made smaller than the conventional one, the housing insulating cover may come into contact with the tip of the terminal insulating cup, which may make connection difficult. The embodiment of FIG. 1 has a design corresponding to this case. In other words, the outer terminal metal fittings 11 and 13 are designed with a well-balanced height of the terminal insulation cup 15 in consideration of space and creepage distance so that they can be handled without contact when inserting and connecting the receptacle with a housing insulating cover. .

On the other hand, the other embodiment shown in FIG. 5 is designed so as not to require a housing insulating cover or to have a vinyl-coated insulating cover and does not require a volume space of the receptacle, and the terminal metal fitting 22 is commonly used. Also, by making the heights of the terminal insulating cups 25 the same, it is possible to provide a more compact terminal assembly with a simple structure.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments, according to the composite capacitor of the present invention, the conventional terminal insulating cups made of plastic for external insulation are replaced by the terminal insulating cups made of plastic integrally molded products. , It is easy to secure the external insulation of the space and the creepage distance between the different-polarity terminal fittings and between the terminal fittings and the ground. Also, the insulating plate made of the conventional flat paper press board for internal insulation is made of a plastic molded product. By using an insulating member that has partition walls that are placed with a partition height of 2 mm or more between each terminal metal fitting and the location where the discharge resistor is installed, it is possible to facilitate the withstand voltage insulation performance of each member. Insulation structure inside the product can be satisfied, workability at the time of assembling each terminal is greatly improved, and cost reduction is achieved by downsizing and weight saving. It is possible to provide a powerful composite capacitor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a circuit connection diagram of a composite capacitor according to an embodiment of the present invention, and FIG.
(C) is a front view of the outer shape of the product, FIG. 2 shows the terminal part assembly structure, (a) is a top view, (b) is a longitudinal sectional view showing the main part, (c) is a bottom view, and FIG. FIG. 5 is a longitudinal sectional view of an essential part showing the entire product structure, and FIG. 4 is a graph showing the relationship between the partition height l of the plastic insulating member by the partition wall and the dielectric breakdown voltage between the conductive parts. Shows a product external shape of a composite capacitance capacitor in another embodiment of the present invention, (a) is a plan view, (b) is a front view showing a vertical cross-sectional view of a part of a main portion, and FIG. 6 is a conventional composite capacitance capacitor. (A) is a circuit connection diagram,
(B) is a plan view of the outer shape of the product, (c) is a front view of the outer shape of the product showing a vertical cross-section of a part of the main part, FIG. 7 shows the terminal part assembly structure, (a) is a top view, (b) ) Is a longitudinal sectional view showing the main part,
FIG. 8C is a bottom view, and FIG. 8 is a longitudinal sectional view of an essential part showing the entire structure of the product. 5 ... Discharge resistor, 11,12,13 ... Terminal metal fittings, 11a, 12a, 13
a …… Terminal rod fittings, 14 …… Insulation member, 14a …… Partition wall, 15…
… Terminal insulation cup, 17… Capacitor body, 19… Container, 21… Metal lid.

Claims (3)

[Claims] 1. A container for accommodating a capacitor body, a metal lid disposed in contact with an open end of the container for sealing the container, and one end connected to the capacitor body, the metal lid Composite having a plurality of terminal rod fittings penetratingly attached, terminal fittings fitted to the other ends of the plurality of terminal rod fittings, and a discharge resistor connected to one end of the terminal rod fitting A capacitive capacitor, comprising an insulating member integrally formed of plastic, which is disposed in the container and insulates between the terminal rod fitting and the discharge resistor and between the terminal rod fittings by a partition wall. Is a composite capacitor. 2. A partition which is disposed outside the container and insulates between the terminal fitting and the metal lid and between the terminal fittings by a partition wall.
The composite capacitor according to claim 1, further comprising a terminal insulating cup integrally molded of plastic. 3. The composite capacitor according to claim 1 or 2, wherein the partition height of the insulating member by the partition wall is 2 mm or more.