JPH10197389A - Device for inspecting aluminum electrolytic capacitor for airtightness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To incorporate the airtightness inspection of an aluminum electrolytic capacitor in the production line of the capacitor by feeding a fixed quantity of compressed air to a closed container through an air inlet port and detecting the variation of the air pressure in the container after a specific period of time has elapsed. SOLUTION: After an aluminum electrolytic capacitor 12 is put in a closed container 11, the opening of the container 11 is closed with a lid 14 and a fixed quantity of compressed air is fed to the container 11 through an adjusting valve 16. At the time of feeding the compressed air, the air pressure in the container 11 is preset to such a level that the metallic case of the capacitor 12 is not squashed and, after the fixed quantity of compressed air is fed, the container 11 is maintained as it is for a specific period of time and the variation of the air pressure in the container 11 is detected with a pressure gauge 17. When the capacitor 12 is not defective, the inside of the container 11 is maintained at the specific air pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airtightness inspection apparatus for an aluminum electrolytic capacitor.

[0002]

2. Description of the Related Art Generally, an aluminum electrolytic capacitor is constructed as shown in FIG. 6, that is, in FIG.
Is formed by roughening a high-purity aluminum foil and winding an anode foil having a dielectric oxide film formed on the surface thereof and a cathode foil made of aluminum foil with a separator interposed therebetween.

[0003] Reference numeral 2 denotes a metal case made of aluminum having a bottomed cylindrical shape. The metal case 2 accommodates the capacitor element 1 impregnated with a driving electrolyte. Reference numeral 3 denotes a sealing member provided at an opening of the metal case 2. The sealing member 3 is formed by bonding a rubber-like elastic body 3a and a laminated phenol plate 3b, and a lead member 4 is attached to the capacitor element 1. Connected through. After disposing the sealing member 3 in the opening of the metal case 2, the opening end of the metal case 2 is curled and sealed to form the aluminum electrolytic capacitor 5.

When the airtightness of the aluminum electrolytic capacitor 5 is inspected, conventionally, as shown in FIG.
The aluminum electrolytic capacitor 5 is immersed in a transparent container 7 containing hot water 6 at 5 ° C. or higher, and the air in the aluminum electrolytic capacitor 5 is expanded to visually check bubbles 8 coming out of the hot water 6. If the air bubbles 8 are continuously generated, it is determined that the airtightness is poor.

[0005]

However, the above-mentioned conventional airtightness inspection method has the following problems.

That is, in the conventional airtightness inspection method, since hot water 6 having a temperature of 95 ° C. or higher is used, if a large amount of aluminum electrolytic capacitor 5 is put into the hot water 6, it becomes difficult to control the temperature, and the bubbles 8 Since the detection method has to rely on visual observation, it is very difficult to incorporate it into a production line and perform 100% inspection.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an aluminum electrolytic capacitor airtightness inspection device which can be incorporated into a production line to perform an airtightness inspection of an aluminum electrolytic capacitor. Is what you do.

[0008]

Means for Solving the Problems To achieve the above object, an airtightness inspection apparatus for an aluminum electrolytic capacitor according to the present invention comprises a capacitor formed by winding an anode foil and a cathode foil with a separator interposed therebetween. The element is impregnated with a driving electrolyte, the capacitor element is housed in a bottomed cylindrical metal case, a sealing member is provided at the opening of the metal case, and the opening end of the metal case is curled. A sealed container for accommodating the sealed aluminum electrolytic capacitor, an air inlet provided in the sealed container and for injecting compressed air into the sealed container, and a sealed container through the air inlet. And a pressure gauge for detecting a change in air pressure in the closed container after a lapse of a specified time of a fixed amount of compressed air injected into the inside of the production line. It is capable of performing a total inspection of the leak test of aluminum electrolytic capacitors put.

[0009]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, a driving element is impregnated into a capacitor element constituted by winding an anode foil and a cathode foil with a separator interposed therebetween. An aluminum electrolytic capacitor, in which the capacitor element is housed in a bottomed cylindrical metal case, a sealing member is provided at the opening of the metal case, and the opening end of the metal case is curled and sealed. A closed container for storing the condenser, an air inlet provided in the closed container for injecting compressed air into the closed container, and a certain amount of compressed air injected into the closed container via the air inlet. A pressure gauge that detects a change in air pressure in the sealed container after a lapse of a specified time of air. According to this configuration, if the aluminum electrolytic capacitor is a good product, a fixed amount of compressed air is injected. The inside of the sealed container is kept at the specified air pressure, while if the aluminum electrolytic capacitor is defective, the compressed air enters the aluminum electrolytic capacitor and the air pressure in the sealed container changes, and The change in air pressure is detected by a pressure gauge, and the quality of defective or defective products can be determined in a short time. By incorporating this device into the production line, 100% inspection of the airtightness of aluminum electrolytic capacitors can be realized. Things.

According to a second aspect of the present invention, a capacitor element constituted by winding an anode foil and a cathode foil with a separator interposed therebetween is impregnated with a driving electrolyte.
An aluminum electrolytic capacitor in which this capacitor element is housed in a bottomed cylindrical metal case, a sealing member is provided in the opening of this metal case, and the opening end of the metal case is curled to seal. An airtight container that forms an airtight space with an aluminum electrolytic capacitor by bringing an elastic member into close contact with the curling portion of
And an air inlet for injecting compressed air into the closed space, and an air pressure in the closed space after a lapse of a predetermined time of a fixed amount of compressed air injected into the closed space via the air inlet. According to this configuration, if the aluminum electrolytic capacitor is a good product, the sealed space in which a fixed amount of compressed air has been injected is maintained at the specified air pressure, while If the aluminum electrolytic capacitor has poor airtightness, compressed air will enter the aluminum electrolytic capacitor and the air pressure in the enclosed space will change. By incorporating this device into a production line in order to determine the quality of a defective product in a short time, it is possible to realize a 100% inspection of the airtightness of an aluminum electrolytic capacitor.

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an airtightness inspection device for an aluminum electrolytic capacitor according to an embodiment of the present invention. In FIG.
The closed container 11 is formed in a cylindrical shape with a bottom, and a lid 14 that can be opened and closed via a rubber packing 13 is attached to the opening. Reference numeral 15 denotes an air injection port provided at the bottom of the closed container 11 for injecting compressed air into the closed container 11 through the air injection port 15. Reference numeral 16 denotes an adjustment valve, and the adjustment valve 1
6 to adjust a certain amount of compressed air
1 is injected. Reference numeral 17 denotes a pressure gauge that detects a change in air pressure in the closed container 11.

The aluminum electrolytic capacitor 12 has a structure as shown in FIG. 2A. In FIG. 2A, reference numeral 18 denotes a capacitor element, and the capacitor element 18 is a high-purity aluminum. Roughening the foil,
It is configured by winding an anode foil having a dielectric oxide film formed on its surface and a cathode foil made of aluminum foil with a separator interposed therebetween. Reference numeral 19 denotes a bottomed cylindrical metal case made of aluminum. The metal case 19 accommodates the capacitor element 18 impregnated with a driving electrolyte.

Reference numeral 20 denotes a sealing member provided at the opening of the metal case 19, and the sealing member 20 is a rubber-like elastic body 20a.
And a laminated phenol plate 20b, and a lead member 21 is attached to the capacitor element 18.
Connected through. After disposing the sealing member 20 at the opening of the metal case 19, the opening end of the metal case 19 is curled to seal the aluminum electrolytic capacitor 12.

In the above configuration, when the airtight inspection of the aluminum electrolytic capacitor 12 is performed,
2 is placed in the closed container 11, and then the opening of the closed container 11 is closed with the lid 14, and the adjustment valve 16 is placed in the closed container 11.
A fixed amount of compressed air is injected through. At this time, the air pressure in the sealed container 11 is previously set to the aluminum electrolytic capacitor 12.
Is set to a level at which the metal case 19 is not crushed, and after injecting a fixed amount of this compressed air, the pressure is maintained for a specified time and the change in air pressure in the sealed container 11 at that time is detected by the pressure gauge 17. Things.

At this time, if the aluminum electrolytic capacitor 12 is a non-defective product, a certain amount of compressed air is injected into the sealed container 11 except for the volume of the aluminum electrolytic capacitor 12. Is maintained at a specified air pressure.

However, as shown in the enlarged view of FIG. 2B, the distal end of the metal case 19 is
In the case of the aluminum electrolytic capacitor 12 which has not penetrated into the airtight and is not airtight, the compressed air in the closed container 11 enters the aluminum electrolytic capacitor 12 as shown in FIG. Will fall below the specified value, and this change in air pressure will be
Is detected to determine that the product is defective.

FIG. 4 shows an example of air pressure change data of a non-defective product and a non-defective product measured by an airtightness inspection device for an aluminum electrolytic capacitor according to an embodiment of the present invention.

As is apparent from FIG. 4, the closed container 1
In the determination time after the air pressure in 1 has been held for the specified time, if the air pressure in the closed container 11 has been held for the specified time in the determination time after the air pressure in the closed container 11 has been held for the specified time if the air pressure in the sealed container 11 is within the specified value range. If the value falls below the standard value, it is determined that the product is defective.

Table 1 shows life test data of an aluminum electrolytic capacitor in which an airtightness inspection apparatus for an aluminum electrolytic capacitor according to an embodiment of the present invention determines whether the product is good or defective.

[0020]

[Table 1]

As is clear from Table 1, a liquid determined to be defective was leaked, but a liquid determined to be good was not leaked.

FIG. 5 shows an airtightness inspection device for an aluminum electrolytic capacitor according to another embodiment of the present invention. This airtightness inspection device is similar to the embodiment shown in FIG. Instead of performing an airtight inspection of the entire aluminum electrolytic capacitor, a partial airtight inspection of the aluminum electrolytic capacitor is performed.

That is, the opening end of the metal case 19 is curled to perform an airtight inspection of a portion where sealing is performed. In FIG. 5, reference numeral 31 denotes a closed cylindrical container having a bottom. The closed container 31 has an elastic member 32 made of rubber attached to an open end. The elastic member 32 is provided with an annular concave portion 32a so that the curled portion 33a of the aluminum electrolytic capacitor 33 comes into close contact with the aluminum electrolytic capacitor 33.
The tightly curled portion 33a makes it possible to close the closed space 3 between the closed container 31 and the aluminum electrolytic capacitor 33.
4. Reference numeral 35 denotes an air inlet provided at the bottom of the closed container 31 for injecting compressed air into the closed space 34 through the air inlet 35.
Numeral 36 denotes an adjusting valve for injecting a fixed amount of compressed air into the closed space 34 by adjusting the adjusting valve 36. Reference numeral 37 denotes a pressure gauge for detecting a change in air pressure in the closed space 34.

In the above configuration, when the airtightness inspection of the aluminum electrolytic capacitor 33 is performed, first, the curling portion 33a of the aluminum electrolytic capacitor 33 is brought into close contact with the concave portion 32a of the elastic member 32 attached to the open end of the closed container 31. The closed container 31 and the aluminum electrolytic capacitor 33
Form a closed space 34, and in this state, the closed space 34
A fixed amount of compressed air is injected through the regulating valve 36 therein. After injecting a fixed amount of the compressed air, the pressure is maintained for a specified time, and a change in air pressure in the sealed space 34 at that time is detected by the pressure gauge 37.

At this time, if the aluminum electrolytic capacitor 33 is a non-defective product, a fixed amount of compressed air is injected into the closed space 34, so that the inside of the closed space 34 is maintained at a specified air pressure. is there. However, in the case of the aluminum electrolytic capacitor 33 having poor airtightness, the compressed air in the sealed space 34 enters the aluminum electrolytic capacitor 33, so that the air pressure in the sealed space 34 falls below a specified value, and This change in air pressure is measured by a pressure gauge 37.
Is detected to determine that the product is defective.

[0026]

As described above, the airtightness inspection apparatus for an aluminum electrolytic capacitor according to the present invention provides a drive electrolyte to a capacitor element constituted by winding an anode foil and a cathode foil with a separator interposed therebetween. The capacitor element was impregnated, housed in a cylindrical metal case having a bottom, a sealing member was provided at the opening of the metal case, and the opening end of the metal case was sealed by curling. A sealed container for accommodating the aluminum electrolytic capacitor, an air inlet provided in the sealed container and for injecting compressed air into the sealed container, and a fixed amount injected into the sealed container through the air inlet And a pressure gauge that detects a change in air pressure in the closed container after a lapse of a specified time of the compressed air. According to this configuration, if the aluminum electrolytic capacitor is a good product, the constant The pressure inside the sealed container filled with compressed air is maintained at the specified air pressure.On the other hand, if the aluminum electrolytic capacitor has poor airtightness, the compressed air enters the aluminum electrolytic capacitor and the air pressure in the sealed container changes. In order to detect the change of air pressure with a pressure gauge and determine whether the product is good or defective in a short time, this device is incorporated into the production line to check the airtightness of aluminum electrolytic capacitors. This has an excellent effect that all the inspections can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of an airtightness inspection device for an aluminum electrolytic capacitor according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view of an aluminum electrolytic capacitor inspected by the airtightness inspection apparatus, and FIG.

FIG. 3 is a sectional view showing a flow of compressed air to the aluminum electrolytic capacitor.

FIG. 4 is a diagram showing an example of air pressure change data of a good product and a defective product measured by the airtightness inspection device for the aluminum electrolytic capacitor.

FIG. 5 is a sectional view showing the configuration of an airtightness inspection device for an aluminum electrolytic capacitor according to another embodiment of the present invention.

FIG. 6 is a sectional view showing a general aluminum electrolytic capacitor.

FIG. 7 is a sectional view showing a conventional airtightness inspection apparatus for an aluminum electrolytic capacitor.

[Explanation of symbols]

 11, 31 Closed container 12, 33 Aluminum electrolytic capacitor 15, 35 Air inlet 17, 37 Pressure gauge 18 Capacitor element 19 Metal case 20 Sealing member 32 Elastic member 33a Curling portion 34 Closed space

Continuation of the front page (72) Inventor Hiroharu Fujisawa 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] A capacitor element constituted by winding an anode foil and a cathode foil with a separator interposed therebetween is impregnated with a driving electrolyte, and the capacitor element is placed in a bottomed cylindrical metal case. A sealed container for storing and sealing an aluminum electrolytic capacitor in which a sealing member is disposed at the opening of the metal case and the opening end of the metal case is curled and sealed, and provided in the sealed container. And an air inlet for injecting compressed air into the closed container, and the air pressure in the closed container after a lapse of a predetermined time of a predetermined amount of compressed air injected into the closed container through the air inlet. An airtightness inspection device for aluminum electrolytic capacitors equipped with a pressure gauge that detects changes. 2. A capacitor element constituted by winding an anode foil and a cathode foil with a separator interposed therebetween, impregnating a driving electrolyte, and placing the capacitor element in a bottomed cylindrical metal case. Along with the storage, a sealing member is arranged at the opening of the metal case, and the elastic end is brought into close contact with the curled portion of the aluminum electrolytic capacitor in which the opening end of the metal case is curled and sealed. A closed container that forms a closed space by the condenser, an air inlet provided in the closed container and for injecting compressed air into the closed space, and injected into the closed space via the air inlet. An airtightness inspection device for an aluminum electrolytic capacitor, comprising: a pressure gauge for detecting a change in air pressure in a sealed space after a specified amount of compressed air has passed for a specified time.