JP2969662B2 - Aluminum electrolytic capacitor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor element having a lead, an outer case in which the capacitor element is provided through one end opening, and a sealing plate for sealing the one end opening of the outer case. ,
The present invention relates to an aluminum electrolytic capacitor having a terminal attached to the sealing plate and connected to the lead-out lead, and more particularly to a means for fixing the capacitor element when enclosing the capacitor element in a case.

2. Description of the Related Art As shown in FIGS. 4 and 5, in a conventional aluminum electrolytic capacitor of this type, when a capacitor element 1 is provided in an outer case 2 through an opening 2a at one end thereof, first, a thermoplastic resin is used. Is heated and melted to form an outer case 2
After that, the capacitor element 1 is inserted, and the fixing agent 3 is hardened by natural cooling, thereby fixing the outer case 2 and the capacitor element 1.

However, in the above-described conventional configuration, the fixing agent 3
Is made of a thermoplastic resin such as polypropylene, the fixing agent 3 is softened when the ambient temperature of the aluminum electrolytic capacitor increases, and when vibration is applied, the function of fixing the capacitor element 1 is reduced. As a result, the drawer lead 4 is disconnected at the portion of the terminal 5 connected to the lead lead 4 of the capacitor element 1, and the basic function as a capacitor is lost.

Further, since the thermoplastic resin constituting the fixing agent 3 is a combustible material, for example, when the safety valve 7 provided on the sealing plate 6 is operated when an abnormal load is applied to the capacitor, the fixing agent 3 made of the thermoplastic resin is used. Had a risk that it would flow out and that this fixative 3 would burn.

Further, when the capacitor element 1 is inserted and fixed in the outer case 2, first, the fixing agent 3 is heated and melted and poured into the outer case 2, and then the capacitor element 1 is inserted into the outer case 2, and thereafter, Since the fixing agent 3 must be left to be cured by natural cooling, there is a problem that productivity is reduced.

The present invention solves such a problem, and can fix the capacitor element and the outer case without using a thermoplastic resin which is a combustible material, and has good vibration resistance at high temperatures, and furthermore, in terms of productivity. It is another object of the present invention to provide an excellent aluminum electrolytic capacitor.

Means for Solving the Problems In order to solve the above problems, the present invention provides a capacitor element having a lead, an outer case in which the capacitor element is installed from one end opening, and one end opening of the outer case is sealed. It has a sealing plate and a terminal attached to the sealing plate and connected to the lead-out lead,
On the back surface of the sealing plate, a projection fitted into a hole at a substantially central portion of the upper surface of the capacitor element, and a plurality of fixing ribs for abutting on the upper surface of the capacitor element and pressing down the capacitor element are radially provided, and A capacitor element fixing tool is disposed between the bottom of the capacitor element and the inner bottom of the outer case. The capacitor element fixing tool has a fixing rod that is fitted into a substantially central hole on the bottom surface of the capacitor element. And a plurality of fixing portions which are formed radially from the fixing rods, and whose tips contact the inner side wall of the outer case when the capacitor element is pressed by a plurality of fixing ribs provided radially on the back surface of the sealing plate. It is comprised by these.

According to the above configuration, when the capacitor element is fixed to the outer case, one end of the capacitor element has a projection provided on the back surface of the sealing plate fitted into a substantially central hole on the upper surface of the capacitor element, and The upper surface of the capacitor element is positioned and fixed by pressing the upper surface of the capacitor element with a plurality of fixing ribs provided radially on the back surface of the sealing plate, and the other end of the capacitor element is located between the bottom of the capacitor element and the inner bottom of the outer case. The fixing rod of the capacitor element fixing tool disposed on the bottom of the capacitor element is fitted into the hole at the substantially central portion of the bottom surface of the capacitor element, and the tips of a plurality of fixing parts formed radially from the fixing rod are connected to the sealing plate. When the capacitor element is pressed down by a plurality of fixing ribs provided radially on the back surface of the outer case, it is fixed by contacting the inner wall of the outer case. Further, the capacitor element can be reliably positioned and fixed without using a fixing agent made of a thermoplastic resin which is a combustible material as in the related art, and as a result, safety can be improved.

In addition, the projections and the fixing ribs of the sealing plate, which are not easily softened by the temperature rise, and the capacitor element fixing device disposed between the bottom of the capacitor element and the inner bottom of the outer case are used for the capacitor element. The problem is that the capacitor is used in a high-temperature atmosphere as in the past, and the lead is disconnected when vibration is applied to the capacitor, as it has been fixed. Therefore, an aluminum electrolytic capacitor having excellent vibration resistance can be obtained.

Further, since it is not necessary to use a fixing agent which is heated and melted as in the prior art, it is possible to assemble at room temperature, and it is possible to remarkably improve productivity since no standing time for cooling is required.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 3, a bottomed cylindrical outer case 11 having an opening 11a at one end is provided with a capacitor element fixture 12 made of aluminum inside, and the capacitor element fixture 12 is provided with a capacitor. A fixing rod 12a fitted into a hole 13a substantially at the center of the bottom surface of the element 13;
The three fixing portions 12b are formed radially at an interval of 120 degrees from each other, and when the capacitor element 13 is pressed down by the sealing plate 14 made of a thermosetting resin, the front end portion contacts the inner wall of the outer case 11. It is configured. The capacitor element 13 has a plurality of lead leads from the end face.
15 and the lead 15 is a sealing plate.
Combined with 14 terminals 16 Further, the sealing plate 14 has a projection 14a fitted on the back surface into a hole 13b substantially at the center of the upper surface of the capacitor element 13, and a capacitor element 13
Three fixing ribs 14b provided radially to press the upper surface of the outer case 11;
It seals 1a.

Further, since the three fixing portions 12b provided on the capacitor element fixing tool 12 are configured to be bent at the base portion by aluminum, the size of the diameter formed by the three fixing portions 12b can be freely determined. It can be changed.

Next, the case where the capacitor element 13 is fixed in the outer case 11 in the above configuration will be described. First, the fixing rod 12a of the capacitor element fixture 12 is inserted into the hole 13a at the bottom of the capacitor element 13. In this case, the three fixing portions 12b provided on the fixing device 12 of the capacitor element are bent at the root portion, and the size of the diameter formed by the three fixing portions 12b is larger than the size of the inner diameter of the outer case 11. Make it smaller in advance. And thus the capacitor element fixture
The capacitor element 13 is mounted in the outer case 11 with the 12 fixing rods 12a inserted into the holes 13a at the bottom of the capacitor element 13. Thereafter, when the sealing plate 14 that couples the lead 15 of the capacitor element 13 to the terminal 16 is inserted into the outer case 11 through one end opening 11a of the outer case 11, the projection 14a of the sealing plate 14 The three fixed ribs 14b radially provided press down on the upper surface of the capacitor element 13 while being fitted into a hole 13b located substantially at the center of the upper surface of the capacitor element 13. In this case, the three fixing portions 12b provided on the capacitor element fixing tool 12 are spread outward by pressing down the capacitor element 13, and finally, the distal ends of the three fixing portions 12b become the outer case. 11 abuts against the inner wall.

According to the configuration of the above-described embodiment, the capacitor element fixture 12 for fixing the capacitor element 13 is made of aluminum, and the projections 14a and the fixing ribs 14b provided on the sealing plate 14 are made of a thermosetting resin. Therefore, the heat resistance is high, and the fixing of the capacitor element 13 to the outer case 11 is performed by the protrusions 14a and the fixing ribs 14b of the sealing plate 14,
Since the capacitor element fixing tool 12 disposed between the bottom of the capacitor element 13 and the inner bottom of the outer case 11 is used, the fixing can be reliably performed, and as a result,
Even if the capacitor is used in a high-temperature atmosphere and vibration is applied to the capacitor, the problem that the extraction lead 15 is disconnected is eliminated, so that the vibration resistance at high temperatures can be greatly improved. is there.

In addition, since the sealing plate 14 and the capacitor element fixture 12 are not flammable, they are excellent in safety. In addition, since the step of heating and melting the fixing agent and pouring it into the outer case as in the conventional case can be omitted, the standing time for lowering the capacitor element by natural cooling to room temperature is unnecessary, and as a result, productivity is reduced. Can be greatly improved.

According to the aluminum electrolytic capacitor of the present invention, when the capacitor element is fixed to the outer case, the protrusion provided on the back surface of the sealing plate is substantially centered on the upper surface of the capacitor element. The one end of the capacitor element is positioned and fixed by pressing the top surface of the capacitor element with the plurality of fixing ribs radially provided on the back surface of the sealing plate while being fitted into the hole of the part, and the bottom of the capacitor element and the outer case A fixing rod of the capacitor element fixing tool disposed between the fixing element and the inner bottom of the capacitor element is fitted into a substantially central hole of the bottom surface of the capacitor element, and a plurality of fixing parts radially formed from the fixing rod are formed. When the capacitor element is pressed down by the fixing rib provided on the back surface of the sealing plate, the front end is fixed by contacting the inner wall of the outer case. As a result, the capacitor element can be reliably positioned and fixed without using a fixing agent made of a flammable thermoplastic resin as in the related art, thereby improving safety. It can be achieved.

In addition, the projections and the fixing ribs of the sealing plate, which are not easily softened by the temperature rise, and the capacitor element fixing device disposed between the bottom of the capacitor element and the inner bottom of the outer case are used for the capacitor element. The problem is that the capacitor is used in a high-temperature atmosphere as before, and the lead is disconnected when vibration is applied to the capacitor, since the capacitor is fixed. Therefore, an aluminum electrolytic capacitor having excellent vibration resistance can be obtained.

Further, since it is not necessary to use a fixing agent which is heated and melted as in the related art, the assembly can be performed at room temperature, and a standing time for cooling is not required, so that productivity can be significantly improved. .

[Brief description of the drawings]

FIG. 1 is a perspective view of an aluminum electrolytic capacitor showing an embodiment of the present invention, in which a sealing plate is put out, FIG. 2 is a sectional view of the electrolytic capacitor, and FIG. FIG. 4 is a perspective view showing a relative relationship between a capacitor element and a capacitor element fixture, FIG. 4 is a perspective view showing a conventional aluminum electrolytic capacitor, and FIG. 5 is a sectional view of the electrolytic capacitor. 11 ... outer case, 11a ... one end opening, 12 ... capacitor element fixing tool, 12a ... fixing rod, 12b ... fixing part, 13 ...
… Capacitor element, 13a, 13b… Hole, 14… Sealing plate, 1
4a: Projection, 14b: Fixing rib, 15: Lead-out lead, 16: Terminal.

Continuation of the front page (72) Inventor Yukihiro Matsuo 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References Japanese Utility Model Sho 54-86645 (JP, U) Japanese Utility Model Sho 48-38341 , U) (58) Field surveyed (Int. Cl. ⁶ , DB name) H01G 9/06

Claims (1)

(57) [Claims] 1. A capacitor element having a lead lead,
An outer case in which the capacitor element is provided from one end opening, a sealing plate for sealing the one end opening of the outer case, and a terminal attached to the sealing plate and connected to the lead-out lead; On the back surface of the plate, a projection fitted into a hole at a substantially central portion of the upper surface of the capacitor element, and a plurality of fixing ribs for abutting against the upper surface of the capacitor element and pressing down the capacitor element are radially provided, and A capacitor element fixing tool is disposed between the bottom of the capacitor element and the inner bottom of the outer case, and the capacitor element fixing tool has a fixing rod fitted into a hole at a substantially central portion of the bottom surface of the capacitor element. When the capacitor element is pressed down by a plurality of fixing ribs which are formed radially from the fixing rod and are provided radially on the back surface of the sealing plate, the distal end portion has an outer case. Aluminum electrolytic capacitor configured inside wall of the scan by a plurality of fixing portions abutting.