JPS6017887Y2 - Capacitor with safety device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a capacitor with a safety device that prevents explosion upon dielectric breakdown and completely prevents the risk of re-explosion.

Generally, when MP capacitors, paper capacitors, and film capacitors suffer dielectric breakdown due to various factors such as deterioration of characteristics, excessive rise in ambient temperature, and application of overvoltage, internal pressure increases and an explosion occurs.

Therefore, there is a serious problem in that not only the capacitor itself is burned out, but also the attached equipment and parts are burned out.

Therefore, it is necessary to prevent these problems, and various proposals have been made.

Conventionally, round capacitors were configured to cut off the current by cutting off the lead wire connecting the external terminal and the capacitor element by utilizing the bulge in the sealing plate that functions as the internal pressure and temperature rise. There is.

However, when the temperature returns to normal and the sealing plate bulges back to its original state, the lead wires that were once cut will come into contact again, reproducing the explosive situation.

However, this phenomenon is a number. As the heat is repeated, the amount of heat increases, resulting in burnout of the capacitor, attached equipment, and parts, and the problem has not been solved yet.

Therefore, as shown in FIG. 1, the lead wires 5a and 5b connected to the external terminals 4a and 4b are inserted between the sealing plate 1 and the fixture 2 having a concave cross section against the spring body at the eyelet 6a of the fixture 2 having a concave cross section. , 6b, and when the internal pressure rises, the internal pressure is passed through the impregnating agent inlet/exhaust hole 9 provided at any location of the fixture 2 having a concave cross section to inflate the sealing plate 1 and cut the lead wire 5at5b. , the lead wires 5a, 5b
Due to the presence of the spring body 3 extended by cutting the sealing plate 1
A device is being considered that prevents contact with the skin again even if the bulge returns to its original state.

However, since the sealing body 1 and the fixing member 2 having a concave cross section are each made of a hard material and are simply pressed into contact with each other, if the internal pressure increases due to dielectric breakdown, the impregnant inflow hole/exhaust hole 9 will pass through the cross section. Case 8 in which the internal pressure concentrated inside the concave fixing device 2 wets the contact area between the concave cross-section fixing device 2 and the sealing plate 1 and can be concentrated in the center of the sealing plate 1.
As a result of being dispersed throughout the interior, the seaming portion 1 of the opening of the case 8
0 is pushed up and the sealing plate 1 comes off, resulting in the same result as an explosion.

The present invention was developed in view of the above points, and a silicone rubber ring is disposed between the sealing plate and a fixture with a concave cross section that has an impregnating agent inflow hole and exhaust hole at an arbitrary location, and an external terminal and a cross section By connecting the lead wires between the recessed fixtures while pressing the silicone rubber ring, the current can be cut off reliably in the event of insulation breakdown, and at the same time, the lead wires that have been cut can be prevented from coming into contact with each other again. The purpose is to provide a capacitor with a high performance safety device.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

That is, as shown in FIG. 2, a sealing plate 12 made of a rubber plate and a polypropylene plate, a polyethylene plate, a polycarbonate plate, etc. bonded together with the external terminals 11a and 11b is bonded to the back surface of the sealing plate 12, as shown in FIGS. 3A and 3B. A collar 13 is placed around the impregnating agent inlet and exhaust hole 14a at any location.
14 b.

14c...... and lead wire fixing parts 15a, 15b are formed, and the insulating cross-section concave fixing is made of a rigid body such as press pod, glass fiber, porcelain, epoxy resin, polypropylene resin, polyethylene resin, phenol resin, etc. The tool 16 is brought into contact.

In this case, the sealing plate 12 and the insulating concave cross-section fixture 16
A silicone rubber ring 1 as shown in Fig. 4 is placed between the tsuba 13 of the
Place 7.

Thus, the lead wires 18a are fixed to the external terminals 11a and llb while the silicone rubber ring 17 is pressed.
, 18b are connected to the lead wire fixing portions 15a, 15b and the capacitor element 19, the capacitor element 19 is housed in a case 20, and the opening of the case 20 is sealed tightly.

In the capacitor with a safety device configured as described above, due to various factors such as deterioration of the characteristics of the capacitor element 19, excessive rise in ambient temperature, or application of overvoltage, gas eventually fills and the internal pressure increases, but the case 20 is round. Due to the shape, the impregnating agent inflow and exhaust holes 14a and 1 are swollen.
4b, 14C, . . . , the internal pressure is concentrated within the insulating fixture 16 having a concave cross section.

A collar 1 constituting a sealing plate 12 and an insulating fixture 16 with a concave cross section
Since the silicone rubber ring 17 is placed in a pressed state between the sealing plates 12 and 3, internal pressure does not leak from this part, so the internal pressure concentrated in the insulating concave cross-section fixture 16 is concentrated at the center of the sealing plate 12. , and the sealing plate 12 swells, causing the external terminals 11a, llb and the insulating fixture 1 with a concave cross section to swell.
The lead wires 18a and 18b disposed between the lead wire fixing parts 15a and 15b constituting the lead wire fixing portions 15a and 15b of the capacitor element 19 and the external terminals 11a and llb are cut off because they cannot withstand the solenoid force, and the capacitor element 19 and the external terminals 11a and llb are electrically cut off. This opens the circuit and reliably prevents the explosion of the capacitor and burnout of attached equipment and parts.

In addition, even if the once swollen sealing plate 12 accidentally returns to its original size due to the temperature of the capacitor becoming normal, the pressing state of the silicone rubber ring 17 is released by cutting the lead wires 18a and 18b, and the lead wire returns to its original shape. 18a.

The distance between both ends of the cut section 18b can be maintained longer by that amount,
This has the advantage that there is no risk of the cut ends of the cut lead wires 18a, 18b coming into contact again.

In the above embodiments, the outer circumferential shape of the insulating concave cross-section fixing device was described as being circular, but it is not limited to this, and may be square, for example, but in that case, the shape of the silicone rubber ring Needless to say, this is naturally determined by the outer circumferential shape of the insulating fixture, which has a concave cross section.

As described above, according to the present invention, a silicone rubber ring is disposed between the sealing plate to which the external terminal is fixed and the insulating concave cross-section fixture, and the lead wire fixed to the external terminal is connected to the silicone rubber ring. When the ring is pressed, it is fixed to the lead wire fixing part formed on the insulating concave cross-sectional fixing device by electrically contacting the lead wire fixing part and the capacitor element. It is possible to reliably cut the lead wire connecting the fixed part, and also to obtain an extremely safe capacitor with a safety device in which the silicone rubber ring prevents the cut lead wire from coming into contact again.

[Brief explanation of the drawings] Figure 1 is a sectional view showing a conventional capacitor with a safety device;
Figures 2 to 4 relate to one embodiment of the present invention; Figure 2 is a sectional view showing a capacitor with a safety device; Figure 3 is a concave fixing device with an insulating cross section constituting Figure 2; A is a side view; 4 is a sectional view, B is a plan view, FIG. 4 shows the silicone rubber ring constituting FIG. 2, A is a side sectional view, and B is a plan view. 11a, llb...Lead wire, 12...
・Sealing plate, 13-■ Tsuba, 14 a, 14 b,
14 c... curved impregnating agent inlet and exhaust hole, 15a, 15b
......Lead wire fixing part, 16...Insulating concave cross-section fixing device, 17...Silicone rubber ring, 18a, 18b...Stead wire, 19...Capacitor element, 20...Case

Claims (1)

[Scope of utility model registration request] An insulator consisting of a sealing plate with an external terminal to which a lead wire is connected fixedly attached to the lower part, and a flange, a lead wire fixing part, and an impregnating agent inlet and exhaust hole formed around the back of the sealing plate. A fixing device having a concave cross section, a silicone rubber ring disposed between the sealing plate and the collar, a capacitor element disposed under the concave cross section fixing device, and a case for storing the capacitor element. , the lead wire is fixed under tension between the fixing part and the external terminal while the fixing member having a concave cross section is pressed against a silicone rubber ring, and the lead wire fixing part and the capacitor element are electrically connected. Capacitor with safety device.