KR101057630B1 - Round shape capacitor - Google Patents

Abstract

PURPOSE: A round shape capacitor is provided to simplify assembly by installing a terminal in a plastic injection mold body and inserting a cover into the plastic cover and removing an assembly process using a conventional metal cover. CONSTITUTION: A round shape capacitor is comprised of a case(10), a cover(20), terminals, a fuse embedded condenser element, and a resin molding unit. The case and cover are formed through plastic injection. The case is arranged in the bottom of a receiving plate and form a resin mold by filling a liquid resin into the case.

Description

Round Capacitor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical capacitor, and more particularly, to a cylindrical capacitor having an improved structure capable of improving assembly performance and reducing manufacturing costs.

1 is a cross-sectional view of a conventional cylindrical capacitor, and FIG. 2 is a view for explaining a state in which a safety device is operated in the cylindrical capacitor of FIG. 1.

As shown in the drawing, the conventional cylindrical capacitor includes a metal case 2 in which the capacitor element 1 is housed, a metal cover 3 which is hermetically coupled to the top of the metal case 2 by seaming, and A pair of insulated bushings 4 and 4 'coupled to and insulated through the metal cover 3, terminals 5 and 5' coupled to respective insulated bushings 4 and 4 ', and (5) (5 ') and spot welding are connected to each other through the insulating bushing (4) (4') to project to the lower side of the metal cover (3) and the projection (6a) (6a ') at the end Formed rivets 6, 6 ', bridges 7 in which the rivets 6, 6' are fitted such that the projections 6a, 6a 'protrude downward, the metal cover 3 and the rivets 6 (8) and a pair of rivets (6) and (6 ') are provided at the end of a pair of rivets (6) and (6') to insulate between the plates (6 ') and at the same time provide a seal for preventing leakage of insulating oil to be described later. To both ends of the press board 9 and the condenser element 1, Lead plates (L) (L ') which are spot welded to the projections (6a) and (6a'), and an insulating cup (C) for separating the capacitor element (1) from the inner circumferential surface of the metal case (2); Filled in the insulating cup (C) and contains an insulating oil (L) containing a certain amount of microwax. Here, the rivets 6, 6 'are sandwiched in the holes 7a formed in the bridge 7, but the projections 6a, 6a' protrude below the bridge 7, and the lead plates L (L). Is spot-welded to the projections 6a and 6a to perform a function as a safety device.

With this structure, when the pressure rises inside the metal case 2 due to gas generation or vapor pressure in the condenser, for example, gas is generated or overloaded due to breakdown or failure of an insulating state or electrical spark. When the vapor pressure of the insulating oil rises due to an increase in the internal temperature of the metal case 2, as shown in FIG. 2, as the metal cover 3 swells, the insulating bushings 4 and 4 ′ are raised. The projections 6a and 6a 'of the rivets 6 and 6' fixed to the insulating bushings 4 and 4 'escape from the holes 7a of the bridge 7 and thus lead plate L ( L ') is separated from the projections 6a and 6a' to block the flow of current.

However, in the case of the capacitor with the above safety device, there were the following problems.

(a) Insulating bushings (4) (4 '), terminals (5) (5'), rivets (6) (6 '), bridges (7), packings (8), pressboards (3) 9) The process of assembling the lamp is complicated and many process steps have become a major factor in the cost increase.

(b) Since the metal cover 3 and the metal case 2 are joined by seaming, there is a risk of electrical quality accidents due to leakage of insulating oil when seaming is incomplete, and also the insulating oil that comes out of the capacitor Contamination raises fear of secondary damage.

(c) If the material of the metal cover (3) is iron-plated iron, rust occurred during long-term use, which damages the sealing and reliability of the insulating oil.

(d) When the outer diameter of the metal case 2 is less than 40 mm, since the surface area of the metal cover 3 is narrow, the swelling of the metal cover 3 is small during the operation of the safety device. As a result, secondary circuit damage occurred. For this reason, even when the capacitance of the capacitor is small, the outer diameter of the metal case (2) had to be used more than 40mm, which caused a rise in manufacturing cost.

(e) When the moisture contained in the insulating oil could not be sufficiently removed, the metal deposition film of the film used as the dielectric was oxidized by the water to damage the reliability.

(f) Since the case is made of metal, defects due to crushing in case of accidental drop during the manufacturing process occurred.

(h) When the arc is not completely separated from the lead plates L and L 'from the projections 6a and 6a', or the gas pressure inside the metal case is excessively high, the cylindrical capacitor explodes and the surrounding circuit It was also damaged.

The present invention was created to solve the above problems, and an object of the present invention is to provide a cylindrical capacitor that can simplify the assembly process and lower the manufacturing cost by changing and improving the overall configuration.

Another object of the present invention is to provide a cylindrical capacitor which essentially prevents the possibility of explosion by the pressure of gas.

An object of the present invention is to provide a cylindrical capacitor that can be implemented in various sizes to improve the versatility.

In order to achieve the above object, the cylindrical capacitor according to the present invention is made of a plastic injection molding, the first inner circumferential surface 10a, the first inner diameter (D1) is formed, the first inner circumferential surface (10a) and step ( 11) a second inner circumferential surface 10b having a second inner diameter D2 smaller than the first inner diameter D1 and connected to each other and formed on the first inner circumferential surface 10a, the first inner diameter D1 being connected to each other. A case 10 having an inner circumferential groove 12 having a larger groove inner diameter D3); It is made of a plastic injection molding, the body 21 having a bar shape as a whole and the circumferential step 22 formed at both edges of the body 21 and coupled to the inner circumferential groove 12. A cover 20; Terminals 30 and 30 'installed on the body 21; A built-in fuse type capacitor 40 having a plurality of divided deposition films and a fuse deposition film formed therein as the case 10; And a resin molding part (not shown) filled in the case 10 so that the capacitor device 40 is embedded therein.
The case 10 is formed on the second inner circumferential surface 10b and has an inner circumferential plane 13 formed with an extension step 13a forming the same plane as the step 11, and the inner circumferential groove 12 partially. It is characterized in that it comprises a non-inner circumferential groove (14) forming a path through which the circumferential step (22) exits. .

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In the present invention, it further comprises an inclined surface 15 formed on the upper end of the case 10.

In the present invention, it further comprises a bottom jaw 16 protruding from the bottom surface of the case 10.

In the present invention, it further comprises a screw 17 formed on the bottom of the case 10.

In the present invention, it further includes a bushing 23, 23 'formed on the body 21 through which the terminals 30, 30' are respectively penetrated.

In the present invention, the cover 20 is formed in the body 21, the insulating partitions 24, 25, 25 'to further separate between the terminal 30 and the other terminal 30' is further added. Include. In this case, the cover 20 further includes a pair of grooves 26 formed in the body 21 between the terminal 30 and the other terminal 30 '.

In the present invention, the condenser element 40 includes a plurality of divided deposition films 41a formed on the first film substrate, an electrode deposition film 41b formed at one edge thereof, each of the divided deposition films 41a, and the electrode deposition film ( A first film 41 having a fuse deposition film 41c formed therebetween; And a second film 42 having a deposition film formed at a portion except one edge of the second film substrate.

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According to the present invention, since the assembly is made by installing the terminal in the body, which is a plastic injection molding, and fitting the cover to the plastic case, assembling an insulating bushing terminal, rivets, bridges, packings, press boards, etc. in a metal cover, as compared to a conventional capacitor The process can be eliminated, which greatly simplifies the assembly, thereby reducing the cost.

In addition, since the inside of the case is molded with a resin, the seaming process performed when the insulating oil is used can be omitted, thereby improving the assemblability and in the case of poor seaming, the sealing oil leaked into the gap is poor. Essentially eliminated. Furthermore, in the case of using the conventional insulating oil, it is possible to prevent oxidation of the metal deposition film, which may be generated by not removing moisture sufficiently.

In addition, since the case and the cover are made of plastic injection molding, no rust occurs even if used for a long time, and even if the case or the cover is accidentally dropped during the manufacturing process, the occurrence of defects due to the dent can be prevented.

In addition, since the safety function is made by a deposition film having a fuse function, unlike the conventional cylindrical capacitor, the outer diameter of the metal case can be realized to less than 40 mm. Therefore, when the capacitance is small, the outer diameter of the metal case can be reduced, thereby further reducing the manufacturing cost. In other words, it can be implemented in various sizes to improve the versatility.

In addition, by adopting a condenser element with its own fuse function, an arc does not occur even if insulation breakdown occurs due to external factors, and thus the possibility of a high gas pressure can be fundamentally prevented, thereby eliminating the risk of explosion.

1 is a cross-sectional view of a conventional cylindrical capacitor,
2 is a view for explaining a state in which the safety device is operated in the cylindrical capacitor of FIG.
3 is an exploded perspective view of a cylindrical capacitor according to the present invention;
FIG. 4A is a cross-sectional view illustrating the case of FIG. 3, FIG. 4B is a cross-sectional view showing the case of FIG. 4A rotated in a 90 degree direction, FIG. 4C is a front view of the case of FIG. 4A, and FIG. 4D is a view of the case. Drawing for explaining that the screw is formed on the bottom,
5A is a side view of the cover employed in FIG. 3, FIG. 5B is a front view of the cover of FIG. 5A,
6 is a side cross-sectional view of a cover without a bushing in the cover employed in FIG. 3;
7 is a view for explaining a capacitor device employed in FIG.
8A is an assembled cross-sectional view of the cylindrical capacitor of FIG. 3, and FIG. 8B is an assembled cross-sectional view of the cylindrical capacitor shown in FIG. 8A rotated by 90 degrees.

Hereinafter, a cylindrical capacitor according to the present invention will be described with reference to the accompanying drawings.

Figure 3 is an exploded perspective view of the cylindrical capacitor according to the present invention, Figure 4a is a cross-sectional view taken from the case of Figure 3, Figure 4b is a cross-sectional view shown by rotating the case of Figure 4a in a 90 degree direction, Figure 4c 4A is a front view of the case of FIG. 4A, and FIG. 4D is a view for explaining that a screw is formed at the bottom of the case.

As shown, the cylindrical condenser according to the present invention includes a case 10 made of a plastic injection molding, a cover 20 made of a plastic injection molding as coupled to the case 10, and a terminal installed on the cover 20 ( 30) (30 '), a fuse-embedded condenser element 40 having a film having a plurality of divided deposition films and a fuse deposition film, which are embedded in the case 10, and the case 10 so that the condenser element 40 is incorporated. It includes a resin molding portion (not shown) to be filled.

As shown in FIGS. 3 and 4A, 4B, and 4C, the case 10 includes a first inner circumferential surface 10a, a first inner circumferential surface 10a, and a step 11 formed with a first inner diameter D1. The second inner circumferential surface 10b having a second inner diameter D2 smaller than the first inner diameter D1 and connected to each other and formed in the first inner circumferential surface 10a and having a groove inner diameter larger than the first inner diameter D1 ( An inner circumferential groove 13 having a D3), an inner circumferential flat portion 13 formed on the second inner circumferential surface 10b, and having an extension step 13a that forms the same surface as the step 11, and a partial inner circumferential groove is formed. Non-inner circumferential groove 14, the inclined surface 15 formed on the upper end of the case 10, and the bottom jaw 16 protruding from the bottom surface of the case 10.

The case 10 has a cylindrical shape as a whole, and its inner circumferential surface is composed of a first inner circumferential surface 10a and a second inner circumferential surface 10b. At this time, the second inner diameter D2 of the second inner circumferential surface 10b is smaller than the first inner diameter D1 of the first inner circumferential surface 10a, and thus, between the first inner circumferential surface 10a and the second inner circumferential surface 10b. Step 11 is formed. This step 11 is worn over the body 21 of the cover 20 to be described later.

The inner circumferential groove 12 has a groove inner diameter D3 larger than the second inner diameter D1 and is formed on the first inner circumferential surface 10a. The inner circumferential groove 12 is coupled to the circumferential step 22 of the cover 20 which will be described later.

The non-inner groove 14 is formed on the first inner circumferential surface 10a and means a region in which the inner circumferential groove 12 is not partially formed, and the circumferential step 22 of the cover 20 to be described later is the non-inner groove 14. ) Form a path through which to exit. That is, when the circumferential step 22 of the cover 20 is positioned in the inner circumferential groove 12 and then rotates the cover 20 to position the circumferential step 22 in the non-inner circumferential groove 14, the circumferential step 22. The cover 20 may eventually be separated from the case 10 because the non-inner groove 14 is pulled out. By forming such a non-circumferential groove 14, when an unintended situation occurs during the assembly process and the cover 20 needs to be separated from the case 10, the cover 20 can be easily removed from the case 10. It can be separated.

The non-inner circumferential groove 14 is formed at a position corresponding to the extension step 13a of the inner circumferential plane portion 13. Accordingly, when the cover 20 is rotated so that the circumferential step 22 is positioned at the extension step 13a of the inner circumferential plane portion, the cover 20 may be separated from the case 10 through the non-inner circumferential groove 14.

The inclined surface 15 allows the cover 20 to be easily coupled to the case 10 by acting as a guide so that the body 21 can ride down when the cover 20 to be described later is pressed from the top.

The bottom jaw 16 prevents the liquid resin from adhering to the bottom of the receiving plate by the liquid resin when the resin flows into the case 10 in the process of forming the resin molding part.

The case 10 fills the liquid resin in the case 10 while being placed on the bottom of the storage plate (not shown) to form a resin molding part. In this process, the liquid resin may flow along the outer wall of the case 10. . At this time, the bottom jaw 13 separates the bottom surface of the case 10 from the bottom of the storage plate, so that even if the flowed down liquid resin penetrates between the case 10 and the bottom of the storage plate, the bottom surface of the case 10 is the bottom of the storage plate. The state spaced apart from the body can be maintained, and thus the case 10 can be easily separated from the bottom of the storage plate.

Meanwhile, as shown in FIG. 4D, a screw 17 may be formed at the bottom of the case 10. The screw 17 is for screwing and fixing the case 10 to a screw groove (not shown) formed in a specific object, and thus the condenser can be easily installed on the specific object.

FIG. 5A is a side view of the cover employed in FIG. 3, FIG. 5B is a front view of the cover of FIG. 5A, and FIG. 6 is a side cross-sectional view of the cover having no bushing formed in the cover employed in FIG. 3.

The cover 20 has a bar shape as a whole covering the step 11, and is formed at both edges of the body 21 and the ends of the body 21, through which the terminals 30 and 30 'are installed. The circumferential step 22 coupled to the groove 12, the bushings 23 and 23 ′ through which the terminals 30 and 30 ′ are respectively formed, and formed in the upper portion of the body 21, and to the body 21. As formed, the insulating partition walls 24 and 25 separating the terminal 30 and the other terminal 30 'and the V-shape formed in the body 21 between the terminal 30 and the other terminal 30' are formed. It includes a pair of grooves 26.

The body 21 is made of plastic injection molding and is generally in the form of a bar. As the body 21 has a bar shape, when the body 21 is coupled to the case 10, a space through which the liquid resin can be introduced is formed between the case 10 and the body 21. In this case, the bar-shaped body 21 may have an arm (not shown) extending from the center to the left and right sides to form a cross shape as a whole.

The circumferential step 22 is formed to protrude at the edge of the body 21 and has the same circumferential surface as the inner circumferential surface of the case 10. When the circumferential step 22 is fitted into the inner circumferential groove 12 of the case 10, the cover 20 maintains the state coupled to the case 10.

The bushings 23 and 23 'firmly fix the terminals 30 and 30', and can be implemented in various shapes such as a cylindrical shape or a bowl cylindrical shape. Two bushings are exemplified in the present embodiment, but three may be formed.

The insulating partition wall 24 is formed between the terminal 30 and the other terminal 30 'and has a length greater than the legs 30a and 30a' of the terminals 30 and 30 'extending to the lower side of the cover 20. Has The insulating barrier rib 24 prevents the terminals 30 and 30 'from coming into contact with the electrode end 40a of the capacitor element, which will be described later, so as not to be electrically shorted. The insulating partition 24 also separates between the terminal 30 and the other terminal 30 ', thereby preventing the wires separated from the particular terminal from contacting the other terminal in unintended circumstances.

This insulating partition 24 is formed between the legs 30a and 30a 'of the lower terminal of the body 21, but if necessary, the bushing 23 and the other bushing 23' on the upper side of the body 21. It may be formed between).

Meanwhile, as shown in FIG. 6, the cover 20 may not employ the bushings of FIGS. 5A and 5B. In this case, insulating partitions 25 and 25 'are formed on the upper and / or lower side of the body 21 of the cover 20' to separate the terminal 30 and the other terminal 30 '.

The groove portion 26 has a shape immersed in both sides of the body 21, thereby improving the spreadability of the resin when filling the case 10 with the liquid resin to improve workability.

Terminals 30 and 30 'are made of tin coated steel or tin plated brass. At this time, the lower end of the terminal 30, 30 'is given an inclined surface so that it can be easily fitted into the terminal groove formed in the body (21).

By the structure described above, when the cover 20 is placed on the upper portion of the case 10 and pressed, the circumferential step 22 is coupled to the inner circumferential groove 12 of the case. In this state, the cover 20 remains firmly coupled to the case 10. In addition, when the cover 20 is to be separated from the case 10, the cover 20 may be rotated to position the circumferential step 22 in the non-inner circumferential groove 14 and then be pulled out to separate it from the case 10. have.

FIG. 7 is a view for explaining a capacitor device employed in FIG. 3.

As shown, the condenser element 40 is a fuse-embedded condenser element having a film in which a plurality of split deposition films and a fuse deposition film are formed. As one example of such a condenser element 40, as shown in FIG. 8, a plurality of split deposition films 41a formed on the first film substrate, an electrode deposition film 41b formed on one side edge, and each of the split deposition films 41a, respectively. ) And a first film 41 having a fuse deposition film 41c formed between the electrode deposition film 41b; And a second film 42 having a deposition film formed at a portion except one edge of the second film substrate.

At this time, the first film 41 and the second film 42 are overlapped with each other to form a roll shape, so that the electrode end 40a is formed on one side and the other side, and the electrode end 40a is formed by spraying a known metal. The positive electrode terminal 30a is connected to the terminals 30 and 30 'by the insulating coating lines W1 and W2.

With this structure, in the capacitor element 40, when an electrical spark phenomenon or an overload is applied therein, and the dielectric breakdown occurs, the fuse deposition film 41c between the split deposition film 41a and the electrode deposition film 41b is separated from the current. To block the flow of.

The resin molding part is filled with a liquid resin, preferably an epoxy resin in the case 10, and placed in a furnace in a heated environment for a predetermined time to cure the epoxy resin to fix the condenser element 40 to a position. Very hard resin molding is completed.

Although the condenser element 40 is illustrated in a cylindrical shape in the drawing, it may be realized in a flat form.

Next, the manufacturing method for manufacturing the cylindrical capacitor of this invention is demonstrated.

FIG. 8A is an assembled cross-sectional view of the cylindrical capacitor of FIG. 3, and FIG. 8B is an assembled cross-sectional view of the cylindrical capacitor shown in FIG. 8A rotated by 90 degrees.

First, in order to manufacture the cylindrical capacitor of the present invention, a step (S1) of clamping the terminals 30 and 30 'is inserted into the terminal groove formed in the body 21.

Next, the step S2 of connecting the terminal legs 30a and 30 'extending below the body 21 and the positive electrode terminal 30a of the capacitor element 40 to the insulation coating line W1 and W2 is shown. To perform.

Next, the capacitor element 40 is placed in the case 10, and then the cover 20 is placed on the upper portion of the case 10, and then the circumferential step 22 is pressed into the inner circumferential groove 12 of the case 10. Inserting step (S3) is performed.

next. Filling the liquid resin into the space formed between the cover 20 and the case 10 (S4) is performed.

Then, the case 10 filled with the liquid resin is placed in the heated furnace for a predetermined time to perform the step of curing the resin (S5). By this series of steps, the cylindrical capacitor of the present invention as shown in Figs. 8A and 8B is completed.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

10 ... Case 10a ... First inner circumference
10b ... 2nd inner peripheral surface 11 ... step
12 ... Inner groove 13 ... Inner plane
13a ... extension step 14 ... non-inner groove
15 ... slopes 16 ... floor jaws
20 ... cover 21 ... body
22 ... circumferential step 23, 23 '... bushing
24, 25 ... insulation bulkhead 26 ... groove
30, 30 '... terminal 30a, 30a' ... leg
40 ... Capacitor element 41 ... First film
41a ... Split film 41b ... Electrode film
41c ... fuse film 42 ... second film

Claims (10)

Made of plastic injection molding, the first inner diameter (D1) is formed of the first inner circumferential surface (10a), and the first inner circumferential surface (10a) and the step forming a step 11, the first smaller than the first inner diameter (D1) 2 has a second inner circumferential surface 10b having an inner diameter D2 and an inner circumferential groove 12 formed on the first inner circumferential surface 10a and having a groove inner diameter D3 larger than the first inner diameter D1. Case 10;
It is made of a plastic injection molding, the body 21 having a bar shape as a whole and the circumferential step 22 formed at both edges of the body 21 and coupled to the inner circumferential groove 12. A cover 20;
Terminals 30 and 30 'installed on the body 21;
A built-in fuse type capacitor 40 having a plurality of divided deposition films and a fuse deposition film formed therein as the case 10; And
And a resin molding part (not shown) filled in the case 10 so that the capacitor device 40 is embedded therein.
The case 10 is formed on the second inner circumferential surface 10b and has an inner circumferential plane 13 formed with an extension step 13a forming the same plane as the step 11, and the inner circumferential groove 12 partially. It is not formed so that the circumferential step (22) further comprises a non-inner circumferential groove (14) to form a path through which the cylindrical capacitor. delete The method of claim 1,
Tubular capacitor, characterized in that it further comprises an inclined surface (15) formed on the top of the case (10). The method of claim 1,
Tubular condenser, characterized in that it further comprises a bottom jaw (16) protruding from the bottom surface of the case (10). The method of claim 1,
Cylindrical capacitor, characterized in that it further comprises a screw (17) formed on the bottom of the case (10). The method of claim 1,
And a bushing (23) (23 ') through which the terminals (30) (30') are formed, respectively, formed on an upper portion of the body (21). The method of claim 1, wherein the cover 20,
A cylindrical condenser, which is formed in the body 21, further comprising an insulating partition wall 24, 25, 25 'separating the terminal 30 and the other terminal 30'. The method of claim 7, wherein the cover 20,
And a pair of grooves (26) formed in the body (21) between the terminal (30) and the other terminal (30 '). The method of claim 1, wherein the condenser element 40,
A plurality of split deposition films 41a formed on the first film substrate, an electrode deposition film 41b formed at one edge thereof, and a fuse deposition film 41c formed between each of the split deposition films 41a and the electrode deposition film 41b. 1 film 41; And
And a second film (42) having a deposition film formed at a portion except one edge of the second film substrate. delete

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