JPS6320114Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a capacitor with an improved cooling structure.

[Technical background of the invention] Since the operating capacity (KVA) of a capacitor is proportional to its operating frequency, high-frequency capacitors used for improving the power factor of high-frequency electric furnaces using high-frequency induction heating, etc. Compared to capacitors used in frequency circuits, the operating capacity per unit volume is larger, and at the same time, the heat loss generated per unit volume is also larger. For this reason, high-frequency capacitors generally have a water-cooled tube in contact with the aluminum foil for the electrode to suppress the rise in temperature of the dielectric.

That is, as shown in FIG. 1, in a conventional high-frequency water-cooled capacitor, a capacitor element 1 is made by alternately stacking two sheet-like dielectrics 2a, 2b and two electrode aluminum foils 3a, 3b. It is formed by winding it into a cloth shape. One of the electrode aluminum foils 3a in the capacitor element 1 is wide and has a certain width exposed on one side of the sheet dielectrics 2a, 2b in the width direction to form an ear portion 4. After the capacitor element 1 is wound, the ears 4 are stacked in layers and gathered together, sandwiched between two plate-shaped connecting members 5 made of copper or brass, and formed into spot welds, eyelets 6, etc. They are each compressed and fixed. Note that the reason for using the connecting member 5 at this time is to facilitate the work of soldering a water-cooled pipe that also serves as a low-pressure side lead, which will be described later.

On the other hand, one lead terminal 7 is inserted between the other electrode aluminum foil 3b and the sheet dielectric 2a so as to be electrically connected to the electrode aluminum foil 3b. At the exposed end of this lead terminal 7,
The high voltage side lead is connected after the capacitor element is wound.

Next, in order to obtain the necessary capacitance, as shown in FIG. 2, a plurality of the above capacitor elements 1 are integrated to form a capacitor body 8. That is, each capacitor element 1 is arranged so that the connecting member 5 provided on one side thereof is on the same side, and a plurality of capacitor elements 1 are integrated in the direction of the wound thickness. An insulating member 9 and a tightening plate 10 are applied to both sides of the integrated capacitor elements 1 in the direction of integration, respectively, and the whole is tightened and fixed using a tightening band 11. On the capacitor element body 8 formed in this manner, the connecting members 5 are laid down horizontally on the surface of the capacitor element body 8, and then, as shown in FIG. Place the shaped water cooling pipe 12 and solder the two so that they are integrated. Thereafter, the capacitor body 8 is housed in the case 13, and the water cooling pipe 1 is
The inlet and outlet of 2 are made to protrude outside the case 13 to serve as low voltage side terminals. Further, a low voltage side lead 14 is connected to each connecting member 5, and these low voltage side leads 14 are gathered together and connected to the lower ends of separate low voltage side terminals 15 protruding above the case 13.

On the other hand, on the back side of the capacitor body 8, the high voltage side lead 1 made of a normal conductor is connected to the lead terminal 7.
6 and connect this high voltage side lead 16 to the case 13.
The high voltage side terminal 1 is made to protrude through the bushing.
Connect to the bottom end of 7. Thereafter, insulating oil 18 is sealed in case 13 in a vacuum state to form a water-cooled capacitor.

[Problems with the Background Art] Generally speaking, capacitor equipment for improving the power factor of a high-frequency electric furnace requires a large number of capacitors of several 100 KVA class. Therefore, the piping system becomes more complicated than other equipment with a small number of condensers, and the pump equipment also becomes larger due to the increased flow resistance of the cooling water due to the meandering water cooling pipe 12, which ultimately results in the capacitor equipment becoming larger. I had a problem.

Furthermore, in addition to the above-mentioned problem of increasing the size of the water cooling equipment, the water cooling pipe 12, which serves as the low voltage side terminal, can only have two inlets and two exits outside the case 13, and the current capacity is limited with only the water cooling pipe 12. Because of the shortage, a separate low-voltage side lead 14 was inevitably required.

Furthermore, since the leads are provided separately from the water-cooled pipe 12, the water-cooled pipe 12 cannot cool the heat generated by the Joule loss generated in the leads themselves due to the current flowing through them. It was hot too.

[Purpose of the invention] The purpose of the invention is to solve the above-mentioned problems, simplify the cooling equipment, secure current capacity without requiring separate leads, and reduce the Joule heat generated in the leads. The objective is to provide a condenser that can be directly cooled.

[Summary of the invention] The capacitor of this invention secures sufficient current capacity by connecting the required number of heat pipes that also serve as leads to at least one of the two electrode aluminum foils that make up the capacitor element. In addition, the structure is such that the Joule heat generated in the reed can be directly cooled using the latent heat of vaporization of the heat pipe.

[Embodiment of the invention] Hereinafter, a first embodiment of the invention will be described with reference to FIG. Note that the same parts as those of the conventional capacitor shown in FIGS. 1 to 3 are given the same numbers and the description thereof will be omitted.

In this embodiment, the water cooling pipe, low voltage side lead, and low voltage terminal used in conventional capacitors are not provided. Instead, a number of heat pipes 21 necessary to ensure current capacity are provided with their tips protruding from the top of the case 13. The lower portions of these heat pipes 21 are connected by soldering to the connection members 5 of the capacitor elements 1 in their respective areas. The lower part of this heat pipe 21 is
Depending on the number of capacitor elements 1 in the assigned range, each capacitor element 1 is bent so as to contact each connection member 5 of the capacitor element 1, and the integrated capacitor elements 1 are bent so as to contact each connection member 5 of the adjacent capacitor element 1 when the connection member 5 is laid down. They are connected in parallel by contacting the exposed aluminum foil for electrodes.

Note that when using a large number of heat pipes, it is also possible to use linear heat pipes.

A heat radiation fin 22 is attached to the tip of the heat pipe 21 so as to cool and liquefy the vaporized gas of the liquid with a low boiling point sealed inside the heat pipe, and serves as a heat radiation part of the heat pipe 21. There is. Further, in order to further enhance the heat dissipation effect, the tip of the heat pipe may be air-cooled by the fan 23. However, the heat dissipation fin 22 and the fan 23
is not necessarily necessary. Furthermore, a terminal fitting 24 is attached to the tip of the heat pipe 21 to serve as a low voltage terminal.

According to the capacitor of this embodiment having the above configuration, the liquid inside the heat pipe 21 is vaporized by the heat generated in the electrode aluminum foil and the heat pipe 21 itself, which is the lead, and rises. By being air-cooled and liquefied at the tip, similar to when using a water-cooled pipe,
Demonstrates good cooling heat effect. Furthermore, since the heat pipe 21 itself also serves as the low-pressure side lead, the lead itself is sufficiently cooled. In this case, the number of heat pipes to be attached is determined by the larger of the number determined by the heat dissipation capacity or current capacity of the heat pipes.

Next, another embodiment of the present invention will be described.

In the present embodiment described above, the heat pipe 21
The lead 16 on the high voltage side also serves as a lead on the low voltage side, and a conventional conductor is used as the lead 16 on the high voltage side, but as in the second embodiment shown in FIG. 5, a heat pipe 21 is also used on the high voltage side. The high voltage side lead can also serve as a cooling means. That is, in the capacitor element in this case, an ear portion is formed on the opposite edge of the electrode aluminum foil 3b in the same way as the electrode aluminum foil 3a. The heat pipe 21 is connected by soldering to the contact member provided on the ear part, and the heat pipe 21 through which the high voltage current flows is made to protrude to the outside of the case 13 via the bushing 25. According to this second embodiment, the capacitor body is cooled from both the front and back surfaces,
In addition to further improving the cooling effect, the heat pipe 2 which also serves as the high pressure side lead absorbs the heat generated in the high pressure side lead, which could not be cooled in the first embodiment.
1 allows direct cooling.

In addition, as in the third embodiment shown in FIG. 6A, the heat pipe 21 which also serves as the low pressure side lead is
Alternatively, it can be electrically isolated from the case 13 by passing it through the bushing 25. In this way, not only the same effect as the first embodiment can be obtained, but also the potential of the case can be set to the ground potential, so there is no need to separate the capacitor from the ground potential with a support insulator, etc. This is very advantageous when a large number of capacitors are installed. In addition, the heat pipe 21 on the low pressure side is connected to the case 13.
The structure of electrically isolating from the heat pipe can also be adopted when both the low-voltage side lead and the high-voltage side lead are heat pipes, as in the fourth embodiment shown in FIG. 6B, and the same effect can be obtained.

In the above embodiment, the heat pipe is attached to the electrode aluminum foil by soldering to the connecting member 5, but the same effect can be obtained by attaching by metal spraying. In this case, the connecting member 5 can be omitted and the heat pipe 21 can be attached directly to the protruding ear part 4 of the electrode aluminum foil, so that workability is improved, such as reducing the number of parts.

[Effects of the invention] As described above, according to the present invention, the following effects can be obtained.

(1) Cooling is performed by heat pipes, so
No water cooling equipment is required. Particularly, in capacitor equipment for power factor improvement in high-frequency electric furnaces where the piping system of water-cooled pipes is complicated, the equipment can be downsized.

(2) It is possible to provide as many heat pipes as necessary, and the current capacity as leads can be freely secured, and there is no need to provide separate leads.

(3) Since the heat pipe is used as a lead, the heat generated by the current flowing through the lead can be directly cooled, resulting in an excellent cooling effect.

(4) The cooling equipment for the capacitor will be simplified, the manufacturing workability of the capacitor equipment will be improved, and the cost will be reduced.

[Brief explanation of the drawing]

Figure 1 is a partial exploded view of a general capacitor element.
Fig. 2 is a perspective view of a capacitor body in which a plurality of capacitor elements are integrated, Fig. 3A is a cross-sectional view of a conventional water-cooled capacitor, Fig. 3B is a longitudinal sectional view of Fig. 3A, and Fig. 4 is a cross-sectional view showing a capacitor according to the first embodiment of the present invention, FIG. 5 is a longitudinal cross-sectional view showing a capacitor according to a second embodiment of the present invention, and FIGS. FIG. 4 is a vertical cross-sectional view of a capacitor according to a fourth embodiment. DESCRIPTION OF SYMBOLS 1... Capacitor element, 2a, 2b... Sheet-like dielectric material, 3a, 3b... Aluminum foil for electrodes, 4...
...Ear portion, 5... Contact member, 6... Eyelet, 7...
Lead terminal, 8... Capacitor body, 9... Insulating member, 10... Tightening plate, 11... Tightening band, 1
2...Serpentine water cooling pipe, 13...Case, 14...
...Low voltage side lead, 15...Low voltage side terminal, 16...
High voltage side lead, 17...High voltage side terminal, 18...Insulating oil, 21...Heat pipe, 22...Radiating fin, 23...Fan, 24...Terminal fitting, 25...
...Butsuthing, 26...Kanakan.

Claims (1)

[Claims for Utility Model Registration] (1) A capacitor element is formed by winding two sheets of aluminum foil for electrodes and two sheets of dielectric material that are stacked alternately in a cloth shape, and a plurality of these capacitor elements are formed. A heat pipe that also serves as a lead is connected to at least one of the two electrode aluminum foils that are integrated to form a capacitor element, and the tip of this heat pipe is connected to the capacitor element. A capacitor that protrudes outside a case in which the capacitor is housed, and the protruding portion serves as a lead terminal and a heat dissipation portion of a heat pipe. (2) The capacitor according to claim 1, wherein the heat pipe is connected only to one electrode aluminum foil and serves as a lead on the low voltage side. (3) The capacitor according to claim 1 of the utility model registration, wherein the heat pipe is connected to both electrode aluminum foils and serves as a low voltage side lead and a high voltage side lead. (4) The connection of the heat pipe to the aluminum foil for the electrode is
Scope of Utility Model Registration Claims 1, 2 or 3, in which a heat pipe is fixed by soldering to a connecting member that clamps ears formed on aluminum foil for electrodes. Capacitors listed. (5) The connection of the heat pipe to the aluminum foil for the electrode is
A capacitor according to claim 1, 2, or 3 of the utility model registration claim, which is made by metal spraying. (6) The capacitor according to claim 1, 2, or 3, wherein the heat pipe is provided with heat dissipation fins on the projecting portion to the outside of the case. (7) The capacitor according to claim 1, 2, or 3, wherein the heat pipe is electrically isolated from the case via an insulator or a bushing.