JP3160950B2 - Vacuum condenser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum capacitor used for an oscillation circuit and an amplification circuit of a high power transmitter, a tank circuit of an induction heating device, and the like.

[0002]

2. Description of the Related Art High voltage and current ratings, tuning ratios,
In recent years, vacuum capacitors have been used for large power capacitors because of their excellent self-healing properties.

FIG. 2 is a sectional view of a conventional general vacuum capacitor. Referring to FIG. 2, the structure of this type of vacuum capacitor will be briefly described. One end (fixed end) of an insulating cylindrical member 21 made of ceramic or glass is closed by a bottom metal disk member 22 and the other end (variable). End) is a metal cylindrical member 2
A vacuum container case 20 for filling a high-proof vacuum dielectric by being closed by the metal disk member 24 and the upper end metal disk member 24 is formed. A power supply terminal for supplying an external voltage is provided on each of the bottom metal disk member 22 and the top metal disk member 24.

A plurality of substantially cylindrical electrode plates having different inner diameters are provided concentrically at regular intervals on the inner wall of the bottom metal disk member 22 to form fixed electrodes 25. The movable electrode 26 is formed by providing a plurality of cylindrical electrode plates which are inserted and removed in a non-contact state between the plates.
The movable electrode 26 is attached to a movable electrode mounting conductor 28 that can move up and down along a bearing 27.

Reference numeral 29 denotes a bellows.
The upper end metal disk member 2 is moved so that the movable electrode mounting conductor 28 (movable electrode 26) can move up and down while keeping the inside airtight.
4 is fixed at one end to the inner wall, and the other end is fixed to the back surface of the movable electrode mounting conductor 28. This bellows 2
Reference numeral 9 also serves as a current path for conducting between the power supply terminal on the upper end metal disk member 24 side and the movable electrode 25.

Reference numeral 30 denotes a movable electrode mounting conductor 28 (movable electrode 2).
This is a position adjusting device for vertically moving 6).
The position adjusting device 30 includes a capacitance adjusting screw 30a for adjusting the vertical position of the movable electrode mounting conductor 28, a rotating head 30b supporting the screw 30a, and a movable lead 30c for driving the movable electrode mounting conductor 28. It is composed of

When adjusting the capacitance of the vacuum capacitor having such a structure, the movable electrode mounting conductor 28 is moved up and down by rotating the capacitance adjusting screw 30a. As a result, the intersection area between the fixed electrode 25 and the movable electrode 26 changes, and the value of the capacitance changes continuously.

[0008]

By the way, a vacuum capacitor is rarely used alone. Usually, a fixed-capacity type and a variable-capacity type having the above structure are connected in series or in parallel. Is done. Furthermore, when used, it is housed in a large rack together with circuit components such as a transformer and insulating members.

In a vacuum capacitor, the fixed electrode 25
In addition, the value of the capacitance is determined by the arrangement interval and the intersection area of the movable electrodes 26, and the minimum interval between the electrodes is also determined according to the withstand voltage value.

Therefore, in order to increase the capacitance, in the conventional vacuum capacitor having the above structure, it is necessary to increase the number of the respective electrode plates constituting the fixed electrode 25 and the movable electrode 26 and to increase the arrangement interval. Yes, case
20 becomes large. For this reason, there is a problem that the shape of the storage rack is enlarged and the total cost is significantly increased due to the fact that the constituent materials of the vacuum condenser are expensive.

The present invention has been made in view of such a problem, and has as its object to provide a structure having both functions of a fixed capacitance type capacitor and a variable capacitance type capacitor and capable of achieving miniaturization and large capacity. It is to provide a vacuum capacitor.

[0012]

A vacuum capacitor according to the present invention comprises a case comprising a substantially cylindrical metal cylinder member having a bottom and a metal plate member provided at the upper end of the cylinder member via an insulating cylinder member. An annular metal wall provided between the metal cylinder member and the insulating cylinder member and protruding into the case, and a plurality of substantially cylindrical cylinders having different inner diameters on the inner wall of the metal plate member. A plurality of substantially cylindrical electrodes that are provided concentrically to form a first fixed electrode and that are intersected between the electrode plates of the first fixed electrode while maintaining a predetermined distance from each electrode plate. A plate is provided on the wall to form a second fixed electrode,
Furthermore, a plurality of substantially cylindrical electrode plates having different inner diameters are provided concentrically on the bottom inner wall of the case to form a third fixed electrode, and each electrode plate is provided between the electrode plates of the third fixed electrode. A movable electrode is formed by a plurality of substantially cylindrical electrode plates which are arranged so as to be able to be inserted and withdrawn at a predetermined interval and are each electrically connected to the metal plate member, and the outermost peripheral electrode plate surface of the movable electrode is It has a structure in which it is adjacent to and opposed to the inner wall of the side surface of the metal cylindrical member at a predetermined interval.

[0013]

The metal cylinder member and the metal plate member are insulated by the insulating cylinder member, and the metal cylinder member and the metal wall are electrically connected. Therefore, the first fixed electrode and the movable electrode, the second fixed electrode and the third fixed electrode are electrically connected to each other, but the first fixed electrode and the second fixed electrode, the third fixed electrode and the movable electrode are Each becomes insulated.

Here, when voltages of different polarities are supplied to the metal cylindrical member and the metal plate member, respectively, a fixed capacitance determined by an intersection area between the first fixed electrode and the second fixed electrode,
In addition, the variable capacitance determined by the intersection area between the third fixed electrode and the movable electrode is added to obtain a large capacitance.

Further, the side surface of the metal cylindrical member also serves as an electrode plate of the fixed electrode, and a capacitance is generated between the movable electrode and the outermost peripheral electrode plate surface. This capacitance is also added. Thereby, while having both functions of the fixed type capacitor and the variable type capacitor, the capacitance can be increased without increasing the outer diameter of the case.

[0016]

1 is a sectional view of a vacuum capacitor according to one embodiment of the present invention.

In this figure, reference numeral 10 denotes a vacuum container case. The case 10 includes a cylindrical metal member 10a having a bottomed cylindrical shape, and an insulating cylindrical member 1 provided on an upper end of the cylindrical member 10a.
0b, and a metal disc member 10c provided through the metal disc member 10c. Also, a metal cylindrical member 10a and an insulating cylindrical member 10b
An annular metal wall portion 10d protruding into the case is provided between them. 10e is a metal cylindrical member 1
0a shows the bottom.

At substantially the center of the metal disk member 10c, a bearing 11 and a movable lead 12 having the same functions as the conventional one are provided.
The movable lead 12 is moved up and down along the bearing 11 by a capacitance adjusting screw (not shown).

Further, on the inner wall of the metal disk member 10c,
One end of the bellows 13 is fixed, and a plurality of cylindrical electrode plates each having a different inner diameter are provided concentrically to form the first fixed electrode 14, and each of the first fixed electrodes 14 is provided between the electrode plates. The second fixed electrode 15 is formed by providing a plurality of cylindrical electrode plates cross-inserted at a predetermined interval with the electrode plate on the wall 10d.

On the other hand, a plurality of cylindrical electrode plates having different inner diameters are provided concentrically on the inner wall of the case bottom 10e to form the third fixed electrode 16, and the third fixed electrode 16 is provided between the electrode plates. The movable electrode 17 is formed by a plurality of cylindrical electrode plates which are inserted into and removed from each of the electrode plates at a predetermined interval. The movable electrode 17 has the movable lead 1
2 and the other end of the bellows 13 are fixed to the surface of the movable electrode mounting conductor 18 to which the outermost electrode plate surface is adjacent and opposed to the side surface of the metal cylindrical member 10a at a predetermined interval.

In the vacuum capacitor of this embodiment having the above structure, the metal cylindrical member 10a and the metal disk member 10c are insulated by the insulating cylindrical member 10b,
0a and the metal wall portion 10d conduct. Therefore, the first fixed electrode 14 and the movable electrode 17 and the second fixed electrode 15
The first fixed electrode 14 and the second fixed electrode 15 are insulated from each other, while the third fixed electrode 16 and the movable electrode 17 are insulated from each other. Further, in relation to the outermost electrode plate of the movable electrode 17, the side surface of the metal cylindrical member also functions as a fixed electrode plate.

Here, when voltages of different polarities are supplied to the metal cylinder member and the metal disk member via a power supply terminal (not shown), the first fixed electrode and the second fixed electrode are connected to each other. A large capacitance can be obtained by adding the fixed capacitance determined by the cross area and the variable capacitance determined by the cross area between the third fixed electrode and the movable electrode.

Further, the capacitance generated between the movable electrode 14 and the surface of the outermost electrode plate is further added up. As a result, the functions of the fixed capacitor and the variable capacitor can be shared, and the capacitance can be increased without increasing the outer diameter of the case.

In this embodiment, the metal cylindrical member 10a which is a part of the case 10 is used as an electrode plate as it is. However, only the inner wall of the side surface is used as the second and third fixed electrodes. It may be formed of a conductive member that conducts with the conductors 15 and 16, and the outer wall thereof may be covered with an insulating member.

The description has been given on the assumption that the electrode plates of the fixed electrodes 14, 15, 16 and the movable electrode 17, and the metal cylindrical member 10a and the insulating cylindrical member 10b are circular in cross section. May be a cylindrical one, and its cross-sectional shape does not necessarily have to be a perfect circle. The shape of the metal plate member 10c is also determined according to these tubular members.

[0026]

As described above, according to the present invention, a vacuum vessel case is formed by a substantially cylindrical metal cylinder member with a bottom and a metal plate member provided via an insulating cylinder member. An annular metal wall portion protrudes into the case between the metal cylinder member and the insulating cylinder member, and first and second fixed electrodes are provided crossing each other on the wall portion and the metal plate member, and Since a third fixed electrode is provided at the bottom of the metal tubular member, and a movable electrode that is electrically connected to the metal plate member is disposed between the electrode plates of the third fixed electrode so as to be insertable and insertable. A space can be effectively used, a large capacitance can be obtained without increasing the outer diameter, and the functions of a fixed capacitor and a variable capacitor can be combined.

Further, since the outermost electrode plate surface of the movable electrode is adjacent to and opposed to the inner wall of the side surface of the metal cylindrical member at a predetermined interval, the metal cylindrical member also functions as an electrode plate of the fixed electrode. Further, the capacitance can be increased.

Therefore, according to the present invention, it is possible to realize a vacuum condenser capable of achieving a reduction in size and an increase in capacity, and a reduction in the size of a rack accommodating the vacuum condenser and a reduction in total cost can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional structural view of a vacuum capacitor according to one embodiment of the present invention.

FIG. 2 is a sectional structural view of a conventional general vacuum capacitor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Case, 10a ... Metal cylindrical member, 10b ... Insulating cylindrical member, 10c ... Metal disk member, 14, 15, 16
... fixed electrode, 17 ... movable electrode.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-201611 (JP, A) JP-A-55-111335 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01G 5/00-5/40

Claims (1)

(57) [Claims] A movable container is provided in a cylindrical vacuum vessel.
A movable electrode movably provided through a
Vacuum capacitor with fixed electrode implanted in conductor
Wherein the movable electrode and the fixed electrode each have an inner diameter.
A plurality of different substantially cylindrical electrode plates are spaced apart from each other by a predetermined distance.
And the outermost electrode plate of the movable electrode is opposed to the vacuum vessel.
And an insulating cylindrical member on the movable lead side of the vacuum vessel.
Intervene and insert the inner diameter
Having a wall portion bent in the direction of
The movable electrode is formed by forming a vacuum container with the conductive members
And the vacuum vessel portion and the fixed electrode
It is formed in a conductive state, and the movable lead insertion side vacuum
The inner diameter differs between the metal plate member of the container and the wall.
Are connected to each other around a movable lead.
A vacuum capacitor characterized in that it is disposed opposite to each other at a predetermined interval .