JPH07211588A - Vacuum capacitor - Google Patents

Abstract

PURPOSE:To obtain a vacuum capacitor in which the constitution of an electrode is improved, which reduces the number of production processes and whose cost are reduced. CONSTITUTION:A guide member 2 is formed in the center of an electrode mounting conductor 1. A plurality of cylindrical concentric electrode plates 3F1 to 3Fn whose diameter is different are formed to be a bottomed cylinder shape. A guide hole 3' into which the guide member 2 is fitted is formed in the bottom- part center. The guide member 2 is fitted into the guide hole 3'. The cylindrical electrode plates 3F1, to 3Fn are fixed by a fixation means such as a caulking means or the like so as not to drop, and they are brazed simultaneously by one brazing process to an electrode situated on the lower side. A setting groove by which the cylindrical electrode plates are set on the electrode mounting conductor 1 is not required.

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 in an oscillator circuit, an amplifier circuit of a high power transmitter, a tank circuit of an induction heating device, or the like, and more particularly to improvement of a mounting portion of a cylindrical electrode plate.

[0002]

2. Description of the Related Art FIG. 3 is a cross-sectional structural view of a conventional general variable vacuum capacitor. For example, copper cylindrical tubes 11a and 11b are joined to both ends of an insulating cylinder 12 made of ceramic or the like to form the same cylindrical portion. The cylindrical portion is formed and is closed by the fixed side end plate 13 and the movable side end plate 14 to form the vacuum container 10 that houses the condenser part.

Inside the fixed side end plate 13, a plurality of cylindrical electrode plates F ₁ , F ₂ ... F _n having different diameters (radii) are concentrically attached at regular intervals to form a fixed electrode 15. , In the gap between the electrode plates of the fixed electrode 15,
The movable electrode 16 is formed by providing the movable conductor 18 with a plurality of cylindrical electrode plates M ₁ , M _2, ... M _n having different inner diameters so that they can be inserted and removed in a non-contact state.

A movable lead 18 'is provided on the movable conductor 18, and the movable lead 18' is slidably supported by a bearing 17 penetrating the movable side end plate 14 to support the movable electrode 16. Move from the outside of the vacuum container in the axial direction. 19
Is a bellows, one end of which is brazed to the movable end plate 14 and the bearing 17, and the other end of which is brazed to the movable lead 18 ′ or the movable conductor 18, and the sliding portion between the bearing 17 and the movable lead 18 ′ and the bearing 17. The movable side end plate 14 is covered with a penetrating portion so that the movable lead can be moved up and down while preventing vacuum leakage.

The entire cylindrical portion of the vacuum container 10 may be formed of an insulating cylinder made of ceramic or the like. The point is that the fixed electrode and the movable electrode may be electrically insulated.

In the case of adjusting the capacitance of the vacuum capacitor thus constructed, the movable electrode and the fixed electrode are energized and the movable lead 18 'is slid to move the fixed electrode 15 and the movable electrode 16 to each other. By changing the facing area of, the value of the electrostatic capacitance generated between the electrodes 15 and 16 is continuously changed.

[0007]

The fixed electrode 15 and the movable electrode 16 of the vacuum capacitor shown in FIG.
Also, a concentric circular setting groove for setting the cylindrical electrode plate is provided on the movable side conductor 18, and the cylindrical electrode plate is set in this groove and brazed, but assembled by brazing in a vacuum furnace. In this case, since the cylindrical electrode plates F _{1 to} F _n of the fixed electrode 15 cannot be fixed to the fixed side conductor and fall,
After brazing the movable side conductor 18 and the cylindrical electrode plates M _{1 to} M _n in the state shown in the figure, the position of the vacuum container 10 is changed by 180 degrees (upside down) to make the fixed electrode side larger and the fixed side end plate. The cylindrical electrode plates F _{1 to} F _n are set on 13 and brazed.

Therefore, the brazing process is required twice,
Further, in the end plates and the conductors 13 and 18 to which the fixed side and movable side electrode plates are attached, it is necessary to grind a set groove for concentrically arranging the cylindrical electrode plates by precision machining. Therefore, there is a problem that the manufacturing cost increases.

Therefore, an object of the present invention is to solve the above-mentioned problems by eliminating the need for a set groove for setting a cylindrical electrode plate and by completing the brazing process only once.

[0010]

Means for Solving the Problems According to the present invention, a means for solving the above-mentioned problems is to install a plurality of concentric cylindrical electrode plates having different inner diameters concentrically on an electrode mounting conductor in a vacuum container. A fixed electrode formed, and a movable electrode formed by concentrically attaching to the electrode attachment conductor a plurality of cylindrical electrode plates having different inner diameters so that they can be inserted and removed in a non-contact state between the cylindrical electrode plates of the fixed electrode; In a vacuum capacitor provided with a movable lead for moving the movable electrode from the outside of the vacuum container in the axial direction of the cylindrical electrode plate, one of the fixed electrode or the movable electrode, or both cylindrical electrode plates are provided. It is formed in a cylindrical shape with a bottom, a guide hole is provided at the center of the bottom, and a guide member is provided at the center position of the cylindrical electrode plate mounting of the electrode mounting conductor, and the diameter of each cylindrical electrode plate is set to the guide member. Order to insert the guide hole fixed with fixing means, to form a vacuum capacitor brazed in a fixed state.

The fixing means is preferably by caulking or punching or screwing.

[0012]

[Operation] A guide member is provided in the approximate center of the electrode mounting conductor,
Guide holes are inserted into this guide member in the order of increasing radius of the cylindrical electrode plate, and each cylindrical electrode is fixed by fixing means such as caulking or screwing the guide member, and by a predetermined brazing process in a vacuum furnace or the like. , Is integrally attached to the guide member to form a vacuum capacitor.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

1A and 1B are explanatory views of a fixed electrode according to an embodiment of the present invention. FIG. 1A is a sectional view and FIG. 1B is a perspective view of a cylindrical electrode plate. In these drawings, reference numeral 1 denotes an electrode mounting conductor, which corresponds to the fixed side end plate 13 in FIG. 3, but may be provided separately from the end plate 13. Reference numeral 2 denotes, for example, a columnar guide member that is provided so as to protrude substantially in the center of the electrode mounting conductor 1. Reference numeral 3 denotes a cylindrical electrode plate, which is formed of a metal plate such as a thin copper plate or an aluminum plate in a cylindrical shape with a bottom, and a guide hole 3'for inserting the guide member 2 is provided at the center of the bottom portion thereof. Plurality making different the of each diameter the cylindrical electrode plate 3, and fitted with 3F ₂ ... 3F _n in descending order 3F ₁ diameter as shown in FIG. 1 (A), the guide member to the guide holes Each cylindrical electrode plate 3F is fixed by caulking the guide member 2 or a fixing means such as a punch.
Fix the bottom of _{1 to} F _n .

The brazing material set for brazing is, for example, provided with a circular brazing material setting groove 1a at the root of the guide portion 3 of the electrode mounting conductor 1, and the guide member 2 having the groove 1a. A vertical groove 2a communicating with the groove 1a is provided, and a brazing material is set in the groove 1a in advance, and then a cylindrical electrode plate is assembled, or a thin plate shape is provided between the bottoms of the cylindrical electrode plates without forming these grooves. Set and assemble the brazing material. FIG. 2 shows another embodiment of the fixing means, in which the guide member 2 is provided with a screw hole and is screwed by the screw 4. The brazing material is set in the same manner as in FIG.

The brazing work is carried out by assembling the fixed electrode side as shown in FIG. 1 or FIG. 2, and setting the brazing material on the brazing joints of the movable electrode side and the bellows as in the prior art and setting the brazing temperature in a vacuum furnace. Heat up to.

The above is the embodiment carried out on the fixed electrode side. However, since it is not necessary to provide the electrode mounting conductor with a set groove for setting a plurality of concentric circular electrode plates of different diameters, the movable electrode side It is also effective to apply to either the fixed electrode or the movable electrode, or both.

[0018]

As described above, according to the present invention, a plurality of cylindrical electrode plates having different diameters are centered by inserting the setting hole of the cylindrical electrode plate into the setting member of the electrode mounting conductor. Since it is not necessary to process the set groove for setting the cylindrical electrode plate on the mounting conductor, and since each cylindrical electrode plate can be fixed by the setting means using the guide member,
With fixed electrodes or movable electrodes, the cylindrical electrode plate of the electrode located on the upper side does not drop during assembly, and it is possible to set the brazing material on both the upper and lower electrodes and perform it in one brazing process. it can. Therefore, the manufacturing cost is significantly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an electrode according to an embodiment of the present invention. (A) Sectional drawing. (B) A perspective view of a cylindrical electrode plate.

FIG. 2 is an explanatory view of another embodiment of the electrode of the present invention.

FIG. 3 is a basic configuration diagram of a vacuum capacitor.

[Explanation of symbols]

1 ... electrode mounting conductors 2 ... guide member 3,3F ₁ ~3F _n ... cylindrical electrode plate 3 ... guide hole 4 ... Screw

Claims (3)

[Claims] 1. A fixed electrode formed by concentrically mounting a plurality of concentric cylindrical electrode plates of different diameters in an electrode mounting conductor in a vacuum container, and a non-between the cylindrical electrode plates of the fixed electrode. A movable electrode formed by concentrically attaching a plurality of cylindrical electrode plates having different diameters to an electrode mounting conductor so that the movable electrode can be inserted and removed in a contact state, and the movable electrode is provided from the outside of the vacuum container in the axial direction of the cylindrical electrode plate. In a vacuum capacitor having a movable lead to be moved to, either the fixed electrode or the movable electrode, or both cylindrical electrode plates are formed into a bottomed cylindrical shape, and a guide hole is provided at the bottom center thereof, A guide member is provided at the center position of the cylindrical electrode plate mounting of the electrode mounting conductor, the guide holes are inserted into the guide member in the order of the diameter of each cylindrical electrode plate and fixed by the fixing means, and brazed in the fixed state. Vacuum capacitor, characterized in that. 2. The vacuum capacitor according to claim 1, wherein the fixing means is a crimp or a punch. 3. The vacuum capacitor according to claim 1, wherein the fixing means is screwed.