JPS6231950Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vacuum valve with a vertical magnetic field type electrode structure, and particularly to a vacuum valve with an improved electrode structure.

Various vertical magnetic field type vacuum valves have been proposed by the applicant and others. As a representative example, FIGS. 1a and 1b show an example of the structure of one side of a pair of electrodes having the same shape. 1 is the contact point, 2 is the main electrode, and marks are generated on this surface when the current is interrupted. Reference numeral 3 denotes a coil electrode, which is composed of an arm portion 3a extending radially from the center, and a connection portion 3c between the outer peripheral portion 3b and the main electrode 2, which rotates in the circumferential direction. The current flowing into the coil electrode 3 from the conductive rod 4 flows through each part of the coil electrode 3 from 3a to 3b to 3.
c, and the current path generates an axial magnetic field, that is, a longitudinal magnetic field, with respect to the arc column. The arc in a vertical magnetic field is uniformly distributed between the contacts, the arc voltage is low and stable, and local melting of the contacts is less likely to occur, so current flow and breaking performance is significantly improved. ing. Reference numeral 5 denotes a reinforcing plate, which is made of a material having sufficiently higher resistance and mechanical strength than the coil electrode 3, such as stainless steel, so that most of the current flows through each part 3 of the coil electrode.
flows to the main electrode 2 through a, 3b, 3c, and
This prevents the coil electrode 3 from deforming and coming into contact with the main electrode 2 at its center. 6 is reinforcement plate 5 with coil reinforcement
Similarly, the resistance is sufficiently larger than that of the coil electrode 3,
The conductive rod 4 is made of a material with high mechanical strength, such as stainless steel, and most of the current flows through the conductive rod 4.
The flow flows from the coil electrode 3 to the coil electrode 3, and the coil electrode 3 is deformed to form the main electrode 2 and the connecting portion 3c of the coil electrode 3.
This prevents deformation such as contact between the arm portion 3a and the outer peripheral portion 3b other than the above. In addition, the coil reinforcement 6 has arms 6a extending radially from the center that have an appropriately small area and a large resistance so that most of the current flows from the conductive rod 4 to the coil electrode 3. being touched.

By the way, with such an electrode structure, the following phenomenon may generally occur. That is, the current flows from the conductive rod 4 to each part of the coil electrode 3 3a → 3b → 3
In order to flow in the order of c → main electrode 2 → contact 1, the connection part between the conductive rod 4 and the coil electrode 3, the connection part 3c between the coil electrode 3 and the main electrode 2, and the connection part between the main electrode 2 and the contact 1, respectively. must be securely connected using silver brazing. By the way, the reinforcing plate 5 and the coil reinforcing plate 6 are also mechanically connected at a predetermined position by silver soldering, and in particular, the reinforcing plate 5 is connected by silver soldering at the center between the coil electrode 3 and the main electrode 2. However, as mentioned above, the connection part 3 between the coil electrode 3 and the main electrode 2
A designed gap g must be provided in order to ensure the connection of c.

If there is a gap g at the connection part of the reinforcing plate 5, there is a problem that when this vertical magnetic field type electrode is inserted by an operation mechanism (not shown), the main electrode 2 or the coil electrode 3 will be deformed and shrunk by the gap g. occurs. Of course, efforts are made to minimize the gap length g in the design, but in order to strictly reduce the dimensional tolerances of each part, it is necessary to use highly accurate processing machines, and a lot of processing time is wasted. It ends up being expensive.

The present invention has been developed in view of the above-mentioned circumstances, and aims to obtain a vacuum valve that does not shrink due to deformation of the coil electrode, using parts that require general processing.

The present invention will be explained below with reference to FIG.
FIG. 2 shows an embodiment of the present invention, which differs from the conventional example shown in FIG. 1 in the following points. That is, in FIG. 2, in which the same parts as in FIG. 1 are labeled with the same symbols, the coil reinforcement 6
A conductive rod 4 is placed between the arm portion 6a of the coil electrode 3 and the reinforcing plate 5 in the space formed by the arm portion 3a and the outer peripheral portion 3b of the coil electrode 3.
A reinforcing member 7 is provided that extends parallel to. This reinforcing member 7 has a cylindrical shape with a diameter less than the width of the arm portion 6a of the coil reinforcing member 6, and is made of a material having high electrical resistance, such as stainless steel.
The reinforcing plate 5 differs from the conventional example in that the diameter of the reinforcing plate 5 is increased on the side facing the main electrode 2, and is connected to a reinforcing member 7.

According to this configuration, the force when the vertical magnetic field electrode is applied by an operation mechanism (not shown) is transmitted to the reinforcing plate 5, the reinforcing material 7, and the coil reinforcing member 6, and is not transmitted to the coil electrode 3, which is different from the conventional method. As in the example, shrinkage deformation due to the gap g is eliminated.

FIG. 3 shows another embodiment of the present invention. In this figure, coil electrodes 8 and 9 have arm portions, an outer peripheral portion, and a connecting portion like the conventional coil electrode 3, but the coil electrode 8 is connected to the main electrode 2 at a central portion 8a. This itself has a well-known double coil structure, and the current flowing into the conductive rod 4 flows through the arm section of the coil electrode 9 → the outer periphery section → the connection section → the outer periphery section of the coil electrode 8 → the arm section →
It flows through the central portion 8a and flows into the main electrode 2. Further, a reinforcing plate 10 is connected to the back surface of the main electrode 2, and the reinforcing shaft 7 is arranged between the reinforcing plate 10 and the coil reinforcing member 6 as in FIG. With this configuration as well, the same functions and effects as the structure shown in FIG. 2 can be obtained. As shown in Figure 3, the greater the number of parts placed between the conductive rods such as coil electrodes and the contacts, the more desirable it is to use parts that require standard machining accuracy. In this sense, the structure shown in Figure 3 is appropriate.

As described above, according to the present invention, the vertical magnetic field electrode is arranged in the space between the outer periphery of the coil electrode and the arm part, and is located between the reinforcing plate arranged on the back surface of the main electrode and the coil reinforcement. By providing the reinforcing material, the force when applying the vertical magnetic field electrode is transmitted to the reinforcing plate, the reinforcing material, and the coil reinforcement, so that a vacuum valve that does not shrink due to deformation of the coil electrode can be obtained.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and an A-O-B sectional view showing a conventional vertical magnetic field electrode, and Figures 2 a and b are a plan view and an A-O-B sectional view showing an embodiment of the present invention. figure,
FIG. 3 is a sectional view showing another embodiment of the present invention. 1... Contact, 2... Main electrode, 3... Coil electrode, 4... Conductive rod, 5... Reinforcement plate, 6... Coil reinforcement, 7... Reinforcement material, 8... Coil electrode, 9...
Coil electrode, 10... reinforcing plate.

Claims (1)

[Scope of Claim for Utility Model Registration] In a vacuum valve that houses a pair of electrodes that can be moved into and out of contact with each other in a vacuum container, a contact point is fixed to the surface of the electrodes and one end of a reinforcing member is fixed to the center of the back surface of the electrodes for reinforcement. A reinforcing member is placed in a space formed by the arm part and the outer circumferential arc part of the coil electrode, with the center part of the other end of the member abutting the center part of one end of the coil electrode, and around the other end of the reinforcing member. One end of the reinforcing material is fixed, the other end of this reinforcing material is fixed to the arm part of the coil electrode reinforcing member, the center part of this coil electrode reinforcing member is fitted with a conductive rod, and the A vacuum valve characterized in that one end of a coil electrode is fixed, and the center part of the other end of the coil electrode is fixed to the conductive rod.