JP5210789B2 - Vacuum valve - Google Patents

Description

  The present invention relates to a vacuum valve having a pair of contactable and separable contacts that can generate a strong longitudinal magnetic field and improve a cutoff characteristic.

  2. Description of the Related Art Conventionally, a vacuum valve using a contact that can generate a magnetic field parallel to the axial direction of the contact, that is, a so-called longitudinal magnetic field, and improve the interruption characteristics is known (see, for example, Patent Document 1).

One of a pair of contacts of this type is shown in FIG. A cup-shaped slit electrode 2 made of electrolytic copper is fixed to the end of the energizing shaft 1. The electrode 2 with a slit is comprised by the disk-shaped bottom part 2a fixed to the electricity supply shaft 1 end, and the cylindrical outer peripheral part 2b. A plurality of (four) slits 3 that obliquely cross the axial direction are provided on the side surface of the outer peripheral portion 2b. A disc-shaped contactable contact 4 made of a copper alloy is fixed to the open end of the outer peripheral portion 2b. In the space between the contact 4 and the bottom 2a, a reinforcing member 5 made of columnar stainless steel or the like having flanges at both ends is provided.
JP 2008-135338 A (3rd page, FIG. 1)

  The above-described conventional vacuum valve has the following problems. As indicated by the arrow, the current i flows from the energizing shaft 1 to the bottom 2a of the slit electrode 2 and from the bottom 2a to the outer periphery 2b. That is, as shown in FIG. 8, the bottom portion 2 a flows in the radial direction and the outer peripheral portion 2 b flows in the circumferential direction along the slit 3 and flows into the contact 4. A longitudinal magnetic field is generated by this circumferential direction, the arc in the vacuum is controlled, and the interruption characteristic can be improved.

  However, a magnetic field is also generated by a current component spreading in the radial direction, and is superimposed on the magnetic field generated in the circumferential direction. The current i spreading in the radial direction takes a long path from the center of the current-carrying shaft 1 to the outer periphery 2b at the longest at four points divided every 90 degrees, and generates a large magnetic field. For this reason, the distribution of the longitudinal magnetic field that controls the arc becomes non-uniform throughout the contact point 4 and makes it difficult to improve the breaking characteristics.

  The present invention has been made to solve the above problems, and a vacuum valve that shortens the current path that extends in the radial direction within the bottom of the slit electrode, makes the distribution of the longitudinal magnetic field uniform, and improves the cutoff characteristics. The purpose is to provide.

  In order to achieve the above object, the vacuum valve of the present invention is a vacuum valve having a pair of contactable and separable contacts, wherein the contact includes a cup-shaped slit electrode having a bottom portion fixed to a current-carrying shaft end; A contact fixed to the open end of the electrode with the slit, a reinforcing member provided between the contact and the bottom, and a current blocking provided between the reinforcing member and the energizing shaft while penetrating the bottom. And the current blocking member is provided in the axial direction of the energizing shaft.

  According to the present invention, the current blocking member is provided at the end of the current-carrying shaft to fix the slit electrode, so that the current path extending in the radial direction at the bottom of the slit electrode is shortened, and the longitudinal magnetic field generated at the outer peripheral portion The distribution can be improved and the blocking characteristic can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a vacuum valve according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a half sectional view showing one contact used in a vacuum valve according to Embodiment 1 of the present invention, and FIG. 2 is a top view showing one contact used in the vacuum valve according to Embodiment 1 of the present invention. It is. In addition, in each figure, the same code | symbol was attached | subjected about the component similar to the past.

  As shown in FIG. 1, a cup-shaped slit electrode 2 made of electrolytic copper or the like is fixed to the end of the current-carrying shaft 1. The electrode 2 with a slit is comprised by the disk-shaped bottom part 2a fixed to the electricity supply shaft 1 end, and the cylindrical outer peripheral part 2b connected with this outer periphery. A plurality of (four) slits 3 that obliquely cross the axial direction are provided on the side surface of the outer peripheral portion 2b. A disc-shaped contactable contact 4 made of a copper alloy is fixed to the open end of the outer peripheral portion 2b. In the space between the contact 4 and the bottom 2a, a reinforcing member 5 made of columnar stainless steel or the like having flanges at both ends is provided.

  An opening hole 2a1 is provided at the center of the bottom 2a, and a recess 1a is provided at the center of the end of the energizing shaft 1. In these space portions, a cylindrical current blocking member 6 made of an insulating material such as ceramics, or a metal material having a higher resistance than electric copper, such as an iron alloy or a copper alloy, is provided. That is, the current blocking member 6 passes through the bottom portion 2a and is provided in the axial direction of the energizing shaft 1 (corresponding to the recess 1a). The current blocking member 6 and the reinforcing member 5 are in contact with each other.

  Thereby, as shown by the arrows in FIGS. 1 and 2, the current i is spread in the outer circumferential direction by the current blocking member 6 in the current-carrying shaft 1, flows to the bottom 2a of the slit electrode 2, and then to the outer circumferential portion 2b. And a flowing path. In the bottom portion 2b, the current path extending in the radial direction extends from the outer periphery of the current blocking member 6 to the outer peripheral portion 2b, and is short. For this reason, the magnetic field generated by the current component spreading in the radial direction can be made extremely small.

  Here, the electrode 2 with a slit, the contact 4, the reinforcing member 5, and the current blocking member 6 constitute one of the contact points that can be contacted and separated. The same applies to the other contact.

  In addition, the depth of the current blocking member 6 on the energizing shaft 1 side is set to be equal to or greater than the thickness of the bottom portion 2a. This is because the magnetic field is generated by the current component spreading in the radial direction even in the energizing shaft 1, and this influence is suppressed. In addition, the current is narrowed at the end of the energizing shaft 1 but has a predetermined current capacity for energizing the slit electrode 2. Furthermore, if the resistance of the current blocking member 6 is made higher than that of the reinforcing member 5, the effect of suppressing the diversion from the current-carrying shaft 1 side is great, which is preferable.

  According to the vacuum valve of the first embodiment, since the recess 1a is provided in the central portion of the end of the energizing shaft 1 and the current blocking member 6 penetrating the bottom 2a of the electrode 2 with slit is fixed, The current flow is widened to the outer peripheral side, and the current path spreading in the radial direction at the bottom 2a can be shortened. For this reason, the magnetic field generated at the bottom portion 2a is reduced, the distribution of the magnetic field generated at the outer peripheral portion 2b is improved, and the cutoff characteristic can be improved.

  Next, a vacuum valve according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a half sectional view showing one contact used in the vacuum valve according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in the shape of the current blocking member. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, the bottom of the recess 1 a at the end of the current-carrying shaft 1 has a concave conical shape, and a conical protrusion 6 a that protrudes from the current blocking member 6 is provided. That is, the current blocking member 6 has a conical shape protruding from the inner side of the energizing shaft 1 in the axial direction.

  According to the vacuum valve of the second embodiment, in addition to the effects of the first embodiment, the current flow in the energizing shaft 1 can be smoothly spread in the radial direction.

  Next, a vacuum valve according to Embodiment 3 of the present invention will be described with reference to FIGS. 4 and 5 are half sectional views showing one contact used in the vacuum valve according to the third embodiment of the present invention. The third embodiment is different from the first embodiment in the shape of the current blocking member. 4 and 5, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the current blocking member 6 is provided with a hollow portion 6 b in the central portion in the axial direction. The hollow portion 6b is provided from the reinforcing member 5 surface to the bottom surface of the concave portion 1a. Further, as shown in FIG. 5, the outer diameter of the current blocking member 6 is made smaller than the inner diameters of the opening hole 2a1 and the recess 1a, and a gap 6c is provided. Here, the hollow portion 6b and the gap portion 6c are simply referred to as a gap portion.

  According to the vacuum valve of the third embodiment, in addition to the effect of the first embodiment, the current blocking member 6 is provided with a gap, so that the current diverted from the energizing shaft 1 can be suppressed. In particular, when the current blocking member 6 is made of a material whose resistance is not significantly different from that of the slit electrode 2, the effect of suppressing the diverted current is increased.

  In the third embodiment, the current blocking member 6 is provided with a gap. However, when the contact 4 can be firmly fixed by the reinforcing member 5, the current blocking member 6 itself is not provided. The recess 1a and the opening hole 2a1 may be a space.

  Next, a vacuum valve according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 6 is a half sectional view showing one contact used in the vacuum valve according to the fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment in that the reinforcing member and the current blocking member are integrated. In FIG. 6, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6, the current blocking member 6 is provided with a contact fixing portion 6 d connected to the current blocking member 6 and formed from the bottom 1 a surface to the contact 4. That is, the contact 4 to the bottom surface of the recess 1a of the energizing shaft 1 are integrated.

  According to the vacuum valve of the fourth embodiment, in addition to the effects of the first embodiment, the contact 4 is fixed and the current blocking member 6 that spreads the current flow in the radial direction is integrated. Can be reduced.

1 is a half cross-sectional view showing one contact used in a vacuum valve according to Embodiment 1 of the present invention. The top view which shows one contact used for the vacuum valve which concerns on Example 1 of this invention. The half sectional view showing one contact used for the vacuum valve concerning Example 2 of the present invention. The half sectional view showing one contact used for the vacuum valve concerning Example 3 of the present invention. The half sectional view showing one contact used for the vacuum valve concerning Example 3 of the present invention. The half sectional view showing one contact used for the vacuum valve concerning Example 4 of the present invention. The half sectional view which shows one contact used for the conventional vacuum valve. The top view which shows one contact used for the conventional vacuum valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Current supply shaft 1a Recessed part 2 Electrode with slit 2a Bottom part 2a1 Opening hole 2b Outer peripheral part 3 Slit 4 Contactor 5 Reinforcement member 6 Current blocking member 6a Projection part 6b Hollow part 6c Gap part 6d Contact fixing part

Claims (3)

In a vacuum valve having a pair of contactable and separable contacts,
The contact is an electrode with a cup-like slit whose bottom is fixed to the end of the current-carrying shaft,
A contact secured to the open end of the slit electrode;
A reinforcing member provided between the contact and the bottom;
And having a current blocking member provided between the reinforcing member and the energizing shaft while penetrating the bottom portion,
A vacuum valve characterized in that the current blocking member is provided to the inside of the energizing shaft in the axial direction.   The vacuum valve according to claim 1, wherein the current blocking member has a conical shape protruding from the energizing shaft side.   The vacuum valve according to claim 1, wherein a gap is provided in the current blocking member.

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