JP2018133193A - Mold vacuum valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold vacuum valve capable of suppressing a rise in temperature due to heat generation caused by energization, without increasing the size of the mold vacuum valve.SOLUTION: A mold vacuum valve includes: a vacuum vessel; an insulation mold disposed to surround the circumference of the vacuum vessel; electrodes disposed inside the vacuum vessel to be capable of coming in contact with and being separated from each other; a movable-side conductive shaft connected to one of the electrode; a fixed-side conductive shaft connected to another electrode; a movable-side conductor electrically connected to the movable-side conductive shaft and making the movable-side conductive shaft slidable; and an extension formed in the circumference of a sliding portion with the movable-side conductive shaft and extending toward the outer peripheral direction of the insulation mold.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a mold vacuum valve.

  Conventionally, a mold vacuum valve has been used as a circuit breaker or the like. In the mold vacuum valve, electrodes are arranged in a vacuum atmosphere in a vacuum vessel, and the periphery thereof is covered with an insulating mold. In the mold vacuum valve having such a configuration, heat accompanying energization is generated in the electrode portion and the like. However, since the periphery of the electrode is in a vacuum atmosphere and the periphery is covered with an insulating mold, heat dissipation is poor. For this reason, it has been proposed to embed a pipe or the like made of a material having good thermal conductivity in the insulating mold to improve heat dissipation (see, for example, Patent Document 1).

  However, even if a pipe made of a material with good thermal conductivity is simply embedded in the insulating mold, it is difficult to obtain sufficient heat dissipation because heat is radiated from the electrodes and the like through the vacuum atmosphere and the insulating mold. For this reason, when the energization amount is increased, an increase in temperature is inevitable.

Japanese Utility Model Publication No.59-4141

  As described above, in the mold vacuum valve, the electrode is disposed in the vacuum atmosphere, and the periphery thereof is covered with the insulating mold. For this reason, it is difficult to release heat generated by energization, and there is a problem that the temperature rises when the energization amount is increased.

  For this reason, when energizing amount is increased, it is necessary to increase the cross-sectional area of the conductor serving as a current path, to reduce resistance, and to suppress the temperature rise, and there is a problem that the mold vacuum valve is increased in size.

  The objective of this invention is providing the mold vacuum valve which can suppress the temperature rise by the heat_generation | fever accompanying energization, without causing the enlargement of a mold vacuum valve.

  The mold vacuum valve according to the embodiment includes a vacuum container, an insulating mold disposed so as to surround the vacuum container, a separable electrode disposed in the vacuum container, and the electrode A movable energizing shaft connected to one of the electrodes, a fixed energizing shaft connected to the other of the electrodes, and an electrically connected to the movable energizing shaft, and the movable energizing shaft slides. And a movable-side conductor that is made free. Furthermore, the movable-side conductor has an extended portion that is formed around a sliding portion of the movable-side conductor with respect to the movable-side conductive shaft and extends toward the outer peripheral direction of the insulating mold.

The figure which shows the cross-sectional schematic structure of the mold vacuum valve which concerns on embodiment. The figure which shows the structure of the movable side conductor of the mold vacuum valve of FIG. The figure which shows the principal part cross-section structure of the mold vacuum valve of FIG. The figure which shows the structure of the movable side conductor which does not have an expansion part.

  Hereinafter, the mold vacuum valve of an embodiment is explained with reference to drawings.

  FIG. 1 is a diagram illustrating a cross-sectional configuration of a mold vacuum valve 100 according to the embodiment. As shown in FIG. 1, the mold vacuum valve 100 includes a soot tube 4, and the inside of this soot tube 4 is a vacuum container 14. An electrode 1 including a pair of electrodes 1 a and 1 b is disposed inside the vacuum vessel 14. A substantially cylindrical arc shield 13 is disposed so as to surround the periphery of the electrode 1.

  A fixed energizing shaft 2 is attached to the electrode 1a located on the upper side in FIG. 1 among the electrodes 1a and 1b. In addition, a movable energizing shaft 3 is attached to the electrode 1b located on the lower side in FIG. The stationary energizing shaft 2 and the movable energizing shaft 3 are led out of the vacuum vessel 14. A bellows 10 for hermetic sealing is disposed at a portion where the movable side energizing shaft 3 is led out of the vacuum vessel 14. The bellows 10 keeps the inside of the vacuum vessel 14 airtight while making the movable-side energizing shaft 3 movable.

  A movable-side conductor 9 that is in contact with the movable-side conductive shaft 3 and is electrically connected to the movable-side conductive shaft 3 is disposed on the movable-side conductive shaft 3 side (lower side in FIG. 1) from the vacuum vessel 14. ing. The movable energizing shaft 3 is slidable with respect to the movable conductor 9. The movable-side energizing shaft 3 is configured to be movable in a predetermined direction (vertical direction in FIG. 1) while maintaining an electrical connection with the movable-side conductor 9.

  In the mold vacuum valve 100, the periphery of the vacuum container 14 and the periphery of the movable conductor 9 and the like are covered with an insulating mold 5. Furthermore, the surface of the insulating mold 5 is covered with a conductive ground layer 6 that is set to the ground potential. The outer shape of the mold vacuum valve 100 in the vertical direction in FIG. 1 is substantially cylindrical, and the movable conductor 9 is formed in a shape extending laterally from the substantially cylindrical portion.

  A movable portion internal space 8 is formed on the movable energizing shaft 3 side in the insulating mold 5. The movable energizing shaft 3 is connected to one end of the insulating rod 7 in the movable portion internal space 8. The other end of the insulating rod 7 is connected to an operating mechanism (not shown), and the electrode 1 is opened and closed by moving the insulating rod 7 in a predetermined direction (vertical direction in FIG. 1). The current flows through the path of the fixed-side conduction shaft 2, the electrode 1, the movable-side conduction shaft 3, and the movable-side conductor 9.

  As shown in FIG. 2, in this embodiment, the end of the movable side conductor 9 extends in the width direction of the movable side conductor 9 toward the outer peripheral direction of the insulating mold 5 so as to approach the surface of the insulating mold 5. An extended portion 9a is formed. In the present embodiment, the extended portion 9a has a substantially disk shape. And the sliding hole 9b is formed in the approximate center part of this expansion part 9a. The movable energizing shaft 3 is slidably disposed so as to be positioned in the sliding hole 9b. In the sliding hole 9 b, for example, a spring-like conductor or the like is disposed so as to be interposed between the inner wall of the sliding hole 9 b and the outer peripheral portion of the movable conductor 9.

  In the present embodiment, the expansion portion 9a is provided with a first heat transfer cylinder 11 located on the upper side in FIG. 1 and a second heat transfer cylinder 12 located on the lower side in FIG. 1 as heat transfer members. Has been. The first heat transfer cylinder 11 and the second heat transfer cylinder 12 are formed in a cylindrical shape, and as shown in FIG. 3, the first heat transfer cylinder 11 and the second heat transfer cylinder 12 are separated from the surface of the insulating mold 5 by a predetermined distance that can ensure insulation. Embedded in the insulating mold 5. That is, the first heat transfer cylinder 11 and the second heat transfer cylinder 12 are arranged along the surface (grounding layer 6) of the substantially cylindrical insulating mold 5.

  In the present embodiment, the outer shape of the insulating mold 5 is substantially cylindrical, and the expanded portion 9a is formed in a disk shape in accordance with this shape, and the first heat transfer cylinder 11 and the second heat transfer cylinder 12 are used. Is cylindrical. However, for example, when the outer shape of the insulating mold 5 is a substantially quadrangular prism shape, the expanded portion 9a is formed in a substantially square shape in accordance with this shape, and the first heat transfer cylinder 11 and the second heat transfer cylinder 12 are formed. It is good also as a square cylinder shape.

  The first heat transfer cylinder 11 and the second heat transfer cylinder 12 are made of a material having a higher thermal conductivity than the insulating mold 5. As such a material, for example, a metal can be used, and among metals, for example, copper or aluminum can be used. By configuring the first heat transfer cylinder 11 and the second heat transfer cylinder 12 with a material having high thermal conductivity, the heat generated by energization can be released more efficiently to the outside.

  Here, like the movable-side conductor 90 shown in FIG. 4, a configuration corresponding to the extended portion 9a having a normal square plate-like outer shape and extending outward around the sliding hole 90b ( 4), a wide space is left between the end of the movable conductor 90 and the surface of the insulating mold 5 (grounding layer 6). In this case, the heat transmitted to the movable conductor 90 is transmitted through the thick insulating mold 5 and radiated from the surface (grounding layer 6) to the surrounding atmosphere, so the efficiency of heat dissipation is poor.

  On the other hand, as in the case of the movable side conductor 9 in the present embodiment, when the extended portion 9a is provided, compared to the case of the movable side conductor 90, the end of the movable side conductor 9 and the surface of the insulating mold 5 (ground layer 6) The interval between the two can be narrowed. Thereby, when heat is generated by energization in the sliding portion of the electrode 1 or the movable side conductor 9 and the movable side energization shaft 3, the heat transmitted to the expansion portion 9 a is transferred from the end of the expansion portion 9 a. It can be efficiently discharged to the surrounding atmosphere through the thin insulating mold 5.

  Furthermore, in this embodiment, the 1st heat transfer cylinder 11 and the 2nd heat transfer cylinder 12 are arrange | positioned as the heat transfer member in the expansion part 9a. Thereby, the heat transmitted to the expansion part 9 a is transmitted to the first heat transfer cylinder 11 and the second heat transfer cylinder 12. The heat transferred to the first heat transfer cylinder 11 and the second heat transfer cylinder 12 can be efficiently released into the atmosphere around the ground layer 6 through the insulating mold 5.

  Further, as shown in FIG. 3, the second heat transfer cylinder 12 is disposed in the insulating mold 5 between the movable portion inner space 8 around the insulating rod 7 and the ground layer 6. For this reason, the heat transmitted from the movable conductor 9 to the second heat transfer cylinder 12 is released into the atmosphere around the ground layer 6 through the insulating mold 5 and also into the movable part internal space 8. The Thereby, heat can be released more efficiently.

  As described above, in the mold vacuum valve 100 of the present embodiment, heat was generated due to energization at the electrode 1 and the sliding portion (the portion of the sliding hole 9b) between the movable conductor 9 and the movable energizing shaft 3. In this case, this heat is transmitted to the expansion portion 9a. Then, the heat transmitted to the expansion portion 9 a is transmitted to the first heat transfer cylinder 11 and the second heat transfer cylinder 12. For this reason, as for the connection part of the 1st heat transfer cylinder 11 and the 2nd heat transfer cylinder 12, and the expansion part 9a, the whole edge part of the 1st heat transfer cylinder 11 and the 2nd heat transfer cylinder 12 and the expansion part 9a connect. It is preferable to be in a state of being made. By setting it as such a structure, the heat conduction from the expansion part 9a to the 1st heat exchanger tube 11 and the 2nd heat exchanger tube 12 is accelerated | stimulated, and from the 1st heat exchanger tube 11 and the 2nd heat exchanger tube 12, more Heat can be released efficiently. In addition, it is preferable to connect the connection part of the 1st heat transfer cylinder 11 and the 2nd heat transfer cylinder 12, and the expansion part 9a by welding, brazing, etc., for example.

  As described above, in the mold vacuum valve 100 of the present embodiment, even when the energization current is increased and the energization heat generation amount is increased, the temperature rise can be suppressed by promoting the heat dissipation. Therefore, there is no need to increase the cross-sectional area of the fixed-side energizing shaft 2, the electrode 1, the movable-side energizing shaft 3, the movable-side conductor 9, and the like to reduce the resistance and suppress the temperature rise, and the mold vacuum valve 100 is enlarged. I don't have to.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 (1a, 1b) ... Electrode, 2 ... Fixed side energizing shaft, 3 ... Movable side energizing shaft, 4 ... Steel pipe, 5 ... Insulation mold, 6 ... Grounding layer, 7 ... Insulating rod, 8 ...... Moving part internal space, 9 ... Moving side conductor, 9a ... Expansion part, 9b ... Sliding hole, 10 ... Bellows, 11 ... First heat transfer cylinder, 12 ... Second heat transfer cylinder, 13 ... Arc shield, 14 ... Vacuum container, 100 ... Mold vacuum valve.

Claims (7)

A vacuum vessel;
An insulating mold disposed so as to surround the vacuum vessel;
A separable electrode disposed inside the vacuum vessel;
A movable energizing shaft connected to one of the electrodes;
A fixed energizing shaft connected to the other of the electrodes;
A movable-side conductor electrically connected to the movable-side conductive shaft, the movable-side conductive shaft being slidable;
An extension portion that is formed around a sliding portion of the movable side conductor with the movable side energizing shaft and extends toward an outer peripheral direction of the insulating mold;
A mold vacuum valve characterized by comprising:   The mold vacuum valve according to claim 1, wherein the extended portion has a substantially disc shape.   The mold vacuum valve according to claim 1, further comprising a heat transfer member that is disposed in the extension portion and is made of a material having a higher thermal conductivity than the insulating mold.   The mold vacuum valve according to claim 3, wherein the heat transfer member has a substantially cylindrical shape.   The mold vacuum valve according to claim 3 or 4, wherein the heat transfer members are respectively disposed on both surfaces of the extended portion.   The mold vacuum valve according to claim 3, wherein the heat transfer member is made of metal. A conductive ground layer provided on the surface of the insulating mold and having a ground potential;
The mold vacuum valve according to claim 3, wherein the heat transfer member is provided along the ground layer in the insulating mold.

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