JP5885429B2 - Vacuum valve - Google Patents

Description

  The present invention relates to a vacuum valve constituting an arc extinguishing chamber of a vacuum circuit breaker that opens and closes an electric circuit.

  As shown in FIG. 5 of Patent Document 1, for example, a conventional vacuum valve is composed of an insulating cylinder, fixed flanges and movable flanges at both ends of the insulating cylinder, seal rings, and the like. Possible fixed electrodes and movable electrodes are arranged, and each electrode is attached to a fixed rod and a movable rod, respectively, so that the movable electrode can be operated in the axial direction while maintaining vacuum airtightness.

The vacuum valve needs to maintain a high vacuum for a long time in the vacuum container in order to maintain the original cutoff insulation performance. Therefore, the parts are made of a material having a low gas content and subjected to heat treatment to remove the released gas and adsorbed gas inside the vacuum vessel. In addition, a getter in which a gas adsorbent is coated on a base metal is attached in the vacuum vessel. After the vacuum valve is vacuum-sealed by brazing, activation of the gas adsorbent is applied to the getter by heating at the time of brazing, so that slight gas permeation and leakage and release of the adsorbed gas inside the container can be prevented. By adsorbing the getter, a decrease in the degree of vacuum is prevented and the degree of vacuum inside the container is maintained in a good state.
Furthermore, in order to improve the reliability of the vacuum degree of the vacuum valve, in Patent Document 1, a convex portion is formed inside the vacuum vessel as shown in FIGS. 1 to 4, and one end of the getter is fixed to the convex portion. Thus, the other end is placed floating. By this arrangement, both sides of the getter are effectively used as gas adsorption surfaces.

  In addition, the vacuum valve is required to have a high pressure in order to expand its application. However, in Patent Document 2, when a getter is fixed to a high electric field portion, a concave portion (FIG. 4) is provided in the high electric field portion, and the getter is provided in the concave portion. By fixing, the withstand voltage performance deterioration caused by the getter becoming a high electric field is prevented.

JP-A-8-315695 JP 60-175331 A

In the structure of the vacuum valve described in Patent Document 1 and Patent Document 2, when the getter is attached, it is necessary to deform the getter according to the member to which the getter is attached, for example, to be fixed by spot welding, An excessive deformation force was applied to the getter, and the coated gas adsorbent was easily damaged.
Moreover, in the structure which fixes one end and floats the other end like patent document 1, since the other end was free, fixation was unstable. In these structures, when the contact is opened and closed by connecting to the operating mechanism after completion as a vacuum valve, the shock vibration due to that operation is applied to the vacuum valve, so that the gas adsorbent coated on the getter is cracked. There is a situation that falls off. If the fallen matter diffuses to the high electric field part, the withstand voltage performance may be lowered, so it is necessary to prevent the fallen matter from diffusing to the high electric field part.

A vacuum valve according to the present invention is a vacuum valve provided with a vacuum container in which both end portions of an insulating container are hermetically sealed by an end plate assembly, and a pair of electrodes provided in the vacuum container so as to be able to contact and separate. Both or any one of the end plate assemblies includes an end plate to which the electrode is fixed, and an end fitting that is joined to the end of the insulating container together with the end plate and has a shielding function. At the same time, a space is formed in the vacuum vessel by the end plate and the end fitting, and a getter is enclosed in the space.

According to the vacuum valve of the present invention, since the getter fallout can be confined in the space between the end fitting and the end plate, the getter fallout does not diffuse to the high electric field portion and is resistant to damage. Voltage performance can be stabilized and improved.
Further, since the getter is confined in the space portion, it is not necessary to fix the getter to the end fitting, and the gas adsorption function on both sides of the getter can be utilized, so that the reliability of the degree of vacuum can be improved. In addition, since the getter can be enclosed in the space without performing attachment work such as spot welding or brazing, the assembly workability of the vacuum valve can be improved.

It is a sectional side view of the vacuum valve in Embodiment 1 of this invention. It is a sectional side view of the vacuum valve in Embodiment 2 of this invention. It is a sectional side view of the vacuum valve in Embodiment 3 of this invention. It is an expanded sectional view which shows only the stationary side part of the vacuum valve in Embodiment 3 of this invention. It is a sectional side view of the vacuum valve in Embodiment 4 of this invention. It is a perspective view which shows the stationary-side reinforcement board in Embodiment 4 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.

Embodiment 1 FIG.
The vacuum valve according to the first embodiment shown in FIG. 1 includes a vacuum vessel having a fixed structure and a vacuum vessel whose inside is vacuum-sealed by an end plate assembly that is airtightly joined to an end of a cylindrical insulating vessel 1. A vacuum valve provided with a pair of electrodes provided in the container so as to be able to contact and separate. The end plate assembly includes, for example, an inner end joined to the electrode rod 4 and hermetically penetrating the electrode, and the insulating container 1. A disc-like end plate 2 having an outer end extending toward the outer side, a outer end joined to the insulating container 1 and a connecting portion connected to the disc-like end plate 2 and having a shielding function It is composed of an end fitting 15.
For example, the fixed-side end fitting 15 extends the inner peripheral edge, bends the extension, and extends the folded tip 15a to the disc-like end plate 2 together with the disc-like end plate 2. An annular space 17 having a small gap S is formed in the vacuum vessel, and a getter is arranged in the space 17.

Further, the getter 16 is disposed in the fixed side end fitting 15, and then the outer end portion of the disk-shaped fixed side end plate 2 and the connection portion of the fixed side end fitting 15 are brazed. Arranged in the space 17. The getter 16 need not be fixed to the fixed-side end fitting 15 by spot welding or brazing, for example. The getter 16 can be either a button type or a plate type, and a plurality of getters 16 may be arranged. This end structure may be applied not only to the fixed side but also to the movable side, or to both sides of the fixed side and the fixed side. The getter 16 may be arranged only in the space portion on the fixed side, only in the space portion on the movable side, and in both space portions on the fixed side and the movable side.

  In the vacuum valve shown in the first embodiment, the getter 16 is enclosed in a space portion 17 formed by the fixed side end plate 2 and the fixed side end fitting 15, and a gas adsorbing material that is easy to fall off due to an opening / closing impact is formed. Even if the getter 16 falls off, the presence of a dropout is limited in the space 17 between the fixed-side end plate 2 and the fixed-side end fitting 15, and the shield 13 is a high electric field portion outside the space 17. The fallout does not diffuse to the outer surface of the electric field relaxation portion of the fixed-side end fitting 15, the creeping surface of the insulating container 1, the fixed-side contact 5, the movable-side contact 6, and the electrode rods 4 and 7. Further, the getter 16 is disposed in the space portion 17, and the surface coated with the gas adsorbent does not adhere to the fixed side end plate 2 and the fixed side end fitting 15. Since the fixed side end plate 2 and the fixed side end fitting 15 are not airtightly fixed by the brazing material, the gas inside the vacuum valve freely moves from the outside of the space portion 17 into the space portion 17 and is adsorbed by the getter 16.

  In the vacuum valve of the first embodiment described above, since the fallout does not diffuse into the high electric field part, it is possible to suppress a decrease in the withstand voltage performance, and to stabilize and improve the withstand voltage performance. it can. In addition, since the getter 16 is confined in the space portion 17, it is not necessary to fix the getter 16 to the fixed-side end fitting 15, and the gas adsorption function on both sides of the getter 16 can be utilized, thereby improving the reliability of the degree of vacuum. it can. Further, since the getter 16 is only disposed in the fixed-side end fitting 15 at the time of brazing, the getter 16 can be sealed in the space without performing mounting work such as spot welding or brazing. Assembling workability of the valve can be improved.

Embodiment 2. FIG.
The vacuum valve in the second embodiment shown in FIG. 2 has a fixed-side electrode rod 4 in a fixed-side structure.
The fixed-side reinforcing plate 18 is fixed between the fixed-side end plate 2 and the disk-shaped fixed-side end plate 2, and the outer peripheral side tip (peripheral portion) of the fixed-side reinforcing plate 18 superimposed on the fixed-side end plate 2 is fixed side Extending parallel to each other at a predetermined distance from the inner peripheral edge of the end fitting 3 to the downward tip, and extending the tip of the fixed reinforcing plate 18 to the hook-shaped tip of the fixed end fitting 3 (A curved portion formed by bending the distal end portion of the fixed-side end fitting 3 with a radius of curvature toward the inner circumferential direction) is provided to provide a minimal gap S, and the fixed-side reinforcing plate 18 and the fixed-side end fitting 3 The getter 16 is disposed in an annular space 19 formed by

  Similar to the first embodiment, the getter 16 does not have to be fixed to the fixed-side end fitting 3 by spot welding or brazing, for example. The getter 16 may be either a button type or a plate type, and a plurality of getters 16 may be arranged. This end structure may be applied not only to the fixed side but also to the movable side, or to both sides of the fixed side and the movable side. The getter 16 may be arranged only in the space portion on the fixed side, only in the space portion on the movable side, and in both space portions on the fixed side and the movable side.

  In the vacuum valve shown in the second embodiment, the getter 16 is enclosed in a space portion 19 formed by the fixed-side end fitting 3 and the fixed-side reinforcing plate 18, and a gas adsorbent that is easy to drop off due to an opening / closing impact is provided. Even if the getter 16 falls off, the presence of a dropout is limited in the space 19 formed by the fixed-side end fitting 3 and the fixed-side reinforcing plate 18, and the shield 13, which is a high electric field portion outside the space 19, The fallen objects do not diffuse to the outer surface of the electric field relaxation portion of the fixed-side end fitting 15, the creeping surface of the insulating container 1, the fixed-side contact 5, the movable-side contact 6, and the electrode rods 4 and 7.

  Further, the getter 16 is disposed in the space portion 19, and the surface coated with the gas adsorbent does not adhere to the fixed side end plate 2, the fixed side end metal fitting 3, and the fixed side reinforcing plate 18. Further, the fixed-side reinforcing plate 18 is fixed to the fixed-side end plate 2, and the thickness of the fixed-side end plate 2 is increased. It is mechanical strength reinforcement of the fixed side end plate 2 against force.

  In the vacuum valve of the second embodiment described above, since the fallen objects do not diffuse into the high electric field part as in the first embodiment, it is possible to suppress a decrease in the withstand voltage performance and to stabilize and improve the withstand voltage performance. can do. Further, since the getter 16 is confined in the space portion 19, it is not necessary to fix the getter 16 to the fixed-side end fitting 3, and the gas adsorption function on both sides of the getter 16 can be utilized, so that the reliability of the degree of vacuum can be improved. . Further, since the getter 16 is only disposed in the fixed side end fitting 3 at the time of brazing, it can be enclosed in the space portion 19 without performing mounting work such as spot welding or brazing. Assembling workability of the vacuum valve can be improved. Moreover, since the plate | board thickness of the fixed side end plate 2 increases with the fixed side reinforcement board 18, the intensity | strength of a vacuum valve can be improved.

Embodiment 3 FIG.
A vacuum valve according to Embodiment 3 shown in FIGS. 3 and 4 will be described. FIG. 4 is an enlarged cross-sectional view of the vacuum valve fixed side portion, and is an explanatory view showing the dimensional relationship between the fixed side end fitting 3 and the fixed side reinforcing plate 20.
The distal end portion of the fixed-side reinforcing plate 20 in the third embodiment is bent with a radius of curvature toward the outer peripheral direction of the distal end portion of the fixed-side reinforcing plate 18 in the second embodiment, and the maximum height is h1. The axial dimension from the height part (the dimension between the maximum height part and the electrode rod axis) is L2, and the axial dimension from the tip of the fixed reinforcing plate 20 (dimension between the tip part and the electrode rod axis) Is a curved portion (a bowl-shaped curved portion) having L1.
Further, the fixed-side end fitting 3 is bent with a radius of curvature toward the inner circumferential direction in the same manner as the fixed-side end fitting 3 in the second embodiment, and the height of the tip is h2. The fixed side end metal fitting 3 has a curved portion (a bowl-shaped curved portion) whose axial dimension from the distal end portion (the dimension between the distal end portion and the electrode rod axis) is L3.

  In the dimensional relationship, the maximum height h1 of the curved portion at the tip of the fixed-side reinforcing plate 20 is higher than the height h2 of the tip portion of the fixed-side end fitting 3, and the axial direction from the tip of the fixed-side reinforcing plate 20 The dimension L1 is larger than the axial dimension L3 from the distal end portion of the fixed side end fitting 3, and the axial dimension L2 from the maximum height portion of the fixed side reinforcing plate 20 is the axis from the distal end portion of the fixed side end fitting 3. The fixed dimension reinforcing plate 20 and the fixed side end fitting 3 are formed so that the gap S between the tip of the fixed side reinforcing plate 20 and the tip of the fixed side end fitting 3 is less than the thickness of the getter 16 and is smaller than the direction dimension L3. A getter 16 is disposed in the space 21.

  Similar to the first embodiment, the getter 16 does not have to be fixed to the fixed-side end fitting 3 by spot welding or brazing, for example. The getter 16 can be either a button type or a plate type, and a plurality of getters 16 may be arranged. This end structure may be applied not only to the fixed side but also to the movable side, or to both sides of the fixed side and the movable side. The getter 16 may be arranged only in the space portion on the fixed side, only in the space portion on the movable side, and in both space portions on the fixed side and the movable side.

  In the vacuum valve shown in the third embodiment, the getter 16 is enclosed in a space portion 21 formed by the fixed-side end fitting 3 and the fixed-side reinforcing plate 20, and a gas adsorbent that is easy to drop off due to an open / close impact is provided. Even if the getter 16 falls off, the behavior of the fallen object is first accumulated at the tip of the fixed-side end fitting 3, and then on the surface with the change in gravity and the tip of the fixed-side reinforcing plate 20 being inclined. Therefore, it finally returns to the inside of the space portion 21, and the presence of dropped objects is limited in the space portion 21, so that the shield 13, which is a high electric field portion outside the space portion 21, and the fixed-side end fitting 3 The fallen object does not diffuse to the outer surface of the electric field relaxation portion, the creeping surface of the insulating container 1, the fixed contact 5, the movable contact 6, and the electrode rods 4 and 7.

Further, the getter is disposed in the space portion 21 and the surface coated with the gas adsorbent is not bonded to the disk-shaped fixed side end plate 2, fixed side end fitting 3, and fixed side reinforcing plate 20. The getter 16 adsorbs the gas from the gap S provided between the tip of the fixed side reinforcing plate 20 and the fixed side end fitting 3. Further, the fixed-side reinforcing plate 20 is fixed to the fixed-side end plate 2, and the thickness of the fixed-side end plate 2 is increased, thereby reinforcing the mechanical strength of the fixed-side end plate 2.

  In the vacuum valve of the above-described third embodiment, the fallout does not diffuse into the high electric field part as in the first embodiment, so that it is possible to suppress a decrease in the withstand voltage performance and to stabilize the withstand voltage performance. Can be improved. In addition, since the getter 16 is confined in the space portion 21, it is not necessary to fix the getter 16 to the fixed-side end fitting 3, and the gas adsorption function on both sides of the getter 16 can be utilized, thereby improving the reliability of the degree of vacuum. it can.

  Further, since the getter 16 is only disposed in the fixed side end fitting 3 at the time of brazing, it can be enclosed in the space portion 21 without performing mounting work such as spot welding or brazing. Assembling workability of the vacuum valve can be improved. Moreover, since the plate | board thickness of the fixed side end plate 2 increases with the fixed side reinforcement board 20, the intensity | strength of a vacuum valve can be improved. Moreover, since the clearance S is provided between the distal end of the fixed-side reinforcing plate 20 and the distal end of the fixed-side end fitting 3, the reliability of the gas adsorption performance is improved.

Embodiment 4 FIG.
The vacuum valve according to Embodiment 4 shown in FIG. 5 has a fixed-side structure in which a fixed-side reinforcing plate 22 is fixed between the fixed-side electrode rod 4 and the disk-shaped fixed-side end plate 2. As shown, a stepped portion 22a is provided on the outer peripheral edge side of the fixed-side reinforcing plate 22, and when the fixed-side reinforcing plate 22 is superimposed on the fixed-side end plate 2 in the vacuum vessel, the stepped portion 22a A space is formed between the fixed end plate 2 and a getter 23 is accommodated in the space.

  This getter 23 can be applied to either a button type or a plate type, and a plurality of getters 23 may be arranged by providing a plurality of stepped portions on the fixed reinforcing plate 22. This end structure may be applied not only to the fixed side but also to the movable side, or to both sides of the fixed side and the movable side. The getter 23 may be stored only on the fixed side, only on the movable side, or on both the fixed side and the movable side. The getter 23 is stored in the storage portion of the space portion by storing the getter 23 between the stepped portion 22a and the fixed-side end plate 2 and brazing the fixed-side end metal fitting 3 thereafter.

  In the vacuum valve shown in the fourth embodiment, the getter 23 is stored in the step 22a between the fixed-side reinforcing plate 22 and the fixed-side end plate 2 in its initial shape, and it is impossible for the getter 23 to be stored. Arranged without applying deformation force. Further, the getter 23 is disposed in the step 22 a with a sufficient space, and the surface coated with the gas adsorbent does not adhere to the fixed side end plate 2 and the fixed side reinforcing plate 22. Further, the fixed-side reinforcing plate 22 is fixed to the fixed-side end plate 2, and the thickness of the fixed-side end plate 2 is increased, thereby reinforcing the mechanical strength of the fixed-side end plate 2.

  In the vacuum valve of the fourth embodiment described above, since it is not necessary to apply an excessive deformation force to the getter 23 to match the attachment location, the gas adsorbent coated on the base plate of the getter 23 is easily peeled off. Therefore, it is possible to suppress the generation of fallout, so that it is possible to suppress a decrease in withstand voltage performance, and to stabilize and improve the withstand voltage performance.

  Further, since the getter 23 is confined in the space portion, it is not necessary to fix the getter 23 to the fixed-side end fitting 3. Therefore, since the gas adsorption function on both sides of the getter 23 can be utilized, the reliability of the degree of vacuum can be improved. . Further, since the getter 23 is only disposed in the fixed-side end fitting 3 at the time of brazing, it can be sealed without performing mounting work such as spot welding or brazing. Workability can be improved. Moreover, since the plate | board thickness of the fixed side end plate 2 increases with the fixed side reinforcement board 22, the intensity | strength of a vacuum valve can be improved.

DESCRIPTION OF SYMBOLS 1 Insulation container 2 Fixed side end plate 3, 15 Fixed side end metal fittings 4 Electrode rod (fixed side electrode rod)
DESCRIPTION OF SYMBOLS 5 Fixed side contact 6 Movable side contact 7 Electrode rod (movable side electrode rod) 8 Bellows cover 9 Bellows 10 Movable side end fitting 11 Movable side end plate 12 Guide 13 Shield 14, 16, 23 Getter 18, 20, 22 Fixed side Reinforcing plate 17, 19, 21 Space.

Claims (6)

A vacuum vessel comprising a vacuum vessel in which both end portions of an insulating vessel are hermetically sealed by an end plate assembly, and a pair of electrodes provided in the vacuum vessel so as to be able to come in contact with and away from each other. The end plate assembly includes an end plate to which the electrode is fixed, and an end fitting that is joined to the end of the insulating container together with the end plate and has a shielding function, and the end plate and the end. A vacuum valve characterized in that a space is formed in the vacuum vessel by a metal fitting and a getter is enclosed in the space. A vacuum valve comprising a vacuum container in which both end portions of an insulating container are hermetically sealed by an end plate assembly, and a pair of electrodes provided in the vacuum container so as to be able to contact and separate from each other,
Both or any one of the end plate assemblies is composed of an end plate to which the electrode is fixed, and an end fitting that is joined to the end of the insulating container together with the end plate and has a shielding function,
A reinforcing plate is overlaid on the end plate, and the peripheral edge of the reinforcing plate and the peripheral edge of the end fitting are extended in parallel with each other at a predetermined interval, and both ends are joined to each other in the vacuum vessel. vacuum valve form a space, you characterized in that a getter in this space portion. A vacuum valve comprising a vacuum container in which both end portions of an insulating container are hermetically sealed by an end plate assembly, and a pair of electrodes provided in the vacuum container so as to be able to contact and separate from each other,
Both or any one of the end plate assemblies is composed of an end plate to which the electrode is fixed, and an end fitting that is joined to the end of the insulating container together with the end plate and has a shielding function,
The end fitting extends the inner peripheral edge, bends the extension and extends the folded tip to the end plate to form a space in the vacuum vessel together with the end plate. vacuum valve shall be the characterized in that a getter section.   The reinforcing plate has a bowl-shaped bent portion whose tip is bent in the outer circumferential direction, and the end fitting is a bowl-shaped bent portion whose tip is bent in the inner circumferential direction. The maximum height h1 of the tip end portion of the reinforcing plate is higher than the tip height h2 of the tip end portion of the end fitting, and the axial dimension L1 from the tip end portion of the reinforcing plate is It is larger than the axial dimension L3 from the distal end, the axial dimension L2 from the maximum height of the reinforcing plate is smaller than the axial dimension L3 from the highest portion of the distal end of the end fitting, and the distal end of the reinforcing plate 3. The getter is disposed in a space formed by the reinforcing plate and the end fitting, with a gap S between the end plate and the tip of the end fitting being equal to or less than the thickness of the getter. Vacuum valve.   A vacuum vessel comprising a vacuum vessel in which both end portions of an insulating vessel are hermetically sealed by an end plate assembly, and a pair of electrodes provided in the vacuum vessel so as to be able to come in contact with and away from each other. The end plate assembly includes an end plate to which the electrode is fixed, and an end fitting that is joined to the end portion of the insulating container together with the end plate and has a shielding function. A vacuum valve characterized in that a step is provided in a part of the peripheral portion of the reinforcing plate, a space is formed in the vacuum container by the step, and a getter is disposed in the space.   The vacuum valve according to any one of claims 1 to 5, wherein the member in which the space portion is formed is a shield member formed of a metal member and having an electric field relaxation function.

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