JP3568683B2 - Vacuum valve - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a vacuum valve, and more particularly, to a vertical magnetic field type vacuum valve.
[0002]
[Prior art]
In order to improve the breaking performance, a vacuum valve incorporating a so-called vertical magnetic field type electrode, which applies a magnetic field in parallel to an arc generated between the contacts, is employed in a circuit breaker or the like. There are several proposals for an electrode in which a magnetic substance is incorporated in this vertical magnetic field type electrode. Among them, there is an electrode disclosed in JP-A-55-146823.
[0003]
As shown in the partially exploded perspective view shown in FIG. 28 and the explanatory view of FIG. 29, this electrode has four arc-shaped outer peripheral portions on the back surface of the arc electrode 23B attached to the tip of the annular coil electrode 21B. The magnetic bodies 38A, 38B, 38C, 38D are arranged at predetermined intervals of 90 °.
[0004]
In the vacuum valve incorporating the electrode configured as described above, the magnetic flux Φ generated in the axial direction by the cut-off current flowing through the coil electrode 21B as shown in FIG. 29 causes the magnetic bodies 38A, 38B, Detour outside through 38C, 38D.
[0005]
Therefore, in a vacuum valve in which a magnetic material is arranged on the outer peripheral portion of the electrode and the coil electrode is incorporated, the generated magnetic flux is spread in the outer peripheral direction between the electrodes, and it is as if the magnetic field generation region is the same as an electrode having a wide magnetic field generation region. The effect can be obtained, and the blocking performance can be improved.
[0006]
On the other hand, as an electrode for regulating the direction of the magnetic flux generated from the coil electrode, there is an electrode disclosed in Japanese Patent Application Laid-Open No. 58-48320. In this electrode, a shunt-type coil electrode 21C is provided on the back of the arc electrode 23C as shown in FIG. 30 and FIG.
[0007]
The coil electrode 21C connects the movable-side energized shaft 7 and the arc electrode 23C, and changes the direction of the current flowing from the movable-side energized shaft 7 to the arc electrode 23C into a loop around the movable-side energized shaft 7 as an axis. Generate a magnetic field in the direction.
[0008]
That is, a cylindrical inner ring 13 whose base end is joined to the distal end of the movable-side energized shaft 7, second connection arms 16a, 16b, and 16c radially formed at intervals of 120 ° from the inner ring 13; Outer rings 14a, 14b, 14c formed in an arc shape from the tips of the second connection arms 16a, 16b, 16c, the insulating spacer 11, the lower end of which is loosely fitted in a recess formed in the tip of the movable-side conducting shaft 7, and A connection spacer 36 whose base end is fitted to the front end of the insulating spacer 11 and first connection arms 15a, 15b, 15c connecting the front ends of the outer rings 14a, 14b, 14c to the outer periphery of the connection spacer 36 are provided. .
[0009]
Further, arm portions 17b are formed radially at 120 ° intervals on the outer periphery of the coil support member 17, the inner periphery of which is fitted and fixed to the outer periphery of the distal end of the movable-side conducting shaft 7. The lower ends of the outer rings 14a, 14b, and 14c described above in FIG. 30 are joined to the distal end of the arm portion 17b. Inside the outer rings 14a, 14b, and 14c, different curvatures made of silicon steel plates are provided. In FIG. 30, four arc-shaped magnetic plates 18 are erected in the axial direction at intervals of 120 °.
[0010]
In the vacuum valve incorporating the electrode configured as described above, the magnetic flux generated by the current flowing through the outer rings 14a, 14b, and 14c of the coil electrode 21C passes through the respective magnetic plates 18 so that even a weak magnetic field is generated. Even so, a vertical magnetic field electrode in which the magnetic flux is efficiently regulated in the axial direction can be provided.
[0011]
On the other hand, a vacuum valve employing the vertical magnetic field electrode shown in FIG. 32 is also employed. FIG. 32 also shows the case of the movable side electrode, and the fixed side electrode has the same structure. In FIG. 32, a circular counterbore 7b is formed at the tip of a movable-side energizing shaft 7B made of a copper bar, and the counterbore 7b has a substantially T-shaped vertical section and is a plan view (not shown). In this case, a shaft portion 25a protruding from the lower portion of the annular stainless steel reinforcing member 25 is fitted and brazed.
[0012]
An annular shaft portion 24a made of copper material and formed at the center of the coil electrode 24 described below is inserted into the outer periphery of the shaft portion 25a, and is brazed to the shaft portion 25a and the movable-side energizing shaft 7B. I have.
[0013]
In the coil electrode 24, four arms 24b are radially projected at intervals of 90 ° in a plan view (not shown) from the outer periphery of the shaft portion 24a and in a direction orthogonal to the axial direction. A base end of an arc-shaped coil portion 24c in an unillustrated plan view is brazed to the front end. At the ends of these coil portions 24c, through holes 24d are formed in the axial direction as shown in FIG.
[0014]
In FIG. 32, a shaft portion of a copper-made connector 24e having a substantially T-shape and a circular shape in a plan view (not shown) is inserted into these through holes 24d and brazed to the tip of the coil portion 24c. .
[0015]
On the upper end surface of the reinforcing member 25, an electrode plate 12 which is formed in a disk shape from a copper plate and has grooves (not shown) formed radially from the center to the outer periphery is placed. The electrode plate 12 is brazed to surfaces of the reinforcing member 25 and the connector 24e.
[0016]
A contact 23a is formed on the upper surface of the electrode plate 12 in a disk shape from a copper-chromium alloy, and a groove (not shown) is formed radially from the center to the outer periphery in the same manner as the electrode plate 12, and the outer peripheral surface is chamfered in an arc shape. Are joined by brazing.
[0017]
In the electrode of the vacuum valve configured as described above, for example, most of the current flowing from the movable-side conducting shaft 7B to the contact 23a passes through the plurality of arms 24b from the shaft 24a of the coil electrode 24, It flows to the coil part 24c at the tip of 24b. A part of the current flows into the electrode plate 12 via the reinforcing member 25.
[0018]
The current flowing into the coil portion 24c flows from the connector 24e at the tip of each coil portion 24c to the electrode plate 12 via the outer peripheral back surface of the electrode plate 12, and from the surface of the electrode plate 12 to the contact 23a. leak.
[0019]
The current flowing out to the contact 23a flows from the contact 23a to the contact of the fixed electrode in contact with the surface of the contact 23a, and thereafter passes through the electrode plate of the fixed electrode, the connector, and the coil electrode, and then passes through the fixed side. It flows out to the energized shaft.
[0020]
FIG. 33 is a graph showing the distribution of the magnetic field in the axial direction, that is, the magnetic flux density Bz of the longitudinal magnetic field, generated by the current flowing through each coil electrode in the movable electrode and the fixed electrode configured as described above. The movable electrode is separated from the fixed electrode, an arc is generated between the two electrodes, and the distribution of the magnetic flux generated by the arc current has the same tendency.
[0021]
As shown in FIG. 33, the magnetic flux density Bz of the vertical magnetic field is maximum at the axis 0 of the electrode, and decreases toward the outer periphery of the electrode, forming a substantially sinusoidal curve. The magnetic flux density Bc at both ends of the electrode shown in FIG. 33 is shown in FIG. 32 so as to be about 1.2 times the magnetic flux density at which the arc voltage becomes minimum with respect to the rated breaking current of the vacuum valve. The coil electrode 24 is designed.
[0022]
The arc generated between the electrodes that generate such a vertical magnetic field does not locally concentrate on the surfaces of the two electrodes, but spreads over the entirety and uniformly, compared to the electrodes that do not generate a vertical magnetic field. Therefore, melting of the contact surface due to local concentration can be prevented, a rise in metal vapor pressure caused by the melting can be prevented, an increase in arc can be suppressed, and a breaking performance can be improved.
[0023]
[Problems to be solved by the invention]
However, even in the vacuum valve configured as described above, if the breaking current further increases, the number of arcs generated at the central portion of the contact having a high magnetic flux density increases, which is an obstacle to further improving the breaking performance.
[0024]
It is believed that the arc is concentrated at the center of the contact due to the effect of the pinch force caused by the self-current acting on the arc and the characteristic that the arc current is concentrated in a strong magnetic field region. Experiments have also confirmed that the latter effect of concentrating on a strong magnetic field is greater than the effect.
[0025]
For this reason, a method of further increasing the magnetic flux density of the distribution characteristics shown in FIG. 33 to improve the interruption performance is conceivable. However, according to the experimental results of the inventors, when the interruption current increases, the arc also concentrates on the central portion.
[0026]
Further, a method of reducing the intensity of a vertical magnetic field generated at the center of the electrode by an eddy current flowing through the electrode plate 12 shown in FIG. 32 has also been attempted, but this method also reduces the concentration of the arc at the center of the electrode. It cannot be effectively prevented.
Therefore, an object of the present invention is to provide a vacuum valve that can prevent arc concentration on the center portion of an electrode and can further improve shutoff performance.
[0031]
[Means for Solving the Problems]
The vacuum valve of the invention according to claim 1 is, From both ends of the insulating cylinder to the inside of the insulating cylinderAxiallyThe coil electrode is connected to the front end of the inserted current-carrying shaft via a connecting part on the front surface of the coil electrode.The coil electrode has an arm portion formed in a direction orthogonal to the axial direction of the current-carrying axis, and an arc-shaped coil portion formed at a tip of the arm portion.In vacuum valves,It has a U-shaped part in the cross-sectional shape orthogonal to the axial direction.A magnetic body having a connection portion loosely fitted inside the U-shaped portion is interposed between the coil electrode and the contact.
[0032]
Claims2The invention described inOpposite the side where the arm is formedInside the tip of the coil partConnectionIt is characterized by being extended.
Claims3The invention described in (1) is characterized in that a ceramic coating is formed on the surface of the magnetic material on the coil electrode side.
[0033]
Claims4The invention described in (1) is characterized in that a coating of copper or ceramics is formed on the outer peripheral side surface of the magnetic body.
Claims5Is characterized in that the contact is annular.
[0034]
Claims6According to the invention described in (1), the contact has a U-shaped vertical cross section that accommodates the magnetic body inside, and a cylindrical magnetic body is provided between the inner periphery of the insulating cylinder and the arc shield inside the insulating cylinder. It is characterized by having.
[0047]
By such means, claim 1In the invention described in (1), the voltage generated at the coil electrodeHas a U-shaped partDue to the magnetic flux passing through the magnetic material, a vertical magnetic field between the movable magnetic material at the open end of the fixed magnetic material and the fixed magnetic material at the movable magnetic material open end. And a vertical magnetic field between the U-shaped opposed portions.
[0048]
The combined magnetic field of these vertical magnetic field and the vertical magnetic field generated by the coil electrode is formed into an annular intensity distribution that is low at the center of the contact and high around this point, and the arc generated between the contacts is dispersed over a wide surface to extinguish in a short time. Arc.
[0049]
Claims2In the invention described in (1), the magnetic flux generated at the connection part in the opposite direction further reduces the strength of the vertical magnetic field at the center between the contacts, suppresses the concentration of the arc at the center of the contacts, and extinguishes the arc in a short time. I do.
[0050]
Claims3In the invention described in (1), the current passing through the magnetic body is prevented to prevent a decrease in the strength of the longitudinal magnetic field.
Claims4In the invention described in (1), the evaporation and interruption performance by the arc transferred to the outer peripheral portion of the magnetic body are prevented.
[0051]
Claims5In the invention described in (1), the occurrence of an arc at the center of the contact is prevented.
Claims6In the invention described in (1), the arc generating area of the contact is enlarged to disperse the arc and reduce the density.
[0054]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a vacuum valve of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of the vacuum valve of the present invention. FIG. 1 shows an open state.
[0055]
In FIG. 1, a lower end of a sealing metal member 2a made of a stainless steel plate in an annular shape is brazed to an upper end of an insulating cylinder 1 formed in a cylindrical shape by alumina porcelain or the like. A fixed-side end plate 2A made of a stainless steel plate into a disk shape is brazed to the upper end surface of the sealing fitting 2a.
[0056]
On the other hand, the lower end of the insulating cylinder 1 is also brazed to the upper end of a sealing member 2b having the same shape as the sealing member 2a, and the lower end of the sealing member 2b has the same outer shape as the fixed end plate 2A. The side end plate 2B is symmetrically brazed. The insulating cylinder 1, the sealing metal fittings 2a and 2b, the fixed end plate 2A, and the movable end plate 2B constitute a cylindrical vacuum vessel 3 whose both ends are closed.
[0057]
Among them, on the lower surface of the fixed-side end plate 2A, the upper end of a small-diameter, short-cylindrical arc shield 9A made of stainless steel and having a lower end curved outward is brazed in advance coaxially with the insulating cylinder 1. . Similarly, on the upper surface of the movable side end plate 2B, the lower end of the slightly larger arc shield 9B having the same shape as the arc shield 9A is symmetrically brazed in advance.
[0058]
A bush 10 formed in a substantially convex shape is inserted from below into a through hole formed through the center of the movable side end plate 2B. Inside the arc shield 9B, the lower end on the opening side of a bellows 8 made of a stainless steel plate into a substantially U shape is brazed.
[0059]
The outer periphery of an annular support ring 9a is brazed to the center of the inner periphery of the insulating cylinder 1. An arc shield 9C made of a stainless steel plate in a substantially cylindrical shape is welded coaxially to the insulating cylinder 1 on the inner periphery of the support ring 9a.
[0060]
A fixed-side energizing shaft 6 penetrates through a through-hole formed in the center of the fixed-side end plate 2A from above, and the lower surface of a head 6a formed at the upper end of the fixed-side energizing shaft 6 is It is brazed to the end plate 2A. At the lower end of the fixed-side energizing shaft 6, a central portion of the upper end of the fixed-side electrode 4, which will be described in detail in an enlarged detailed longitudinal sectional view of FIG.
[0061]
On the other hand, the movable-side energized shaft 7 is also provided through the bush 10 inserted into the movable-side end plate 2B. The movable-side energizing shaft 7 also penetrates the upper end of the bellows 8 described above, and the bellows 8 is air-tightly brazed to an intermediate portion of the movable-side energizing shaft 7. It is the same product as the electrode 4, and a movable electrode 5 described later in FIG. 2 is symmetrically brazed.
[0062]
In the vacuum valve configured as described above, the support ring 9a, the arc shield 9c, and the mounting bracket 2b are first brazed to the insulating cylinder 1, and in the final stage of brazing assembly, the fixed side end plate 2A and the sealing The metal fitting 2a and the upper end of the insulating cylinder 1 are brazed in a vacuum heating furnace via a jig (not shown). As a result, the inside of the vacuum container 3 is controlled to a state close to a vacuum of about 0.1 Pa or less.
[0063]
The lower end of the movable-side energizing shaft 7 is connected to the upper end of an insulating rod (not shown). The lower end of the insulating rod is connected to an operating rod of an operating mechanism such as a vacuum circuit breaker or a vacuum switch in which the vacuum valve is housed. It is connected to.
[0064]
The movable-side energized shaft 7 is driven up and down as shown by an arrow A via an operating rod and an insulating rod driven by this operating mechanism, and the movable-side electrode 5 at the upper end of the movable-side energized shaft 7 is fixed. The electrode is opened from the side electrode 4 and then turned on.
[0065]
The arc generated between the movable electrode 5 and the fixed electrode 4 when the electrode is opened from the fixed electrode 4 is extinguished when the distance between the electrodes reaches a predetermined distance. As a result, the circuit connected to the vacuum valve is closed. Load current and fault current are cut off.
[0066]
FIG. 2 is an enlarged vertical sectional view showing the fixed-side electrode 4 and the movable-side electrode 5 and corresponds to FIGS. 30 and 32 shown in the prior art.Is. 2 shows the movable-side electrode 5, the fixed-side electrode 4 is also symmetrical and has the same structure.
[0067]
That is, an annular support 30 provided on a jig (not shown) is shown above the movable-side energizing shaft 7 with respect to the lower end of the movable-side electrode 5, and the upper portion of the movable-side energizing shaft 7 penetrates. I have. An annular support plate 32 made of a mild steel plate is mounted on the upper surface of the support 30.
[0068]
A central portion 21a of the coil electrode 21 is brazed to the upper end of the movable-side energized shaft 7, and two arms 21b of the coil electrode 21 are orthogonal to the axial direction at 180 ° intervals on the outer periphery of the central portion 21a. An arc-shaped coil portion 21c is formed at the tip of each of the arm portions 21b.
[0069]
At the tip of each coil portion 21c, a convex portion 21d slightly protruding upward is formed, and at the central portion 21a of the coil electrode 21, a connecting plate having a convex shape in FIG. Twenty convex portions 20a are inserted and brazed to the central portion 21a.
[0070]
A magnetic material 31 made of pure iron and formed in an arc shape in a plan view (not shown) having a U-shaped cross section is inserted into each coil portion 21c in advance from below.
On the upper surface of each magnetic body 31, a disk-shaped arc electrode 23 is brazed via the connection plate 20 and the protrusion 21d of the coil 21d. The fixed side electrode 4 of the same product as the movable electrode 5 configured as described above is brazed to the lower end of the fixed side conducting shaft 6 as shown in FIG.
[0071]
In the vacuum valve having the fixed side electrode 4 and the movable side electrode 5 as described above, the current flowing from the fixed side conductive shaft 6 to the movable side conductive shaft 7 shown in FIG. Flows radially from the fixed-side conducting shaft 6 to the arm 21b of the coil electrode 21 of the fixed-side electrode 4.
[0072]
This current flows from the tip of each arm 21b into each coil 21c formed at the tip of each arm 21b, and flows from the projection 21d at the tip of each coil 21c to the outer periphery of the arc electrode 23.
[0073]
The current flowing into the outer periphery of the arc electrode 23 flows into the arc electrode 23 of the movable electrode 5 via the surface of the arc electrode 23, and likewise from the outer periphery of the arc electrode 23, the coil portion 21 of the coil electrode 21. Through the arm portion 21 b and the movable electrode shaft 7.
[0074]
In this process, the magnetic flux generated by the current flowing through each arm 21b and each coil 21 passes through the magnetic body 31 whose inside is fitted into each arm 21b and each coil 21c, and the fixed electrode 4 A magnetic flux in a direction parallel to the axis is generated between the movable electrode 5 and the arc electrode 23 of the movable electrode 5, so that a so-called vertical magnetic field is generated.
[0075]
Therefore, in a vacuum bulb in which the electrodes configured as described above are incorporated, the arc generated between the vertical magnetic field electrodes spreads uniformly over the opposing surfaces of the electrodes, and locally excessive heat input on the electrode surfaces. Can be prevented, so that the blocking performance can be improved.
[0076]
FIG. 3 is a graph showing the density of an axial magnetic flux generated between the electrodes of a vacuum valve in which such an electrode is incorporated.
3, a pair of peaks (note; three-dimensionally annular) of the maximum value of the magnetic flux in the direction parallel to the axial direction is formed by the magnetic flux passing through the magnetic path inside the magnetic body 31 shown in FIG. A curve B is formed, and the magnetic flux becomes zero at the center of each coil portion 21c outside of these peaks, and the outside of the zero portion is caused by the reverse magnetic flux passing through the magnetic path outside the magnetic body 31. A pair of slightly lower peaks are formed.
[0077]
Next, FIG. 4 is a partial longitudinal sectional view showing a second embodiment of the vacuum valve of the present invention.Is.
4 differs from FIG. 2 shown in the first embodiment in that the magnetic body 31A has an L-shaped vertical cross-section, and instead of the support 30 and the support plate 32 shown in FIG. The support plate 32A is fixed to the outer periphery of the upper end of the center portion 21a of the coil electrode 21 by fitting the inner periphery thereof. Therefore, the same elements as those in FIG.
[0078]
FIG. 5 is a graph showing the density of magnetic flux generated between the electrodes of the vacuum valve in which such an electrode is incorporated, and corresponds to FIG. 3 shown in the first embodiment.
In FIG. 5, the peak where the maximum value of the magnetic flux in the direction parallel to the axial direction becomes annular due to the magnetic flux passing through the magnetic path inside the magnetic body 31A shown in FIG. In addition, the curve C is formed broadly, and the magnetic flux becomes zero outside these magnetic bodies 31A outside these peaks.
[0079]
In a vacuum bulb in which such a magnetic field is formed, the arc generated between the fixed-side electrode and the movable-side electrode is gradually and widely distributed between the electrodes as shown in FIG. The arc can be diffused over the entire electrode surface by the vertical magnetic field, so that a local temperature rise can be prevented and the arc can be extinguished in a short time.
[0080]
Next, FIG. 6 is a partial longitudinal sectional view showing a third embodiment of the vacuum valve of the present invention.Is. FIG. 7 is a sectional view taken along the line DD of FIG. 6 and corresponds to FIG. 31 shown in the prior art.
[0081]
6 and 7, what differs from the first and second embodiments shown in FIGS. 2 and 4 is the number, shape, and arrangement of the magnetic materials attached around the coil electrode 21. Therefore, like FIG. 5, the same elements as those in FIG.
[0082]
That is, on the outer peripheral side of the left and right coil electrodes 21, a longitudinal section is L-shaped, and in FIG. 7, an annular magnetic body 31 </ b> B is provided, and also on the inner peripheral side of the coil electrode 21, the longitudinal section is L-shaped. In FIG. 7, an arc-shaped magnetic body 31C is provided symmetrically.
[0083]
A fixing bracket 31D made of a mild steel material is inserted between the magnetic body 31C and the outer periphery of the central portion 21a fitted to the upper end of the movable-side energized shaft 7, and brazed to the inner periphery of the magnetic body 31C. I have.
[0084]
In the vacuum bulb in which the electrode configured as described above is incorporated, the magnetic material 31B whose outer peripheral side is formed to be longer in the axial direction on the outer peripheral side of the coil electrode 21 only increases the magnetic flux density near the outer periphery of the arc electrode 23. Not the magnetic material 31 provided on the inner peripheral side of the coil electrode 21CBy using the metal fittings 31D, a vertical magnetic field averaged in the radial direction can be formed even inside the coil electrode 21. Therefore, compared to the electrodes in the magnetic flux distribution graph shown in FIG. 5, the magnetic flux generated between the electrodes can be further leveled, and the cutoff characteristics can be further improved.
[0085]
Further, the coupling between the movable-side energizing shaft 7 and the magnetic body 31C can be strengthened by the interposition of the fixing bracket 31D, and therefore, the coupling between the movable-side energizing shaft 7 and the arc electrode 23 can be strengthened. Therefore, the mechanical life of the electrode may be extended.
[0086]
Next, FIG. 8 is a partial longitudinal sectional view showing a fourth embodiment of the vacuum valve of the present invention.Is.
FIG. 8 shows a magnetic body 31A1 in which the thickness on the axial center side, that is, the inner peripheral side is increased with respect to the magnetic body 31A shown in FIG. 4, and the rest is the same as the electrode structure shown in FIG. It is.
That is, in the magnetic body 31A1 shown in FIG. 8, the thickness of the inner portion in the axial direction is about twice the thickness of the portion in the direction perpendicular to the axial direction.
[0087]
In this case, the magnetic material 31 shown in FIG.AIn FIG. 5, since the cross section of the magnetic path in the direction parallel to the axis becomes narrower than the magnetic path in the direction perpendicular to the axis, the cross section of the magnetic path in the direction parallel to the axis can be increased. The strength of the magnetic field in the center valley portion of the curve C in the graph can be increased, and leveling can be further achieved.
[0088]
FIG. 9 is a partial longitudinal sectional view showing a fifth embodiment of the vacuum valve of the present invention. 9, FIG. 9, FIG. 4, FIG. 6, and FIG. 8 shown in the first to fourth embodiments are different from the cylinder in which the slit is formed obliquely with respect to the cylindrical portion instead of the coil electrode. This is a point that the cup-shaped electrode 33 is formed, and a cylindrical magnetic body 31 </ b> D is inserted into the inner peripheral surface of the cylindrical cup electrode 33.
[0089]
Even in the vacuum valve having the electrodes configured as described above, the axial magnetic flux generated by the axial current flowing through the cylindrical cup electrode 33 is caused to pass through the inside of the magnetic body 31 </ b> D so that the inner central portion of the electrode is formed. The magnetic flux passing therethrough can be reduced, and the axial magnetic flux passing between the opposing electrodes can be effectively passed between the opposing surfaces of the electrodes.
[0090]
Next, FIG. 10 is a partial longitudinal sectional view showing a sixth embodiment of the vacuum valve of the present invention.Is.
In FIG. 10, the configuration is the same as that of the electrode shown in FIG. 2, except for the method of manufacturing the arc electrode 23C.
[0091]
That is, in the arc electrode 23C used for this electrode, the magnetic powder 23c is mixed in the base material.
As shown in FIG. 10, a contact 23a made of a copper-chromium alloy or the like is brazed to the surface of a base material 23b, and iron powder is mixed into the copper material in the base material 23b.
[0092]
In the vacuum valve configured as described above, the magnetic flux passing between the magnetic bodies 31 incorporated in the fixed side electrode and the movable side electrode causes the magnetic flux in the base material 23 b interposed on the facing surface of each of the magnetic bodies 31. Since a uniform magnetic field is formed between the contacts by the iron powder, the magnetic flux at the valleys in the graph shown in FIG. 3 can be increased.
[0093]
Therefore, the curve of the graph showing the strength of the magnetic field shown in FIG. 3 and the magnetic field by the electrode shown in FIG. 10 are different from the curve B shown in FIG. Can be leveled, so that the cutoff characteristics can be further improved.
The arc electrode 23a shown in FIG. 10 can be similarly applied to the arc electrode 23 shown in FIGS. 4, 6, 8, and 9.
[0094]
Next, FIG. 12 is a partial longitudinal sectional view showing a seventh embodiment of the vacuum valve of the present invention.Is. 13 is a sectional view taken along the line HH in FIG. 12, and FIG. 12 corresponds to a sectional view taken along the line JJ in FIG.
[0095]
12 and 13 are significantly different from FIGS. 2, 4, 6, 8 and 10 shown in the first to sixth embodiments in the shape of the coil electrode and the magnetic material, and the contact is annular. It is that.
[0096]
That is, in order to enhance the heat radiation effect of the heat generated by the electrodes, a concave portion 7a is formed on the top surface of a truncated cone formed at the tip of the movable-side energizing shaft 7A made of large-diameter oxygen-free copper, A convex portion at the lower end of the coil electrode 21D described below is inserted into this concave portion 7a and brazed.
[0097]
On the outer periphery of a shaft section 21e having a substantially U-shaped vertical section formed at the center of the coil electrode 21D, arm sections 21f are provided radially at 120 ° intervals so as to protrude in a direction orthogonal to the axial direction. An arc-shaped coil portion 21g is formed at the tip of the.
[0098]
At the tips of these coil portions 21g, connection arm portions 21h are formed at an acute angle to the center direction as shown in FIG. 13, and at the tip ends of these connection arm portions 21h, cylindrical connection parallel to the axis is formed. It is a part 21f.
On the front side of the coil electrode 21D, a magnetic material 19 made of mild steel described below is mounted as described below.
[0099]
In the magnetic body 19, arms 19b are formed radially at 120 ° intervals with respect to the outer circumference of the thin annular portion 19a placed on the front surface of the arms 21f of the coil electrode 21D. Are located substantially in the middle of each arm 21f of the coil electrode 21D as shown in FIG.
An arc-shaped portion 19c having substantially the same shape as the coil portion 21g formed on the coil electrode 21D is formed at the tip of each arm portion 19b.
[0100]
Inside the shaft portion 21e of the coil electrode 21D, a stainless steel reinforcing tube 20 having a cylindrical shape and flange portions formed at front and rear ends is inserted, and the front surface of the reinforcing tube 20 is connected to the coil electrode 21D. It is flush with the front end of the portion and the front end of the arcuate portion 19c of the magnetic body 19.
[0101]
An electrode plate 12 made of a copper plate is superimposed on the front side of the coil electrode 21D, the magnetic body 19, and the reinforcing tube 20, and the arc-shaped portion 19c of the magnetic body 19 and the connecting portion of the coil electrode 21D and the reinforcing tube 20 are formed. It is brazed to the front end face.
[0102]
A contact 23B made of a copper-chromium alloy and having a through hole 23d formed in the center is brazed on the front surface of the electrode plate 12 in advance. The inner and outer front sides of the contact 23B are chamfered in an arc shape.
[0103]
Next, the operation of the vacuum valve having such an electrode will be described with reference to the partially exploded perspective view of FIG. FIG. 14 shows a case in which a current flows from the movable contact to the fixed contact, and the directions of the current and the magnetic flux are indicated by arrows. Shows the magnetic flux passing through space.
[0104]
As shown in FIG. 14, the magnetic flux generated by the current flowing between the contacts flowing through the connection portion 21j of the coil electrode as shown by the arrow I is generated by the annular portion 19a, the arc-shaped portion 19c, and the arm portion 19b of the magnetic body 19. It passes through the formed magnetic path as shown by the arrow Φ.
[0105]
Of these, for example, the magnetic flux from the fixed-side annular portion 19a to the arc-shaped portion 19c is fixed via the respective arm portions 19b and the respective arc-shaped portions 19c of the movable-side magnetic body 19 opposed to the lower side of each arc-shaped portion 19c. Pass through the magnetic path to the side arm 19c.
Therefore, between the upper and lower arms 19c, an axial magnetic field having the same cross section as the arms 19c is formed.
[0106]
On the other hand, the annular portion 19aFor example, in the process of passing through the fixed-side annular portion 19a in the arrow direction, the magnetic flux passing through the fixed-side annular portion 19a reaches the movable-side annular portion 19a. In 19a, the direction of the magnetic flux is reversed from the fixed side to the movable side.
[0107]
FIG.147 is a graph showing a distribution of a magnetic field due to an axial magnetic flux generated by a magnetic body 19 indicated by a circle, a distribution of an axial magnetic field generated by a coil electrode, and a composite magnetic field thereof.
[0108]
As shown by a curved line b indicated by a broken line in FIG. 15, the axial magnetic flux between the arc-shaped portions 19c is distributed in an annular shape having the diameter of the arc-shaped portion 19c, and the axial magnetic flux between the annular portions 19a is an arc-shaped magnetic flux. The distribution shows the maximum value at the axis center part opposite to that between the parts.
A curve a obtained by combining the distribution curve c of the axial magnetic flux density generated by the coil electrode 21D with the curve b is the actual magnetic flux density of the vertical magnetic field generated between the contacts.
[0109]
Therefore, even in a vacuum bulb having such an electrode, the arc generated between the contacts can be generated on a wide surface near the outer periphery of the contacts, and is dispersed on a wide facing surface to prevent local concentration. Therefore, the breaking performance can be improved.
[0110]
FIG.IsFIG. 13 is a partial plan view showing an eighth embodiment of the vacuum valve of the present invention, in which only the coil electrode is shown, and the difference from FIGS. 12 and 13 is the shape of the connection portion, and the shape of the connection portion with the electrode plate is a coil. It is an oval parallel to the part.
[0111]
In this case, as compared with the coil electrode 21D shown in FIG. 12 and FIG. 13, the increase in the current-carrying cross-sectional area of the connection portion 21k can not only suppress a rise in temperature at the connection portion 21k, but also increase the temperature of the connection portion 21k. Can generate an axial magnetic flux in the same direction as the coil electrode and the arc-shaped portion 19c on the outer peripheral side of the connecting portion 21k, and can generate a magnetic flux in the opposite direction on the inner peripheral side of the connecting portion 21k. Therefore, the peaks and valleys of the distribution of the magnetic flux density shown by the curve a in FIG. 16 can be made more remarkable.
[0112]
In the above-described embodiment, the center of the magnetic body 19 is formed in an annular shape. However, in FIG. 14, the magnetic body 19 is divided into three parts by cutting each at the counterclockwise side of the base end of the arm part 19b, and each has an arc shape. The magnetic body may be curved to form a U-shaped magnetic path.
[0113]
In addition, a ceramic coating is applied to the back surface (coil electrode side) of the magnetic body 19 to insulate it from the coil electrode 21D.May increase.
[0114]
Furthermore, by applying a coating of copper or ceramic to the outer peripheral side surface of the magnetic body 19, an arc is transferred to the magnetic body 19 made of mild steel, and this magnetic body 19 melts and evaporates.May be prevented. Also, the through hole formed in the center of the contact 23D may be omitted depending on the rating of the vacuum valve.
[0115]
The radial positions of the connecting portions 21j and 21k shown in FIGS. 12, 13 and 15 may be 40% to 80% of the radius of the electrode.
Further, in each of the above embodiments, the case where the contact material is a copper-chromium alloy has been described, but W, Mo, Co, Fe, Ti and Nb alloy may be used instead of chromium.
[0116]
Next, FIG. 17 shows a ninth embodiment of the vacuum valve of the present invention.And, The vertical section of the central part of the vacuum valveFIG..
FIG. 17 differs from FIGS. 1, 12 and 13 shown in the first to seventh embodiments in that a mild steel cylindrical magnetic body 22 is provided between the insulating cylinder 1A and the arc shield 9D. And the shape of the contact.
[0117]
That is, the shield retainer 24 joined to the outer periphery of the arc shield 9D and having an L-shaped cross section and an insulating cylinder1A cylindrical magnetic body 22 is inserted between the inner circumference of A and a lower end thereof is brazed to a shield retainer 24.
[0118]
On the other hand, the contact 23E has a U-shape with a shallow vertical cross section. Therefore, the outer diameter of the electrode plate 12A and the magnetic body 19A is slightly smaller than that of the electrode plate 12 and the magnetic body 19 shown in FIG. I have.
A gentle slope is formed on the front side of the outer periphery of the contact 23E to prevent arc concentration at the end.
[0119]
In the vacuum valve configured as described above, a part of the magnetic flux generated at the outer peripheral portion of the fixed side electrode and the movable side electrode is passed through the magnetic body 22 so that a part of the arc generated between the contacts is reduced to the contact 23E. Can be moved between the gently inclined surfaces, so that the arc generated between the contacts can be further dispersed over a wide contact surface, and the breaking characteristics can be further improved.
[0120]
Next, FIG. 18 is a partial plan view showing a tenth embodiment of the vacuum valve of the present invention, and FIG. 19 is a sectional view taken along line KK of FIG.Is.
18 and 19, the difference from the electrodes shown in FIG. 2, FIG. 4, FIG. 6, FIG. 8, FIG. 10, FIG. 12 and FIG. The width is small, the axial length is long, and the magnetic tube 27A made of mild steel as shown in FIG. 20 is inserted into the inner peripheral surface of the coil portion.
[0121]
That is, a pair of arm portions 25b are formed symmetrically outward from the annular portion 25a in the coil electrode 25A in which the inner periphery of the annular portion 25a is brazed to the tip of the movable-side energized shaft 7C. Further, the coil portion 25c formed in an arc shape from the tip of the arm portion 25b has a smaller radial width than the coil electrode 21 of the third embodiment shown in FIGS. The direction is long, and a pair of coil portions 25c form a cylinder.
[0122]
A magnetic tube 27A having a relative magnetic permeability (μr) of 10 or more manufactured from a steel tube as shown in FIG. 20 is inserted into the coil electrode 25A with respect to the inner periphery of the coil portion 25c. Is attached. In the magnetic tube 27A, fitting portions 27a cut out as shown in FIG. 20 are formed on the left and right sides of the lower end in the cross-sectional direction of FIG. It is fitted to the arm 25b of the electrode 25A.
[0123]
On the other hand, a convex portion at the base end of the reinforcing tube 26 made of stainless steel (SUS304) is inserted into a concave portion formed at the convex portion at the distal end of the movable-side conducting shaft 7C and brazed. The back surface of the electrode plate 12 is brazed to the end surface of the reinforcing tube 26.
[0124]
A shaft of a T-shaped connector 25d is inserted and brazed at the tip of the coil portion 25c of the coil electrode 25A, similarly to the electrode shown in FIG. 32 of the related art. The electrode plate 12 and the contact 23F are sequentially brazed to the front surface of these connectors 25d.
[0125]
In the vacuum valve having such an electrode, of the magnetic flux generated by the current flowing through the coil portion 25c of the coil electrode 25A, the magnetic flux passing through the inside of the coil portion 25c in the axial direction is inserted into the inside. Through the magnetic tube 27A.
Therefore, since the magnetic flux density at the outer peripheral portion of the contact surface can be increased, similarly to the electrodes shown in FIGS. 2, 8 and 10, the magnetic field becomes maximum at the inner peripheral portion of the coil portion 25C in FIGS. An annular vertical magnetic field indicated by a curve B in the graph of FIG. 11 is formed between the electrodes.
[0126]
In this case, when the current carrying capacity is the same as that of the electrodes shown in FIGS. 2, 4, 6, 8 and 10, the inner diameter of the coil portion 25c is increased to increase the magnetic path of the longitudinal magnetic field. The diameter of the magnetic tube 27A can be increased, and the position of the annular top can be shifted in the outer peripheral direction as compared with the curve B in the graph of FIG. 3, which is described in the problem to be solved by the invention. The behavior of the arc at the time of interrupting a large current moving to the center of the contact can be more strongly prevented.
[0127]
Next, FIG. 21 is a partial longitudinal sectional view showing an eleventh embodiment of the vacuum valve of the present invention.Is.
The electrode shown in FIG. 21 is the same as FIGS. 18 and 19 except that the shape of the magnetic tube incorporated in the electrode shown in FIGS. 18 and 19 is different.
[0128]
That is, in the magnetic tube 27B shown in FIG. 21, a flange portion 27b formed annularly on the outside extends from the lower end of the magnetic tube 27A shown in FIGS. 18, 19 and 20. Therefore, the portion corresponding to the pair of fitting portions 27a formed at the lower end of the magnetic tube 27A shown in FIG. 20 is a fitting square hole through which the arm portion 25b of the coil electrode 25A penetrates.
[0129]
The magnetic tube 27B is assembled by inserting the arm 25b into the fitting square hole from the outer circumferential direction of the magnetic tube 27B at a stage before the arm 25b of the coil electrode 25A is brazed to the annular portion 25a. Assembling is performed by taking a step of brazing to the outer periphery of the annular portion 25a.
[0130]
In the vacuum valve having the electrodes as described above, similarly to the electrodes shown in FIGS. 18 and 19, not only can the diameter of the annular vertical magnetic field formed on the inner peripheral side of the coil portion 25c be increased, but also the diameter can be increased. Since the resistance of the magnetic path passing under the coil portion 25c can be reduced by the flange portion 27a, the strength of the vertical magnetic field can be further increased, and the arc extinguishing characteristics can be further improved.
[0131]
In the flange portion 27b formed at the lower end of the magnetic tube 27B, a portion corresponding to the arm portion 25b of the coil electrode 25A is omitted together with the fitting portion 27a shown in FIG. 20, and the coil electrode includes the annular portion 25a. It may be incorporated after being brazed to the movable-side conducting shaft 7C.
[0132]
Next, FIG. 22 is a partial longitudinal sectional view showing a twelfth embodiment of the vacuum valve of the present invention.Is.
FIG. 22 differs from the electrodes shown in the tenth and eleventh embodiments in that the shape of the magnetic tube incorporated in the electrode shown in FIG. 21 is partially changed. It is the same as the electrode shown by.
[0133]
That is, the magnetic tube 27C incorporated in the electrode shown in FIG. 22 has a slightly thinner front wall and a thicker flange portion 27b than the magnetic tubes 27A and 27B shown in FIGS. Has become. (Note: With a diameter of 50 mm and a height of 28 mm of the magnetic tube 27C manufactured by the inventors, a wall thickness of the rear end portion was set to 4 mm with respect to a thickness of the front end surface of 3 mm, and the cutoff test was performed.)
In the vacuum valve in which the electrode having the magnetic tube 27C is formed as described above, since the magnetic resistance in the middle part to the rear part of the electrode can be reduced as compared with the electrode shown in FIG. The strength of the vertical magnetic field can be further increased.
[0134]
Also, by slightly reducing the thickness of the tip portion as compared with the magnetic tube 27B shown in FIG. 21, the cross section generated between the electrodes has an annular longitudinal magnetic field as compared with the electrodes shown in FIG. Since the diameter of the ring can be further increased, the transition phenomenon of the arc to the central portion at the time of interruption of a large current can be further suppressed as compared with the vacuum valve incorporating the electrode shown in FIG.
The method of reducing the thickness of the distal end of the thickness of the magnetic body as compared with the base end may be applied to the magnetic tube 27A shown in FIGS.
[0135]
Next, FIG. 23 is a partial plan view showing a thirteenth embodiment of the vacuum valve of the present invention, and FIG. 24 is a longitudinal sectional view of FIG.And contactAnd the electrode plate are also shown in cross section.
[0136]
The electrodes shown in FIGS. 23 and 24 are similar to the electrodes shown in FIGS. 18, 19 and 20, and the difference from FIGS. 18 and 19 is the shape of the contact and the electrode plate.
That is, as the contact 23D, a contact 23D having a through-hole 23d formed in the center is employed, similarly to the contact of FIG. 12 showing the seventh embodiment, and brazing is performed on the back surface of the contact 23D. A through hole is also formed in the center of the electrode plate 12B thus formed.
[0137]
However, since these through holes have a larger diameter than the through holes formed in the contact of FIG. 12, the reinforcing tube 26A brazed to the center of the back surface of the electrode plate 12B also has The inner and outer diameters are slightly larger than those of the reinforcing pipe 26 shown in FIGS. 19, 21, and 22, and the lower end is fitted and brazed to the outer periphery of the convex portion at the tip of the movable-side conducting shaft 7C. I have.
[0138]
In the vacuum valve having the electrodes as described above, the number of contact points at the time of energization is three or more, so that the contact area increases, the current density at the energization point can be reduced, and the energization capacity can be increased. In addition, since it is possible to completely prevent the arc from shifting to the central portion when a large current is interrupted, it is possible to obtain a stable interrupting characteristic.
[0139]
Next, FIG. 25 is a partial perspective view showing a fourteenth embodiment of the vacuum valve of the present invention.And figure 19 ,The difference is that the reinforcing tube incorporated in the electrode shown in FIGS. 21, 22, and 23 has a tubular shape, whereas a copper material is inserted inside the tubular reinforcing tube.
[0140]
Of these, the outer reinforcing tube 26B has an inverted U-shaped vertical cross section (not shown), and the lower end is open. A core material 26a made of a copper bar is inserted into the inside of the reinforcing tube 26B.
[0141]
In the vacuum valve in which the electrode thus formed is incorporated, an eddy current flows through the core material 26a due to a magnetic flux passing through the center of the electrode, and the magnetic flux generated by the eddy current causes the coil electrode to generate an eddy current. Since the magnetic flux generated at the center can be reduced, the movement of the arc to the center of the electrode can be prevented.
[0142]
Next, FIG. 26 is a partial perspective view showing a fifteenth embodiment of the vacuum valve of the present invention.Is. FIG. 26 shows reinforcing pipes 26 and 26A assembled from the electrodes of FIGS. 18 and 19 shown in the ninth embodiment to the electrodes of FIGS. 23 and 24 shown in the twelfth embodiment. A reinforcing pipe 26C made of a copper material having a spiral groove formed on the outer periphery is shown.
[0143]
In other words, the plurality of grooves 26b spirally formed with respect to the outer periphery of the reinforcing tube 26C is such that the magnetic flux generated by the current flowing through the spiral electric path between these grooves 26b is generated at the coil electrode. It is formed in a direction opposite to the magnetic flux inside the coil electrode.
[0144]
In a vacuum valve in which such a reinforcing tube is incorporated, the magnetic flux in the axial direction at the center of the electrode can be reduced. Therefore, the strength of the longitudinal magnetic field at the center of the concave section shown by the curve a in the graph of FIG. Can be further reduced, and the transfer of the arc generated between the electrodes to the center of the contact can be more strongly prevented.
[0145]
FIG. 27 is a partial perspective view showing a sixteenth embodiment of the vacuum valve of the present invention.Is.
In FIG. 27, a spiral groove 26c is formed at the tip of the movable-side energizing shaft 7D.
[0146]
That is, in FIG. 26 showing the fifteenth embodiment, a helical groove is formed in the reinforcing pipe 26C as a means for generating a magnetic flux generated in the coil electrode and opposite to the magnetic flux inside the coil electrode. As described in the example, in FIG. 27, a groove 26c is formed on the outer periphery of the leading end of the conducting shaft 7D, and the intensity of the axial magnetic field in the central portion between the electrodes is increased by the current flowing on the outer peripheral surface between the grooves 26c. Generates a magnetic flux that decreases.
In this case, the tip of the energization shaft may be solid as in the conventional case, or may be tubular as the reinforcing tube 26C in FIG.
[0154]
【The invention's effect】
Thus, claim 1According to the invention described in the above, the coil electrode is connected to the front end of the current-carrying shaft inserted through the inside of the insulating cylinder from both ends of the insulating cylinder, and the contact is joined to the front surface of the coil electrode via a connection portion. In the valveIt has a U-shaped part in the cross-sectional shape orthogonal to the axial direction.U-shapeDepartmentThe magnetic material on the open side of the fixed-side magnetic body at the open end of the fixed-side magnetic body is caused by the magnetic flux generated at the coil electrode and passing through the magnetic body by interposing a magnetic body between the coil electrode and the contact where the connection part fits loosely inside The vertical magnetic field between the arm of the body, the vertical magnetic field between the arm of the fixed magnetic material at the open end of the magnetic material on the movable side, and the vertical magnetic field between the opposed portions of the U-shape. FormingPrevent the longitudinal magnetic field generated at the electrode from concentrating on the center of the electrode,Quickly extinguishes arc between contactsDoTherefore, it is possible to obtain a vacuum valve capable of improving the cutoff characteristics.
[0155]
Claims2According to the invention described in (1), the connection portion extends inside the tip of the coil portion in a direction opposite to the coil portion of the coil electrode, thereby generating the connection portion in the opposite direction.DoDue to the magnetic flux, the intensity of the vertical magnetic field in the central portion between the contacts is further reduced,Prevents the longitudinal magnetic field generated at the electrode from concentrating on the center of the electrode,Since the arc is suppressed in a short time by suppressing the occurrence of arc at the center of the contact, it is possible to obtain a vacuum valve capable of improving the cutoff characteristics.
[0156]
Claims3According to the invention described in the above, by forming a ceramic coating on the surface of the magnetic body on the side of the coil electrode, it is possible to prevent a current passing through the magnetic body.Prevents the longitudinal magnetic field generated at the electrode from concentrating on the center of the electrode,Prevents a decrease in the strength of the vertical magnetic field and occurs between contactsDoArc extinguishing in a short timeDoTherefore, it is possible to obtain a vacuum valve capable of improving the cutoff characteristics.
[0157]
Claims4According to the invention described in the above, by forming a copper or ceramic coating on the outer peripheral side surface of the magnetic body,Prevents the longitudinal magnetic field generated at the electrode from concentrating on the center of the electrode,Prevents evaporation due to the arc transferred to the outer periphery of the magnetic body and deterioration of the interruption performance, and occurs between contactsDoArc extinguishing in a short timeDoTherefore, it is possible to obtain a vacuum valve capable of improving the cutoff characteristics.
[0158]
Claims5According to the invention described in (1), by making the contact annular,Prevents the longitudinal magnetic field generated at the electrode from concentrating on the center of the electrode,Prevents arcing at the center of contacts and occurs between contactsDoArc extinguishing in a short timeDoTherefore, it is possible to obtain a vacuum valve capable of improving the cutoff characteristics.
[0159]
Claims6According to the invention described in (1), the contact is formed in a U-shaped vertical cross section for housing the magnetic body inside, and the cylindrical magnetic body is provided between the inner circumference of the insulating cylinder and the arc shield inside the insulating cylinder. By providingPrevents the longitudinal magnetic field generated at the electrode from concentrating on the center of the electrode,Increases the arc generation area on the contact surface, reduces the arc density and generates between the contactsDoArc extinguishing in a short timeDoTherefore, it is possible to obtain a vacuum valve capable of improving the cutoff characteristics.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a vacuum valve of the present invention.
FIG. 2 is an enlarged detailed longitudinal sectional view showing a main part of FIG.
FIG. 3 is a graph showing the operation of the first embodiment of the vacuum valve of the present invention.
FIG. 4 is a longitudinal sectional view showing a second embodiment of the vacuum valve of the present invention.
FIG. 5 is a graph showing the operation of the second embodiment of the vacuum valve of the present invention.
FIG. 6 is a longitudinal sectional view showing a third embodiment of the vacuum valve of the present invention.
FIG. 7 is a sectional view taken along line DD of FIG. 6;
FIG. 8 is a longitudinal sectional view showing a fourth embodiment of the vacuum valve of the present invention.
FIG. 9 is a longitudinal sectional view showing a fifth embodiment of the vacuum valve of the present invention.
FIG. 10 is a longitudinal sectional view showing a sixth embodiment of the vacuum valve of the present invention.
FIG. 11 is a graph showing the operation of a sixth embodiment of the vacuum valve of the present invention.
FIG. 12 is a longitudinal sectional view showing a seventh embodiment of the vacuum valve of the present invention.
FIG. 13 is a sectional view taken along the line HH of FIG. 12;
FIG. 14 is a partial perspective view showing the operation of a seventh embodiment of the vacuum valve of the present invention.
FIG. 15 is a graph showing the operation of the seventh and eighth embodiments of the vacuum valve of the present invention.
FIG. 16 is a partial plan view showing an eighth embodiment of the vacuum valve of the present invention.
FIG. 17 is a partial longitudinal sectional view showing a ninth embodiment of the vacuum valve of the present invention.
FIG. 18 is a partial plan view showing a tenth embodiment of the vacuum valve of the present invention.
FIG. 19 is a sectional view taken along the line KK of FIG. 18;
20 is a partially reduced view of FIG. 19, wherein a left side is a bottom view and a right side is a right side view of the left side.
FIG. 21 is a partial longitudinal sectional view showing an eleventh embodiment of the vacuum valve of the present invention.
FIG. 22 is a longitudinal sectional view showing a twelfth embodiment of the vacuum valve of the present invention.
FIG. 23 is a partial plan view showing a thirteenth embodiment of the vacuum valve of the present invention.
FIG. 24 is a longitudinal sectional view of FIG. 6;
FIG. 25 is a partial perspective view showing a fourteenth embodiment of the vacuum valve of the present invention.
FIG. 26 is a partial perspective view showing a fifteenth embodiment of the vacuum valve of the present invention.
FIG. 27 is a partial perspective view showing a sixteenth embodiment of the vacuum valve of the present invention.
FIG. 28 is an exploded perspective view showing a main part of a conventional vacuum valve.
FIG. 29 is a graph showing the operation of a conventional vacuum valve.
FIG. 30 is a longitudinal sectional view showing a main part of the conventional vacuum valve, which is different from FIG. 28;
FIG. 31 is a sectional view taken along line GG of FIG. 14;
FIG. 32 is a partial longitudinal sectional view showing a main part of the conventional vacuum valve, which is different from FIGS. 28 and 30;
FIG. 33 is a graph showing an operation of a conventional vacuum valve different from that of FIG. 29;
[Explanation of symbols]
1, 1A: insulating cylinder, 2A: fixed end plate, 2B: movable end plate, 3: vacuum vessel, 4: fixed electrode, 5, 5A: movable electrode, 6: fixed-side conducting shaft, 7, 7A , 7C: movable side conducting shaft, 8: bellows, 9A, 9B, 9C: arc shield, 10: bush, 12, 12A: electrode plate, 19: magnetic body, 19a: annular portion, 19b: arm portion, 19c: arc shape Part, 20 ... reinforcement pipe, 21, 21D, 21E ... coil electrode, 21j, 21k ... connection part, 23, 23A, 23C ... arc electrode, 23B, 23D, 23E ... contact, 25A ... coil electrode, 25c ... coil part , 25b ... arm, 26, 26A, 26B ... reinforcement pipe, 26C ... reinforcement rod, 26a ... core material, 27A, 27B, 27C ... magnetic tube, 30 ... support, 31, 31A, 31A1, 31B, 31C ... magnetic body , 31D ... Fixing bracket, 32 32A ... support plate.

Claims (6)

From the both ends of the insulating cylinder to the tip of the current-carrying shaft axially penetrated into the inside of the insulating cylinder, a coil electrode and a contact are joined via a connection part on the front surface of the coil electrode, and the coil electrode is In a vacuum valve having an arm portion formed in a direction perpendicular to the axial direction of the energizing shaft and an arc-shaped coil portion formed at a tip of the arm portion , a U-shaped portion is formed in a cross-sectional shape orthogonal to the axial direction. A vacuum valve, wherein a magnetic body in which the connection portion is loosely fitted inside the U-shaped portion is interposed between the coil electrode and the contact. 2. The vacuum valve according to claim 1, wherein the connecting portion extends inside a tip end of the coil portion opposite to a side on which the arm portion is formed . 3. 3. The vacuum valve according to claim 1, wherein a ceramic coating is formed on a surface of the magnetic body on the side of the coil electrode. The vacuum valve according to any one of claims 1 to 3, wherein a coating of copper or ceramics is formed on an outer peripheral side surface of the magnetic body. The vacuum valve according to any one of claims 1 to 4, wherein the contact has an annular shape. The contact has a U-shaped vertical cross section for housing the magnetic body inside, and a cylindrical magnetic body is provided between the inner periphery of the insulating cylinder and an arc shield inside the insulating cylinder. vacuum valve according to any one of claims 1 to 5, characterized in.

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