CN1205534A - Vacuum breaker - Google Patents
Vacuum breaker Download PDFInfo
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- CN1205534A CN1205534A CN 98103323 CN98103323A CN1205534A CN 1205534 A CN1205534 A CN 1205534A CN 98103323 CN98103323 CN 98103323 CN 98103323 A CN98103323 A CN 98103323A CN 1205534 A CN1205534 A CN 1205534A
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- electric arc
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- arc groove
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Abstract
The invention relates to a vacuum circuit breaker, especially relates to a vacuum circuit breaker provided with an electrode having an electric arc groove. In the vacuum circuit breaker of the invention, an electric arc generated on the electrode is magnetic drived on a peripheral end side surface of the electrode to enhance a circuit breaking performance of the electrode, thereby, a radial component of an electromagnetic force acting on the electric arc is configured as a portion of a biggest electrode in an outside conductor direction. In this way, even if when the electric arc generated between the electrodes is shifted on the electrode, the electric arc would not be stayed on the electrode by moving the electrode along the peripheral edge of the electrode, so as to restrain metal melting on the surface of the electrode and the consumption of the electrode, and increase the circuit breaking performance.
Description
The present invention relates to vacuum circuit-breaker, particularly relate to the vacuum circuit-breaker that is provided with the electrode that has the electric arc groove.
In vacuum circuit-breaker,, connect and open circuit by connecting disjunction pair of electrodes of configuration relatively in vacuum tube.Generally, movable rod is moved up and down with respect to fixed lever, make the electrode on the end that is located at each bar connect disjunction, connect and open circuit by being located at the outer operating mechanism of vacuum tube.
And, when the vacuum circuit breaker opens circuit, between electrode, produce electric arc.When this electric arc is stuck in two interelectrode certains, because because of the heat from electric arc makes the temperature of electrode surface rise, and cause metal melting.Therefore, when this phenomenon took place, the consumption of electrode increased sharply, owing to there is superfluous metallic between electrode, opening performance significantly reduces.
Therefore, in existing vacuum circuit-breaker, the problem that the electric arc when cutting off above-mentioned electric current in order to solve takes place, the electrode that has at vacuum circuit-breaker textural carried out various processing.
For example, by spiral helicine spiral-shaped electric arc groove is set on arc electrodes, come to provide along the magnetic actuating force of the direction of rotation of electric arc groove by the electric current that flows through electrode to the electric arc that takes place, and electric arc is constantly moved between two electrodes, by adopting this structure, electric arc can not be stuck in the somewhere of electrode, suppresses the long metal melting on the electrode surface, suppress the consumption of electrode, can improve opening performance thus.
But, have in the vacuum circuit-breaker of electrode of spiral-shaped electric arc groove in existing use, under the vacuum circuit breaker was small-sized situation, the magnetic field by the electric current that flows through external conductor takes place made the electric arc that produces between electrode be subjected to the effect of electromagnetic force.
Its result, the effective area that promptly move in the zone that electric arc moves on electrode has reduced, and the problem that opening performance reduces can take place.
The purpose of this invention is to provide a kind of vacuum circuit-breaker, magnetic driven arc improves opening performance so that move along the periphery of electrode energetically.
To achieve these goals, in the present invention, a kind of vacuum circuit-breaker is provided, comprise: be configured in the interior electrode of above-mentioned vacuum tube, extend to the bar outside the vacuum tube, the external conductor that is connected with bar from the electrode the inside with electric arc groove, it is characterized in that, when the electric arc that produces is mobile on electrode, the position that radially becomes to be divided on the maximum electrode that acts on the electromagnetic force on the electric arc is configured on the external conductor direction.
To achieve these goals, in vacuum circuit-breaker of the present invention, it is characterized in that, dispose from the periphery top of electric arc groove corresponding to the external conductor direction and pass through the adjacent electrode zone of electric arc groove, as the position on the electrode that radially becomes to be divided into maximum that acts on the electromagnetic force on the electric arc.
To achieve these goals, in vacuum circuit-breaker of the present invention, it is characterized in that, corresponding to the external conductor direction dispose the top that is clipped in the electric arc groove, near the end of the electrode inboard of the electric arc groove direction of rotation that is positioned at the electric arc groove, with the intersection point of the corresponding wiring of electric arc groove by this end and electrode periphery among part, as the position on the electrode that radially becomes to be divided into maximum that acts on the electromagnetic force on the electric arc.
To achieve these goals, in vacuum circuit-breaker of the present invention, it is characterized in that in vacuum tube, having one group of electrode, the position that radially becomes to be divided on the maximum electrode that acts on the electromagnetic force on the electric arc is configured in respectively on the external conductor direction.
To achieve these goals, in the present invention, a kind of vacuum circuit-breaker is provided, comprise: be configured in the interior electrode of above-mentioned vacuum tube, extend to the bar outside the vacuum tube, the external conductor that is connected with bar from the electrode the inside with electric arc groove, it is characterized in that, corresponding to external conductor dispose the top that is clipped in the electric arc groove, near the end of the electrode inboard of the electric arc groove direction of rotation that is positioned at the electric arc groove, with the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery among part.
To achieve these goals, in vacuum circuit-breaker of the present invention, it is characterized in that, near the end of the electrode inboard of the electric arc groove the direction of rotation that make the top that is clipped in the electric arc groove, is positioned at the electric arc groove, with the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery among part, with respect to staggering in the clockwise direction or counterclockwise, come the electromagnetic force of corrective action on electric arc.
To achieve these goals, in vacuum circuit-breaker of the present invention, it is characterized in that, from the axial central part of external conductor along clockwise direction or the top that is clipped in the electric arc groove is set in the scopes of anticlockwise 30 degree, near the end of the electrode inboard of the electric arc groove direction of rotation that is positioned at the electric arc groove, with the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery among part.
To achieve these goals, in vacuum circuit-breaker of the present invention, it is characterized in that, in vacuum tube, have one group of electrode, the top that respectively is clipped in the electric arc groove, be positioned near the electrode inboard of the electric arc groove the direction of rotation of electric arc groove the end, be configured in respectively on the external conductor direction with part among the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery.
To achieve these goals, in vacuum circuit-breaker of the present invention, it is characterized in that near the end of the electrode inboard of the electric arc groove the direction of rotation that make the top that respectively is clipped in the electric arc groove, is positioned at the electric arc groove, consistent with each other between each electrode with the part among the intersection point of the corresponding wiring of electric arc groove of passing through this end and electrode periphery.
To achieve these goals, in vacuum circuit-breaker of the present invention, it is characterized in that, the top that is equivalent to respectively be clipped in the electric arc groove, be positioned near the electrode inboard of the electric arc groove the direction of rotation of electric arc groove the end, with the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery among the position of part on mark is set, on this label orientation, draw external conductor.
These and other purpose, advantage and feature of the present invention will be in conjunction with the drawings to the description of embodiments of the invention and further specified.In these accompanying drawings:
Fig. 1 is the perspective view of the electrode seen of the A-A line from Fig. 2 of one embodiment of the present of invention;
Fig. 2 is the sectional drawing of the vacuum tube of one embodiment of the present of invention;
The plane graph that magnetic when Fig. 3 is explanation with respect to the outer electrode of the corresponding allocation plan 1 of external conductor drives;
The plane graph that magnetic when Fig. 4 is explanation with respect to external conductor with the outer electrode of mobile Fig. 1 counterclockwise drives;
The plane graph that magnetic when Fig. 5 is explanation with respect to external conductor with the outer electrode of mobile Fig. 1 counterclockwise drives;
Fig. 6 is explanation with respect to the external conductor plane graph that drives of the magnetic the during outer electrode of mobile Fig. 1 in a clockwise direction;
Fig. 7 is explanation with respect to the external conductor plane graph that drives of the magnetic the during outer electrode of mobile Fig. 1 in a clockwise direction;
To be expression move the performance plot of the relation of the angle of electrode of Fig. 1 and opening performance with respect to external conductor to Fig. 8;
Fig. 9 is the plane graph of the electrode shape of expression an alternative embodiment of the invention;
Figure 10 is the perspective view of a part of the vacuum tube of expression an alternative embodiment of the invention;
Figure 11 is the perspective view of a part of the vacuum tube of expression an alternative embodiment of the invention.
The following describes Fig. 1 to Figure 11 embodiments of the invention are described.
Fig. 2 is the figure that the vertical section of the vacuum circuit-breaker of expression one embodiment of the present of invention is constructed.
Vacuum tube 1 is provided with seal fitting 3 in the end of the insulating cylinder 2 of ceramic component, comes its inside of vacuum seal.Corresponding configuration fixed lever 4 and movable rod 5 in vacuum tube 1.Fixed lever 4 is fixed on the seal fitting 3A.Movable rod 5 is kept by bellows 6 and seal fitting 3B, and movable rod 5 can move in the axial direction by bellows 6.Shielding 11 is configured in the outside of two electrodes 8,9, is supported on the insulating cylinder 2.External conductor 7 extends on the right angle orientation that is installed in two bars 4,5 on fixed lever 4 and the movable rod 5.
Fixed electrode 8, the movable electrode 9 be made up of Cu-Pb alloy etc. for example are set respectively on the top of fixed lever 4 and movable rod 5.
When this fixed electrode 8 separates with movable electrode 9 when opening circuit, between this two electrode, produce electric arc A.When this electric arc A concentrates on certain of two electrodes 8,9 and during the starting the arc, the surface temperature of two electrodes 8,9 rises and causes metal melting, therefore, needs to give electric arc A provide actuating force so that it constantly moves.For this reason, many electric arc grooves 10 (in this embodiment, being 3 electric arc groove 10A, 10B, 10C) being set on two electrodes 8,9 provides the magnetic actuating force for electric arc A.
Use Fig. 1 and Fig. 2 to come the electromagnetic force that acts on the electric arc A is described below.
By the magnetic field that the electric current that flows through two electrodes 8,9 produces, make have electrode radially the electromagnetic force F2 of composition act on the electric arc A.When this electromagnetic force F2 passes through the top 10E of electric arc groove 10A, that is, when electric arc A was mobile in triangle portion S, this electromagnetic force F2 became maximum.Near the end 10D of the electrode inboard of the electric arc groove 10B of the direction of rotation that this triangle portion S is the top 10E that is clipped in electric arc groove 10A, be arranged in electric arc groove 10A, with the zone of 3 points (10D, 10E, 10F) of the intersection point 10F of corresponding wiring L1 of electric arc groove by end 10D and electrode periphery.Thus, electric arc constantly moves on outer peripheral portion.
On the other hand, by the caused electromagnetic force F1 of the Lorentz force that electric current produced that flows through external conductor 7, in the device of Fig. 2 constitutes, constantly left in the drawings upwards acts on the electric arc A, when electric arc A moved to apart from the nearest position P of external conductor shown in Figure 17, this electromagnetic force F1 became maximum.
Like this, when when the electric arc that produces between electrode is mobile on electrode, the zone of the top 10E of the electric arc groove 10A on the position that is divided into by the radially one-tenth that is in the electromagnetic force F2 that acts on this electric arc on the maximum electrode, promptly, the top 10E that is clipped in electric arc groove 10A, be positioned near the end 10D of electrode inboard of electric arc groove 10B of the direction of rotation of electric arc groove 10A, 3 point (10D with the intersection point 10F of corresponding wiring L1 of electric arc groove by end 10D and electrode periphery, 10E, the triangle portion S correspondence in the zone 10F) is configured on the nearest position of external conductor 7, thus, even when the electric arc that takes place between electrode is mobile on electrode, describe bigger spiral (electric arc is along the periphery of electrode during maximum) by magnetic driven arc, and in time per unit, on electrode, move with long distance, thus, electric arc can not be stuck on the electrode, and suppressed the metal melting of electrode surface, can suppress the consumption of electrode and improved opening performance.
Use Fig. 3 to Fig. 7 to illustrate below: electromagnetic force F1 when being positioned at a some P and the relation of electromagnetic force F2 for electric arc A, the embodiment of change when electrode centers extends to the straight line L2 of mid point on limit (10E, 10F) of triangle portion S and angle θ that external conductor 7 constitutes, the opening performance in the curve chart of Fig. 8 during θ=0 ° compares its effect respectively as 1.
1. during θ=0 °
As shown in Figure 3, the triangle portion S and external conductor 7 corresponding configurations of the radially composition that acts on the electromagnetic force F2 on the electric arc for the position on the maximum electrode.Greater than electromagnetic force F1, that is, has the relation of electromagnetic force F2＞electromagnetic force F1 by the electromagnetic force F2 that electric current produced that flows through two electrodes 8,9.Because electric arc A is crushed on the electromagnetism outer circumference end 9E, carry out magnetic along electrode outer circumference end side surface and drive, therefore as shown in Figure 8, opening performance improves.
2. during θ=30 °
Be that the such triangle portion S of Fig. 4 counterclockwise moves 30 ° situation from the center line 0 of movable rod 5.Electromagnetic force F2 equals electromagnetic force F1 or strong slightly, promptly become the relation of electromagnetic force F1≤electromagnetic force F2, therefore, compare during with θ=0 °, electric arc A is driven into distolateral inboard slightly of electrode periphery by magnetic, therefore, and spiral when electric arc A depicts less than θ=0 ° or circumference and advance, therefore, the forward travel distance of the electric arc of time per unit shortens.As shown in Figure 8, compare the electric arc stagnation that becomes, then opening performance variation slightly during with θ=0 °.
3. during θ=60 °
Be that the such triangle portion S of Fig. 5 counterclockwise moves 60 ° situation from the center line 0 of movable rod 5.The relation of electromagnetic force F2 and electromagnetic force F1 becomes electromagnetic force F2 and is weaker than the relation that electromagnetic force F1 is electromagnetic force F1＞electromagnetic force F2.Compare during with θ=30 °, be pressed into less two electrodes, 8,9 inboards of actuating force, and stagnate at two electrodes, 8,9 central portions, because the spiral that electric arc is described or the size of circumference diminish, then the forward travel distance of the electric arc of time per unit shortens, and as shown in Figure 8, compares during with θ=30 °, the opening performance variation trends towards and can not use.
4. during θ=-30 °
Identical during with θ=30 ° during θ=-30 °.As shown in Figure 6, the serve as reasons electromagnetic force F2 that electric current produced that flows through triangle portion S of the triangle portion S relation that moves locational electromagnetic force F2, the electromagnetic force F1 of 30 ° (30 °) from center line 0 clockwise direction of external conductor 7 equates or is slightly by force the relation of electromagnetic force F1≤electromagnetic force F2 with electromagnetic force F1.
Be driven into electromagnetism outer circumference end 9E inboard owing to compare magnetic when electric arc A and θ=0 °, then as shown in Figure 8, opening performance is variation slightly, but still can be as practical and use.
5. during θ=-60 °
Identical during with θ=60 ° during θ=-60 °.As shown in Figure 7, triangle portion S moves the locational electromagnetic force F2 of 60 ° (60 °) with respect to external conductor 7 clockwise directions and the pass of electromagnetic force F1 is that electromagnetic force F2 is weaker than the relation that electromagnetic force F1 is electromagnetic force F1＞electromagnetic force F2.Compare during with θ=-30 °, be pressed into less two electrodes, 8,9 inboards of actuating force, and stagnate at two electrodes, 8,9 central portions, because the spiral that electric arc is described or the size of circumference diminish, then the forward travel distance of the electric arc of time per unit shortens, and as shown in Figure 8, compares during with θ=-30 °, the opening performance variation, and can not use.
Like this, according to the present invention, when the triangle portion S of electric arc groove 10 during, when θ=0 with external conductor 7 corresponding configurations, relation with electromagnetic force F2＞electromagnetic force F1, it is distolateral by electromagnetic force F2 electric arc A to be pressed onto the electrode periphery, carries out magnetic along electrode outer circumferential side surface and drives, therefore, as shown in Figure 8, can significantly improve opening performance, vacuum tube 1 of the present invention with triangle portion S is not compared with the prior art of external conductor 7 corresponding configurations, can make the shape miniaturization of electrode.
Owing to can reduce influence from external conductor, just can electrode 8 be set near external conductor 7, can make all formation miniaturizations of vacuum circuit-breaker that comprise bar 4,5.
And, if stagger in a clockwise direction or counterclockwise and the external conductor 7 corresponding angles that dispose triangle portion S, just can adjust electromagnetic force F2, therefore, just can on the optional position on the electrode outer surface, carry out the magnetic driving to electric arc A.
And, if make triangle portion S be positioned at from the angle of external conductor 7 corresponding configurations in the clockwise direction 30 ° and anticlockwise-30 ° of scopes, can not damage opening performance, can access stable opening performance.
In the above-described embodiment, the situation that the electric arc groove is set on two electrodes is illustrated, still, also can be used for being provided with the electrode of electric arc groove a side.
The electrode that is provided with the electric arc groove is being used for fixing under the situation of electrode 8 and movable electrode 9, direction consistent the comparing between two electrodes that radially becomes to be divided into the triangle portion S at the position on the maximum electrode with making the electromagnetic force F2 that acts on the electric arc obtained good effect.
Under the electrode shape of an above-mentioned embodiment, though specified: as the zone on the electrode that radially becomes to be divided into maximum that acts on the electromagnetic force F2 on the electric arc, from the zone of electric arc groove 10A, becoming maximum near adjacent screw electrode, particularly, specified the top 10E that is clipped in electric arc groove 10A, be positioned near the end 10D of electrode inboard of electric arc groove 10B of the direction of rotation of electric arc groove 10A, 3 point (10D with the intersection point 10F of corresponding wiring L1 of electric arc groove by end 10D and electrode periphery, 10E, the triangle portion S in the zone 10F), but, what this acted on electromagnetic force F2 on the electric arc radially becomes to be divided into spiral-shaped relevant that zone and electrode on the maximum electrode has, under the screw electrode shape except that the foregoing description, also exist in the inapplicable situation of definition of the triangle portion S of appointment among this embodiment, but, even such screw electrode shape, can wait next zone on the electrode that radially becomes to be divided into maximum of specifying the electromagnetic force F2 that acts on the electric arc on the electrode by the electromagnetic field parsing, externally dispose this zone on the conductor direction, thus, obtain effect same as the previously described embodiments.
For example, Fig. 9 has represented an alternative embodiment of the invention.Be to have the spiral-shaped electrode different with the electrode of the foregoing description.In this electrode,, can not intactly use the definition of the triangle portion S of the foregoing description explanation as the zone on the electrode that radially becomes to be divided into maximum that acts on the electromagnetic force on the electric arc.
Even in this embodiment, identical with the embodiment of above-mentioned electrode as shown in the figure, from the zone of top 20 of electric arc groove 10A, there is the region S 2 that radially becomes to be divided into maximum of the electromagnetic force that acts on the electric arc near adjacent screw electrode.But, different with the definition of the region S of the foregoing description, this region S 2 defined the electrode inboard of electric arc groove 10B end 20D, with corresponding wiring L1 of electric arc groove by end 20D and the intersection point 20G of electric arc groove 10B, defined the wiring L4 in the electric arc groove of this intersection point 20G and the intersection point 20F of electrode periphery, the region S 2 that is clipped between the top 20E of these intersection points 20G, 20F and electric arc groove 10A can define.When electric arc is mobile in this region S 2, the radially one-tenth that acts on the electromagnetic force on the electric arc is divided into maximum, this zone correspondence be configured in external conductor 7 proximal most position on, thus, even under situation about moving on the electrode, electric arc is described the electrode peripheral part and is moved at the electric arc that produces between electrode.
The embodiment of Figure 10 represents to be easy to the formation that radially becomes to be divided into the triangle portion S at the position on the maximum electrode that configuration on the conductor direction externally acts on the electromagnetic force on the electric arc.
Being equivalent to provide S ' to be used as mark on the position of the fixing triangle portion S of the clamp nut 15 of six prisms of fixed lever 4, external conductor 7 is extended to mark S ' side, and the installation mistake when having prevented assembling.
Figure 11 is: on the position that is being equivalent to triangle portion S on the outer end on the bar 4,5 step is set, step is served as a mark provides S ', perhaps, step can only be set, and just can reach the effect identical with Figure 10.
As described above, according to vacuum circuit-breaker of the present invention, when corresponding configuration triangle portion S with external conductor 7, the electromagnetic force F2 of electrode side is better than the electromagnetic force F1 that is produced by external conductor, electric arc A be forced into the electrode periphery distolateral on, carrying out magnetic along electrode outer circumference end side surface drives, therefore, as shown on Fig. 8 like that, can significantly improve opening performance, vacuum tube 1 of the present invention is not compared with the prior aries of corresponding with external conductor 7 configuration triangle portion S, can make the electrode shape miniaturization.
Owing to can constitute electrode near external conductor, just can make all formation miniaturizations of vacuum circuit-breaker.
Claims (10)
1 ,-and kind of vacuum circuit-breaker, comprise
Be configured in electrode in the above-mentioned vacuum tube with electric arc groove,
Extend to from electrode the inside bar outside the vacuum tube,
The external conductor that is connected with bar,
It is characterized in that,
When the electric arc that produces is mobile on electrode, the position that radially becomes to be divided on the maximum electrode that acts on the electromagnetic force on the electric arc is configured on the external conductor direction.
2, vacuum circuit-breaker according to claim 1 is characterized in that, disposes from the periphery top of electric arc groove corresponding to the external conductor direction and passes through the adjacent electrode zone of electric arc groove.As the position on the electrode that radially becomes to be divided into maximum that acts on the electromagnetic force on the electric arc.
3, vacuum circuit-breaker according to claim 1 and 2, it is characterized in that, corresponding to the external conductor direction dispose the top that is clipped in the electric arc groove, near the end of the electrode inboard of the electric arc groove direction of rotation that is positioned at the electric arc groove, with the intersection point of the corresponding wiring of electric arc groove by this end and electrode periphery among part, as the position on the electrode that radially becomes to be divided into maximum that acts on the electromagnetic force on the electric arc.
4, according to each described vacuum circuit-breaker of claim 1 to 3, it is characterized in that,
In vacuum tube, have-organize electrode,
The position that radially becomes to be divided on the maximum electrode that acts on the electromagnetic force on the electric arc is configured in respectively on the external conductor direction.
5 ,-and kind of vacuum circuit-breaker, comprise
Be configured in electrode in the above-mentioned vacuum tube with electric arc groove,
Extend to from electrode the inside bar outside the vacuum tube,
The external conductor that is connected with bar,
It is characterized in that,
Corresponding to external conductor dispose the top that is clipped in the electric arc groove, near the end of the electrode inboard of the electric arc groove direction of rotation that is positioned at the electric arc groove, with the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery among part.
6, vacuum circuit-breaker according to claim 5, it is characterized in that, near the end of the electrode inboard of the electric arc groove the direction of rotation that make the top that is clipped in the electric arc groove, is positioned at the electric arc groove, with the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery among part, with respect to external conductor clockwise direction or counterclockwise on stagger, come the electromagnetic force of corrective action on electric arc.
7, vacuum circuit-breaker according to claim 6, it is characterized in that, from the axial central part of external conductor along clockwise direction or the top that is clipped in the electric arc groove is set in the scopes of anticlockwise 30 degree, near the end of the electrode inboard of the electric arc groove direction of rotation that is positioned at the electric arc groove, with the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery among part.
8, according to each described vacuum circuit-breaker of claim 5 to 7, it is characterized in that,
In vacuum tube, have one group of electrode,
The top that is clipped in each electrode arc groove, be positioned near the electrode inboard of the electric arc groove the direction of rotation of electric arc groove the end, be configured in respectively on the external conductor direction with part among the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery.
9, vacuum circuit-breaker according to claim 8, it is characterized in that near the end of the electrode inboard of the electric arc groove the direction of rotation that make the top that is clipped in each electrode arc groove, is positioned at the electric arc groove, consistent with each other between each electrode with the part among the intersection point of the corresponding wiring of electric arc groove of passing through this end and electrode periphery.
10, according to each described vacuum circuit-breaker of claim 5 to 9, it is characterized in that, the top that is equivalent to respectively be clipped in the electric arc groove, be positioned near the electrode inboard of the electric arc groove the direction of rotation of electric arc groove the end, with the intersection point of corresponding wiring of electric arc groove by this end and electrode periphery among the position of part on mark is set.On this label orientation, draw external conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98103323 CN1205534A (en) | 1997-07-11 | 1998-07-10 | Vacuum breaker |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP186232/97 | 1997-07-11 | ||
| CN 98103323 CN1205534A (en) | 1997-07-11 | 1998-07-10 | Vacuum breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1205534A true CN1205534A (en) | 1999-01-20 |
Family
ID=5217861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98103323 Pending CN1205534A (en) | 1997-07-11 | 1998-07-10 | Vacuum breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1205534A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106233414A (en) * | 2014-04-17 | 2016-12-14 | 株式会社东芝 | Vacuum valve |
-
1998
- 1998-07-10 CN CN 98103323 patent/CN1205534A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106233414A (en) * | 2014-04-17 | 2016-12-14 | 株式会社东芝 | Vacuum valve |
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