JP2008108443A - Opening/closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an opening/closing device using a vacuum valve to prevent vibrations of a movable side of a vacuum valve by a simple structure. <P>SOLUTION: The opening/closing device is equipped with movable side outer parts 1a which are mutually opposed and positioned in the direction of a force that a movable electrode rod 8 receives by a magnetic field generated by a current flowing in a fixed side conductor 14 and a movable side conductor 16, and a protruding part 11a extended from at least one of a frame 13 and contacting the other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an opening / closing device using a vacuum valve.

  The vacuum valve is a vacuum vessel in which a fixed electrode rod having a fixed electrode and a movable electrode rod having a movable electrode that can be contacted and separated from the fixed electrode are housed in a vacuum vessel. A fixed-side conductor and a movable-side conductor are connected to the end of the fixed electrode bar and the end of the movable electrode bar that are exposed to the outside from the vacuum vessel, respectively, thereby constituting a switchgear such as a vacuum switch or a vacuum circuit breaker.

  Generally, in a switchgear using a vacuum valve, the fixed-side conductor and the movable-side conductor are arranged so as to be substantially orthogonal to the fixed electrode rod and the movable electrode rod of the vacuum valve, and the current flows in a U-shape. Yes. The movable electrode rod is connected to one end of an insulating rod provided with a spring, and the movable electrode rod is movable by a drive unit connected to the other end of the insulating rod. When an excessive current such as a short circuit current flows between the electrodes of the vacuum valve in a closed state where current flows in a U-shape, the movable electrode rod is removed from the magnetic field generated by the current flowing in the fixed-side conductor and the movable-side conductor. The flowing current receives a force in the direction according to Fleming's left-hand rule, the movable side of the vacuum valve including the movable electrode rod is shaken, and the fixed electrode and the movable electrode are separated. There was a problem in that an arc was generated between the separated electrodes and both electrodes were welded.

  Patent Document 1 shows an example in which a movable flange of a vacuum valve is surrounded and held by a fixed collar in order to prevent the movable side of the vacuum valve from swinging. This fixed collar has two parts articulated to each other by a hinge portion, and when the fixed collar is in a closed state, the movable flange of the vacuum valve is sandwiched. This fixed collar was fitted into the frame where the vacuum valve was placed, and was firmly fixed.

JP 2002-25399 A (FIG. 4)

  The conventional switchgear as described above has a problem that the number of parts increases because a fixed collar having a complicated structure is added. Further, since the fixed collar is fitted in the frame and fixed firmly, there is a problem that the structure of the opening / closing device is complicated.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an opening / closing device using a vacuum valve that prevents the movable side of the vacuum valve from swinging with a simple structure.

  The switchgear according to the present invention includes at least one of a movable side outer portion of a vacuum valve and a frame facing each other positioned in the direction of a force received by the movable electrode rod by a magnetic field generated by a current flowing through the fixed side conductor and the movable side conductor. The protrusion part which extends from and contacts the other is provided.

  The present invention can prevent the movement of the movable side of the vacuum valve with a simple structure.

Embodiment 1 FIG.
1 is a block diagram of a switchgear according to Embodiment 1 of the present invention. A vacuum valve 1 serving as an arc extinguishing part of an opening / closing device is a sealed container including a cylindrical insulating container 2 made of alumina ceramic or the like, and a fixed side end plate 3 and a movable side end plate 4 that close the insulating container 2. A vacuum vessel 5 is provided. One end of the fixed electrode bar 6 is attached to the fixed side end plate 3 so as to be coaxial with the insulating container 2. A fixed electrode 7 is joined to the other end of the fixed electrode rod 6. The movable electrode bar 8 is attached to the movable side end plate 4 via a bellows 9 having elasticity so as to be coaxial with the insulating container 2. A movable electrode 10 that can be brought into and out of contact with the fixed electrode 7 is joined to one end of the movable electrode bar 8. An insulating rod 17 is joined to the other end of the movable electrode bar 8. A guide 11 that supports the movable electrode rod 8 is attached to the inside of the bellows 9. A shield 12 is disposed so as to cover the inner surface of the insulating container 2. The shield 12 prevents the inner surface of the insulating container 2 from being contaminated by metal vapor caused by an arc generated when the fixed electrode 7 and the movable electrode 10 are separated.

  The vacuum valve 1 is accommodated in the frame 13. A fixed-side conductor 14 connected to the fixed electrode rod 6 is fixed to the upper inner surface of the frame 13 with a screw or the like (not shown). Further, a movable conductor 16 having a bending portion is fixed to the frame 13 with a screw or the like (not shown) via a connecting portion 15 connected to the other end portion of the movable electrode rod 8 outside the vacuum valve 1. . The movable conductor 16 is disposed substantially in parallel with the fixed conductor 14. In the closed state, a current flows in a U shape from the fixed conductor 14 to the movable conductor 16 through both electrode rods. The insulating rod 17 is connected between the other end portion of the movable electrode rod 8 and a drive unit (not shown) so that it is coaxial with the movable electrode rod 8. The movable electrode rod 8 and the movable electrode 10 move when the insulating rod 17 connected to the vacuum valve is driven by the drive unit. A protrusion 11a provided on the guide 11 which is a part of the movable side outer portion 1a of the vacuum valve 1 is provided on the side opposite to the radial direction in which the movable side conductor 16 extends from the center of the movable electrode rod 8, It is in contact with the facing portion 13a of the frame 13 facing the protruding portion 11a. Here, the direction in which the protruding portion 11a extends is such that the current flowing through the movable electrode rod 8 is directed according to Fleming's left-hand rule by a magnetic field generated by a horizontal current flowing through the fixed-side conductor 14 and the movable-side conductor 16 described later. Corresponds to the direction of force. Unlike the switchgear of Patent Document 1, a part of the structure of the vacuum valve 1 is deformed without adding new parts, and the movable side of the vacuum valve 1 and the frame 13 are not completely fixed. The vacuum valve 1 can be accommodated in the frame 13 by bringing the protrusion 11 a into contact with the frame 13.

  When the alternating current I flows from the fixed conductor 14 to the movable conductor 16 in the closed state, the current component I1 from the center toward the outer periphery is present in the fixed electrode 7 having a diameter longer than the diameter of the fixed electrode rod 6. In the movable electrode 10 facing the fixed electrode 7, there is a current component I <b> 2 directed toward the center of the movable electrode 8 having a diameter smaller than the diameter of the movable electrode 10. The current components I1 and I2 are opposite to each other, and the other current component I2 receives a force in a direction according to Fleming's left-hand rule, that is, a direction repelling from the current component I1 due to the magnetic field generated by one current component I1. In addition, the current component I1 receives a force in the direction according to Fleming's left-hand rule, that is, the direction repelling from the current component I2 by the magnetic field generated by the current component I2. In this way, a repulsive force that tries to peel the fixed electrode 7 and the movable electrode 10 is generated. The spring of the insulating rod 17 pushes up the movable electrode rod 8 against this repulsive force, thereby maintaining the closed state.

  Consider a case where an excessive current such as a short-circuit current flows between the electrodes of the vacuum valve in a closed state where a current flows in a U shape from the fixed side conductor 14 to the movable side conductor 16. For convenience, the current I is divided into a horizontal current Ia flowing through the fixed-side conductor and the movable-side conductor and a current Ib flowing through the movable electrode bar 8 orthogonal to the current Ia. The current Ib flowing through the movable electrode bar 8 is directed rightward in FIG. 1 from the magnetic field B generated by the horizontal current Ia flowing through the fixed-side conductor 14 and the movable-side conductor 16, that is, the direction of the frame 13 according to Fleming's left-hand rule. Directional force F is received. However, the protrusion 11a of the guide 11 of the vacuum valve 1 extends in the direction of the force F received by the current flowing through the movable electrode rod 8 and is in contact with the facing portion 13a of the frame 13 facing the protrusion 11a. The guide 11 receives a reaction opposite to the force F from the frame 13 so that the movable side of the vacuum valve including the movable electrode rod 8 is not shaken.

  In addition, when an excessive current flows from the fixed side conductor 14 to the movable side conductor 16, the repulsive force that tries to peel off the fixed electrode 7 and the movable electrode 10 becomes strong, and the force that the spring of the insulating rod 17 pushes up and this repulsive force The difference becomes smaller. However, as described above, the projecting portion 11a of the guide 11 of the vacuum valve 1 extends in the direction of the force F received by the current flowing through the movable electrode rod 8, and contacts the facing portion 13a of the frame 13 facing the projecting portion 11a. Therefore, the movable side of the vacuum valve including the movable electrode rod 8 is not swung to the right by the force F in the direction of the frame 13. Therefore, the axial component of the force that pushes up the fixed electrode 7 does not decrease because the force that the movable electrode 10 pushes up the fixed electrode 7 is inclined and the axial component that becomes the substantial pushing force does not decrease. A state larger than the repulsive force is maintained. Unlike the switchgear in which the movable side of the vacuum valve including the movable electrode rod is swung, the switchgear according to the present embodiment does not generate an arc due to a gap between the fixed electrode 7 and the movable electrode 10. Therefore, even if an excessive current flows through the vacuum valve, it is possible to prevent both electrodes from being welded.

  As described above, the switchgear according to the present embodiment is completely fixed to the movable side of the vacuum valve, unlike the conventional structure having a complicated structure in which the fixed collar, which is a new part, is firmly fixed in the groove portion of the frame. It is possible to prevent the movement of the movable side of the vacuum valve with a simple structure. Moreover, since the movable side of the vacuum valve is not completely fixed, parts such as screws for fixing are not necessary. In addition, in order to increase the intensity | strength of the protrusion part 11a, you may thicken the protrusion part 11a.

Embodiment 2. FIG.
In the first embodiment, the case where the long protrusion 11a provided on the guide 11 of the vacuum valve 1 is brought into contact with the frame 13 has been described. However, the protrusion 11a of the guide 11 is shortened and the protrusion is provided on the frame 13 as well. Thus, even when the protrusions are brought into contact with each other, it is possible to prevent the movement of the movable side of the vacuum valve with a simple structure. This will be described below.

  FIG. 2 is a configuration diagram of the switchgear according to Embodiment 2 of the present invention. In the drawings, the same symbols are the same or equivalent. Reference numeral 13 b denotes a protrusion that is provided in the facing portion 13 a of the frame 13 that faces the protruding portion 11 a of the guide 11 and extends in a direction opposite to the direction of the force F received by the current Ib flowing through the movable electrode rod 8. As in the first embodiment, without adding new parts, the vacuum valve 1 and a part of the frame 13 are deformed, and the movable portion of the vacuum valve and the frame 13 are not completely fixed, and the protruding portion 11a. In addition, the vacuum valve 1 can be accommodated in the frame 13 by bringing the protruding portion 13b into contact with each other.

  Consider a case where an excessive current such as a short-circuit current flows between the electrodes of the vacuum valve in a closed state where a current flows in a U shape from the fixed side conductor 14 to the movable side conductor 16. Even in this case, the protrusion 11a of the guide 11 of the vacuum valve 1 extends in the direction of the force F received by the current Ib flowing through the movable electrode rod 8 and contacts the protrusion 13b of the frame 13 facing the protrusion 11a. Therefore, the guide 11 receives a reaction opposite to the force F received by the current Ib flowing through the movable electrode rod 8 from the protrusion 13b of the frame 13, and the movable side of the vacuum valve including the movable electrode rod 8 is shaken. Absent. Therefore, as in the first embodiment, even if an excessive current flows through the vacuum valve, the fixed electrode 7 and the movable electrode 10 do not peel off, so that the electrodes can be prevented from welding.

  Moreover, since the opening / closing apparatus of this Embodiment can shorten the protrusion part 11a of the guide 11 of the vacuum valve 1 compared with Embodiment 1, it can raise the intensity | strength of the protrusion part 11a.

Embodiment 3 FIG.
In the first and second embodiments, the case where the protrusion 11 a provided on the guide 11 of the vacuum valve 1 is provided and the vacuum valve 1 is improved has been described. However, the protrusion 13 b facing the guide 11 is provided only on the frame 13. Even when it is provided and brought into contact with the guide 11, it is possible to prevent the movement of the movable side of the vacuum valve with a simple structure. This will be described below.

  3 is a configuration diagram of a switchgear according to Embodiment 3 of the present invention. In the drawings, the same symbols are the same or equivalent. A protruding portion 13 b provided on the frame 13 is in contact with the guide 11 that is a part of the movable side outer portion 1 a of the vacuum valve 1. Similar to the first embodiment, a part of the frame 13 is deformed without adding new parts, and the movable portion of the vacuum valve and the frame 13 are not completely fixed, and the protruding portion 13b is attached to the guide 11. The vacuum valve 1 can be accommodated in the frame 13 in contact.

  Consider a case where an excessive current such as a short-circuit current flows between the electrodes of the vacuum valve in a closed state where a current flows in a U shape from the fixed side conductor 14 to the movable side conductor 16. Even in this case, the protrusion 13b of the frame 13 extends in the direction opposite to the direction of the force F received by the current Ib flowing through the movable electrode rod 8, and is in contact with the guide 11 facing the protrusion 13b. The guide 11 receives a reaction opposite to the force F received by the current Ib flowing through the electrode rod 8 from the protruding portion 13b of the frame 13, and the movable side of the vacuum valve including the movable electrode rod 8 is not shaken. Therefore, as in the first embodiment, even if an excessive current flows through the vacuum valve, the fixed electrode 7 and the movable electrode 10 do not peel off, so that the electrodes can be prevented from welding.

  Further, unlike the first and second embodiments, the switchgear according to the present embodiment does not improve the vacuum valve 1, and therefore has an advantage that can be applied to a general vacuum valve.

Embodiment 4 FIG.
In the third embodiment, the case where the protrusion 13b provided on the frame 13 is brought into contact with the guide 11 of the vacuum valve 1 has been described. However, even when the protrusion 13b is brought into contact with the movable side of the insulating container 2 of the vacuum valve 1, A simple structure can prevent the movable side of the vacuum valve from swinging. This will be described below.

  4 is a block diagram of a switchgear according to Embodiment 4 of the present invention. In the drawings, the same symbols are the same or equivalent. The protruding portion 13b provided on the frame 13 extends in the direction opposite to the direction of the force F received by the current Ib flowing through the movable electrode rod 8, and is movable in the insulating container that is a part of the movable side outer portion 1a of the vacuum valve 1. A part of the side outer portion 2a is in contact. As in the first embodiment, a part of the frame 13 is deformed without adding new parts, and the projecting portion 13b can be moved in an insulating container without completely fixing the movable side of the vacuum valve and the frame 13. The vacuum valve 1 can be housed in the frame 13 in contact with the side outer portion 2a.

  Consider a case where an excessive current such as a short-circuit current flows between the electrodes of the vacuum valve in a closed state where a current flows in a U shape from the fixed side conductor 14 to the movable side conductor 16. Even in this case, the protruding portion 13b of the frame 13 extends in the direction opposite to the direction of the force F received by the current Ib flowing through the movable electrode rod 8, and the outer side of the insulating container movable side of the vacuum valve 1 facing the protruding portion 13b. Since it is in contact with the portion 2a, the insulating container movable side outer portion 2a receives a reaction opposite to the force F received by the current Ib flowing through the movable electrode rod 8 from the protruding portion 13b of the frame 13, and the movable electrode rod 8 The movable side of the vacuum valve including is not shaken. Therefore, as in the first embodiment, even if an excessive current flows through the vacuum valve, the fixed electrode 7 and the movable electrode 10 do not peel off, so that the electrodes can be prevented from welding.

  Further, the opening / closing device of the present embodiment has an advantage that can be applied even when it is difficult to bring the protruding portion 13b of the frame 13 into contact with the guide 11 of the vacuum valve 1.

Embodiment 5. FIG.
In the third and fourth embodiments, the case where one protrusion 13b provided on the frame 13 is brought into contact with either the guide 11 of the vacuum valve 1 or the movable side of the insulating container 2 has been described. Even when two projecting portions are brought into contact with the movable side outer portion 1a of the vacuum valve 1, it is possible to prevent the movable side of the vacuum valve from swinging with a simple structure. This will be described below.

  5 is a block diagram of a switchgear according to Embodiment 5 of the present invention. In the drawings, the same symbols are the same or equivalent. Two protrusions 13b and 13c provided on the frame 13 extend in the direction opposite to the direction of the force F received by the current Ib flowing through the movable electrode rod 8, and are part of the movable side outer portion 1a of the vacuum valve 1, respectively. The guide 11 and the insulating container movable side outer portion 2a are in contact with each other. As in the first embodiment, the projections 13b and 13c can be moved without deforming a part of the frame 13 and completely fixing the movable side of the vacuum valve and the frame 13 without adding new parts. The vacuum valve 1 can be accommodated in the frame 13 in contact with the side outer portion 1a.

  Consider a case where an excessive current such as a short-circuit current flows between the electrodes of the vacuum valve in a closed state where a current flows in a U shape from the fixed side conductor 14 to the movable side conductor 16. Even in this case, the protrusions 13b and 13c of the frame 13 extend in the direction opposite to the direction of the force F received by the current Ib flowing through the movable electrode rod 8, and the guide 11 of the vacuum valve 1 facing the protrusions 13b and 13c. And the insulating container movable side outer portion 2a is in contact with the guide 11 and the insulating container movable side outer portion 2a projecting from the frame 13 due to the reaction opposite to the force F received by the current Ib flowing through the movable electrode rod 8. The movable side of the vacuum valve including the movable electrode rod 8 is not shaken by receiving from the parts 13b and 13c. Therefore, as in the first embodiment, even if an excessive current flows through the vacuum valve, the fixed electrode 7 and the movable electrode 10 do not peel off, so that the electrodes can be prevented from welding.

  Further, unlike the third and fourth embodiments, the switchgear according to the present embodiment can bring the projecting portions 13b and 13c of the two frames 13 into contact with the movable side outer portion 1a of the vacuum valve 1. The strength of the protrusion can be increased by dispersing the force applied to the protrusion.

  In addition, although demonstrated by the case where two protrusion parts were provided in the flame | frame 13, it does not restrict to this. You may provide in the movable side outer part 1a of the vacuum valve 1. FIG. One of the protrusions may be provided on the frame side, and the other of the protrusions may be provided on the movable side outer portion 1a. It may be a case where a plurality of protrusions more than two are provided.

  In the first and second embodiments, the guide 11 is provided with the protruding portion, but it may be provided on the insulating container 1 or the movable end plate 4 on the movable side of the vacuum container.

  Moreover, although Embodiment 1 thru | or 5 demonstrated the case where the protrusion part provided in the movable side outer part 1a of a vacuum valve or the opposing part 13a of a flame | frame was always made to contact the other party, A slight gap may be formed between them so that the displacement force due to the magnetic field generated by the excessive current increases and the movable side outer portion 1a of the vacuum valve contacts with each other. This slight gap is a gap where the fixed electrode 7 and the movable electrode 10 are not separated even if the movable side of the vacuum valve is slightly shaken.

  Further, although the frame 13 has been described as a frame in which a part of the drive unit that drives the insulating rod 17 enters, it may be a large frame in which all the drive units enter. Although the case where the alternating current I flows in the closed state has been described, a direct current may be used. Although the case where a current flows in a U shape from the fixed side conductor to the movable side conductor has been described, a case where the fixed side conductor and the movable side conductor are not parallel to each other may be in a horizontal shape. A component orthogonal to the movable electrode rod of the current flowing through the fixed side conductor and the movable side conductor may be considered.

  Although the case where the movable-side conductor 16 is disposed substantially in parallel with the fixed-side conductor 14 has been described, the present invention is not limited to this. When each radial line that penetrates the fixed side conductor and the movable side conductor from the axis of the vacuum valve is projected onto a projection plane that is orthogonal to the axis of the vacuum valve, the two radial lines do not substantially coincide on the projection plane. You may have it. In this case, a combined magnetic field obtained by synthesizing the magnetic field generated by the current flowing through the fixed-side conductor 14 and the magnetic field generated by the current flowing through the movable-side conductor 16 is considered, and the direction of the force that the current flowing through the movable electrode 8 receives from the combined magnetic field is used as a reference. A protrusion may be provided.

It is a block diagram of the switchgear in Embodiment 1 of this invention. It is a block diagram of the switchgear in Embodiment 2 of this invention. It is a block diagram of the switchgear in Embodiment 3 of this invention. It is a block diagram of the switchgear in Embodiment 4 of this invention. It is a block diagram of the switchgear in Embodiment 5 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum valve 1a The movable side outer part of a vacuum valve 5 Vacuum container 6 Fixed electrode rod 7 Fixed electrode 8 Movable electrode rod 10 Movable electrode 11 Guide 11a, 13b, 13c Protruding part 13 Frame 14 Fixed side conductor 16 Movable side conductor

Claims (7)

A fixed electrode rod having a fixed electrode and a movable electrode rod having a movable electrode that can be contacted and separated from the fixed electrode are housed in a sealed container, and a guide for supporting the movable electrode bar is provided outside the sealed container. A vacuum valve,
A frame for housing the vacuum valve;
A fixed-side conductor fixed to the frame and connected to the fixed electrode rod;
A movable conductor fixed to the frame and connected to the movable electrode rod;
Extending from at least one of the movable side outer portion of the vacuum valve and the frame facing each other located in the direction of the force received by the movable electrode rod by the magnetic field generated by the current flowing through the fixed side conductor and the movable side conductor And an opening / closing device provided with a protruding portion in contact with the other. A fixed electrode rod having a fixed electrode and a movable electrode rod having a movable electrode that can be contacted and separated from the fixed electrode are housed in a sealed container, and a guide for supporting the movable electrode bar is provided outside the sealed container. A vacuum valve,
A frame for housing the vacuum valve;
A fixed-side conductor fixed to the frame and connected to the fixed electrode rod;
A movable conductor fixed to the frame and connected to the movable electrode rod;
Protrusions extending from at least one of the movable side outer portion of the vacuum valve and the frame in the direction of the force received by the movable electrode rod by the magnetic field generated by the current flowing through the fixed side conductor and the movable side conductor. An opening / closing device, wherein the projecting portion contacts the other side at least when the movable side outer portion of the vacuum valve is displaced by the magnetic field.   The switchgear according to any one of claims 1 and 2, wherein the protruding portion is provided on a movable outer side portion of the vacuum valve.   The switchgear according to any one of claims 1 and 2, wherein the protrusions are provided on the movable side outer part of the vacuum valve and the frame.   The opening / closing apparatus according to claim 1, wherein the protrusion is provided on the frame.   The switchgear according to any one of claims 3 and 4, wherein the protrusion is provided on the guide.   The opening / closing apparatus according to claim 3, wherein the protruding portion is provided in the sealed container.

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