JP2003223835A - Vacuum valve for switching - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum valve for switching an electric circuit, which has a movable contact member (5) and a fixed contact member (6), wherein a mutual distance between the movable contact member (5) and the fixed contact member (6) can be adjusted very easily, in order to switch a plurality of the vacuum valves simultaneously or in order to correct the distance between both the contact members (5) and (6) whose both surfaces are erosional by arcing, when the electric circuit is switched using the vacuum valve and the movable contact member (5) is driven for the fixed contact member (6). <P>SOLUTION: A mechanism to move the fixed contact (6) for the movable contact (5) is added, thereby the mutual distance between both the contact members (5) and (6) becomes adjustable. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed contact and a movable contact that is driven with respect to the fixed contact during an opening / closing process.
The present invention relates to a vacuum valve for a switch, which is provided with a device that adjusts the mutual distance between both movable and fixed contacts.

[0002]

2. Description of the Related Art A vacuum valve of this type is disclosed, for example, in Patent Document 1
It is well known. It discloses a switch having three switching poles. Each of the three opening / closing electrodes is equipped with a vacuum valve arranged in a sealed container so as to interrupt the current path. Each vacuum valve has a fixed contact and a movable contact. The movable contactor is driven by a drive device via a drive mechanism. In order to synchronize the opening and closing times of the opening and closing poles of each vacuum valve, the movable contactor is provided with a device for adjusting the mutual distance between the contactors.

The drive rod of the movable contact can be adjusted with a screw bolt so that the length of the drive rod of the movable contact can be adjusted. Therefore, inevitably, the mutual distance between the two contacts in the open position is adjusted and, as a result, the mutual distance between the two contacts during the opening and closing movement also occurs. In order to adjust the mutual spacing between the two contacts, the drive mechanism must be expensive and corresponding measures must be taken. Thereby, the opening and closing times of each opening and closing pole can be adjusted individually, but this is very expensive. Due to the complicated structure of the entire drive device and the mutual spacing adjustment device between the contacts, erroneous operation and disadvantageous adjustment of the entire drive device cannot be avoided.

[0004]

[Patent Document 1] US Pat. No. 3,787,649

[0005]

SUMMARY OF THE INVENTION It is an object of the invention to form a switch vacuum valve of the type mentioned at the outset such that the mutual spacing between the movable and stationary contacts can be adjusted very easily. .

[0006]

According to the present invention, this problem is solved by making the fixed contact movable in the above-mentioned vacuum valve so that the mutual distance between the two contacts can be adjusted. To be done.

Due to the mobility of the fixed contacts, no action is taken on the drive mechanism for adjusting the mutual spacing between the two contacts. Unlike the conventional contactor that can be moved longitudinally only in the driving direction, adjustment in many spatial axes can be easily performed. For that purpose, for example, it is necessary to dispose the fixed contacts movably. Along with this, inclination of the contactor and uneven damage can be appropriately compensated by adjusting the fixed contactor. The movement of the fixed contacts allows the contact spacing in the open position to be adjusted. Furthermore, the pressing force of the movable contact on the fixed contact can be adjusted.

Further, in a vacuum valve in which both movable and fixed contacts are axially opposed to each other on the longitudinal axis,
Preferably, the stationary contact is movable along the longitudinal axis.

If the mutual spacing between the two contacts is adjusted only by the movement of the fixed contact along the longitudinal axis, it is sufficient that the fixed contact can move in only one axis, so a simple vacuum valve is used. it can.

In the vacuum valve in which the fixed contact is connected to the tube, it is preferable that the fixed contact can be moved together with the tube.

With this arrangement, a normal vacuum valve in which the fixed contact is rigidly or elastically connected to the tube can be used without modification. The adjustment according to the invention of the distance between the two contacts is independent of the vacuum valve used. The tube includes the components that form the vacuum chamber of the vacuum valve.

Further, in the arrangement structure of the vacuum valve arranged in the hermetically sealed container, it is preferable that the device for adjusting the mutual distance between both the contacts can be operated from outside the hermetically sealed container.

The vacuum valve is sealed and protected from external influences. If the mutual distance between the contacts can be adjusted from the outside, it is not necessary to remove the sealed container, and the vacuum valve is not exposed to the risk of damage or contamination. Furthermore, because the sealed container is always placed around the vacuum valve during operation of the device for adjusting the mutual spacing between the contacts, special precautions must be taken to protect the vacuum valve for its adjustment. Absent.

In a preferred embodiment of the invention, the device for adjusting the mutual distance between the two contacts closes the opening of the sealed container.

When the device for adjusting the mutual distance between the two contacts closes the opening of the sealed container, the device forms part of the sealed container. In that case, the handling of the regulator is very simple, especially if the space present between the sealed container and the vacuum valve is filled with a special medium, for example a pressurized inert gas. There is no need for a supplemental closure lid or closure to close the opening. Further, the device for adjusting the mutual distance between the both contacts closes the opening so that the inert gas existing inside the sealed container does not escape to the outside.

The opening may be provided with a female screw into which a device for adjusting the mutual distance between the contacts is screwed.

Due to their simplicity, mechanically sturdy screws are particularly suitable for connecting the device for adjusting the mutual spacing between the two contacts to the opening. Further, this screw allows fine adjustment of the mutual distance between both contacts.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. 1 to 4, the same parts are designated by the same reference numerals.

The vacuum valve 1 shown in FIG. 1 is a part of an opening / closing electrode of a switch (not shown). The vacuum valve 1 includes a tube body 2. The tubular body 2 is in the form of a hollow cylinder whose both end faces are closed by end plates 3 and 4, respectively.

The movable contact 5 penetrates the first end plate 3 in an airtight manner. The contactor 5 is driven by a driving device 7. To seal the movable contact 5 to the first end plate 3, bellows 8 are airtightly connected to the movable contact 5 and the first end plate 3, respectively. There is a guide mechanism 9 for slidingly guiding the movable contactor 5, and the movable contactor 5 is moved by a drive device 7 along its longitudinal axis. The fixed contact 6 is arranged essentially rigidly or slightly elastically on the second end plate 4. Due to the movability of the movable contact 5, electrical contact between the movable contact 5 and the fixed contact 6 occurs. The contacts are not shown to facilitate understanding of the invention.

Supporting devices 10a and 10b are arranged on the tubular body 2. These devices 10a, 10b have a large number of female threaded openings. Screws 11a and 11b to the female threads
Is screwed in, and these screws 11a and 11b are supported by a sealed container 13 arranged on the floor 12. Figure 1 shows two screws 1
Although 1a and 11b are shown symbolically, a large number of screws may be provided along the circumference of the vacuum valve 1.

As the screws 11a and 11b rotate,
The tube 2 shifts its position. As a result, the fixed contact 6 also moves with it because it is rigidly or slightly elastically coupled to the tube 2. On the other hand, the movable contact 5 is not adjusted. Therefore, the mutual distance between the movable contact 5 and the fixed contact 6 is adjusted by the rotational movement of the screws 11a and 11b. Depending on the number of screws 11a, 11b and the number of revolutions of the individual screws, the fixed contact 6 can be moved along its longitudinal axis and the fixed contact 6 can be tilted and / or displaced. With the displacement or inclination, the mutual distance between the movable contact 5 and the fixed contact 6 on the plurality of space axes can be adjusted. Also,
The screws 11a and 11b are supported in the elongated holes, and along with this, the lateral adjustment of the fixed contact 6 can be assisted.

FIG. 2 shows a different embodiment of the device according to the invention. The illustrated fixed contact 6 has a male screw supported by the second end plate 4. By rotating the fixed contact 6, the mutual distance between the movable contact 5 and the fixed contact 6 can be adjusted. Another bellows 8a is provided to seal the screw.

In the embodiment shown in FIG. 3, unlike the embodiment shown in FIGS. 1 and 2, the movable contact 5 is firmly connected to the first end plate 3,
The fixed contact 6 movably penetrates the second end plate 4.
A bellows 8 is provided to seal the fixed contact 6 to the second end plate 4.

The driving device 7 is connected to the movable contactor 5, and the contactor 5 is driven by the driving device 7. At this time, the tube 2 itself is driven by the rigid connection between the tube 2 of the vacuum valve 1 and the movable contact 5. The fixed contact 6 is a support device 10.
a, 10b, these devices 10a, 10b have female threaded openings. The screws 11a and 11b are supported with respect to the floor 12 so that their angles do not change. As described above with reference to FIG. 1, the mutual distance between the fixed and movable contactors 6 and 5 can be adjusted by rotating the screws 11a and 11b.

FIG. 4 shows a different embodiment of the device according to the invention in a detailed sectional view. In this embodiment, the fixed contact 6
The tube body 2 of the vacuum valve 1 moves together with the fixed contact 6 in order to adjust the mutual distance between the movable contact and the movable contact (not shown in FIG. 4). The vacuum valve 1 shown in FIG. 4 is arranged inside a sealed container 13. The sealed container 13 is formed in a substantially hollow cylindrical shape. The sealed container 13 has a joint ring 14 on its end face. The ring 14 forms the point of impact of the closure device 15 of the sealed container 13 for fixing another component.
The pressing lid 17 contacts the hollow cylindrical body of the sealed container 13 with the contact body 16.
Are pressed by the pressing screws 18a and 18b. Hollow cylinder of sealed container 13 and contact body 1
Sealing rings 19a and 19b are inserted to seal between 6 and the pressing lid 17, respectively. Opening 3 of pressing lid 17
A central support 20 is guided in 0. This support 2
0 has a concentric hole, and the main screw 21 penetrates this hole. This screw 21 is used for the second end plate 4 of the tube body 2 of the vacuum valve 1.
Is pressed against the support 20 and held, and as a result, the fixed contact 6 and the tube 2 are brought into contact with each other. The opening 3 is provided on the outer periphery of the support 20.
A guide ring 22a for guiding the support 20 in the axial direction at 0 is provided. Furthermore, a sliding contact 22b is arranged on the support 20 for electrical contact. The opening 30 is provided with a circumferential groove into which another seal ring 19c is inserted. The ring 19c seals the support 20 against the pressing lid 17.

The opening 30 is provided with an internal thread into which the external thread of the support 20 is screwed. A retaining ring 23 is screwed into the screw of the support 20 at the end of the support 20 opposite to the fixed contact 6. The stop ring 23 fixes the position of the support 20 with respect to the pressing lid 17. The retaining ring 23 is stopped by fixing screws 24a and 24b so as to fix the retaining ring 23 before rotating. After removing the set screws 24a and 24b, the set ring 23 is loosened. Then, the support 20 is displaced by the rotation inside the female screw at the opening 30. As a result, the tubular body 2 is displaced with respect to the movable contact 5 together with the second end plate 4 and the fixed contact 6. After the adjustment of the fixed contact 6 is completed, the support 20 is fixed by the retaining ring 23 in the form of a retaining nut. Set screws 24a, 24b through the opening of the retaining ring 23
And the retaining ring 23 by screwing it into the pressing lid 17.
Unintentional loosening can be prevented.

Alternatively, the support 20 is slid into the opening 30 of the pressing lid 17. At this time, the gap between the contacts is adjusted by rotating the retaining ring 23.

The entrance to the device for adjusting the mutual distance between the movable contact 5 and the fixed contact 6 is closed by a lid 25. A sealing ring 19d is inserted between the lid 25 and the pressing lid 17 for sealing.

The embodiments shown in FIGS. 1 to 4 can be combined with one another, resulting in other embodiments.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a first embodiment of a vacuum valve according to the present invention.

FIG. 2 is a schematic sectional view of a second embodiment of a vacuum valve according to the present invention.

FIG. 3 is a schematic sectional view of a third embodiment of the vacuum valve according to the present invention.

FIG. 4 is a sectional view of a fourth embodiment of a vacuum valve according to the present invention.

[Explanation of symbols]

1 vacuum valve 2 tubes 5 Movable contact 6 Fixed contact 13 sealed containers 15 Closure device 30 openings

Claims (6)

[Claims] 1. A stationary contactor (6) and a movable contactor (5) which is driven relative to the stationary contactor (6) during the opening and closing process.
In a vacuum valve (1) for a switch equipped with a device for adjusting a mutual distance between both movable and fixed contacts (5, 6), a fixed contact (6) for adjusting a mutual distance between both contacts.
A vacuum valve characterized by being movable. 2. In a vacuum valve (1) in which both contacts (5, 6) are arranged axially opposite each other on the longitudinal axis, the stationary contact (6) is movable along the longitudinal axis. The vacuum valve according to claim 1, wherein the vacuum valve is provided. 3. A vacuum valve (1) having a fixed contact (6) connected to a tube (2), characterized in that the fixed contact (6) is movable together with the tube (2). The vacuum valve according to claim 1 or 2. 4. In a vacuum valve (1) arrangement structure arranged in a sealed container (13), a device for adjusting a mutual distance between both contacts can be operated from the outside of the sealed container (13, 15). The vacuum valve arrangement structure according to any one of claims 1 to 3, wherein: 5. A device for adjusting the mutual spacing between contacts comprises:
5. Arrangement according to claim 4, characterized in that the opening (30) of the sealed container (13) is closed. 6. Arrangement according to claim 5, characterized in that the opening (30) has an internal thread into which a device for adjusting the mutual distance between the contacts is screwed.