JP3534834B2 - Sealed switch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed switch which is provided with an expandable bellows having a plurality of pleats and which is opened and closed many times at high speed.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the structure of a conventional general sealed switch or vacuum switch. In the figure, 1
Is a container whose interior is maintained in vacuum or in which an insulating gas is sealed, 2 and 3 are upper and lower flanges that constitute the upper and lower parts of the container 1, and 4 is a rod on the upper flange 2 of the container 1. Fixed contactor fixed via 5, 6
Is a movable contact provided to face the fixed contact 4,
Reference numeral 7 is a drive rod for driving the movable contact 6 in the vertical direction shown in the figure, 8 is a guide for supporting the drive rod 7 and guiding the vertical movement, and 9 is an end plate 1 fixed to the upper portion of the drive rod 7.
It is a bellows having a plurality of pleats that are airtightly installed between the 0 and the lower flange 3 and that expand and contract. The lower end 9a of the bellows 9 is fixed to the lower flange 3 of the container 1, and the upper end 9b thereof is expanded and contracted as the drive rod 6 moves up and down.
The inside of the container 1 is kept airtight.

Next, the operation of the switch will be described. The movable contactor 6 and the drive rod 7 are connected to an operating mechanism (not shown), and the operation of this operating mechanism drives the movable contactor 6 upward in the drawing at a high speed to close the contacts. . On the contrary, when these are driven downward at high speed in the figure, the contact opening operation is performed. The movable contact 6 and the drive rod 7 move a preset stroke distance in both of the above-described closing operation and opening operation, and a buffer mechanism (not shown) in the final stroke of the opening operation. Stops after being decelerated by.

On the other hand, the upper end 9b of the bellows 9 expands and contracts by a length equal to the operation stroke of the movable contact 5 as the movable contact 6 and the drive rod 7 move up and down. for that reason,
The bellows 9 is provided with a plurality of pleats to withstand the expansion and contraction operation and to obtain the necessary expansion and contraction dimensions.

[0005]

The conventional hermetically sealed switch has the above-described structure. However, during the contact opening operation of the movable contact 6, the first stroke is rapidly accelerated and the last stroke is rapidly decelerated. In the process of, the bellows 9 receives an impact force, which causes the bellows 9 to vibrate, which causes a large local stress. In a general sealed switch, it has been confirmed that maximum stress is generated near the lower flange 3 that is the fixed end of the bellows 9 immediately after the opening operation. Determines the operating life of the vessel. That is, in the conventional sealed switch, there is a problem in that the bellows 9 vibrates due to the opening operation of the switch, resulting in fatigue failure.

The present invention has been made in order to solve the above problems, and suppresses the vibration of the bellows caused by the opening operation of the movable contactor, and seals for a long opening operation life. The purpose is to obtain a mold switch.

[0007]

SUMMARY OF THE INVENTION A hermetically sealed switch according to the present invention comprises a fixed contact fixed to one flange of a container, a movable contact which comes into contact with and separates from the fixed contact, and the movable contact. A drive rod for driving the contactor, and a bellows provided airtightly between the other flange of the container and the drive rod, and having a fold that is expandable and contractible in the drive direction of the movable contactor. It is a ring that is divided so as to contact the folds.

In particular, the ring is provided so as to come into contact with the outer bottom of the fold of the bellows.

The ring is provided so as to contact the inner bottom of the fold of the bellows.

Further, the ring is tightened with a spring from the outside.
It was to so.

[0012]

[Operation] In a sealed switch that can be opened and closed at high speed,
During the first stroke of rapid acceleration and the final stroke of rapid deceleration during the contact opening operation of the movable contact, the bellows receives an impact force, which causes the bellows to vibrate, resulting in a large local stress. Occurs. In the present invention, for example, since the ring is installed so as to contact the outer bottom part and the inner bottom part of the folds of the bellows, the vibration energy of the bellows is dissipated by friction and collision between the bellows and the ring, and as a result, the vibration of the bellows. Decays rapidly. In particular, by dividing the ring
The contact force that is optimal for damping the bellows vibration.
Can be set and stabilize this contact force
You can

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a hermetically sealed ring according to an embodiment of the present invention.
It is a principal part sectional view applied to a switch . In the figure, 1 is a sealed container, 3 is a lower flange, 4 is a fixed contact,
Reference numeral 5 is a rod, 6 is a movable contactor, 7 is a drive rod, 8 is a guide, 9 is a bellows, and 10 is an end plate. Here, outside the folds of bellows 9
It is shown that the ring 11 is installed so as to contact the bottom.
ing.

Next, the operation of the configuration of FIG. 1 will be described. When the impact force acts on the bellows 9 and vibrates during the first stroke of sudden acceleration and the final stroke of sudden deceleration during the opening operation of the movable contact 6, when the ring 1 installed in FIG.
A friction phenomenon and a collision phenomenon occur between 1 and the outer bottom of the fold of the bellows 9, and the vibration energy of the bellows 9 is dissipated and the vibration is rapidly attenuated. Further, the ring 11 provided so as to come into contact with the outer bottom portion of the fold of the bellows 9 does not hinder the expansion and contraction movement of the bellows 9.

The bellows 9 and the ring 11 are made of stainless steel or a stainless steel alloy, and stainless steels are effective in dissipating vibration energy.

FIG. 2 shows a sealed ring according to an embodiment of the present invention.
It shows another example applied to a mold switch, and is 1 to 10.
Indicates the same or corresponding portions as those of the above-mentioned conventional ones, and the description thereof will be omitted. In FIG. 1 , the ring 11 is installed so as to come into contact with the outer bottom portion of the bellows 9, but as shown in FIG. 2, it may be installed so as to come into contact with the inner bottom portion of the bellows 9, which is similar to the above. Produce an effect.

FIG . 3 shows a ring used in the embodiment of the present invention.
FIG. The annular part 11 used in FIGS. 1 and 2 is provided with a dividing part 12 so as to come into contact with the outer bottom part and the inner bottom part of the folds of the bellows 9. That is, by providing the annular ring 11 with the dividing portion 12, it is possible to set the optimum contact force between the annular ring 11 and the bellows 9 for damping the vibration, and to stabilize this contact force. be able to. That is, when the ring 11 is not divided, the fastening force between the bellows 9 and the ring 11 may vary depending on the accuracy of the finished dimensions of both, but the ring 11 is divided and the ring 11 is divided. By tightening with a spring or the like from the outside, the contact force with the bellows 9 can be set to a predetermined value and the contact force can be stabilized.

Reference example. FIG. 4 is a perspective view showing a reference example of a ring. Circle 1 in Figure 4
1 is manufactured by winding a spiral metal wire 13 in an annular shape.
According to FIG. 4, by constructing the circular ring 11 with the spiral metal wire 13, it is possible to further reduce the variation in the contact state between the circular ring 11 and the bellows 9 due to the variation in the dimensional accuracy in machining. It is possible to stabilize this contact force.

[0021]

As described above, according to the present invention, for example, by providing an annular ring on the outside or inside of the bellows so as to contact the bottom of the fold, the vibration energy of the bellows causes friction and collision between the bellows and the annular ring. Is dissipated by and its vibrations decay rapidly. Therefore, excessive stress is not repeatedly applied to the bellows, and the number of times the switch can be used is dramatically increased. In particular,
Damping the vibration of the bellows by dividing the ring
You can set the optimum contact force for
The contact force can be stabilized.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a sealed switch according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a hermetically sealed switch according to an embodiment of the present invention.

FIG. 3 is a perspective view of a ring used in the embodiment of the present invention.

FIG. 4 is a perspective view of a ring used as a reference example .

FIG. 5 is a cross-sectional view showing the configuration of a conventional general sealed switch.

[Explanation of symbols]

1 container, 2 upper flange, 3 lower flange, 4
Fixed contactor, 6 movable contactor, 7 drive rod, 9 bellows, 10 end plate, 11 ring, 12 split parts, 13
Spiral metal wire.

Claims (4)

(57) [Claims] 1. A container for holding a vacuum inside or sealing an insulating gas, a fixed contact fixed to one flange of the container, and arranged so as to be separable from the fixed contact. The movable contactor, the drive rod for driving the movable contactor, and the airtightly provided between the other flange of the container and the drive rod of the movable contactor, the movable contactor is expandable and contractible in the drive direction of the movable contactor. With a bellows having a plurality of pleats, a ring having split parts
Is provided so as to come into contact with the folds of the bellows . 2. The hermetically sealed switch according to claim 1, wherein the annular ring is provided so as to contact an outer bottom portion of the fold of the bellows. 3. The hermetically sealed switch according to claim 1, wherein the annular ring is provided so as to contact an inner bottom portion of the fold of the bellows. 4. The ring is formed from the outside of the bellows.
The tight seal according to claim 2, characterized in that it is fastened with a knuckle.
Sealed switch.