JPH0650924Y2 - Pressure sensor for gas switch - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention detects this when the gas pressure in a switch such as a gas switch installed in an electric circuit such as a distribution line falls below a predetermined value. The present invention relates to a gas switch pressure sensor for stopping the opening / closing function and operating the display device.

[Prior Art] In a gas switch, a gas such as SF ₆ gas is enclosed inside to extinguish the arc generated when the contacts are opened and to maintain the insulation characteristics, but the gas pressure drops. Then, since the characteristic cannot be obtained, an operation / display device for monitoring the gas pressure is provided so that a predetermined measure is taken when the state is reached.

For example, in JP-A-62-66520, the pressure inside the enclosure of the switch is detected by a pressure detecting device such as a bellows, an operating pin is provided at the tip thereof, and a sensor piece is locked to this operating pin. When the pressure in the switch is reduced and the length of the bellows is reduced, the operating pin is configured to be separated from the sensor piece having the four radial recessed grooves to detect the pressure drop. Is disclosed.

That is, the change in the pressure inside the enclosure is analog, but when this reaches a certain predetermined pressure, a mechanical threshold value is set to detect the pressure drop digitally, that is, whether it is normal or abnormal. It is the one. Then, when the pressure drop is detected, the opening / closing function is immediately locked.

[Problems to be solved by the device]

However, if the lock of the switching function of the switch is stopped due to a decrease in the gas pressure in the enclosure of the switch, electric power consumers will experience a power outage without notice, and this will have a significant effect.

Further, since the pressure display of the conventional pressure sensor is a digital display indicating normal or abnormal, it is not possible to confirm the degree of decrease in gas pressure during normal inspection, which makes it difficult to predict.

Further, in such a pressure sensor device, it is necessary to set the pressure at which the sensor piece is disengaged from the operating rod to fall within a predetermined set pressure value (with an allowable error range). It is economically difficult to improve the mechanical accuracy of mechanical parts such as the top.

Therefore, conventionally, for the adjustment, a sensor piece which is rotatably fitted on the actuating shaft is rotated to select one of the four recessed grooves, but the height of the apex of the selected recessed groove is slightly increased. Since the stroke of the operating rod, that is, the operating pressure value until the pressure detecting device operates is adjusted by selecting any one of these heights, the four concave portions of the sensor frame, that is, 4 There is a problem that only step adjustment is possible and stepless adjustment cannot be performed.

Therefore, the present invention displays the gas pressure drop status before the opening / closing function is stopped so that it can be checked during normal inspection, prevents power failure without notice, and has a simple mechanism to set stepless pressure settings. It is an object of the present invention to provide a device capable of

[Means for Solving the Problems]

To achieve this object, a pressure sensor for a gas switch according to the present invention includes a pressure detecting device such as a bellows having a communication hole that communicates with the inside of an enclosure of the switch, and is operated by the pressure detecting device to respond to changes in pressure. An actuating rod that moves in a moving manner, and a sensor piece that is provided at the tip of the actuating rod and has at least two locking step portions that are provided at different positions along the moving direction of the actuating rod and that are orthogonal to the same direction, The locking rod is supported by the mounting frame so as to be movable in the direction perpendicular to the moving direction of the operating rod, and has a locking portion that abuts on the locking step portion, and the locking portion of the locking rod is the locking step. And a biasing spring for biasing the part in a direction of pressing.

In this device, at least two locking steps for locking the sensor piece may be formed on the locking rod side.

[Action]

In the present invention, the operating rod of the pressure detecting device moves as the pressure inside the enclosure of the switch decreases.
When the locking state of the first locking step portion of the sensor piece and the locking portion of the locking rod is released by the movement of the operating rod, the second locking step portion of the sensor frame and the locking portion of the locking rod are released. The lock bar moves to the position where the abuts. It can be seen that the pressure inside the enclosure decreased due to the moving position of the lock bar. When the pressure further decreases, the sensor piece cannot lock the lock bar, the lock bar moves to the specified position, and the opening / closing function is stopped.

It should be noted that at least 2 which is locked to the sensor piece on the lock bar side
The same effect is exhibited when three locking steps are formed.

As described above, in the present invention, the lock bar is provided between the first position (normal pressure state) and the third position (open / closed function stopped state).
Since the second position (pressure drop state) is taken, it is possible to predict the pressure drop situation that results in the switch to stop functioning, and take measures before a power failure occurs.

In addition, the stroke of the operating rod, that is, the operating pressure value until the pressure detecting device operates can be adjusted steplessly by rotating the sensor piece screwed to the operating rod and selecting the mounting height of the sensor piece. You can

〔Example〕

Hereinafter, the present invention will be specifically described with reference to the embodiments shown in the drawings.

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention, showing a case where the pressure inside the enclosure of the switch is normal.

In the figure, reference numeral 1 is a sealed container such as a switch, and a bellows type pressure detection device 2 is attached in an airtight state by a gasket 3 and a nut 4.

The pressure detecting device 2 is provided with an operating rod 5 that moves according to the pressure, and at its tip, as shown in FIG.
A sensor piece 6 provided with two locking step portions 6a and 6b is screwed so that the position can be adjusted, and is locked by a screw or an adhesive agent.

A lock bar 10 is provided between the guide fitting 7 fixed by the nut 4 and the cover 9 fixed to the guide fitting 7 by a fixing screw 8 so as to be slidable in the left-right direction in the drawing.

The locking rod 10 has locking portions 10a for locking the locking step portions 6a, 6b,
Stopper 10 that engages with stopper 9a provided on cover 9
b is formed, and a spring 11 for urging the lock bar 10 in the right direction in the drawing is provided between the stopper 9a and the wall 10c.
Is provided.

In the above configuration, the enclosure 1 is changed from the state shown in FIG.
When the gas pressure in the inside decreases and the operating rod 5 retracts to a predetermined position accordingly, as shown in FIG.
The locking state of the locking portion 10a of 10 and the first locking step portion 6a of the sensor piece 6 is released, and the locking rod 10 is restored by the spring 11 so that the locking portion 10a is the second portion of the sensor piece 6. It moves until it is locked by the locking step portion 6b, and gives a notice display on the display portion 10f. This is the position at which a gas pressure drop notice is issued, although the abnormal state has not yet been reached. If this state is found during normal inspection, etc., the switch will be repaired or replaced at a time that does not interfere with the power demand.

When the gas pressure in the enclosure 1 further decreases and the operating rod 5 further retracts, the locking portion 10a of the locking rod 10 also disengages from the second locking step portion 6b as shown in FIG. , Locking rod 10
Is moved by the restoring force of the spring 11 until the stopper 10b hits the stopper 9a of the cover 9, and a lock is displayed on the display portion 10g. This is the position to lock the switch. Although not shown, a limit switch is interlocked with the lock bar 10 so that the opening / closing function of the switch is stopped when the lock bar 10 moves to a predetermined position.

FIGS. 5 to 7 show a second embodiment of the present invention, which is different from the structure of the first embodiment in that the lock bar 10 is provided with a first engaging member instead of the locking step portion of the sensor piece 6. A stop step portion 10d and a second locking step portion 10e are provided. The other structure is similar to that of the first embodiment, and the description thereof is omitted.

FIG. 5 shows the case where the pressure in the enclosure 1 of the switch is normal, and the first locking step 10d of the lock bar 10 is locked to the side of the sensor piece 6 and is received. ing.

As the pressure inside the enclosure 1 decreases, the operating rod 5 retracts as shown in FIG. 6, and the sensor piece 6 moves to the first locking step 10
The lock bar 10 moves to the right under the pressure of the spring 11 when it is disengaged from d, and is locked to the second locking step 10e, and a notice is displayed on the display 10f. This is the position where the gas pressure drop notice is given.

When the pressure in the sealed container 1 further decreases, the operating rod 5 is retracted as shown in FIG. 7, the sensor piece 6 is disengaged from the second locking step portion 10e, and the stopper 9a hits the stopper 10b. Go to the right and display the lock on the display 10g. This state is the opening / closing function stop position.

In each of the first and second embodiments, two locking step portions are provided, but three or more locking step portions may be provided to display a finer pressure drop situation. .

[Effect of device]

As described above, according to the present invention, it is possible to display and detect that the gas pressure in the enclosure of the switch is low before the opening / closing function is stopped. It is possible to detect and take prescribed measures, and prevent power failure without notice. In addition, the operating pressure can be adjusted steplessly just by adjusting the variation of the elastic modulus of the bellows and the dimensional variation of the mechanical parts such as the sensor piece, and the accuracy of the mechanical parts can be adjusted accordingly. The burden or burden of the adjustment process can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a normal pressure state in the first embodiment of the present invention, FIG. 2 is a sectional view showing a lock advance notice state, FIG. 3 is a sectional view showing a lock state, and FIG. FIG. 5 is a perspective view of a sensor piece in one embodiment, FIG. 5 is a sectional view showing a normal pressure state in a second embodiment of the present invention, FIG. 6 is a sectional view showing a locking advance notice state, and FIG. 7 is a locking state. FIG. 1: Enclosed container, 2: Pressure detection device 3: Gasket, 4: Nut 5: Actuating rod, 6: Sensor piece 6a: First locking step, 6b: Second locking step 7: Guide fitting, 8: Fixing screw 9: Cover, 10: Lock bar 10a: Locking part, 10b: Stopper 10c: Wall part, 10d: First locking step part 10e: Second locking step part

Claims (2)

[Scope of utility model registration request] 1. A pressure detecting device such as a bellows having a communication hole that communicates with the inside of a sealed container of a switch, and an operating rod that is operated by the pressure detecting device and moves according to a change in pressure.
A sensor piece provided at the tip of the operating rod and having at least two locking step portions formed in different positions along the moving direction of the operating rod in a direction orthogonal to the same direction, and a moving direction of the operating rod. A locking bar that is movably supported in a right angle direction and has a locking portion that abuts against the locking step portion, and a locking portion of the locking bar is attached in a direction in which the locking step portion is pressed against the locking step portion. A pressure sensor for a gas switch, comprising a biasing spring for biasing. 2. A pressure detecting device such as a bellows having a communication hole that communicates with the inside of the enclosure of the switch, and an operating rod that is operated by the pressure detecting device and moves according to a change in pressure.
A sensor piece provided at the tip of the operating rod and a mounting frame movably in a direction perpendicular to the moving direction of the operating rod, and a direction orthogonal to the same direction at different positions along the moving direction of the operating rod. Locking bar formed so that at least two locking steps of the locking bar contact the sensor piece, and a biasing spring that biases the locking part of the locking bar in the direction of pressingly contacting the locking step. A pressure sensor for a gas switch, characterized by comprising: