JP3237515B2 - Display method of gas pressure drop of gas switch and gas 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 method for indicating a decrease in gas pressure of a gas switch and a gas switch, and more particularly to a lock for locking an operation handle when the pressure of gas sealed in the switch is reduced. The present invention relates to an apparatus for displaying the reduced pressure state before reaching the operating pressure.

[0002]

2. Description of the Related Art A gas switch in which a gas such as SF6 gas is sealed in a switch to extinguish an arc generated when a contact is opened and to maintain an insulation performance is disclosed in, for example, Japanese Patent Application Laid-Open No.
JP-363826, JP-A-7-20010,
JP-B-63-25629, JP-B-62-4540
No. 0 publication. In gas switches,
If the pressure of the enclosed gas decreases, the above performance cannot be obtained. For this reason, when the gas pressure drops below a predetermined value, these gas switches detect this and display it with an audible or / and visible signal using electrical or mechanical means, A device is provided for locking the operation handle of the gas switch so that it cannot be operated, and for locking the electric circuit of the VTC trip operation.

[0003]

However, the conventional gas switch has the following problems. That is, in the conventional gas switch, in view of the characteristic of SF6 gas that the gas pressure decreases due to the temperature decrease and the safety factor, the operation handle is operated at a gas pressure value higher than the gas pressure value required to lock the operation handle. Locking control is performed to ensure safety performance.

[0004] In the conventional control of the gas switch, only the operation handle is locked or not locked. Therefore, it is not possible to judge how much gas leakage has progressed until the operation handle is locked. Then, one day, the operation handle is suddenly locked. From the viewpoint of maintenance management of the gas switch, from the viewpoint of how much gas leakage of the gas switch has progressed, for example, if it is found that the gas pressure is between the specified pressure and the lock operating pressure for locking the operation handle, the next time Since the countermeasures such as inspection and replacement of the switch can be taken, the operation handle locks suddenly one day,
It can be used safely without suffering damage such as inoperability of the switch. However, the conventional gas switch does not have such a function, and after the lock state of the operation handle occurs,
There was a problem of being chased by such measures.

[0005] Therefore, an object of the present invention is to set the pressure between the specified pressure and the lock operating pressure before the pressure of the gas sealed in the switch decreases to reach the lock operating pressure for locking the operation handle. It is an object of the present invention to provide a method of displaying a decrease in gas pressure of a gas switch and a gas switch which display the fact.

[0006]

Means taken to achieve the above object and to solve the problems are as follows. In the first invention, when the pressure of the sealed gas is reduced to a lock operating pressure for locking the operation handle, this is detected, this state is displayed, and the operation handle is locked. a display method for a gas pressure drop of the gas switchgear, even an obtuse angle
Folded in two places to form three display parts
When the pressure of the charged gas is the specified pressure, the display panel is colored green or the like by the interlocking plate with the elongated display panel at the tip.
When the pressure of the charged gas decreases and is between the specified pressure and the lock operating pressure, the interlocking plate rotates due to the expansion of the bellows, and the normal display portion is displayed on the display window .
The notice display section colored yellow etc. is displayed on the display window, and when the pressure of the sealed gas further decreases and is the lock operating pressure, the interlocking plate further rotates due to the expansion of the bellows, and the display plate A method of displaying a decrease in gas pressure of a gas switch, characterized in that a reduced-pressure display section colored in red or the like is displayed on a display window .

In the second invention, a pressure detecting device for detecting that the pressure of the gas sealed in the gas switch has fallen below a specified pressure, and a pressure reducing display for displaying the state of the pressure of the sealed gas. A gas switch including a device and a lock device that locks an operation handle when the pressure of the charged gas decreases to a lock operation pressure, wherein the pressure detection device includes a bellows and a pressure of the charged gas. The operating rod that moves due to the expansion of the bellows when lowered and the screw structure
An engagement adjusting member having a moving amount of the operating rod,
An actuating member urged in the rotational direction and having an engagement recess and an advancement state engaging portion engaged with the engagement adjusting member of the actuation rod, wherein the decompression display device is interlocked with the actuation member. Rotate and bend in two places with obtuse angle
It has an elongated display plate with a display section at its tip,
Indicates a normal display section colored in green or the like, and a yellow indicating that the pressure of the charged gas is between the specified pressure and the lock operation pressure.
A colored warning display unit, vacuum display unit that is colored in red or the like provided in such, communicating to display the respective display portion in the display window
A moving plate is provided, and when the pressure of the sealed gas is a specified pressure, the engaging adjusting member of the operating rod and the engaging concave portion are engaged so that the normal display portion of the display plate is displayed on the display window. When the pressure of the sealed gas decreases and falls between the specified pressure and the lock operating pressure, the operating rod moves to disengage the engagement adjusting member and the engaging recess, and the operating member and the interlocking plate rotate. Then, the engagement adjustment member is engaged with the notice state engagement portion so that the notice display portion of the display plate is displayed on the display window, and when the pressure of the sealed gas further decreases and becomes the lock operating pressure, The gas is characterized in that the operating rod is moved, the engagement adjusting member is disengaged from the depressurization notice guide portion, the operating member and the interlocking plate are rotated, and the depressurized display portion of the display plate is displayed on the display window. It is a switch.

A bellows is usually used as an operating means that operates when the pressure of the enclosed gas falls below a specified pressure. However, the operating means is not limited to this, and for example, a Bourdon tube, a diaphragm, etc. Can also be used.

Operation When the pressure of the gas sealed in the switch becomes lower than the specified pressure, a notice indicating portion of the interlocking plate indicates on the pressure reducing display device that the gas pressure is between the specified pressure and the lock operating pressure. indicate. When the pressure of the filled gas further decreases and the pressure decreases to the lock operating pressure, the pressure reducing display device displays on the interlocking plate a reduced pressure display section indicating that the gas pressure has decreased to the lock operating pressure, and The locking device operates to lock the operation handle.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail based on embodiments shown in the drawings. FIG. 1 is a front view showing the entire gas switch according to the present invention, FIG. 2 is a side view of the gas switch shown in FIG. 1, FIG. 3 is an explanatory cross-sectional view of a pressure detection device and a decompression display device, and FIG. Explanatory diagram showing the relationship between the pressure detecting device and the pressure reducing display device with the display cover removed, FIG.
FIG. 6 is a sectional view taken along line AA of the operating member shown in FIG.
FIG. 6 is a sectional view showing another embodiment of the operation member shown in FIG. 5. 7 is a partially cutaway explanatory view of a decompression display device and a lock device of an operation handle, FIG. 8 is a schematic explanatory view seen from a direction C in FIG. 7, and FIG. 9 is a schematic explanatory view of main parts seen from a direction D in FIG. It is. FIG. 10 shows the correlation between the movement of the operating member and the interlocking plate in accordance with the change in the gas pressure in the gas switch, and is an explanatory diagram showing a specified pressure state. FIG. 11 is an explanatory diagram showing a notice state of pressure reduction. It is an explanatory view showing a locked state of the operation handle.

Reference numeral 1 denotes a gas switch. The gas switch 1 includes a case 10. Side wall 1 of case 10
2, an operation handle 11 is provided to protrude outward. The operation handle 11 is for opening and closing the contact of the switch.
The operation handle 11 and the stopper 110 are mechanically constrained and perform the same movement. In FIG. 7, the operation handle 11 is in the position where the switch is in the ON state, and in the OFF state, the operation handle 11 is in a state rotated by 90 ° counterclockwise in the figure.

The gas switch 1 includes a pressure detecting device 2, a pressure reducing display device 3, and a lock device 4. Decompression display device 3
The protrusion of the lock device 4 is shorter than the protrusion of the operation handle 11. Next, the pressure detection device 2, the pressure reduction display device 3, and the lock device 4 will be described.

(Pressure Detecting Device 2) Referring to FIG. The pressure detecting device 2 is installed on the side wall 12 in an airtight state by a known means. Pressure detector 2
Is a bellows 21 and an operating rod 2 operated thereby.
Two. The operating rod 22 is provided with a base 24 at the base end. A substrate 27 and a hollow bearing 25 are screwed to the side wall 12 with a nut 28, and a bellows flange 210 is in close contact with the side wall 12 at the base end of the bearing 25. A bellows 2 is provided between the bellows flange 210 and the base 24.
1 and an urging spring 26 for maintaining the balance at a predetermined position at a predetermined pressure value.

The operating rod 22 is inserted through the bearing 25, and the distal end is located outside the case 10. The base 24 at the base end is located inside the case 10. An engagement adjusting member 23 is screwed to the distal end. The engagement adjusting member 23 corrects the amount of movement of the operating rod 22 and is used for correcting variations in components and adjusting a detection value, and can be finely adjusted by a screw structure.

When the gas pressure in the case 10 decreases, the bellows 21 expands, and the base 24 moves rightward. That is, the operating rod 22 moves according to the expansion and contraction of the bellows 21. To attach the pressure detecting device 2 to the case 10, a screw is provided in a small diameter portion of the bellows flange 210, and the board 27 is sandwiched therebetween.
It is fixed by a nut 28. An O-ring 29 is arranged on the contact surface between the case 10 and the bellows flange 210 so as to maintain airtightness.

The substrate 27 has a display cover 3 to be described later.
The support column 270 for fixing 3 is fixed by caulking two places. The board 27 is attached to the case 10 at two places, one of which is the nut 28. The other is a nut 1 attached to a stat bolt 101 welded to the case 10.
02 is fixed by tightening it via a spring washer.

(Decompression Display 3) The decompression display 3 is provided outside the side wall 12, and the pressure detector 2 displays the pressure state of the gas sealed in the case 10. The decompression display device 3 has an operating member 32. The operating member 32 has a cylindrical rotating shaft 322 and a rotating plate 323 provided integrally with the rotating shaft 322. The rotating shaft 322 has an engaging portion 310 formed at the tip thereof, which is formed by fitting unevenness. The rotation shaft 322 is
The operation shaft 31 is fixed to the center of the substrate 27 by caulking and is rotatably mounted. Rotating plate 3
23 is an engagement adjusting member 2 screwed to the tip of the operating rod 22
3 is formed with an engagement recess 320.

On the bellows 21 side of the operating member 32, a decompression notice guide 321 extending from the engagement concave portion 320 to the notice state engagement portion 330 is formed (see FIG. 4). The decompression notice guide 321 can be formed by grinding a single plate as shown in FIG. 5, or can be formed by laminating two or more plates as shown in FIG. Guide 32
It can also be formed by arranging a plate body in which 1 is notched.

Referring to FIG. Rotating plate 3 as described above
23 is an engagement concave portion 320 and a decompression notice guide portion 32 subsequent thereto.
One. The operating member 32 is urged in the rotational direction by a spring (not shown). In the normal state, the engagement adjusting member 23 of the operating rod 22 and the engagement recess 320 are engaged and stopped.

When the gas in the case 10 is depressurized, the operating rod 22 moves rightward in FIG. Accordingly, the operating member 32 is released from the engaged state, and rotates counterclockwise integrally with the rotating shaft 322 along a plane parallel to the side wall 12.
Accordingly, the engagement adjusting member 23 is provided with the
1 to stop the engagement at the notice state engaging portion 330. 5
Reference numeral 00 denotes a microswitch arranged near the operating member 32, which has a lever 520.

The decompression display device 3 has a display cover 33 having a bottomed cylindrical shape. The display cover 33 covers at least the operation shaft 31 and the operation member 32. An interlocking plate shaft 36 is provided through the display cover 33 (see FIG. 3). At the base end of the interlocking plate shaft 36, an engaging portion 360 made of fitting unevenness is engaged with the engaging portion 310 at the tip of the rotation shaft 322.
Is formed. Therefore, the engaging portion 310 and the engaging portion 360
When the rotating shaft 322 rotates in the state where the is fitted, the interlocking plate shaft 36 also rotates.

Referring to FIG. The interlocking plate 34 is attached to the distal end side of the interlocking plate shaft 36. The interlocking plate 34 is bent at two positions at an obtuse angle and has at its tip an elongated display plate 340 having three display portions formed thereon (the display plate is omitted in FIG. 3). The display panel 340 has a reduced-pressure display section 340 colored in red or the like from the base to the tip.
a, a notice display portion 340b colored in yellow or the like, and a normal display portion 340c colored in green or the like.

The interlocking plate 34 is provided with an engaging portion 341 for engaging with an interlocking plate engaging portion 42 to be described later and an operating projection 342. A notch 343 that does not engage with the interlocking plate engaging portion 42 is formed between the engaging portion 341 and the operation protrusion 342. The interlocking plate 34 rotates integrally with the interlocking plate shaft 36 along a plane parallel to the side wall 12. Reference numeral 5 denotes a protective cover that covers the display cover 33, and a display window 50 is provided on the lower surface so as to be seen from below.

(Locking Device 4) Referring to FIG. The locking device 4 is provided on the side wall 1 of the case 10.
2 It is installed outside and locks the operation handle 11. The locking device 4 has a tripping claw 40 and a plate-shaped locking member 45 formed in a substantially “J” shape. The lock member 45 includes a lock body 450 and a pressing body 452 provided integrally with the lock body 450.

The tripping claw 40 is fixed to the tip of a pivot 41 provided through the side wall 12 with a screw. Therefore,
The pivot 41 rotates together with the tripping pawl 40. As shown in FIG. 8, a boss 410 penetrating through the case 10 is fixed with a nut. The pivot 41 is inserted through the boss 410.

The support frame 44 is fixed to the boss 410 with a nut. The side wall 12 is provided with a support plate 37 having a square hole 370 formed by welding. An engagement notch 44 a is provided at the tip of the support frame 44. The engagement notch 44a and the support plate 37 are fitted, and the support frame 44 is fastened to the boss 410 with a nut to perform positioning and rotation prevention. A lock body 450 is attached to the square hole 370 so as to penetrate therethrough.

The tripping claw 40 is provided with an interlocking plate engaging portion 42 that engages with the engaging portion 341 of the interlocking plate 34. On the side opposite to the interlocking plate engaging portion 42, a contact portion 42a is provided.
Further, a stopper pin 451 that engages with the tripping claw 40 is formed on the lock body 450. Tripping nail 4
0 is a stopper pin 4 protruding from the lock member 45.
A lock member engaging portion 43 that engages with 51 is provided. In the normal state, the tripping claw 40 is in the stopped state in which the engaging portion 341 and the interlocking plate engaging portion 42 are engaged, and the stopper pin 451 and the lock member engaging portion 43 are engaged. .

The lock member 45 is urged toward the operation handle 11 by a spring 48. Lock member 45
Locks the operation handle 11 from moving in parallel with the side wall 12 due to the disengagement of the stopper pin 451 and the lock member engaging portion 43. 47 is an O-ring for keeping the gas container airtight.

One end of a wire rope 52 is fixed to the pivot 41 with screws or the like. The other end of the wire rope 52 is fixed to the tip of the lever of the micro switch 501 through the buffer plate 51. In the present embodiment, the contact of the microswitch 501 is connected in series with a trip coil for shutting off a switch in the event of a ground fault or short circuit, so that the voltage of the trip coil cannot be applied during pressure reduction. . It is also possible to take out the alarm contact at the time of pressure reduction in the same manner.

Reference numeral 53 denotes a unit frame in which a mechanism unit such as an on / off operation and a trip is attached to the case 10. The wire rope 52 is passed through a hole formed in the unit frame 53. Therefore, only a very small space of the unit is required, and the limited space can be effectively used.

Operation The operation will be described mainly with reference to FIGS. 3, 7, and 10 to 12. When the gas pressure in the case 10 is within the specified pressure range, the engagement adjusting member 23 and the engagement recess 320 of the rotating plate 323 are in the engaged state. At this time, the normal display section 340c is visible from the display window 50, and the case 10
It can be visually recognized from the outside that the pressure of the gas sealed in the inside is within the range of the specified pressure.

When the gas pressure in the case 10 decreases, the bellows 21 expands. As the bellows 21 expands, the operating rod 22 moves rightward in FIG.
3 and the engagement state between the engagement recess 320 of the rotating plate 323 is released. When the engagement state is released, the engagement adjustment member 23 passes through the decompression notice guide section 321 and is engaged with the notice state engagement section 330. At this time, the notice window 340b is displayed from the display window 50.
Can be seen, it can be visually recognized that the pressure of the gas sealed in the case 10 is between the specified pressure and the lock operating pressure, and in the near future, the operation handle 11 of the gas switch 1 will be locked and opening and closing operations will not be possible. Things can be displayed in advance. Therefore, such as replacing the gas switch 1 before that
Preparations and countermeasures can be made with a margin in advance.

When the gas pressure in the case 10 further decreases, the bellows 21 further expands. As the bellows 21 expands, the operating rod 22 further moves rightward in FIG.
Notice state engagement portion 33 of engagement adjustment member 23 and rotating plate 323
The engagement state with 0 is released. At this time, the decompression display section 340a can be seen from the display window 50, and it can be visually recognized that the pressure of the sealed gas has dropped below the lock operating pressure.

The engagement adjusting member 23 and the notice state engagement portion 3
By releasing the engagement state with 30, the operating member 32 and the interlocking plate 34 rotate counterclockwise. When the interlocking plate 34 rotates counterclockwise, the operation protrusion 342 is moved to the interlocking plate engaging portion 42.
push. When the operation protrusion 342 pushes the interlocking plate engagement portion 42, the release claw 40 rotates clockwise, and the stopper pin 451
And the lock member engagement portion 43 is released.

With the release described above, the lock member 45 moves rightward in the figure. Therefore, the lock body 450 moves rightward to lock the operation handle 11 so as not to move. Pressing body 4 provided integrally with lock body 450
52 pushes the contact portion 42a to rotate the release claw 40, and the pivot 41 rotates together with the release claw 40.
The pivot 41 pulls the wire rope 52 to open the microswitch 501 so that no voltage can be applied to the trip coil.

As shown in FIGS. 10 to 12, a microswitch 500 is disposed near the operating member 32, the lever 520 is pressed by the operating member 32, and the rotation of the operating member 32 at the time of an advance notice of gas decompression. , The lever 520 is separated from the operating member 32, and the micro switch 500 is operated. For this reason, at the time of gas decompression notice, the micro switch 500 activates an alarm of a monitoring device at a remote location to notify the remote location that the gas pressure in the case is between the specified pressure and the lock operation pressure. Can be.

FIGS. 13 to 16 are explanatory views showing another embodiment of the structure showing a notice of a decrease in the gas pressure. 13 (a), 13 (b) and 13 (c), the rotating plate 323 is provided with a required angle and the base portion is fixed to the rotating shaft 322 in the structure showing the gas pressure drop notice. Plate 323
a and 323b, and are urged clockwise as indicated by arrows. The notice body engaging portion 330 is provided on the plate body 323a. 220 is the operating rod 22
(Not shown in FIGS. 13 to 16) is a round bar-shaped engagement adjusting member.

Operation When the gas pressure in the case 10 is in a specified pressure state,
As shown in FIGS. 13A and 13B, the plate 323b is engaged with the engagement adjusting member 220 at the side edge 320a. When the gas pressure in the case 10 decreases, the bellows 21 expands. As the bellows 21 expands, the engagement adjusting member 220 moves upward in FIG. 13, and the engagement state between the engagement adjusting member 220 and the plate 323b is released. As shown in FIG. 13C, the engagement adjusting member 22 is released by releasing the engagement state.
“0” is engaged with the notice state engaging portion 330 to enter the notice state.

In the structures shown in FIGS. 14 (a), (b) and (c), which indicate the notice of a decrease in gas pressure, the rotating plate 323 is fixed to the rotating shaft 322, and as shown by arrows. Energized clockwise. The rotation plate 323 has an engagement hole 320b provided eccentrically with respect to the rotation shaft 322. The edge of the engagement hole 320b in the counterclockwise direction is a notice state engagement portion 330. Reference numeral 220a denotes an engagement adjusting member formed of a round bar, a tip end of which is a noticeable engagement projection 22 eccentric from the center and formed at a clockwise end.
1 is provided.

Operation When the gas pressure in the case 10 is in a specified pressure state,
As shown in FIGS. 14A and 14B, the engagement adjusting member 220
a is in the state of being inserted into the engagement hole 320b,
20a is engaged with the engagement hole 320b. Case 1
When the gas pressure in 0 becomes low, the bellows 21 expands. As the bellows 21 expands, the engagement adjusting member 220a
4 (b) and 4 (c), it moves upward, and the engagement state between the engagement adjusting member 220a and the engagement hole 320b is released. When the engagement state is released, the notice state engaging protrusion 221 is engaged with the notice state engaging portion 330 as shown in FIG.

In the structures shown in FIGS. 15 (a), (b) and (c) which show the notice of a decrease in gas pressure, the turning plate 323 is fixed to the turning shaft 322, and as shown by arrows. Energized clockwise. The rotation plate 323 has an engagement hole 320b provided eccentrically with respect to the rotation shaft 322. A groove-shaped decompression notice guide 321 is formed in a counterclockwise direction from the engagement hole 320b. The edge of the decompression notice guide 321 is a notice state engaging part 330. 220b is an engagement adjusting member formed of a round bar,
A notice state engaging projection 222 is formed at the center of the tip.

Operation When the gas pressure in the case 10 is in a specified pressure state,
As shown in FIGS. 15A and 15B, the engagement adjusting member 220
b is in the state of being inserted into the engagement hole 320b, and the engagement adjustment member 2
20b is engaged with the engagement hole 320b. Case 1
When the gas pressure in 0 becomes low, the bellows 21 expands. As the bellows 21 expands, the engagement adjusting member 220b
5 (b) and (c), it moves upward, and the engagement state between the engagement adjustment member 220b and the engagement hole 320b is released.
As the engagement state is released, the notice state engagement protrusion 222 passes through the decompression notice guide section 321 as shown in FIG.
It is engaged with the notice state engaging portion 330 to enter the notice state.

In the structures shown in FIGS. 16 (a), (b) and (c) which show the notice of a decrease in gas pressure, the turning plate 323 is fixed to the turning shaft 322, and as shown by arrows. Energized clockwise. The rotating plate 323 has an engagement notch recess 320c formed at an edge thereof. The counterclockwise end of the engagement notch 320c is an engagement step 320d. The decompression notice guide portion 32 cut out in a counterclockwise direction from the engagement notch recess 320c through the engagement step portion 320d.
1 is formed. A notice state engaging portion 330 is formed at an edge of the decompression notice guide portion 321 in a counterclockwise direction.

Reference numeral 220c denotes an engagement adjusting member which is formed by a round bar, and has a notch 224 formed at a half at a required depth at the tip, and a notice state engagement projection 223 formed by the remaining portion. The engagement adjusting member 220c is configured such that the notch 224 faces the rotation shaft 322 side.
Are located in

Operation When the gas pressure in the case 10 is in the specified pressure state,
As shown in FIG. 16A, the engagement adjusting member 220c is engaged with the engagement step 320d. When the gas pressure in the case 10 decreases, the bellows 21 expands. Bellows 21
16A, the engagement adjusting member 220c is
In (b), the engagement adjusting member 22 is moved in the paper
The engagement state between Oc and the engagement step portion 320d is released. When the engagement state is released, the notice state engagement protrusion 223 passes through the depressurization notice guide section 321 and is engaged with the notice state engagement section 330 to be in the notice state.

It should be noted that the present invention is not limited to the embodiment shown in FIGS. 13 to 16 and is not limited to the embodiment shown in FIG. Many modifications are possible within the description of the range.

[0047]

The present invention has the above-mentioned structure and has the following effects. (A) Before the pressure of the gas sealed in the gas switch drops to the lock operation pressure at which the operation handle is locked, the gas pressure is between the specified pressure and the lock operation pressure, and in the near future, the gas switch Since it is possible to display in advance that the operation handle of the device is locked and the opening / closing operation cannot be performed, it is possible to make preparations and measures with a margin in advance such as replacing the gas switch.

(B) With the reduced pressure display device, a decrease in gas pressure can be visually recognized even at the site. In addition, the use of the electrical contacts enables a distant business office, monitoring station, or the like to confirm the display of a notice of a decrease in gas pressure.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire gas switch according to the present invention.

FIG. 2 is a side view of the gas switch shown in FIG.

FIG. 3 is an explanatory sectional view of a pressure detecting device and a pressure reducing display device.

FIG. 4 is an explanatory diagram showing a relationship between a pressure detecting device and a pressure reducing display device with a display cover removed.

FIG. 5 is a sectional view taken along line AA of the operating member shown in FIG. 4;

FIG. 6 is a sectional view showing another embodiment of the operation member shown in FIG. 5;

FIG. 7 is a partially cutaway explanatory view of a decompression display device and a lock device of an operation handle.

FIG. 8 is a schematic explanatory diagram viewed from a direction C in FIG. 7;

FIG. 9 is a schematic explanatory view of a main part viewed from a direction D in FIG. 8;

FIG. 10 is an explanatory diagram showing a correlation between the movement of the operating member and the movement of the interlocking plate in accordance with a change in gas pressure in the gas switch, and showing a specified pressure state.

FIG. 11 is an explanatory diagram showing a correlation between the movement of the operating member and the movement of the interlocking plate in accordance with a change in the gas pressure in the gas switch, and showing a notice state of pressure reduction.

FIG. 12 is an explanatory diagram showing a correlation between the movement of the operating member and the movement of the interlocking plate in accordance with a change in gas pressure in the gas switch, and showing a locked state of the operation handle.

FIG. 13 is an explanatory view showing another embodiment of the structure showing a gas pressure drop notice.

FIG. 14 is an explanatory view showing another embodiment of the structure showing a notice of a decrease in gas pressure.

FIG. 15 is an explanatory view showing another embodiment of the structure showing a notice of a decrease in gas pressure.

FIG. 16 is an explanatory diagram showing another embodiment of the structure showing a notice of a decrease in gas pressure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas switch 10 Case 11 Operation handle 2 Pressure detecting device 21 Bellows 22 Operating rod 220, 220a, 220b, 220c Engagement adjustment member 221, 222, 223 Notice state engagement projection 224 Notch 23 Engagement adjustment member 3 Pressure reduction display Device 310 Engagement part 32 Operating member 320 Engagement part 322 Rotation axis 323 Rotation plate 33 Display cover 34 Interlock plate 340 Display part 341 Engagement part 36 Interlock plate axis 360 Engagement part 4 Lock device 40 Release claw 41 Pivot axis 42 Interlocking plate engaging part 43 Lock member engaging part 45 Lock member 450 Lock body 451 Stopper pin 48 Spring

Claims (2)

(57) [Claims] When the pressure of a gas sealed in a gas switch falls to a lock operating pressure for locking an operation handle, this is detected, this state is displayed, and the operation handle is locked. Display method of the gas pressure drop of the gas switch, which is bent at two places with an obtuse angle and three display parts (340
a, 340b, 340c) with the elongated display panel (340)
The interlock plate having (34), when the pressure of the sealed gas is specified pressure, the display board (340)
The normal display section (340c) colored in green or the like is displayed on the display window (50) , and when the pressure of the charged gas decreases and is between the specified pressure and the lock operation pressure, Due to the expansion of the bellows, the interlocking plate (34) is rotated, and the notice display portion (340
b) is to be displayed in the display window (50), when the pressure of the sealed gas is in the locked operating pressure decreases further, interlock plate (34) is further rotated by the expansion of the bellows, the table
Vacuum display that is colored red or the like (340a) a table of示板(340)
A method for displaying a decrease in gas pressure of a gas switch, wherein the display is displayed on a display window (50) . 2. A pressure detector for detecting that the pressure of a gas sealed in a gas switch has fallen below a prescribed pressure.
And a lock device (4) that locks the operation handle when the pressure of the charged gas drops to the lock operating pressure. The pressure detector (2) has a bellows (21), an operating rod (22) that moves by expansion of the bellows (21) when the pressure of the sealed gas decreases, and a screw structure. To correct the amount of movement of the operating rod (22).
The engagement adjustment member (23) is urged in the rotational direction with the engagement adjustment member (23) to engage the engagement adjustment member (2) of the operating rod (22).
An operating member (32) having an engaging concave portion (320) engaging with 3) and a notice state engaging portion (330), and the pressure reducing display device (3) includes an operating member (32). Rotate in conjunction with two places with an obtuse angle
It is bent to form three display parts (340a, 340b, 340c).
The display panel (340) has an elongated display panel (340) at the tip.
Is a normal display section (340c) colored in green or the like, a notice display section (340b) colored in yellow or the like indicating that the pressure of the charged gas is between the specified pressure and the lock operation pressure, and red. Wear with
A colored decompression display section (340a) is provided, and each display section (3
40a, 340b, includes interlock plate to be displayed on the 340 c) a display window (50) to (34), when the pressure of the sealed gas is specified pressure, the engaging adjustment member of the actuating rod (22) (23) The engagement recess (320) engages with the display window (50).
The normal display section (340c) of the display panel (340) is displayed on the display, and when the pressure of the charged gas decreases and falls between the specified pressure and the lock operating pressure, the operating rod (22) moves and engages. The engagement between the engagement adjusting member (23) and the engagement concave portion (320) is released, the operating member (32) and the interlocking plate (34) rotate, and the engagement adjusting member (23) is moved to the notice state engagement portion ( Three
Predictive display portion of the display panel to engage the display window 30) (50) (340) (3
40b) is displayed, and when the pressure of the charged gas is further reduced to the lock operating pressure, the operating rod (22) moves and the engagement adjusting member (23) moves from the pressure-reducing notice guide section (321). The operating member (32) and the interlocking plate (34) rotate, and the display window (50) displays the decompression display (340a) of the display plate (340 ).
Wherein the gas switch is displayed.