JPH0117079Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a pneumatic switch with a current-limiting fuse enclosed in a case and equipped with an open-phase prevention mechanism.

[Prior art] Conventionally, in a metal-clad type switch with a current-limiting fuse, a disconnecting section is provided in series with the load switching section, and a current-limiting fuse for closing the disconnecting section is removably attached to the inner surface of the lid case. A new version has been proposed (Jikko No. 57-12525).

Also, a device that is separate from the lid case has been proposed (Utility Model Publication No. 57-52827).

However, in the above structure, the load switching section and the disconnection section are separate parts, which increases the size of the entire device, and the above structure does not have a fuse open phase prevention mechanism. First, there was the problem that the structure would become complicated to incorporate.

[Purpose of the invention] This invention was made in order to solve the above-mentioned problems, and its purpose was to reduce the size of the air switch with a metal-clad current limiting fuse, and to provide a mechanism to prevent open phase. The phase-opening prevention mechanism and the external operating handle are free, allowing the phase-opening prevention mechanism to operate easily and reliably.Furthermore, when the switch is closed, the bottom box of the case can be locked to lock the switch. To provide an air load opening/closing part with a current-limiting fuse enclosed in a case, which makes the on/off state clear and ensures safety in fuse replacement work.

[Structure of the invention] The switch of this invention consists of a main body case and a bottom box that is removably sealed against the lower part of the main case, and inside the case there is a cutoff part consisting of a current limiting fuse and a load switching part. and an operating mechanism that opens and closes the load in conjunction with an operating handle provided outside the case, and when the operating mechanism is in the closed state, it engages with a latch member provided on the bottom box. In a current limiting fuse pneumatic switch equipped with a locking member that makes it impossible to remove the bottom box and separates from the locking member when the load is opened or the fuse is cut off, the switch is rotated in conjunction with the blowing of the fuse. A driven lever and a loading holding lever are connected, and a locking pin that is engaged with the hook of the loading holding lever is provided at one end of a locking member provided on a part of the main body case, and a locking pin that is engaged with the hook portion of the loading holding lever is provided at the other end. The gist thereof is to provide a hook portion that engages in the locking hole of the provided locking member, and to link the locking member to a spring that urges the hook portion in the direction of detachment from the locking hole. It is something.

[Example] An example embodying this invention will be described below with reference to FIGS. 1 to 12.

A main body case 2 constituting a case 1 of the switch has a housing groove 3 formed by bending from a side wall over the entire lower end inner surface, and a packing 4 is fitted and fixed inside the housing groove 3. A plurality of mounting plates 5 are welded and fixed to the lower outer periphery of the main body case 2 at appropriate intervals. The bottom box 6, which constitutes the case 1 together with the main body case 2, is formed into a bottomed box shape so as to cover the lower end opening of the main body case 2, and contacts the packing 4 at the upper edge of the bottom box to seal the inside of the main body case 2. It is becoming possible to do so.

The bottom box 6 has a tightening plate 7 protruding from its outer periphery in correspondence with the mounting piece 5. A tightening bolt 8 is inserted through both the tightening plate 7 and the mounting plate 5.
The bottom box 6 is removably attached to the main body case 2 by fixing the tightening plates 7 to the mounting plates 5 through sleeves in cooperation with nuts 9 screwed into the lower ends of the housings.

A mounting bracket 10 for attaching to an arm is provided on the upper surface of the main body case 2, and bushings 11 and 12 on the power supply side and load side are fixedly penetrated in an airtight manner on each side of the main body case 2, respectively, for each phase. Attachment conductors 15, 16 are fixed to the inner ends of each of the bushings 11, 12, which are connected to lead wires 13, 14 led out from their outer ends.

A pair of channel-shaped support plates 17 are fixed to the inner top surface of the main body case 2, and a mounting base 18 is bent and formed on the lower surface of the support plates 17 so that the lower surface thereof protrudes into a V-shaped cross section. A pair of left and right cross sections inverted L
It is fixed via letter-shaped fixed frames 19 and 20, and power supply side support insulators 21 are fixed to one slanted surface of each phase for each phase, and the other slanted surface has a support insulator 21 for each phase. Load-side support insulators 22 for each phase are arranged to form a V-shape, respectively.
is fixed.

An arc extinguishing chamber 23 is fixed at the tip of the support insulator 21, and a fixed interposed electrode (not shown) is fixedly installed inside the arc extinguishing chamber 23. The mounting conductor 15 of the bushing 11 is connected to the bushing 11 via the power supply side terminal 24 led out further upward.
It is connected to the.

A vertically extending fuse support base 25 is integrally formed at the tip of the load side support insulator 22 in an oblique shape so that its upper end is inclined toward the support insulator 22 side from its lower end. Upper and lower fuse fixing contact pieces 2 are provided at each of the upper and lower ends of the fuse support stand 25.
6 and 27 are tightened and fixed by screws 28, and a current limiting fuse 77 serving as a cutoff portion is sandwiched and brought into contact with the screws 28.

A base end portion of a movable contact blade 29, which corresponds to the fixed interposed electrode (not shown) so as to be able to approach and separate from it, is rotatably attached to one side of the fuse support base 25 near the lower end. The lower end portion of a conductive plate 30, which also constitutes a terminal plate, is superimposed on the upper surface of the base end of the lower fuse fixing contact piece 27 and is screwed with the screw 28. Further, a connecting portion 31 is bent and extended from one side of the upper end of the conductive plate 30 and is fixed between the base end of the movable contact blade 29 and the fuse support base 25.
It is electrically connected to the movable contact blade 29. A terminal plate 32 is superimposed on the lower surface of the upper fuse fixed contact piece 26 and screwed with the screw 28, and the tip of the terminal plate 32 is connected to the mounting conductor 1.
6.

A driven lever 33 is pivotably supported at the center of the lower end of the fuse support base 25 so as to be rotatable. A connecting rod 3 made of an insulating material such as synthetic resin is disposed at one end of the driven lever 33 at a position corresponding to between the supporting insulators 21 and 22.
4 is rotatably attached to the center of the movable contact blade 29, and one end of a push-down rod 35 made of an insulating material such as synthetic resin is rotatably attached to the center of the movable contact blade 29. .

An operating shaft 3 is provided between the fixed frames 19 and 20.
6 is rotatably installed, and a base end portion of a drive member 37 is fixed near the center of the operating shaft 36, as shown in FIG. In addition, in the positions corresponding to the respective power supply side support insulators 21, there are shown in FIGS.
As shown in the figure, a base end of a connecting lever 38 rotatably pivoted to the other end of the push-down rod 37 is fixed. As shown in FIG. 10, the driving member 37 has an opening spring 39 whose one end is hung on the mounting base 18 and the other end of which is hung, and a stopper 4 with the driving member 37 fixed on the mounting base 18.
A spring force is applied to the operating shaft 36 to rotate it in the opening direction so as to bring it into contact with the operating shaft 36.

The movable contact blade 29, the push-down rod 35, and the operating shaft 3
6, drive member 37, connection lever 38, release spring 3
9 constitutes an opening/closing section.

As shown in FIG. 9, a mounting shaft 42 is supported at the tip of a support member 41 fixed to protrude in an L-shape from one side of the fixed frame 20 toward the main body case 2, and at the upper part of the fixed frame 20. has been done.
As shown in FIG. 9, a closing holding lever 43 is rotatably inserted and supported at both ends of the mounting shaft 42. As shown in FIG. The other end of a locking spring 44, which is wound around the mounting shaft 42 and has one end locked to the support member 42, is connected to the closing lever 43, and the other end of the locking spring 44 is wound around the mounting shaft 42, and the other end of the locking spring 44 is locked in the counterclockwise direction in FIG. It is designed to be biased to rotate.

Further, one end of the input holding lever 43 extends downward, and an engagement recess 45 serving as a locking portion is formed in one side of the center thereof. Further, on the other side of the closing holding lever 43, a driven plate portion 46 that projects toward the frame 20 in an L-shape is formed. or,
A locking piece 47 is formed from the side of one end of the input holding lever 43 and protrudes outward in a channel-like cross-section so as to bypass the tip of the support member 41 .

An open shaft 48 is rotatably installed between the fixed frames 19 and 20 above the power source side support insulator 21 so as to be parallel to the operating shaft 36,
An abutment part 48a is bent into an L-shape at one end projecting outward from the fixed frame 20 and is adapted to abut against the driven plate part 46 of the locking member. Further, each of the power supply side supporting insulators 21 of the open shaft 48
A base end portion of an operating link 49 whose distal end portion is pivotably supported relative to the other end portion of the connecting rod 34 is fixed at a position corresponding to .

The driven lever 33, the connecting rod 34, the operating link 49, the opening shaft 48, and its abutting portion 48a constitute an open phase prevention drive mechanism.

A locking link 5 constituting a locking member is provided at one end of the operating shaft 36 protruding from the fixed frame 20.
0 is fixed, and a latch pin 51 formed to be able to engage in the engagement recess 45 of the closing holding lever 43 projects from the tip of the latch link 50, and the latch pin 51 is engaged. When engaged and locked in the recess 45, the operating shaft 36 is held in the closed state.

Similarly, a connecting link 52 constituting a locking member is fixed to one end of the operating shaft 36 so as to form an obtuse angle with the latching link 50. Connecting link 5
A sliding pin 53, which also constitutes a locking member, is protruded from approximately the center of the locking plate 2, and a locking plate 5, which constitutes a locking member, extends downward at the lower end.
4 is fixed. When the operating shaft 36 is in the closed state, the lock plate 54 is a hook provided at the lower part of the latch hole 56 in the upper part of the latch plate 55, which is a latch member protruding from the bottom box 6. Part 54
a is engaged to prevent the bottom box 6 from separating from the main case 2.

A support plate 57 extending downward is fixed to the inner top portion of the main body case 2 so as to be located between the side wall of the main body case 2 and the fixed frame 20. A handle shaft 58 is rotatably installed between the main body case 2 and the support plate 57 below the operating shaft 36, and a handle 59 is fixed to the outer end protruding from the main body case 2.

An actuating lever 60 is fixed to the inner end of the handle shaft at approximately the center thereof, and a pair of opposing first links 61 are rotatably attached to one end of the handle shaft at their proximal ends. A long hole 62 is transparently provided at the tip of the first link 61 along its longitudinal direction, and both ends of the sliding pin 53 of the connecting link 52 are slidably installed in the long hole 62, The connecting link 52 is allowed to open, and the first link 61 driven by the rotation of the operating lever 60 is allowed to move upward when the handle shaft 58 is opened.

Further, when the handle shaft 58 is closed, the upper end of the elongated hole 62 engages with the sliding pin 53 due to the downward movement of the first link 61 driven by the clockwise rotation of the operating lever 60, thereby closing the connecting link 52. direction (in FIG. 4, it rotates clockwise).

A release shaft 63 is rotatably supported on the side wall of the main body case 2 in correspondence with the closing holding lever 43, and a release lever 64 is fixed to the inner end of the release shaft 63. A release pin 65 is provided on one side of the lower part of the release lever 64 and protrudes to be able to engage with the locking piece 47 of the release holding lever 43, and the release lever 64 is connected to the upper part of the release lever 64. A spring 66 is attached to the spring 66, which urges the release member 43 in a direction opposite to the release direction (counterclockwise in FIG. 4). Note that 64a is the release lever 64.
This is a stopper that is provided so as to be engageable with one side of the upper part of the spring 66, and is adapted to restrict the rotation of the spring 66 in the opposite direction of release.

A second link 6 is located on the other side of the lower part of the release lever 64.
7 is rotatably pivoted at the base end thereof, and a shaft 69 protruding from the other end of the operating lever 60 is inserted into a long hole 68 formed transparently along the longitudinal direction at the distal end of the second link 67. are slidably arranged. The elongated hole 68 is formed to allow rotation of the operating lever 60 in the clockwise direction when the handle shaft 58 is closed.

A mounting plate 70 is fixed to the handle shaft 58, and the main body case 2 is mounted on both sides of the lower part of the mounting plate 70.
A pair of tension springs 71 and 72, one end of which is fixed to the opposite side walls of the spring, and the other end of each of the tension springs 71 and 72 are fixed to the opposite side walls of the spring.

That is, as shown in FIG. 4, the handle shaft 58 is always held in a neutral position by the tension springs 71 and 72, and is held in a neutral position by the tension springs 71 and 72, and is Since the first link 61 is connected, the open phase prevention mechanism is free.

The handle shaft 58, operating lever 60, first link 61, long hole 62, release lever 64, second link 67, long hole 68, shaft 69, mounting plate 70, tension springs 71, 72, connecting link 52, sliding The pin 53 constitutes an operating mechanism.

In the main body case 2, a pointer shaft 73 is rotatably supported at a position corresponding to the operating shaft 36 so as to coincide with the axis of the operating shaft 36. Similarly, a pointer 74 that displays "on" and "off" is fixed to the outer end of the pointer shaft 73, and a pointer lever 75 disposed along the connecting link 52 is fixed to the inner end. The tip is rotatably supported by the sliding pin 53.

Now, the operation of the switch configured as described above will be explained.

Load Opening When the latching pin 53 of the latching link 50 is locked by the engagement recess 45 of the closing holding lever 43 as shown in FIG. 4, the movable contact blade 29 is in the closed state as shown in FIG. It's getting old. In this state, when the handle 59 is manually rotated in the opening direction (counterclockwise in FIG. 4) against the biasing force of the tension spring 71, the operating lever 60 is rotated in the same direction via the handle shaft 58. Rotated. Along with this, the shaft 69 of the operating lever 60 is inserted into the elongated hole 6.
At the same time, the release lever 64 is rotated clockwise against the biasing force of the spring 66, and the release pin 65 is engaged with the lower end of the closing holding lever 43. It engages with the locking piece 47 (see FIG. 5).

If you still turn the handle 59 in the opening direction,
Since the release pin 65 rotates the closing holding lever 43 in the release direction (clockwise in FIG. 5), the latching pin 51 is released from the engagement recess 45 (see FIG. 6). As a result, the latching link 50 becomes free, so that it is rotated together with the operating shaft 36 to the state shown in FIG. The range of rotation is restricted by contact. At this time, the lock portion 54a of the lock plate 54 fixed to the latch link 50 separates from the latch hole 56 of the latch plate 55, and the bottom box 6 is unlocked.

When the operation shaft 36 rotates in this manner, each of the connecting levers 38 fixed thereto also rotates at the same time, and the push-down rod 35 is pushed down. Then, the movable contact blades 29 of each phase are simultaneously opened by the operation of the push-down rod 35. On the other hand, the connecting link 5
Since the sliding pin 53 is also rotated in the same direction by the opening rotation of 2, the sliding pin 53 causes the pointer lever 75 to rotate in the same direction as the pointer shaft 73, and the pointer 74 is operated to display "off".

When the operating force on the handle 59 is released after the movable contact blade 29 has opened as described above, the handle 59 returns to the neutral state as shown in FIG. 7 due to the biasing force of the tension spring 71, and as shown in FIG. As the handle 59 is rotated back, the release lever 64 rotates until it is stopped by the stopper 64a by the biasing force of the spring 66.

As a result, the closing holding lever 43 is moved by the locking spring 44.
Due to the urging force, it returns to the state shown in FIG. 7, and at the time of the next closing operation, it can engage with the locking pin 51 and maintain the closed state.

When the tightening bolts 8 that fasten the bottom box 6 to the main case 2 in this open state are removed, the bottom box 6 can be removed from the main case 2.

Closing Next, when the handle 59 is rotated in the closing direction (clockwise in FIG. 7) from the state shown in FIG. , and the first link 61 moves downward.

As the first link 61 moves downward, the upper end of the elongated hole 62 engages with the sliding pin 53 and drives the connecting link 52 in the closing direction, thereby moving the connecting lever 38 in the same direction via the operating shaft 36. Rotate. As a result, the push-down rod 35 is pulled up and the movable contact blades 29 of each phase are simultaneously engaged. And operation axis 3
6 is rotated, the latch link 50 is also rotated in the same direction, and the latch pin 51 is connected to the closing holding lever 4.
When the movable contact blade 29 is engaged with the engagement recess 45 of No. 3 and locked, the movable contact blade 29 is held in the closed state.

On the other hand, since the sliding pin 53 is also rotated in the same direction due to the closing rotation of the connecting link 52, the sliding pin 53 is rotated in the same direction.
3, the pointer lever 75 is rotated in the same direction as the pointer shaft 73, and the pointer 74 is operated to indicate "on".

After the movable contact blade 29 is turned on as described above and the latching pin 51 of the latching link 50 is engaged and locked in the engagement recess 45 of the closing holding lever 43, when the operating force of the handle 59 is released, the handle 59 returns to the neutral state as shown in FIG. 4 due to the biasing force of the tension spring 72.

Note that when the handle 59 is turned in and out, the shaft 69 of the operating lever 60 moves upward via the handle shaft 58, but since the shaft 69 only slides in the elongated hole 68, the second link 67 is not driven. Release lever 6
4 doesn't work either.

Fuse cutoff Next, when the current-limiting fuse 77 for at least one phase is blown in the closed state shown in FIG. 4, and the striker 78 built into the blow-out display device protrudes with a predetermined force as shown in FIG. 33 is rotated,
Push up the connecting rod 34. Then, due to this operation, the opening shaft 48 is moved to the first position via the operating link 49.
The contact portion 48a rotates the driven plate portion 46 of the closing holding lever 43 upward as shown in FIG. 2.

Then, the closing holding lever 43 rotates so that its engagement recess 45 is disengaged from the latching pin 51 of the latching link 50. Therefore, the latch link 50 is released, and the operating shaft 3 is released by the urging force of the release spring 39.
6 and the drive member 37 is rotated until it comes into contact with the stopper 40 as shown in FIG. below,
As with manual operation, the movable contact blades 29 are opened simultaneously for each phase, and no phase loss occurs.

Also, the lock plate 54 of the latch link 50 has its lock portion a connected to the latch hole 5 of the latch plate 55 in the same manner as in manual operation.
6 to release the lock on the bottom box 6, and the pointer 74 is driven by the connecting link 52, sliding pin 53, pointer lever 75, and pointer shaft 73 to turn off.
Display works.

At this time, the sliding pin 53 moves upward via the connecting link 52 when the operation shaft 36 is rotated to open.
Since the sliding pin 53 only slides in the elongated hole 62, the first link 61 does not operate, and therefore the operating lever 6
0, the handle shaft 58 and handle 59 also do not operate.

Therefore, as mentioned above, when the current limiting fuse 77 is blown, the protruding force of the striker 78 of the fusion display device is applied to the driven lever 33, the connecting rod 34, the operating link 49, the opening shaft 48, and their respective parts, which constitute the open phase drive mechanism. Since the protruding force is not transmitted to the contact portion 48a and transmitted to the first link 61, the operating lever 60, the handle shaft 58, and the handle 59 and is not dispersed, the phase loss prevention mechanism can be operated easily and reliably. can.

In addition, when this switch is turned on, the bottom box 6 is locked and the bottom box 6 cannot be opened. Therefore, the bottom box 6 will not be accidentally opened when the switch is turned on, and the fuse replacement work will be easier. Safety can be ensured.

[Effects of the invention] As detailed above, this invention allows the current-limiting fuse-equipped air switch to be used outdoors, and also allows the operation handle to be free when the phase-opening prevention mechanism operates, making it easier to operate the phase-opening prevention mechanism. Furthermore, this is an excellent industrial idea because it can be carried out reliably, and when the switch is in the closed state, the bottom box of the case is locked to ensure the safety of the fuse replacement work.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of an embodiment embodying this invention, Fig. 2 is a side sectional view, Fig. 3 is a bottom sectional view of the operating mechanism, and Fig. 4 is a side sectional view also showing the closed state. FIG. 5 is a side sectional view of the opening operation being performed by manual operation, FIG. 6 is a side sectional view of the closing holding lever in the unlocked state, FIG. 7 is a side sectional view of the operating mechanism in the released state, and FIG. The figure is also a side sectional view during the closing operation, FIG. 9 is a perspective view of the loading holding lever, and
0 is a cross-sectional view of the mounting base, FIG. 11 is a side view showing the open state by manual operation, and FIG. 12 is a side view showing the open state when the fuse is blown. DESCRIPTION OF SYMBOLS 1... Case, 2... Main body case, 6... Bottom box, 18... Mounting base, 21... Power side support insulator, 22... Load side support insulator, 29... Movable contact blade, 33... Driven Lever, 34...Connection rod,
35... Push-down rod, 36... Operation shaft, 38... Connection lever, 43... Closing holding lever, 48... Opening shaft, 49... Operating link, 50... Latching link constituting the locking member. 51...Latching pin, 52
...Connection link constituting the lock member, 53...
A sliding pin constituting a lock member, 54...a lock plate constituting a lock member, 54a...a hook portion,
55... Hanging plate as a hanging member, 58... Handle shaft, 59... Handle, 60... Operating lever, 61... First link, 62... Elongated hole, 64...
...Release lever, 67...Second link, 68...Elongated hole, 71, 72...Tension spring, 77...Current limiting fuse, 78...Striker.

Claims (1)

[Scope of Claim for Utility Model Registration] The case 1 is composed of a main case 2 and a bottom box 6 that is removably sealed against the lower part of the main case 2, and inside the case 1 there is a cutoff section consisting of a current limiting fuse and a load switching section. An operating mechanism is provided which opens and closes the load in conjunction with an operating handle provided outside the case 1, and when the operating mechanism is in the closed state, a latching member provided on the bottom box 6 is provided. 55 to make it impossible to remove the bottom box 6,
Locking members 50, 52, 5 that separate from the latching member 55 when the load is opened or the fuse is cut off.
3, 54, the driven lever 33 and the closing holding lever 43, which are rotated in conjunction with each other based on the blowing of the fuse, are connected and provided in a part of the main body case 2. lock member 50,
The input holding lever 4 is attached to one end of 52, 53, 54.
A locking pin 51 is provided at the other end to be engaged with the hook portion 54a of the bottom box 6.
A hook portion 54a is provided to be engaged in the locking hole 56 of the lock member, and the lock members 50, 52, 53, and 54 are connected to a spring 39 that urges the hook portion 54a in the direction of detachment from the locking hole 56. An air switch with a current-limiting fuse.