JPH0334011Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention enables slow-closing operation of circuit breakers, especially circuit breakers of the closing spring storage type with quick-on and fast-off structures, during maintenance and inspection. The present invention relates to a circuit breaker constructed as described above.

[Conventional technology]

Generally, in a circuit breaker equipped with a closing spring storage type operating mechanism, the closing spring is closed in the stored state to prevent release of the closing spring in order to enable slow closing operation as required during maintenance and inspection. A device in which a spring release prevention member is added has been implemented.

Conventional examples of circuit breakers, which form the background of this invention, are shown in FIGS. is the circuit breaker body 10
0, the extraction fixing frame 101, the front cover 49 of the circuit breaker body, and the extraction roller 10 attached to the circuit breaker body 100 via the mounting member 102.
3, and an extraction rail 104 that is attached to the extraction fixing frame 101 and slidably supports the circuit breaker 101 by an extraction roller 103.

The worm wheel shaft 105 is connected to the circuit breaker body 1
00, and a worm wheel 106 is integrally attached to the left side of the center. This worm wheel 106
A worm shaft 108 connected to a worm 107 that meshes at right angles with the worm shaft 108 is disposed corresponding to an extraction operation hole 109 provided in the front cover 49. In addition, the front end surface of the worm shaft 108 and the extraction operation hole 10
9, a shutter plate 110 is provided to prevent careless extraction operations. The worm wheel shaft 105 is connected to the frame on the circuit breaker main body 100 side.
It is rotatably supported on the arm, and there are extractor levers 1 on both ends
11 is installed. An extraction lever guide groove 114 of a guide member 113 in which an extraction lever roller 112 is attached to the extraction fixing frame 101 is fitted into the extraction lever 111 . When extracting, insert an operating handle (not shown) into the extraction operating hole 109, connect it to the worm shaft 108, and rotate the worm shaft 108, and the worm 107 and worm wheel will be connected to each other. The worm wheel shaft 105 is rotated via the wheel 106, and the worm wheel shaft 105
The extraction lever row attached to the extraction levers at both ends of the
Since the lever 112 slides and presses the extraction lever guide groove 114, the extraction operation of the circuit breaker 100 is performed. Further, by rotating the worm shaft 108 in the opposite direction, the circuit breaker main body 100 is inserted. As shown in FIG. 9, the worm wheel 106 is supported between a pair of corresponding support members 115 with a gap on the side of the circuit breaker main body, and a worm wheel 106 rotatably passes through the support members 115. A worm wheel 106 is attached to the worm wheel shaft 105, and a worm 107 that meshes with the worm wheel 106 is attached to the bearing member 1.
Supported by 16. The worm shaft 108, which is integrally connected to the worm 107, is connected to the front cover.
It extends so as to correspond to the extraction operation hole 109 of No. 49.

FIG. 10 is a partial side sectional view showing the positioning locking mechanism of the circuit breaker body locked at the connected position. The positioning lock cam 117 is mounted integrally with the cam wheel shaft 105, and is provided with positioning grooves 117a, 117b, and 117c on the periphery of the positioning lock cam 117 for stopping at each of connection, test, and disconnection positions.

The positioning lock lever 118 is shown in FIG.
As shown in FIG. 2, it has parallel arms 118a and 118b, and a connecting portion 118c at the tip of the arm 118a.
The positioning lock lever 118 is rotatably supported on a pair of support frame members 115 by a shaft 119, and the arm 11 is integrally connected to the arm 118b.
A positioning lock pin 120 is attached to the other end of the positioning lock cam 117, and the positioning lock pin 120 is inserted into each positioning groove 117a, 117b, 117b of the positioning lock cam 117.
117c and the circuit breaker body 100 at each extraction position. The stopper pin 121 is a U-shaped support member 123 attached to the support member 122.
The stopper operating plate 124 is provided so as to slidably pass through the worm shaft 108 so that its lower end corresponds to the worm shaft 108, and its upper end is connected to a stopper operating plate 124 that engages with the connecting portion 118c of the positioning lock lever 118. The stopper spring 125 always biases the stopper pin 121 in a direction that always presses the worm shaft 108, and the positioning lock release lever spring 12
6 (see FIG. 11) is always biased to rotate the positioning lock lever 118 counterclockwise. A stopper pin 121 is attached to the worm shaft 108.
An engagement groove 126 is provided every 1/4 rotation in correspondence with
The engagement groove 1 between the stopper pin 121 and the worm shaft 108 is synchronized with the time when the lock pin 121 engages with each positioning groove of the positioning lock cam 117.
26 are provided.

11 to 14 are related explanatory diagrams showing the positioning lock release device, FIG. 11 is a side view showing the positioning lock release lever in the locked position, and FIG. 12 is the part shown in FIG. 11. Plan view, Figure 13 is the 1st
FIG. 1 is a partial bottom view of FIG. 1, and FIG. 14 is a side view showing the positioning release lever in the release position. The positioning release lever 127 is bent into a U-shape on the inner end side, and is attached to the support frame member 1 by a shaft 128.
The parallel first arm 1 is rotatably supported by 15.
One end of the second arm 118a is exposed on the front surface of the front cover 49 to form an operating handle, and the tip of the second arm 118b is the arm 118b of the positioning lock lever 118.
It is provided so as to correspond to the engaging element 129 provided at the tip of. The positioning lock release lever spring 126 is installed between the positioning lock release lever 127 and the positioning lock lever arm 118b,
The positioning lock release lever 127 is always biased clockwise. The foot lever 130 is rotatably supported at the center by the worm wheel shaft 105.
Engagement groove 130a at one end and hook portion 130b at the other end
The engagement groove 130a is connected to an opening/closing position detection pin 131 mounted on an opening/closing crossbar that integrally connects movable contact devices of a circuit breaker, for example, in order to detect the opening/closing position. Hook part 1
31b engages with the tail end of the shutter lever 132,
It is set up so that they can be released at will. This shutter lever 132 is a first arm 13 equipped with a shutter plate 110 for opening and closing the extraction operation hole 109 at one end.
2a and a pair of support members 115 apart from the connecting portion 13.
The other end of the second arm 132c integrally connected by the second arm 2b is rotatably supported by a shaft 133 corresponding to the hook portion 130b of the hook lever 130. The connecting plate 134 is connected to the second shutter lever 132.
and the arm 118a of the positioning lock lever 118, and is connected to the positioning lock lever 118a by a pin 135, and the long groove 134a of the connecting plate 134 and the shutter lever 13
2c are loosely connected by a pin 136.
In the state shown in FIG. 11, if the circuit breaker is in the open position, the hook lever 130 is in the position shown by the two-dot chain line, and the hook portion 130b of the hook lever 130 is disengaged from the tail end of the shutter lever 132c. It's dark. When the handle of the positioning lock release lever 127 is pushed down in this state, it rotates about the shaft 128, and the second arm 127b engages with the engager 129 of the positioning lock lever 118 to push up the positioning lock lever 118.
The shaft 119 is rotated clockwise as a fulcrum to disengage the lock pin 120 of the positioning lock lever 118 and the positioning groove of the positioning lock cam 117, and then remove the reinforcing stopper pin 121 and the worm shaft 108 as shown in FIG. is disengaged from the engagement groove 126. In addition, the positioning lock lever 118
The rotation pushes down the shutter lever 132 via the connecting plate 134 and rotates the shutter lever 132 clockwise about the shaft 133 to open the shutter plate 110 that closes the extraction operation hole 109.
A first part that can perform an extraction operation by connecting an operation handle to the worm shaft 108 from the extraction operation hole 109.
The state shown in Figure 4 will be obtained.

That is, when the circuit breaker is closed, the release operation by the positioning release lever 127 is blocked, and when the circuit breaker is opened, the positioning release lever 127 is operated to release the positioning lock and open the shutter plate 110 that blocks the extraction operation hole 109. It is configured as follows.

FIG. 15 is a side view in central section of the circuit breaker main body 100 in the closed state, FIG. 16 is a side view showing the closing spring in the charged state, FIG. 17 is a side view showing the closing spring in the released state, and FIG. 18 19 is a partially sectional center view showing the tripped state, FIG. 19 is a partially sectional side view showing the reset (open circuit) state, and FIGS.
Figure 2 is a side view showing the closing spring storage mechanism,
Figure 20 shows the state of starting energy storage by electric operation, the second
Figure 1 shows the state in which the charging lever is driven by electric operation, Figure 22 shows the state in which the charging lever is driven by manual operation, and Figure 23 is an exploded perspective view of the main part of the closing spring energy storage mechanism. be.

In the circuit breaker shown in FIG. 15, a fixed contact 1 and a fixed arcing contact 2 are fixed to a fixed side terminal conductor 3 for contact operation,
The movable arcing contact 5 of the movable main contact 4 is attached to the movable main contact rod 6 and the movable arcing contact rod 7 so as to be in contact with the fixed main contact 1 and the fixed arcing contact 2, respectively, and the movable contact rods 6 and 7 are connected to the movable contact shaft. The movable contact holder 9 is rotatably supported by the movable contact holder 9, and one end is connected to the movable contact rod 6,
7, the other end is formed to apply contact pressure by a contact spring 10 mounted on a contact holder 9. The movable contact holder 9 is rotatably supported on a movable contact support plate 12 by a movable contact holder shaft 11. A U-shaped flexible lead conductor 13 is connected to the movable contact rods 6 and 7 at one end and to the movable terminal conductor 14 at the other end. The arc extinguishing device 15 includes a group of arc extinguishing grids in which a large number of arc extinguishing grids 16 each having a V-shaped notch made of a well-known magnetic plate are attached to an arc extinguishing grid support 17, and a discharge port 18.
On the side, a cooling plate 19 is housed and supported within an arc extinguishing chamber cover 20 made of a molded insulator. A mold base 22 made of a molded insulator is attached to the fixed frame 21 on both the left and right sides.
A movable contact support plate 12, a fixed side terminal conductor 3, and a movable side terminal conductor 14 are mounted and supported on 2 so as to protrude outward from the rear surface. An interelectrode separator 23 made of a thin transparent insulator is provided to cover the contact device live parts of each pole from the front side toward the mold base 22.
2, arc extinguishing chamber cover 20, and interpolar separator 2
3 is formed so as to surround the arc extinguishing chamber and the main circuit conductive part except for the terminal conductors 3, 14 and the operating rod 24.

One end of each pole operating rod 24 made of an insulating material is connected to a connection adjustment bolt 25 as an opening/closing mechanism of the contactor device.
The end protruding from the opening of the pole separator 23 to the front side is connected to the contact holder 9 via the contact lever shaft 26 and the connector lever 28 equipped with a cross bar 27 connecting each pole through the contact lever shaft 26. It is connected to one end of each of the links 29. The other end of the input link 29 is connected to one end of a trip link 31 via an input roller shaft 30, and the other end of the trip link 31 is connected to one end of a trip lever 33 via a trip link shaft 32. This trip lever 33 is rotatably supported by a trip lever shaft 34. A cutoff spring 36 installed between the shaft 26 and a spring mounting piece 35 provided on the fixed frame 21 is designed to always separate the movable contacts 4 and 5 from the fixed contacts 1 and 2 in the closed circuit state, and It acts to rotate the lever 28 clockwise. Input link 29 and trip link 3
1 form a pair of toggle link mechanisms, and the rotational force of the connector lever 28 acts to bend the closing link 29 and the trip link 31 into a dogleg shape. Throwing roller 3 provided on the link shaft 30
7 and one end of the arm 38a of the closing latch 38 act to hold both the links 29, 31 in the extended closed state. Input latch 3
8 is rotatably supported on a closing shaft 39 and biased clockwise by a closing latch spring (not shown). The trip lever 33 is biased clockwise by a trip lever spring 40, and the other end 33a is releasably engaged with a foot roller 42 provided on the hook 41.
is rotatably supported on a hook shaft 43 and biased counterclockwise by a hook spring 44, and engages with a hook pawl 41a of the hook 41 and a trigger pawl 46 provided on the rotation axis of the trigger lever 45. ing. The force acting on the trip link 31 side due to the clockwise rotational force of the connector lever 28 due to the cutoff spring 36 is reduced and supported by the trigger pawl 46 via the trip lever 33 and the hook 41.
Together with the closing latch 38, the circuit breaker is held closed.

The opening/closing indicator link 47 is connected at one end to the connector lever 28 that moves when opened/closed, and at the other end to the opening/closing indicator 48. The opening/closing indicator 48 has a display portion 48a at one end corresponding to the display window 49a of the front cover 49, and the other end is connected to the opening/closing indicator 48. The end portion is rotatably supported on a release lever shaft 50, and an opening/closing interlock lever 51 and a release lever 5 are coaxially supported.
2 is pivoted. Further, the opening/closing interlock lever 51 is provided with opening/closing interlock interlocking pins 53 protruding from both sides.
A biasing force is applied in a clockwise direction so that one side of the interlocking pin 53 is always pressed against the lower edge of the opening/closing indicator 48, and an opening/closing interlock link 54 is applied to the other side of the interlocking pin 53.
support. An opening/closing interlock pin 55 is attached to the bent portion of the lower end of the opening/closing interlock link 54, and the opening/closing interlock pin 55 is provided to correspond to a closing button 56 provided so as to be operable from the outside of the front cover 49. It is being Further, one end of the input button 56 is rotatably attached to a handle shaft 57.

The input release claw 58 is rotatably supported so as to be able to engage and release one end of the release lever 52, and a input release plate 59 is integrally attached thereto. The other end of the release lever 52 freely engages and releases a holding roller 61 provided on a closing cam 60 that is integrally attached to the closing shaft 39 together with the closing latch 38, and when a closing spring (described later) is energized. One end of the release lever 52 engages with the closing relay release pawl 58, and the other end engages with the holding roller 61 of the closing cam 60, respectively, and in the closing state, the closing roller 37 and closing latch 38 engage with each other.
It is held by engagement with. When the closing spring is not loaded, the closing roller 37 is also supported by the periphery of the closing cam 60 and the closing state is maintained.

The trigger interlocking lever 62 is rotatably integrally attached to the interlocking lever shaft 63, and is provided with a trigger interlocking lever pin 64, which is loosely connected to an elongated hole 66 provided at one end of the trigger link 65. be done. trigger link 6
The other end of 5 is connected to one end of a trigger lever 45. The trigger spring 67 is installed between one end of the trigger link 65 and the mechanism frame 68, and the trigger link spring 69 is installed between the trigger link 65 and the trigger interlocking lever 62. The hook interlocking lever 70 does not operate the opening/closing interface except when the circuit breaker is ready to close.
Push down the lock pin 55 and press the input button 5.
It is rotatably supported on an interlocking lever shaft 63 and loosely connected to a long hole 73 provided at one end of a hook link 72 by a hook link pin 71. The other end of the hook link 72 is connected to the hook 4 by a hook link shaft 74.
1. A closing spring guide shaft is installed between a pair of mechanism frames 68, 68' that support the opening/closing mechanism members with a gap between them, and is inserted through the guide elongated hole 68a of the mechanism frames 68, 68' and protrudes from both sides. 75 and the input crankshaft 77 of the input crank 76, which is integrally pivotally connected to the input shaft 39 that protrudes from both sides of the mechanism frames 68, 68', as shown in FIGS. 16 and 17. A spring 78 is installed. Further, a closing spring guide 79 is provided to pass through the coil of the closing spring 78, and the closing spring guide shaft 75 is slidable within a closing spring guide groove 79a provided on one side of the closing spring guide 79. It's getting old.

In the closed circuit state shown in FIG. 15, when a manual or electrical tripping command is given, the interlocking lever shaft 63 is provided to rotate.
The trigger interlock lever 62 is rotated counterclockwise via the trigger link 65, and the trigger lever 45 connected to the trigger link 65 is rotated clockwise to disengage the trigger pawl 46 and the hook 41, and the hook 41 is rotated clockwise. The state shown in FIG. 18 is that the foot crawler 42 and the trip lever 33 are disengaged, the trip link 31 and the closing link 29 are pulled down, the connector lever 28 is rotated clockwise, and the opening/closing mechanism collapses. Therefore, the movable side contact 4,
5 is in an open state where it is separated from the fixed side contacts 1 and 2. Further, in FIG. 18, the closing spring 78 is in the released state, and the loading roller 37 moves along the outer periphery of the loading cam 60 and is free to be tripped.

Furthermore, when the tripping command is cut off from the tripping state shown in FIG. At this time, the closing crank 76 is rotated counterclockwise by manual or electric operation,
When the closing spring 78 is energized, the closing cam 60 interlocked with the closing spring 78 rotates counterclockwise.
As shown in FIG. 19, the peripheral recessed portion 60a of the trip lever spring 4
0, the input roller 37 falls into the recess 60a of the input cam 60 via the trip lever 33 and the trip link 31, and the trip lever 33 rotates counterclockwise and detaches from the foot roller 42 and the outer peripheral edge on which it slides. 33a. Next, the hook 41 is rotated counterclockwise by the hook spring 44, and the trigger lever 45 is also rotated counterclockwise by the trigger spring 67.
The reset state shown in FIG. 19 is reached. When the closing spring 78 is in the released state in the tripping state shown in FIG. 18, the trip lever 33 and the hook 41 are restrained and cannot be reset.

As shown in FIG. 19, when the closing spring 78 is in the reset state with stored energy, the acting force of the closing spring 78 acts on the closing crankshaft 77 via the closing spring guide 79 to move the closing crank 76 counterclockwise. An acting force is applied to rotate the input crank 76, and the input crank 76 is connected to the input cam 6 via the input shaft 39.
0 and attempts to rotate the input cam 60 counterclockwise. This input cam 60 is equipped with a holding roller 61, and the holding roller 61 is connected to the release lever 5.
2, a counterclockwise acting force is applied to the release lever 52, and this acting force is held by the closing release claw 58.

When closing the circuit breaker from the above-mentioned reset state, when the closing button 56 is pressed, it rotates clockwise about the handle shaft 57 and closes the closing release plate 59 via the opening/closing interlock pin 55.
is pressed, the input release claw 58 rotates counterclockwise, disengages from the release lever 52, the release lever 52 rotates counterclockwise, and the input cam 60 loses support from the holding roller 61. It rotates counterclockwise due to the release action of the closing spring 78, and the outside of the loading cam 60 pushes up the loading roller 37.
By stretching the bends of the input link 29 and the trip link 31, the input link 29 pushes the connector lever 28, and rotates the cross bar 27 counterclockwise.
The operating rod 24 connected to the connector lever 28 of each pole is pushed, the movable contact holder 9 is rotated clockwise, and the movable contacts 4 and 5 are pressed against the fixed contacts 1 and 2. At substantially the final stroke of the injection, the outer periphery of the injection cam 60 becomes substantially arc-shaped around the injection shaft 39, and the injection is completed. During the closing operation, the closing roller 37 pushes the closing latch 38 counterclockwise, but as soon as closing is completed, the closing roller 37 no longer acts, and the closing latch 38 is returned to its original state by a closing latch spring (not shown). Return, one end 3 of the arm of the closing latch 38
8a and the input roller 37 are now facing each other.
The acting force of the closing spring 78 causes the closing crank 76 to
Rotate counterclockwise from the state shown in Figure 6 until the closing crankshaft 77 is approximately 180 degrees centering on the closing shaft 39.
It becomes weakest and stops at the position shown in FIG. 17, which has been rotated by a degree, resulting in the closed circuit state shown in FIG. When the closing spring 78 is loaded in the closing state, the closing cam 60 rotates counterclockwise, the recess 60a of the closing cam 60 faces the closing roller 37, and the closing roller 37 is supported by the closing latch 38. The loaded state is maintained.

20 to 22 show the energy storage mechanism of the closing spring 78, and the energy storage operation of the closing spring 78 is performed by both electric operation and manual operation.

20 to 22, a gear 80 and a charging lever 81 are integrally pivotally connected to the charging shaft 39 between the appearance of the mechanism frame 68' on one side and the charging crank 76. A fixed pawl 82 and a feed pawl 83 are provided to engage with the teeth of the gear 80, respectively. The fixed claw 82 has a screw 98 at one end.
is fixed to the mechanism frame 68', the other end is rotatably supported by a shaft 85 on a fixed pawl support plate 84 supported by the input shaft 39, and biased counterclockwise by a fixed pawl spring 86. The feed claw 83 is connected to the charging lever 81 by a shaft 87.
It is rotatably supported by a shaft and biased counterclockwise by a feed pawl spring 88. One end of the charging lever 81 is loosely connected to a long hole 91 at one end of a charging link 90 by a charging lever pin 89, and a charging lever spring 9 is installed between the charging lever pin 89 and the mechanism frame 68'.
2 has been constructed.

Further, the other end of the charging link 90 is connected to a manual charging handle 93. The manual charging handle 93 is attached to the front cover 49
It is provided so as to be operated from the outside, and is rotatably supported by a handle shaft 57 provided at the lower end. A charging roller 97 is attached to the other end of a motor crank 95, one end of which is fixed to a rotating shaft 94 of the motor so as to correspond to the other end of the charging lever 81, by a crank pin 96.

When the closing spring 78 is in the released state as shown in FIG. 17, the closing cam 60 is in the state shown in FIGS. 15 and 18, and the closing spring storage mechanism in this case is shown in the state shown in FIG. 20. . For manual operation, move the manual charging handle 93 to the front cover 49.
The charging link 90 is pulled by pulling it down to the front side and rotating it counterclockwise, and the charging lever pin 89 engages with the elongated hole 91 to rotate the charging lever 81 counterclockwise. Since the gear 80 is engaged with the feed pawl 83 attached to the pull lever 81, the gear 80 rotates counterclockwise, and the input crank 76 connected to the input shaft 39 rotates together, causing the input spring 78 to rotate. As it is compressed, the closing spring 78 prevents the gear 80 from reversing, and the gear 80 is supported tooth by tooth by the fixed pawl 82. Therefore, when the manual charging handle 93 is rotated to the stop position as shown in FIG.
0 is moved several teeth counterclockwise and held by a fixed claw 82. By returning the manual charging handle 93 and repeating the same operation,
Furthermore, the gear 80 is sent counterclockwise and the closing spring 78
is compressed and stored, and during the operation process, the gear 80 is constantly exerted with a force that tries to rotate clockwise and is supported by the fixed pawl 82, but the closing spring 78 is compressed to the maximum and the closing spring 78 is compressed to the maximum. When the line of action of the spring 78 crosses the line connecting the closing spring guide shaft 75 and the closing shaft 39 to the opposite side, the acting force of the closing spring 78 on the closing crank 76 is reversed and acts counterclockwise to close the fixing pawl. 82 can no longer be supported, and this rotational force is supported by the closing release pawl 58 via the holding roller 61 provided on the closing cam 60 and the release lever 52, resulting in the closing spring stored state as shown in FIG. 16. Retained. In the case of electric operation, a motor crank 95 whose one end is fixed to the rotating shaft 94 of the motor is driven by the motor.
The charging roller 97 rotates via the
Press and rotate as shown in FIG. 21. By pressing and rotating the charging lever 81, a feed pawl 83 attached to the charging lever 81 feeds the gear 80 counterclockwise to one tooth, and the gear 80 is supported by the fixed pawl 82. By repeating this operation, the closing spring 78 is compressed and stored as in the case of manual operation, and immediately after the closing spring 78 is compressed to the maximum and the direction of the force acting on the closing crank 76 is reversed, the feed pawl 83 Approximately two teeth of the corresponding gear 80 are missing, and the charging lever 81 and motor crank 95 are rotated idly, and the gear 80 is no longer fed, and the power of the motor is turned off and the acting force of the closing spring 78 is transferred to the closing cam. 60, the charged state supported by the input release claw 58 is finally maintained.

[Problem that the invention attempts to solve]

However, in the circuit breaker configured as described above, during maintenance and inspection, the circuit breaker main body 10
0 is extracted to the outside from the extraction fixing frame 101 and the closing spring is in the stored state, the closing spring is inserted between the closing spring guide shaft 75 at one end of the closing spring 78 and one end of the closing spring guide groove 79a of the closing spring guide 79. By inserting the release prevention member, giving a closing command, and preventing the release of the stored force of the closing spring 78 by the closing spring release prevention member, the movable contact device is gradually activated by operating the manual charging handle 93. The circuit breaker body 1 was inspected by moving it in the closing direction, but after the inspection, the closing spring release prevention member was still attached.
00 can be inserted into the extraction fixing frame 101 up to the connection position of the main circuit. If a slow close operation was performed at this connection position, there were drawbacks such as damage to the equipment due to arc generation and overheating of the contact portion, which could lead to a fire.

Therefore, the main object of this invention is to provide a circuit breaker which prevents the circuit breaker body from being inserted into the connecting position of the extraction fixing frame while the closing spring release prevention member is attached.

[Means for solving problems]

The slow-close mechanism of the circuit breaker of this invention consists of a shutter lever equipped at one end with a shutter plate provided to open and close the extraction operation hole, and a shutter lever that is rotatable so that one end corresponds to the shutter lever so that it can be freely engaged and released. Pivotally supported shutter plate lock lever
, the closing crankshaft of the closing crank that is integrally attached to the closing shaft, the closing spring guide shaft that slides in the closing spring guide groove provided in the closing spring guide, and the closing crankshaft and closing spring guide shaft. It consists of a closing spring installed in between, a closing spring release prevention member, and a slow operation unit equipped with a shutter plate interlock pin.During maintenance inspection, the shutter plate interlock pin and shutter plate can be removed by installing the slow operation unit. The shutter plate is engaged with the lock lever to prevent the shutter plate that closes the extraction operation hole from becoming unblocked.

[Effect]

In this way, this invention uses the above-mentioned means to
If the slow operation unit is attached, it is not possible to insert the extraction fixing frame into the connection position of the circuit breaker body.

〔Example〕

1 to 6 of the drawings show an embodiment of the slow-closing mechanism of the circuit breaker of this invention, and in the drawings, the same parts as in the conventional device are given the same reference numerals and will be explained.

As shown in FIG. 1, the slow operating unit 200 of the slow-closing mechanism of the circuit breaker of this invention has a shape that is placed over one side of the closing spring guide shaft 75 from the outside when the closing spring 78 is in the charged state. the throw of
An operation unit base 201, a closing spring release prevention member 202 that is fitted into the closing spring guide groove 79a inside the base 201 and inserted between the closing spring guide shaft 75 and one end edge 79b of the closing spring guide 79, and A shutter plate interlock pin 2 is implanted on the unit base frame 201 so as to protrude outward.
03.

Further, as shown in FIGS. 2 and 6, one end of the shutter plate lock lever 204 is rotatable on the shutter plate lock lever shaft 205, which is supported between a pair of support members 115 that are the same as the worm wheel shaft 105. The projection piece 206 is pivoted on the shutter lever 1.
32 and is provided corresponding to the other end of the second arm 132c. The shutter plate lock lever 204 is always operated by the shutter plate lock lever spring 207.
It is biased clockwise and the other bent edge 208 engages with the shutter plate interlock pin 203 when the slow operation unit 200 is installed.

FIG. 3 shows the released state of the closing spring 78 before the slow operation unit 200 is installed, and in this case, the shutter plate lock lever 204 is biased clockwise, and the second shutter lever 132 is
is disengaged from the end of the arm 132c, and the extraction operation hole 1 is released when the positioning lock is released by operating the positioning release lever 127 as in the conventional device.
09 is configured to open a shutter plate 110.

From this state shown in FIG. 3, the closing spring 78 is put into the energized state, the slow operation unit 200 is directed toward the closing spring guide groove 79a, and the closing spring is inserted between the closing spring guide shaft 75 and the end edge 79b of the closing spring guide 79. Attach so that the release prevention member 202 is fitted. When installing this, make sure to remove the shutter plate lock lever.
Since the position occupied by the shutter plate lock lever 204 obstructs mounting, the slow operation unit 200 is mounted by lifting the shutter plate lock lever 204 and rotating it counterclockwise. Therefore, when the slow operation unit 200 is installed, the shutter plate lock lever 204 has one end edge 208 engaged with the shutter plate interlock pin 203 of the slow operation unit 200, and the other end protrusion 206 engages with the second shutter plate lock lever 204 of the shutter lever 132. The state shown in FIG. 4 is reached in which the arm 132c is brought into a corresponding position where it is engaged with the tail end of the arm 132c.

Now, in the state shown in FIG. 4, a closing command is given. That is, the input button 56 is pressed to release the engagement between the input release gourd 58 and the release lever 52, the release lever 52 is rotated counterclockwise, and the holding roller 61 of the input cam 60 is supported. disappears, and the closing spring 78 is released, but the closing spring release prevention member 202 of the slow operation unit 200 prevents the closing spring guide shaft 75 and the end edge 79 of the closing spring guide.
It gets caught between the two and cannot be released any further.

From this state, as shown in FIG. 22, operate the manual charging handle 93 to charge the charging cam 6.
0 in the counterclockwise direction, the outer periphery of the closing cam 60 pushes up the closing roller 37 at a free speed without relying on the force of the closing spring 78, causing the movable contacts 4 and 5 to move into the fixed contacts 1 and 2. The state shown in FIG. 5 is reached, where the circuit is closed toward . Therefore, during maintenance and inspection, it is necessary to operate the manual wheel from the state shown in Fig. 4 to the state shown in Fig. 5.
The closing handle 93 allows slow closing operation from the open position to the closed position at any speed.

In order to insert the circuit breaker main body 100 into the connection position of the extraction fixing frame 101 with this slow operation unit 200 attached, the extraction operation hole 109 is opened by operating the position release lever 127, and the operation handle is inserted into the worm shaft 108. Even if you try to insert it by connecting it to the shutter plate interlock pin 20,
3 engages with one end of the shutter plate lock lever 204, and the projection piece 206 on the other end of the shutter plate lock lever 204 restricts the movement of the shutter lever 132, so that the extraction operation hole 109 of the shutter plate 110 is not unblocked. .

〔effect〕

As mentioned above, the slow speed of the circuit breaker of this invention
In the case of a closed mechanism, the slow speed is
When the close operation unit 200 is installed, the shutter plate 110 that closes the extraction operation hole 109 is restrained in the closed state, and after checking the slow close operation, the slow close operation unit 200 is closed. When the circuit breaker main body 100 is inserted into the connection position to the extraction fixing frame 101 when it is installed, the extraction operation hole 10
9, and the slow closing operation at the connected position of the circuit breaker is prevented. This has the effect of preventing damage to equipment and dangers associated with overheating due to such erroneous operation.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the slow-closing mechanism of the circuit breaker of this invention.
The figure is an exploded perspective view of the main parts when the slow operation unit is installed, Figure 2 is a perspective view of the main parts showing the relationship with the shutter plate when the slow operation unit is installed, and Figure 3 is the slow operation unit. Fig. 4 is a side view showing the release state of the closing spring before it is installed, Figure 4 is a side view showing the closing spring in a state where the closing spring is loaded and the slow operation unit is installed, and Figure 5 is the state shown in Figure 4. Fig. 6 is a side view showing the state of the closing spring when a closing command is given and a slow close operation is performed; Fig. 6 is a side view showing the relationship between the positioning lock release device and the shutter plate lock lever; Fig. 7; Figures 23 to 23 show an example of a conventional device, with Figure 7 being a schematic front view of the circuit breaker main body housed within the extraction fixing frame, Figure 8 being a schematic side view showing the main circuit connection position, and Figure 8 being a schematic side view showing the main circuit connection position. Figure 9 is a partial side view showing the relationship between the worm and the worm wheel, Figure 10 is a partial side sectional view showing the positioning locking mechanism of the circuit breaker body locked in the connected position, and Figure 11. 12 is a side view showing the positioning lock release lever in the locked position, and FIG.
1 is a partial plan view of FIG. 1, FIG. 13 is a partial bottom view of FIG. 11, FIG. 14 is a side view showing the positioning lock release lever in the release position, and FIG. 15 is a closed state of the circuit breaker. Median cross-sectional side view, No. 16
17 is a side view showing the closing spring in the released state, FIG. 18 is a partially sectional side view showing the released state, and FIG. 19 is the reset (open circuit) state. 20 to 22 are side views showing the closing spring energy accumulating mechanism, Fig. 20 is a state in which energy accumulation is started by electric operation, and Fig. 21 is a side view showing a state in which the charging lever is activated by electric operation. - is driven, FIG. 22 is a diagram showing a state in which the charging lever is driven by manual operation, and FIG. 23 is an exploded perspective view of a main part of the closing spring accumulating mechanism. In the figure, 1: fixed main contact, 2: fixed arcing contact, 4: movable main contact, 5: arcing contact, 6: movable main contact rod, 7: movable arcing contact rod,
9: Movable contact holder, 10: Contact spring, 15: Arc extinguishing device, 16: Arc extinguishing grid, 19: Cooling plate, 20: Arc extinguishing chamber cover, 21:
Fixed frame, 22: Mold base, 23: Interpole separator, 24: Operation rod, 27: Cross bar, 28: Connector bar, 29: Closing link,
30: closing latch roller shaft, 31: trip link, 32: trip link shaft, 33: trip lever, 35: spring mounting piece, 36: cutoff spring, 37: closing latch roller, 38: closing latch, 39: closing shaft, 40: Triple lever
Spring, 41: Hook, 42: Foot crawler, 43: Hook shaft, 44: Hook spring,
45: trigger lever, 47: opening/closing indicator link, 48: opening/closing indicator, 49: front cover, 50: release lever shaft, 51: opening/closing interlock lever, 52: release lever,
54: Opening/closing interlock link, 56: Closing button, 57: Handle shaft, 58: Closing release claw, 59: Closing release plate, 60: Closing cam, 61: Holding roller, 62: Trigger Interlocking lever, 65: Trigger link, 67, 69: Trigger spring, 70: Hook interlocking lever, 72:
Hook link, 73: Long hole, 75: Closing spring guide shaft, 76: Closing crank, 78: Closing spring, 7
9: Closing spring guide, 79a: Closing spring guide groove, 80: Gear, 81: Charging lever, 8
2: Fixed claw, 83: Feed claw, 89: Charging lever pin, 90: Charging link, 91:
Long hole, 92: Charging lever spring, 9
3: Charging manual handle, 95: Motor
Crank, 96: Crank pin, 97: Charging roller, 100: Circuit breaker body, 101:
fixed frame, 103: extraction cola, 102: mounting member, 104: extraction rail, 106: worm wheel, 107: worm, 108: worm shaft, 109: extraction operation hole, 110: Shutter board,
111; Extraction lever, 112: Extraction lever low
113: Guide member, 114: Extraction lever guide groove, 115: Support member, 116: Bearing member,
117: Lock cam, 117a, 117b, 11
7c: Positioning groove, 118: Lock lever, 11
8a, 118b: arm, 119: shaft, 120: lock pin, 121: stopper pin, 122, 12
3: Support member, 124: Operation plate, 125: Stopper spring, 126: Lock release lever spring,
127: Positioning lock release lever, 129: Engagement element, 130: Foot lever, 131: Open/close position detection pin, 132: Shutter lever, 134: Connection plate, 200: Slow operation unit, 201: Slow operation unit base Frame, 202: Closing spring release prevention member, 203: Shutter plate interlock pin,
204: Shutter plate lock lever, 205: Shutter plate lock lever shaft, 206: Projection piece, 20
7: Shutter plate lock lever spring.

Claims (1)

[Scope of Claim for Utility Model Registration] Equipped with a closing spring energy storage mechanism in which the circuit breaker body is extracted and inserted into the extraction fixing frame by inserting and operating the operation handle from the extraction operation hole of the front cover. A circuit breaker comprising: a shutter lever having one end thereof a shutter plate provided to open and close a forward extraction operation hole; and a shutter lever rotatable such that one end corresponds to the shutter plate so as to be engaged with and released from the shutter lever. A shutter plate lock lever that is pivotally supported; a closing crankshaft of a closing crank that is integrally attached to the closing shaft; a closing spring guide shaft that slides in a closing spring guide groove provided in a closing spring guide; It consists of a closing spring installed between the crankshaft and the closing spring guide shaft, and a slow operation unit equipped with a closing spring release prevention member and a shutter plate interlock pin. By inserting the closing spring release prevention member between the closing spring guide and the closing spring guide and installing the slow operation unit, the shutter plate interlock pin and the shutter plate lock lever are engaged, thereby closing the extraction operation hole. A slow-closing mechanism for a circuit breaker characterized in that a plate is not unblocked.