JPH0626086B2 - Circuit breaker - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to, for example, a drawer type circuit breaker, and in particular,
The present invention relates to an interlock device for a circuit breaker.

[Technical background of the invention and its problems]

In general, this type of drawer-type circuit breaker accommodated in a panel has a structure in which a drawer device is fixed in a switchboard and the breaker is housed in this drawer device in a removable manner.

Further, as the driving means of the drawer, there are (1) one-handed lever driving means and (2) rotary handle type driving means.

This rotary handle type is designed to be operated by converting handle rotary torque into a retracting force of a circuit breaker via a worm gear, a rack and a cam.

In this way, the circuit breaker stored in the switchboard and used when the circuit breaker is closed cannot move from the main circuit disconnection position to the connection position or to the connection position. An interlock device is provided so that the circuit cannot be mechanically closed except at the positions (connection position, disconnection position, and test position).

The interlock device in the conventional circuit breaker is the first
It is constructed as shown in FIGS. 0 to 12.

That is, in FIG. 10 to FIG. 12, a pair of guide rails c are juxtaposed on both inner side walls of a case body b having an opening / closing door a in the drawer device I, and a bottom plate of the case body b. b1 has an operating screw rod d having a handle d1.
Are provided in the length direction of the guide rail c.
A main circuit conductor e is attached to the back plate b2 of the case body b, and an engaging groove f is formed in a part of the lock plate g adjacent to the guide rail c. On the inner side wall of the case body b located immediately above the engagement groove f,
A cam plate h is attached.

On the other hand, a pair of rollers j attached to a casing i of the circuit breaker II are rotatably provided on the guide rail c of the case body b, and a bottom plate k of the casing i is The rack 1 is provided so as to mesh with the operation screw rod d. Further, a guide pin m is attached to one side of the casing i so as to abut the cam plate h, and another locking pin n is attached to the guide pin m by a link mechanism (not shown). It is detachably provided in the engaging groove f of the lock plate g through the lifter.

Therefore, when the case i of the circuit breaker II is pulled outward from the case body b of the drawer I, the interlock device in the circuit breaker described above preliminarily releases the locking pin n from the engagement groove f. After removing it via a lifter that interlocks with the guide pin m of the cam plate h, the handle d1 is rotated to rotate a screw rod d integral with the handle d1, and a circuit breaker integral with the rack l meshed with the screw rod d. The housing i of II is pulled out toward the front along the guide rail c, so that the disconnecting portion of the circuit breaker II is separated from the main circuit conductor e.

However, since the interlock device in the circuit breaker described above is attached beside the roller c,
Not only does the lifter interfere with the link mechanism,
The structure is complicated and the number of components is large. Moreover, assembly and adjustment are troublesome, and maintenance and inspection are difficult.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and simplifies the configuration of the interlock device to facilitate assembly / adjustment and maintenance / inspection, and to improve safety and reliability. It is intended to provide a circuit breaker for the purpose.

[Outline of Invention]

According to the present invention, a position detecting member is provided on a bottom plate of a case body of a drawer, a casing of a circuit breaker is detachably provided in the case body, and a pair of holding frames also serving as guides are provided on the front of the casing. A shutter having a handle insertion opening between the both holding frames is provided so as to be able to move up and down by urging it downward, and a closing coil and a trip coil are provided close to each other in the housing inside the shutter. A closing operation rod having a closing push button is provided on the shafts of the respective operating rods of both coils so as to push the closing paddle integrated with the closing shaft, and the closing rod of the casing located above the position detection member is provided. A trip push button having a trip push button is provided on the bracket so as to project outward, and a trip paddle integral with the trip shaft is provided in the casing near the trip push casing to open the circuit breaker. It is provided to hold the The interlock pin in the housing on the pivot path of Ppupadoru provided to lift above position detecting member, a flange on an upper portion of the interlock pin in which annexed to lock the trip paddle.

Example of Invention

 The present invention will be described below with reference to an embodiment shown in the drawings.

1 to 8, reference numeral I is a drawer, and a box-shaped case main body 1 in the drawer I
As shown in FIG. 1, a pair of upper and lower guide rails 2 are juxtaposed on both inner sidewalls 1a of the case 1, and the bottom plate 1b of the case body 1 is arranged in the middle of FIG. As shown in FIG. 3, a trapezoidal position detecting member 3 is attached. Further, as shown in FIG. 3, a main circuit conductor 4 is attached to the back plate 1c of the case body 1, and the main circuit conductor 4 is attached to the back of a casing 5 in a circuit breaker II described later. The main circuit disconnecting section 7 provided on the plate 5a is anastomosed and connected.

On the other hand, on the guide rail 2 of the case body 1, a pair of rollers 6 provided on both side walls of the casing 5 of the circuit breaker II are rotatably provided. A pair of holding frames 8 that also serve as guides are erected on the front surface of the. A shutter 9 having a handle insertion opening 9a and a knob 9b is provided between the two holding frames 8 and has a coil spring 1.
The shutter 9 is urged downward by an elastic force of 0 so as to be able to move up and down, and the shutter 9 is regulated in its lifting range along a slit 9c formed in the middle of the shutter 9 (see FIG. 1). reference). Further, a block body 11 is rotatably mounted on the both holding frames 8 in the casing 5 of the shutter 9 by a support shaft 11a integral with the block body 11. The block 11 has a drive rod 12
Is rotatably screwed. Furthermore, the front end portion 12a of the drive screw rod 12 is formed so that the operation handle 13 can be fitted therein and can rotate, and the screw shaft 12b at the rear end portion of the drive screw rod 12 has the pin shaft 14 attached thereto. It is screwed (see FIG. 2). A pair of operating rods 15 are loosely mounted on both ends of the pin shaft 14.
As shown in FIGS. 1 and 2, a connecting rod 16 is axially attached to one end of the connecting rod 16. Further, at both ends of the connecting rod 16, each arm rod 18 having each pulley (roller) 17 is provided.
Is provided as shown in FIG. 1, and each of the pulleys 17 is adapted to engage with the cut groove 2a of the guide rail 2 shown in FIG. Therefore, by inserting the operation handle 13 into the front end portion 12a of the drive screw rod 12,
When this is rotated, the pin shaft 14 screwed into the drive screw rod 12 is advanced, so that the operating rod 15 that holds this pin shaft 14 rotates around the connecting rod 16 and the connecting rod 16 is rotated.
The both arm rods 18 are rotated, and the pulleys 17 of the both arm rods 18 are fitted into the cut grooves 2a of the guide rails. On the other hand, when the pulleys 17 are separated from the cut groove 2a, the operation handle 13 is rotated around the support shaft 11a to move the casing 5 of the circuit breaker II to the case of the drawer I. It can be inserted into and removed from the main body 1.

On the other hand, in the casing 5 in the middle of the shutter 9,
The closing coil 19 and the trip coil 20 of the circuit breaker II are provided close to each other, and the closing operating rod having the closing push button 21a is provided on the operating rod (output shaft) of the closing coil 19 and the trip coil 20. A pair of brackets 22a and 22b urges 21 to be slidably biased so as to project inward. Also, the above-mentioned closing operation rod 21
At the inner end portion 21b of the above, a closing paddle 24 which is integral with the closing shaft 23 is extended, and the closing paddle 24 is elastically pressed against the inner end portion 21b.

Therefore, when the closing coil 19 is energized during the electric operation, the closing coil 19 pushes the closing operating rod 21 inward, and the closing paddle 24 is pushed by the inner end portion 21b of the closing operating rod 21. Then, the closing shaft 23 is rotated, whereby the breaker II is closed. On the other hand, when the trip coil 20 is energized, the trip coil 20 attracts the closing actuating rod 21 to the outside, thereby tripping the circuit breaker II. Further, when the closing operation rod 21 is manually operated, by pushing the closing push button 21a with a fingertip,
The closing paddle 24 is pushed to rotate the closing shaft 23, thereby closing the circuit breaker II.

A lock pin 25 is attached to the closing operation rod 21 positioned orthogonally to the vicinity of the shutter 9.
As shown in FIG. 1, the lock pin 25 cannot push the closing actuating rod 21 manually unless the shutter 9 is lifted and the engagement of the shutter 9 is released. Has become.

On the other hand, on the one side edge of the shutter 9 and on the housing 5 directly above the position detecting member 3, the bracket 2 is provided.
6 is provided on the bracket 26. A trip push rod 27 having a trip push button 27a is urged so as to project outward. A trip paddle 29, which is integral with the trip shaft 28 mounted on the casing 5, is provided at the inner end of the trip push rod 27. The housing 5
Includes a flange 30 of an interlock pin 30 described later.
a is provided. That is, a mounting bracket 31 is attached to a part of the housing 5, and the mounting bracket 31
The interlock pin 30 is vertically slidably fitted on the lower end portion 30b of the interlock pin 30 as shown in FIGS. 2 and 3. You can move up.

The interlock pin 30 is locked to a part of the mounting bracket 31 by a stopper 32 attached to the interlock pin 30 so that the lowering limit is restricted. An operation panel 33 is attached to the housing 5 in front of the shutter 9, and the closing push button 21a and the trip push button 27a are exposed from the operation panel 33.

The operation of the present invention will be described below.

1. Disconnection Position FIG. 3 shows the disconnection position when the circuit breaker II is housed in the drawer device I. In this state, the main circuit disconnecting section 7 of the circuit breaker II is completely separated from the main circuit conductor 4 of the drawing device I, and at the same time, the control circuit disconnecting section 7a attached to the circuit breaker II and the drawing circuit are connected. The control circuit conductor 4a of the device I is also open. The circuit breaker II is inserted into the case body 1 from this disconnection position (see FIG. 3).

When inserting the circuit breaker II, the trip push button 27a shown in FIGS. 1 and 2 is pressed to release the engagement of the recess of the shutter 9, and then the knob 9b of the shutter 9 is pinched, Push this up. Then, as shown in FIG. 4, the front end portion 12a of the drive screw 12 is exposed through the handle insertion opening 9a of the shutter 9, and the operation handle 13 is inserted into the front end portion 12a.
In this way, the trip push button 27a moves the circuit breaker II while the trip push button 27a is still pushed, and thus the trip push rod 27 pushes the trip paddle 29. Then, the trip shaft 28, which is integrated with the trip paddle 29, rotates right as shown by the chain line in FIG. As a result, the trip shaft 28 holds the circuit breaker II in the open state via the operation mechanism linked to the trip shaft 28.

Here, even if the closing spring for closing the circuit breaker II is in the stored state, even if the closing push button 21a is pressed to release the tripping spring 28,
If the trip push button 27a is not restored, the trip push button 27a is blocked. Further, in the present invention, the double interlock for preventing the idle driving locks the lock pin 25 of the closing push button 21a by a part of the shutter 9 so that the closing push button 21a cannot be pushed, and the operator's Improves safety. On the other hand, when the operation handle 13 inserted into the drive screw rod 12 is removed at this time, the shutter 9 returns to the state shown in FIGS. The II can open and close normally.

2. Test Position Next, in FIG. 5, when the inserted operation handle 13 is rotated together with the driving screw rod 12, the pin shaft 1 that is screwed into this is rotated.
4, the connecting rod 16 is rotated clockwise via the operating rod 15. Then, the pulleys 17 attached to the arm rods 18 of the connecting rod 16 engage with the cut grooves 2 a of the guide rail 2.
As a result, the casing 5 of the circuit breaker II moves into the case body 1 of the drawer device I. As a result, as shown in FIG. 5, the connection between the control disconnecting section 7a of the circuit breaker II and the control circuit conductor 4a of the drawing device I is completed and the test position is reached.
In this state, unless the operation handle 13 is pulled out, the trip-free state is mechanically set as described above.

3. Interlock Next, in FIG. 6, when the inserted operation handle 13 is further rotated together with the drive screw 12, the circuit breaker II moves into the drawer device I. At this time, the lower end portion 30b of the interlock pin 30 rides on the top of the position detection member 3 of the drawer device I. As a result, the interlock pin 30 is launched upward, so that the flange 30a of the interlock pin 30 locks the trip paddle 29 pushed by the trip push button 27a. As a result, the control circuit disconnecting section 7a of the circuit breaker II and the control circuit conductor 4a of the drawing device I are in a connected state. Further, in this state, the main circuit disconnecting section 7 of the circuit breaker II is separated from the main circuit conductor 4 of the drawing device I, and the circuit breaker II is in a dangerous state. At this time, the circuit breaker II is not closed unless the operation handle 13 is pulled out.

However, the test position of the breaker II shown in Fig. 5
When the operation handle 13 is pulled out between the disconnection positions, the circuit breaker II can be closed, but in the present invention, even when the circuit breaker II is not in the main circuit connecting position, the circuit breaker II is opened. It doesn't work.

That is, suppose now that the operation handle 13 is in the incomplete position.
Is pulled out, the shutter 9 is lowered downward by the elasticity of the coil spring 10 to return to the original position, and at the same time, the trip push button 27a is returned by its own habit, but the flange 30a of the interlock pin 30 has already been returned. The trip paddle 29 locked by the lock cannot be returned to its original state, and is not closed electrically or mechanically.

4. Connection Position Next, in FIG. 7, when the inserted operation handle 13 is rotated together with the drive screw 12 to the end of the cut groove 2a, the control circuit disconnecting portion 7a of the circuit breaker II and the control circuit conductor 4a of the drawing device I are connected. Connection and main circuit disconnection section 7 and main circuit conductor 4
And to be fully connected. At the same time, as shown in FIG. 7, the interlock pin 30 has passed over the position detection member 3, so that even if the operation handle 3 is pulled out, the circuit breaker II functions normally and the The opening and closing operation can be performed both mechanically and mechanically.

Next, in FIG. 8, when the circuit breaker II is pulled out from the drawer device I and installed on the floor surface for maintenance and inspection, the operation handle 13 is pulled out from the drive screw rod 12, so the shutter 9, The trip push button 27a has returned to normal. At this time, although the interlock pin 30 is pushed upward on the floor surface, the trip paddle 29 has already been restored by the return movement of the trip push button 27a, so that the flange 30a of the interlock pin 30 is tripped. Without pushing up the paddle 29, launch it to a position where it does not interfere with the rotation of the trip paddle 29. Thus, by connecting the test power supply to the control circuit, it is possible to open and close electrically and mechanically.

Next, another embodiment of the present invention shown in FIG. 9 has a detection switch s attached to the hoistway of the flange 30a of the interlock pin 30.
May detect the opening / closing operation of the electric signal and electrically lock the circuit breaker II at an incomplete position (between the operating position and the test position) with respect to the drawing device I to completely cut off the excitation of the closing coil 19. it can. In addition, the closing operation of the circuit breaker II, like the lock pin 25 of the closing push button 21a, prevents the closing spring of the closing mechanism of the operating mechanism (not shown) from being released and prevents the above-mentioned operating mechanism from being idled. In order to prevent this, the indicator switch of the switchboard is turned on by using the detection switch s.

〔The invention's effect〕

As described above, according to the present invention, the position detecting member is provided on the bottom plate of the case body of the drawer, and the casing of the circuit breaker is detachably provided in the case body, and the guide is provided in front of the casing. A pair of holding frames, which also serve as a pair, are provided upright, and a shutter having a handle insertion opening is provided between the both holding frames so as to be able to move up and down by urging the shutter downward, and a closing coil and a trip coil are provided inside the shutter. Are provided close to each other, and a closing operation rod having a closing push button is provided on the shafts of the respective operating rods of these coils by urging so as to push the closing paddle integrated with the closing shaft.
A trip push button having a trip push button is provided on the bracket of the casing located above the position detecting member so as to project outward, and is integrated with the trip shaft in the casing near the trip pushing rod. The trip paddle is provided so as to maintain the circuit breaker in the open state, and the interlock pin is provided on the casing on the rotation path of the trip paddle so as to be moved up and down by the position detecting member. Since a flange is attached to the upper part of the so as to lock the trip paddle, not only the interlock operation can be secured but also the safety can be improved, and the structure is simple. -Adjustment becomes easy and labor can be saved by mass production.

[Brief description of drawings]

FIG. 1 is a front view showing only a main part of a circuit breaker of the present invention, FIG. 2 is an enlarged side view of the same as above, FIG. 3 is a side view showing a disconnection position of the present invention, and FIG. Same as the front view, FIGS. 5 to 8 are views for explaining the operation of the present invention, and FIG.
FIG. 10 is a view showing another embodiment of the present invention, FIG. 10 to FIG.
FIG. 2 is a diagram for explaining a conventional circuit breaker. I ... drawing device, II ... breaker, 1 ... case body, 3
...... Position detection member, 5 …… Case, 8 …… Holding frame, 9 ……
Shutter, 28 ... Trip shaft, 29 ... Trip paddle, 30 ... Interlock pin, 30a ... Flange.

Claims (1)

[Claims] 1. A position detecting member provided on a bottom plate of a case main body of a drawer, a casing of a circuit breaker which is removably provided in the case main body, and which is provided upright in front of the casing. A pair of holding frames that also serve as guides, a shutter having a handle insertion opening that is urged downward between the two holding frames so as to be able to move up and down, and provided inside the shutter close to the housing. A closing coil and a trip coil, and a closing rod having a closing push button urged to push the closing paddle integrated with the closing shaft on the shafts of the operating rods of the coils. A trip push rod having a trip push button urged outward to a bracket of the casing located above the position detection member, and the cutoff in the casing near the trip push rod. The device is installed to maintain the open condition. The trip paddle integrated with the trip shaft, the interlock pin provided on the casing on the rotation path of the trip paddle so as to move up and down by the position detecting member, and the trip paddle above the interlock pin. A circuit breaker, comprising: a flange attached so as to be locked.