JP2527759Y2 - Interlock device for draw-out circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an interlock device for a drawer-type circuit breaker.

[Conventional technology]

FIG. 5 shows a drawer-type circuit breaker 100 housed in a control panel.
The upper part accommodates a circuit breaker body 101 such as a vacuum circuit breaker, and the lower part accommodates an operation mechanism and an operation circuit for driving the circuit breaker body 101. An electric conductor 3 connected through a flexible conductor and an electric conductor 4 connected to a fixed electrode extend to the outside through the back wall 1B of the box 1. Fingers 3A and 4A are attached to the tips of the electric conductors 3 and 4, respectively.

This type of drawer-type circuit breaker 100 is housed in a control panel 200 as shown in FIG. 6, and when it is moved to a predetermined position (operating position) in the control panel 200, the fingers 3A and 4A are moved to the control panel 200.
The operating mechanism is automatically connected to the connection terminals 5 and 6 of the main circuit extending in 0, respectively, and when a closing command is given to the operating circuit or the manual operating lever 7 is operated to the closing side. Then, the space between the two electrodes of the circuit breaker body is closed, and the space between the connection terminals 5 and 6 is closed. 8 is a manual trip lever, and 9 is a handle.

The drawer-type circuit breaker 100 is used by connecting the operation circuit to the operation circuit power supply, but forgets to insert the operation circuit power plug 70 into the receptacle 60 provided on the box 1, that is, the operation circuit If the user forgets to connect to the operation power supply and stores it in a predetermined position in the control panel 200 and turns on the manual operation lever 7 in this state, even if an abnormality occurs in the main circuit,
Since the operation circuit has no power supply, it does not operate and the tripping operation of the circuit breaker is not performed, which may cause an accident.

Therefore, as long as the power plug for the operation circuit is not connected, it is legally required to provide an interlock device so that the operation mechanism does not operate even if the manual operation lever 7 is operated.

As this kind of interlock device, Jpn.
There is one described in JP-A-8.

The interlock device disclosed herein includes an interlock plate which, when the power plug is inserted into the receptacle, is displaced against the elasticity of a spring in response to the insertion operation, and a claw for releasing the displacement of the interlock plate. In the state where the power plug is not inserted into the receptacle, the engaging operation of the operating mechanism is released by disengaging the pawl of the link mechanism for vertically moving the operating lever and the releasing pawl. When the power plug 70 is disabled and the power plug 70 is inserted into the receptacle, the tripping pawl is engaged with the pawl of the link mechanism to enable the operation of the operating mechanism.

[Problems to be solved by the invention]

In this conventional interlock device, the tripping claw, which is an important member in the operation mechanism, is used as a part of the device. Therefore, if a failure occurs in the interlock device, the tripping function of the circuit breaker does not function. In addition, there is a danger that it will not operate, and it is not possible to prevent the power plug from being accidentally pulled out of the receptacle during the operation of the circuit breaker, and there is still a problem of lack of safety and reliability.

The present invention has been made to solve the above problems.
The interlock function can be obtained without using the components of the operating mechanism, the circuit breaker can be moved to the operating position when the power plug is inserted, and the power plug is accidentally pulled out of the receptacle during operation. It is an object of the present invention to provide an interlock device for a drawer-type circuit breaker that can prevent the occurrence of a breaker and greatly improve safety and reliability as compared with the related art.

[Means for solving the problem]

In order to achieve the above object, the present invention has a main body frame 20 having a receptacle 60 attached to the front surface and fixed to a drawer-type circuit breaker.
A movable body 31 whose front end 35 is guided by the main body frame 20 and can move backward against the spring 27, and whose front end 35 extends near the front surface of the receptacle 60;
The other end is pivotally supported by the main body frame 20 which is a plug lock portion 40C which is a plug lock portion 40C which can be turned forward on the front side from the operating circuit power supply rug 70 in the receptacle inserted state. A first interlock member 40 composed of a moving lever, and one end of the first interlock member 40 connected to the movable body 31 so as to be displaceable by a predetermined amount, and the other end of the first interlock member facing the outside of the control panel that houses the drawer-type breaker. A second interlock member 50, which is a circuit breaker lock portion that can be swung around on the front side and is composed of a rotating lever supported by a support plate 24 integral with the main body frame 20; When the circuit power plug 70 is inserted, it is driven backward by the power plug 70,
When the power plug 70 is not inserted, the first interlock member 40 is released from the wraparound, and when the power plug 70 is inserted,
The second interlock member 50 is configured to release the wraparound.

[Action]

In the present invention, the circuit breaker lock portion of the second interlock member 50 is wrapped forward of the stopper surface of the control panel in a state where the power plug 70 is not inserted into the receptacle 60. Can not be moved. When the power plug 70 is inserted into the receptacle 60, the movable body 31 retreats, so that the first interlock member 40 rotates by a predetermined angle, and the plug lock portion 40C moves to the front side of the power plug 70. As the power plug 70 cannot be pulled out and cannot be removed, the second interlock member 50 rotates by a predetermined angle and the circuit breaker lock portion is released from turning forward of the stopper surface, so that the circuit breaker is controlled. It is possible to move the operation position in the panel.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

1 to 3, reference numeral 20 denotes an L-shaped main body frame in side view, in which a notch window 22 is formed in a vertical plate portion 21, and an upper portion 21A of the notch window 22 has an upper edge. A guide hole (vertical slit) 24 that opens is formed, and two guide grooves 23 are formed at the lower edge of the cutout window 22. This upper part
Two support plates 25 projecting rearward in parallel from both sides of the guide hole 24 are attached to the back surface of the guide hole 24A. A support block 29 having a spring tube portion 28 containing a spring 27 is provided upright on the rear end of the horizontal plate portion 26 of the main body frame 20.
A support plate 30 is provided upright at a position slightly behind the vertical plate portion 21 of 26.

Numeral 31 denotes a movable member which is a longitudinal member, and includes a plate-shaped portion 32 and a spring receiving recess 33 extending rearward from the rear end of the plate-shaped portion 32.
A has a shaft portion 33 having an A, and the plate-shaped portion 32 has a front end 3
The frame up to 5 is a frame-shaped portion having a side frame 34, and the front end 35 is a fork-shaped portion having a concave portion 36 opened at the front end. In the movable body 31, the shaft 33 is inserted into the spring cylinder 28 through the guide hole 29A of the support block 29, the front end 35 is inserted into the guide groove 23 of the main body frame 20, and the spring 27 moves toward the support plate 30 side. It is urged and supported by the support plate 30 and the support block 29, and the front edge of the side frame 34 is pressed against the rear surface of the guide plate 30. A slit-shaped guide hole 37 extending rearward from a position close to the front end 35 is formed in the plate-shaped portion 32 of the movable body 31, and a circular end is formed at the rear end of the side frame 34 as shown in FIG. An arcuate guide hole 38 is formed.

Reference numeral 40 denotes a first interlock member formed of a rotating lever. The lower end portion of the lever portion 40A is inserted into the slit-shaped guide hole 37 and connected to the side frame 34 of the plate-shaped portion 32 by the guide shaft 39.
From the upper end of the lever portion 40A, through the guide hole 24 of the main body frame 20, to the front of the vertical plate portion 21 and extend from the lever portion 40B which is a plug lock 40C having a downwardly bent L-shape. The bent portion is rotatably fixed to the support plate 25 by a pin 41. A guide hole 42 through which the guide shaft 39 is inserted is formed at the lower end of the first interlock member 40.

Reference numeral 50 denotes a second interlock member including a rotating lever, which has an upward protrusion 51 on one end (rear end) side and a circuit breaker lock portion 52 bent downward on the other end side, A rotation shaft 53 is rotatably supported by a support member 54 extending from the support plate 30. The protrusion 51 has a guide shaft 55, which is inserted into the arc-shaped guide hole 38 of the side frame 34 and supported by the movable body 31. The second interlock member 50 has the circuit breaker lock portion 52 side extending forward from the vertical plate portion 21.

The receptacle 60 into which the power plug 70 for the operation circuit is inserted is fixed to the cutout window 22 via the mounting plate 61. The power plug 70 is one size larger than the receptacle 60, and the lower part 70A projects from the lower surface of the receptacle 60 when the power plug 70 is inserted into the receptacle 60.

This interlock device is fixed via a base 80 to the bottom of a receptacle housing portion 102 formed on the front panel 1A of the case 1 of the drawer-type circuit breaker 100.

201 is a stopper provided on the control panel 200, for example, a control panel.
It is the front wall of 200 bottom frames.

FIGS. 1 and 2 show the attitude when the drawer-type circuit breaker 100 is at the test position. The lever part 40A of the first interlock member 40 is in a vertical attitude, and the lever part 40B is obliquely upward. , The upper end of the guide hole 42 engages with the guide shaft 39, and the lower end of the plug lock portion 40C of the lever portion 40B is located above the receptacle 60. Further, the second interlock member 50 is in a posture facing horizontally, the guide shaft 55 is engaged with the upper end of the arc-shaped guide hole 38 of the side frame 34, and the breaker lock portion 52 is It is lowered to the front surface of the stopper portion 201 of 200.

Therefore, in this position, the power plug 70 can be inserted into the receptacle 60 below the plug lock portion 40C of the first interlock member 40, but the breaker lock portion
The drawer-type breaker 100 cannot be moved to the operation position in the control panel 200 because the 52 is hooked on the stopper 201 of the control panel 200. That is, the drawer-type circuit breaker 100 is interlocked with the control panel 200.

When the power plug 70 is inserted into the receptacle 60, the lower part of the power plug 70 pushes the front end of the front end 35 of the movable body 31 in the direction of the arrow in the drawing, so that the movable body 31 retreats against the elasticity of the spring 27. . When the movable body 31 retreats, the lever portion 40B of the first interlock member 40 starts rotating upward and to the right,
The guide shaft 55 of the interlock member 50 is guided by the guide hole 38 of the side frame 34, descends in an arc, and the circuit breaker stopper 52 of the second interlock member 50 also starts to rotate to the upper right, When the power plug 70 is completely inserted into the receptacle 60 as shown by a chain line in FIG. 1, the first interlock member 40 assumes an inclined posture shown by a chain line in FIG. Plug stopper 40C is the power plug 7
Go down to the front of 0. In addition, the second interlock member 50
Is in an inclined position shown by a chain line in FIG. 1, and the breaker lock portion 52 is raised above the stopper portion of the control panel 200.

Therefore, the power plug 70 is connected to the first interlock member 40.
The plug lock section 40C of the power supply block 70 is in the way and cannot be removed from the receptacle 60, the power plug 70 is interlocked, and the interlock by the circuit breaker lock section 52 is released. It can be moved to a predetermined position in 200 and connected to the main circuit.

As described above, in this embodiment, unless the power plug 70 is inserted, the circuit breaker 100 is locked from moving to its operating position. Therefore, even if the manual operation lever 7 is operated, the operation mechanism is turned on. And the circuit breaker 100 is not operated even though the operation circuit is not connected to the operation power supply.

If the power plug 70 inserted into the receptacle 60 does not pull out the circuit breaker 100 to the test position,
Since it cannot be pulled out from 0, the power plug 70 does not come off for any reason during the circuit breaker operation.

Further, in the present embodiment, since a part of the control panel 100 is used, unlike the case where a part of the conventional operation mechanism is used,
Even if an abnormality occurs in the interlock device, the tripping function of the operation mechanism is not lost.

In addition, since this embodiment is a device independent of the circuit breaker operating mechanism, there is an advantage that it can be easily attached to an existing circuit breaker.

[Effect of the invention]

As described above, the present invention is an interlock device independent of the circuit breaker operating mechanism, so that even if an abnormality occurs, it does not affect the operation of the circuit breaker operating mechanism. The movement of the breaker to the operating position is locked, and the power plug cannot be removed unless the circuit breaker is pulled out, so that the safety and reliability can be greatly improved compared to the past, and . The above effects can be obtained with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a plan view with a part of the above embodiment removed, FIG. 3 is a front view with a part of the above embodiment removed, and FIG. FIG. 5 is a front view of a drawer-type circuit breaker, and FIG. 6 is a side view of the drawer-type circuit breaker. 20 body frame, 27 spring, 31 movable body, 40 first
Interlock member, 40C …… Brag lock part, 50…
... 2 interlock members, 52 ... breaker lock section, 60
... receptacle, 70 ... power plug, 100 ... draw-out circuit breaker, 200 ... control panel, 201 ... stopper part.

Claims (1)

(57) [Scope of request for utility model registration] 1. A main body frame 20 having a receptacle 60 attached to a front surface thereof and fixed to a drawer-type circuit breaker;
Guided by 20, it can move backward against the spring 27,
A movable body 31 whose front end 35 side extends in the vicinity of the front surface of the receptacle 60, and one end of which is displaceably connected to the movable body 31 by a predetermined amount, and the other end of which is provided by a power supply rug 70 for an operation circuit in a state where the receptacle is inserted. A first interlock member 40, which is a plug lock portion 40C that can be turned forward and is composed of a rotating lever pivotally supported by the main body frame 20, and one end of the first interlock member is displaceably connected to the movable body 31 by a predetermined amount. The other end is a circuit breaker lock portion that is capable of swiveling forward on a surface facing the outside of the control panel that houses the drawer-type circuit breaker. The circuit breaker is pivotally supported by a support plate 24 integrated with the main body frame 20. A second interlock member 50 comprising a moving lever, wherein the movable body 31 is driven rearward by the power plug 70 when the operation circuit power plug 70 is inserted, and
When the power plug 70 is not inserted, the first interlock member 40 is released from the wraparound, and when the power plug 70 is inserted,
The interlock device for a drawer-type circuit breaker, wherein the second interlock member 50 is released from the wraparound.