JP2506650Y2 - Switch operating mechanism - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an operating mechanism of a switch, and particularly to an operating mechanism in manual operation.

B. Outline of the Invention The present invention is intended to provide an operation mechanism for preventing a malfunction in a switch, and by fixing a cam interlocking with a manual trip button used during manual operation, a manual trip button and a closing hook are provided. An interlock pin that interlocks with the cam is installed between the cam and the closing hook, and a limit switch is provided near the tip of the interlock pin to prevent momentary closing of the main contact due to erroneous operation, and to prevent the closing coil from burning. To prevent.

C. Conventional technology Although various types of switches are used depending on the capacity of the electric circuit, a vacuum circuit breaker (hereinafter referred to as VCB) is a reliable type that can interrupt a large current stably at a high speed. It is a switch having many advantages such as high height, small size and light weight, and has been widely used in recent years.

The main part of the VCB operating mechanism consists of the configuration shown in FIG.
The configuration will be described with reference to FIG. VCB contact 111 is pressure contact spring 109 via insulation lock 110.
The contact pressure during closing is kept constant by the insulating rod 11
0 is connected to the operation shaft 107. A pressure contact spring 109, a breaking spring 114, and rollers 108 and 113 are connected to the operation shaft 107 via levers, and the roller 108 is disposed at a position where it engages a closing cam 106 axially mounted on the cam shaft 105. The urging force of the pressure contact spring 109 connected by the roller 108 and the operation shaft 107 is applied by the cam 106.
The rotation is controlled by.

A roller 113 is arranged at a position where it is formed in a cross shape and engages with a trip hook 112 axially attached to the cam shaft 105, and the biasing force of a blocking spring 114 connected by the roller 113 and the operation shaft 107 is applied to the trip hook 112. It is controlled by the movement. The trick hook 112 is operated by the trip electromagnet 115. A closing spring 101 is fixed to the cam shaft 105 via a lever and a roller 104 is arranged via the lever. The roller 104 is arranged at a position to engage with a closing hook 103 operated by a closing electromagnet 102. There is.

The operation of the VCB operation mechanism configured as described above will be described. FIG. 6 (C) shows a state in which the VCB is open, and the closing spring 101 is in the energy storage state. When a closing command is issued in this state, the closing electromagnet 102 operates, the engagement between the closing hook 103 and the roller 104 is released, and the closing spring 101 is released.

When the closing spring 101 is released, the cam shaft 105 rotates, and the closing cam 106 fixed to the cam shaft 105 moves the roller 108 fixed to the operation shaft 107 via a lever downward. Therefore, the operation shaft 107 rotates. At the same time, the contact 111 of the electrode of the VCB, which is connected to the pressure contact spring 109 and the insulating rod 110 via the lever via the operating shaft, closes to complete the closed circuit.

After the circuit is closed, the trip hook 112 and the roller 113 fixed to the operation shaft 107 engage with each other to maintain the closed state.
The shut-off spring 114 stores energy during the closing operation, and after the operation, the contact pressure of the contact 111 of the electrode of the VCB is held by the pressure contact spring 109. This is the state shown in FIG. 6 (d).

When the closing spring 101 is released, the closing spring 101 is charged again and the VCB shown in FIG. 6 (a) is closed.
When the tripping electromagnet 115 operates in this state, the trip hook 112 and the roller 113 are disengaged from each other, and the operating shaft 107 is rotated clockwise by the blocking spring 114 and the pressure contact spring 109. As a result, the contact 111 of the electrode of the VCB is opened and opened.

FIG. 6 (b) shows the state immediately after the C-O operation, and FIG. 7 shows the electrical internal connection diagram of the VCB.

D. Problems to be Solved by the Invention In the VCB configured as described above, there is no problem in the closing operation corresponding to the closing command from a distance or the closing command manually operated during the continuous opening command. However, although the frequency is low, in the case of an erroneous operation such as when a closing command is erroneously issued during a manual opening operation, the conventional VCB operates as shown in Fig. Was occurring. For this reason, there has been a demand for a countermeasure against a malfunction in which the VCB that should not be closed operates once to the closed position.

The present invention has been made in view of the above problems, and an object thereof is to provide a highly reliable operation mechanism that prevents an instantaneous closing of a main contact of a VCB against an erroneous operation.

E. Means for Solving the Problems The present invention prevents the rotation of the closing hook due to an interlocking pin that engages with the closing hook and the limit switch in the case of an erroneous operation, and a cam interlocking with the manual trip button is fixed. An interlock pin for interlocking the manual trip button and the closing hook is provided between the cam and the closing hook, and a limit switch is provided near the tip of the interlock pin.

F. Action By using the above means, the interlock pin interlocking with the manual trip button engages with the closing hook to prevent the closing hook from rotating, and activates the limit switch to turn off the closing coil.

G. Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 1 to 3 illustrate the operating mechanism of the present embodiment, and the configuration will be described with reference to FIG.

In the configuration of the present embodiment, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description of the members overlapping with the configuration of the conventional technique will be omitted. The closing electromagnet 102 and the trip electromagnet 115 are not shown.

The characteristic feature of the present embodiment is that the input electromagnet 102
The interlock pin 1 that engages with the closing hook 103 that is operated by is provided, the cam 2 that operates the interlock pin 1 is provided in conjunction with the manual trip button 4, and the limit is provided near the tip of the interlock pin 1. The switch 3 is provided.

The above configuration will be described in more detail. The shaft 4a directly connected to the manual trip button 4 is horizontally moved rearward by pressing the manual trip button 4. The cam 2 is fixed to the shaft 4a directly or on a shaft connected to the shaft 4a. The interlock pin 1 is provided so as to be orthogonal to the shaft 4a. One end of the interlock pin 1 comes into contact with the cam 2 by the pressing force of the return spring 5 wound around the pin, and the other end is pressed by the manual tripping button 4 by the cam. Is extended to a position where rotation of the arm portion of the closing hook 103 can be prevented when moving. A limit switch 3 is fixed near the tip of the interlock pin 1 so that when the interlock pin 1 is moved by pressing the manual tripping button 4, the interlock pin 1 engages with the tip of the interlock pin 1 to operate. The limit switch 3 is normally connected to the "ON" state and electrically connected as shown in the internal connection diagram of FIG.

The operation of the present embodiment configured as described above will be described. As shown in Fig. 1, when the VCB is closed and the manual trip button 4 is "OFF", the interlock pin 1
Is in contact with the cam 2 and is pressed in the direction of the shaft 4a directly connected to the manual trip button 4.

When the manual tripping button 4 is pressed to manually open the VCB, the cam 2 rotates, and the interlock pin 1 acts by the cam to move in the arrow direction (to the right in the figure) as shown in FIG.
Go to Then, the front end of the interlock pin 1 passes through the front portion of the arm portion of the closing hook 103, and the tip of the interlock pin 1 reaches the limit switch 3.
Press the contact lever of. At this time, if a closing command is manually issued for some reason, the closing hook 103
Although a force for rotating the closing hook 103 is generated in the clockwise direction, the interlock pin 1 and the arm portion of the closing hook 103 are engaged with each other to prevent the closing hook 103 from rotating. Therefore, even if a manual closing command is issued during the manual opening operation by operating the manual trip button, the VCB is not closed.

Further, as is clear from the internal connection diagram shown in FIG. 4, the limit switch 3 is turned “OFF” by the movement of the interlock pin 1 and the closing coil 52c is electrically protected against the closing command from a remote place. Since the circuit of is closed, the closing electromagnet 102 does not operate and the closing hook 103 is not driven.

Note that FIG. 3 shows the positional relationship between the respective members and the energy storage state of the closing spring 101 in the VCB open circuit state.

H. Effect of the Invention As described above, the present invention has the switch operating mechanism.
A cam that interlocks with the manual button is fixed, an interlock pin that links the manual trip button and the closing hook is placed between the cam and the closing hook, and a limit switch is provided near the tip of the interlock pin. As a result, firstly, the instantaneous closing of the main contact due to an erroneous operation or the like is prevented, and the reliability of protection of the power equipment and the like is improved.

Secondly, the operating mechanism of the present invention does not operate at high speed due to normal electrical opening and closing operations, but operates relatively slowly during manual operation. The reliability does not deteriorate due to factors such as deformation and wear during operation.

Thirdly, the closing command is cut electrically by providing the limit switch in the closing operation circuit, the closing electromagnet is not energized, and the closing coil set at the short-time rating is not burned out. It has a great effect.

[Brief description of drawings]

1 to 3 are views for explaining an operating mechanism of an embodiment of the present invention, FIG. 4 is an electrical internal connection diagram of this embodiment, and FIGS. 5 to 7 are embodiments of the prior art. It is a figure explaining. 1 ... Interlock pin, 2 ... Cam, 3 ... Limit switch, 4 ... Manual trip button, 4a ... Shaft, 5 ... Return spring, 102 ...
Closing electromagnet, 103 ... Closing hook, 104 ... Roller, 106 ... Closing cam, 115 ... Tripping electromagnet.

Claims (1)

(57) [Scope of utility model registration request] 1. A cam shaft for rotating a closing operation operation shaft is fixed, and a cam shaft rotated by a closing spring is engaged with a roller provided on an arm of the cam shaft to prevent rotation of the cam shaft. The closing hook, the closing electromagnet that rotates the closing hook to disengage the roller from the closing hook, the operation shaft that is rotated by the breaking spring during trip, and the roller that is provided on the arm of the operation shaft. A trip hook that blocks the rotation of the operating shaft,
In the operation mechanism of a switch equipped with a trip electromagnet for rotating the trip hook and a manual trip button, a cam is fixed to the shaft of the manual trip button or the shaft connected to the shaft to operate the trip button. An interlock pin that prevents rotation of the hour closing hook in the closing direction is provided between the cam and the closing hook, and the tip of the interlock pin is located near the tip of the interlock pin when the trip button is operated. An operating mechanism for a switch, which is provided with a limit switch for engaging and operating to turn off a circuit of a closing electromagnet.