JPS6231951Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a latch mechanism that mechanically maintains a closed state and a disconnected state in a vacuum switch, and is an improved structure thereof.

In other words, the present invention simplifies the structure of the latch mechanism, reduces the number of parts, and facilitates maintenance and adjustment.
Furthermore, the purpose is to alleviate the unreasonable mechanical force applied to the operating shaft.

Generally, some vacuum interrupters use an operating electromagnet to input the vacuum interrupter.

A vacuum interrupter that turns on a vacuum interrupter using an operating electromagnet has a configuration as shown in FIGS. 6 and 7, for example. That is, a vacuum interrupter 102 is suspended and fixed to the top wall 8f of the frame in a housing-like frame 8 made entirely of molded insulators, and a movable iron core 2 and a movable iron core 2 are attached so that the vacuum interrupter 102 can be turned on. An operating electromagnet 14 capable of attracting is provided. The operating shaft 3 of the movable iron core 2 has both end portions in a cylindrical shape and is rotatably supported by bearings 18 on both side walls 8g of the frame 8, and the operating lever 108 that moves the movable lead rod 107 up and down is referred to as the movable iron core 2. It is installed in one piece at a right angle. The movable iron core 2 is pressed by a break spring 110 wound around a spring holder 109 protruding from the back wall 8a of the frame 8, and the operating electromagnet 14
It is always energized in the direction away from. A stopper 111 that restricts the movement of the movable core 2 in the biasing direction is fixed and protrudes from the lower base 8b of the frame. The operating electromagnet 14 consists of a pair of electromagnets 14, 14 arranged in parallel facing the movable core 2, and a magnetic pole plate 114 is fixed to one end side of the fixed core 112 (on the movable core 2 side) with a bolt 113. . On the other hand, the other end of the fixed core 112 is connected to a bolt 115.
is fixed to the inner wall of the frame rear wall 8a. Note that 116 is a fixed terminal of the vacuum interrupter 102, 117 is a movable terminal, and 118 is an insulating plate.

The closing and disconnection of the vacuum shield and disconnector are performed by rotating the movable iron core 2, which is integrated with the operating lever 108, around the operating shaft 3 through the action of the operating electromagnet 14 and the shear breaking spring 110. .

The latch mechanism of a conventional vacuum switch has a structure shown in FIGS. 1 and 2. To explain this with reference to the diagram, 1 is an operating electromagnet, and one end of the operating shaft 3 to which the movable core 2 is fixed (the left end in FIG. 1) is
The upper end of the dogleg-shaped roller arm 4 is attached with a fixing bolt 5. An engagement roller 6 is rotatably attached to the yoke at the lower end of the roller arm 4, and a trip hook 7 that engages with the engagement roller 6 is rotatable about a shaft 9 fixed to a side frame 8 of the vacuum switch. It is installed in

As shown in FIG. 2, the tripping hook 7 has a protrusion 7a extending diagonally upward to the right from the shaft 9, and its tip end surface engages with the engagement roller 6.
It is formed into a circular arc surface centered on the axis 9. Then, one end 10a of the torsion coil spring 10 installed around the shaft 9 is locked to a pin 11 fixed to the side frame 8, and the other end 10b is pulled out and locked to the protrusion 7a of the hook 7. , Tripping hook 7
is constantly biased with rotational moment in the direction of engagement with the engagement roller 6.

The normal engagement position of the removal hook 7 with the engagement roller 6 is regulated by an adjustable stopper 13 attached to the frame. Additionally, a tripping electromagnet 14 is placed between the frames 12 and 15 to move the tripping hook 7 in the tripping direction, that is, in the direction in which it is disengaged from the engagement roller 6 (clockwise rotation in FIG. 2). It is fixedly installed, and the tripping hook 7 is pushed and rotated by the rod 14b of the movable iron core 14a. In the figure, reference numeral 16 indicates a spring that pushes back the movable core 2, and reference numeral 17 indicates a stopper for the movable core. Further, the operating shaft 3 is rotatably supported at both ends by bearings 18 fixed to the side frame 8.

FIG. 2 shows the closed state of the vacuum switch. At this time, the tripping hook 7 comes into contact with the stopper 13 and its counterclockwise rotation is restrained, and the distal end surface of the protrusion 7a engages with the engagement roller 6. Therefore, clockwise rotation of the operating shaft 3 is prevented, and the closed state is mechanically maintained. Therefore, even if the operating electromagnet 1 is demagnetized, the closed state is maintained.

Next, in order to disconnect, the tripping electromagnet 14 is first energized, and the movable iron core 14a and rod 14b act to push the tripping hook 7 a predetermined stroke in the clockwise direction in FIG. Then, the tip end surface of the protrusion 7a escapes from the engagement roller 6, and the roller becomes movable along the upper surface of the protrusion 7a, and the operating shaft 3 is rotated clockwise in FIG. direction and becomes disconnected. At this time, even if the tripping electromagnet 14 is demagnetized, the operating shaft 3 is restrained by the tripping hook 7 on which the torsion coil spring 10 acts via the roller arm 4, and the disconnected state is maintained.

To return to the closing state, the operating electromagnet 1 is energized and the operating shaft 3 is rotated counterclockwise in FIG. 2 with a strong force that overcomes the torsion coil spring 10 acting on the tripping hook 7. Then, the roller arm 4 rotates while rolling the engaging roller 6 along the upper surface of the protrusion 7a, and at the same time rotates the tripping hook 7 slightly clockwise in FIG. 2 to bring it into the state shown in FIG. This is the result.

However, the conventional latch mechanism described above has the following drawbacks.

First, since the movable core 2 and roller arm 4 of the operating electromagnet 1 are both attached to the operating shaft 3, it is necessary to adjust the mounting position of both, especially the roller arm 4 in relation to the movable core 2, and the operation When the electromagnet 1 is attracted, adjusting the stable positioning of the engagement relationship between the roller arm 4 and the tripping hook 7 takes time and requires highly skilled work.

Second, since the roller arm 4 is provided near the end of the operating shaft 3, a large unbalanced load and torsion acts on the operating shaft 3 in the closed state, and the operating shaft 3 withstands the unbalanced load and torsion. It requires rigidity and the shaft must be thick. If the operating shaft 3 bends or twists due to unbalanced load or twisting,
The pressure contact state of the vacuum interrupter is not the same for the three phases and changes, which is undesirable. Furthermore, it was necessary that the roller arm 4 be strong.

The present invention was made in order to solve the above-mentioned drawbacks of the conventional vacuum switch latch mechanism.For this reason, in the present invention, the latch mechanism has an engaging roller that is connected to one side of the movable core of the operating electromagnet. It is characterized by being attached to the edge.

An operating shaft that mechanically moves on the operating shaft of the vacuum interrupter, which is pivotally attached to the frame, and a movable iron core that is a magnetic plate member that is integrally fixed to the operating shaft.
A bracket bent inward at a nearly right angle is integrally formed at the side edge of the movable core at the height of the engagement roller, and is rotatably installed on the outside of the shaft that is fixed by passing through the bracket. The middle part is pivotally connected to the engaging roller and the shaft member of the frame, and one end of the engaging roller is engaged with the engaging roller to maintain the closed state in which the movable iron core of the operating shaft is attracted to the operating electromagnet used for opening and closing operations. and a trip hook having a spring that biases the hook into the engaged state.

Embodiments of the present invention will be described below with reference to the drawings.

3 and 4 show the latch mechanism of the present invention,
Components common to those of the conventional example shown in FIGS. 1 and 2 are given the same reference numerals. The major difference between the present invention and the conventional example is that the engaging roller 6 is attached to the movable core 2 of the operating electromagnet 1, thereby eliminating the need for the conventional roller arm 4. That is, as shown in FIG. 5, which shows the related structure between the movable core 2 and the engagement roller 6, the movable core 2 is located at the engagement roller installation height on the left side edge in the figure, and is approximately perpendicularly inward. A bent bracket 2a is integrally formed,
An engaging roller 6 is rotatably attached to an outer portion of a shaft 21 which passes through the bracket 2a and is fixed with a nut 20.

A tripping hook 7 that engages with the engagement roller 6 is rotatably installed on a shaft 9 fixed to a side frame 8, and is constantly biased in the direction of engagement with the engagement roller 6 by a torsion coil spring 10. Regarding the point that
This is the same as the conventional example shown in FIG.

Next, to explain the operation of the latch mechanism of the present invention, FIGS. 3 and 4 show the closed state. That is, the protrusion 7a of the tripping hook 7 stopped by the stopper 13 engages with the engagement roller 6, and prevents the operating shaft 3 from rotating clockwise in FIG. 4 via the movable core 2. The closed state is mechanically maintained.

To change from this state to the disconnected state, the tripping electromagnet 14 is energized and the tripping hook 7 is pushed and turned clockwise in FIG. 4. As a result, the protrusion 7a escapes from the engagement roller 6, and the engagement roller 6
a, the operating shaft 3 rotates clockwise in FIG. 4, becomes disconnected, and maintains this state.

To make it into the closed state again, the operating electromagnet 1 is energized, the movable iron core 2 is attracted, and the operating shaft 3 is turned on.
Rotate counterclockwise in Fig. 4. Then, the engaging roller 6 rolls along the upper surface of the protrusion 7a of the tripping hook 7, pushing the protrusion 7a slightly and causing it to rotate, resulting in the state shown in FIG. 4.

Since the latch mechanism of the vacuum switch according to the present invention has the above-mentioned configuration, it has the following effects. That is,
By attaching the engagement roller directly to the movable core of the operating electromagnet, we have made the conventional roller arm unnecessary, which simplifies the configuration and reduces the number of parts. , the engagement is stable because it does not fall or shift. In addition, since the engaging roller is directly attached to the side surface of the movable iron core, the engaging roller can be attached and positioned at the same time as the movable iron core is attached to the operation shaft, and the latch mechanism can be assembled easily.
Positioning adjustment and maintenance become easier. Furthermore, all of the mechanical force that the engaging roller receives when the latch mechanism is activated is borne by the operating shaft through the movable core, and since the movable core is mounted in the center of the operating shaft with a well-balanced left and right balance, the operating shaft The biased load and torsion effect that are applied are alleviated, and the diameter of the operating shaft can therefore be reduced.

[Brief explanation of the drawing]

1 and 2 are a front view and a sectional view showing the latch mechanism of a conventional vacuum switch, FIGS. 3 and 4 are front views showing an embodiment of the latch mechanism according to the present invention, and FIG.
The figures are a sectional view taken along the line A-A in FIG. 4, FIG. 6 is a front view showing an example of a conventional vacuum shield disconnector, and FIG. 7 is a side view thereof. 1... Operating electromagnet, 2... Movable iron core, 3...
Operating shaft, 6... Engagement roller, 7... Trip hook, 10... Torsion coil spring, 13... Stopper, 14... Trip electromagnet.

Claims (1)

[Claims for Utility Model Registration] An operating shaft 3 that is pivotally attached to a frame 8 and mechanically interlocks with the operating shaft of the vacuum interrupter, and a movable iron core 2 that is a magnetic plate member that is integrally fixed to the operating shaft 3. A bracket 2a bent inward at a substantially right angle is integrally formed at a position on the side edge of the movable core 2 at the engagement roller installation height, and a shaft 21 is fixed by passing through the bracket 2a. an engaging roller 6 rotatably installed on the outer side, and an intermediate portion pivotally connected to the shaft member of the frame 8;
One end of the movable iron core 2 of the operating shaft 3 is engaged with the engaging roller 6, so that the movable iron core 2 of the operating shaft 3 can be maintained in the closed state where it is attracted to the operating electromagnet 1 used for opening/closing operations, and the engaged state can be maintained. A latching mechanism for a vacuum switch, characterized in that it comprises a tripping hook 7 having a spring 10 biasing the latching mechanism.