JPS6161490B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a closing operation mechanism for a breaker.

Conventional sink disconnectors require a large throwing force when they are turned on, but it is desired that this turning force be reduced, that the closing operation can be performed reliably, and that the device be small and inexpensive. There is.

For example, in a vacuum shield, the vacuum valve is normally maintained at a high vacuum of 10 ^-5 mmHg or less, and other shields, such as oil shields, disconnectors, magnetic It has greater dielectric strength and arc extinguishing ability than disconnectors, etc. Therefore, the contact gap is smaller than other shingle breakers, and the contact structure is a butt contact structure. Furthermore, because the dielectric strength and arc extinguishing ability are large, the required closing speed is lower than that of other open circuit breakers, or even lower, to avoid abnormal wear and welding of the contacts due to the floating phenomenon, or the generation of abnormal voltages as much as possible. There must be.

Figures 1A and 1B show an example of a conventional manual spring-operated vacuum shield disconnector, in which 1 is a vacuum valve, 2 is an insulating frame to which the vacuum valve is fixed, and is linked to an operating mechanism 3. Contacts within the vacuum valve 1 are operated via the operating shaft 4. 5 is a manual operation handle.

FIG. 2 shows an example of the operating mechanism 3 of the spring-operated vacuum shield breaker shown in FIGS. 1A and B, in which the operating shaft 11 corresponds to the operating shaft 4 in FIG. is rotated by the operating handle 5 shown in FIG. The link 13 is connected to the rotation shaft 14 of the operating lever 12, a link 15 is connected to the free end of the link 13 via a pin 13A, and a closing link 16 is connected to the other end of the link 15 via a pin 15A. A closing lever 17 fixed to the operating shaft 11 is connected to the other end of the loading link 16 via a pin 16A. On the other hand, a hook 19 connected to the operating lever 12 via a pin 18 is adapted to engage with a pin 15A attached to the closing link 16 when the operating lever 12 is operated. Further, the other end of a closing spring 22, which has one end hooked to a bracket 21 of the frame 20, is hooked to the closing link 16. In addition, 23 is link 13
The latch 24 that engages the free end of is a tripping coil, and when an overcurrent flows in the main circuit, the tripping coil 24 moves the latch 23 from the dashed line position to the solid line position.

When the operating lever 12 is rotated counterclockwise, the hook 19 connected to the operating lever 12 causes the
The closing link 16 rotates clockwise about the pin 16A to extend the closing spring 22. Furthermore, since the latch 23 is urged counterclockwise by the spring 25 about the shaft 24A, the pin 13A of the link 13 moves to the left position P by operating the operating lever 12, and the latch 23 and the pin 13A move to the left. 13
When the engagement with A is released, it moves from the position indicated by the solid line to the position indicated by the dashed-dotted line. Hook 19 is stopper 26
When the operating lever 12 is further rotated after contacting the hook 19, the hook 19 rotates clockwise about the pin 18. As a result, the input link 16 is released from the hook 19, and the toggle link constituted by the link 15 and the input link 16 is operated by the spring force stored in the spring 22, with the position P of the pin 13A as a fixed point. The input lever 17 is rotated counterclockwise, the operating shaft 11 is rotated, and thus,
A shiya disconnector is thrown in.

As described above, in the conventional configuration, the input link 16 and the link 15 form a toggle link mechanism with the position P of the pin 13A connecting the links 13 and 15 as the fixed center, so input energy is unevenly distributed. , excessive input power is required.

Figure 3 shows the load characteristics of the vacuum shield breaker constructed in this way, where a is the self-closing force, b is the arm breaking spring force, c is the wipe spring force, and e is a+b+c, that is, the combined load force. 2, and f indicates the closing force by the toggle links 15 and 16 whose fixed center is the position P shown in FIG. In the range from near the closing point to the closing position, the wipe spring force c and the shear spring force b are superimposed, resulting in a very large force. Therefore, if the above-mentioned closing force f due to the toggle link is made to exceed the composite load force e, the loading force f and the composite load force will be Surplus energy _E1 is generated between E and e. The input speed V ₁ at the closed pole point is expressed as follows using this energy E ₁ .

E ₀ is the energy loss due to friction such as running out of grease, and m is the mass of the link mechanism.

In other words, when the charging speed is determined from this equation, it is approximately twice or more than the optimum charging speed.

In this way, in the conventional loading operation mechanism,
Since the distribution of the input force does not match the composite load force e, the input speed becomes too fast. Furthermore, the portion where the resultant load force e is greater than the input force f is overcome by the momentum of the input energy _E1 , and the input is completed only when the resultant load force e reaches the position where it becomes smaller than the input force f. Extremely unstable. Therefore, in order to reduce the input speed, input energy is
If E ₁ is made small, it may become impossible to input. Note that even if you set the closing force f as shown in Fig. 3, loading may become impossible due to an increase in energy _E0 , so if you increase the closing spring force to avoid this, the closing speed will further increase. grow bigger,
There is a possibility that the contact will fall, and the arc energy will destroy the arc extinguishing chamber, and there will also be problems such as abnormal wear and welding of the contact, or generation of abnormal voltage.

In addition, since the electrode material uses a highly conductive material, such as copper, the electrode material becomes hot during the manufacturing process due to brazing welding, etc., and the material tends to soften.
If the charging speed is high, the electrode material may be deformed.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a closing operation mechanism for a breaker that can obtain a distribution of input energy that matches the characteristics of the composite load force.

That is, the present invention includes an operating shaft that is connected to a shield section having a contact point for breaking or breaking a circuit to open and close the contact, and a charging shaft that is connected to a closing lever fixed to the operating shaft and has a rolling roller attached thereto. a link, a cam lever having a cam surface on which the rolling roller rolls, and a latch that engages with the cam lever to prevent rotation of the cam lever when the cam lever is turned on and disengages from the cam lever when the cam lever is pulled out. , a closing spring having one end hooked to the closing link, and an operating lever that engages with the closing link to rotate the closing link and extend the closing spring, and when closing, the operating lever causes the closing spring to be extended. By storing spring force in the closing spring,
The operation lever engages the cam lever and the latch to prevent rotation of the cam lever and establish the cam surface, and at the same time disengages the closing link from the operation lever, and the spring force The closing link is operated while rolling a rolling roller on the cam surface, and the operating shaft is rotated via the closing lever to close the contact.

The present invention will be explained below based on the drawings. In addition, the same reference numerals are given to the same parts in FIG. 4 and below.

In FIG. 4, the operation lever 31 includes a cam lever 32 and a hook 33, and a rotation shaft 34 and a pin 3.
5, and by operating the operating lever 31 as described below, the pin 3 of the closing link 36
7 so that the hook 33 is engaged. Further, a closing lever 39 fixed to an operating shaft 38 is connected to the closing link 36 via a pin 40, and the other end of a closing spring 43, whose one end is hooked to a bracket 42 of a frame 41, is hooked to the closing link 36. . Furthermore,
A roller 44 is attached to the end of the input link 36, and this roller 44 is connected to the cam 45 of the cam lever 32.
Keep it rolling on the surface. 46 is pin 47
A latch 48 rotates around a pin 49, and when it is turned on,
Attach the cam lever 32 to one end of the latch 46 with the pin 45A.
As a result, the movement of the operating shaft 38, which is about to rotate clockwise due to the wipe spring force or the cut spring force of the vacuum valve (not shown), is prevented by the closing lever 39 and the closing link 36. and is blocked via the cam lever 32. Further, clockwise rotation of the latch 46 at the time of closing is stopped by a pin 50 attached to the latch 48. Further, 51 is a tripping coil, and 52 is a trip lever rotatable around the pin 49.

FIG. 4 shows the closing state of the closing operation mechanism, and the operating shaft 38 has a wipe spring force (FIG. 3 c), a cutting spring force (FIG. 3 b), and a closing spring 43 in the cutting direction. Although a clockwise force is exerted by the force (FIG. 3d), the operation shaft 38 is prevented from rotating by blocking the operation of the closing link 36 by the cam lever 32. That is, the latch 46 engages the cam lever 32 which engages the closing link 36 via the roller 44. Further, clockwise rotation of the latch 46 is prevented by a pin 50 of the latch 48. The clockwise biasing force acting on the latch 46 is set to about 1/20 of the biasing force acting on the operating shaft 38, so that the latch 46 can be released from the pin 50 with a small force, and the small capacity tripping coil 51 This allows the tripping operation to be performed more easily.

FIG. 5 shows the closing operation mechanism in a closed state, in which the latch 48 rotates clockwise due to the tripping operation by the tripping coil 51, and the latch 46 and pin 50
The latch 46 is disengaged from the latch 46 and rotates clockwise. As a result, the cam lever 32 is released from the latch 46, and the operation of the closing link 36 that has been blocking the clockwise biasing force of the operating shaft 38 is released, so that the operating shaft 38 comes into contact with a stopper (not shown). Then, the shear cutting is performed. Note that by rotating the operating lever 31 clockwise, the trip lever 52 that engages with the pin 31A of the operating lever 31 can be rotated clockwise, and the latch 48 can be rotated clockwise. It can be tripped manually.

FIG. 6 shows the closing operation mechanism in a state in which the closing spring is ready to be charged. When the operating lever 31 is rotated clockwise, the hook 33 engages with the pin 37 of the closing lever 36. FIG. Next, when the operating lever 31 is rotated counterclockwise, the hook 33 rotates the closing link 36 clockwise, causing the closing spring 43 to extend.
At the position where the hook 33 comes into contact with the stopper 53, the force stored in the closing spring becomes maximum. On the other hand, input link 36
When the pin 54 coaxial with the roller 44 contacts the contact surface 32A of the cam lever 32 as described above, the cam lever 32 begins to rotate counterclockwise. Since a crank 55 connected to the latch 46 is attached to the pin 45A at the free end of the cam lever 32, the latch 46 follows the counterclockwise rotation of the cam lever 32 and rotates in the same direction.
On the other hand, since the latches 46 and 48 are connected via the crank 56, the latch 48 also rotates counterclockwise. In this manner, end 46A of latch 46 and pin 50 of latch 48 are engaged;
Also, the latch 46 is connected to the pin 45A of the cam lever 32.
Since the cam lever 32 is engaged with the cam lever 32, the clockwise rotation of the cam lever 32 is prevented. As a result, when the engagement between the hook 33 and the input link 36 is released, the operating shaft 38
A cam surface of cam 45 is established that defines the desired drive characteristics of cam 45 . Since the engagement between the latches 46 and 48 is done mechanically by the cranks 55 and 56,
The latch can be engaged reliably without being affected by individual differences in operating speed, and there are fewer malfunctions.

FIG. 7 shows the state immediately before the start of the closing operation of the operating mechanism. When the operating lever 31 is operated to the position where the hook 33 comes into contact with the stopper 53, the cam lever 32 engages with the latch 46 as shown in FIG. At the same time, the latch 46 engages the pin 50 of the latch 48, and the closing link 3
6 pin 54 is on the pin contact surface 32 of the cam lever 32
It is located in the relief part 32B from A. Here, when the operating lever 31 is further rotated, the hook 33 is rotated clockwise, and the engagement link 36 is rotated.
Since the closing link 36 is detached from the pin 37, the closing link 36 is rotated counterclockwise by the spring force of the loaded closing spring 43. At that time, the closing link 36 operates while its roller 44 rolls on the cam surface of the cam 45 attached to the cam lever 32, and the operation shaft 38 rotates counterclockwise to enter the closing state shown in FIG. 4. .
Incidentally, at the time of closing, a damper 62 attached to the closing lever 36 is brought into contact with a stopper 63. At this time, the cam lever 32 is prevented from rotating by the latch 46, as described above, and therefore the cam lever 32 is prevented from rotating as shown in FIG.
The roller 44 rolls on the cam surface of 5, and the operating shaft 38
The desired driving characteristic (curve g in FIG. 3) is obtained. As mentioned above, in the embodiment of the present invention,
Since the closing lever 39, closing link 36, roller 44, and cam 45 constitute a link mechanism equivalent to a so-called multi-joint link mechanism, the load characteristics of the vacuum shield breaker are affected as shown by curve g in Fig. 3. It was possible to obtain a suitable input force, reduce the input force from the shearing position to just before the closing point, and make it possible to adapt the input distribution from the closing point to the closing position to the load characteristics.

That is, between the shearing position and the closing point, the input force g follows the composite load force e, so the surplus energy E ₂ between the input force g and the composite load force e is Surplus energy E ₁ due to force f
less compared to Therefore, the injection speed at the closed pole point
_V2 is As a result, the closing speed can be made slower than before, and an almost optimal closing speed can be obtained, making it possible to reduce the phenomenon of contact dancing during closing, thereby preventing destruction of the arc chamber, abnormal wear and tear of contacts, and abnormal voltage. It is possible to prevent such occurrence. Furthermore, since the closing force g exceeds the combined load force e from the closing point to the closing position, a reliable and highly reliable closing operation is possible. Furthermore, since excess energy loss is reduced, the closing spring force can be reduced, and the closing operation force can therefore be reduced.

In this embodiment, the operating lever 31 can be operated either manually or electrically. When operating the operating lever 31 electrically, as shown in FIG. 6, a cam 60 connected to a motor shaft (not shown) is used. Operation lever 3
1 shall be operated. That is, the cam 60 is rotated clockwise, and the operating lever 31 is rotated counterclockwise about the shaft 34 via the roller 61 attached to the operating lever 31.

As explained above, according to the present invention, the roller attached to the closing link rolls on the cam surface of the cam lever during the closing operation, and the spring force of the closing spring is applied using a configuration equivalent to a so-called multi-joint link mechanism. is transmitted to the operating shaft, so by appropriately determining the relative positional relationship between the link and the cam, the energy distribution of the closing force can be set in accordance with the load characteristics of the disconnector, and the closing speed can be further increased. Can be made smaller. Therefore, the operating force required at the time of closing is reduced, and the phenomenon of contact swinging is suppressed, thereby making it possible to prevent the above-mentioned problems caused by this.

Although the present invention has been described above based on a vacuum breaker, it goes without saying that the present invention can be applied to other breaker switches and switches having this type of operating mechanism.

[Brief explanation of the drawing]

Figures 1A and B are front and side views showing an example of a manual spring-operated vacuum shield disconnector, and Figure 2 is a configuration diagram showing an example of the operating mechanism of a conventional spring-operated vacuum shield disconnector. , Fig. 3 is a diagram illustrating the load characteristics and closing force of the vacuum sheath disconnector, Fig. 4 is a configuration diagram showing the closing state of the closing operation mechanism according to the present invention, and Fig. 5 is the same diagram showing the sheath disconnection state. FIG. 6 is a configuration diagram showing the closing spring energy storage preparation state, and FIG. 7 is a configuration diagram showing the state immediately before the closing operation is started. 1... Vacuum valve, 2... Insulating frame, 3...
...Operating mechanism, 4, 11, 38... Operating axis, 5...
Manual operation handle, 12, 31...operation lever,
13, 15... Link, 14, 34... Rotating shaft,
13A, 15A, 16A, 18, 31A, 35,
37, 40, 45A, 47, 49, 50, 54...
...Pin, 16,36...Insertion link, 17,39
...Loading lever, 19,33...Hook, 20,
41...Frame, 21,42...Bracket,
22, 43... Closing spring, 23, 46, 48...
Latch, 24, 51...Tripping coil, 24A...
... shaft, 25 ... spring, 26, 53 ... stopper,
32...Cam lever, 32A...Contact surface, 32B
...Escape part, 44,61...Roller, 45,60
...Cam, 46A...End, 52...Trip lever, 55, 56...Crank, 62...Damper, 63...Stopper.

Claims (1)

[Claims] 1. An operating shaft that is connected to a blade breaking section that has a contact that breaks a circuit to open and close the contact; a closing link that is connected to a closing lever that is fixed to the operating shaft and has a rolling roller attached thereto; a cam lever having a cam surface on which a rolling roller rolls; a latch that engages with the cam lever when closing to prevent rotation of the cam lever; and disengages from the cam lever when pulled out; and the closing link. has a closing spring with one end hooked to the closing spring, and an operating lever that engages with the closing link and rotates the closing link to extend the closing spring. Accumulating force, the operating lever engages the cam lever and the latch to prevent rotation of the cam lever and establish the cam surface, and disengages the closing link from the operating lever. The closing link is operated while the rolling roller is rolled on the cam surface by a spring force, and the operating shaft is rotated via the closing lever to close the contact point. Closing operation mechanism for the breaker.