JP2003217408A - Breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breaker capable of controlling the operating force during the opening/closing operation without changing the output characteristic of an operation device or without using an operation device having a greater output. <P>SOLUTION: The breaker comprises a movable contact 2 which can be in contact with and separate from a fixed contact 1, an operation member 13 for effecting the contacting and separating actions of the movable contact 2, and an operation device 3 linked to the operation member 13 via a linking means 100 to drive the operation member 13. The linking means 100 has a first linking member 25, a second linking member 26, and a guide link 20 each provided between the operation member 13 and the operation device 3. The first linking member 25 is provided on the operation member side. The second linking member 26 is provided on the operation device side and turnably linked to the first linking member 25. One end of the guide link 20 is turnably linked to a linking portion between the first and second linking members 25 and 26, and the other end is pivotally supported by a fixed part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker preferably used in a power switchgear installed in, for example, a substation or a switchyard.

[0002]

2. Description of the Related Art FIG. 9 and FIG.
FIG. 10 is a cross-sectional view of a main part showing a structural example of a conventional circuit breaker disclosed in Japanese Laid-Open Patent Publication No. 74223, etc., FIG. 9 showing a closed state, and FIG. 10 showing an opened state. In the figure, 5 is a tank, and the inside thereof is filled with SF ₆ gas having high electric insulation. Reference numeral 11 is a fixed arc contact, 1 is a main fixed contact, and 15 is a piston. The fixed arc contact 11, the main fixed contact 1, and the piston 15 are fixed in the tank 5. 9 is a movable arc contact, 2 is a main movable contact, 10 is a puffer cylinder,
Reference numeral 13 denotes an operation rod, and the movable arc contact 9, the main movable contact 2, and the puffer cylinder 10 are fixed to the operation rod 13 as an operation member.

On the other hand, 6 is an output lever attached to an operating device (not shown), and 7 is an insulating rod connected to this output lever 6. A lever 8 is rotatably supported in the tank 5, and is connected to the insulating rod 7 and the operation rod 13 via a link.

Next, the contact opening operation will be described. FIG. 9 shows a closed state of the circuit breaker. When the circuit is opened, the output lever 6 of the operating device is rotated clockwise, the insulating rod 7 moves downward in the figure, and the lever 8 rotates clockwise. The operating rod 13 is moved to the right in the figure. Here, the lever 8 converts the vertical movement of the insulating rod 7 into the horizontal direction of the operating rod 13, and the stroke of the insulating rod 7 is multiplied by the arm length ratio l ₂ / l ₁ of the lever 8 so that the insulating rod 7 Is multiplied by l ₁ / l ₂ and transmitted to the operating rod 13.

By the movement of the operating rod 13, the movable arc contact 9 and the main movable contact 2 provided integrally with the operating rod 13 are driven collectively. At this time, the main fixed contact 1 and the main movable contact 2 are separated first, and then the fixed arc contact 11 and the movable arc contact 9 are separated, and the SF ₆ gas in the puffer cylinder 10 is compressed by the piston 15 to form a pair of arc contacts. 11,
It is sprayed on the arc (not shown) generated between 9
The arc is extinguished and the interruption is complete. This open state is shown in FIG.

The closing operation is performed as follows. In FIG. 10, when the output lever 6 is rotated counterclockwise by an operating device (not shown), the insulating rod 7 linked to the output lever 6 moves upward in the drawing, and the lever 8 rotates counterclockwise. Then, the operating rod 13 is moved leftward in the figure. Due to the movement of the operating rod 13, the movable arc contact 9 and the fixed arc contact 11 come into contact with each other, and then the main movable contact 2 and the main fixed contact 1 come into contact with each other, thus completing the closing.
This closed state is as shown in FIG.

[0007]

In the conventional circuit breaker, the stroke and load are controlled by the lever 8 by the lever ratio l ₂
Although it can be changed according to / l ₁ , it is not easy to change the partial output characteristics of the stroke, and the withstand voltage characteristics (advance small current interruption performance) for transient recovery voltage immediately after current interruption is improved. Therefore, it is necessary to increase the speed in the initial stage of the opening operation or to increase the operating load in order to resist the reaction force due to the increase in the puffer chamber pressure in the latter half of the opening operation. It was necessary to adopt a device or to change the output characteristics by improving the standard operating device itself. Further, the lever 8 needs to be made to have a sturdy structure so as to withstand a large force associated with the opening / closing operation.

The present invention has been made to solve the above-mentioned problems of the prior art, without changing the output characteristics of a standard operating device or using an operating device having a larger output. An object of the present invention is to provide a circuit breaker capable of controlling the operating force during opening / closing operation. It is another object of the present invention to provide a circuit breaker capable of reducing the weight of the lever that constitutes the link means.

[0009]

SUMMARY OF THE INVENTION A circuit breaker according to the present invention comprises a movable contact which is provided so as to be able to come into contact with and separate from a fixed contact, an operating member which brings the movable contact into and out of motion, and a link to the operating member. A circuit breaker provided with an operating device for driving the operating member, the linking device being interposed between the operating member and the operating device and connected to the operating member side. One link member, a second link member that is rotatably connected to the first link member, and is connected to the operating device side, and one side portion of the first link member and the second link member. The guide link is rotatably connected to the connecting portion and the other side portion is pivotally supported by the fixed portion.

Further, the link means includes an operating member and the first member.
Of the first link member and the third link member, one side portion of which is pivotally supported by a support shaft provided in the fixed portion and the other side portion of which is interposed between the first link member and the third link member. A first lever connected to the connecting portion, a fourth link member interposed between the operating device and the second link member, one side part is pivotally supported by the support shaft, and the other side part is the above. A second lever connected to the connecting portion of the second link member and the fourth link member.

Further, the linking means is provided with an engaging means at a predetermined portion, and the driving force of the operating device is used to store energy through the engaging means of the linking means during the closing operation, so that the linking operation is performed in the initial process. It is provided with energy storage means for releasing the stored energy.

Further, the energy storing means is engaged with an auxiliary lever rotatably provided on the fixed portion, and an engaging means which is engaged with the auxiliary lever so as to freely move in and out and one end of which is provided on the link means. And a spring member for urging the plunger member toward the engaging means,
During the closing operation, the spring member is energized via the engaging means and the plunger member, and in the initial stage of the opening operation, the spring member thus energized increases the speed of the link means in the opening direction. It will be done in this way.

Further, the plunger member has a flange portion and a guide portion axially protruding from the flange portion, and the engaging means is rotatably provided on the link means. It has a pin with a hole having a through hole through which the guide portion of the member is inserted.

In the closed state, the plunger member is pressed against the engaging means at an angle of 70 ° to 110 ° with respect to the moving direction of the engaging means.

Further, in the circuit breaker according to the present invention, a movable contact which is provided so as to be able to come into contact with and separate from the fixed contact, and an operation member which makes the movable contact come into contact with and separate from the fixed contact.
In a circuit breaker including an operating device that is connected to the operating member by a link means and drives the operating member, the link means includes an engaging means at a predetermined portion, and the operating operation is performed during a closing operation. It is provided with energy storage means for storing energy by the driving force of the device through the engaging means of the link means and releasing the stored energy in the initial process of the opening operation.

Furthermore, in the circuit breaker according to the present invention, a movable contact which is provided so as to be able to come into contact with and separate from a fixed contact, an operating member which makes the moving contact come into contact with and separate from the fixed contact, and a link means is connected to the operating member. A circuit breaker provided with an operating device for driving the operating member, wherein the linking means has a first portion pivotally supported by a fixed portion.
Lever and a second lever pivotally supported by the fixed portion,
The first and second levers are connected to each other, and a connecting portion with the first lever is connected to the operation member side, and a connecting portion with the second lever is connected to the operation device side. It is a thing.

Further, the arc-extinguishing gas is compressed in accordance with the opening / closing operation of the pair of fixed and movable arc contacts which can be separated from each other, and the main movable contact coaxially provided outside the movable arc contacts. It is equipped with a puffer cylinder.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 to 3
1 shows a main part of the circuit breaker according to the first embodiment. FIG. 1 is a cross-sectional view of a main part showing a closed state, FIG. 2 is a cross-sectional view of a main part showing a state during opening operation, and FIG. It is a principal part sectional view which shows the state of extreme time. In the figure, 5 is a tank filled with SF ₆ gas, and 4 is a housing which is fixed to this tank 5 and whose inside is in an atmospheric environment. Reference numeral 1 is a main fixed contact as a fixed contact, 11 is a fixed arc contact projecting from the center of the main fixed contact 1, 1
Reference numeral 5 denotes pistons, which are fixedly provided in the tank 5.

Reference numeral 2 denotes a main movable contact as a movable contact which is provided so as to be able to come in contact with and separate from the main fixed contact 1. Reference numeral 9 denotes a fixed arc provided inside the main movable contact 2 integrally with the main movable contact 2. Contact 11
A movable arc contact which can be brought into contact with and separated from the main movable contact 2 is a puffer cylinder formed inside the main movable contact 2, and 13 is an operation rod which is fixedly provided to the main movable contact 2 and the movable arc contact 9. is there. On the other hand, 3 is an operating device for driving the operating rod 13, 6 is an output lever attached to the output shaft 17 of the operating device 3, and these are provided inside the housing 4.

A seal rod 12 is connected to the output lever 6 via a link rod 18, and is provided so as to penetrate a boundary wall which divides the tank 5 and the housing 4. Reference numeral 16 denotes a seal, which prevents SF ₆ gas filled in the tank 5 from leaking from the penetrating portion of the seal rod 12. 7 is an insulating rod, and a seal rod 12
Are linked to. Reference numerals 21, 22, and 31 are support shafts that are fixedly provided to the fixed portion in the tank 5. 23 and 24
Are a first lever and a second lever that are pivotally supported by the support shaft 21 and can rotate independently of each other.

Reference numeral 25 is a first link member, which is connected to the first lever 23 by a pin P1 which is a pivot, and 26
Is a second link member, which is connected to the second lever 24 by a pin P2 which is a pivot, and the first link member 25 and the second link member 26 serve as a connecting portion forming a pivot. They are connected to each other by pins 27. Reference numeral 20 denotes a guide link, one side of which is pivotally supported by a support shaft 22 and the other side of which is pivotally supported by the common pin 27. Reference numeral 14 is a link rod (third link member) that connects the link member 25 and the operation rod 13, and the operating device 3 side is common to the first lever 23 and the first link member 25. Are connected by a pin P1.

Numeral 19a is an engaging portion as an engaging means provided at the tip of the first lever 23, 32 is an auxiliary lever pivotally supported by the support shaft 31, and 33 is freely movable in and out of the auxiliary lever 32. The inserted plunger member 33a is a flange portion provided at a substantially central portion in the axial direction of the plunger member 33, and 35 is interposed between the flange portion 33a and the auxiliary lever 32. A spring for urging the engaging portion 19a, a spring member 36 for urging the auxiliary lever 32 to rotate in the counterclockwise direction, and a fixed member 34 provided inside the tank 5 for fixing the auxiliary lever 32 in the counterclockwise direction. Stoppers that regulate the rotation of the
Reference numeral 1 is an energy storage means composed of the above 31 to 36. The plunger member 33 is pressed against the engaging portion 19a by the spring member 35 as shown in FIG. 1 when the circuit breaker is in the closed state.

Reference numeral 100 designates the operating rod 13 and operating device 3 described above.
Link materials and rods 7, 12, 1 interposed between and
4, 18, 25, 26, the levers 20, 23, 24, the pins P1, P2, 27, 30, and the support shafts 21 and 22, and the like. Other configurations such as an insulating support structure are the same as those of the conventional device, and therefore illustration and description thereof are omitted.

Next, the first embodiment configured as described above
The opening operation of the circuit breaker will be described with reference to the drawings. In the closed state of the circuit breaker shown in FIG. 1, the direction in which the plunger member 33 of the energy storage means 51 pushes the engaging portion 19a is the line direction connecting the engaging portion 19a and the support shaft 21 in the first embodiment. Since the load of rotating the first lever 23 by the spring member 35 is suppressed and the load of the spring member 35 is not transmitted to the operating device 3 in the closed state, the starting characteristic of the operating device 3 is I try not to change.

When the opening command is issued, the output lever 6 is rotated counterclockwise by the operating device 3, the link rod 18, the seal rod 12 and the insulating rod 7 move downward in the figure, and the second lever is moved. 24 rotates clockwise.
The first link member 25 and the second link member 26 also move in the clockwise direction around the support shaft 21 in conjunction with the rotation of the second lever 24, and the first lever 23 moves around the support shaft 21. Rotate clockwise. When the first lever 23 starts to rotate in the clockwise direction, the plunger member 33 of the energy accumulating means 51 rotates in the counterclockwise direction around the support shaft 31 in a state of being in contact with the engaging portion 19a. A load is generated in a direction that promotes clockwise rotation of the lever 23 of No. 1.

When the first lever 23 rotates clockwise to some extent, the plunger member 33 and the engaging portion 19a are separated from each other, and the auxiliary lever 32 is pressed against the stopper 34 by the spring 36, as shown in FIG. It becomes a state. on the other hand,
The movement of the pin 27 connecting the first link member 25 and the second link member 26 is controlled by the guide link 20, and when the second lever 24 pivots clockwise to some extent, as shown in FIG. Link member 25 and second
The link member 26 is bent, and the distance between the pin P2 and the pin P1 decreases. That is, in the process of the initial opening operation, the second
The rotation speed of the first lever 23 is higher than that of the lever 24.

Now, when the first lever 23 rotates clockwise, the operation rod 13 is moved through the third link member 14.
Are moved to the right in the figure. With the movement of the operating rod 13,
The movable arc contact 9 and the main movable contact 2 which are integral with this are collectively driven. At this time, the main fixed contact 1 and the main movable contact 2 are separated first, then the fixed arc contact 11 and the movable arc contact 9 are separated, and the SF ₆ gas in the puffer cylinder 10 is separated by the piston 15.
Is compressed by and is blown to the arc generated between the arc contacts, the arc is extinguished, and the interruption is completed.
(SF ₆ gas and arc are not shown)

This open state is shown in FIG. Here, FIG.
Then, the first link member 25 and the second link member 26
Is in a bent state, the first link member 25 and the second link member 26 are substantially linear in FIG.
The distance between 1 and the pin P2 has increased. That is, in the latter half of the opening operation, the rotation speed of the first lever 23 is lower than that of the second lever 24.

Next, the closing operation will be described. The output lever 6 is rotated clockwise by the operating device 3, the link rod 18, the seal rod 12, and the insulating rod 7 move upward in the figure, and the second lever 24, the second link member 26, and the first Lever 23, first link member 25
Rotates counterclockwise and the operating rod 13 is moved to the left in the figure. In the latter half of the closing operation, the engaging portion 19a comes into contact with the plunger member 33, and the auxiliary lever 32 rotates clockwise and the spring member 35 is charged.

The closing operation at this time is in the braking process, and the kinetic energy of the movable part is usually absorbed and discarded by the braking device in the operating device 3. In this embodiment, the kinetic energy is the spring member. It is stored in 35 and is used again at the next opening. On the other hand, when the operation rod 13 moves to the left, the movable arc contact 9 and the fixed arc contact 1
1, then the main movable contact 2 and the main fixed contact 1 come into contact, and the closing operation is completed. This closed state is as shown in FIG.

As described above, according to the circuit breaker of the first embodiment, the guide link 20 controls the movement locus of the pin 27 which is the connecting portion between the first link member 25 and the second link member 26. Therefore, the relative rotation speed of the first lever 23 with respect to the second lever 24 is increased in the initial process of the contact opening operation, and the rotation speed of the first lever 23 is decreased in the latter half of the contact opening operation. As a result, the advance small current interruption performance can be improved.

In addition, the energy accumulating means 51 helps to increase the rotation speed of the first lever 23 in the initial stage of the opening operation, thereby further improving the advance small current interruption performance. Further, a part of the kinetic energy at the time of the final braking in the closing operation is taken into the energy storage means 51 and reused at the next opening operation, so that the energy is effectively used.

In the first embodiment, the guide link 2
0 means that the first link member 25 and the second link member 26
Although the speed of the operating rod 13 is increased in the initial process of the opening operation by controlling the movement locus of the pin 27 that is the connecting portion of the guide link 20, the first link member 2
It is possible to obtain different speed characteristics for the operating rod 13 by changing the positions and dimensions of the fifth and second link members 26. In addition, the first link member 2
5 and the second link member 26 may be interposed between the operation rod 13 and the operation device 3, and the first embodiment is not always necessary.
Need not be in the same position as.

In the first embodiment, the function of controlling the movement locus of the pin 27, which is the connecting portion of the first link member 25 and the second link member 26 by the guide link 20, and the energy storage means 51. However, even if only one of them is provided, it is possible to increase the speed of the operating rod 13 in the initial process of the opening operation and obtain the effect of improving the advance small current interruption performance. Therefore, for example, even if only the energy storage means 51 is provided in the conventional device, it is possible to increase the speed of the operating rod 13 in the initial stage of the opening operation and to expect the effect of improving the advance small current interruption performance.

Embodiment 2. 4 and 5 show a main part of the circuit breaker according to the second embodiment. FIG. 4 is a configuration diagram in a closed state and FIG. 5 is a configuration diagram in an open state. In the figure, 19
Reference numeral b denotes a pin with a hole as an engaging means, which is rotatably provided at the tip of the first lever 23 and has a through hole h formed in a direction orthogonal to the rotation axis. 33 is a flange portion 33
It is a plunger member having a rod-shaped guide portion 33b axially protruding from a, and the tip end direction is the auxiliary lever 3
The guide portion 33b is provided so as to be able to move in and out of the device 2, and is always inserted through the through hole h of the pin with hole 19b.

The other structure is the same as that of the first embodiment, and in the second embodiment, the flange portion 33a of the plunger member 33 of the energy storing means 51 has the first lever 23.
It is configured so as to abut on the outer peripheral portion of the pin 19b with a hole provided as an engaging means.

Next, the operation will be described. When the circuit breaker is in the closed state, the flange portion 33a is pressed against the holed pin 19b by the spring member 35 as shown in FIG. 4, but the guide portion 33b of the energy accumulating means 51 is connected to the holed pin 1b.
The direction in which 9b is pushed is made substantially coincident with the line direction connecting the pin with hole 19b and the support shaft 21 (not shown), and the spring member 35 suppresses the load of rotating the first lever 23, and closes like the first embodiment. In the polar state, the load of the spring member 35 is the operating device 3
Therefore, the starting characteristic of the operating device 3 is prevented from changing.

In the opening operation, when the first lever 23 starts to rotate in the clockwise direction, the flange portion 33a moves to the pin 1 with the hole.
The guide portion 33b rotates counterclockwise in a state of being in contact with the outer peripheral surface of 9b, and a load is generated in a direction that promotes clockwise rotation of the first lever 23. When the first lever 23 rotates clockwise to some extent, the flange portion 33a and the pin with hole 19b are separated from each other, and when the opening operation is completed, the guide portion 33b is inserted into the through hole h of the pin with hole 19b as shown in FIG. Stop in the inserted state.

In the closing operation, when the first lever 23 rotates counterclockwise, the flange portion 33a contacts the holed pin 19b in the latter half of the closing operation, and the spring member 35 is charged. . At this time, the spring member 35 is stored with a part of the kinetic energy of the movable part to be used for the next opening operation. This closed state is as shown in FIG.

As described above, according to the second embodiment, by the energy storage means 51, the turning speed of the first lever 23 is increased in the initial stage of the opening operation to increase the advance small current interruption performance. In addition, a part of the kinetic energy at the final braking of the closing operation can be taken into the energy storage means 51.
Since it is reused at the next contact opening, energy can be efficiently used, and the same effects as those of the first embodiment can be obtained, and the spring 36 and the stopper 34 shown in FIG. The effect is that it is simple and easy to assemble.

Embodiment 3. 6 and 7 are configuration diagrams showing a main part of a circuit breaker according to Embodiment 3 of the present invention. FIG. 6 shows a closed state, and FIG. 7 shows a state in the middle of closing and opening. . In addition, this example is the same as the first embodiment.
The third link member 14 in the tank 5 is replaced. In the figure, 141 and 14
2 is the first link and the second link respectively,
These are connected to each other by a pin 43. 44
Is a support shaft fixed to a fixed portion (not shown) in the tank 5,
45 is a guide link pivotally supported by the support shaft 44,
The guide link 45 is connected to the first link 141 and the second link 142 by a common pin 43. First link 141 and second link 142
Both ends of are connected to the pin 30 of the operation rod 13 and the pin P1 of the first lever 23, respectively. The other structure is similar to that of the first embodiment, and the description thereof is omitted.

Next, the operation will be described. In the closed state, the first link 141 and the second link 142 are substantially linear as shown in FIG. 6, but the guide link 45 is rotated clockwise as shown in FIG. 7 during the opening operation. The pin 43 moves upward in the drawing to bend the first link 141 and the second link 142, and the distance between the pin 30 and the pin P1 decreases. That is, in the initial stage of the opening operation, the moving speed of the pin 30 is higher than that of the pin P1, and the speed of the operating rod 13 is increased. At the end of the contact opening, the first link 141 and the second link 142 return to the straight line again, and the speed of the operating rod 13 decreases.

As described above, according to the third embodiment, the guide link 45 allows the first link 141 and the second link 141 to be connected.
By controlling the movement locus of the connecting pin 43 of the link 142 of
By increasing the speed of the operating rod 13 in the initial stage of the opening operation, it is possible to improve the advanced small current interruption performance.

In the third embodiment, the guide link 4
3, the operation loci of the connecting pins 43 of the first link 141 and the second link 142 are controlled to increase the speed of the operation rod 13 in the initial process of the opening operation. Link 141 and second link 14
It is also possible to obtain different speed characteristics with respect to the operating rod 13 by changing the position, size, etc. of 2. Further, in the third embodiment, the first link member 2 shown in FIG.
5, the control of the operation locus of the connecting portion (pin) 27 including the second link member 26 and the auxiliary lever 20 and the control of the operation locus of the connecting pin 43 are doubled. It is also possible to use only a mechanism for controlling the movement locus of the connecting pin 43.

Fourth Embodiment FIG. 8 is a main part configuration diagram showing a closed state of a circuit breaker according to a fourth embodiment of the present invention.
This embodiment corresponds to the conventional device shown in FIG. 9 with the lever 8 replaced. In the figure, reference numerals 23 and 24 respectively denote a first lever and a second lever, both of which are rotatably supported by a common support shaft 21. Reference numeral 46 denotes a link member, one side of which is connected by a pin 28 to a link 14 which is connected to a first lever 23 and an operating rod (not shown), and the other side is connected to a second lever 24 and an output lever of an operating device (not shown). It is connected by a pin 29 to the connected insulating rod 7. Other configurations are similar to those of the conventional device.

Next, the operation will be described. In the above configuration, the second lever 24, the first
Although a tension / compression load is generated in the lever 23 and the link member 46 of the second lever 24 and the first lever 2
No bending load is generated in 3.

Therefore, in the conventional lever 8, a large bending load is generated due to the load at the time of opening / closing operation, so it is necessary to firmly form the bending load. However, in the fourth embodiment, the first lever 23 and the second lever 23 are formed. Since it is not necessary to strengthen 24 as in the conventional lever 8, it is possible to reduce the weight by applying a lightweight material such as an aluminum material, and the cost of the component is reduced by simplifying the shape of the component structure. The effect that can be obtained is obtained.

In the above description of the embodiment, the case where the operating direction of the operating device 3 is orthogonal to the operating direction of the operating rod 13 as an operating member has been described, but the present invention is not limited to this. Of course. For example, the operating direction of the operating rod 13 and the operating direction of the operating device 3 may be the same. In this case, the structure of the link means can be simplified. Further, although the engaging means 19a or 19b is provided on the first lever 23 which constitutes the link means 100, the invention is not limited to this, and the link can be provided as long as it can store and release the same force. The same effect can be expected even if it is provided in another member constituting the means 100. Further, it goes without saying that the respective connecting means and the like which constitute the link means 100 are not limited to those of the embodiment, and for example, the pins may be replaced with other equivalent means.

The structure of the energy storage means 51 is not necessarily limited to that of the above-mentioned embodiment using the plunger member 33. Further, the direction in which the plunger member 33 presses the engaging means 19a, 19b is linear (that is, when the plunger member 33 is in the closed state, the plunger member 33 is at an angle of 90 ° with respect to the movable direction of the engaging means). However, the present invention is not limited to this, and in the closed state, the plunger member 33 pushes the engaging means at an angle of 70 ° to 110 ° with respect to the movable direction of the engaging means. The same effect as that of the above-described embodiment can be expected by the configuration of pressing. Furthermore, the case where the present invention is applied to the puffer type circuit breaker has been described, but the present invention is not necessarily limited to this.

[0050]

As described above, according to the present invention, the following effects can be obtained.

According to the first invention described in claim 1,
It is possible to provide a circuit breaker having special output characteristics or controlling an operating force during opening / closing operation with a simple configuration without using an operating device having a large output and improving the advance small current interruption performance.

According to the second invention described in claim 2,
In addition to the effect that the operating force during the opening / closing operation can be controlled with a simple structure without using the operating device having the special output characteristic or the large output according to the first aspect of the invention, the operating direction of the operating member and the operating device are also provided. The operating force during the opening / closing operation can be easily controlled even when the driving directions of the are different.

According to the third invention described in claim 3,
In addition to the effect of the first aspect of the invention, since the operation force at the initial stage of opening the contact is increased by the energy storing means, the trip speed of the operating rod at the opening can be further increased.

According to the fourth invention described in claim 4,
In addition to the effect of the third aspect of the invention, the energy accumulating means can be realized with a simple structure using the auxiliary lever, the plunger member and the spring.

According to the fifth invention described in claim 5,
In addition to the effect of the third invention, the energy storage means can be realized with a simpler configuration.

According to the sixth invention described in claim 6,
In addition to the effect of the fourth or fifth aspect of the invention, it is possible to configure the energy accumulating means with improved reliability without applying an extra force to the operating member during closing.

According to the seventh invention described in claim 7,
Since the operation force in the initial stage of opening is increased by the energy storage means, it is possible to provide a switch with an increased trip speed during opening.

According to the eighth invention described in claim 8,
It is possible to provide a circuit breaker in which a lightweight material can be used for a member forming the link means.

According to the ninth invention described in claim 9,
When applied to a puffer type circuit breaker, it is possible to improve the withstand voltage characteristic (advance small current interruption performance) against the transient recovery voltage immediately after the current interruption.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a state when a circuit breaker according to a first embodiment is closed.

FIG. 2 is a cross-sectional view of essential parts showing a state during a contact opening operation of the circuit breaker shown in FIG.

FIG. 3 is a cross-sectional view of an essential part showing an opened state of the circuit breaker shown in FIG.

FIG. 4 is a configuration diagram schematically showing energy storage means when the circuit breaker according to the second embodiment is closed.

FIG. 5 is a configuration diagram showing a state when the energy storage means shown in FIG. 4 is released.

FIG. 6 is a configuration diagram showing a closed state of a link mechanism of a circuit breaker according to a third embodiment.

7 is a configuration diagram showing a configuration during a contact opening operation of the link mechanism of the circuit breaker shown in FIG.

FIG. 8 is a main part configuration diagram showing a link mechanism of a circuit breaker according to a fourth embodiment.

FIG. 9 is a cross-sectional view of essential parts showing a closed state of a conventional circuit breaker.

FIG. 10 is a cross-sectional view of an essential part showing an opened state of the conventional circuit breaker of FIG. 9.

[Explanation of symbols]

1 fixed contact (main fixed contact), 2 movable contact (main movable contact), 3 operating device,
7 Fourth Link Member, 13 Operation Member (Operation Rod), 14 Third Link Member, 19a Engaging Means (Engaging Part), 19b Engaging Means (Pin with Hole), 2
0 guide link, 21, 22, 31 support shaft, 23
1st lever, 24 2nd lever, 25 1st link member, 26 2nd link member, 27 connection part (pin), 32 auxiliary lever, 33 plunger member, 33a flange part, 33b guide part,
35 spring members, 46 link members, 51 energy storage means, 100 link means.

Claims (9)

[Claims] 1. A movable contact provided so as to be able to come into contact with and separate from a fixed contact, an operating member for bringing the movable contact into and out of motion, and the operating member provided by being connected to the operating member by link means. In a circuit breaker including a driving operation device, the link means includes a first link member interposed between the operation member and the operation device and connected to the operation member side, and the first link member. A second link member that is rotatably connected to the member and is connected to the operating device side; and one side is rotatably connected to the connecting parts of the first link member and the second link member and the other side. And a guide link pivotally supported by the fixed portion. 2. The link means includes a third link member interposed between the operation member and the first link member, and one side portion pivotally supported by a support shaft provided in the fixed portion and the other side portion. Is the first
The first lever connected to the connecting portion of the third link member and the fourth link member interposed between the operating device and the second link member, and one side of the support member is the above-mentioned support. The second link member and the fourth link member are pivotally supported by the shaft and the other side portion is the second link member and the fourth link member.
The circuit breaker according to claim 1, further comprising a second lever connected to the connecting portion of the link member. 3. The link means is provided with an engaging means at a predetermined portion, and is stored with energy through the engaging means of the link means by the driving force of the operating device during the closing operation, and in the initial process of the opening operation. The circuit breaker according to claim 1 or 2, further comprising a power storage means for discharging the stored energy. 4. The energy accumulating means is engaged with an auxiliary lever rotatably provided on a fixed portion, and an engaging means engaged with the auxiliary lever so as to be able to move in and out, and one end portion of which is provided on the link means. And a spring member for urging the plunger member toward the engaging means, and stores the spring member through the engaging means and the plunger member during the closing operation. 4. The circuit breaker according to claim 3, wherein the speed of the link means in the opening direction is increased by the stored spring member in the initial stage of the opening operation. 5. The plunger member has a flange portion and a guide portion axially protruding from the flange portion, and the engaging means is rotatably provided on the link means. 5. A pin with a hole having a through hole through which the guide portion of the member is inserted.
Circuit breaker described. 6. The method according to claim 4, wherein in the closed state, the plunger member is pressed against the engaging means at an angle of 70 ° to 110 ° with respect to the movable direction of the engaging means. The circuit breaker according to claim 5. 7. A movable contact that can be brought into contact with and separated from a fixed contact, an operating member that brings the movable contact into and out of contact with the fixed contact, and the operating member provided by being connected to the operating member by link means. In a circuit breaker provided with an operating device to be driven, the link means is provided with an engaging means at a predetermined portion, and the driving force of the operating device during the closing operation stores energy through the engaging means of the link means. And a circuit breaker comprising energy storage means for discharging the stored energy in the initial stage of the opening operation. 8. A movable contact provided so as to be able to come into contact with and separate from a fixed contact, an operating member for bringing the movable contact into and out of contact, and the operating member provided by being connected to the operating member by link means. In a circuit breaker having an operating device for driving, the link means includes a first lever pivotally supported by a fixed portion, a second lever pivotally supported by the fixed portion, and the first and second levers. And a link member connecting the first lever to the operating member side, and connecting the second lever to the operating device side. vessel. 9. An arc-extinguishing gas is compressed in accordance with the opening / closing operation of a pair of a fixed arc movable contact and a movable arc contact that can be separated and separated, and a main movable contact coaxially provided outside the movable arc contact. The circuit breaker according to claim 1, further comprising a puffer cylinder.