KR20080026613A - Breaker - Google Patents

Abstract

A breaker having a shaft (9), an operation arm (7), and an electromagnetic operation means (10). The shaft (9) is provided pivotable about an axis (91). The operation arm (7) is pivotally connected by a first connection section to the shaft (9) with a first predetermined distance ra vertically away from the axis (91) and is connected to a movable member by a second connection section. The electromagnetic operation means (10) has a drive shaft (16) that is connected to the shaft (9) by a third connection section provided at a circumferentially different position of the shaft (9) from the first connection section and is driven so as to move on a straight line perpendicularly crossing the axis (91) with a second predetermined distance rb from the axis (91). The electromagnetic operation means (10) is urged to drive a drive shaft (16), which rotates the shaft (9) to drive the movable member via the operation arm (7). An operation mechanism section is simplified and downsized, and controllability and reliability of the breaker are improved. ® KIPO & WIPO 2008

Description

Breaker {BREAKER}

The present invention relates to a circuit breaker having a fixed contact and a movable contact, and having an electronic operating mechanism for inserting or removing the movable contact with respect to the fixed contact.

Conventional low voltage circuit breakers are mainstream spring-loaded circuit breakers that use the energy released when the accumulated springs are opened to perform the operation of inserting or disconnecting the movable contact. (See Patent Document 1, for example.)

On the other hand, a circuit breaker has also emerged in which a movable contact of a vacuum switch is input or separated by using an electronic operation mechanism (see Patent Document 2, for example).

Patent Document 1: Japanese Patent Application Laid-Open No. 6-89650 (Figures 1-5, page 2)

Patent Document 2: EP1214727B1 Publication (Figs. 1 to 2 and 2 to 5 pages)

Disclosure of the Invention

Problems to be Solved by the Invention

The low voltage circuit breaker shown in Patent Literature 1 uses a large number of latches and links in the operation mechanism, which leads to an increase in the size of the device, and also the maintenance of the device at regular intervals in order to compensate for the device reliability due to the large number of parts. Needed.

Moreover, the circuit breaker shown in patent document 2 also has a long link provided between the operation shaft which performs the operation | movement contact | operation of a movable contact and a fixed contact, and the drive shaft of an electronic control mechanism, and still improves the reliability of an apparatus, and miniaturization. This is necessary. Moreover, although the circuit breaker shown by patent document 2 is equipped with the U-shaped electric circuit for achieving the short-time electricity supply performance of a contact part, it is necessary to change the shape and dimension of each U-shaped electric circuit depending on a current capacity. The short-time conduction performance referred to herein is one of the performances required when the breaker is used as a weekly breaker, and the protection relay device operates during a large current supply such as a short circuit accident to perform a safe breaking operation. It is the performance of continuing to energize the short-circuit current for a while. In general, when a large current is energized, a large electromagnetic repulsion force is generated between the contacts and the movable contact may float, so that a structure that does not generate a floating contact such as a U-shaped electric circuit shown in Patent Document 2 is required. .

This invention is made | formed in order to solve the problem in such a conventional circuit breaker, and aims at obtaining the circuit breaker which aimed at simplifying and downsizing an operation mechanism, and improving controllability and reliability.

Means to solve the problem

The circuit breaker according to the present invention includes a fixed conductor having a fixed contact, a movable contact having a movable contact and driven to inject or detach the movable contact from the fixed contact, and a shaft provided to be rotatable around an axis. And an operating arm pivotally connected to the shaft by a first connecting portion at a first predetermined distance in a vertical direction with respect to the axis, and connected to the mover by a second connecting portion, and the shaft with respect to the first connecting portion. And an electronic operating means having a drive shaft connected to the shaft by a third connecting portion provided at a different circumferential direction of and moving on a straight line orthogonal to a second predetermined distance with respect to the shaft center. Press to drive the drive shaft to rotate the shaft to move the operating arm. It will hit one to drive the moving characters.

In the present invention, the first connection portion connecting the shaft and the operation arm is a connection portion for directly connecting the shaft and the operation arm, and a connection portion for indirectly connecting the shaft and the operation arm via another member. It includes both. Moreover, in this invention, the 2nd connection part which connects an operation arm and a mover is a connection part which directly connects the operation arm and the mover, and the connection which indirectly connects the operation arm and the mover via another member. In the case of denial, both sides are included.

Further, in the present invention, the third connecting portion connecting the shaft and the drive shaft is a connection portion for directly connecting the shaft and the drive shaft, and a connection portion for indirectly connecting the shaft and the drive shaft via another member. It includes both sides.

Effects of the Invention

According to the circuit breaker according to the present invention, an operation arm connected to a shaft by a first connecting portion at a first predetermined distance in a vertical direction with respect to an axis and rotatably connected to a mover by a second connecting portion, and said first connecting portion And an electronic operating means having a drive shaft connected to the shaft by a third connecting portion provided at a different position in the circumferential direction of the shaft with respect to the shaft center and driven to move on a straight line at a second predetermined distance with respect to the shaft center. By pressurizing the electronic control means to drive the drive shaft, the shaft is rotated to drive the mover through the operation arm, thereby simplifying and minimizing the operation mechanism and improving controllability and reliability of the circuit breaker. can do.

1 is a block diagram showing a circuit breaker according to a first embodiment of the invention;

2 is a configuration diagram of an essential part for explaining the operation of the circuit breaker according to the first embodiment of the present invention;

3 is a configuration diagram of an essential part for explaining the operation of the circuit breaker according to the first embodiment of the present invention;

4 is a graph for explaining the operation of the circuit breaker according to the first embodiment of the present invention;

5 is a configuration diagram of an essential part of a circuit breaker according to a second embodiment of the present invention;

6 is a configuration diagram of an essential part of a circuit breaker according to the third embodiment of the present invention;

7 is a configuration diagram of an essential part of a circuit breaker according to the fourth embodiment of the present invention;

8 is a configuration diagram of an essential part of a circuit breaker according to a fifth embodiment of the present invention;

9 is a configuration diagram of an essential part for explaining the operation of the circuit breaker according to the fifth embodiment of the present invention;

10 is a configuration diagram of an essential part of a circuit breaker according to a sixth embodiment of the present invention;

11 is a configuration diagram of an essential part of a circuit breaker according to a seventh embodiment of the present invention;

12 is a configuration diagram of an essential part of a circuit breaker according to the eighth embodiment of the present invention;

13 is a block diagram of a main part of a circuit breaker according to a ninth embodiment of the present invention;

Explanation of the sign

1: insulation case 101, 102: space part

103: insulation wall 21, 22: high conductor

211, 21la, 21lb, 211c: Fixed contact

3: mover 311, 311a, 311b, 311c: movable contact

4: link pin 5: contact spring

6: flexible conductor 7: operation arm

71, 161, 171, 172, 1611, 1612: connecting pin

8, 8a, 8b, 8c, 8d: connecting plate 81, 810, 820: connecting hole

811, 821: first hole 812, 822: second hole

9: shaft 91: shaft center

10: electronic control device 11: yoke

12: first coil 13: second coil

14 permanent magnet 15 movable core

16: drive shaft 17: connection link

801, 8011: stopper pin 802: pin support

1601: linkage shaft 1602: stopper lever

1613: support pins 171, 172: bearing

Best Mode for Carrying Out the Invention

Embodiment 1

1 is a configuration diagram showing a circuit breaker according to a first embodiment of the present invention, and FIGS. 2 and 3 are explanatory views for explaining the operation of the circuit breaker according to the first embodiment.

In FIG. 1, the insulating case 1 has space portions 101 and 110 defined by an insulating wall 103 therein, and a pair of high conductors 21 and 22 penetrating through the space portion 101 from the outside. ). The high conductors 21 and 22 are connected to the power supply side conductor and the load side conductor which are not shown, respectively. The high conductor 21 and the high conductor 22 are also called a power supply side terminal and a load side terminal, respectively. The fixed contact 211 is fixed to the end of the high conductor 21 exposed to the space 101 of the insulating case 1.

The movable element 3 is rotatably supported by the link pin 4, and the movable contact 311 is fixed to the position which opposes the stationary contact 211. As shown in FIG. The contact pressure spring 5 has the mover 3 as the center of the link pin 4 so as to impart contact pressure between both contacts when the movable contact 311 is inserted into the fixed contact 211. Pressurize in the direction to rotate clockwise. The movable element 3 and the high conductor 22 are electrically connected by the flexible conductor 6 which can be bent.

The plate-shaped connecting plate 8 provided in the space 102 of the insulating case 1 is fixed to the shaft 9 rotatably supported around the shaft core 91. The connecting plate 8 is provided with the long groove-shaped connecting hole 81 which inclined inward from the outer peripheral part. The operation arm 7 passes through the through hole 104 provided in the partition wall 103 of the insulating case 1, one end of which is connected to the mover 3 so as to be rotatable, and the other end of which is connected. It is connected to the connecting plate 8 by the pin 71 so that rotation is possible. The connection part of the connection board 8 by the connecting pin 71 and the other end of the operation arm 7 comprises a 1st connection part, and this 1st connection part is the 1st from the shaft center 91 of the shaft 9 from 1st. It is provided in the position of the radius r which is a predetermined distance. In the case of FIG. 1, since the axis 91 and the connecting pin 71 overlap on the y axis, the distance ra in the y axis direction of the first connecting portion with respect to the axis 91 is equal to the radius r. As described above, the distance ra in the y axis direction decreases depending on the rotation angles of the connecting plate 8 and the shaft 9. One end of the operation arm 7 and the connecting portion of the mover 3 constitute a second connecting portion.

The electronic operating mechanism 10 as the electronic operating means is provided in the space 102 of the insulating case 1, and has a yoke 11 formed of a magnetic body and a first coil 12 fixed inside the yoke 11. ) And the second coil 13, the permanent magnet 14 fixed between the first coil 12 and the second coil 13, the first coil 12 and the second coil 13, and the permanent The inside of the magnet 14 is fixed to the movable iron core 15 movable in the direction of the y axis in FIG. 1 and the movable iron core 15, and reciprocates on a straight line in the y axis direction as the movable iron core 15 moves. The drive shaft 16 which moves is provided.

The electronic operating mechanism 10 needs to maintain the state of input and detachment of the movable contact 311, and is composed of a bistable structure. In FIG. 1, the movable iron core 15 is attracted to the upper portion of FIG. 1 of the yoke 11 by the magnetic force of the permanent magnet 14 and is stable. However, when the coil 13 is pressed, the coil 13 is generated. By the action of the magnetic flux, the movable iron core 15 is driven downward in FIG. 1 to contact the lower portion of the yoke 11. At this time, the current is interrupted to the coil 13, but the movable iron core 15 is stabilized while being adsorbed to the lower side of the yoke 11 by the magnetic force of the permanent magnet 14. Next, when the coil 12 in this state is pressurized, the movable iron core 15 is driven to the upper part of FIG. 1 by the magnetic force of the coil 12, and as shown in FIG. 1, the upper part of the yoke 11 is shown. Is adsorbed on. At this time, the coil 13 is interrupted in current, but is stabilized while being sucked under the yoke 11 by the magnetic force of the permanent magnet 14.

The drive shaft 16 is connected to the connecting plate 8 by a connecting pin 161 inserted into the connecting hole 81 of the connecting plate 8. The connecting portion by the connecting pin 161 and the connecting hole 81 constitutes the third connecting portion. The drive shaft 16 moves on a straight line in the y axis direction orthogonal to the axis center 91 via the distance rb. This distance rb is corresponded to a 2nd predetermined distance. The connecting plate 8 is rotated around the shaft center 91 at the same time as the shaft 9, but since the connecting hole 81 is formed in a shape inclined inward from the outer peripheral portion of the connecting plate 8, the connecting plate 8 Even if (8) rotates, the connecting pin 161 engages with the connecting hole 81 while always keeping the distance rb in the x axis direction between the shaft center 91 constant.

FIG. 1 shows a state in which the intermittent point 311 is separated from the fixed contact 211. When the coil 13 of the electronic operating mechanism 10 is pressed in this state, the movable iron core 15 is shown in FIG. The drive shaft 16 driven below 1 and fixed to the movable iron core 15 moves downward on the y axis. As the drive shaft 16 moves downward on the y axis, the connecting plate 8 connected to the drive shaft 16 is driven through a third connecting portion consisting of the connecting pin 161 and the connecting hole 81 to be rotated counterclockwise. do. By rotating the connecting plate 8 counterclockwise, the operation arm 7 connected to the connecting plate 8 by the connecting pin 71 is driven in the right direction on the x-axis to guide the mover 3. Drive in the right direction of 1.

FIG. 2 shows the state of the initial stage at which the movable contact 311 starts contacting the fixed contact 211 by driving the mover 3 in the right direction of FIG. 1. During this closing operation, the contact pressure is applied between the fixed contact 211 and the movable contact 311 by the action of the contact spring 5, and the load force Fa in the direction of the arrow is generated on the operation arm 3. . On the other hand, in the drive shaft 16 of the electronic operating mechanism 10, the operating force Fb based on the suction force acting on the movable iron core 15 is generated in the direction of the arrow. Therefore, the rotation moment acting on the shaft 9 fixing the connecting plate 8 includes the load moment Ma (= Fa.ra) and the shaft 9 to rotate the shaft 9 clockwise. ) Is the operating moment Mb (= Fb · rb) to be rotated counterclockwise.

here,

Ma = Fara

Mb = Fb · rb, and in order to rotate the shaft 9 and the connecting plate 8 counterclockwise, a relationship of Mb> Ma is required.

When the operating moment Mb exceeding the load moment Ma is applied to the connecting plate 8, the connecting plate 8 is rotated more counterclockwise from the position in FIG. 2, and the movable contact shown in FIG. 3. A position of completion of the input of 311 is reached. In this closing state, the shaft center 91 of the shaft 9, the center of the connecting pin 71 and the center of the link pin 4 are located in a straight line, and the drive shaft 16, the connecting plate 8, and the shaft are aligned. (9), the operation arm 7 and the mover 3 stop at the position, and the injection of the movable contact 311 into the fixed contact 211 continues.

As described above, the distance ra in the y-axis direction between the shaft center 91 and the connecting pin 71 is the maximum at the position shown in FIG. 1, but decreases depending on the rotation angle of the connecting plate 8. On the other hand, the distance rb in the x-axis direction between the connecting pin 161 and the shaft center 91 is always constant. Therefore, when the load moment Ma makes the load force Fa by the contact spring 5 constant, it decreases depending on the rotation angle of the connecting plate 8 starting from the position of FIG. On the other hand, since the distance rb is constant even if the connecting plate 8 rotates, the operation moment Mb changes depending only on the driving force Fb of the electronic operating mechanism 10.

The relationship between the load force Fa and the load moment Ma which act on the connecting plate 8 by the contact spring 5 is shown in FIG. In FIG. 4, the horizontal axis represents the stroke [mm] of the operation arm 7, and the vertical axis represents the force [N]. In the stroke lock t1 of the operation arm 7, the load force Fa by the contact spring 5 rises, and then the operation arm 7 passes from the position shown in FIG. 1 past the position shown in FIG. The load force Fa increases linearly as shown by the solid line in FIG. 4, corresponding to the increase in the stroke until the closing position of the movable contact 311 shown in FIG. 3 is reached. On the other hand, since the connecting plate 8 and the shaft 9 rotate in response to the operation arm 7 moving from the position in FIG. 1 to the position in FIG. 3, the shaft core 91 and the connecting pin ( The distance ra in the y axis direction of 71 decreases depending on the rotation angle of the connecting plate 8 and the shaft 9. As a result, the load moment Ma acting on the connecting plate 8 and the shaft 9 is changed as shown by the broken line in FIG. 4, and is almost the minimum at the closing position of the movable contact 311 in FIG. 3. Becomes The stroke of the operation arm 7 at this closing position is represented by t2 in FIG.

In order to insert the movable contact 311 into the fixed contact 211 and to maintain the closing state shown in FIG. 3, it is necessary to continuously apply the operating moment Mb of the load moment Ma or more to the connecting plate 8. As described above, since the load moment Ma decreases depending on the rotation angle of the connecting plate 8 and becomes the minimum in the loading completion state, the operation moment Mb for maintaining the loading completion is the load moment at the minimum. (Ma) or more may be sufficient, and the completion | finish input state can be maintained by the adsorption force of the movable core 15 by the permanent magnet 14 of the comparatively small electronic operating mechanism 10. FIG.

Next, an operation in the case of separating the movable contact 311 from the closing state shown in FIG. 3 will be described. When in the closing state of FIG. 3, the movable iron core 15 of the electronic operating mechanism 10 is attracted to the position opposite to the position shown in FIG. 1, that is, the lower side of FIG. 1 of the yoke 11 and is stable. have. At this time, when the coil 12 is pressurized, the movable iron core 15 is attracted to the upper part of FIG. 1 by the action of the magnetic flux generated by the coil 12, and the operating force Fb in the opposite direction to the direction shown in FIG. Occurs on the operation arm 16. By the operation moment Mb (= Fb * rb) based on this operation force Fb, the connecting plate 8 starts to rotate clockwise around the axial center 91 of the shaft 9.

In the closing state shown in FIG. 3, the shaft core 91, the connecting pin 71 and the link pin 4 are aligned and stopped in a straight line, but the alignment is performed by the clockwise rotation of the connecting plate 8. This collapses and the operation arm 7 moves from the stroke t2 of FIG. 4 to the direction of the stroke t1. At this time, depending on the rotation angle of the connecting plate 8 that rotates in the clockwise direction, the distance ra in the y-axis direction between the shaft core 91 and the connecting pin 71 increases, and therefore, as shown in FIG. Similarly, the load moment Ma increases rapidly. As a result, the connecting plate 8 receives a large load moment Ma and rapidly rotates clockwise, and the operation arm 7 separates the movable contact 311 of the mover 3 from the fixed contact 211. 1 and it is in the separated state shown in FIG. 1, and is stable.

When the external circuit (not shown) connected between the fixed conductors 21 and 22 is energized in the closing state shown in FIG. 3, for example, a short circuit accident or the like occurs, the fixed contact 211 and the movable contact A large electron repulsion force is generated due to a large current between 311, but as shown in FIG. 3, the center of the shaft 9 of the shaft 9 and the center of the connecting pin 71 and the link pin 71 are in the state of completion of insertion. Since the center of (4) is located in a straight line, the load moment to rotate the connecting plate 8 clockwise by the electromagnetic repulsive force is reduced so that the connecting plate 8 does not rotate, and the movable contact 311 There is no separation from the fixed contact 211. Therefore, even if this breaker is used as a weekly breaker, a short-time energization performance can be achieved.

As described above, according to the circuit breaker according to the first embodiment of the present invention, it is not necessary to reduce the load force by the link ratio by using a plurality of links in order to reduce the driving force required for the electronic operation mechanism as in the conventional apparatus. In addition, the operating mechanism can be easily and compactly sized, and the controllability and reliability of the circuit breaker can be improved, and operation without maintenance can be achieved.

Embodiment 2

5 is a configuration diagram of an essential part of the circuit breaker according to the second embodiment of the present invention. In FIG. 5, the connecting link 17 is rotatably connected by the drive shaft 16, the connecting plate 8, and the connecting pins 171, 172 of the electronic operating mechanism 10, respectively. The connection between the drive shaft 16 and the connecting plate 8 by the connecting link 17 constitutes a third connecting portion, and the connecting hole 81 and the connecting pin 81 of the connecting plate 8 in the first embodiment It corresponds to the 3rd connection part by 161, and connects the drive shaft 16 and the connection plate 8, maintaining the movement on the straight line of the drive shaft l6 in the up-down direction (y-axis direction) in FIG. It is.

The rest of the configuration is similar to that of the breaker according to the first embodiment.

According to the circuit breaker according to the second embodiment, the manufacture is easy without the need for providing connection holes.

Embodiment 3

It is a block diagram of the principal part of the circuit breaker which concerns on Example 3 of this invention. In FIG. 6, the stopper pin 801 is fixed to the connecting plate 8. When the connecting plate 8 is rotated to the closing position (position shown in FIG. 6), the pin supporting portion 802 engages with the stopper pin 801 to stop the connecting plate 8, thereby The shaft core 91, the connecting pin 71 and the link pin 4 are positioned in a straight line to maintain the state.

The rest of the configuration is the same as that of the first embodiment.

According to the circuit breaker according to the third embodiment, stable operation performance can be obtained by preventing contact wear due to prolonged use, positional shift in the closing state due to disassembly of the assembly, and the like.

Embodiment 4

It is a block diagram of the principal part of the circuit breaker which concerns on Example 4 of this invention. In FIG. 7, one end of the interlocking shaft 1601 is rotatably connected to the drive shaft 16 of the electronic operating mechanism 10 by a connecting pin 1611. One end of the stopper lever 1602 is rotatably supported by the support pin 1613, and a center portion thereof is rotatably connected to the other end of the interlocking shaft 1601 by the connecting pin 1612. A stopper pin 801 is fixed to the other end of the stopper link 1602. The stopper pin 8011 engages with insertion of the wedge into the notch portion (not shown) of the connecting plate 8 after completion of the closing operation of the breaker as shown in FIG. The positions of the connecting plate 8 and the shaft 9 are maintained to prevent rotation of the connecting plate 8 in the clockwise and counterclockwise directions.

When the circuit breaker is to be separated and operated, the drive shaft 16 is driven upward in FIG. 7 by giving an electronic operating mechanism separation command. As a result, the stopper lever 1602 connected to the drive shaft 16 via the interlocking shaft 1601 is rotated counterclockwise around the support pin 1613, so that the stopper pin 8011 and the connecting plate 8 are rotated. Engagement with the notch part is released, and the connecting plate 8 is rotated in the clockwise direction, and the separating operation of the movable contact 311 is performed.

In the third embodiment, the stopper pin 801 was mainly designed to prevent the connecting plate 8 and the shaft 9 from further rotating in the counterclockwise direction after the closing position. , The stopper pin 801 prevents the connecting plate 8 from being rotated in any of the clockwise and counterclockwise directions when the closing is completed, so as to maintain the rotation angle of the connecting plate 8 completely when the closing is completed. It is installed as.

In Example 4, as shown in FIG. 7, the shaft center of the shaft 9, the connection pin 71, and the link pin 4 after completion | finish of insertion is not aligned in a straight line, but the shaft center 91 of the shaft 9 ), The connecting pin 71 is located in a clockwise direction than the link pin 4. Therefore, a large rotational force in the clockwise direction acts on the connecting plate 8 due to the large electromagnetic repulsion force generated when a large current flows between the contacts due to a short circuit or the like, but the stopper pin 8011 engaged with the notch portion of the connecting plate 8. Rotation of the connecting plate 8 and the shaft 9 is prevented, and short-time conduction performance is achieved. The rest of the configuration is the same as in the first embodiment.

In addition, although the drive shaft 16 and the stopper pin 8011 are mechanically interlocked in FIG. 7 using the interlocking shaft 1601 and the stopper lever 1602, the operation of the electronic operating mechanism 10 and the stopper pin 8011 May be interlocked by other means, such as by electrically interlocking the operations.

Embodiment 5

8 and 9 are configuration diagrams of main parts of the circuit breaker according to the fifth embodiment of the present invention. FIG. 8 shows a separation completion state and FIG. 9 shows a closing state. As shown in FIGS. 8 and 9, the connecting hole 810 provided in the connecting plate 8 includes a first hole 811 and a second hole 812 that are bent and connected in an L shape. . In the separation completion state shown in FIG. 8, the connecting pin 161 provided in the drive shaft 16 is inserted into the second hole of the connection hole 810, but in the closing state shown in FIG. 9, the connection pin 161 is provided. Is inserted into the first hole 811 of the connecting hole 810.

Other configurations are the same as those in the first embodiment.

In the closing state of the movable contact 311, as shown in FIG. 9 by the load force Fa acting on the operation arm 7, the load component force () is applied to the connecting pin 161 via the connecting plate 8. Fb2) acts in the direction of the arrow. If the contact surface of the first hole 811 of the connecting hole 810 engaging with the connecting pin 161 is parallel to the moving direction of the drive shaft 16, the load component Fb2 is only the horizontal component of FIG. In the vertical direction of FIG. 9, that is, in the moving direction of the drive shaft 16 of the electronic operating mechanism 10, the load component is hardly generated except for the microcomponents caused by the production gap. Therefore, a large holding force is not required for the electronic operating mechanism 10 to maintain the closing state, and the closing state can be maintained without increasing the size of the electronic operating mechanism 10.

Embodiment 6

It is a block diagram of the principal part of the circuit breaker concerning Example 6 of this invention. In the sixth embodiment, as shown in FIG. 10, the connection hole 820 includes a first hole portion 821 and a second hole portion 822 which are bent and connected at an angle of about 120 degrees. In the closing state of the movable contact, the connecting pin 161 provided on the drive shaft (not shown) engages with the inclined wall portion of the second hole 822 of the connecting hole 820.

Fig. 10 shows the engaged state of the connecting pin 161 and the connecting hole 820 in the closing state, and has the same load force Fa as the load force Fa shown in Fig. 9 acting on the operation arm (Fig. Load component Fb3 acts in the direction of the arrow on the connecting pin 161, but as shown in FIG. 10, if the directions of the x-axis and the y-axis are defined, the load in the same direction as the movement direction of the drive shaft The component force Fb3y is generated in the direction of the arrow and acts on the drive shaft of the electronic operating mechanism. On the other hand, the frictional force Fc by engagement with the wall of the connecting pin 161 and the second hole 822 acts along the wall of the second hole 822, so that the component force in the y-axis direction is moved by the drive shaft. It acts as a frictional component Fcy in the direction.

here,

Fcy = μFb3

Where μ is the coefficient of friction.

This frictional component Fcy is reverse to the load component Fb3y, and cancels the load component Fb3y which wants to move a drive shaft to a separation direction via the connecting pin 161. As shown in FIG. Since frictional force Fc is proportional to the friction coefficient (mu) of the side surface of the 2nd hole part 822 of the connection hole 820, great friction is at least in the wall part of the at least 2nd hole part 822 of the connection hole 820. By arranging a high friction member having a coefficient and actively applying the friction force Fc to the connecting pin 161, a large friction component Fcy that maintains the closing state of the circuit breaker is generated, which causes the high-current energization. The repulsive force characteristic can be improved.

In addition, the other structure is the same as that of Example 1. FIG.

Embodiment 7

11 is a configuration diagram of an essential part of a circuit breaker according to a seventh embodiment of the present invention.

When the above-mentioned load force Fa acts on the connecting pin 161 in the closing state of the breaker, the load component in the direction parallel to the moving direction of the drive shaft 16 (y axis direction) and the direction perpendicular to this The load component in the (x-axis direction) acts on the drive shaft 16, and the drive shaft 16 may deform under the influence of the load component in the vertical direction (x direction).

Therefore, in Example 7 shown in FIG. 11, the drive shaft 16 of the electronic operating mechanism 10 is lengthened, and this drive shaft 16 is connected to the pair of bearings 171 and 172 on both sides of the connecting plate 8. It is supported by. The connecting pin 161 is provided in the drive shaft 16 between these bearings 171 and 172, and is inserted in the connecting hole 810 of the connecting plate 8. As shown in FIG.

According to the seventh embodiment, since the drive shaft 16 is supported by the pair of bearings 171 and 172, the deformation of the drive shaft 7 can be prevented and the electromagnetic resistance characteristics at the time of high current energization can be improved. Can be.

Embodiment 8

In general, low-voltage circuit breakers are generally applied to three-phase circuits, and three-phase circuit breakers having fixed and movable contacts corresponding to each phase of three phases are widely used. In the case of this three-phase circuit breaker, as a method of operation by the electronic operating mechanism, the three-phase collective input and separation operation may be performed, or each phase may be separately input and separate operation.

12 shows the configuration of main parts of the three-phase circuit breaker according to the eighth embodiment of the present invention, in which each phase is collectively operated by one electronic operating mechanism 10. In Fig. 12, the shaft 9 fixes three connecting plates 8a, 8b and 8c of the same structure. These connecting plates 8a, 8b and 8c are connected to the movable contacts 311a, 311b and 311c, respectively. The connection of each connecting plate 8a, 8b, 8c, and movable contact 311a, 311b, 311c is comprised like any one of Examples 1-7. The movable contacts 311a, 311b and 311c are fed or separated with respect to the fixed contacts 21la, 21lb and 211c respectively connected to the conductors of each of the three phases.

The drive shaft 16 of the electronic operating mechanism 10 is connected to one connecting plate 8b, and the connecting plate 8b is driven to rotate the shaft 9 to carry out a three-phase collective loading or separating operation. do. The connection of the connecting plate 8b and the drive shaft 16 is comprised like any one of Examples 1-7. According to this eighth embodiment, a three-phase circuit breaker having the same effects as any of the first to seventh embodiments can be obtained.

Embodiment 9

Fig. 13 shows the structure of the main part of the circuit breaker according to the ninth embodiment of the present invention, and a connecting plate 8d for connecting to the drive shaft 16 of the electronic operating mechanism 10 is separately provided. The rest of the configuration is the same as in the eighth embodiment.

According to the ninth embodiment, the connecting plates 8a, 8b, 8c for connecting the movable contacts 311a, 311b, and 311c and the connecting plates 8d for connecting the drive shaft 16 are arranged at different angles. ), The optimum configuration for each connection can be achieved.

In each of the above-described Examples 1 to 9, although a normal movable contact and a fixed contact were used, it is a matter of course that these contacts may be constituted by a vacuum valve.

The circuit breaker which concerns on this invention can be used as a circuit breaker which opens and closes a low voltage distribution line.

Claims (9)

 A fixed conductor having a stationary contact, a mover having a movable contact and driven to insert or detach the movable contact with respect to the fixed contact, a shaft rotatably provided around the axis, and perpendicular to the axis 1 is provided at a different position in the circumferential direction of the shaft with respect to the first connecting portion and an operation arm which is rotatably connected to the shaft by a first connecting portion at a predetermined distance and connected by a second connecting portion to the mover; And an electronic operating means having a drive shaft connected to the shaft by a connecting portion, the drive shaft being driven to move on a straight line orthogonal to the shaft center at a second predetermined distance, and by pressing the electronic operating means to drive the drive shaft. Rotating the shaft to drive the mover through the operating arm. Characterized in that the breaker. The method of claim 1, When the input of the fixed contact and the movable contact is completed, the shaft center of the shaft and the first connecting portion and the second connecting portion is configured to be aligned almost in a straight line breaker. The method of claim 2, When the said input is completed, the stopper means which maintains the shaft center of the said shaft, said 1st connection part, and said 2nd connection part in the said straight line was provided, It is characterized by the above-mentioned. breaker. The method of claim 3, wherein When the movable contact is separated from the fixed contact, the holding by the stopper means is released. breaker. The method of claim 1, The mover operation arm and the drive shaft are connected to the shaft via a connecting member fixed to the shaft. breaker. The method of claim 5, wherein The connecting member is composed of a plate-shaped member, wherein the third connecting portion, characterized in that formed by the connecting hole provided in the connecting member and the drive shaft provided in the drive shaft to be slidably inserted into the connecting hole. breaker. The method of claim 6, The connection hole has a bent portion having an inner wall extending in parallel with the driving direction of the drive shaft when the fixed contact and the movable contact are completed, and the connection pin is connected to the bent portion when the closing is completed. In contact with the inner wall breaker. The method of claim 7, wherein A high friction member having a friction coefficient larger than that of the inner wall is provided on the inner wall of the bent portion of the connection hole. breaker. The method according to any one of claims 6 to 8, The drive shaft is supported by a bearing on both sides of the position where the connecting pin is provided. breaker.

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