CN111554541B - Vacuum circuit breaker - Google Patents

Abstract

The invention discloses a vacuum circuit breaker, comprising an insulating casing, a vacuum arc-extinguishing chamber is opened in the insulating casing, a static contact is fixedly connected to one end of the vacuum arc-extinguishing chamber, and the other end of the vacuum chamber is A moving contact matched with the static contact is slidably connected, a first permanent magnet block is fixedly installed on the side of the moving contact away from the static contact through a support rod, and at least two permanent magnet blocks are arranged on the insulating shell The push assemblies are respectively located on both sides of the first permanent magnet block, and the end of the insulating shell away from the static contact is also slidably connected to the push plate connected to the external spring energy storage device. When in use, the external spring energy storage device can be used. Drive the movement of the push assembly, and further control the position of the moving contact through the repulsion between the permanent magnets, which can realize the action of the vacuum circuit breaker without contacting the moving contact. Power supply or air pump, safety and reliability are better.

Description

a vacuum circuit breaker

technical field

The invention relates to the technical field of vacuum circuit breakers, in particular to a vacuum circuit breaker.

Background technique

Vacuum circuit breaker is a switchgear that uses vacuum as the arc extinguishing medium and insulating medium, which can close, carry and break the normal current of the running circuit, and can also close, carry and break the specified overload current at the specified time. When the line or equipment fails, the faulty part is quickly removed from the power grid to ensure the normal movement of the fault-free part of the power grid.

The current vacuum circuit breaker is mostly driven by a spring energy storage device, a pneumatic device and an electromagnetic drive device. The pneumatic device and the electromagnetic drive are not in direct contact with the moving contact, so their safety is high, but Its limitations are relatively large, and the corresponding power supply or air pump needs to be deployed during use. It is easily affected by external factors during operation, and is prone to failure. For the spring energy storage device to drive the vacuum circuit breaker, it is related to the moving contact. Direct contact, in the long-term use process, the aging of the equipment is prone to leakage problems, there are certain safety hazards, and it does not meet the needs of high current reliability and portability.

SUMMARY OF THE INVENTION

Therefore, the present invention provides a vacuum circuit breaker to solve the problem that in the prior art, the normal operation of the vacuum circuit breaker is realized by a pneumatic device or an electromagnetic drive method, and the vacuum circuit breaker cannot respond in time due to external factors. It is easy to cause leakage problems due to equipment aging when it is used for a long time.

In order to achieve the above object, the present invention provides the following technical solutions:

A vacuum circuit breaker comprises an insulating casing, a vacuum arc-extinguishing chamber is opened in the insulating casing, a static contact is fixedly connected to one end of the vacuum arc-extinguishing chamber, and the other end of the vacuum arc-extinguishing chamber is slidably connected There are moving contacts that match the static contacts;

A first permanent magnet block is fixedly installed on the side of the movable contact away from the static contact through a support rod, and at least two pushers for repelling the first permanent magnet block are arranged on the insulating shell The push assembly is surrounded by the outer side of the first permanent magnet block; and the end of the insulating shell away from the static contact is also slidably connected with a push plate connected to the external spring energy storage device, so The push plate is connected to each push assembly through at least two fixing rods, and is used to push the push assembly to be close to or away from the first permanent magnet block, and to drive the movable contact away from or close to the static contact.

As a preferred solution of the present invention, the push assembly includes a limit assembly for limiting the first permanent magnet block, and a control shaft rotatably connected to the fixed rod through a torsion spring. One side is provided with a push rod fixedly connected with the control shaft; one end of the push rod is fixedly connected with a second permanent magnet block matched with the first permanent magnet block, and the other end of the push rod slides through a spring A limit shaft is connected, and a control board connected with the limit shaft is arranged on the insulating casing, and the control board is used to push the second permanent magnet block to rotate with the control shaft as the rotation center.

As a preferred solution of the present invention, the magnetic poles of the first permanent magnet block and the second permanent magnet block are opposite.

As a preferred solution of the present invention, the control board includes a guide groove that is fitted and connected with the limit shaft, and a plurality of rollers are provided on the side wall of the guide groove.

As a preferred solution of the present invention, the maximum rotation angle at which the second permanent magnet block rotates with the control shaft as the rotation center is 90 degrees.

As a preferred solution of the present invention, an inclined chute is provided on the side of the control board away from the limit shaft, and the limit shaft passes over the control board through the chute when moving toward the control board.

As a preferred solution of the present invention, a limit bar is slidably connected to the insulating casing through a spring, the limit bar is located on the side of the control shaft away from the control board, and the control shaft is facing the limit. A limit slot is set on one side of the position bar, and when the second permanent magnet block rotates 90 degrees with the control shaft as the rotation center, the limit slot is fitted with the limit bar.

As a preferred solution of the present invention, the limit assembly includes a limit block that is slidably connected to the insulating housing through a spring, the limit block is provided with a first push block in a trapezoidal structure, and the limit block is provided with a first push block in a trapezoidal structure. The push plate is provided with a second push block which matches with the first push block and is used for receiving the first push block into the insulating housing.

As a preferred solution of the present invention, the static contact includes an electrical connection block connected to an external circuit, and a static contact piece for contacting with the static contact is slidably connected to the electrical connection block through a spring, And the length range of the limit bar is between the minimum movement distance and the maximum movement distance of the contact between the static contact and the movable contact.

As a preferred solution of the present invention, there are at least two limit components, and the value range of the distance between the limit components is the smallest when the static contact and the movable contact are in contact. between the movement distance and the maximum movement distance.

The present invention has the following advantages:

When the present invention is in use, the movement of the push assembly can be driven by the external spring energy storage device, and the position of the moving contact can be controlled by the repulsion between the permanent magnets. Realize the action of vacuum circuit breaker; when using, there is no need to deploy additional power supply or air pump, and the safety and reliability are better.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be derived from the provided drawings without any creative effort.

The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention, so there is no technical The substantive meaning, any modification of the structure, the change of the proportional relationship or the adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the technical content disclosed in the present invention. within the scope of coverage.

1 is a schematic diagram of the overall structure of an embodiment of the present invention;

2 is a schematic structural diagram of a push assembly in an embodiment of the present invention;

3 is a schematic structural diagram of a control shaft in an embodiment of the present invention;

4 is a schematic structural diagram of a push plate in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a limit block in an embodiment of the present invention

FIG. 6 is an enlarged view of a part of the structure at A in FIG. 1 .

In the picture:

1-Insulation shell; 2-Vacuum interrupter; 3-Static contact; 4-Moving contact; 5-First permanent magnet block; 6-Push assembly; 7-Push plate; 8-Fixed rod; 9-Limit Position component; 10-limit bar; 11-limit slot;

301-connection block; 302-static contact piece;

601-Control shaft; 602-Push rod; 603-Second permanent magnet block; 604-Limit shaft; 605-Control plate; 606-Guide groove; 607-Roller; 608-Chute;

901-limiting block; 902-first pushing block; 903-second pushing block.

Detailed ways

The following specific embodiments are used to illustrate the embodiments of the present invention. Those who are familiar with the technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention. , not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIGS. 1 to 5 , the present invention provides a vacuum circuit breaker, comprising an insulating casing 1 , a vacuum arc extinguishing chamber 2 is opened in the insulating casing 1 , and a static contactor is fixedly connected to one end of the vacuum arc extinguishing chamber 2 Head 3, the other end of the vacuum chamber is slidably connected with a moving contact 4 matching the static contact 3.

The static contact 3 and the moving contact 4 are respectively connected to both ends of the circuit, so that the circuit can be closed or disconnected through the contact or distance between the static contact 3 and the moving contact 4. In order to avoid the problem of poor contact, it can be The stationary contact 3 and the movable contact 4 are provided with matching insert grooves and insert blocks, and a stable connection is achieved through the cooperation of the insert grooves and the insert blocks.

A first permanent magnet block 5 is fixedly installed on the side of the movable contact 4 away from the static contact 3 through a support rod, and at least two push assemblies 6 are arranged on the insulating housing 1 respectively located on both sides of the first permanent magnet block 5 , and the end of the insulating housing 1 away from the static contact 3 is also slidably connected to the push plate 7 connected to the external spring energy storage device. The push plate 7 is driven, and the push assembly 6 is used to cooperate with the first permanent magnet block 5 to generate a repulsive force to make the movable contact 4 move away from or close to the stationary contact 3 .

The external spring energy storage device is a conventional driving component in the vacuum circuit breaker. It mainly stores energy through the spring. When the circuit needs to be disconnected, the energy can be released through the spring, and the normal operation of the vacuum circuit breaker can be realized through the released energy.

As shown in Figures 1, 2 and 4, the push assembly 6 includes a limit assembly 9 for limiting the first permanent magnet block 5, and a control shaft 601 rotatably connected to the fixed rod 8 through a torsion spring, A push rod 602 fixedly connected to the control shaft 601 is provided on one side of the fixed rod 8. The torsion spring here is mainly used to control the relative angle between the push rod 602 and the fixed rod 8 in the absence of external force, so as to facilitate Subsequent normal use.

One end of the push rod 602 is fixedly connected with a second permanent magnet block 603 that matches the first permanent magnet block 5 , the other end of the push rod 602 is connected to the limiting shaft 604 through spring sliding, and the insulating housing 1 is provided with a limiter shaft 604 . The position shaft 604 is matched with the control board 605 used to make the second permanent magnet block 603 rotate with the control shaft 601 as the rotation center.

Here, the first permanent magnet block 5 and the second permanent magnet block 603 are preferably neodymium magnets, so as to ensure that the first permanent magnet block 5 and the second permanent magnet block 603 can keep enough force under the condition that the same poles repel each other. The gap can achieve the effect of preventing leakage through this gap when the circuit is disconnected or connected, and the safety is higher.

During use, the push plate 7 will drive the movement of the fixed rod 8, and further, the fixed rod 8 can drive the movement of the push rod 602 through the control shaft 601, and the push rod 602 will be in contact with the control board 605 during the movement, so Through the control plate 605, the push rod 602 is rotated by an angle, so that the first permanent magnet block 5 and the second permanent magnet block 603 are in a state opposite to the same pole, so that when the push plate 7 is continuously driven to move, the repulsion force can be used, The purpose of driving the moving contact 4 to contact the static contact 3 is achieved.

The magnetic poles of the first permanent magnet block 5 and the second permanent magnet block 603 are arranged opposite to each other to ensure that the magnetic poles of the first permanent magnet block 5 and the second permanent magnet block 603 can be rotated after the push rod 602 is rotated by a certain angle. In the same-sex repulsive state, further through the generated repulsion force, it is possible to push the moving contact 4 to contact or move away from the static contact 3 without contact, which can avoid the connection between the external spring energy storage device and the moving contact 4, and it is easy to When the equipment is aged for a long time, the leakage problem occurs, and there is a problem of potential safety hazards.

The control board 605 includes a guide groove 606 matched with the limit shaft 604, the side wall of the guide groove 606 is provided with dense rollers 607, and the opening position of one end of the guide groove 606 is on the same vertical plane as the control shaft 601, The relative distance between this opening position and another opening position is not greater than the distance between the limit shaft 604 and the control shaft 601 , so that the limit shaft 604 can be gradually deflected through the guide groove 606 during use. Inclined until the push rod 602 is driven to rotate by a certain angle on the original basis, so as to achieve the purpose of repulsion of the same poles of the first permanent magnet block 5 and the second permanent magnet block 603 .

The provided rollers 607 are mainly used to convert the sliding friction between the limit shaft 604 and the guide groove 606 into rolling friction, so as to avoid the friction between them being too large, which will affect the normal rotation of the push rod 602. question.

The control plate 605 is fitted with the limiting shaft 604 and the guide groove 606 to make the second permanent magnet block 603 rotate with the control shaft 601 as the rotation center at a maximum rotation angle of 90 degrees.

That is, after the push rod 602 is rotated by 90 degrees, it can drive the second permanent magnet block 603 to move to a state parallel to the first permanent magnet block 5 , thereby further ensuring the stability of the repulsion force.

The side of the control board 605 away from the limit shaft 604 is provided with an inclined chute 608. When the limit shaft 604 moves toward the control board 605, it passes over the control board 605 through the chute 608. The chute 608 here is mainly in one of the When the push rod 602 is reset, make sure that the limit shaft 604 can pass over the control board 605 normally, that is, when one of the push components 6 drives the movable contact 4 to contact or move away from the static contact 3, the two push components 6 Driven by a push plate 7 , the problem of reciprocating movement of the push rod 602 is involved. Further, the chute 608 can be used to avoid the problem that the control plate 605 will affect the normal movement of the push rod 602 .

The insulating housing 1 is connected to the limit bar 10 on the side of the control shaft 601 away from the control board 605 through a spring sliding connection, and a limit slot 11 is defined on the side of the control shaft 601 facing the limit bar 10 , and the limit slot 11 is in The second permanent magnet block 603 rotates 90 degrees with the control shaft 601 as the center of rotation and then engages with the limit bar 10 , and the length of the limit bar 10 is located at the minimum moving distance between the static contact 3 and the movable contact 4 when they are in contact. and the maximum movement distance.

During use, through the cooperation between the limit shaft 604 and the guide groove 606, the push rod 602 can drive the second permanent magnet block 603 to rotate 90 degrees, so as to cooperate with the first permanent magnet block 5 to generate a repulsive force, and the push rod rotates 90 degrees. After 10 degrees, the limit bar 10 and the limit slot 11 will be in the same position, and further, the limit bar 10 and the limit slot 11 can be fitted under the action of the spring, so as to realize the fixation of the current angular position of the push rod 602. Until it pushes the movable contact 4 to contact the static contact 3 through the repulsive force, after continuing to move a distance, the limit bar 10 can be disengaged from the engagement with the limit groove 11, and further under the action of the torsion spring and the action of the repulsive force , the second permanent magnet block 603 can be accommodated in the insulating housing 1 to avoid the first permanent magnet block 5 and the second permanent magnet block 603 being in a repulsive state for a long time, which is prone to demagnetization.

As shown in FIG. 1 and FIG. 5 , the limiting assembly 9 includes a limiting block 901 which is slidably connected to the insulating housing 1 by a spring and has an inclined structure on one side. The limiting block 901 is provided with a first pusher in a trapezoidal structure. Block 902 , and a second push block 903 that matches the first push block 902 and is used to accommodate the first push block 902 into the insulating housing 1 is provided on the push plate 7 .

After the second push block 903 is in contact with the first push block 902, the second push block 903 will continue to move to push the first push block 902, and further, the limiting block 901 can be accommodated in the insulating housing, so that the first push block 901 can be permanently moved. The magnet block 5 can move freely.

In the actual use process, the push rod 602 is first rotated by 90 degrees through the control panel 605. During this process, the second push block 903 can be gradually brought close to the first push block 902, and at the same time, the push rod 602 is rotated 90 degrees. The limit bar 10 will cooperate with the limit slot 11 to fix the current angle of the push rod 602, and continue to drive the movement of the push rod 602, which will simultaneously drive the movement of the second push block 903 to make it pass the first push block 902 accommodate the limiting block 901 into the insulating housing 1, at this time the first permanent magnet block 5 can move freely, and continue to push the movement of the first permanent magnet block 5 through the second permanent magnet block 603, which will gradually The first permanent magnet block 5 is moved to another limit assembly 9, and the position of the first permanent magnet block 5 is limited by the other limit assembly 9. Continuing the movement will cause the limit bar 10 and the limit slot 11 to move. The separation is performed, so that the second permanent magnet block 603 is accommodated in the insulating housing 1 under the action of the repulsion force and the torsion spring, and the contact or distance between the movable contact 4 and the stationary contact 3 is completed.

The static contact 3 includes an electrical connection block 301 that is connected to the external circuit. The electrical connection block 301 is connected with a static contact piece 302 for contacting the static contact 3 through a spring sliding connection. The limit assembly 9 is provided with at least two , and the distance between the two limiting components 9 is located between the minimum movement distance and the maximum movement distance of the static contact 3 and the movable contact 4 when they are in contact. The cooperation of the static contact piece 302 realizes the function of buffering, which is used to provide a certain buffering distance for the push rod 602, so as to ensure the stable contact between the moving contact 4 and the static contact 3, and at the same time, the second permanent magnet block 603 can be After the position of the movable contact 4 is adjusted and stored in the insulating housing 1 , the problem of demagnetization of the first permanent magnet block 5 and the second permanent magnet block 603 can be effectively avoided.

Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present invention, which will be obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (8)

1. A vacuum circuit breaker is characterized by comprising an insulating shell (1), wherein a vacuum arc extinguishing chamber (2) is arranged in the insulating shell (1), a static contact (3) is fixedly connected to one end of the vacuum arc extinguishing chamber (2), and a movable contact (4) matched with the static contact (3) is slidably connected to the other end of the vacuum arc extinguishing chamber (2);

a first permanent magnet block (5) is fixedly arranged on one side, away from the static contact (3), of the moving contact (4) through a support rod, at least two pushing assemblies (6) which are used for repelling the first permanent magnet block (5) are arranged on the insulating shell (1), and the pushing assemblies (6) are arranged on the outer side of the first permanent magnet block (5) in a surrounding manner; a pushing plate (7) connected with an external spring energy storage device is further connected to one end, far away from the static contact (3), of the insulating shell (1) in a sliding mode, the pushing plate (7) is connected with each pushing assembly (6) through at least two fixing rods (8) and used for pushing the pushing assemblies (6) to be close to or far away from the first permanent magnet block (5) and driving the moving contact (4) to be far away from or close to the static contact (3);

the pushing assembly (6) comprises a limiting assembly (9) for limiting the first permanent magnet (5) and a control rotating shaft (601) which is rotatably connected to a fixing rod (8) through a torsion spring, and a pushing rod (602) fixedly connected with the control rotating shaft (601) is arranged on one side of the fixing rod (8); one end of the push rod (602) is fixedly connected with a second permanent magnet (603) matched with the first permanent magnet (5), the other end of the push rod (602) is connected with a limiting shaft (604) in a sliding mode through a spring, a control plate (605) connected with the limiting shaft (604) is arranged on the insulating shell (1), and the control plate (605) is used for pushing the second permanent magnet (603) to rotate by taking the control rotating shaft (601) as a rotating center;

the first permanent magnet block (5) and the second permanent magnet block (603) have opposite magnetic poles.

2. The vacuum circuit breaker according to claim 1, wherein the control board (605) comprises a guide groove (606) engaged with the stopper shaft (604), and a plurality of rollers (607) are disposed on a side wall of the guide groove (606).

3. A vacuum interrupter as claimed in claim 2, wherein the maximum rotation angle of the second permanent magnet (603) around the control shaft (601) is 90 degrees.

4. The vacuum circuit breaker according to claim 2, wherein a side of the control board (605) away from the limit shaft (604) is provided with a chute (608) in a tilted shape, and the limit shaft (604) passes over the control board (605) through the chute (608) when moving towards the control board (605).

5. The vacuum circuit breaker according to claim 2, wherein a position-limiting bar (10) is slidably connected to the insulating housing (1) through a spring, the position-limiting bar (10) is located on a side of the control shaft (601) away from the control board (605), a position-limiting groove (11) is formed on a side of the control shaft (601) facing the position-limiting bar (10), and when the second permanent magnet (603) rotates 90 degrees around the control shaft (601), the position-limiting groove (11) is engaged with the position-limiting bar (10).

6. The vacuum circuit breaker according to claim 1, wherein the limiting assembly (9) comprises a limiting block (901) slidably connected to the insulating housing (1) through a spring, a first pushing block (902) having a trapezoid structure is disposed on the limiting block (901), and a second pushing block (903) matched with the first pushing block (902) and used for receiving the first pushing block (902) into the insulating housing (1) is disposed on the pushing plate (7).

7. The vacuum circuit breaker according to claim 5, wherein the fixed contact (3) comprises an electricity connection block (301) connected with an external line, a fixed contact piece (302) for contacting with the fixed contact (3) is slidably connected to the electricity connection block (301) through a spring, and the length of the limit strip (10) ranges between the minimum movement distance and the maximum movement distance of the fixed contact (3) contacting with the movable contact (4).

8. A vacuum interrupter as claimed in claim 6, characterized in that there are at least two limiting assemblies (9), and the distance between the limiting assemblies (9) ranges between the minimum moving distance and the maximum moving distance of the stationary contact (3) and the movable contact (4) when they are in contact.

Images