CN116978733A - Vacuum circuit breaker - Google Patents

Abstract

The invention discloses a vacuum circuit breaker, which comprises a contact holding spring, an energy dissipation device, a fixed contact, a moving contact, a fixed conducting rod, a fixed end connecting conductor, a fixed end supporting piece, a bridging piece and a fixed connecting terminal, wherein the fixed end connecting conductor is connected with the bridging piece; the bridging piece, the static end connecting conductor, the static conducting rod and the static contact are sequentially and fixedly connected along a first direction; the contact retention spring is positioned between the stationary terminal and the crossover, and the contact retention spring is in a compressed state. During closing operation, the moving inertia of the moving contact can impact the fixed contact, the compression force of the contact retaining spring can offset the impact force of the moving contact on the fixed contact, the moving contact and the fixed contact are guaranteed to be fast and stable during closing operation, further the reliability of live operation of the vacuum circuit breaker is guaranteed, and multiple arc burning and contact ablation caused by closing bounce among the contacts in live operation of the vacuum circuit breaker are avoided.

Description

Vacuum circuit breaker

Technical Field

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

Background

Among the high voltage circuit breakers of the current transmission class, SF6 circuit breakers are dominant, while SF6 gas is a strong greenhouse effect gas, and the global warming potential (global warming potential, GWP) is 23900 times that of carbon dioxide, the use of which will be severely limited. The unique technical characteristics of the vacuum circuit breaker determine the green and environment-friendly characteristics of the vacuum circuit breaker, and the vacuum circuit breaker is widely applied to the field of medium-voltage power distribution at present.

In the vacuum circuit breaker, a moving contact and a fixed contact which are positioned in a vacuum arc-extinguishing chamber are of a flat-plate butt-joint structure, and when the vacuum circuit breaker is in a closing position and the vacuum circuit breaker is electrified to run, the flowing current can generate repulsive electric force between the moving contact and the fixed contact. In the closing process of the vacuum circuit breaker, the action inertia of the moving contact can impact the fixed contact, so that the contact repeatedly bounces in the closing process.

Disclosure of Invention

The invention provides a vacuum circuit breaker, which is used for avoiding the bouncing of a contact during closing and the overstroke overshoot, bouncing and vibration of the contact during opening, and ensuring the reliability of the live operation of the vacuum circuit breaker.

According to an aspect of the present invention, there is provided a vacuum circuit breaker including: the device comprises a contact holding spring, an energy dissipation device, a fixed contact, a moving contact, a fixed conducting rod, a fixed end connecting conductor, a fixed end supporting piece, a bridging piece and a fixed wiring terminal;

the bridging piece, the static end connecting conductor, the static conducting rod and the static contact are sequentially and fixedly connected along a first direction;

the contact holding spring is positioned between the static wiring terminal and the bridging piece, and is in a compressed state;

the contact holding spring is used for providing contact pressure and holding force of the fixed contact and the moving contact in a closed state;

the energy dissipation device is positioned between the static wiring terminal and the bridging piece, one end of the energy dissipation device is fixedly connected with the static wiring terminal, and the other end of the energy dissipation device is fixedly connected with the first end part of the bridging piece;

the energy dissipation device is used for converting kinetic energy of the bridging piece, the static end connecting conductor, the static conducting rod and the static contact into heat energy;

the first end of the bridging piece is contacted with the contact maintaining spring, and the second end of the bridging piece is fixedly connected with the static end connecting conductor.

Optionally, the vacuum circuit breaker further comprises a static end support and a first sliding contact group;

the static end support piece is fixedly connected with the static wiring terminal, and the static end support piece is in sliding connection with the static end connecting conductor through the first sliding contact group;

the first end of the static end connecting conductor is fixedly connected with the second end of the bridging piece, the second end of the static end connecting conductor is fixedly connected with the static conductive rod, and the first end of the static end connecting conductor is positioned in the inner cavity of the static end supporting piece;

the contact retention spring, the energy dissipating device, and the crossover are all located in the interior cavity of the dead end support.

Optionally, the vacuum circuit breaker further comprises a movable conducting rod, a movable pull rod, a second sliding contact group and a movable end supporting piece;

the movable contact, the movable conducting rod and the movable pull rod are sequentially and fixedly connected along the first direction;

the movable conducting rod and the movable pull rod are both partially positioned in the inner cavity of the movable end support piece;

the movable conducting rod and the movable end support piece are connected in a sliding mode through the second sliding contact group.

Optionally, the inner cavity of the static end support member includes an annular boss, an inner diameter of the annular boss is smaller than a diameter of the first end of the bridging member in a second direction, and an inner diameter of the annular boss is larger than a diameter of the second end of the bridging member in the second direction, and the second direction is perpendicular to the first direction.

Optionally, the vacuum circuit breaker further comprises a vacuum arc extinguishing chamber shell, a first corrugated pipe and a second corrugated pipe;

the static contact and the moving contact are positioned in the vacuum arc-extinguishing chamber shell, and the static conducting rod and the moving conducting rod are both partially positioned in the vacuum arc-extinguishing chamber shell;

the first corrugated pipe is sleeved on the static conductive rod, the first corrugated pipe is fixedly connected with the first end part of the vacuum arc-extinguishing chamber shell, the second corrugated pipe is sleeved on the movable conductive rod, and the second corrugated pipe is fixedly connected with the second end part of the vacuum arc-extinguishing chamber shell.

Optionally, the movable contact is rigidly connected with the movable conductive rod, and the movable conductive rod is rigidly connected with the movable pull rod.

Optionally, the first sliding contact group is sleeved at one end of the static end connecting conductor connected with the bridging piece, the first sliding contact group is positioned at one end of the static end supporting piece close to the static contact, and the static end connecting conductor is connected with the static end supporting piece through the first sliding contact group;

the second sliding contact group is sleeved on the movable conductive rod, the second sliding contact group is positioned at one end of the movable end supporting piece, which is close to the movable contact, and the movable conductive rod is connected with the movable end supporting piece through the second sliding contact group.

Optionally, the contact holding spring is a cylindrical coil spring.

The vacuum circuit breaker provided by the embodiment of the invention comprises a contact holding spring, an energy dissipation device, a static contact, a moving contact, a static conducting rod, a static end connecting conductor, a static end supporting piece, a bridging piece and a static wiring terminal; the bridging piece, the static end connecting conductor, the static conducting rod and the static contact are sequentially and fixedly connected along a first direction; the contact retention spring is positioned between the stationary terminal and the crossover, and the contact retention spring is in a compressed state. When the vacuum circuit breaker is in a closing state, the current flowing through the fixed contact and the moving contact can generate a repulsive force between the moving contact and the fixed contact, and the contact retaining spring connected with the fixed contact through the bridging piece, the fixed end connecting conductor and the fixed conducting rod generates a compression force on the fixed contact because of being in a compression state, wherein the directions of the compression force and the repulsive force are opposite, and the compression force generated by the contact retaining spring acts on the fixed contact, so that the separation and bouncing between the moving contact and the fixed contact can be avoided during closing. During closing operation, the moving inertia of the moving contact can impact the fixed contact, part of kinetic energy of the contact is converted into elastic potential energy of the contact holding spring, and the other part of kinetic energy is converted into heat energy through the energy dissipation device, so that the moving contact and the fixed contact are ensured to be quickly and stably lowered during closing operation, the reliability of live operation of the vacuum circuit breaker is further ensured, and multiple arc burning and contact ablation caused by closing bounce among the contacts in the live operation of the vacuum circuit breaker are avoided.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a vacuum circuit breaker in a closing state according to an embodiment of the present invention;

fig. 2 is a partial enlarged view of an AA area in a vacuum circuit breaker according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a vacuum circuit breaker in a breaking state according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic structural diagram of a vacuum circuit breaker in a closing state according to an embodiment of the present invention, and referring to fig. 1, the vacuum circuit breaker includes: the contact holding spring 1, the energy dissipation device 18, the fixed contact 2, the movable contact 7, the fixed conductive rod 3, the fixed end connecting conductor 4, the fixed end supporting piece 11, the bridging piece 5 and the fixed wiring terminal 6;

the bridging piece 5, the static end connecting conductor 4, the static conducting rod 3 and the static contact 1 are sequentially and fixedly connected along the first direction X;

the contact holding spring 1 is positioned between the static wiring terminal 6 and the bridging piece 5, and the contact holding spring 1 is in a compressed state;

the contact holding spring 1 is used for providing contact pressure and holding force of the fixed contact 2 and the movable contact 7 in a closed state and overcoming electric repulsive force generated between the fixed contact 2 and the movable contact 7;

the energy dissipation device 18 is positioned between the static wiring terminal 6 and the bridging piece 5, one end of the energy dissipation device 18 is fixedly connected with the static wiring terminal 6, and the other end of the energy dissipation device 18 is fixedly connected with the first end part of the bridging piece 5;

the energy dissipation device 18 is used for converting kinetic energy of the bridging piece 5, the static end connecting conductor 4, the static conducting rod 3 and the static contact 1 into heat energy;

the first end of the bridging member 5 is in contact with the contact holding spring 1, and the second end of the bridging member 5 is fixedly connected with the stationary end connecting conductor 4.

With continued reference to fig. 1, the vacuum circuit breaker optionally further comprises a movable conductive rod 8, a movable tie rod 9, a second set of sliding contacts 13 and a movable end support 10;

the movable contact 7, the movable conducting rod 8 and the movable pull rod 9 are sequentially and fixedly connected along a first direction X;

the movable conducting rod 8 and the movable pull rod 9 are both partially positioned in the inner cavity of the movable end support piece 10;

the movable conductive rod 8 and the movable end support 10 are slidably connected by a second sliding contact group 13.

The static contact 2 is a relatively static part in the opening and closing operation of the vacuum circuit breaker, the moving contact 7 is a relatively moving part in the opening and closing operation process of the vacuum circuit breaker, and the conducting and breaking of a conductive loop of the vacuum circuit breaker are realized through the closing and opening of the static contact and the moving contact, wherein the static contact 2 and the moving contact 7 are positioned in a vacuum arc-extinguishing chamber of the vacuum circuit breaker. The movable end support 10 is cylindrical and provides a supporting force for the movable conducting rod 8 and the movable pull rod 9. The movable conducting rod 8 is a conductor, the movable pull rod 9 is an insulator, the movable pull rod 9 and the movable conducting rod 8 can move along the first direction X, and then the control brake contact 7 moves along the first direction X, so that the closing and opening operations of the vacuum circuit breaker are realized. Specifically, the moving pull rod 9 is controlled to move along the direction that the moving contact 7 points to the fixed contact 2, so that the moving contact 7 moves towards the direction close to the fixed contact 2 until the moving contact moves to a closing position, and closing operation is achieved. The movable pull rod 9 is controlled to move along the direction of the fixed contact 2 pointing to the movable contact 7, so that the movable contact 7 moves away from the fixed contact 2 until the movable contact moves to the opening position, and the opening operation is realized.

The contact holding spring 1, the bridging piece 5, the static end connecting conductor 4, the static conductive rod 3 and the static contact 1 are all coaxially arranged, and the first direction X may be the axial direction of the contact holding spring 1, the bridging piece 5, the static end connecting conductor 4, the static conductive rod 3 and the static contact 1. Alternatively, the contact holding spring 1 is a cylindrical coil spring.

The energy dissipating device 18 comprises a buffer cylinder and a piston rod, the piston rod is fixedly connected with the first end of the bridging member 5, and the buffer cylinder is fixedly connected with the static wiring terminal 6. One end of the piston rod extends into the inner cavity of the buffer cylinder, and the buffer cylinder is filled with buffer medium, which can be hydraulic oil, air or a compression spring by way of example. The buffer cylinder is used for generating damping force when the vacuum circuit breaker is closed. When the moving contact 7 reaches the closing position and then moves towards the direction close to the fixed contact 2 during closing operation, the fixed contact 2 compresses the energy dissipation device 18 through the fixed conducting rod 3, the fixed end connecting conductor 4 and the bridging piece 5, and then redundant kinetic energy generated when the moving contact 7 impacts the fixed contact 2 is converted into heat energy, so that the moving contact 7 and the fixed contact 2 are quickly and stably closed, and the phenomenon of repeated bouncing among the contacts is effectively restrained.

When the vacuum circuit breaker is in a switching-off state and performs switching-on operation, an operating mechanism connected through a movable pull rod 9 controls a brake contact 7 to move towards a direction close to a fixed contact 2, and the inertia of the movable contact 7 can enable the movable contact 7 to move towards the direction close to the fixed contact 2 after being in a switching-on position, namely, an over-stroke stage is entered. After the over-travel stage is entered, the static contact 2 compresses the contact holding spring 1 due to the pressure of the moving contact 7, part of kinetic energy of the static contact 2 is converted into elastic potential energy of the contact holding spring 1, and the other part of kinetic energy is converted into heat energy through the energy dissipation device 18, so that the inertia effect of the moving contact 7 is eliminated, the static contact 2 and the moving contact 7 are quickly and stably lowered, and the repeated bouncing phenomenon between the contacts is effectively restrained. And further, the reliability of live operation of the vacuum circuit breaker is ensured, and multiple arc burning and contact ablation caused by closing bounce among contacts in the live operation of the vacuum circuit breaker are avoided. Meanwhile, after switching on, the current flowing through the fixed contact 2 can generate a repulsive force on the fixed contact, and the contact holding spring 1 generates a compression force on the fixed contact 2 due to the compression state, so that the compression force can counteract the repulsive force, and the switching on stability of the vacuum circuit breaker is ensured.

When the vacuum circuit breaker is in a closing state, electric repulsive force can be generated between the moving contact and the static contact by current flowing through the static contact and the moving contact, and a contact holding spring connected with the static contact through a bridging piece, a static end connecting conductor and a static conducting rod is in a compression state to generate a compression force on the static contact, wherein the directions of the compression force and the repulsive force are opposite, and the compression force generated by the contact holding spring acts on the static contact, so that separation and bouncing between the moving contact and the static contact can be avoided during closing.

With continued reference to fig. 1, optionally, the compression force of the contact holding spring 1 is greater than the electric repulsive force between the moving contact 7 and the stationary contact 2 when a rated current flows in the vacuum circuit breaker. When the vacuum circuit breaker is applied in a circuit and the circuit works normally, rated current flows through the vacuum circuit breaker, and when rated current flows between the moving contact 7 and the fixed contact 2, electric repulsive force is generated due to the rated current, and aiming at the fixed contact 2, electric repulsive force which is directed to the direction of the fixed contact 2 by the moving contact 7 is generated, and the compression force of the contact retaining spring 1 is opposite to the direction of the electric repulsive force which is received by the fixed contact 2, so that the action of the electric repulsive force on the fixed contact 2 is counteracted, the fixed contact is prevented from bouncing during closing, and the reliability of electrified operation of the vacuum circuit breaker is ensured.

With continued reference to fig. 1, optionally, the compression force of the contact holding spring 1 is greater than the electric repulsive force between the moving contact 7 and the stationary contact 2 when a preset fault current flows in the vacuum circuit breaker. The preset fault current is a current value in a circuit when the circuit set according to a related standard, such as a GB standard, fails. When the preset fault current is larger than the rated current, the electric repulsive force between the moving contact 7 and the fixed contact 2 is larger than the electric repulsive force between the moving contact 7 and the fixed contact 2 when the rated current flows in the vacuum circuit breaker. When the compression force of the contact holding spring 1 is set to be larger than the electric repulsive force between the moving contact 7 and the fixed contact 2 when the preset fault current flows in the vacuum circuit breaker, the electric repulsive force of the fault current in the circuit to the fixed contact 2 when the fault occurs in the circuit can be counteracted by the compression force of the contact holding spring 1, and the tolerance capability of the fault current is improved.

With continued reference to fig. 1, the vacuum circuit breaker optionally further comprises a stationary end support 11 and a first set of sliding contacts 12;

the static end support piece 11 is fixedly connected with the static wiring terminal 6, and the static end support piece 11 is in sliding connection with the static end connecting conductor 4 through the first sliding contact group 12;

the first end of the static end connecting conductor 4 is fixedly connected with the second end of the bridging piece 5, the second end of the static end connecting conductor 4 is fixedly connected with the static conductive rod 3, and the first end of the static end connecting conductor 4 is positioned in the inner cavity of the static end supporting piece 11;

the contact retention spring 1, the energy dissipater 18 and the crossover 5 are all located in the interior cavity of the dead end support 11.

The stationary end support 11 is cylindrical, the stationary end support 11 comprises an inner cavity, and the contact retention spring 1, the energy dissipating device 18 and the bridging member 5 are all located in the inner cavity of the stationary end support 11. The bridging member 5 is an insulator, the static end connecting conductor 4 is a conductor, both the bridging member 5 and the static end connecting conductor 4 are in a T shape, and specifically reference may be made to fig. 2, fig. 2 is a partial enlarged view of an AA area in the vacuum circuit breaker provided in the embodiment of the present invention, and fig. 2 is an enlarged view of the AA area in fig. 1. The bridging element 5 and the stationary connection conductor 4 can move to a small extent in the interior space of the stationary support 11. The contact holding spring 1 abuts between the stationary terminal 6 and the bridging member 5.

With continued reference to fig. 1, optionally, the first sliding contact set 12 is sleeved at the end of the static end connecting conductor 4 connected with the bridging piece 5, the first sliding contact set 12 is located at the end of the static end supporting piece 11 close to the static contact 2, and the static end connecting conductor 4 is connected with the static end supporting piece 11 through the first sliding contact set 12;

the second sliding contact group 13 is sleeved on the movable conducting rod 8, the second sliding contact group 13 is positioned at one end of the movable end support piece 10, which is close to the movable contact 7, and the movable conducting rod 8 is connected with the movable end support piece 10 through the second sliding contact group 13.

The vacuum circuit breaker further includes a movable connection terminal 14, and the movable connection terminal 14 is fixedly connected with the movable end support 10. Because the static end connecting conductor 4 moves in the inner cavity of the static end supporting piece 11, a gap is reserved between the static end connecting conductor 4 and the static end supporting piece 11, the first sliding contact set 12 is sleeved on the static end connecting conductor 4 for ensuring the transmission of current in a circuit, and the position of the first sliding contact set 12 is fixed. The first sliding contact set 12 includes two sliding contacts, each sliding contact is a ring-shaped conductor, the inner diameter of each sliding contact is in contact with the static end connecting conductor 4, the outer wall of each sliding contact is connected with the static end supporting member 11, and an electric signal such as current is transmitted from the static end connecting conductor 4 to the static end supporting member 11 or an electric signal such as current on the static end supporting member 11 is transmitted to the static end connecting conductor 4 through the first sliding contact set 12. Because the movable conducting rod 8 moves in the inner cavity of the movable end support piece 10, a gap is reserved between the movable conducting rod 8 and the movable end support piece 10, a second sliding contact group 13 is arranged on the movable conducting rod 8 in a sleeved mode for ensuring current transmission in a circuit, and the position of the second sliding contact group 13 is fixed. The inner diameter of each sliding contact in the second sliding contact set 13 is in contact with the movable conducting rod 8, the outer wall of each sliding contact is connected with the movable supporting piece 10, and an electric signal such as current is transmitted to the movable supporting piece 10 from the movable conducting rod 8 or an electric signal such as current on the movable supporting piece 10 is transmitted to the movable conducting rod 8 through the second sliding contact set 13. By providing the first sliding contact set 12 and the second sliding contact set 13, the vacuum circuit breaker can be made to form a current transmission path, so that current is transmitted to the static wiring terminal 6 by the movable wiring terminal 14, the movable end support 10, the second sliding contact set 13, the movable conductive rod 8, the movable contact 7, the static contact 2, the static conductive rod 3, the static end connection conductor 4, the first sliding contact set 12, the static end support 11, or the current is transmitted in the opposite direction of the above direction.

With continued reference to fig. 1, the vacuum interrupter optionally further comprises a vacuum interrupter housing 15, a first bellows 16 and a second bellows 17;

the static contact 2 and the moving contact 7 are positioned in the vacuum arc-extinguishing chamber shell 15, and the static conductive rod 3 and the moving conductive rod 8 are both partially positioned in the vacuum arc-extinguishing chamber shell 15;

the first corrugated pipe 16 is sleeved on the static conductive rod 3, the first corrugated pipe 16 is fixedly connected with the first end part of the vacuum arc-extinguishing chamber shell 15, the second corrugated pipe 17 is sleeved on the movable conductive rod 8, and the second corrugated pipe 17 is fixedly connected with the second end part of the vacuum arc-extinguishing chamber shell 15.

The first end and the second end of the vacuum interrupter housing 15 are oppositely arranged, wherein the first end of the vacuum interrupter housing 15 is one end of the vacuum interrupter housing 15 along the first direction X and positioned on one side of the fixed contact 2, and the second end of the vacuum interrupter housing 15 is one end of the vacuum interrupter housing 15 along the first direction X and positioned on one side of the movable contact 7. The static conductive rod 3 and the movable conductive rod 8 all move, so gaps exist between the static conductive rod 3 and the movable conductive rod 8 and the vacuum arc-extinguishing chamber shell 15, and the movable contact 7 and the static contact 2 cannot be ensured to be in a complete vacuum environment. The first corrugated pipe 16 and the second corrugated pipe 17 are both of annular structures, the inner diameter of the first corrugated pipe 16 is fixedly connected with the static conductive rod 3, the first end part of the first corrugated pipe 16 is fixedly connected with the first end part of the vacuum arc extinguishing chamber shell 15, and the first end part of the first corrugated pipe 16 is one end, far away from the static contact 2, of the first corrugated pipe 16 along the first direction. The inner diameter of the second corrugated pipe 17 is fixedly connected with the movable conducting rod 8, and the first end part of the second corrugated pipe 17 is fixedly connected with the second end part of the vacuum arc extinguishing chamber shell 15, wherein the first end part of the second corrugated pipe 17 is one end, far away from the movable contact 7, of the second corrugated pipe 17 along the first direction. The moving contact 7 and the fixed contact 2 are sealed in a vacuum environment through the first corrugated pipe 16 and the second corrugated pipe 17, so that the moving contact 7 and the fixed contact 2 in the vacuum arc-extinguishing chamber can move and high vacuum degree in the arc-extinguishing chamber is maintained.

Referring to fig. 1 and 2, the inner cavity of the stationary end support 11 includes an annular boss 19, an inner diameter of the annular boss 19 is smaller than a diameter of the first end of the bridging member 5 in the second direction Y, and an inner diameter of the annular boss 19 is larger than a diameter of the second end of the bridging member 5 in the second direction Y, which is perpendicular to the first direction X.

The bridging member 5 is of a T-shaped columnar structure, the diameter of the annular boss 19 is smaller than the diameter of the first end part of the bridging member 5 along the second direction Y, and the diameter of the annular boss 19 is larger than the diameter of the second end part of the bridging member 5 along the second direction Y, so that the bridging member 5 stops moving to the annular boss 19 at most when moving towards the direction close to the moving contact 7. By providing the annular boss 19, the contact-holding spring 1 and the energy dissipating device 18 can be ensured to move in the inner cavity of the stationary end support 11.

Fig. 3 is a schematic structural diagram of the vacuum circuit breaker in a breaking state, referring to fig. 2 and 3, when the vacuum circuit breaker is in a closing state and performs breaking operation, an operating mechanism pulls a conductive rod 8 and a moving contact 7 to move in a contact separation direction through a moving pull rod 9, and when the operating mechanism drives the moving conductive rod 8 and the moving contact 7 to move through the moving pull rod 9, elastic potential energy generated by releasing compression of a contact retaining spring 1 provides kinetic energy for movement of the moving contact 7, so that the contact movement speed in the early breaking stage of the vacuum circuit breaker can be effectively improved, the moving contact 7 and a fixed contact 2 of the vacuum circuit breaker can be quickly separated, and current breaking in live operation of the vacuum circuit breaker is facilitated. At the moment of separating the fixed contact 2 from the moving contact 7, the fixed contact 2 stops moving under the limit action of the annular boss 19 of the fixed end support 11, and is further in a static state under the action of the contact holding spring 1. The moving contact 7 continues to move in the direction deviating from the fixed contact 2 under the pulling of the operating mechanism, before the vacuum circuit breaker reaches the opening position, the operating mechanism enters a buffer braking stage, as the contact retaining spring is not arranged on one side of the moving contact 7 of the vacuum circuit breaker, and the moving contact 7 is rigidly connected with the moving conducting rod 8, the moving conducting rod 8 is rigidly connected with the moving pull rod 9, the moving contact 7 can synchronously move with the operating mechanism, and the phenomena of stroke overshoot and repeated bouncing and vibration when the moving contact 7 is opened are effectively inhibited, so that the stable opening of the vacuum circuit breaker is realized. Meanwhile, because stroke overshoot is effectively restrained when the movable contact 7 is opened, the second corrugated pipe 17 in the vacuum arc-extinguishing chamber moves within an allowable range, mechanical fatigue caused by excessive compression and extrusion of the second corrugated pipe 17 is avoided, and the reliability and the mechanical life of the second corrugated pipe 17 are ensured. Meanwhile, the movable contact end is not provided with a contact holding spring, so that the moving quality of the movable contact end is greatly reduced, and the operation work of the operation mechanism can be effectively reduced.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (8)

1. A vacuum circuit breaker, comprising: the device comprises a contact holding spring, an energy dissipation device, a fixed contact, a moving contact, a fixed conducting rod, a fixed end connecting conductor, a fixed end supporting piece, a bridging piece and a fixed wiring terminal;

the bridging piece, the static end connecting conductor, the static conducting rod and the static contact are sequentially and fixedly connected along a first direction;

the contact holding spring is positioned between the static wiring terminal and the bridging piece, and is in a compressed state;

the contact holding spring is used for providing contact pressure and holding force of the fixed contact and the moving contact in a closed state;

the energy dissipation device is positioned between the static wiring terminal and the bridging piece, one end of the energy dissipation device is fixedly connected with the static wiring terminal, and the other end of the energy dissipation device is fixedly connected with the first end part of the bridging piece;

the energy dissipation device is used for converting kinetic energy of the bridging piece, the static end connecting conductor, the static conducting rod and the static contact into heat energy;

the first end of the bridging piece is contacted with the contact maintaining spring, and the second end of the bridging piece is fixedly connected with the static end connecting conductor.

2. The vacuum interrupter of claim 1, further comprising a stationary end support and a first set of sliding contacts;

the static end support piece is fixedly connected with the static wiring terminal, and the static end support piece is in sliding connection with the static end connecting conductor through the first sliding contact group;

the first end of the static end connecting conductor is fixedly connected with the second end of the bridging piece, the second end of the static end connecting conductor is fixedly connected with the static conductive rod, and the first end of the static end connecting conductor is positioned in the inner cavity of the static end supporting piece;

the contact retention spring, the energy dissipating device, and the crossover are all located in the interior cavity of the dead end support.

3. The vacuum circuit breaker of claim 2, further comprising a movable conductive rod, a movable tie rod, a second set of sliding contacts, and a movable end support;

the movable contact, the movable conducting rod and the movable pull rod are sequentially and fixedly connected along the first direction;

the movable conducting rod and the movable pull rod are both partially positioned in the inner cavity of the movable end support piece;

the movable conducting rod and the movable end support piece are connected in a sliding mode through the second sliding contact group.

4. The vacuum interrupter of claim 2, wherein the inner cavity of the dead end support includes an annular boss having an inner diameter that is smaller than a diameter of the first end of the crossover in a second direction that is perpendicular to the first direction that is larger than a diameter of the second end of the crossover in the second direction.

5. The vacuum interrupter of claim 3, further comprising a vacuum interrupter housing, a first bellows, and a second bellows;

the static contact and the moving contact are positioned in the vacuum arc-extinguishing chamber shell, and the static conducting rod and the moving conducting rod are both partially positioned in the vacuum arc-extinguishing chamber shell;

the first corrugated pipe is sleeved on the static conductive rod, the first corrugated pipe is fixedly connected with the first end part of the vacuum arc-extinguishing chamber shell, the second corrugated pipe is sleeved on the movable conductive rod, and the second corrugated pipe is fixedly connected with the second end part of the vacuum arc-extinguishing chamber shell.

6. A vacuum interrupter according to claim 3, wherein the movable contact is rigidly connected to the movable conductive rod, and wherein the movable conductive rod is rigidly connected to the movable pull rod.

7. The vacuum circuit breaker according to claim 3, wherein the first sliding contact group is sleeved at one end of the stationary end connecting conductor connected with the bridging member, the first sliding contact group is positioned at one end of the stationary end supporting member close to the stationary contact, and the stationary end connecting conductor is connected with the stationary end supporting member through the first sliding contact group;

the second sliding contact group is sleeved on the movable conductive rod, the second sliding contact group is positioned at one end of the movable end supporting piece, which is close to the movable contact, and the movable conductive rod is connected with the movable end supporting piece through the second sliding contact group.

8. The vacuum circuit breaker of claim 1, wherein the contact retention spring is a cylindrical coil spring.