阅读说明：本技术 一种断路器及灭弧室 (Circuit breaker and arc extinguish chamber ) 是由 刘旭 卢鹏 张海宾 马靖 孙元元 赵楠 苏其莉 张振飞 申笑林 郝致远 王奥 于 2021-06-03 设计创作，主要内容包括：本发明涉及一种断路器及灭弧室。灭弧室,包括：分合闸主路,其上设有主动触头和主静触头,主动触头与主静触头之间形成主断口；分合闸电阻支路,分合闸电阻支路上设有电阻动触头和电阻静触头,电阻动触头和电阻静触头之间形成电阻断口；复位弹簧,用于向电阻静触头施加迫使其复位的弹性作用力；传动机构,与主动触头和电阻动触头传动连接,传动机构、主动触头以及电阻动触头处于主断口的同一侧；还包括：合闸电阻,与主静触头和电阻静触头导电连接,合闸电阻、主静触头以及电阻静触头处于主断口的同一侧。将合闸电阻和传动机构设置在断口两侧,可以减小灭弧室的径向尺寸,进而使得断路器壳体的尺寸相应减小,有利于断路器的小型化设计。(The invention relates to a circuit breaker and an arc extinguish chamber. An arc chute, comprising: the main opening and closing circuit is provided with a driving contact and a main static contact, and a main fracture is formed between the driving contact and the main static contact; the switching-on and switching-off resistance branch circuit is provided with a resistance moving contact and a resistance static contact, and a resistance fracture is formed between the resistance moving contact and the resistance static contact; the return spring is used for applying elastic acting force for forcing the resistance static contact to return; the transmission mechanism is in transmission connection with the active contact and the resistance moving contact, and the transmission mechanism, the active contact and the resistance moving contact are positioned on the same side of the main fracture; further comprising: and the closing resistor is electrically connected with the main static contact and the resistor static contact, and the closing resistor, the main static contact and the resistor static contact are positioned on the same side of the main fracture. The closing resistor and the transmission mechanism are arranged on two sides of the fracture, so that the radial size of the arc extinguish chamber can be reduced, the size of the shell of the circuit breaker is correspondingly reduced, and the miniaturization design of the circuit breaker is facilitated.)

1. An arc chute, comprising:

the main circuit of the opening and closing switch is provided with an active contact (20) and a main static contact (19), and a main fracture (28) is formed between the active contact (20) and the main static contact (19);

the opening and closing resistance branch circuit is arranged in parallel with the opening and closing main circuit, a resistance moving contact (24) and a resistance static contact (23) are arranged on the opening and closing resistance branch circuit, and a resistance fracture (29) is formed between the resistance moving contact (24) and the resistance static contact (23);

the return spring is used for applying elastic acting force for forcing the resistance static contact (23) to return;

the transmission mechanism is in transmission connection with the active contact (20) and the resistance moving contact (24), and the transmission mechanism, the active contact (20) and the resistance moving contact (24) are positioned on the same side of the main fracture (28);

it is characterized by also comprising:

and the closing resistor (18) is in conductive connection with the main static contact (19) and the resistance static contact (23), and the closing resistor (18), the main static contact (19) and the resistance static contact (23) are positioned on the same side of the main fracture (28).

2. Arc chute according to claim 1, characterized in that the transmission mechanism comprises a transmission rod (26) and a connecting rod (25), the connecting rod (25) being connected between the active contact (20) and the resistive moving contact (24), the transmission rod (26) being connected in an intermediate position of the connecting rod (25).

3. The arc extinguish chamber according to claim 1 or 2, characterized in that the arc extinguish chamber comprises a fixed end support (13), a movable end support (14) and an insulating support, wherein the insulating support is connected between the fixed end support (13) and the movable end support (14), a closing resistor (18) is arranged on one side of the fixed end support (13) opposite to the movable end support (14), and a main static contact (19) is arranged on one side of the fixed end support (13) opposite to the movable end support (14); the active contact (20) and the resistance moving contact (24) are both assembled on the moving end support (14) in a guiding and sliding way.

4. Arc chute according to claim 3, characterized in that said insulating support is an insulating rod (17).

5. The arc extinguish chamber according to claim 3, characterized in that a conductive cylinder (22) is arranged on the closing resistor (18), the return spring is a compression spring (21) arranged in the conductive cylinder (22), the resistance static contact (23) is assembled in the conductive cylinder (22) in a guiding and sliding manner and is pressed against the compression spring (21), and an avoidance hole is arranged on the static end support (13) and is used for avoiding the conductive cylinder (22).

6. The circuit breaker, including circuit breaker casing and explosion chamber, the explosion chamber setting is in the circuit breaker casing, the explosion chamber includes:

the main circuit of the opening and closing switch is provided with an active contact (20) and a main static contact (19), and a main fracture (28) is formed between the active contact (20) and the main static contact (19);

the opening and closing resistance branch circuit is arranged in parallel with the opening and closing main circuit, a resistance moving contact (24) and a resistance static contact (23) are arranged on the opening and closing resistance branch circuit, and a resistance fracture (29) is formed between the resistance moving contact (24) and the resistance static contact (23);

the return spring is used for applying elastic acting force for forcing the resistance static contact (23) to return;

the transmission mechanism is in transmission connection with the active contact (20) and the resistance moving contact (24), and the transmission mechanism, the active contact (20) and the resistance moving contact (24) are positioned on the same side of the main fracture (28);

it is characterized by also comprising:

and the closing resistor (18) is in conductive connection with the main static contact (19) and the resistance static contact (23), and the closing resistor (18), the main static contact (19) and the resistance static contact (23) are positioned on the same side of the main fracture (28).

7. The circuit breaker according to claim 6, characterized in that said transmission mechanism comprises a transmission rod (26) and a connecting rod (25), the connecting rod (25) being connected between the active contact (20) and the resistive moving contact (24), the transmission rod (26) being connected in an intermediate position of the connecting rod (25).

8. The circuit breaker according to claim 6 or 7, wherein the arc extinguishing chamber comprises a fixed end support (13), a movable end support (14) and an insulating support, the insulating support is connected between the fixed end support (13) and the movable end support (14), the closing resistor (18) is arranged on the side of the fixed end support (13) opposite to the movable end support (14), and the main static contact (19) is arranged on the side of the fixed end support (13) facing the movable end support (14); the active contact (20) and the resistance moving contact (24) are both assembled on the moving end support (14) in a guiding and sliding way.

9. The circuit breaker according to claim 8, characterized in that said insulating support is an insulating rod (17).

10. The circuit breaker according to claim 8, wherein a conductive cylinder (22) is disposed on the closing resistor (18), the return spring is a compression spring (21) disposed in the conductive cylinder (22), the resistance static contact (23) is slidably mounted in the conductive cylinder (22) and pressed against the compression spring (21), and an avoiding hole is disposed on the static end support (13) and used for avoiding the conductive cylinder (22).

Technical Field

The invention relates to a circuit breaker and an arc extinguish chamber.

Background

The electric network of 363kV and above voltage class is switched on when the amplitude of the power supply voltage is opposite to the residual voltage of the line, because of the sudden change of system parameters, the oscillation of the electromagnetic energy on the electric network can cause larger overvoltage, in order to limit the switching-on overvoltage, partial electric energy in the electric network is absorbed and converted into heat energy by using a switching-on resistor, so that the purposes of weakening the electromagnetic oscillation and limiting the overvoltage are achieved, and the electric equipment of the electric network is protected. When the breaker is switched on, the break of the switching-on resistor needs to be switched on in a loop before the main break for tens of milliseconds, and the switching-on resistor is disconnected and withdrawn after the main break is switched on, so that the purpose of limiting overvoltage is achieved; when the break of the closing resistor is in opening, the break of the closing resistor needs to be separated before the break of the main resistor, and the closing resistor does not work during opening.

The patent of the invention, chinese patent with granted publication number CN106024505B, discloses an arc extinguishing chamber, which comprises a main opening and closing circuit and an opening and closing resistance branch circuit, wherein the main opening and closing circuit and the opening and closing resistance branch circuit are arranged in parallel, the main opening and closing circuit is provided with a driving contact and a main static contact, and a main fracture is formed between the driving contact and the main static contact; a resistance moving contact and a resistance static contact are arranged on the opening and closing resistance branch, a reset spring is sleeved on the resistance static contact, a resistance fracture is formed between the resistance moving contact and the resistance static contact, and the resistance fracture and the main fracture are arranged in parallel in the axial direction of the arc extinguish chamber; and a closing resistor is also arranged on the switching-on and switching-off resistor branch circuit and is conductively connected between the active contact and the resistor moving contact. During switching on, the resistor fracture is closed before the main fracture, and instantaneous overcurrent generated in the switching on process is dissipated because the switching on resistor is changed into heat; when the brake is switched off, the reset spring is reset slowly under the action of the damping, so that the resistance moving contact and the resistance static contact are separated from contact instantly, and the resistance fracture is ensured to be disconnected with the main fracture firstly.

Because the electrically conductive connection of closing resistor is between initiative contact and resistance moving contact, consequently closing resistor is in same one side of main fracture with actuating mechanism, and the radial dimension that leads to the explosion chamber like this is great, under the unchangeable condition of insulating distance between explosion chamber and circuit breaker casing, the size of circuit breaker casing also can increase, is unfavorable for the miniaturized design of circuit breaker.

Disclosure of Invention

The invention aims to provide an arc extinguish chamber, which aims to solve the technical problem that the radial size of the arc extinguish chamber is larger because a closing resistor and a driving mechanism are positioned at the same side of a main fracture in the prior art; the invention also aims to provide a circuit breaker.

In order to achieve the purpose, the technical scheme of the arc extinguish chamber is as follows:

an arc chute, comprising:

the main opening and closing circuit is provided with a driving contact and a main static contact, and a main fracture is formed between the driving contact and the main static contact;

the opening and closing resistance branch circuit is arranged in parallel with the opening and closing main circuit, a resistance moving contact and a resistance static contact are arranged on the opening and closing resistance branch circuit, and a resistance fracture is formed between the resistance moving contact and the resistance static contact;

the return spring is used for applying elastic acting force for forcing the resistance static contact to return;

the transmission mechanism is in transmission connection with the active contact and the resistance moving contact, and the transmission mechanism, the active contact and the resistance moving contact are positioned on the same side of the main fracture;

further comprising:

and the closing resistor is electrically connected with the main static contact and the resistor static contact, and the closing resistor, the main static contact and the resistor static contact are positioned on the same side of the main fracture.

The beneficial effects are that: according to the arc extinguish chamber, on the basis of realizing the switching-on first closing and the switching-off first opening of the switching-on resistor, the switching-on resistor and the transmission mechanism are arranged on the two sides of the fracture, so that the radial size of the arc extinguish chamber can be reduced, the size of the shell of the circuit breaker is correspondingly reduced under the condition that the insulation distance between the arc extinguish chamber and the shell of the circuit breaker is not changed, and the miniaturization design of the circuit breaker is facilitated.

As a further improvement, the transmission mechanism comprises a transmission rod and a connecting rod, the connecting rod is connected between the active contact and the resistance moving contact, and the transmission rod is connected to the middle position of the connecting rod.

The beneficial effects are that: by the design, the active contact and the resistance moving contact are stressed the same, and the active contact and the resistance moving contact are driven to act.

As a further improvement, the arc extinguish chamber comprises a static end support, a movable end support and an insulating support, the insulating support is connected between the static end support and the movable end support, the closing resistor is arranged on one side of the static end support, which is back to the movable end support, and the main static contact is arranged on one side of the static end support, which is towards the movable end support; the active contact and the resistance moving contact are both assembled on the moving end support in a guiding and sliding mode.

As a further improvement, the insulating support is an insulating rod.

The beneficial effects are that: the insulating rod not only supports and moves the end support to quiet end and plays support and insulating action, and the metal fillings that produce because of the friction drop to the particle trapper when the clearance between the adjacent insulating rod supplies the divide-shut brake in addition to avoid influencing the normal work of explosion chamber.

As a further improvement, a conductive cylinder is arranged on the closing resistor, the reset spring is a pressure spring arranged in the conductive cylinder, the resistor static contact is assembled in the conductive cylinder in a guiding and sliding manner and is pressed on the pressure spring in a propping manner, and a yielding hole is arranged on the static end support and is used for yielding the conductive cylinder.

The beneficial effects are that: by the design, the compression spring is ensured not to bend in the stretching process.

In order to achieve the purpose, the technical scheme of the circuit breaker is as follows:

the circuit breaker, including circuit breaker casing and explosion chamber, the explosion chamber setting is in the circuit breaker casing, the explosion chamber includes:

the main opening and closing circuit is provided with a driving contact and a main static contact, and a main fracture is formed between the driving contact and the main static contact;

the opening and closing resistance branch circuit is arranged in parallel with the opening and closing main circuit, a resistance moving contact and a resistance static contact are arranged on the opening and closing resistance branch circuit, and a resistance fracture is formed between the resistance moving contact and the resistance static contact;

the return spring is used for applying elastic acting force for forcing the resistance static contact to return;

the transmission mechanism is in transmission connection with the active contact and the resistance moving contact, and the transmission mechanism, the active contact and the resistance moving contact are positioned on the same side of the main fracture;

further comprising:

and the closing resistor is electrically connected with the main static contact and the resistor static contact, and the closing resistor, the main static contact and the resistor static contact are positioned on the same side of the main fracture.

The beneficial effects are that: according to the arc extinguish chamber, on the basis of realizing the switching-on first closing and the switching-off first opening of the switching-on resistor, the switching-on resistor and the transmission mechanism are arranged on the two sides of the fracture, so that the radial size of the arc extinguish chamber can be reduced, the size of the shell of the circuit breaker is correspondingly reduced under the condition that the insulation distance between the arc extinguish chamber and the shell of the circuit breaker is not changed, and the miniaturization design of the circuit breaker is facilitated.

As a further improvement, the transmission mechanism comprises a transmission rod and a connecting rod, the connecting rod is connected between the active contact and the resistance moving contact, and the transmission rod is connected to the middle position of the connecting rod.

The beneficial effects are that: by the design, the active contact and the resistance moving contact are stressed the same, and the active contact and the resistance moving contact are driven to act.

As a further improvement, the arc extinguish chamber comprises a static end support, a movable end support and an insulating support, the insulating support is connected between the static end support and the movable end support, the closing resistor is arranged on one side of the static end support, which is back to the movable end support, and the main static contact is arranged on one side of the static end support, which is towards the movable end support; the active contact and the resistance moving contact are both assembled on the moving end support in a guiding and sliding mode.

As a further improvement, the insulating support is an insulating rod.

The beneficial effects are that: the insulating rod not only supports and moves the end support to quiet end and plays support and insulating action, and the metal fillings that produce because of the friction drop to the particle trapper when the clearance between the adjacent insulating rod supplies the divide-shut brake in addition to avoid influencing the normal work of explosion chamber.

As a further improvement, a conductive cylinder is arranged on the closing resistor, the reset spring is a pressure spring arranged in the conductive cylinder, the resistor static contact is assembled in the conductive cylinder in a guiding and sliding manner and is pressed on the pressure spring in a propping manner, and a yielding hole is arranged on the static end support and is used for yielding the conductive cylinder.

The beneficial effects are that: by the design, the compression spring is ensured not to bend in the stretching process.

Drawings

FIG. 1 is a schematic structural diagram of an arc extinguishing chamber of the present invention in an open position;

fig. 2 is a schematic structural view of the contact between the resistive moving contact and the resistive stationary contact in fig. 1;

fig. 3 is a schematic structural view of the active contact and the main stationary contact in fig. 2;

fig. 4 is a schematic structural diagram of the separation of the resistance moving contact and the resistance fixed contact in fig. 3;

in the figure: 11. a stationary end conductor; 12. a moving end conductor; 13. a static end support; 14. supporting the movable end; 15. shielding a static end; 16. shielding the moving end; 17. an insulating rod; 18. a closing resistor; 19. a main static contact; 20. an active contact; 21. a pressure spring; 22. a conductive barrel; 23. a resistor static contact; 24. a resistance moving contact; 25. a connecting rod; 26. a transmission rod; 27. a guide cylinder; 28. a main fracture; 29. and (4) breaking the resistor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. Furthermore, the terms "front", "back", "upper", "lower", "left" and "right" are based on the orientations and positional relationships shown in the drawings and are only for convenience in describing the present invention, but do not indicate that the referred device or component must have a specific orientation, and thus, should not be construed as limiting the present invention.

The features and properties of the present invention are described in further detail below with reference to examples.

Example 1 of the arc chute of the invention:

as shown in fig. 1, the arc extinguish chamber comprises a switching-on and switching-off main circuit and a switching-on and switching-off resistance branch circuit, wherein the switching-on and switching-off main circuit and the switching-on and switching-off resistance branch circuit are arranged in parallel; a main static contact 19 and a main active contact 20 are arranged on the main switching-on and switching-off circuit, and the main static contact 19 and the main active contact 20 are arranged at intervals along the left-right direction to form a main fracture 28 between the main static contact and the active contact; and a resistance moving contact 24 and a resistance static contact 23 are arranged on the opening and closing resistance branch, and the resistance static contact 23 and the resistance moving contact 24 are arranged at intervals along the left and right directions to form a resistance fracture 29 between the resistance moving contact and the resistance static contact. The main interruption 28 is spaced apart from the resistor interruption 29.

In this embodiment, the main stationary contact 19 and the active contact 20 are in a contact finger insertion structure, and opposite ends of the resistance stationary contact 23 and the resistance movable contact 24 are in a spherical structure.

In this embodiment, the explosion chamber still includes quiet end support 13, move end support 14 and insulating rod 17, insulating rod 17 has arranged a plurality ofly, all insulating rod 17 are connected and are being held 13 and move between end support 14 at quiet end, insulating rod 17 not only supports 13 and moves end support 14 and play support and insulating action to quiet end, and the metal fillings that produce because of the friction drop to the particle trapper in the clearance between the adjacent insulating rod 17 supplies the divide-shut brake in addition to avoid influencing the normal work of explosion chamber. Wherein the insulating rod 17 constitutes an insulating support.

In this embodiment, the edge of the fixed end support 13 is provided with a fixed end shield 15, and the edge of the movable end support 14 is provided with a movable end shield 16, so as to uniform the electric field at the main fracture 28 and the resistor fracture 29.

In this embodiment, the left side of the static end support 13 is provided with a static end conductor 11 and a closing resistor 18, and the main static contact 19 is arranged on the right side of the static end support 13; the right side of the moving end support 14 is provided with a moving end conductor 12, and a driving contact 20 and a resistance moving contact 24 are slidably assembled on the moving end support 14 along the left-right direction. Wherein, the left side of the moving end support 14 is provided with a guide cylinder 27, and the guide cylinder 27 is used for guiding the resistance moving contact 24.

As shown in fig. 1, the active contact 20 and the resistive moving contact 24 are in transmission connection with a transmission mechanism, that is, the transmission mechanism, the active contact 20 and the resistive moving contact 24 are located on the right side of the main break 28; the transmission mechanism comprises a transmission rod 26 and a connecting rod 25, the connecting rod 25 is connected between the active contact 20 and the resistance moving contact 24, and the transmission rod 26 is connected to the middle position of the connecting rod 25, so that the active contact 20 and the resistance moving contact 24 are stressed the same, and the driving of the active contact 20 and the resistance moving contact 24 is facilitated. Wherein, the driving rod 26 is connected with the operating mechanism in a driving way, and the connecting rod 25 is hinged with the driving contact 20, the resistance moving contact 24 and the driving rod 26.

As shown in fig. 1, the closing resistor 18 is electrically connected to the main stationary contact 19 and the resistive stationary contact 23, that is, the closing resistor 18, the main stationary contact 19, and the resistive stationary contact 23 are located on the left side of the main fracture 28. In this embodiment, one end of the closing resistor 18 is connected to the stationary end support 13 to realize the conductive connection with the main stationary contact 19; the other end of the closing resistor 18 is provided with a conductive cylinder 22, a pressure spring 21 is arranged in the conductive cylinder 22, a static resistor contact 23 is assembled in the conductive cylinder 22 in a guiding sliding manner and is pressed against the pressure spring 21, and the pressure spring 21 is used for applying an elastic acting force for resetting the static resistor contact 23; be equipped with on the quiet end support 13 and dodge the hole, dodge the hole and be used for dodging conductive tube 22, and dodge and be equipped with safe insulating distance between the pore wall in hole and conductive tube 22.

Before switching on, as shown in fig. 1, after the operating mechanism receives a switching on command, the transmission rod 26 simultaneously pushes the active contact 20 and the resistive moving contact 24 to move leftward through the connection rod 25, and since the opening distance of the resistive fracture 29 is smaller than the opening distance of the main fracture 28, as shown in fig. 2, the resistive moving contact 24 and the resistive fixed contact 23 are firstly switched on and switched on, at this time, current is connected into the switching on resistor 18 to form a series structure, and part of electric energy in the power grid is absorbed and converted into heat energy by the switching on resistor 18, so that electromagnetic oscillation can be weakened, and switching on overvoltage can be limited.

After the resistor fracture 29 is switched on, the transmission rod 26 continues to push the active contact 20 and the resistor moving contact 24 to move leftward, as shown in fig. 3, the resistor static contact 23 compresses the compression spring 21 to move leftward until the main fracture 28 and the resistor fracture 29 are both in a switched-on state, and the circuit breaker is switched on. At this point, the opening and closing resistor branch is shorted by the opening and closing main circuit, and the closing resistor 18 no longer functions in the circuit.

During opening, after the operating mechanism receives an opening command, the driving rod 26 pulls the driving contact 20 and the resistance moving contact 24 to move rightwards at the same time, because the opening speed of the circuit breaker is very high, the resistance moving contact 24 moves rightwards at a high speed, and the resistance static contact 23 can only move rightwards at a low speed due to the acting force of spring-air damping, so that the resistance moving contact 24 and the resistance static contact 23 are firstly opened, and the closing resistor 18 exits from the loop, as shown in fig. 4; then, the active contact 20 and the resistive moving contact 24 continue to move to the right, and then the active contact 20 and the main stationary contact 19 are opened. If the circuit breaker is provided with high voltage, an electric arc occurs between the active contact 20 and the main static contact 19, and the electric arc is cut off through the main fracture 28, so that the purpose of cutting off rated current and various fault currents is achieved. Finally, the opening is finished and the state of the figure 1 is recovered.

Example 2 of the arc chute of the invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, the transmission mechanism includes a transmission rod 26 and a connecting rod 25, the connecting rod 25 is connected between the active contact 20 and the resistive moving contact 24, and the transmission rod 26 is connected to the middle position of the connecting rod 25, so that the active contact 20 and the resistive moving contact 24 are stressed the same, which is beneficial to driving the active contact 20 and the resistive moving contact 24 to move. In this embodiment, the transmission mechanism employs a main operating lever and a transmission lever as disclosed in the publication No. CN 106024505B.

Example 3 of the arc chute of the invention:

this embodiment is different from embodiment 1 in that in embodiment 1, the insulating support is an insulating rod 17. In this embodiment, the insulating support is an insulating cylinder.

Example 4 of the arc chute of the invention:

the difference between this embodiment and embodiment 1 is that in embodiment 1, a conductive cylinder 22 is disposed on the closing resistor 18, a pressure spring 21 is disposed in the conductive cylinder 22, a fixed resistor contact 23 is slidably mounted in the conductive cylinder 22 in a guiding manner and is pressed against the pressure spring 21, and the pressure spring 21 is used for applying an elastic acting force to the fixed resistor contact 23 to reset the fixed resistor contact. In this embodiment, based on the condition that the conductive barrel is disposed on the closing resistor, the static contact of the resistor is slidably assembled in the conductive barrel in a guiding manner, and a pressure spring is sleeved on the static contact of the resistor between the spherical head and the conductive barrel and is used for applying an elastic acting force to the static contact of the resistor to reset the static contact of the resistor.

In the embodiment of the circuit breaker of the present invention, the circuit breaker includes a circuit breaker housing and an arc extinguish chamber, the arc extinguish chamber is disposed in the circuit breaker housing, and the arc extinguish chamber has the same structure as any one of embodiments 1 to 4 of the arc extinguish chamber, and is not described herein again.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.