Arc extinguishing system and circuit breaker

Abstract

The invention relates to the technical field of electrical equipment, in particular to an arc extinguishing system and a circuit breaker. The arc extinguishing system comprises a contact assembly and an arc striking assembly, the contact assembly comprises a main active contact, an arc moving contact, a main static contact and an arc static contact, an active contact point on the main active contact can be in contact with or separated from the main static contact, an arc moving contact point on the arc moving contact can be in contact with or separated from the arc static contact, and the main static contact point on the arc moving contact can be in contact with or separated from the arc static contact. The main static contact and the arc static contact are arranged in an electric isolation manner; the arc striking assembly comprises a conductive coil and a mounting shell, the conductive coil comprises a winding part and two connecting parts extending out of the two ends of the winding part respectively, the winding part is arranged in the mounting shell, and the two connecting parts extend out of the mounting shell and are connected to the main static contact and the arc static contact respectively. When the circuit is disconnected, the conductive coil can form a magnetic field force for driving the electric arc to move towards the direction far away from the contact assembly, so that the electric arc is effectively and quickly pulled towards the direction far away from the contact assembly, and a better arc extinguishing effect is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to an arc extinguishing system and a circuit breaker. BACKGROUND

[0002] At present, the breaking voltage requirement of the circuit breaker has reached 2000V, and high voltage and direct current are an important challenge currently faced. With the increase of voltage, the arc generated during breaking of the circuit breaker is difficult to extinguish, and according to the existing test conditions, the main reason is that the arc cannot completely enter the arc extinguishing chamber.

[0003] In order to solve the problem of slow speed of the arc entering the arc extinguishing chamber, some circuit breakers are provided with magnets on the arc extinguishing chamber, and some circuit breakers drive the arc to leave the contact through the magnetic field force generated by the loop current. For example, Chinese patent CN201210059219.X discloses an upper line-in static contact device of a molded case circuit breaker, which forms a nearly annular conductive loop on both sides of the moving contact through the upper line-in static contact, and pushes the arc into the arc extinguishing chamber through the magnetic blowing force formed by the conductive loop; in the above structure, the magnetic blowing force received by the arc during the transfer is mainly provided by the magnetic field generated by the two bending surfaces nearly parallel to the arc, and this structure cannot meet the requirement of high voltage breaking. The structure of adding magnets on the arc extinguishing chamber will lead to the increase of the volume of the arc extinguishing chamber, and the magnetic blowing force provided by the magnets is small, which cannot meet the requirement of high voltage breaking.

[0004] Therefore, how to effectively and quickly pull the arc towards the direction away from the contact assembly to achieve better arc extinguishing effect is a problem to be solved by the person skilled in the art. SUMMARY

[0005] The first object of the present application is to provide an arc extinguishing system to effectively and quickly pull the arc towards the direction away from the contact assembly to achieve better arc extinguishing effect.

[0006] In order to achieve the above object, the present application adopts the following technical scheme:

[0007] An arc extinguishing system, comprising:

[0008] A contact assembly comprising a main moving contact, an arc moving contact, a main static contact and an arc static contact, a main moving contact point on the main moving contact being capable of contacting or separating from the main static contact, an arc moving contact point on the arc moving contact being capable of contacting or separating from the arc static contact, the main static contact and the arc static contact being arranged in electrical isolation;

[0009] The arc striking assembly comprises a conducting coil and a mounting shell, the conducting coil comprises a winding part and two connecting parts respectively extending from two ends of the winding part, the winding part is arranged in the mounting shell, and the two connecting parts extend from the mounting shell and are respectively connected to the main static contact and the arc static contact; the conducting coil can form a magnetic field force driving the arc to move away from the contact assembly.

[0010] Further, in the projection pattern along the axial direction of the conducting coil, the movement path of the arc moving contact is at least partially located in the inner ring range of the conducting coil.

[0011] Further, wherein: the winding part is arranged on one side of the contact assembly along the axial direction of the arc moving contact;

[0012] Or, one end of the winding part is arranged opposite to the movable end of the arc moving contact along the axial direction of the winding part.

[0013] Further, the number of the arc striking assemblies is two, and the two arc striking assemblies are respectively arranged on opposite sides of the contact assembly along the axial direction of the arc moving contact.

[0014] Further, the cross-sectional outer contour of the conducting coil is polygonal; the conducting coil comprises a first straight line segment and a second straight line segment, the first straight line segment and the second straight line segment are respectively located on opposite sides of the arc along the radial direction; the current directions in the first straight line segment and the second straight line segment are opposite.

[0015] Further, the winding part is arranged on one side of the contact assembly along the axial direction of the arc moving contact, the main moving contact and the arc moving contact are located on the left side of the main static contact and the arc static contact; one end of the conducting coil is connected to the main static contact, and the other end extends in a counterclockwise direction and is connected to the arc static contact.

[0016] Further, one end of the winding part is arranged opposite to the movable end of the arc moving contact along the axial direction of the winding part, the arc moving contact is located on one side of the main moving contact, and the arc moving contact is located in front of the conducting coil; one end of the conducting coil is connected to the main static contact, and the other end extends in a clockwise direction and is connected to the arc static contact.

[0017] Further, the arc striking assembly comprises one or more conducting coils, each conducting coil is arranged on one side of the arc static contact away from the arc moving contact;

[0018] The arc moving contact is located on the left side of the arc static contact; one end of each conducting coil is connected to the main static contact, and the other end extends in a clockwise direction and is connected to the arc static contact.

[0019] Further, the winding part comprises at least one coil unit; when the winding part comprises a plurality of coil units, the plurality of coil units are sequentially arranged along the axial direction of the winding part or the plurality of coil units are sequentially sleeved from the inside to the outside.

[0020] Further, the bottom of the mounting shell is provided with at least one set of clamping groove groups distributed along the circumferential direction of the mounting shell, each set of clamping groove groups comprises at least one clamping groove; the winding part is in clamping fit with the clamping groove groups.

[0021] Further, the two connecting parts are respectively inserted into the main static contact and the arc static contact.

[0022] Further, the main static contact is provided with a notch, and the arc static contact is arranged in the notch.

[0023] Further, the arc striking assembly further comprises an iron core arranged in the conductive coil.

[0024] Further, an arc extinguishing chamber is further included, the arc extinguishing chamber comprises a set of grid fins; the conductive coil can form a magnetic field force for driving the electric arc to move from the contact assembly to the arc extinguishing chamber.

[0025] Further, the mounting shell has an opening, the arc striking assembly further comprises a cover plate covering the opening of the mounting shell, the cover plate is provided with through holes for the two connecting parts to pass through; the cover plate is connected to one side of the set of grid fins.

[0026] Further, the arc extinguishing chamber further comprises a moving arc striking fin and a static arc striking fin arranged at two ends of the set of grid fins respectively; the middle part of the moving arc striking fin is recessed to form a V-shaped protrusion towards the static arc striking fin near the position of the arc extinguishing chamber, the middle part of the static arc striking fin is recessed to form a V-shaped protrusion towards the moving arc striking fin near the position of the arc extinguishing chamber, and the tips of the two V-shaped protrusions are oppositely arranged.

[0027] Further, the cross-sectional outer contour of the conductive coil is circular, elliptical or polygonal.

[0028] The second object of the present application is to provide a circuit breaker comprising the arc extinguishing system according to any one of the above.

[0029] The beneficial effects of the present application are as follows:

[0030] The application provides an arc extinguishing system and a circuit breaker, and the arc extinguishing system comprises a contact assembly and an arc ignition assembly, wherein: the contact assembly comprises a driving contact, an arc driving contact, a driving static contact and an arc static contact, a driving contact point on the driving contact is capable of contacting or separating from the driving static contact, an arc driving contact point on the arc driving contact is capable of contacting or separating from the arc static contact, and the driving static contact and the arc static contact are arranged in electrical isolation; the arc ignition assembly comprises a conducting coil and a mounting shell, the conducting coil comprises a winding part and two connecting parts respectively extending from two ends of the winding part, the winding part is arranged in the mounting shell, and the two connecting parts extend out of the mounting shell and are respectively connected to the driving static contact and the arc static contact; the conducting coil is capable of forming a magnetic field force for driving the electric arc to move away from the contact assembly.

[0031] In use, when the circuit is disconnected (i.e. when the circuit breaker is tripped or tripped), the conducting coil is capable of forming a magnetic field force for driving the electric arc to move away from the contact assembly, so that the electric arc is effectively and quickly pulled away from the contact assembly, and a better arc extinguishing effect is achieved. In addition, the mounting shell is arranged, which can insulate and protect the winding part, thereby improving the safety performance of the system during operation; and the mounting of the conducting coil is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 A three-dimensional structural schematic diagram of the arc extinguishing system (without an arc extinguishing chamber) provided by the first embodiment of the application;

[0034] Figure 2 A working principle schematic diagram of the arc extinguishing system (without an arc extinguishing chamber) provided by the first embodiment of the application Figure 1 ;

[0035] Figure 3 A working principle schematic diagram of the arc extinguishing system (without an arc extinguishing chamber) provided by the first embodiment of the application Figure 2 ;

[0036] Figure 4 A three-dimensional structural schematic diagram of the arc extinguishing system (with an arc extinguishing chamber) provided by the first embodiment of the application;

[0037] Figure 5 A forward structural schematic diagram of the arc extinguishing system (with an arc extinguishing chamber) provided by the first embodiment of the application;

[0038] Figure 6 Fig. 2 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application; Figure 1 Fig. 3 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0039] Figure 7 Fig. 4 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0040] Figure 8 Fig. 5 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0041] Figure 9 Fig. 6 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0042] Figure 10 Fig. 7 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0043] Figure 11 Fig. 8 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0044] Figure 12 Fig. 9 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0045] Figure 13 Fig. 10 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0046] Figure 14 Fig. 11 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0047] Figure 15 Fig. 12 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0048] Figure 16 Fig. 13 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0049] Figure 17 Fig. 14 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0050] Figure 18 Fig. 15 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0051] Figure 19 Fig. 16 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application;

[0052] Figure 20 Fig. 17 is a schematic view of the arc extinguishing system of the present application according to an embodiment of the present application; and

[0053] Figure 21 Schematic view of the arrangement of the plurality of conductive coils provided for the sixth embodiment of the present application;

[0054] Figure 22 Schematic view of the assembly structure of the contact assembly and the arc striking assembly provided for the sixth embodiment of the present application;

[0055] Figure 23 Schematic view of the three-dimensional structure of the arc striking assembly provided for the sixth embodiment of the present application.

[0056] Icon:

[0057] 1-Contact assembly; 11-Active contact; 111-Active contact point; 12-Arc moving contact; 121-Arc moving contact point; 13-Primary static contact; 131-Notch; 14-Arc static contact; 15-Insulating mounting base; 151-Isolating protrusion;

[0058] 2-Arc striking assembly; 21-Conductive coil; 211-Winding part; 2111-First straight line segment; 2112-Second straight line segment; 212-Connecting part; 22-Mounting shell; 221-Slot group; 222-Core limiting slot; 223-U-shaped plate; 23-Cover plate; 24-Core;

[0059] 3-Arc extinguishing chamber; 31-Lattice piece group; 32-Moving arc striking piece; 33-Static arc striking piece. DETAILED DESCRIPTION

[0060] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0061] It should be noted that in the description of the present application, the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0062] It should be noted that in the description of the present application, the terms "connection" and "installation" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection, it can be direct connection, or connection through intermediate medium, it can be mechanical connection, or electrical connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0063] The present application provides an arc extinguishing system, referring to Figures 1 to 3 , the arc extinguishing system comprises:

[0064] The contact assembly 1 comprises a driving contact 11, an arc driving contact 12, a main static contact 13 and an arc static contact 14, the driving contact point 111 on the driving contact 11 can be in contact or separated from the main static contact 13, the arc driving contact point 121 on the arc driving contact 12 can be in contact or separated from the arc static contact 14, and the main static contact 13 and the arc static contact 14 are arranged in electrical isolation.

[0065] The arc ignition assembly 2 comprises a conducting coil 21 and a mounting shell 22, the conducting coil 21 comprises a winding part 211 and two connecting parts 212 respectively extending from both ends of the winding part 211, the winding part 211 is arranged in the mounting shell 22, and the two connecting parts 212 extend from the mounting shell 22 and are respectively connected to the main static contact 13 and the arc static contact 14; the conducting coil 21 can form a magnetic field force driving the electric arc to move away from the contact assembly 1.

[0066] In the use process of the above-mentioned arc extinguishing system, when the circuit is disconnected (i.e. when the circuit breaker is tripped or tripped), the driving contact 11 and the main static contact 13 are separated before the arc driving contact 12 and the arc static contact 14, the arc driving contact point 121 moves away from the arc static contact 14, and at the same time, an electric arc is formed along the movement path of the arc driving contact point 121; at this time, the conducting coil 21 can form a magnetic field force driving the electric arc to move away from the contact assembly 1, so as to effectively and quickly pull the electric arc away from the contact assembly 1, and achieve better arc extinguishing effect. In addition, the setting of the mounting shell 22 can insulate and protect the winding part 211, and improve the safety performance of the system in the working process; on the other hand, it is convenient for the installation and positioning of the conducting coil 21.

[0067] Further, the main static contact 13 and the arc static contact 14 are arranged in isolation, so that they are electrically isolated.

[0068] Referring to Figure 4 and Figure 5The arc extinguishing system further comprises an arc extinguishing chamber 3, and the conductive coil 21 can form a magnetic field force to drive the arc to move from the contact assembly 1 to the arc extinguishing chamber 3. Specifically, the arc extinguishing chamber 3 comprises a grid group 31, a moving arc guiding piece 32 and a static arc guiding piece 33, and the moving arc guiding piece 32 and the static arc guiding piece 33 are respectively arranged at two ends of the grid group 31, wherein: the end of the moving arc guiding piece 32 away from the grid group 31 extends towards the moving contact 12; and the end of the static arc guiding piece 33 away from the grid group 31 is connected to the static contact 14.

[0069] After the circuit is disconnected, the arc is subjected to a Lorentz force in the magnetic field formed by the conductive coil 21, and the Lorentz force is directed from the contact assembly 1 to the arc extinguishing chamber 3, so that the arc is accelerated into the arc extinguishing chamber 3 under the influence of the Lorentz force and is rapidly extinguished under the cutting of the grid group 31.

[0070] As an optional embodiment, the arc extinguishing chamber 3 can further be provided with a gas generating member, and under the combined action of the gas blowing force generated by the gas generating member and the magnetic blowing force generated by the conductive coil 21, the speed of the arc entering the arc extinguishing chamber 3 is greatly improved.

[0071] As an optional embodiment, the active contact 11 comprises at least one active contact piece; when the active contact 11 comprises a plurality of active contact pieces, the plurality of active contact pieces are arranged side by side. The moving contact 12 comprises at least one moving contact piece; when the moving contact 12 comprises a plurality of moving contact pieces, the plurality of moving contact pieces are arranged side by side.

[0072] As an optional embodiment, the cross-sectional outer contour of the conductive coil 21 is circular or elliptical or polygonal. The conductive coil 21 can be a single-turn or multi-turn coil, and the cross-sectional shape of each turn of the coil can be the same or different, which is not limited herein. In addition, the conductive coil 21 can be wound by cylindrical or prismatic conductive wires, which is not limited herein.

[0073] As an optional embodiment, the arc guiding assembly 2 further comprises a core 24 arranged in the conductive coil 21. The core 24 can be magnetized by the magnetic field formed by the conductive coil 21, thereby enhancing the magnetic field strength and further accelerating the transfer of the arc.

[0074] The present application will be described in detail in the following with several specific embodiments.

[0075] Embodiment one

[0076] The embodiment one of the present application provides an arc extinguishing system, referring to Figure 2 and Figure 3 In the projection pattern along the axial direction of the conductive coil 21, the movement path of the moving contact 121 is at least partially located in the inner ring range of the conductive coil 21, and the conductive coil 21 can form a magnetic field force to drive the arc in the inner ring range of the conductive coil 21 to move in the direction away from the contact assembly 1.

[0077] On the basis of the above structure, in the projection pattern along the axis direction of the conductive coil 21, the movement path of the arc moving contact 121 is all located within the inner ring range of the conductive coil 21, thus the electric arc is all located within the inner ring range of the conductive coil 21, so that each position of the electric arc is subjected to the magnetic field force moving in the direction away from the contact assembly 1, which is beneficial to the overall movement of the electric arc in the direction away from the contact assembly 1.

[0078] Optionally, the angle between the central axis of the conductive coil 21 and the electric arc (i.e. the movement path of the arc moving contact 121) is less than or equal to 90° and greater than or equal to 45°. Preferably, the angle between the central axis of the conductive coil 21 and the electric arc is less than or equal to 90° and greater than or equal to 80°.

[0079] It can be understood that when the central axis of the conductive coil 21 and the movement path of the arc moving contact 121 are arranged at an acute angle, the arc striking function can also be achieved; but when they are substantially perpendicular, no additional component force is generated, and the arc striking effect is best.

[0080] In the embodiment, the active contact 11 and the arc moving contact 12 are arranged side by side and rotate around the same rotation axis, and the active contact 11 and the arc moving contact 12 are respectively contacted or separated from the main static contact 13 and the arc static contact 14 through the rotation movement; the winding part 211 is arranged on one side of the contact assembly 1 along the rotation axis direction of the arc moving contact 12, and the axis of the winding part 211 is substantially parallel to the rotation axis. When the active contact 11 and the arc moving contact 12 are located on the left side of the main static contact 13 and the arc static contact 14, one end of the conductive coil 21 is connected to the main static contact 13, and the other end extends in the counterclockwise direction and is connected to the arc static contact 14.

[0081] The working principle of the above-mentioned arc extinguishing system is as follows:

[0082] Referring to Figure 2 When the current flows from the static contact to the active contact, after the circuit is disconnected, the current sequentially flows through the main static contact 13, the conductive coil 21, the arc static contact 14, the electric arc and the arc moving contact 12 to form a current loop; at this time, a magnetic field perpendicular to the paper surface and outward is formed in the coil of the conductive coil 21, and the electric arc is subjected to an upward Lorentz force in the magnetic field, so that the electric arc is accelerated to move in the direction away from the contact assembly 1 under the influence of the Lorentz force;

[0083] Referring to Figure 3When the current flows from the moving contact to the static contact, after the circuit is disconnected, the current flows through the arc moving contact 12, the electric arc, the arc static contact 14, the conductive coil 21 and the main static contact 13 in turn, forming a current loop; at this time, a magnetic field perpendicular to the paper and inward is formed in the coil of the conductive coil 21, and the electric arc is still subjected to the upward Lorentz force in the magnetic field, so that the electric arc moves away from the contact assembly 1 under the influence of the Lorentz force.

[0084] Therefore, the arc extinguishing system provided by the application can realize bidirectional non-polarity arc extinguishing.

[0085] Referring to Figure 4 and Figure 5 In this embodiment, the inlet of the arc extinguishing chamber 3 is arranged opposite to the contact assembly 1; the two side walls of the arc extinguishing chamber 3 are provided with gas generating members, and under the joint action of the gas blowing force generated by the gas generating members and the magnetic blowing force generated by the conductive coil 21, the speed of the electric arc entering the arc extinguishing chamber 3 is greatly improved.

[0086] Referring to Figure 6 , the main static contact 13 is provided with a notch 131, and the arc static contact 14 is arranged in the notch 131, and the arc static contact 14 and the inner wall of the notch 131 have a gap; the gap can be filled with an insulating material (such as an insulating plate), and through the insulating material in the gap, on the one hand, the isolation effect between the main static contact 13 and the arc static contact 14 can be enhanced, and on the other hand, the relative position of the main static contact 13 and the arc static contact 14 can be fixed.

[0087] Further, the two connecting parts 212 are respectively inserted into the main static contact 13 and the arc static contact 14. Specifically, the main static contact 13 and the arc static contact 14 are both provided with connecting holes for inserting the connecting parts 212, and the ends of the two connecting parts 212 away from the winding part 211 are respectively inserted into the connecting holes on the main static contact 13 and the arc static contact 14. In this embodiment, the conductive coil 21 and the contact assembly 1 adopt a plug-in connection mode, which improves the reliability of the electrical connection between them, and at the same time makes the overall structure of the system compact and occupies small space.

[0088] In other embodiments, the two connecting parts 212 can be connected to the main static contact 13 and the arc static contact 14 respectively by screws or other fasteners or welding; in addition, the two ends of the conductive coil 21 can also be connected to the main static contact 13 and the arc static contact 14 respectively through wires.

[0089] Continuing to refer to Figure 5 , Figure 5In the shown embodiment, the cross-sectional outer contour of the conductive coil 21 is polygonal; the conductive coil 21 comprises a first straight section 2111 and a second straight section 2112, the first straight section 2111 and the second straight section 2112 are respectively located on opposite sides of the arc along the radial direction; the current directions in the first straight section 2111 and the second straight section 2112 are opposite. In the above structure, the first straight section 2111 and the second straight section 2112 are respectively substantially parallel to the arc, wherein: the current direction in the first straight section 2111 is the same as the direction of the arc, so there is an attractive force between them; the current direction in the second straight section 2112 is opposite to the direction of the arc, so there is a repulsive force between them. Under the attractive force of the first straight section 2111 and the repulsive force of the second straight section 2112, the arc is more likely to move away from the contact assembly 1.

[0090] On the basis of the above structure, the first straight section 2111 is arranged on the side of the arc close to the arc-extinguishing chamber 3, specifically, the first straight section 2111 can be located between the arc and the arc-extinguishing chamber 3, or on the side of the arc-extinguishing chamber 3 away from the arc, or at least partially coincides with the projection of the arc-extinguishing chamber 3 in the axial direction of the conductive coil 21; the second straight section 2112 is arranged on the side of the arc away from the arc-extinguishing chamber 3. In the above structure, under the attractive force of the first straight section 2111 and the repulsive force of the second straight section 2112, the arc is more likely to move towards the arc-extinguishing chamber 3.

[0091] Embodiment two

[0092] Embodiment two of the present application provides an arc-extinguishing system, the main difference between the arc-extinguishing system in embodiment one and the arc-extinguishing system is that the structure of the conductive coil 21 is different.

[0093] Referring to Figure 7 and Figure 8 In this embodiment, the winding part 211 comprises a plurality of coil units which are sequentially sleeved from inside to outside. In the above structure, the winding part 211 extends in a spiral shape, which can increase the number of turns of the coil without increasing the axial length of the conductive coil 21, thereby enhancing the magnetic field strength, so that the arc-extinguishing system has the advantages of good arc-extinguishing effect and small size.

[0094] Referring to Figure 9 and Figure 10 The shell bottom of the mounting shell 22 is provided with at least one set of clamping groove groups 221 distributed along the circumference of the mounting shell 22, each set of clamping groove groups 221 comprises at least one clamping groove; the winding part 211 is connected with the clamping groove groups 221 by clamping. In this embodiment, the winding part 211 is fixed in the mounting shell 22 by the clamping connection mode.

[0095] Specifically, each group of clamping groove group 221 includes a plurality of clamping grooves arranged in sequence from inside to outside, the winding part 211 includes a plurality of coil units arranged in a spiral shape from inside to outside, and each clamping groove is clamped with one of the coil units; the iron core 24 is clamped at the center of the plurality of group of clamping groove groups 221.

[0096] Exemplarily, the shell bottom of the mounting shell 22 is provided with three groups of clamping groove groups 221 uniformly distributed along the circumference of the mounting shell 22, and the winding part 211 is clamped in the mounting shell 22 through the clamping groove groups 221. Under the limiting of the clamping groove groups 221, the conductive coil 21 is not easy to shake, which improves the stability of the arc extinguishing system during use; in addition, a single clamping groove can separate two adjacent coil units, compared with the technical solution of coating insulating paint only on the outer periphery of the coil, the embodiment can avoid the problem of short circuit of adjacent coil units caused by damage of the insulating paint, so that the arc extinguishing system can work safely and reliably for a long time.

[0097] Referring to Figure 11 , the mounting shell 22 has an opening, and the arc striking assembly 2 further includes a cover plate 23 covering the opening of the mounting shell 22, and the cover plate 23 is provided with through holes for the two connecting parts 212 to pass out. The winding part 211 is arranged in the closed space formed by the mounting shell 22 and the cover plate 23, and the two connecting parts 212 pass out from the through holes on the cover plate 23 and are connected to the contact assembly 1.

[0098] On the basis of the above structure, the mounting shell 22 and the cover plate 23 are both provided with connecting through holes, and during installation, the arc striking assembly 2 is fixed in the circuit breaker mounting shell through the connecting through holes.

[0099] The arc striking assembly 2 provided by the embodiment has a small and compact overall structure, greatly improves the transfer speed of the electric arc without increasing the volume of the arc extinguishing system, and has the advantages of easy disassembly, safety and reliability during use, and high practicability.

[0100] Embodiment three

[0101] The arc extinguishing system provided by the embodiment three is an extension based on the embodiments one and two.

[0102] Referring to Figure 12 and Figure 13 , in the embodiment, the number of arc striking assemblies 2 is two, and the two arc striking assemblies 2 are arranged on the opposite sides of the contact assembly 1 along the rotation axis direction of the arc moving contact 12; through the magnetic field superposition formed by the two arc striking assemblies 2, the magnetic field force received by the electric arc is further increased.

[0103] Embodiment four

[0104] Embodiment 4 of the present invention provides an arc extinguishing system, which is an extension of Embodiments 2 and 3.

[0105] Reference Figure 14 In this embodiment, in the projected pattern along the axial direction of the conductive coil 21, the grid assembly 31 and the conductive coil 21 partially overlap. In the above structure, the grid assembly 31 is partially located within the inner ring of the conductive coil 21. After the electric arc enters the grid assembly 31, the conductive coil 21 can continue to provide a magnetic force that drives the electric arc deeper into the grid assembly 31. Furthermore, due to the mutual cancellation of the magnetic forces of multiple coil units, the influence of the magnetic force in the region between the inner and outer rings of the conductive coil 21 on the electric arc is negligible.

[0106] Reference Figure 15 and Figure 16 The cover plate 23 is connected to one side of the grid assembly 31. Specifically, there are two arc-starting components 2, and the opposite sides of the grid assembly 31 are respectively connected to the two cover plates 23, that is, the two cover plates 23 serve as the two side walls of the arc-extinguishing chamber 3. The cover plate 23 can be made of gas-generating material, which serves as the gas-generating component on the arc-extinguishing chamber 3; or, a gas-generating component is installed on the cover plate 23.

[0107] Optionally, each grid plate in the grid plate group 31 is inserted into two cover plates 23 on both sides. In this embodiment, the grid plate and cover plate 23 are connected in a conventional grid plate fixing method, which will not be described in detail here.

[0108] In this embodiment, the arc-extinguishing chamber 3 and two arc-initiating components 2 are integrated into one unit. The arc-initiating components 2 can not only perform the function of initiating the arc, but also act as the side wall of the arc-extinguishing chamber 3. Therefore, the arc-extinguishing performance of the arc-extinguishing system is greatly improved without increasing the volume and cost of the arc-extinguishing system.

[0109] Example 5

[0110] Embodiment 5 of the present invention provides an arc extinguishing system, referring to... Figure 17 In this embodiment, one end of the conductive coil 21 along its own axis is positioned opposite to the movable end of the arcing contact 12; in the projection pattern along the axis of the conductive coil 21, the movement path of the arcing contact is at least partially located within the inner ring of the conductive coil 21, that is, the electric arc generated when the circuit is disconnected is at least partially located within the inner ring of the conductive coil 21.

[0111] Reference Figure 18, the projection of the active contact 11 and the grid group 31 along the axis direction of the conductive coil 21 at least partially coincide; when the arc active contact 12 is located at the side of the active contact 11, and the arc active contact 12 is located in front of the conductive coil 21, one end of the conductive coil 21 is connected to the main static contact 13, and the other end extends in a clockwise direction and is connected to the arc static contact 14. The arc extinguishing system provided by the embodiment can also realize bidirectional non-polarity arc extinguishing, and the principle will not be described again.

[0112] It should be noted that in the projection pattern along the axis direction of the conductive coil 21, the movement path of the arc active contact can also be located at the outer peripheral portion of the conductive coil 21; since the magnetic field directions inside and outside the conductive coil 21 are opposite, the rotation direction of the conductive coil 21 also needs to be adjusted accordingly. Those skilled in the art can make corresponding modifications according to the above description, which will not be described here.

[0113] Further, the middle part of the arc active contact 12 near the arc extinguishing chamber is recessed to form a V-shaped protrusion towards the arc static contact 14, and the middle part of the arc static contact 14 near the arc extinguishing chamber is recessed to form a V-shaped protrusion towards the arc active contact 12, and the tips of the two V-shaped protrusions are oppositely arranged. The above structure is conducive to guiding the arc into the grid group 31, further increasing the arc guiding effect.

[0114] Further, the cross-sectional outer contour of the conductive coil 21 is oval or rectangular, and the long axis of the oval or the long side of the rectangle is parallel to the arrangement direction of the grids in the grid group 31. After the circuit is disconnected, since the long axis of the oval or the long side of the rectangle is parallel to the arrangement direction of the grids in the grid group 31, the grids located at both ends of the grid group 31 can be fully utilized, thereby improving the utilization rate of the grids.

[0115] Reference Figure 19 The contact assembly 1 further comprises an insulating mounting seat 15 made of insulating material, and the main static contact 13 and the arc static contact 14 are arranged side by side and spaced apart on the insulating mounting seat 15. The insulating mounting seat 15 is provided with a separation protrusion 151 located between the main static contact 13 and the arc static contact 14, and the separation effect between the main static contact 13 and the arc static contact 14 can be enhanced through the separation protrusion 151.

[0116] Further, the bottom of the mounting shell 22 is provided with a through hole for the two connecting portions 212 to extend out, and one end of the two connecting portions 212 extending out of the mounting shell 22 is bent to extend to the main static contact 13 and the arc static contact 14. A plurality of insertion slots are arranged side by side on the outer side wall of the mounting shell 22, and the grids in the grid group 31 correspond to the insertion slots one by one and are inserted and matched, thereby limiting the relative position of the mounting shell 22 and the grid group 31, and improving the structural strength of the arc extinguishing chamber 3.

[0117] Embodiment six

[0118] The sixth embodiment of the present application provides an arc extinguishing system, referring to Figure 20 In the embodiment, the arc striking assembly 2 comprises at least one conductive coil 21, and each conductive coil 21 is arranged on the side of the arc stationary contact 14 away from the arc movable contact 12. The conductive coil 21 is arranged as close to the stationary contact as possible, so as to connect the conductive coil 21 between the main stationary contact 13 and the arc stationary contact 14, while reducing the occupied space of the arc striking assembly 2 as much as possible.

[0119] Continuing to refer to Figure 20 When the arc movable contact 12 is on the left side of the arc stationary contact 14, one end of each conductive coil 21 is connected to the main stationary contact 13, and the other end spirally extends in the clockwise direction and is connected to the arc stationary contact 14.

[0120] Optionally, the number of conductive coils 21 is multiple, and the multiple conductive coils 21 are arranged in series and / or in parallel.

[0121] As an optional first embodiment, the multiple conductive coils 21 are arranged in series, and the multiple conductive coils 21 are distributed in the radial direction in sequence. As an optional second embodiment, the multiple conductive coils 21 are arranged in parallel, and the multiple conductive coils 21 are distributed in the radial direction or the axial direction in sequence. As an optional third embodiment, referring to Figure 21 , the multiple conductive coils 21 are arranged in series to form a group of coil groups, and the multiple groups of coil groups are arranged in parallel. The conductive coils 21 in each group of coil groups can be distributed in the radial direction in sequence, and the multiple groups of coil groups can be distributed in the axial direction in sequence.

[0122] In the above embodiments, the magnetic field formed by the multiple conductive coils 21 is superimposed, further increasing the magnetic blowing force on the electric arc.

[0123] Referring to Figure 22 , the outer wall surface of the mounting shell 22 is provided with a U-shaped plate 223, and the arc stationary contact 14, the U-shaped plate 223 and the notch 131 are sequentially sleeved. In the above structure, the arc stationary contact 14 is partially covered in the U-shaped plate 223. This arrangement not only ensures the electrical isolation between the main stationary contact 13 and the arc stationary contact 14, but also improves the installation strength of the arc stationary contact 14, making the overall installation structure of the system stable and reliable.

[0124] Referring to Figure 23 , the inner wall surfaces of the two sides of the mounting shell 22 along the length direction are provided with iron core limiting grooves 222, and the two ends of the iron core 24 are respectively inserted into the two iron core limiting grooves 222; the mounting shell 22 is also provided with a through groove for the connection part 212 to pass through.

[0125] Continuing to refer to Figure 23In the illustrated embodiment, the number of the conductive coils 21 is two, and the two conductive coils 21 are arranged in parallel and coaxially sleeved on the iron core 24. The arc striking assembly 2 provided by the embodiment has a small and compact overall structure, and makes full use of the space at the back of the static contact, without increasing the volume of the arc extinguishing system.

[0126] Embodiment Seven

[0127] The circuit breaker provided by the embodiment seven of the present application comprises the arc extinguishing system provided by any of the above embodiments. The circuit breaker has all the technical effects of the arc extinguishing system, which will not be repeated here.

[0128] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features, such as the spiral direction of the coil, the number of turns of the coil, and whether there is an iron core or not; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An arc quenching system, characterized in that, The application relates to an arc striking assembly and a contact assembly. The contact assembly (1) comprises a driving contact (11), an arc driving contact (12), a main static contact (13) and an arc static contact (14), the driving contact (11) is capable of contacting or separating from the main static contact (13), the arc driving contact (12) is capable of contacting or separating from the arc static contact (14), and the main static contact (13) and the arc static contact (14) are arranged in an electrically isolated mode. The arc striking assembly (2) comprises a conductive coil (21) and a mounting shell (22), the conductive coil (21) comprises a winding part (211) and two connecting parts (212) respectively extending from two ends of the winding part (211), the winding part (211) is arranged in the mounting shell (22), and the two connecting parts (212) extend out of the mounting shell (22) and are connected to the main static contact (13) and the arc static contact (14) respectively; the conductive coil (21) is capable of forming a magnetic field force for driving an electric arc to move in a direction away from the contact assembly (1).

2. The quenching system of claim 1, wherein, In a projection pattern along an axial direction of the conductive coil (21), a movement path of the arc driving contact (121) is at least partially located in an inner ring range of the conductive coil (21).

3. The quenching system of claim 2, wherein, The winding part (211) is arranged on one side of the contact assembly (1) along an axial direction of the arc driving contact (12). The winding part (211) is arranged on one side of the contact assembly (1) along an axial direction of the arc driving contact (12). The number of the arc striking assemblies (2) is two, and the two arc striking assemblies (2) are arranged on opposite sides of the contact assembly (1) along an axial direction of the arc driving contact (12).

4. The quenching system of claim 3, wherein, The conductive coil (21) has a polygonal cross-section outer contour; the conductive coil (21) comprises a first straight line segment (2111) and a second straight line segment (2112), the first straight line segment (2111) and the second straight line segment (2112) are respectively located on opposite sides of the electric arc along a radial direction, and the current directions in the first straight line segment (2111) and the second straight line segment (2112) are opposite.

5. The quenching system of claim 3, wherein, The winding part (211) is arranged on one side of the contact assembly (1) along an axial direction of the arc driving contact (12), the driving contact (11) and the arc driving contact (12) are located on a left side of the main static contact (13) and the arc static contact (14), one end of the conductive coil (21) is connected to the main static contact (13), and the other end of the conductive coil (21) extends in a counterclockwise direction and is connected to the arc static contact (14).

6. The quenching system of claim 3, wherein, ​ 7. The quenching system of claim 3, wherein, The winding part (211) is arranged opposite to the movable end of the arc moving contact (12) along the direction of its own axis, the arc moving contact (12) is located on the side of the driving contact (11), and the arc moving contact (12) is located in front of the conductive coil (21); one end of the conductive coil (21) is connected to the main static contact (13), and the other end extends in a clockwise direction and is connected to the arc static contact (14).

8. The quenching system of claim 1, wherein, The arc igniting assembly (2) comprises one or more conductive coils (21), and each conductive coil (21) is arranged on the side of the arc static contact (14) away from the arc moving contact (12). The arc moving contact (12) is located on the left side of the arc static contact (14); one end of each conductive coil (21) is connected to the main static contact (13), and the other end extends in a clockwise direction and is connected to the arc static contact (14).

9. The quenching system according to any one of claims 1 to 8, characterized in that The winding part (211) comprises at least one coil unit; when the winding part (211) comprises a plurality of coil units, the plurality of coil units are arranged in sequence along the axial direction of the winding part (211) or the plurality of coil units are sequentially sleeved from the inside to the outside.

10. The quenching system of claim 9, wherein, The bottom of the mounting shell (22) is provided with at least one set of clamping groove groups (221) distributed along the circumference of the mounting shell (22), each clamping groove group (221) comprises at least one clamping groove; the winding part (211) is in clamping fit with the clamping groove group (221).

11. The quenching system according to any one of claims 1 to 8, characterized in that Two connection parts (212) are respectively inserted into the main static contact (13) and the arc static contact (14).

12. The quenching system according to any one of claims 1 to 8, characterized in that The main static contact (13) is provided with a notch (131), and the arc static contact (14) is arranged in the notch (131).

13. The quenching system according to any one of claims 1 to 8, characterized in that The arc igniting assembly (2) further comprises an iron core (24) arranged in the conductive coil (21).

14. The quenching system of any one of claims 1 to 8, wherein, Further comprising an arc extinguishing chamber (3) comprising a grid group (31); the conductive coil (21) can form a magnetic field force to drive the arc to move from the contact assembly (1) to the arc extinguishing chamber (3).

15. The quenching system of claim 14, wherein, The mounting shell (22) has an opening, and the arc igniting assembly (2) further comprises a cover plate (23) covering the opening of the mounting shell (22), the cover plate (23) is provided with through holes for the two connection parts (212) to pass through; the cover plate (23) is connected to one side of the grid group (31).

16. The arc extinguishing system of claim 14, wherein, The arc extinguishing chamber (3) further comprises a moving arc igniting sheet (32) and a static arc igniting sheet (33) arranged at both ends of the grid group (31) respectively; the middle part of the moving arc igniting sheet (32) is recessed to form a V-shaped protrusion towards the static arc igniting sheet (33) near the arc extinguishing cavity, and the middle part of the static arc igniting sheet (33) is recessed to form a V-shaped protrusion towards the moving arc igniting sheet (32) near the arc extinguishing cavity, and the tips of the two V-shaped protrusions are oppositely arranged.

17. The quenching system of any one of claims 1 to 8, wherein, The cross-sectional outline of the conductive coil (21) is circular, elliptical or polygonal.

18. A circuit breaker characterized by, An arc extinguishing system comprising the arc extinguishing system according to any one of claims 1 to 17.

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