Arc extinguishing system and circuit breaker

Abstract

The utility model 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 utility model relates to the technical field of electrical equipment, and particularly relates to an arc extinguishing system and a circuit breaker. Background Art

[0002] At present, the requirement for the breaking voltage of the circuit breaker has reached 2000V, and high voltage and direct current are an important challenge currently faced. As the voltage increases, the arc generated during the breaking of the circuit breaker is very difficult to extinguish. According to the existing test situation, the main reason is that the arc fails to 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 away from the contact by the magnetic force generated by the loop current. For example, the application number CN201210059219.X discloses an upper-inlet static contact device of a molded case circuit breaker. This device forms a nearly annular conductive loop on both sides of the moving contact through the upper-inlet static contact, and the magnetic blowing force formed by the conductive loop is used to push the arc into the arc extinguishing chamber. In the above structure, the magnetic blowing force received by the arc during the transfer process is mainly provided by the magnetic field generated by two bending surfaces that are nearly parallel to the arc. This structure cannot meet the requirements of high-voltage breaking. And the structure of adding a magnet on the arc extinguishing chamber will cause the volume of the arc extinguishing chamber to increase, and the magnetic blowing force provided by the magnet is small, which also cannot meet the requirements of high-voltage breaking.

[0004] Therefore, how to effectively and quickly pull the arc in the direction away from the contact assembly to achieve a better arc extinguishing effect is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

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

[0006] In order to achieve the above object, the utility model adopts the following technical solutions:

[0007] An arc extinguishing system, comprising:

[0008] A contact assembly, including a main moving contact, an arc moving contact, a main static contact and an arc static contact. The main contact on the main moving contact can contact or separate from the main static contact. The arc contact on the arc moving contact can contact or separate from the arc static contact. The main static contact and the arc static contact are electrically isolated.

[0009] The arc ignition component includes a conductive coil and a mounting shell. The conductive coil includes a winding portion and two connecting portions respectively extending from both ends of the winding portion. The winding portion is disposed within the mounting shell, and the two connecting portions extend out of the mounting shell and are respectively connected to the main static contact and the arc static contact. The conductive coil can form a magnetic field force that drives the arc to move away from the contact component.

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

[0011] Further, where: the winding portion is disposed on one side of the contact component along the rotation axis direction of the arc moving contact;

[0012] Or, one end of the winding portion along its own axis is disposed opposite to the movable end of the arc moving contact.

[0013] Further, the number of the arc ignition components is two, and the two arc ignition components are respectively disposed on opposite sides of the contact component along the rotation axis direction of the arc moving contact.

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

[0015] Further, the winding portion is disposed on one side of the contact component along the rotation axis 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 conductive coil is connected to the main static contact, and the other end extends spirally in the counterclockwise direction and is connected to the arc static contact.

[0016] Further, one end of the winding portion along its own axis is disposed opposite to the movable end of the arc moving contact, 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 conductive coil; one end of the conductive coil is connected to the main static contact, and the other end extends spirally in the clockwise direction and is connected to the arc static contact.

[0017] Further, the arc ignition component includes one or more of the conductive coils, and each conductive coil is disposed on the 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 conductive coil is connected to the main static contact, and the other end extends spirally in the clockwise direction and is connected to the arc static contact.

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

[0020] Further, at least one set of card slot groups distributed along the circumferential direction of the mounting shell is arranged on the bottom of the mounting shell, and each set of the card slot groups includes at least one card slot; the winding part is in clamping fit with the card slot groups.

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

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

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

[0024] Further, an arc extinguishing chamber is further included, and the arc extinguishing chamber includes a grid sheet group; the conductive coil can form a magnetic field force that drives the arc to move from the contact assembly to the arc extinguishing chamber.

[0025] Further, the mounting shell has an opening, and the arc ignition assembly further includes a cover plate covering the opening of the mounting shell, and through holes for allowing the two connecting parts to pass through are arranged on the cover plate; the cover plate is connected to one side of the grid sheet group.

[0026] Further, the arc extinguishing chamber further includes a moving arc ignition piece and a static arc ignition piece respectively arranged at two ends of the grid sheet group; a V-shaped protrusion is formed by the middle part of the moving arc ignition piece near the arc extinguishing cavity being recessed towards the static arc ignition piece, a V-shaped protrusion is formed by the middle part of the static arc ignition piece near the arc extinguishing cavity being recessed towards the moving arc ignition piece, and the tips of the two V-shaped protrusions are arranged opposite to each other.

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

[0028] The second object of the present utility model is to provide a circuit breaker, including the arc extinguishing system described in any one of the above.

[0029] The beneficial effects of the present utility model:

[0030] The present utility model provides an arc extinguishing system and a circuit breaker. The arc extinguishing system includes a contact assembly and an arc leading assembly, wherein: The contact assembly includes a moving main contact, a moving arc contact, a static main contact and a static arc contact. The moving contact on the moving main contact can contact or separate from the static main contact, and the moving contact on the moving arc contact can contact or separate from the static arc contact. The static main contact and the static arc contact are electrically isolated; The arc leading assembly includes a conductive coil and a mounting shell. The conductive coil includes a winding part and two connecting parts respectively extending from both ends of the winding part. The winding part is arranged inside the mounting shell, and the two connecting parts extend out of the mounting shell and are respectively connected to the static main contact and the static arc contact; The conductive coil can form a magnetic field force that drives the arc to move away from the contact assembly 1.

[0031] During the use of the above arc extinguishing system, when the circuit is disconnected (i.e., when the circuit breaker trips or releases), the conductive coil can form a magnetic field force that drives the arc to move away from the contact assembly, so as to effectively and quickly pull the arc away from the contact assembly, achieving a better arc extinguishing effect. In addition, the setting of the mounting shell can, on the one hand, provide insulation protection for the winding part, improving the safety performance of the system during operation; on the other hand, it facilitates the installation and positioning of the conductive coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a three-dimensional structure diagram of the arc extinguishing system (without arc chamber) provided in Embodiment 1 of the present utility model;

[0034] Figure 2 It is a schematic diagram of the working principle of the arc extinguishing system (without arc chamber) provided in Embodiment 1 of the present utility model Figure 1 ;

[0035] Figure 3 It is a schematic diagram of the working principle of the arc extinguishing system (without arc chamber) provided in Embodiment 1 of the present utility model Figure 2 ;

[0036] Figure 4 It is a three-dimensional structure diagram of the arc extinguishing system (with arc chamber) provided in Embodiment 1 of the present utility model;

[0037] Figure 5 It is a front structure diagram of the arc extinguishing system (with arc chamber) provided in Embodiment 1 of the present utility model;

[0038] Figure 6 For Figure 1 An enlarged view at position A;

[0039] Figure 7 A three-dimensional structure diagram of the arc extinguishing system (without arc extinguishing chamber) provided in the second embodiment of the present utility model;

[0040] Figure 8 A front view structure diagram of the arc extinguishing system (without arc extinguishing chamber) provided in the second embodiment of the present utility model;

[0041] Figure 9 A three-dimensional structure diagram of the arc extinguishing system (without arc extinguishing chamber) with an installation shell provided in the second embodiment of the present utility model;

[0042] Figure 10 An internal structure diagram of the installation shell provided in the second embodiment of the present utility model;

[0043] Figure 11 A three-dimensional structure diagram of the arc ignition component provided in the second embodiment of the present utility model;

[0044] Figure 12 A three-dimensional structure diagram of the arc extinguishing system (without arc extinguishing chamber) provided in the third embodiment of the present utility model;

[0045] Figure 13 A schematic diagram of the positional relationship of the conductive coils in two arc ignition components provided in the third embodiment of the present utility model;

[0046] Figure 14 A front view structure diagram of the arc extinguishing system (without installation shell and cover plate) provided in the fourth embodiment of the present utility model;

[0047] Figure 15 A top view structure diagram of the arc extinguishing system provided in the fourth embodiment of the present utility model;

[0048] Figure 16 A schematic diagram of the installation structure of one of the arc ignition components and the arc extinguishing chamber provided in the fourth embodiment of the present utility model;

[0049] Figure 17 A three-dimensional structure diagram of the arc extinguishing system at an angle provided in the fifth embodiment of the present utility model;

[0050] Figure 18 A projection schematic diagram along the axial direction of the conductive coil of the arc extinguishing system provided in the fifth embodiment of the present utility model;

[0051] Figure 19 A three-dimensional structure diagram of the arc extinguishing system at another angle provided in the fifth embodiment of the present utility model;

[0052] Figure 20 3D structural schematic diagram of the arc extinguishing system provided in the sixth embodiment of the present utility model;

[0053] Figure 21 Arrangement schematic diagram of a plurality of conductive coils provided in the sixth embodiment of the present utility model;

[0054] Figure 22 Assembly structural schematic diagram of the contact assembly and the arc ignition assembly provided in the sixth embodiment of the present utility model;

[0055] Figure 23 3D structural schematic diagram of the arc ignition assembly provided in the sixth embodiment of the present utility model.

[0056] Icon:

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

[0058] 2 - Arc ignition assembly; 21 - Conductive coil; 211 - Winding part; 2111 - First straight segment; 2112 - Second straight segment; 212 - Connection part; 22 - Mounting shell; 221 - Card slot group; 222 - Iron core limiting slot; 223 - U - shaped plate; 23 - Cover plate; 24 - Iron core;

[0059] 3 - Arc extinguishing chamber; 31 - Grid sheet group; 32 - Moving arc ignition sheet; 33 - Static arc ignition sheet. Detailed implementation manners

[0060] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0061] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] It should be noted that in the description of the present utility model, the terms "connection" and "installation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0063] The present utility model provides an arc extinguishing system. Referring to Figures 1 to 3 , the arc extinguishing system includes:

[0064] A contact assembly 1, including a main moving contact 11, an arc moving contact 12, a main static contact 13, and an arc static contact 14. The main contact point 111 on the main moving contact 11 can contact or separate from the main static contact 13. The arc contact point 121 on the arc moving contact 12 can contact or separate from the arc static contact 14. The main static contact 13 and the arc static contact 14 are electrically isolated.

[0065] An arc ignition assembly 2, including a conductive coil 21 and a mounting shell 22. The conductive coil 21 includes 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 inside the mounting shell 22. The two connecting parts 212 extend out of the mounting shell 22 and are respectively connected to the main static contact 13 and the arc static contact 14. The conductive coil 21 can form a magnetic field force that drives the arc to move away from the contact assembly 1.

[0066] During the use of the above arc extinguishing system, when the circuit is disconnected (i.e., when the circuit breaker trips or releases), the main moving contact 11 and the main static contact 13 separate before the arc moving contact 12 and the arc static contact 14. The arc contact point 121 moves away from the arc static contact 14. At the same time, an arc is formed along the movement path of the arc contact point 121. At this time, the conductive coil 21 can form a magnetic field force that drives the arc to move away from the contact assembly 1, so as to effectively and quickly pull the arc away from the contact assembly 1 and achieve a better arc extinguishing effect. In addition, the setting of the mounting shell 22 can, on the one hand, provide insulation protection for the winding part 211 and improve the safety performance of the system during operation; on the other hand, it facilitates the installation and positioning of the conductive coil 21.

[0067] Furthermore, the main static contact 13 and the arc static contact 14 are arranged at intervals to electrically isolate them from each other.

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

[0069] After the circuit is disconnected, the arc is affected by the Lorentz force pointing from the contact assembly 1 to the arc extinguishing chamber 3 within the magnetic field formed by the conductive coil 21. Thus, under the influence of the arc Lorentz force, the arc accelerates into the arc extinguishing chamber 3 and is quickly extinguished under the cutting of the grid plate group 31.

[0070] As an alternative embodiment, a gas generating component can be provided on the arc extinguishing chamber 3. Under the combined action of the gas blowing force generated by the gas generating component and the magnetic blowing force generated by the conductive coil 21, the speed at which the arc enters the arc extinguishing chamber 3 is greatly increased.

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

[0072] As an alternative embodiment, the outer contour of the cross-section of the conductive coil 21 is circular or elliptical or polygonal. The conductive coil 21 can be a single-turn or multi-turn coil. At the same time, the cross-sectional shape of each turn of the coil can be the same or different, and no limitation is made here. In addition, the conductive coil 21 can be wound with a cylindrical or prismatic wire, and no limitation is made here either.

[0073] As an alternative embodiment, the arc guiding assembly 2 further includes an iron core 24 arranged inside the conductive coil 21. The iron core 24 can be magnetized by the magnetic field formed by the conductive coil 21, thereby enhancing the magnetic field intensity and further accelerating the transfer of the arc.

[0074] The following uses several specific embodiments to elaborate on the present utility model in detail.

[0075] Embodiment 1

[0076] Embodiment 1 of the present utility model provides an arc extinguishing system. Referring to Figure 2 and Figure 3 , in the present embodiment, in the projection graph along the axial direction of the conductive coil 21, at least part of the movement path of the moving arc contact 121 is located within the inner ring range of the conductive coil 21, and the conductive coil 21 can form a magnetic field force that drives the arc within the inner ring range of the conductive coil 21 to move away from the contact assembly 1.

[0077] Based on the above structure, in the projected figure along the axial direction of the conductive coil 21, the movement path of the arc moving contact 121 is entirely within the inner ring range of the conductive coil 21. Therefore, the electric arc is entirely within the inner ring range of the conductive coil 21, and thus each position of the electric arc is subjected to a magnetic force moving in a direction away from the contact assembly 1, which is beneficial for the overall movement of the electric arc in a 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 a certain acute angle, the arc ignition function can also be achieved; but when the two are substantially perpendicular, no additional component force will be generated, and the arc ignition effect is the best.

[0080] In this embodiment, the main moving contact 11 and the arc moving contact 12 are arranged side by side and both rotate around the same rotation axis. The main moving contact 11 and the arc moving contact 12 are in contact with or separated from the main static contact 13 and the arc static contact 14 respectively through rotational movement; the winding portion 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 portion 211 is substantially parallel to the rotation axis. When the main moving contact 11 and the arc moving contact 12 are 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 spirally in the counterclockwise direction and is connected to the arc static contact 14.

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

[0082] Refer to Figure 2 , when the current flows from the static contact to the moving contact, after the circuit is disconnected, the current successively 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 inside the conductive coil 21, and the electric arc is subjected to an upward Lorentz force in this magnetic field. Thus, under the influence of the Lorentz force, the electric arc accelerates and moves in a direction away from the contact assembly 1;

[0083] Refer to Figure 3When the current flows from the moving contact to the static contact, after the circuit is disconnected, the current successively 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, forming a current loop. At this time, a magnetic field perpendicular to the paper surface and inward is formed inside the conductive coil 21. The electric arc still receives an upward Lorentz force within this magnetic field. Thus, under the influence of the arc Lorentz force, the electric arc accelerates and moves away from the contact assembly 1.

[0084] Therefore, the arc extinguishing system provided by this application can achieve bidirectional non-polar arc extinguishing.

[0085] Refer to Figure 4 and Figure 5 In this embodiment, the inlet of the arc extinguishing chamber 3 and the contact assembly 1 are oppositely arranged. Gas generating components are arranged on both side walls of the arc extinguishing chamber 3. Under the combined action of the gas blowing force generated by the gas generating components 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 increased.

[0086] Refer to Figure 6 On the main static contact 13, there is a notch 131. The arc static contact 14 is arranged within the notch 131, and there is a gap between the arc static contact 14 and the inner wall of the notch 131. Insulating materials (such as insulating plates) can be filled in this gap. Through the insulating materials in this 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 positions of the main static contact 13 and the arc static contact 14 can be fixed.

[0087] Furthermore, the two connecting parts 212 are respectively inserted into the main static contact 13 and the arc static contact 14. Specifically, connection holes for inserting the connecting parts 212 are provided on both the main static contact 13 and the arc static contact 14. The ends of the two connecting parts 212 far from the winding part 211 are respectively inserted into the connection holes on the main static contact 13 and the connection holes on the arc static contact 14. In this embodiment, by adopting the plug-in connection method between the conductive coil 21 and the contact assembly 1, the reliability of the electrical connection between the two is improved, and at the same time, the overall structure of the system is compact and occupies a small space.

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

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

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

[0091] Embodiment II

[0092] The second embodiment of the present utility model provides an arc extinguishing system, and the main difference between this arc extinguishing system and the arc extinguishing system in Embodiment I is that: the structure of the conductive coil 21 is different.

[0093] Referring to Figure 7 and Figure 8 , in this embodiment, the winding portion 211 includes a plurality of coil units sleeved from the inside to the outside in sequence. In the above structure, the winding portion 211 extends in a spiral shape, so that the number of turns of the coil can be increased without increasing the axial length of the conductive coil 21, thereby enhancing the magnetic field strength, making the arc extinguishing system have the advantages of good arc extinguishing effect and small volume.

[0094] Referring to Figure 9 and Figure 10 , at least one set of slot groups 221 distributed along the circumferential direction of the mounting shell 22 is provided on the bottom of the mounting shell 22, and each set of slot groups 221 includes at least one slot; the winding portion 211 is in snap-fit connection with the slot groups 221. In this embodiment, the winding portion 211 is fixed in the mounting shell 22 by a snap-fit connection method.

[0095] Specifically, each set of card slot groups 221 includes a plurality of card slots arranged in sequence from the inside to the outside. The winding portion 211 includes a plurality of coil units arranged in a spiral shape from the inside to the outside. One of the coil units is clamped in each card slot; the iron core 24 is clamped at the center of multiple sets of card slot groups 221.

[0096] Exemplarily, three sets of card slot groups 221 evenly distributed along the circumferential direction of the mounting shell 22 are provided at the bottom of the mounting shell 22. The winding portion 211 is clamped in the mounting shell 22 through the card slot groups 221. Under the limitation of the card slot groups 221, the conductive coil 21 is not easy to shake, improving the stability of the arc extinguishing system during use; in addition, a single card slot can separate two adjacent coil units. Compared with the technical solution of only coating insulating paint on the outer periphery of the coil, this embodiment can avoid the problem of short circuit between adjacent coil units caused by the damage of the insulating paint, enabling the arc extinguishing system to work safely and reliably for a long time.

[0097] Refer to Figure 11 , the mounting shell 22 has an opening. The arc ignition assembly 2 further includes a cover plate 23 covering the opening of the mounting shell 22. Through holes for two connecting portions 212 to pass through are provided on the cover plate 23. The winding portion 211 is arranged in the enclosed space formed by the mounting shell 22 and the cover plate 23, and the two connecting portions 212 pass through the through holes on the cover plate 23 and are connected to the contact assembly 1.

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

[0099] The arc ignition assembly 2 provided in this embodiment has a small and compact overall structure. On the basis of hardly increasing the volume of the arc extinguishing system, the arc transfer speed is greatly improved; at the same time, the arc ignition assembly 2 also has the advantages of convenient disassembly, safety and reliability during use, etc., and has high practicability.

[0100] Embodiment Three

[0101] Embodiment Three of the present utility model provides an arc extinguishing system, which is an extended solution based on Embodiment One and Embodiment Two.

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

[0103] Embodiment Four

[0104] Embodiment 4 of the present utility model provides an arc extinguishing system, which is an extended solution based on Embodiments 2 and 3.

[0105] Referring to Figure 14 , in this embodiment, in the projection pattern along the axis direction of the conductive coil 21, the grid plate group 31 and the conductive coil 21 partially overlap. In the above structure, part of the grid plate group 31 is located within the inner ring range of the conductive coil 21. After the arc enters the grid plate group 31, the conductive coil 21 can continue to provide a magnetic field force to drive the arc deeper into the grid plate group 31; in addition, under the mutual cancellation of the magnetic field forces of multiple coil units, the influence of the magnetic field force in the area between the inner ring and the outer ring of the conductive coil 21 on the arc can be ignored.

[0106] Referring to Figure 15 and Figure 16 , the cover plate 23 is connected to one side of the grid plate group 31. Specifically, the number of arc ignition assemblies 2 is two, and the opposite sides of the grid plate group 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 part on the arc extinguishing chamber 3; or, a gas-generating part is installed on the cover plate 23.

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

[0108] In this embodiment, the arc extinguishing chamber 3 and the two arc ignition assemblies 2 are integrated. While the arc ignition assembly 2 functions as an arc igniter, it can also serve as the side wall of the arc extinguishing chamber 3. Therefore, without significantly increasing the volume and cost of the arc extinguishing system, the arc extinguishing performance of the arc extinguishing system is greatly improved.

[0109] Embodiment 5

[0110] Embodiment 5 of the present utility model provides an arc extinguishing system. Referring to Figure 17 , in this embodiment, one end of the conductive coil 21 along its own axis is disposed opposite to the movable end of the arc movable contact 12; in the projection pattern along the axis direction of the conductive coil 21, the movement path of the arc movable contact at least partially lies within the inner ring range of the conductive coil 21, that is, the arc generated when the circuit is disconnected at least partially lies within the inner ring range of the conductive coil 21.

[0111] Referring to Figure 18, the projection of the main moving contact 11 and the grid piece group 31 along the axis direction of the conductive coil 21 at least partially coincides; when the arcing moving contact 12 is located on one side of the main moving contact 11 and 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 spirally in the clockwise direction and is connected to the arcing static contact 14. The arc extinguishing system provided in this embodiment can also achieve bidirectional non-polar arc extinguishing, and the principle will not be elaborated here.

[0112] It should be noted that in the projection pattern along the axis direction of the conductive coil 21, the movement path of the arcing moving contact can also be located on the outer peripheral part of the conductive coil 21; since the magnetic field directions inside and outside the conductive coil 21 are opposite, the helix 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 records, which will not be elaborated here.

[0113] Furthermore, the middle part of the moving arc guiding piece 32 near the arc extinguishing chamber is recessed towards the static arc guiding piece 33 to form a V-shaped protrusion. At the same time, the middle part of the static arc guiding piece 33 near the arc extinguishing chamber is recessed towards the moving arc guiding piece 32 to form a V-shaped protrusion, and the tips of the two V-shaped protrusions are arranged opposite to each other. The above structure is beneficial to guiding the arc into the grid piece group 31, further increasing the arc guiding effect.

[0114] Furthermore, the outer contour of the cross-section of the conductive coil 21 is elliptical or rectangular, and the major axis of the ellipse or the long side of the rectangle is parallel to the arrangement direction of the grid pieces in the grid piece group 31. When the circuit is disconnected, since the major axis of the above ellipse or the long side of the rectangle is parallel to the arrangement direction of the grid pieces in the grid piece group 31, the grid pieces at both ends of the grid piece group 31 can be fully utilized, improving the utilization rate of the grid pieces.

[0115] Refer to Figure 19 , the contact assembly 1 further includes an insulating mounting seat 15 made of insulating material, and the main static contact 13 and the arcing static contact 14 are arranged side by side and spaced apart on the insulating mounting seat 15. An isolation protrusion 151 is provided on the insulating mounting seat 15 between the main static contact 13 and the arcing static contact 14, and the isolation effect between the main static contact 13 and the arcing static contact 14 can be enhanced through the isolation protrusion 151.

[0116] Furthermore, through holes for the two connecting parts 212 to extend out are provided at the bottom of the mounting shell 22, and one end of the two connecting parts 212 extending out from the mounting shell 22 is bent and extended to the main static contact 13 and the arcing static contact 14. A plurality of slots are arranged side by side on the outer side wall of the mounting shell 22, and the grid pieces in the grid piece group 31 correspond to the slots one by one and are inserted and matched, thereby restricting the relative positions of the mounting shell 22 and the grid piece group 31 and enhancing the structural strength of the arc extinguishing chamber 3.

[0117] Embodiment Six

[0118] Embodiment 6 of the present utility model provides an arc extinguishing system. Refer to Figure 20 . In this embodiment, the arc ignition assembly 2 includes at least one conductive coil 21, and each conductive coil 21 is disposed on the side of the arc static contact 14 away from the arc moving contact 12. When arranging the conductive coils 21, they are arranged as close as possible to the static contact, so as to facilitate connecting the conductive coils 21 between the main static contact 13 and the arc static contact 14, and at the same time, the occupied space of the arc ignition assembly 2 is reduced as much as possible.

[0119] Continue to refer to Figure 20 . When 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 spirally in the clockwise direction and is connected to the arc static 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 radially in sequence. As an optional second embodiment, the multiple conductive coils 21 are arranged in parallel, and the multiple conductive coils 21 are distributed radially or axially in sequence. As an optional third embodiment, refer to Figure 21 . The multiple conductive coils 21 are arranged in series to form a set of coil groups, and multiple sets of coil groups are arranged in parallel. The conductive coils 21 within each set of coil groups can be distributed radially in sequence, and multiple sets of coil groups can be distributed axially in sequence.

[0122] In the above embodiments, through the superposition of the magnetic fields formed by the multiple conductive coils 21, the magnetic blowing force received by the arc is further increased.

[0123] Refer to Figure 22 . A U-shaped plate 223 is disposed on the outer wall surface of the mounting shell 22, and the arc static contact 14, the U-shaped plate 223, and the notch 131 are sleeved in sequence. In the above structure, a part of the arc static contact 14 is wrapped in the U-shaped plate 223. This setting can not only ensure electrical isolation between the main static contact 13 and the arc static contact 14, but also improve the installation strength of the arc static contact 14, making the overall installation structure of the system stable and reliable.

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

[0125] Continue to refer to Figure 23, in 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 overall structure of the arc ignition assembly 2 provided in this embodiment is small and compact, making full use of the space on the back of the static contact, and hardly increasing the volume of the arc extinguishing system.

[0126] Embodiment Seven

[0127] Embodiment Seven of the present utility model provides a circuit breaker, which includes the arc extinguishing system provided in any of the above embodiments. This circuit breaker at least has all the technical effects of the above arc extinguishing system, and 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 utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features, such as changes in the spiral direction of the coil, the number of turns of the coil, and whether there is an iron core; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An arc extinguishing system, characterized in that: include: A contact assembly (1), comprising an active contact (11), an arc moving contact (12), a main static contact (13) and an arc static contact (14); an active contact (111) on the active contact (11) can contact or separate from the main static contact (13); an arc moving contact (121) on the arc moving contact (12) can contact or separate from the arc static contact (14); and the main static contact (13) and the arc static contact (14) are electrically isolated; An arc striking assembly (2) comprises a conductive coil (21) and a mounting shell (22), wherein the conductive coil (21) comprises a winding portion (211) and two connecting portions (212) extending from two ends of the winding portion (211), respectively, the winding portion (211) being arranged in the mounting shell (22), and the two connecting portions (212) extending from the mounting shell (22) and respectively connected to the main static contact (13) and the arc static contact (14); the conductive coil (21) is capable of forming a magnetic field force that drives the arc to move in a direction away from the contact assembly (1).

2. The arc extinguishing system according to claim 1, characterized in that: In a projection diagram along the axial direction of the conductive coil (21), the movement path of the arc-moving contact (121) is at least partially located within the inner ring range of the conductive coil (21).

3. The arc extinguishing system according to claim 2, characterized in that: in: The winding portion (211) is arranged on one side of the contact assembly (1) along the direction of the rotation axis of the arc moving contact (12); Alternatively, one end of the winding portion (211) along its own axial direction is arranged opposite to the movable end of the arc moving contact (12).

4. The arc extinguishing system according to claim 3, characterized in that: The number of the arc striking assemblies (2) is two, and the two arc striking assemblies (2) are respectively arranged on opposite sides of the contact assembly (1) along the direction of the rotation axis of the arc moving contact (12).

5. The arc extinguishing system according to claim 3, characterized in that: The cross-sectional outer contour of the conductive coil (21) is polygonal; 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) being respectively located on opposite sides of the electric arc in a radial direction; and the currents in the first straight line segment (2111) and the second straight line segment (2112) are in opposite directions.

6. The arc extinguishing system according to claim 3, characterized in that: The winding portion (211) is arranged on one side of the contact assembly (1) along the rotation axis direction of the arc moving contact (12), and 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 a spiral in a counterclockwise direction and is connected to the arc static contact (14).

7. The arc extinguishing system according to claim 3, characterized in that: One end of the winding portion (211) along its own axial direction is arranged opposite to the movable end of the arc moving contact (12), the arc moving contact (12) is located on one side of the active 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 spiral clockwise direction and is connected to the arc static contact (14).

8. The arc extinguishing system according to claim 1, characterized in that: The arc striking assembly (2) comprises one or more conductive coils (21), each conductive coil (21) being arranged on a 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 of the conductive coils (21) is connected to the main static contact (13), and the other end spirally extends in a clockwise direction and is connected to the arc static contact (14).

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

10. The arc extinguishing system according to claim 9, characterized in that: The shell bottom of the mounting shell (22) is provided with at least one group of slot groups (221) distributed along the circumference of the mounting shell (22), and each group of the slot groups (221) includes at least one slot; the winding portion (211) is snap-fitted with the slot groups (221).

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

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

14. The arc extinguishing system according to any one of claims 1 to 8, characterized in that: It also comprises an arc extinguishing chamber (3), wherein the arc extinguishing chamber (3) comprises a grid plate group (31); the conductive coil (21) can form a magnetic field force that drives the arc to move from the contact assembly (1) to the arc extinguishing chamber (3).

15. The arc extinguishing system according to claim 14, characterized in that: The mounting shell (22) has an opening, and the arc striking assembly (2) further comprises a cover plate (23) covering the opening of the mounting shell (22), the cover plate (23) being provided with through holes for allowing the two connecting parts (212) to pass through; the cover plate (23) is connected to one side of the grid plate group (31).

16. The arc extinguishing system according to claim 14, characterized in that: The arc extinguishing chamber (3) further comprises a movable arc-striking piece (32) and a static arc-striking piece (33) respectively arranged at two ends of the grid piece group (31); a middle portion of the movable arc-striking piece (32) adjacent to the arc extinguishing chamber is recessed toward the static arc-striking piece (33) to form a V-shaped protrusion, and a middle portion of the static arc-striking piece (33) adjacent to the arc extinguishing chamber is recessed toward the movable arc-striking piece (32) to form a V-shaped protrusion, and the tips of the two V-shaped protrusions are arranged opposite to each other.

17. The arc extinguishing system according to any one of claims 1 to 8, characterized in that: The cross-sectional outer contour of the conductive coil (21) is circular, elliptical or polygonal.

18. A circuit breaker, characterized in that: Comprising the arc extinguishing system according to any one of claims 1 to 17.

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